[Git][debian-gis-team/trollimage][upstream] New upstream version 1.6.3

Antonio Valentino gitlab at salsa.debian.org
Tue Dec 25 12:00:51 GMT 2018


Antonio Valentino pushed to branch upstream at Debian GIS Project / trollimage


Commits:
a90c409f by Antonio Valentino at 2018-12-25T11:46:57Z
New upstream version 1.6.3
- - - - -


17 changed files:

- + .gitattributes
- .stickler.yml
- + CHANGELOG.md
- MANIFEST.in
- + RELEASING.md
- doc/colorspaces.rst
- doc/image.rst
- doc/index.rst
- doc/xrimage.rst
- + rtd_requirements.txt
- setup.cfg
- setup.py
- trollimage/__init__.py
- trollimage/tests/test_image.py
- trollimage/version.py
- trollimage/xrimage.py
- + versioneer.py


Changes:

=====================================
.gitattributes
=====================================
@@ -0,0 +1 @@
+trollimage/version.py export-subst


=====================================
.stickler.yml
=====================================
@@ -1,5 +1,4 @@
 linters:
   flake8:
-    fixer: true
-fixers:
-  enable: true
+    python: 3
+    config: setup.cfg


=====================================
CHANGELOG.md
=====================================
@@ -0,0 +1,61 @@
+## Version 1.6.3 (2018/12/20)
+
+
+### Pull Requests Merged
+
+#### Bugs fixed
+
+* [PR 38](https://github.com/pytroll/trollimage/pull/38) - Fix casting and scaling float arrays in finalize
+
+In this release 1 pull request was closed.
+
+
+## Version 1.6.2 (2018/12/20)
+
+
+### Pull Requests Merged
+
+#### Bugs fixed
+
+* [PR 37](https://github.com/pytroll/trollimage/pull/37) - Fix and cleanup alpha and fill value handling in XRImage finalize
+* [PR 35](https://github.com/pytroll/trollimage/pull/35) - Fix xrimage alpha creation in finalize
+
+In this release 2 pull requests were closed.
+
+
+## Version 1.6.1 (2018/12/19)
+
+
+### Pull Requests Merged
+
+#### Bugs fixed
+
+* [PR 34](https://github.com/pytroll/trollimage/pull/34) - Fix XRImage's finalize method when input data are integers
+
+In this release 1 pull request was closed.
+
+
+## Version 1.6.0 (2018/12/18)
+
+### Issues Closed
+
+* [Issue 30](https://github.com/pytroll/trollimage/issues/30) - ReadTheDoc page builds not up to date ([PR 32](https://github.com/pytroll/trollimage/pull/32))
+* [Issue 21](https://github.com/pytroll/trollimage/issues/21) - Add 'convert' method to XRImage
+
+In this release 2 issues were closed.
+
+### Pull Requests Merged
+
+#### Bugs fixed
+
+* [PR 33](https://github.com/pytroll/trollimage/pull/33) - Fix crude stretch not calculating min/max per-band
+
+#### Features added
+
+* [PR 28](https://github.com/pytroll/trollimage/pull/28) - Add convert method of XRImage
+
+In this release 2 pull requests were closed.
+
+## Previous Versions
+
+See changelog.rst for previous release notes.


=====================================
MANIFEST.in
=====================================
@@ -1,2 +1,4 @@
 include LICENSE.txt
 include README.rst
+include versioneer.py
+include trollimage/version.py


=====================================
RELEASING.md
=====================================
@@ -0,0 +1,23 @@
+# Releasing trollimage
+
+1. checkout master
+2. pull from repo
+3. run the unittests
+4. run `loghub` and update the `CHANGELOG.md` file:
+
+```
+loghub pytroll/trollimage -u <username> -st v0.8.0 -plg bug "Bugs fixed" -plg enhancement "Features added" -plg documentation "Documentation changes" -plg backwards-incompatibility "Backwards incompatible changes"
+```
+
+Don't forget to commit!
+
+5. Create a tag with the new version number, starting with a 'v', eg:
+
+```
+git tag -a v0.22.45 -m "Version 0.22.45"
+```
+
+See [semver.org](http://semver.org/) on how to write a version number.
+
+6. push changes to github `git push --follow-tags`
+7. Verify travis tests passed and deployed sdist and wheel to PyPI


=====================================
doc/colorspaces.rst
=====================================
@@ -1,5 +1,6 @@
+===========
 Colorspaces
------------
+===========
 
 .. automodule:: trollimage.colorspaces
    :members:


=====================================
doc/image.rst
=====================================
@@ -1,5 +1,6 @@
+=============
 Simple images
--------------
+=============
 
 .. automodule:: trollimage.image
    :members:


=====================================
doc/index.rst
=====================================
@@ -23,7 +23,6 @@ Contents:
    colormap
 
 
-
 Indices and tables
 ==================
 


=====================================
doc/xrimage.rst
=====================================
@@ -1,6 +1,8 @@
-Simple images
--------------
+=============
+XArray images
+=============
 
-.. automodule:: trollimage.xrimage
-   :members:
-   :undoc-members:
+.. autoclass:: trollimage.xrimage.XRImage
+  :members:
+  :special-members:
+  :exclude-members: __dict__,__weakref__


=====================================
rtd_requirements.txt
=====================================
@@ -0,0 +1,5 @@
+pillow
+six
+rasterio
+xarray
+dask[array]
\ No newline at end of file


=====================================
setup.cfg
=====================================
@@ -2,4 +2,20 @@
 requires=numpy python-pillow
 release=1
 
+[bdist_wheel]
+universal=1
 
+[flake8]
+max-line-length = 120
+
+[versioneer]
+VCS = git
+style = pep440
+versionfile_source = trollimage/version.py
+versionfile_build =
+tag_prefix = v
+
+[coverage:run]
+omit =
+    trollimage/version.py
+    versioneer.py


=====================================
setup.py
=====================================
@@ -26,12 +26,11 @@
 """
 
 from setuptools import setup
-import imp
-
-version = imp.load_source('trollimage.version', 'trollimage/version.py')
+import versioneer
 
 setup(name="trollimage",
-      version=version.__version__,
+      version=versioneer.get_version(),
+      cmdclass=versioneer.get_cmdclass(),
       description='Pytroll imaging library',
       author='Martin Raspaud',
       author_email='martin.raspaud at smhi.se',
@@ -45,7 +44,7 @@ setup(name="trollimage",
       url="https://github.com/pytroll/trollimage",
       packages=['trollimage'],
       zip_safe=False,
-      install_requires=['numpy >=1.6', 'pillow', 'six'],
+      install_requires=['numpy >=1.13', 'pillow', 'six'],
       extras_require={
           'geotiff': ['rasterio'],
           'xarray': ['xarray', 'dask[array]'],


=====================================
trollimage/__init__.py
=====================================
@@ -23,4 +23,6 @@
 """The trollimage package
 """
 
-from trollimage.version import __version__  # noqa
+from .version import get_versions
+__version__ = get_versions()['version']
+del get_versions


=====================================
trollimage/tests/test_image.py
=====================================
@@ -40,6 +40,23 @@ except ImportError:
 EPSILON = 0.0001
 
 
+class CustomScheduler(object):
+    """Custom dask scheduler that raises an exception if dask is computed too many times."""
+
+    def __init__(self, max_computes=1):
+        """Set starting and maximum compute counts."""
+        self.max_computes = max_computes
+        self.total_computes = 0
+
+    def __call__(self, dsk, keys, **kwargs):
+        """Compute dask task and keep track of number of times we do so."""
+        import dask
+        self.total_computes += 1
+        if self.total_computes > self.max_computes:
+            raise RuntimeError("Too many dask computations were scheduled: {}".format(self.total_computes))
+        return dask.get(dsk, keys, **kwargs)
+
+
 class TestEmptyImage(unittest.TestCase):
 
     """Class for testing the mpop.imageo.image module
@@ -573,7 +590,7 @@ class TestRegularImage(unittest.TestCase):
 
         self.img.convert(oldmode)
 
-    @unittest.skipIf('win' in sys.platform,
+    @unittest.skipIf(sys.platform.startswith('win'),
                      "Read-only tmp dir not working under Windows")
     def test_save(self):
         """Save an image.
@@ -597,7 +614,7 @@ class TestRegularImage(unittest.TestCase):
 
         self.img.convert(oldmode)
 
-    @unittest.skipIf('win' in sys.platform,
+    @unittest.skipIf(sys.platform.startswith('win'),
                      "Read-only tmp dir not working under Windows")
     def test_save_jpeg(self):
         """Save a jpeg image.
@@ -781,7 +798,7 @@ class TestXRImage(unittest.TestCase):
         img = xrimage.XRImage(data)
         self.assertEqual(img.mode, 'YCbCrA')
 
-    @unittest.skipIf('win' in sys.platform,
+    @unittest.skipIf(sys.platform.startswith('win'),
                      "'NamedTemporaryFile' not supported on Windows")
     def test_save(self):
         import xarray as xr
@@ -826,30 +843,197 @@ class TestXRImage(unittest.TestCase):
             self.assertIsInstance(delay, Delayed)
             delay.compute()
 
-    @unittest.skipIf('win' in sys.platform,
-                     "'NamedTemporaryFile' not supported on Windows")
-    def test_save_geotiff(self):
+    @unittest.skipIf(sys.platform.startswith('win'), "'NamedTemporaryFile' not supported on Windows")
+    def test_save_geotiff_float(self):
+        """Test saving geotiffs when input data is float."""
         import xarray as xr
         import dask.array as da
         from trollimage import xrimage
+        import rasterio as rio
 
-        data = xr.DataArray(np.arange(75).reshape(5, 5, 3) / 75., dims=[
+        # numpy array image - scale to 0 to 1 first
+        data = xr.DataArray(np.arange(75.).reshape(5, 5, 3) / 75., dims=[
             'y', 'x', 'bands'], coords={'bands': ['R', 'G', 'B']})
         img = xrimage.XRImage(data)
         with NamedTemporaryFile(suffix='.tif') as tmp:
             img.save(tmp.name)
-
-        data = xr.DataArray(da.from_array(np.arange(75).reshape(5, 5, 3) / 75.,
-                                          chunks=5),
+            with rio.open(tmp.name) as f:
+                file_data = f.read()
+            self.assertEqual(file_data.shape, (4, 5, 5))  # alpha band added
+            exp = (np.arange(75.).reshape(5, 5, 3) / 75. * 255).round()
+            np.testing.assert_allclose(file_data[0], exp[:, :, 0])
+            np.testing.assert_allclose(file_data[1], exp[:, :, 1])
+            np.testing.assert_allclose(file_data[2], exp[:, :, 2])
+            np.testing.assert_allclose(file_data[3], 255)  # completely opaque
+
+        data = xr.DataArray(da.from_array(np.arange(75.).reshape(5, 5, 3) / 75., chunks=5),
                             dims=['y', 'x', 'bands'],
                             coords={'bands': ['R', 'G', 'B']})
         img = xrimage.XRImage(data)
+        # Regular default save
         with NamedTemporaryFile(suffix='.tif') as tmp:
             img.save(tmp.name)
-        data = data.where(data > (10 / 75.0))
+            with rio.open(tmp.name) as f:
+                file_data = f.read()
+            self.assertEqual(file_data.shape, (4, 5, 5))  # alpha band added
+            exp = (np.arange(75.).reshape(5, 5, 3) / 75. * 255).round()
+            np.testing.assert_allclose(file_data[0], exp[:, :, 0])
+            np.testing.assert_allclose(file_data[1], exp[:, :, 1])
+            np.testing.assert_allclose(file_data[2], exp[:, :, 2])
+            np.testing.assert_allclose(file_data[3], 255)  # completely opaque
+
+        # with NaNs
+        data = data.where(data > 10. / 75.)
+        img = xrimage.XRImage(data)
+        with NamedTemporaryFile(suffix='.tif') as tmp:
+            img.save(tmp.name)
+            with rio.open(tmp.name) as f:
+                file_data = f.read()
+            self.assertEqual(file_data.shape, (4, 5, 5))  # alpha band added
+            exp = np.arange(75.).reshape(5, 5, 3) / 75.
+            exp[exp <= 10. / 75.] = 0  # numpy converts NaNs to 0s
+            exp = (exp * 255).round()
+            np.testing.assert_allclose(file_data[0], exp[:, :, 0])
+            np.testing.assert_allclose(file_data[1], exp[:, :, 1])
+            np.testing.assert_allclose(file_data[2], exp[:, :, 2])
+            is_null = (exp == 0).all(axis=2)
+            np.testing.assert_allclose(file_data[3][~is_null], 255)  # completely opaque
+            np.testing.assert_allclose(file_data[3][is_null], 0)  # completely transparent
+
+        # with fill value
+        with NamedTemporaryFile(suffix='.tif') as tmp:
+            img.save(tmp.name, fill_value=128)
+            with rio.open(tmp.name) as f:
+                file_data = f.read()
+            self.assertEqual(file_data.shape, (3, 5, 5))  # no alpha band
+            exp = np.arange(75.).reshape(5, 5, 3) / 75.
+            exp2 = (exp * 255).round()
+            exp2[exp <= 10. / 75.] = 128
+            np.testing.assert_allclose(file_data[0], exp2[:, :, 0])
+            np.testing.assert_allclose(file_data[1], exp2[:, :, 1])
+            np.testing.assert_allclose(file_data[2], exp2[:, :, 2])
+
+        # float type - floats can't have alpha channel
+        with NamedTemporaryFile(suffix='.tif') as tmp:
+            img.save(tmp.name, dtype=np.float32)
+            with rio.open(tmp.name) as f:
+                file_data = f.read()
+            self.assertEqual(file_data.shape, (3, 5, 5))  # no alpha band
+            exp = np.arange(75.).reshape(5, 5, 3) / 75.
+            # fill value is forced to 0
+            exp[exp <= 10. / 75.] = 0
+            np.testing.assert_allclose(file_data[0], exp[:, :, 0])
+            np.testing.assert_allclose(file_data[1], exp[:, :, 1])
+            np.testing.assert_allclose(file_data[2], exp[:, :, 2])
+
+        # float type with NaN fill value
+        with NamedTemporaryFile(suffix='.tif') as tmp:
+            img.save(tmp.name, dtype=np.float32, fill_value=np.nan)
+            with rio.open(tmp.name) as f:
+                file_data = f.read()
+            self.assertEqual(file_data.shape, (3, 5, 5))  # no alpha band
+            exp = np.arange(75.).reshape(5, 5, 3) / 75.
+            exp[exp <= 10. / 75.] = np.nan
+            np.testing.assert_allclose(file_data[0], exp[:, :, 0])
+            np.testing.assert_allclose(file_data[1], exp[:, :, 1])
+            np.testing.assert_allclose(file_data[2], exp[:, :, 2])
+
+        # float type with non-NaN fill value
+        with NamedTemporaryFile(suffix='.tif') as tmp:
+            img.save(tmp.name, dtype=np.float32, fill_value=128)
+            with rio.open(tmp.name) as f:
+                file_data = f.read()
+            self.assertEqual(file_data.shape, (3, 5, 5))  # no alpha band
+            exp = np.arange(75.).reshape(5, 5, 3) / 75.
+            exp[exp <= 10. / 75.] = 128
+            np.testing.assert_allclose(file_data[0], exp[:, :, 0])
+            np.testing.assert_allclose(file_data[1], exp[:, :, 1])
+            np.testing.assert_allclose(file_data[2], exp[:, :, 2])
+
+        # float input with fill value saved to int16 (signed!)
+        with NamedTemporaryFile(suffix='.tif') as tmp:
+            img.save(tmp.name, dtype=np.int16, fill_value=-128)
+            with rio.open(tmp.name) as f:
+                file_data = f.read()
+            self.assertEqual(file_data.shape, (3, 5, 5))  # no alpha band
+            exp = np.arange(75.).reshape(5, 5, 3) / 75.
+            exp2 = (exp * (2**16 - 1) - (2**15)).round()
+            exp2[exp <= 10. / 75.] = -128.
+            np.testing.assert_allclose(file_data[0], exp2[:, :, 0])
+            np.testing.assert_allclose(file_data[1], exp2[:, :, 1])
+            np.testing.assert_allclose(file_data[2], exp2[:, :, 2])
+
+        # dask delayed save
+        with NamedTemporaryFile(suffix='.tif') as tmp:
+            delay = img.save(tmp.name, compute=False)
+            self.assertIsInstance(delay, tuple)
+            self.assertIsInstance(delay[0], da.Array)
+            self.assertIsInstance(delay[1], xrimage.RIOFile)
+            da.store(*delay)
+            delay[1].close()
+
+        # float RGBA input to uint8
+        alpha = xr.ones_like(data[:, :, 0])
+        alpha = alpha.where(data.notnull().all(dim='bands'), 0)
+        alpha['bands'] = 'A'
+        # make a float version of a uint8 RGBA
+        rgb_data = xr.concat((data, alpha), dim='bands')
+        img = xrimage.XRImage(rgb_data)
+        with NamedTemporaryFile(suffix='.tif') as tmp:
+            img.save(tmp.name)
+            with rio.open(tmp.name) as f:
+                file_data = f.read()
+            self.assertEqual(file_data.shape, (4, 5, 5))  # alpha band already existed
+            exp = np.arange(75.).reshape(5, 5, 3) / 75.
+            exp[exp <= 10. / 75.] = 0  # numpy converts NaNs to 0s
+            exp = (exp * 255.).round()
+            np.testing.assert_allclose(file_data[0], exp[:, :, 0])
+            np.testing.assert_allclose(file_data[1], exp[:, :, 1])
+            np.testing.assert_allclose(file_data[2], exp[:, :, 2])
+            not_null = (alpha != 0).values
+            np.testing.assert_allclose(file_data[3][not_null], 255)  # completely opaque
+            np.testing.assert_allclose(file_data[3][~not_null], 0)  # completely transparent
+
+    @unittest.skipIf(sys.platform.startswith('win'), "'NamedTemporaryFile' not supported on Windows")
+    def test_save_geotiff_int(self):
+        """Test saving geotiffs when input data is int."""
+        import xarray as xr
+        import dask.array as da
+        from trollimage import xrimage
+        import rasterio as rio
+
+        # numpy array image
+        data = xr.DataArray(np.arange(75).reshape(5, 5, 3), dims=[
+            'y', 'x', 'bands'], coords={'bands': ['R', 'G', 'B']})
         img = xrimage.XRImage(data)
+        self.assertTrue(np.issubdtype(img.data.dtype, np.integer))
         with NamedTemporaryFile(suffix='.tif') as tmp:
             img.save(tmp.name)
+            with rio.open(tmp.name) as f:
+                file_data = f.read()
+            self.assertEqual(file_data.shape, (4, 5, 5))  # alpha band added
+            exp = np.arange(75).reshape(5, 5, 3)
+            np.testing.assert_allclose(file_data[0], exp[:, :, 0])
+            np.testing.assert_allclose(file_data[1], exp[:, :, 1])
+            np.testing.assert_allclose(file_data[2], exp[:, :, 2])
+            np.testing.assert_allclose(file_data[3], 255)
+
+        data = xr.DataArray(da.from_array(np.arange(75).reshape(5, 5, 3), chunks=5),
+                            dims=['y', 'x', 'bands'],
+                            coords={'bands': ['R', 'G', 'B']})
+        img = xrimage.XRImage(data)
+        self.assertTrue(np.issubdtype(img.data.dtype, np.integer))
+        # Regular default save
+        with NamedTemporaryFile(suffix='.tif') as tmp:
+            img.save(tmp.name)
+            with rio.open(tmp.name) as f:
+                file_data = f.read()
+            self.assertEqual(file_data.shape, (4, 5, 5))  # alpha band added
+            exp = np.arange(75).reshape(5, 5, 3)
+            np.testing.assert_allclose(file_data[0], exp[:, :, 0])
+            np.testing.assert_allclose(file_data[1], exp[:, :, 1])
+            np.testing.assert_allclose(file_data[2], exp[:, :, 2])
+            np.testing.assert_allclose(file_data[3], 255)
 
         # dask delayed save
         with NamedTemporaryFile(suffix='.tif') as tmp:
@@ -860,6 +1044,46 @@ class TestXRImage(unittest.TestCase):
             da.store(*delay)
             delay[1].close()
 
+        # with input fill value
+        data = np.arange(75).reshape(5, 5, 3)
+        # second pixel is all bad
+        # pixel [0, 1, 1] is also naturally 5 by arange above
+        data[0, 1, :] = 5
+        data = xr.DataArray(da.from_array(data, chunks=5),
+                            dims=['y', 'x', 'bands'],
+                            attrs={'_FillValue': 5},
+                            coords={'bands': ['R', 'G', 'B']})
+        img = xrimage.XRImage(data)
+        self.assertTrue(np.issubdtype(img.data.dtype, np.integer))
+        with NamedTemporaryFile(suffix='.tif') as tmp:
+            img.save(tmp.name, fill_value=128)
+            with rio.open(tmp.name) as f:
+                file_data = f.read()
+            self.assertEqual(file_data.shape, (3, 5, 5))  # no alpha band
+            exp = np.arange(75).reshape(5, 5, 3)
+            exp[0, 1, :] = 128
+            exp[0, 1, 1] = 128
+            np.testing.assert_allclose(file_data[0], exp[:, :, 0])
+            np.testing.assert_allclose(file_data[1], exp[:, :, 1])
+            np.testing.assert_allclose(file_data[2], exp[:, :, 2])
+
+        # input fill value but alpha on output
+        with NamedTemporaryFile(suffix='.tif') as tmp:
+            img.save(tmp.name)
+            with rio.open(tmp.name) as f:
+                file_data = f.read()
+            self.assertEqual(file_data.shape, (4, 5, 5))  # no alpha band
+            exp = np.arange(75).reshape(5, 5, 3)
+            exp[0, 1, :] = 5
+            exp[0, 1, 1] = 5
+            exp_alpha = np.ones((5, 5)) * 255
+            exp_alpha[0, 1] = 0
+            np.testing.assert_allclose(file_data[0], exp[:, :, 0])
+            np.testing.assert_allclose(file_data[1], exp[:, :, 1])
+            np.testing.assert_allclose(file_data[2], exp[:, :, 2])
+            np.testing.assert_allclose(file_data[3], exp_alpha)
+
+
     def test_gamma(self):
         """Test gamma correction."""
         import xarray as xr
@@ -880,19 +1104,24 @@ class TestXRImage(unittest.TestCase):
         import xarray as xr
         from trollimage import xrimage
 
-        arr = np.arange(75).reshape(5, 5, 3) / 74.
+        arr = np.arange(75).reshape(5, 5, 3)
         data = xr.DataArray(arr.copy(), dims=['y', 'x', 'bands'],
                             coords={'bands': ['R', 'G', 'B']})
         img = xrimage.XRImage(data)
         img.crude_stretch()
-        self.assertTrue(np.allclose(img.data.values, arr))
+        red = img.data.sel(bands='R')
+        green = img.data.sel(bands='G')
+        blue = img.data.sel(bands='B')
+        np.testing.assert_allclose(red, arr[:, :, 0] / 72.)
+        np.testing.assert_allclose(green, (arr[:, :, 1] - 1.) / (73. - 1.))
+        np.testing.assert_allclose(blue, (arr[:, :, 2] - 2.) / (74. - 2.))
 
         arr = np.arange(75).reshape(5, 5, 3).astype(float)
         data = xr.DataArray(arr.copy(), dims=['y', 'x', 'bands'],
                             coords={'bands': ['R', 'G', 'B']})
         img = xrimage.XRImage(data)
         img.crude_stretch(0, 74)
-        self.assertTrue(np.allclose(img.data.values, arr / 74.))
+        np.testing.assert_allclose(img.data.values, arr / 74.)
 
     def test_invert(self):
         """Check inversion of the image."""
@@ -1103,7 +1332,120 @@ class TestXRImage(unittest.TestCase):
         pass
 
     def test_convert_modes(self):
-        pass
+        import dask
+        import xarray as xr
+        from trollimage import xrimage
+        from trollimage.colormap import brbg
+
+        arr1 = np.arange(150).reshape(1, 15, 10) / 150.
+        arr2 = np.append(arr1, np.ones(150).reshape(arr1.shape)).reshape(2, 15, 10)
+        arr3 = (np.arange(150).reshape(2, 15, 5) / 15).astype('int64')
+        dataset1 = xr.DataArray(arr1.copy(), dims=['bands', 'y', 'x'],
+                                coords={'bands': ['L']})
+        dataset2 = xr.DataArray(arr2.copy(), dims=['bands', 'x', 'y'],
+                                coords={'bands': ['L', 'A']})
+        dataset3 = xr.DataArray(arr3.copy(), dims=['bands', 'x', 'y'],
+                                coords={'bands': ['P', 'A']})
+
+        img = xrimage.XRImage(dataset1)
+        new_img = img.convert(img.mode)
+        self.assertIsNotNone(new_img)
+        # make sure it is a copy
+        self.assertIsNot(new_img, img)
+        self.assertIsNot(new_img.data, img.data)
+
+        # L -> LA (int)
+        with dask.config.set(scheduler=CustomScheduler(max_computes=1)):
+            img = xrimage.XRImage((dataset1 * 150).astype(np.uint8))
+            img = img.convert('LA')
+            self.assertTrue(np.issubdtype(img.data.dtype, np.integer))
+            self.assertTrue(img.mode == 'LA')
+            self.assertTrue(len(img.data.coords['bands']) == 2)
+            # make sure the alpha band is all opaque
+            np.testing.assert_allclose(img.data.sel(bands='A'), 255)
+
+        # L -> LA (float)
+        with dask.config.set(scheduler=CustomScheduler(max_computes=1)):
+            img = xrimage.XRImage(dataset1)
+            img = img.convert('LA')
+            self.assertTrue(img.mode == 'LA')
+            self.assertTrue(len(img.data.coords['bands']) == 2)
+            # make sure the alpha band is all opaque
+            np.testing.assert_allclose(img.data.sel(bands='A'), 1.)
+
+        # LA -> L (float)
+        with dask.config.set(scheduler=CustomScheduler(max_computes=0)):
+            img = img.convert('L')
+            self.assertTrue(img.mode == 'L')
+            self.assertTrue(len(img.data.coords['bands']) == 1)
+
+        # L -> RGB (float)
+        with dask.config.set(scheduler=CustomScheduler(max_computes=1)):
+            img = img.convert('RGB')
+            self.assertTrue(img.mode == 'RGB')
+            self.assertTrue(len(img.data.coords['bands']) == 3)
+            data = img.data.compute()
+            np.testing.assert_allclose(data.sel(bands=['R']), arr1)
+            np.testing.assert_allclose(data.sel(bands=['G']), arr1)
+            np.testing.assert_allclose(data.sel(bands=['B']), arr1)
+
+        # RGB -> RGBA (float)
+        with dask.config.set(scheduler=CustomScheduler(max_computes=1)):
+            img = img.convert('RGBA')
+            self.assertTrue(img.mode == 'RGBA')
+            self.assertTrue(len(img.data.coords['bands']) == 4)
+            self.assertTrue(np.issubdtype(img.data.dtype, np.floating))
+            data = img.data.compute()
+            np.testing.assert_allclose(data.sel(bands=['R']), arr1)
+            np.testing.assert_allclose(data.sel(bands=['G']), arr1)
+            np.testing.assert_allclose(data.sel(bands=['B']), arr1)
+            # make sure the alpha band is all opaque
+            np.testing.assert_allclose(data.sel(bands='A'), 1.)
+
+        # RGB -> RGBA (int)
+        with dask.config.set(scheduler=CustomScheduler(max_computes=1)):
+            img = xrimage.XRImage((dataset1 * 150).astype(np.uint8))
+            img = img.convert('RGB')  # L -> RGB
+            self.assertTrue(np.issubdtype(img.data.dtype, np.integer))
+            img = img.convert('RGBA')
+            self.assertTrue(img.mode == 'RGBA')
+            self.assertTrue(len(img.data.coords['bands']) == 4)
+            self.assertTrue(np.issubdtype(img.data.dtype, np.integer))
+            data = img.data.compute()
+            np.testing.assert_allclose(data.sel(bands=['R']), (arr1 * 150).astype(np.uint8))
+            np.testing.assert_allclose(data.sel(bands=['G']), (arr1 * 150).astype(np.uint8))
+            np.testing.assert_allclose(data.sel(bands=['B']), (arr1 * 150).astype(np.uint8))
+            # make sure the alpha band is all opaque
+            np.testing.assert_allclose(data.sel(bands='A'), 255)
+
+        # LA -> RGBA (float)
+        with dask.config.set(scheduler=CustomScheduler(max_computes=0)):
+            img = xrimage.XRImage(dataset2)
+            img = img.convert('RGBA')
+            self.assertTrue(img.mode == 'RGBA')
+            self.assertTrue(len(img.data.coords['bands']) == 4)
+
+        # L -> palettize -> RGBA (float)
+        with dask.config.set(scheduler=CustomScheduler(max_computes=0)):
+            img = xrimage.XRImage(dataset1)
+            img.palettize(brbg)
+            pal = img.palette
+
+            img = img.convert('RGBA')
+            self.assertTrue(np.issubdtype(img.data.dtype, np.floating))
+            self.assertTrue(img.mode == 'RGBA')
+            self.assertTrue(len(img.data.coords['bands']) == 4)
+
+        # PA -> RGB (float)
+        img = xrimage.XRImage(dataset3)
+        img.palette = pal
+        with dask.config.set(scheduler=CustomScheduler(max_computes=0)):
+            img = img.convert('RGB')
+            self.assertTrue(np.issubdtype(img.data.dtype, np.floating))
+            self.assertTrue(img.mode == 'RGB')
+            self.assertTrue(len(img.data.coords['bands']) == 3)
+
+        self.assertRaises(ValueError, img.convert, 'A')
 
     def test_colorize(self):
         import xarray as xr
@@ -1114,87 +1456,86 @@ class TestXRImage(unittest.TestCase):
         data = xr.DataArray(arr.copy(), dims=['y', 'x'])
         img = xrimage.XRImage(data)
         img.colorize(brbg)
-
-        values = img.data.values
+        values = img.data.compute()
 
         expected = np.array([[
-            [3.29409498e-01,   3.59108764e-01,   3.88800969e-01,
-             4.18486092e-01,   4.48164112e-01,   4.77835010e-01,
-             5.07498765e-01,   5.37155355e-01,   5.65419479e-01,
-             5.92686124e-01,   6.19861622e-01,   6.46945403e-01,
-             6.73936907e-01,   7.00835579e-01,   7.27640871e-01],
-            [7.58680358e-01,   8.01695237e-01,   8.35686284e-01,
-             8.60598212e-01,   8.76625002e-01,   8.84194741e-01,
-             8.83948647e-01,   8.76714923e-01,   8.95016030e-01,
-             9.14039881e-01,   9.27287161e-01,   9.36546985e-01,
-             9.43656076e-01,   9.50421050e-01,   9.58544227e-01],
-            [9.86916929e-01,   1.02423117e+00,   1.03591220e+00,
-             1.02666645e+00,   1.00491333e+00,   9.80759775e-01,
-             9.63746819e-01,   9.60798629e-01,   9.47739946e-01,
-             9.27428067e-01,   9.01184523e-01,   8.71168132e-01,
-             8.40161241e-01,   8.11290344e-01,   7.87705814e-01],
-            [7.57749840e-01,   7.20020026e-01,   6.82329616e-01,
-             6.44678929e-01,   6.07068282e-01,   5.69497990e-01,
-             5.31968369e-01,   4.94025422e-01,   4.54275131e-01,
-             4.14517560e-01,   3.74757709e-01,   3.35000583e-01,
-             2.95251189e-01,   2.55514533e-01,   2.15795621e-01],
-            [1.85805611e-01,   1.58245609e-01,   1.30686714e-01,
-             1.03128926e-01,   7.55722460e-02,   4.80166757e-02,
-             2.04622160e-02,   3.79809920e-03,   3.46310306e-03,
-             3.10070529e-03,   2.68579661e-03,   2.19341216e-03,
-             1.59875239e-03,   8.77203803e-04,   4.35952940e-06]],
-
-            [[1.88249866e-01,   2.05728128e-01,   2.23209861e-01,
-              2.40695072e-01,   2.58183766e-01,   2.75675949e-01,
-              2.93171625e-01,   3.10670801e-01,   3.32877903e-01,
-              3.58244116e-01,   3.83638063e-01,   4.09059827e-01,
-              4.34509485e-01,   4.59987117e-01,   4.85492795e-01],
-             [5.04317660e-01,   4.97523483e-01,   4.92879482e-01,
-              4.90522941e-01,   4.90521579e-01,   4.92874471e-01,
-              4.97514769e-01,   5.04314130e-01,   5.48356836e-01,
-              6.02679755e-01,   6.57930117e-01,   7.13582394e-01,
-              7.69129132e-01,   8.24101035e-01,   8.78084923e-01],
-             [9.05957986e-01,   9.00459829e-01,   9.01710827e-01,
-              9.09304816e-01,   9.21567297e-01,   9.36002510e-01,
-              9.49878533e-01,   9.60836244e-01,   9.50521017e-01,
-              9.42321192e-01,   9.36098294e-01,   9.31447978e-01,
-              9.27737112e-01,   9.24164130e-01,   9.19837458e-01],
-             [9.08479555e-01,   8.93119640e-01,   8.77756168e-01,
-              8.62389039e-01,   8.47018155e-01,   8.31643415e-01,
-              8.16264720e-01,   7.98248733e-01,   7.69688456e-01,
-              7.41111049e-01,   7.12515170e-01,   6.83899486e-01,
-              6.55262669e-01,   6.26603399e-01,   5.97920364e-01],
-             [5.71406981e-01,   5.45439361e-01,   5.19471340e-01,
-              4.93502919e-01,   4.67534097e-01,   4.41564875e-01,
-              4.15595252e-01,   3.91172349e-01,   3.69029170e-01,
-              3.46833147e-01,   3.24591169e-01,   3.02310146e-01,
-              2.79997004e-01,   2.57658679e-01,   2.35302110e-01]],
-
-            [[1.96102817e-02,   2.23037080e-02,   2.49835320e-02,
-              2.76497605e-02,   3.03024001e-02,   3.29414575e-02,
-              3.55669395e-02,   3.81788529e-02,   5.03598778e-02,
-              6.89209657e-02,   8.74757090e-02,   1.06024973e-01,
-              1.24569626e-01,   1.43110536e-01,   1.61648577e-01],
-             [1.82340027e-01,   2.15315774e-01,   2.53562955e-01,
-              2.95884521e-01,   3.41038527e-01,   3.87773687e-01,
-              4.34864157e-01,   4.81142673e-01,   5.00410360e-01,
-              5.19991397e-01,   5.47394263e-01,   5.82556639e-01,
-              6.25097005e-01,   6.74344521e-01,   7.29379582e-01],
-             [7.75227971e-01,   8.13001048e-01,   8.59395545e-01,
-              9.04577146e-01,   9.40342288e-01,   9.61653621e-01,
-              9.67479211e-01,   9.60799542e-01,   9.63421077e-01,
-              9.66445062e-01,   9.67352042e-01,   9.63790783e-01,
-              9.53840372e-01,   9.36234978e-01,   9.10530024e-01],
-             [8.86771441e-01,   8.67903107e-01,   8.48953980e-01,
-              8.29924111e-01,   8.10813555e-01,   7.91622365e-01,
-              7.72350598e-01,   7.51439565e-01,   7.24376642e-01,
-              6.97504841e-01,   6.70822717e-01,   6.44328750e-01,
-              6.18021348e-01,   5.91898843e-01,   5.65959492e-01],
-             [5.40017537e-01,   5.14048293e-01,   4.88079755e-01,
-              4.62111921e-01,   4.36144791e-01,   4.10178361e-01,
-              3.84212632e-01,   3.58028450e-01,   3.31935148e-01,
-              3.06445966e-01,   2.81566598e-01,   2.57302099e-01,
-              2.33656886e-01,   2.10634733e-01,   1.88238767e-01]]])
+           [3.29409498e-01,   3.59108764e-01,   3.88800969e-01,
+            4.18486092e-01,   4.48164112e-01,   4.77835010e-01,
+            5.07498765e-01,   5.37155355e-01,   5.65419479e-01,
+            5.92686124e-01,   6.19861622e-01,   6.46945403e-01,
+            6.73936907e-01,   7.00835579e-01,   7.27640871e-01],
+           [7.58680358e-01,   8.01695237e-01,   8.35686284e-01,
+            8.60598212e-01,   8.76625002e-01,   8.84194741e-01,
+            8.83948647e-01,   8.76714923e-01,   8.95016030e-01,
+            9.14039881e-01,   9.27287161e-01,   9.36546985e-01,
+            9.43656076e-01,   9.50421050e-01,   9.58544227e-01],
+           [9.86916929e-01,   1.02423117e+00,   1.03591220e+00,
+            1.02666645e+00,   1.00491333e+00,   9.80759775e-01,
+            9.63746819e-01,   9.60798629e-01,   9.47739946e-01,
+            9.27428067e-01,   9.01184523e-01,   8.71168132e-01,
+            8.40161241e-01,   8.11290344e-01,   7.87705814e-01],
+           [7.57749840e-01,   7.20020026e-01,   6.82329616e-01,
+            6.44678929e-01,   6.07068282e-01,   5.69497990e-01,
+            5.31968369e-01,   4.94025422e-01,   4.54275131e-01,
+            4.14517560e-01,   3.74757709e-01,   3.35000583e-01,
+            2.95251189e-01,   2.55514533e-01,   2.15795621e-01],
+           [1.85805611e-01,   1.58245609e-01,   1.30686714e-01,
+            1.03128926e-01,   7.55722460e-02,   4.80166757e-02,
+            2.04622160e-02,   3.79809920e-03,   3.46310306e-03,
+            3.10070529e-03,   2.68579661e-03,   2.19341216e-03,
+            1.59875239e-03,   8.77203803e-04,   4.35952940e-06]],
+
+           [[1.88249866e-01,   2.05728128e-01,   2.23209861e-01,
+             2.40695072e-01,   2.58183766e-01,   2.75675949e-01,
+             2.93171625e-01,   3.10670801e-01,   3.32877903e-01,
+             3.58244116e-01,   3.83638063e-01,   4.09059827e-01,
+             4.34509485e-01,   4.59987117e-01,   4.85492795e-01],
+            [5.04317660e-01,   4.97523483e-01,   4.92879482e-01,
+             4.90522941e-01,   4.90521579e-01,   4.92874471e-01,
+             4.97514769e-01,   5.04314130e-01,   5.48356836e-01,
+             6.02679755e-01,   6.57930117e-01,   7.13582394e-01,
+             7.69129132e-01,   8.24101035e-01,   8.78084923e-01],
+            [9.05957986e-01,   9.00459829e-01,   9.01710827e-01,
+             9.09304816e-01,   9.21567297e-01,   9.36002510e-01,
+             9.49878533e-01,   9.60836244e-01,   9.50521017e-01,
+             9.42321192e-01,   9.36098294e-01,   9.31447978e-01,
+             9.27737112e-01,   9.24164130e-01,   9.19837458e-01],
+            [9.08479555e-01,   8.93119640e-01,   8.77756168e-01,
+             8.62389039e-01,   8.47018155e-01,   8.31643415e-01,
+             8.16264720e-01,   7.98248733e-01,   7.69688456e-01,
+             7.41111049e-01,   7.12515170e-01,   6.83899486e-01,
+             6.55262669e-01,   6.26603399e-01,   5.97920364e-01],
+            [5.71406981e-01,   5.45439361e-01,   5.19471340e-01,
+             4.93502919e-01,   4.67534097e-01,   4.41564875e-01,
+             4.15595252e-01,   3.91172349e-01,   3.69029170e-01,
+             3.46833147e-01,   3.24591169e-01,   3.02310146e-01,
+             2.79997004e-01,   2.57658679e-01,   2.35302110e-01]],
+
+           [[1.96102817e-02,   2.23037080e-02,   2.49835320e-02,
+             2.76497605e-02,   3.03024001e-02,   3.29414575e-02,
+             3.55669395e-02,   3.81788529e-02,   5.03598778e-02,
+             6.89209657e-02,   8.74757090e-02,   1.06024973e-01,
+             1.24569626e-01,   1.43110536e-01,   1.61648577e-01],
+            [1.82340027e-01,   2.15315774e-01,   2.53562955e-01,
+             2.95884521e-01,   3.41038527e-01,   3.87773687e-01,
+             4.34864157e-01,   4.81142673e-01,   5.00410360e-01,
+             5.19991397e-01,   5.47394263e-01,   5.82556639e-01,
+             6.25097005e-01,   6.74344521e-01,   7.29379582e-01],
+            [7.75227971e-01,   8.13001048e-01,   8.59395545e-01,
+             9.04577146e-01,   9.40342288e-01,   9.61653621e-01,
+             9.67479211e-01,   9.60799542e-01,   9.63421077e-01,
+             9.66445062e-01,   9.67352042e-01,   9.63790783e-01,
+             9.53840372e-01,   9.36234978e-01,   9.10530024e-01],
+            [8.86771441e-01,   8.67903107e-01,   8.48953980e-01,
+             8.29924111e-01,   8.10813555e-01,   7.91622365e-01,
+             7.72350598e-01,   7.51439565e-01,   7.24376642e-01,
+             6.97504841e-01,   6.70822717e-01,   6.44328750e-01,
+             6.18021348e-01,   5.91898843e-01,   5.65959492e-01],
+            [5.40017537e-01,   5.14048293e-01,   4.88079755e-01,
+             4.62111921e-01,   4.36144791e-01,   4.10178361e-01,
+             3.84212632e-01,   3.58028450e-01,   3.31935148e-01,
+             3.06445966e-01,   2.81566598e-01,   2.57302099e-01,
+             2.33656886e-01,   2.10634733e-01,   1.88238767e-01]]])
 
         np.testing.assert_allclose(values, expected)
 
@@ -1251,8 +1592,7 @@ class TestXRImage(unittest.TestCase):
         data = xr.DataArray(np.arange(75).reshape(5, 5, 3) / 75., dims=[
             'y', 'x', 'bands'], coords={'bands': ['R', 'G', 'B']})
         img = xrimage.XRImage(data)
-        with mock.patch.object(
-                xrimage.PILImage.Image, 'save', return_value=None) as s:
+        with mock.patch.object(xrimage.PILImage.Image, 'show', return_value=None) as s:
             img.show()
             s.assert_called_once()
 


=====================================
trollimage/version.py
=====================================
@@ -1,26 +1,520 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
 
-# Copyright (c) 2013, 2014 Martin Raspaud
+# This file helps to compute a version number in source trees obtained from
+# git-archive tarball (such as those provided by githubs download-from-tag
+# feature). Distribution tarballs (built by setup.py sdist) and build
+# directories (produced by setup.py build) will contain a much shorter file
+# that just contains the computed version number.
 
-# Author(s):
+# This file is released into the public domain. Generated by
+# versioneer-0.18 (https://github.com/warner/python-versioneer)
 
-#   Martin Raspaud <martin.raspaud at smhi.se>
+"""Git implementation of _version.py."""
 
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
+import errno
+import os
+import re
+import subprocess
+import sys
 
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
 
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+def get_keywords():
+    """Get the keywords needed to look up the version information."""
+    # these strings will be replaced by git during git-archive.
+    # setup.py/versioneer.py will grep for the variable names, so they must
+    # each be defined on a line of their own. _version.py will just call
+    # get_keywords().
+    git_refnames = " (HEAD -> master, tag: v1.6.3)"
+    git_full = "69942415f7bfbd9160189534ca60782eaa2e4b59"
+    git_date = "2018-12-20 15:10:36 -0600"
+    keywords = {"refnames": git_refnames, "full": git_full, "date": git_date}
+    return keywords
 
-"""Version file.
-"""
 
-__version__ = "v1.5.7"
+class VersioneerConfig:
+    """Container for Versioneer configuration parameters."""
+
+
+def get_config():
+    """Create, populate and return the VersioneerConfig() object."""
+    # these strings are filled in when 'setup.py versioneer' creates
+    # _version.py
+    cfg = VersioneerConfig()
+    cfg.VCS = "git"
+    cfg.style = "pep440"
+    cfg.tag_prefix = "v"
+    cfg.parentdir_prefix = "None"
+    cfg.versionfile_source = "trollimage/version.py"
+    cfg.verbose = False
+    return cfg
+
+
+class NotThisMethod(Exception):
+    """Exception raised if a method is not valid for the current scenario."""
+
+
+LONG_VERSION_PY = {}
+HANDLERS = {}
+
+
+def register_vcs_handler(vcs, method):  # decorator
+    """Decorator to mark a method as the handler for a particular VCS."""
+    def decorate(f):
+        """Store f in HANDLERS[vcs][method]."""
+        if vcs not in HANDLERS:
+            HANDLERS[vcs] = {}
+        HANDLERS[vcs][method] = f
+        return f
+    return decorate
+
+
+def run_command(commands, args, cwd=None, verbose=False, hide_stderr=False,
+                env=None):
+    """Call the given command(s)."""
+    assert isinstance(commands, list)
+    p = None
+    for c in commands:
+        try:
+            dispcmd = str([c] + args)
+            # remember shell=False, so use git.cmd on windows, not just git
+            p = subprocess.Popen([c] + args, cwd=cwd, env=env,
+                                 stdout=subprocess.PIPE,
+                                 stderr=(subprocess.PIPE if hide_stderr
+                                         else None))
+            break
+        except EnvironmentError:
+            e = sys.exc_info()[1]
+            if e.errno == errno.ENOENT:
+                continue
+            if verbose:
+                print("unable to run %s" % dispcmd)
+                print(e)
+            return None, None
+    else:
+        if verbose:
+            print("unable to find command, tried %s" % (commands,))
+        return None, None
+    stdout = p.communicate()[0].strip()
+    if sys.version_info[0] >= 3:
+        stdout = stdout.decode()
+    if p.returncode != 0:
+        if verbose:
+            print("unable to run %s (error)" % dispcmd)
+            print("stdout was %s" % stdout)
+        return None, p.returncode
+    return stdout, p.returncode
+
+
+def versions_from_parentdir(parentdir_prefix, root, verbose):
+    """Try to determine the version from the parent directory name.
+
+    Source tarballs conventionally unpack into a directory that includes both
+    the project name and a version string. We will also support searching up
+    two directory levels for an appropriately named parent directory
+    """
+    rootdirs = []
+
+    for i in range(3):
+        dirname = os.path.basename(root)
+        if dirname.startswith(parentdir_prefix):
+            return {"version": dirname[len(parentdir_prefix):],
+                    "full-revisionid": None,
+                    "dirty": False, "error": None, "date": None}
+        else:
+            rootdirs.append(root)
+            root = os.path.dirname(root)  # up a level
+
+    if verbose:
+        print("Tried directories %s but none started with prefix %s" %
+              (str(rootdirs), parentdir_prefix))
+    raise NotThisMethod("rootdir doesn't start with parentdir_prefix")
+
+
+ at register_vcs_handler("git", "get_keywords")
+def git_get_keywords(versionfile_abs):
+    """Extract version information from the given file."""
+    # the code embedded in _version.py can just fetch the value of these
+    # keywords. When used from setup.py, we don't want to import _version.py,
+    # so we do it with a regexp instead. This function is not used from
+    # _version.py.
+    keywords = {}
+    try:
+        f = open(versionfile_abs, "r")
+        for line in f.readlines():
+            if line.strip().startswith("git_refnames ="):
+                mo = re.search(r'=\s*"(.*)"', line)
+                if mo:
+                    keywords["refnames"] = mo.group(1)
+            if line.strip().startswith("git_full ="):
+                mo = re.search(r'=\s*"(.*)"', line)
+                if mo:
+                    keywords["full"] = mo.group(1)
+            if line.strip().startswith("git_date ="):
+                mo = re.search(r'=\s*"(.*)"', line)
+                if mo:
+                    keywords["date"] = mo.group(1)
+        f.close()
+    except EnvironmentError:
+        pass
+    return keywords
+
+
+ at register_vcs_handler("git", "keywords")
+def git_versions_from_keywords(keywords, tag_prefix, verbose):
+    """Get version information from git keywords."""
+    if not keywords:
+        raise NotThisMethod("no keywords at all, weird")
+    date = keywords.get("date")
+    if date is not None:
+        # git-2.2.0 added "%cI", which expands to an ISO-8601 -compliant
+        # datestamp. However we prefer "%ci" (which expands to an "ISO-8601
+        # -like" string, which we must then edit to make compliant), because
+        # it's been around since git-1.5.3, and it's too difficult to
+        # discover which version we're using, or to work around using an
+        # older one.
+        date = date.strip().replace(" ", "T", 1).replace(" ", "", 1)
+    refnames = keywords["refnames"].strip()
+    if refnames.startswith("$Format"):
+        if verbose:
+            print("keywords are unexpanded, not using")
+        raise NotThisMethod("unexpanded keywords, not a git-archive tarball")
+    refs = set([r.strip() for r in refnames.strip("()").split(",")])
+    # starting in git-1.8.3, tags are listed as "tag: foo-1.0" instead of
+    # just "foo-1.0". If we see a "tag: " prefix, prefer those.
+    TAG = "tag: "
+    tags = set([r[len(TAG):] for r in refs if r.startswith(TAG)])
+    if not tags:
+        # Either we're using git < 1.8.3, or there really are no tags. We use
+        # a heuristic: assume all version tags have a digit. The old git %d
+        # expansion behaves like git log --decorate=short and strips out the
+        # refs/heads/ and refs/tags/ prefixes that would let us distinguish
+        # between branches and tags. By ignoring refnames without digits, we
+        # filter out many common branch names like "release" and
+        # "stabilization", as well as "HEAD" and "master".
+        tags = set([r for r in refs if re.search(r'\d', r)])
+        if verbose:
+            print("discarding '%s', no digits" % ",".join(refs - tags))
+    if verbose:
+        print("likely tags: %s" % ",".join(sorted(tags)))
+    for ref in sorted(tags):
+        # sorting will prefer e.g. "2.0" over "2.0rc1"
+        if ref.startswith(tag_prefix):
+            r = ref[len(tag_prefix):]
+            if verbose:
+                print("picking %s" % r)
+            return {"version": r,
+                    "full-revisionid": keywords["full"].strip(),
+                    "dirty": False, "error": None,
+                    "date": date}
+    # no suitable tags, so version is "0+unknown", but full hex is still there
+    if verbose:
+        print("no suitable tags, using unknown + full revision id")
+    return {"version": "0+unknown",
+            "full-revisionid": keywords["full"].strip(),
+            "dirty": False, "error": "no suitable tags", "date": None}
+
+
+ at register_vcs_handler("git", "pieces_from_vcs")
+def git_pieces_from_vcs(tag_prefix, root, verbose, run_command=run_command):
+    """Get version from 'git describe' in the root of the source tree.
+
+    This only gets called if the git-archive 'subst' keywords were *not*
+    expanded, and _version.py hasn't already been rewritten with a short
+    version string, meaning we're inside a checked out source tree.
+    """
+    GITS = ["git"]
+    if sys.platform == "win32":
+        GITS = ["git.cmd", "git.exe"]
+
+    out, rc = run_command(GITS, ["rev-parse", "--git-dir"], cwd=root,
+                          hide_stderr=True)
+    if rc != 0:
+        if verbose:
+            print("Directory %s not under git control" % root)
+        raise NotThisMethod("'git rev-parse --git-dir' returned error")
+
+    # if there is a tag matching tag_prefix, this yields TAG-NUM-gHEX[-dirty]
+    # if there isn't one, this yields HEX[-dirty] (no NUM)
+    describe_out, rc = run_command(GITS, ["describe", "--tags", "--dirty",
+                                          "--always", "--long",
+                                          "--match", "%s*" % tag_prefix],
+                                   cwd=root)
+    # --long was added in git-1.5.5
+    if describe_out is None:
+        raise NotThisMethod("'git describe' failed")
+    describe_out = describe_out.strip()
+    full_out, rc = run_command(GITS, ["rev-parse", "HEAD"], cwd=root)
+    if full_out is None:
+        raise NotThisMethod("'git rev-parse' failed")
+    full_out = full_out.strip()
+
+    pieces = {}
+    pieces["long"] = full_out
+    pieces["short"] = full_out[:7]  # maybe improved later
+    pieces["error"] = None
+
+    # parse describe_out. It will be like TAG-NUM-gHEX[-dirty] or HEX[-dirty]
+    # TAG might have hyphens.
+    git_describe = describe_out
+
+    # look for -dirty suffix
+    dirty = git_describe.endswith("-dirty")
+    pieces["dirty"] = dirty
+    if dirty:
+        git_describe = git_describe[:git_describe.rindex("-dirty")]
+
+    # now we have TAG-NUM-gHEX or HEX
+
+    if "-" in git_describe:
+        # TAG-NUM-gHEX
+        mo = re.search(r'^(.+)-(\d+)-g([0-9a-f]+)$', git_describe)
+        if not mo:
+            # unparseable. Maybe git-describe is misbehaving?
+            pieces["error"] = ("unable to parse git-describe output: '%s'"
+                               % describe_out)
+            return pieces
+
+        # tag
+        full_tag = mo.group(1)
+        if not full_tag.startswith(tag_prefix):
+            if verbose:
+                fmt = "tag '%s' doesn't start with prefix '%s'"
+                print(fmt % (full_tag, tag_prefix))
+            pieces["error"] = ("tag '%s' doesn't start with prefix '%s'"
+                               % (full_tag, tag_prefix))
+            return pieces
+        pieces["closest-tag"] = full_tag[len(tag_prefix):]
+
+        # distance: number of commits since tag
+        pieces["distance"] = int(mo.group(2))
+
+        # commit: short hex revision ID
+        pieces["short"] = mo.group(3)
+
+    else:
+        # HEX: no tags
+        pieces["closest-tag"] = None
+        count_out, rc = run_command(GITS, ["rev-list", "HEAD", "--count"],
+                                    cwd=root)
+        pieces["distance"] = int(count_out)  # total number of commits
+
+    # commit date: see ISO-8601 comment in git_versions_from_keywords()
+    date = run_command(GITS, ["show", "-s", "--format=%ci", "HEAD"],
+                       cwd=root)[0].strip()
+    pieces["date"] = date.strip().replace(" ", "T", 1).replace(" ", "", 1)
+
+    return pieces
+
+
+def plus_or_dot(pieces):
+    """Return a + if we don't already have one, else return a ."""
+    if "+" in pieces.get("closest-tag", ""):
+        return "."
+    return "+"
+
+
+def render_pep440(pieces):
+    """Build up version string, with post-release "local version identifier".
+
+    Our goal: TAG[+DISTANCE.gHEX[.dirty]] . Note that if you
+    get a tagged build and then dirty it, you'll get TAG+0.gHEX.dirty
+
+    Exceptions:
+    1: no tags. git_describe was just HEX. 0+untagged.DISTANCE.gHEX[.dirty]
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"] or pieces["dirty"]:
+            rendered += plus_or_dot(pieces)
+            rendered += "%d.g%s" % (pieces["distance"], pieces["short"])
+            if pieces["dirty"]:
+                rendered += ".dirty"
+    else:
+        # exception #1
+        rendered = "0+untagged.%d.g%s" % (pieces["distance"],
+                                          pieces["short"])
+        if pieces["dirty"]:
+            rendered += ".dirty"
+    return rendered
+
+
+def render_pep440_pre(pieces):
+    """TAG[.post.devDISTANCE] -- No -dirty.
+
+    Exceptions:
+    1: no tags. 0.post.devDISTANCE
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"]:
+            rendered += ".post.dev%d" % pieces["distance"]
+    else:
+        # exception #1
+        rendered = "0.post.dev%d" % pieces["distance"]
+    return rendered
+
+
+def render_pep440_post(pieces):
+    """TAG[.postDISTANCE[.dev0]+gHEX] .
+
+    The ".dev0" means dirty. Note that .dev0 sorts backwards
+    (a dirty tree will appear "older" than the corresponding clean one),
+    but you shouldn't be releasing software with -dirty anyways.
+
+    Exceptions:
+    1: no tags. 0.postDISTANCE[.dev0]
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"] or pieces["dirty"]:
+            rendered += ".post%d" % pieces["distance"]
+            if pieces["dirty"]:
+                rendered += ".dev0"
+            rendered += plus_or_dot(pieces)
+            rendered += "g%s" % pieces["short"]
+    else:
+        # exception #1
+        rendered = "0.post%d" % pieces["distance"]
+        if pieces["dirty"]:
+            rendered += ".dev0"
+        rendered += "+g%s" % pieces["short"]
+    return rendered
+
+
+def render_pep440_old(pieces):
+    """TAG[.postDISTANCE[.dev0]] .
+
+    The ".dev0" means dirty.
+
+    Eexceptions:
+    1: no tags. 0.postDISTANCE[.dev0]
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"] or pieces["dirty"]:
+            rendered += ".post%d" % pieces["distance"]
+            if pieces["dirty"]:
+                rendered += ".dev0"
+    else:
+        # exception #1
+        rendered = "0.post%d" % pieces["distance"]
+        if pieces["dirty"]:
+            rendered += ".dev0"
+    return rendered
+
+
+def render_git_describe(pieces):
+    """TAG[-DISTANCE-gHEX][-dirty].
+
+    Like 'git describe --tags --dirty --always'.
+
+    Exceptions:
+    1: no tags. HEX[-dirty]  (note: no 'g' prefix)
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"]:
+            rendered += "-%d-g%s" % (pieces["distance"], pieces["short"])
+    else:
+        # exception #1
+        rendered = pieces["short"]
+    if pieces["dirty"]:
+        rendered += "-dirty"
+    return rendered
+
+
+def render_git_describe_long(pieces):
+    """TAG-DISTANCE-gHEX[-dirty].
+
+    Like 'git describe --tags --dirty --always -long'.
+    The distance/hash is unconditional.
+
+    Exceptions:
+    1: no tags. HEX[-dirty]  (note: no 'g' prefix)
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        rendered += "-%d-g%s" % (pieces["distance"], pieces["short"])
+    else:
+        # exception #1
+        rendered = pieces["short"]
+    if pieces["dirty"]:
+        rendered += "-dirty"
+    return rendered
+
+
+def render(pieces, style):
+    """Render the given version pieces into the requested style."""
+    if pieces["error"]:
+        return {"version": "unknown",
+                "full-revisionid": pieces.get("long"),
+                "dirty": None,
+                "error": pieces["error"],
+                "date": None}
+
+    if not style or style == "default":
+        style = "pep440"  # the default
+
+    if style == "pep440":
+        rendered = render_pep440(pieces)
+    elif style == "pep440-pre":
+        rendered = render_pep440_pre(pieces)
+    elif style == "pep440-post":
+        rendered = render_pep440_post(pieces)
+    elif style == "pep440-old":
+        rendered = render_pep440_old(pieces)
+    elif style == "git-describe":
+        rendered = render_git_describe(pieces)
+    elif style == "git-describe-long":
+        rendered = render_git_describe_long(pieces)
+    else:
+        raise ValueError("unknown style '%s'" % style)
+
+    return {"version": rendered, "full-revisionid": pieces["long"],
+            "dirty": pieces["dirty"], "error": None,
+            "date": pieces.get("date")}
+
+
+def get_versions():
+    """Get version information or return default if unable to do so."""
+    # I am in _version.py, which lives at ROOT/VERSIONFILE_SOURCE. If we have
+    # __file__, we can work backwards from there to the root. Some
+    # py2exe/bbfreeze/non-CPython implementations don't do __file__, in which
+    # case we can only use expanded keywords.
+
+    cfg = get_config()
+    verbose = cfg.verbose
+
+    try:
+        return git_versions_from_keywords(get_keywords(), cfg.tag_prefix,
+                                          verbose)
+    except NotThisMethod:
+        pass
+
+    try:
+        root = os.path.realpath(__file__)
+        # versionfile_source is the relative path from the top of the source
+        # tree (where the .git directory might live) to this file. Invert
+        # this to find the root from __file__.
+        for i in cfg.versionfile_source.split('/'):
+            root = os.path.dirname(root)
+    except NameError:
+        return {"version": "0+unknown", "full-revisionid": None,
+                "dirty": None,
+                "error": "unable to find root of source tree",
+                "date": None}
+
+    try:
+        pieces = git_pieces_from_vcs(cfg.tag_prefix, root, verbose)
+        return render(pieces, cfg.style)
+    except NotThisMethod:
+        pass
+
+    try:
+        if cfg.parentdir_prefix:
+            return versions_from_parentdir(cfg.parentdir_prefix, root, verbose)
+    except NotThisMethod:
+        pass
+
+    return {"version": "0+unknown", "full-revisionid": None,
+            "dirty": None,
+            "error": "unable to compute version", "date": None}


=====================================
trollimage/xrimage.py
=====================================
@@ -164,17 +164,16 @@ def color_interp(data):
 
 
 class XRImage(object):
-    """Image class using xarray as internal storage."""
+    """Image class using an :class:`xarray.DataArray` as internal storage."""
 
     def __init__(self, data):
-        """Initialize the image."""
+        """Initialize the image with a :class:`~xarray.DataArray`."""
         data = self._correct_dims(data)
 
         # 'data' is an XArray, get the data from it as a dask array
         if not isinstance(data.data, da.Array):
             logger.debug("Convert image data to dask array")
-            data.data = da.from_array(data.data, chunks=(data.sizes['bands'],
-                                                         4096, 4096))
+            data.data = da.from_array(data.data, chunks=(data.sizes['bands'], 4096, 4096))
 
         self.data = data
         self.height, self.width = self.data.sizes['y'], self.data.sizes['x']
@@ -378,21 +377,160 @@ class XRImage(object):
 
         return meta
 
-    def fill_or_alpha(self, data, fill_value=None):
-        """Fill the data with fill_value, or create an alpha channels."""
-        if fill_value is None and not self.mode.endswith("A"):
-            not_alpha = [b for b in data.coords['bands'].values if b != 'A']
-            # if any of the bands are valid, we don't want transparency
-            null_mask = data.sel(bands=not_alpha).notnull().any(dim='bands')
-            null_mask = null_mask.expand_dims('bands')
-            null_mask['bands'] = ['A']
-
-            data = xr.concat([data, null_mask.astype(data.dtype)],
-                             dim="bands")
-        elif fill_value is not None:
-            data = data.fillna(fill_value)
+    def _create_alpha(self, data, fill_value=None):
+        """Create an alpha band DataArray object.
+
+        If `fill_value` is provided and input data is an integer type
+        then it is used to determine invalid "null" pixels instead of
+        xarray's `isnull` and `notnull` methods.
+
+        The returned array is 1 where data is valid, 0 where invalid.
+
+        """
+        not_alpha = [b for b in data.coords['bands'].values if b != 'A']
+        null_mask = data.sel(bands=not_alpha)
+        if np.issubdtype(data.dtype, np.integer) and fill_value is not None:
+            null_mask = null_mask != fill_value
+        else:
+            null_mask = null_mask.notnull()
+        # if any of the bands are valid, we don't want transparency
+        null_mask = null_mask.any(dim='bands')
+        null_mask = null_mask.expand_dims('bands')
+        null_mask['bands'] = ['A']
+        # match data dtype
+        return null_mask
+
+    def _add_alpha(self, data, alpha=None):
+        """Create an alpha channel and concatenate it to the provided data.
+
+        If ``data`` is an integer type then the alpha band will be scaled
+        to use the smallest (min) value as fully transparent and the largest
+        (max) value as fully opaque. For float types the alpha band spans
+        0 to 1.
+
+        """
+        null_mask = alpha if alpha is not None else self._create_alpha(data)
+        # if we are using integer data, then alpha needs to be min-int to max-int
+        # otherwise for floats we want 0 to 1
+        if np.issubdtype(data.dtype, np.integer):
+            # xarray sometimes upcasts this calculation, so cast again
+            null_mask = self._scale_to_dtype(null_mask, data.dtype).astype(data.dtype)
+        data = xr.concat([data, null_mask], dim="bands")
         return data
 
+    def _scale_to_dtype(self, data, dtype):
+        """Scale provided data to dtype range assuming a 0-1 range.
+
+        Float input data is assumed to be normalized to a 0 to 1 range.
+        Integer input data is not scaled, only clipped. A float output
+        type is not scaled since both outputs and inputs are assumed to
+        be in the 0-1 range already.
+
+        """
+        if np.issubdtype(dtype, np.integer):
+            if np.issubdtype(data, np.integer):
+                # preserve integer data type
+                data = data.clip(np.iinfo(dtype).min, np.iinfo(dtype).max)
+            else:
+                # scale float data (assumed to be 0 to 1) to full integer space
+                dinfo = np.iinfo(dtype)
+                data = data.clip(0, 1) * (dinfo.max - dinfo.min) + dinfo.min
+            data = data.round()
+        return data
+
+    def _check_modes(self, modes):
+        """Check that the image is in one of the given *modes*, raise an exception otherwise."""
+        if not isinstance(modes, (tuple, list, set)):
+            modes = [modes]
+        if self.mode not in modes:
+            raise ValueError("Image not in suitable mode, expected: %s, got: %s" % (modes, self.mode))
+
+    def _from_p(self, mode):
+        """Convert the image from P or PA to RGB or RGBA."""
+        self._check_modes(("P", "PA"))
+
+        if self.mode.endswith("A"):
+            alpha = self.data.sel(bands=["A"]).data
+            mode = mode + "A" if not mode.endswith("A") else mode
+        else:
+            alpha = None
+
+        if not self.palette:
+            raise RuntimeError("Can't convert palettized image, missing palette.")
+
+        pal = np.array(self.palette)
+        pal = da.from_array(pal, chunks=pal.shape)
+        flat_indexes = self.data.data[0].ravel().astype('int64')
+        new_shape = (3,) + self.data.shape[1:3]
+        new_data = pal[flat_indexes].reshape(new_shape)
+        coords = dict(self.data.coords)
+        coords["bands"] = list(mode)
+
+        if alpha is not None:
+            new_arr = da.concatenate((new_data, alpha), axis=0)
+            data = xr.DataArray(new_arr, coords=coords, attrs=self.data.attrs, dims=self.data.dims)
+        else:
+            data = xr.DataArray(new_data, coords=coords, attrs=self.data.attrs, dims=self.data.dims)
+
+        return data
+
+    def _l2rgb(self, mode):
+        """Convert from L (black and white) to RGB.
+        """
+        self._check_modes(("L", "LA"))
+
+        bands = ["L"] * 3
+        if mode[-1] == "A":
+            bands.append("A")
+        data = self.data.sel(bands=bands)
+        data["bands"] = list(mode)
+        return data
+
+    def convert(self, mode):
+        if mode == self.mode:
+            return self.__class__(self.data)
+
+        if mode not in ["P", "PA", "L", "LA", "RGB", "RGBA"]:
+            raise ValueError("Mode %s not recognized." % (mode))
+
+        if mode == self.mode + "A":
+            data = self._add_alpha(self.data).data
+            coords = dict(self.data.coords)
+            coords["bands"] = list(mode)
+            data = xr.DataArray(data, coords=coords, attrs=self.data.attrs, dims=self.data.dims)
+            new_img = XRImage(data)
+        elif mode + "A" == self.mode:
+            # Remove the alpha band from our current image
+            no_alpha = self.data.sel(bands=[b for b in self.data.coords["bands"].data if b != "A"]).data
+            coords = dict(self.data.coords)
+            coords["bands"] = list(mode)
+            data = xr.DataArray(no_alpha, coords=coords, attrs=self.data.attrs, dims=self.data.dims)
+            new_img = XRImage(data)
+        elif mode.endswith("A") and not self.mode.endswith("A"):
+            img = self.convert(self.mode + "A")
+            new_img = img.convert(mode)
+        elif self.mode.endswith("A") and not mode.endswith("A"):
+            img = self.convert(self.mode[:-1])
+            new_img = img.convert(mode)
+        else:
+            cases = {
+                "P": {"RGB": self._from_p},
+                "PA": {"RGBA": self._from_p},
+                "L": {"RGB": self._l2rgb},
+                "LA": {"RGBA": self._l2rgb}
+            }
+            try:
+                data = cases[self.mode][mode](mode)
+                new_img = XRImage(data)
+            except KeyError:
+                raise ValueError("Conversion from %s to %s not implemented !"
+                                 % (self.mode, mode))
+
+        if self.mode.startswith('P') and new_img.mode.startswith('P'):
+            # need to copy the palette
+            new_img.palette = self.palette
+        return new_img
+
     def _finalize(self, fill_value=None, dtype=np.uint8):
         """Wrapper around 'finalize' method for backwards compatibility."""
         import warnings
@@ -401,32 +539,51 @@ class XRImage(object):
         return self.finalize(fill_value, dtype)
 
     def finalize(self, fill_value=None, dtype=np.uint8):
-        """Finalize the image.
+        """Finalize the image to be written to an output file.
+
+        This adds an alpha band or fills data with a fill_value (if specified).
+        It also scales float data to the output range of the data type (0-255
+        for uint8, default). For integer input data this method assumes the
+        data is already scaled to the proper desired range. It will still fill
+        in invalid values and add an alpha band if needed. Integer input
+        data's fill value is determined by a special ``_FillValue`` attribute
+        in the ``DataArray`` ``.attrs`` dictionary.
 
-        This sets the channels in unsigned 8bit format ([0,255] range)
-        (if the *dtype* doesn't say otherwise).
         """
-        # if self.mode == "P":
-        #     self.convert("RGB")
-        # if self.mode == "PA":
-        #     self.convert("RGBA")
-        #
+        if self.mode == "P":
+            return self.convert("RGB").finalize(fill_value=fill_value, dtype=dtype)
+        if self.mode == "PA":
+            return self.convert("RGBA").finalize(fill_value=fill_value, dtype=dtype)
 
         if np.issubdtype(dtype, np.floating) and fill_value is None:
             logger.warning("Image with floats cannot be transparent, so "
                            "setting fill_value to 0")
             fill_value = 0
 
-        final_data = self.fill_or_alpha(self.data, fill_value)
-
-        if np.issubdtype(dtype, np.integer):
-            final_data = final_data.clip(0, 1) * np.iinfo(dtype).max
-            final_data = final_data.round().astype(dtype)
+        final_data = self.data
+        # if the data are integers then this fill value will be used to check for invalid values
+        ifill = final_data.attrs.get('_FillValue') if np.issubdtype(final_data, np.integer) else None
+        if fill_value is None and not self.mode.endswith('A'):
+            # We don't have a fill value or an alpha, let's add an alpha
+            alpha = self._create_alpha(final_data, fill_value=ifill)
+            final_data = self._scale_to_dtype(final_data, dtype).astype(dtype)
+            final_data = self._add_alpha(final_data, alpha=alpha)
         else:
-            final_data = final_data.astype(dtype)
-
+            # scale float data to the proper dtype
+            # this method doesn't cast yet so that we can keep track of NULL values
+            final_data = self._scale_to_dtype(final_data, dtype)
+            # Add fill_value after all other calculations have been done to
+            # make sure it is not scaled for the data type
+            if ifill is not None and fill_value is not None:
+                # cast fill value to output type so we don't change data type
+                fill_value = dtype(fill_value)
+                # integer fields have special fill values
+                final_data = final_data.where(final_data != ifill, dtype(fill_value))
+            elif fill_value is not None:
+                final_data = final_data.fillna(dtype(fill_value))
+
+        final_data = final_data.astype(dtype)
         final_data.attrs = self.data.attrs
-
         return final_data, ''.join(final_data['bands'].values)
 
     def pil_image(self, fill_value=None):
@@ -546,9 +703,11 @@ class XRImage(object):
         the [0,1] range.
         """
         if min_stretch is None:
-            min_stretch = self.data.min()
+            non_band_dims = tuple(x for x in self.data.dims if x != 'bands')
+            min_stretch = self.data.min(dim=non_band_dims)
         if max_stretch is None:
-            max_stretch = self.data.max()
+            non_band_dims = tuple(x for x in self.data.dims if x != 'bands')
+            max_stretch = self.data.max(dim=non_band_dims)
 
         if isinstance(min_stretch, (list, tuple)):
             min_stretch = self.xrify_tuples(min_stretch)
@@ -696,8 +855,12 @@ class XRImage(object):
                                                    img.channels[i].mask)
 
     def colorize(self, colormap):
-        """Colorize the current image using
-        *colormap*. Works only on"L" or "LA" images.
+        """Colorize the current image using `colormap`.
+
+        .. note::
+
+            Works only on "L" or "LA" images.
+
         """
 
         if self.mode not in ("L", "LA"):
@@ -710,16 +873,14 @@ class XRImage(object):
 
         l_data = self.data.sel(bands=['L'])
 
-        # TODO: dask-ify colorize
-        def _colorize(colormap, l_data):
-            channels = colormap.colorize(l_data.data)
+        def _colorize(l_data, colormap):
+            # 'l_data' is (1, rows, cols)
+            # 'channels' will be a list of 3 (RGB) or 4 (RGBA) arrays
+            channels = colormap.colorize(l_data)
             return np.concatenate(channels, axis=0)
 
-        # TODO: xarray-ify colorize
-        # delayed = dask.delayed(colormap.colorize)(l_data.data)
-        delayed = dask.delayed(_colorize)(colormap, l_data)
-        shape = (3, l_data.sizes['y'], l_data.sizes['x'])
-        new_data = da.from_delayed(delayed, shape=shape, dtype=np.float64)
+        new_data = l_data.data.map_blocks(_colorize, colormap,
+                                          chunks=(3,) + l_data.data.chunks[1:], dtype=np.float64)
 
         if alpha is not None:
             new_data = da.concatenate([new_data, alpha.data], axis=0)
@@ -732,12 +893,15 @@ class XRImage(object):
         coords['bands'] = list(mode)
         attrs = self.data.attrs
         dims = self.data.dims
-        self.data = xr.DataArray(new_data, coords=coords, attrs=attrs,
-                                 dims=dims)
+        self.data = xr.DataArray(new_data, coords=coords, attrs=attrs, dims=dims)
 
     def palettize(self, colormap):
-        """Palettize the current image using
-        *colormap*. Works only on"L" or "LA" images.
+        """Palettize the current image using `colormap`.
+
+        .. note::
+
+            Works only on "L" or "LA" images.
+
         """
 
         if self.mode not in ("L", "LA"):
@@ -746,31 +910,23 @@ class XRImage(object):
         l_data = self.data.sel(bands=['L'])
 
         def _palettize(data):
-            arr, palette = colormap.palettize(data.reshape(data.shape[1:]))
-            new_shape = (1, arr.shape[0], arr.shape[1])
-            arr = arr.reshape(new_shape)
-            return arr, palette
-
-        delayed = dask.delayed(_palettize)(l_data.data)
-        new_data, palette = delayed[0], delayed[1]
-        new_data = da.from_delayed(new_data, shape=l_data.shape,
-                                   dtype=l_data.dtype)
-        # XXX: Can we complete this method without computing the data?
-        new_data, self.palette = da.compute(new_data, palette)
-        new_data = da.from_array(new_data,
-                                 chunks=self.data.data.chunks)
+            # returns data and palette, only need data
+            return colormap.palettize(data)[0]
+
+        new_data = l_data.data.map_blocks(_palettize, dtype=l_data.dtype)
+        self.palette = tuple(colormap.colors)
 
         if self.mode == "L":
             mode = "P"
         else:
             mode = "PA"
+            new_data = da.concatenate([new_data, self.data.sel(bands=['A'])], axis=0)
 
         self.data.data = new_data
         self.data.coords['bands'] = list(mode)
 
     def blend(self, other):
-        """Alpha blend *other* on top of the current image.
-        """
+        """Alpha blend *other* on top of the current image."""
         raise NotImplementedError("This method has not be implemented for "
                                   "xarray support.")
 


=====================================
versioneer.py
=====================================
@@ -0,0 +1,1822 @@
+
+# Version: 0.18
+
+"""The Versioneer - like a rocketeer, but for versions.
+
+The Versioneer
+==============
+
+* like a rocketeer, but for versions!
+* https://github.com/warner/python-versioneer
+* Brian Warner
+* License: Public Domain
+* Compatible With: python2.6, 2.7, 3.2, 3.3, 3.4, 3.5, 3.6, and pypy
+* [![Latest Version]
+(https://pypip.in/version/versioneer/badge.svg?style=flat)
+](https://pypi.python.org/pypi/versioneer/)
+* [![Build Status]
+(https://travis-ci.org/warner/python-versioneer.png?branch=master)
+](https://travis-ci.org/warner/python-versioneer)
+
+This is a tool for managing a recorded version number in distutils-based
+python projects. The goal is to remove the tedious and error-prone "update
+the embedded version string" step from your release process. Making a new
+release should be as easy as recording a new tag in your version-control
+system, and maybe making new tarballs.
+
+
+## Quick Install
+
+* `pip install versioneer` to somewhere to your $PATH
+* add a `[versioneer]` section to your setup.cfg (see below)
+* run `versioneer install` in your source tree, commit the results
+
+## Version Identifiers
+
+Source trees come from a variety of places:
+
+* a version-control system checkout (mostly used by developers)
+* a nightly tarball, produced by build automation
+* a snapshot tarball, produced by a web-based VCS browser, like github's
+  "tarball from tag" feature
+* a release tarball, produced by "setup.py sdist", distributed through PyPI
+
+Within each source tree, the version identifier (either a string or a number,
+this tool is format-agnostic) can come from a variety of places:
+
+* ask the VCS tool itself, e.g. "git describe" (for checkouts), which knows
+  about recent "tags" and an absolute revision-id
+* the name of the directory into which the tarball was unpacked
+* an expanded VCS keyword ($Id$, etc)
+* a `_version.py` created by some earlier build step
+
+For released software, the version identifier is closely related to a VCS
+tag. Some projects use tag names that include more than just the version
+string (e.g. "myproject-1.2" instead of just "1.2"), in which case the tool
+needs to strip the tag prefix to extract the version identifier. For
+unreleased software (between tags), the version identifier should provide
+enough information to help developers recreate the same tree, while also
+giving them an idea of roughly how old the tree is (after version 1.2, before
+version 1.3). Many VCS systems can report a description that captures this,
+for example `git describe --tags --dirty --always` reports things like
+"0.7-1-g574ab98-dirty" to indicate that the checkout is one revision past the
+0.7 tag, has a unique revision id of "574ab98", and is "dirty" (it has
+uncommitted changes.
+
+The version identifier is used for multiple purposes:
+
+* to allow the module to self-identify its version: `myproject.__version__`
+* to choose a name and prefix for a 'setup.py sdist' tarball
+
+## Theory of Operation
+
+Versioneer works by adding a special `_version.py` file into your source
+tree, where your `__init__.py` can import it. This `_version.py` knows how to
+dynamically ask the VCS tool for version information at import time.
+
+`_version.py` also contains `$Revision$` markers, and the installation
+process marks `_version.py` to have this marker rewritten with a tag name
+during the `git archive` command. As a result, generated tarballs will
+contain enough information to get the proper version.
+
+To allow `setup.py` to compute a version too, a `versioneer.py` is added to
+the top level of your source tree, next to `setup.py` and the `setup.cfg`
+that configures it. This overrides several distutils/setuptools commands to
+compute the version when invoked, and changes `setup.py build` and `setup.py
+sdist` to replace `_version.py` with a small static file that contains just
+the generated version data.
+
+## Installation
+
+See [INSTALL.md](./INSTALL.md) for detailed installation instructions.
+
+## Version-String Flavors
+
+Code which uses Versioneer can learn about its version string at runtime by
+importing `_version` from your main `__init__.py` file and running the
+`get_versions()` function. From the "outside" (e.g. in `setup.py`), you can
+import the top-level `versioneer.py` and run `get_versions()`.
+
+Both functions return a dictionary with different flavors of version
+information:
+
+* `['version']`: A condensed version string, rendered using the selected
+  style. This is the most commonly used value for the project's version
+  string. The default "pep440" style yields strings like `0.11`,
+  `0.11+2.g1076c97`, or `0.11+2.g1076c97.dirty`. See the "Styles" section
+  below for alternative styles.
+
+* `['full-revisionid']`: detailed revision identifier. For Git, this is the
+  full SHA1 commit id, e.g. "1076c978a8d3cfc70f408fe5974aa6c092c949ac".
+
+* `['date']`: Date and time of the latest `HEAD` commit. For Git, it is the
+  commit date in ISO 8601 format. This will be None if the date is not
+  available.
+
+* `['dirty']`: a boolean, True if the tree has uncommitted changes. Note that
+  this is only accurate if run in a VCS checkout, otherwise it is likely to
+  be False or None
+
+* `['error']`: if the version string could not be computed, this will be set
+  to a string describing the problem, otherwise it will be None. It may be
+  useful to throw an exception in setup.py if this is set, to avoid e.g.
+  creating tarballs with a version string of "unknown".
+
+Some variants are more useful than others. Including `full-revisionid` in a
+bug report should allow developers to reconstruct the exact code being tested
+(or indicate the presence of local changes that should be shared with the
+developers). `version` is suitable for display in an "about" box or a CLI
+`--version` output: it can be easily compared against release notes and lists
+of bugs fixed in various releases.
+
+The installer adds the following text to your `__init__.py` to place a basic
+version in `YOURPROJECT.__version__`:
+
+    from ._version import get_versions
+    __version__ = get_versions()['version']
+    del get_versions
+
+## Styles
+
+The setup.cfg `style=` configuration controls how the VCS information is
+rendered into a version string.
+
+The default style, "pep440", produces a PEP440-compliant string, equal to the
+un-prefixed tag name for actual releases, and containing an additional "local
+version" section with more detail for in-between builds. For Git, this is
+TAG[+DISTANCE.gHEX[.dirty]] , using information from `git describe --tags
+--dirty --always`. For example "0.11+2.g1076c97.dirty" indicates that the
+tree is like the "1076c97" commit but has uncommitted changes (".dirty"), and
+that this commit is two revisions ("+2") beyond the "0.11" tag. For released
+software (exactly equal to a known tag), the identifier will only contain the
+stripped tag, e.g. "0.11".
+
+Other styles are available. See [details.md](details.md) in the Versioneer
+source tree for descriptions.
+
+## Debugging
+
+Versioneer tries to avoid fatal errors: if something goes wrong, it will tend
+to return a version of "0+unknown". To investigate the problem, run `setup.py
+version`, which will run the version-lookup code in a verbose mode, and will
+display the full contents of `get_versions()` (including the `error` string,
+which may help identify what went wrong).
+
+## Known Limitations
+
+Some situations are known to cause problems for Versioneer. This details the
+most significant ones. More can be found on Github
+[issues page](https://github.com/warner/python-versioneer/issues).
+
+### Subprojects
+
+Versioneer has limited support for source trees in which `setup.py` is not in
+the root directory (e.g. `setup.py` and `.git/` are *not* siblings). The are
+two common reasons why `setup.py` might not be in the root:
+
+* Source trees which contain multiple subprojects, such as
+  [Buildbot](https://github.com/buildbot/buildbot), which contains both
+  "master" and "slave" subprojects, each with their own `setup.py`,
+  `setup.cfg`, and `tox.ini`. Projects like these produce multiple PyPI
+  distributions (and upload multiple independently-installable tarballs).
+* Source trees whose main purpose is to contain a C library, but which also
+  provide bindings to Python (and perhaps other langauges) in subdirectories.
+
+Versioneer will look for `.git` in parent directories, and most operations
+should get the right version string. However `pip` and `setuptools` have bugs
+and implementation details which frequently cause `pip install .` from a
+subproject directory to fail to find a correct version string (so it usually
+defaults to `0+unknown`).
+
+`pip install --editable .` should work correctly. `setup.py install` might
+work too.
+
+Pip-8.1.1 is known to have this problem, but hopefully it will get fixed in
+some later version.
+
+[Bug #38](https://github.com/warner/python-versioneer/issues/38) is tracking
+this issue. The discussion in
+[PR #61](https://github.com/warner/python-versioneer/pull/61) describes the
+issue from the Versioneer side in more detail.
+[pip PR#3176](https://github.com/pypa/pip/pull/3176) and
+[pip PR#3615](https://github.com/pypa/pip/pull/3615) contain work to improve
+pip to let Versioneer work correctly.
+
+Versioneer-0.16 and earlier only looked for a `.git` directory next to the
+`setup.cfg`, so subprojects were completely unsupported with those releases.
+
+### Editable installs with setuptools <= 18.5
+
+`setup.py develop` and `pip install --editable .` allow you to install a
+project into a virtualenv once, then continue editing the source code (and
+test) without re-installing after every change.
+
+"Entry-point scripts" (`setup(entry_points={"console_scripts": ..})`) are a
+convenient way to specify executable scripts that should be installed along
+with the python package.
+
+These both work as expected when using modern setuptools. When using
+setuptools-18.5 or earlier, however, certain operations will cause
+`pkg_resources.DistributionNotFound` errors when running the entrypoint
+script, which must be resolved by re-installing the package. This happens
+when the install happens with one version, then the egg_info data is
+regenerated while a different version is checked out. Many setup.py commands
+cause egg_info to be rebuilt (including `sdist`, `wheel`, and installing into
+a different virtualenv), so this can be surprising.
+
+[Bug #83](https://github.com/warner/python-versioneer/issues/83) describes
+this one, but upgrading to a newer version of setuptools should probably
+resolve it.
+
+### Unicode version strings
+
+While Versioneer works (and is continually tested) with both Python 2 and
+Python 3, it is not entirely consistent with bytes-vs-unicode distinctions.
+Newer releases probably generate unicode version strings on py2. It's not
+clear that this is wrong, but it may be surprising for applications when then
+write these strings to a network connection or include them in bytes-oriented
+APIs like cryptographic checksums.
+
+[Bug #71](https://github.com/warner/python-versioneer/issues/71) investigates
+this question.
+
+
+## Updating Versioneer
+
+To upgrade your project to a new release of Versioneer, do the following:
+
+* install the new Versioneer (`pip install -U versioneer` or equivalent)
+* edit `setup.cfg`, if necessary, to include any new configuration settings
+  indicated by the release notes. See [UPGRADING](./UPGRADING.md) for details.
+* re-run `versioneer install` in your source tree, to replace
+  `SRC/_version.py`
+* commit any changed files
+
+## Future Directions
+
+This tool is designed to make it easily extended to other version-control
+systems: all VCS-specific components are in separate directories like
+src/git/ . The top-level `versioneer.py` script is assembled from these
+components by running make-versioneer.py . In the future, make-versioneer.py
+will take a VCS name as an argument, and will construct a version of
+`versioneer.py` that is specific to the given VCS. It might also take the
+configuration arguments that are currently provided manually during
+installation by editing setup.py . Alternatively, it might go the other
+direction and include code from all supported VCS systems, reducing the
+number of intermediate scripts.
+
+
+## License
+
+To make Versioneer easier to embed, all its code is dedicated to the public
+domain. The `_version.py` that it creates is also in the public domain.
+Specifically, both are released under the Creative Commons "Public Domain
+Dedication" license (CC0-1.0), as described in
+https://creativecommons.org/publicdomain/zero/1.0/ .
+
+"""
+
+from __future__ import print_function
+try:
+    import configparser
+except ImportError:
+    import ConfigParser as configparser
+import errno
+import json
+import os
+import re
+import subprocess
+import sys
+
+
+class VersioneerConfig:
+    """Container for Versioneer configuration parameters."""
+
+
+def get_root():
+    """Get the project root directory.
+
+    We require that all commands are run from the project root, i.e. the
+    directory that contains setup.py, setup.cfg, and versioneer.py .
+    """
+    root = os.path.realpath(os.path.abspath(os.getcwd()))
+    setup_py = os.path.join(root, "setup.py")
+    versioneer_py = os.path.join(root, "versioneer.py")
+    if not (os.path.exists(setup_py) or os.path.exists(versioneer_py)):
+        # allow 'python path/to/setup.py COMMAND'
+        root = os.path.dirname(os.path.realpath(os.path.abspath(sys.argv[0])))
+        setup_py = os.path.join(root, "setup.py")
+        versioneer_py = os.path.join(root, "versioneer.py")
+    if not (os.path.exists(setup_py) or os.path.exists(versioneer_py)):
+        err = ("Versioneer was unable to run the project root directory. "
+               "Versioneer requires setup.py to be executed from "
+               "its immediate directory (like 'python setup.py COMMAND'), "
+               "or in a way that lets it use sys.argv[0] to find the root "
+               "(like 'python path/to/setup.py COMMAND').")
+        raise VersioneerBadRootError(err)
+    try:
+        # Certain runtime workflows (setup.py install/develop in a setuptools
+        # tree) execute all dependencies in a single python process, so
+        # "versioneer" may be imported multiple times, and python's shared
+        # module-import table will cache the first one. So we can't use
+        # os.path.dirname(__file__), as that will find whichever
+        # versioneer.py was first imported, even in later projects.
+        me = os.path.realpath(os.path.abspath(__file__))
+        me_dir = os.path.normcase(os.path.splitext(me)[0])
+        vsr_dir = os.path.normcase(os.path.splitext(versioneer_py)[0])
+        if me_dir != vsr_dir:
+            print("Warning: build in %s is using versioneer.py from %s"
+                  % (os.path.dirname(me), versioneer_py))
+    except NameError:
+        pass
+    return root
+
+
+def get_config_from_root(root):
+    """Read the project setup.cfg file to determine Versioneer config."""
+    # This might raise EnvironmentError (if setup.cfg is missing), or
+    # configparser.NoSectionError (if it lacks a [versioneer] section), or
+    # configparser.NoOptionError (if it lacks "VCS="). See the docstring at
+    # the top of versioneer.py for instructions on writing your setup.cfg .
+    setup_cfg = os.path.join(root, "setup.cfg")
+    parser = configparser.SafeConfigParser()
+    with open(setup_cfg, "r") as f:
+        parser.readfp(f)
+    VCS = parser.get("versioneer", "VCS")  # mandatory
+
+    def get(parser, name):
+        if parser.has_option("versioneer", name):
+            return parser.get("versioneer", name)
+        return None
+    cfg = VersioneerConfig()
+    cfg.VCS = VCS
+    cfg.style = get(parser, "style") or ""
+    cfg.versionfile_source = get(parser, "versionfile_source")
+    cfg.versionfile_build = get(parser, "versionfile_build")
+    cfg.tag_prefix = get(parser, "tag_prefix")
+    if cfg.tag_prefix in ("''", '""'):
+        cfg.tag_prefix = ""
+    cfg.parentdir_prefix = get(parser, "parentdir_prefix")
+    cfg.verbose = get(parser, "verbose")
+    return cfg
+
+
+class NotThisMethod(Exception):
+    """Exception raised if a method is not valid for the current scenario."""
+
+
+# these dictionaries contain VCS-specific tools
+LONG_VERSION_PY = {}
+HANDLERS = {}
+
+
+def register_vcs_handler(vcs, method):  # decorator
+    """Decorator to mark a method as the handler for a particular VCS."""
+    def decorate(f):
+        """Store f in HANDLERS[vcs][method]."""
+        if vcs not in HANDLERS:
+            HANDLERS[vcs] = {}
+        HANDLERS[vcs][method] = f
+        return f
+    return decorate
+
+
+def run_command(commands, args, cwd=None, verbose=False, hide_stderr=False,
+                env=None):
+    """Call the given command(s)."""
+    assert isinstance(commands, list)
+    p = None
+    for c in commands:
+        try:
+            dispcmd = str([c] + args)
+            # remember shell=False, so use git.cmd on windows, not just git
+            p = subprocess.Popen([c] + args, cwd=cwd, env=env,
+                                 stdout=subprocess.PIPE,
+                                 stderr=(subprocess.PIPE if hide_stderr
+                                         else None))
+            break
+        except EnvironmentError:
+            e = sys.exc_info()[1]
+            if e.errno == errno.ENOENT:
+                continue
+            if verbose:
+                print("unable to run %s" % dispcmd)
+                print(e)
+            return None, None
+    else:
+        if verbose:
+            print("unable to find command, tried %s" % (commands,))
+        return None, None
+    stdout = p.communicate()[0].strip()
+    if sys.version_info[0] >= 3:
+        stdout = stdout.decode()
+    if p.returncode != 0:
+        if verbose:
+            print("unable to run %s (error)" % dispcmd)
+            print("stdout was %s" % stdout)
+        return None, p.returncode
+    return stdout, p.returncode
+
+
+LONG_VERSION_PY['git'] = '''
+# This file helps to compute a version number in source trees obtained from
+# git-archive tarball (such as those provided by githubs download-from-tag
+# feature). Distribution tarballs (built by setup.py sdist) and build
+# directories (produced by setup.py build) will contain a much shorter file
+# that just contains the computed version number.
+
+# This file is released into the public domain. Generated by
+# versioneer-0.18 (https://github.com/warner/python-versioneer)
+
+"""Git implementation of _version.py."""
+
+import errno
+import os
+import re
+import subprocess
+import sys
+
+
+def get_keywords():
+    """Get the keywords needed to look up the version information."""
+    # these strings will be replaced by git during git-archive.
+    # setup.py/versioneer.py will grep for the variable names, so they must
+    # each be defined on a line of their own. _version.py will just call
+    # get_keywords().
+    git_refnames = "%(DOLLAR)sFormat:%%d%(DOLLAR)s"
+    git_full = "%(DOLLAR)sFormat:%%H%(DOLLAR)s"
+    git_date = "%(DOLLAR)sFormat:%%ci%(DOLLAR)s"
+    keywords = {"refnames": git_refnames, "full": git_full, "date": git_date}
+    return keywords
+
+
+class VersioneerConfig:
+    """Container for Versioneer configuration parameters."""
+
+
+def get_config():
+    """Create, populate and return the VersioneerConfig() object."""
+    # these strings are filled in when 'setup.py versioneer' creates
+    # _version.py
+    cfg = VersioneerConfig()
+    cfg.VCS = "git"
+    cfg.style = "%(STYLE)s"
+    cfg.tag_prefix = "%(TAG_PREFIX)s"
+    cfg.parentdir_prefix = "%(PARENTDIR_PREFIX)s"
+    cfg.versionfile_source = "%(VERSIONFILE_SOURCE)s"
+    cfg.verbose = False
+    return cfg
+
+
+class NotThisMethod(Exception):
+    """Exception raised if a method is not valid for the current scenario."""
+
+
+LONG_VERSION_PY = {}
+HANDLERS = {}
+
+
+def register_vcs_handler(vcs, method):  # decorator
+    """Decorator to mark a method as the handler for a particular VCS."""
+    def decorate(f):
+        """Store f in HANDLERS[vcs][method]."""
+        if vcs not in HANDLERS:
+            HANDLERS[vcs] = {}
+        HANDLERS[vcs][method] = f
+        return f
+    return decorate
+
+
+def run_command(commands, args, cwd=None, verbose=False, hide_stderr=False,
+                env=None):
+    """Call the given command(s)."""
+    assert isinstance(commands, list)
+    p = None
+    for c in commands:
+        try:
+            dispcmd = str([c] + args)
+            # remember shell=False, so use git.cmd on windows, not just git
+            p = subprocess.Popen([c] + args, cwd=cwd, env=env,
+                                 stdout=subprocess.PIPE,
+                                 stderr=(subprocess.PIPE if hide_stderr
+                                         else None))
+            break
+        except EnvironmentError:
+            e = sys.exc_info()[1]
+            if e.errno == errno.ENOENT:
+                continue
+            if verbose:
+                print("unable to run %%s" %% dispcmd)
+                print(e)
+            return None, None
+    else:
+        if verbose:
+            print("unable to find command, tried %%s" %% (commands,))
+        return None, None
+    stdout = p.communicate()[0].strip()
+    if sys.version_info[0] >= 3:
+        stdout = stdout.decode()
+    if p.returncode != 0:
+        if verbose:
+            print("unable to run %%s (error)" %% dispcmd)
+            print("stdout was %%s" %% stdout)
+        return None, p.returncode
+    return stdout, p.returncode
+
+
+def versions_from_parentdir(parentdir_prefix, root, verbose):
+    """Try to determine the version from the parent directory name.
+
+    Source tarballs conventionally unpack into a directory that includes both
+    the project name and a version string. We will also support searching up
+    two directory levels for an appropriately named parent directory
+    """
+    rootdirs = []
+
+    for i in range(3):
+        dirname = os.path.basename(root)
+        if dirname.startswith(parentdir_prefix):
+            return {"version": dirname[len(parentdir_prefix):],
+                    "full-revisionid": None,
+                    "dirty": False, "error": None, "date": None}
+        else:
+            rootdirs.append(root)
+            root = os.path.dirname(root)  # up a level
+
+    if verbose:
+        print("Tried directories %%s but none started with prefix %%s" %%
+              (str(rootdirs), parentdir_prefix))
+    raise NotThisMethod("rootdir doesn't start with parentdir_prefix")
+
+
+ at register_vcs_handler("git", "get_keywords")
+def git_get_keywords(versionfile_abs):
+    """Extract version information from the given file."""
+    # the code embedded in _version.py can just fetch the value of these
+    # keywords. When used from setup.py, we don't want to import _version.py,
+    # so we do it with a regexp instead. This function is not used from
+    # _version.py.
+    keywords = {}
+    try:
+        f = open(versionfile_abs, "r")
+        for line in f.readlines():
+            if line.strip().startswith("git_refnames ="):
+                mo = re.search(r'=\s*"(.*)"', line)
+                if mo:
+                    keywords["refnames"] = mo.group(1)
+            if line.strip().startswith("git_full ="):
+                mo = re.search(r'=\s*"(.*)"', line)
+                if mo:
+                    keywords["full"] = mo.group(1)
+            if line.strip().startswith("git_date ="):
+                mo = re.search(r'=\s*"(.*)"', line)
+                if mo:
+                    keywords["date"] = mo.group(1)
+        f.close()
+    except EnvironmentError:
+        pass
+    return keywords
+
+
+ at register_vcs_handler("git", "keywords")
+def git_versions_from_keywords(keywords, tag_prefix, verbose):
+    """Get version information from git keywords."""
+    if not keywords:
+        raise NotThisMethod("no keywords at all, weird")
+    date = keywords.get("date")
+    if date is not None:
+        # git-2.2.0 added "%%cI", which expands to an ISO-8601 -compliant
+        # datestamp. However we prefer "%%ci" (which expands to an "ISO-8601
+        # -like" string, which we must then edit to make compliant), because
+        # it's been around since git-1.5.3, and it's too difficult to
+        # discover which version we're using, or to work around using an
+        # older one.
+        date = date.strip().replace(" ", "T", 1).replace(" ", "", 1)
+    refnames = keywords["refnames"].strip()
+    if refnames.startswith("$Format"):
+        if verbose:
+            print("keywords are unexpanded, not using")
+        raise NotThisMethod("unexpanded keywords, not a git-archive tarball")
+    refs = set([r.strip() for r in refnames.strip("()").split(",")])
+    # starting in git-1.8.3, tags are listed as "tag: foo-1.0" instead of
+    # just "foo-1.0". If we see a "tag: " prefix, prefer those.
+    TAG = "tag: "
+    tags = set([r[len(TAG):] for r in refs if r.startswith(TAG)])
+    if not tags:
+        # Either we're using git < 1.8.3, or there really are no tags. We use
+        # a heuristic: assume all version tags have a digit. The old git %%d
+        # expansion behaves like git log --decorate=short and strips out the
+        # refs/heads/ and refs/tags/ prefixes that would let us distinguish
+        # between branches and tags. By ignoring refnames without digits, we
+        # filter out many common branch names like "release" and
+        # "stabilization", as well as "HEAD" and "master".
+        tags = set([r for r in refs if re.search(r'\d', r)])
+        if verbose:
+            print("discarding '%%s', no digits" %% ",".join(refs - tags))
+    if verbose:
+        print("likely tags: %%s" %% ",".join(sorted(tags)))
+    for ref in sorted(tags):
+        # sorting will prefer e.g. "2.0" over "2.0rc1"
+        if ref.startswith(tag_prefix):
+            r = ref[len(tag_prefix):]
+            if verbose:
+                print("picking %%s" %% r)
+            return {"version": r,
+                    "full-revisionid": keywords["full"].strip(),
+                    "dirty": False, "error": None,
+                    "date": date}
+    # no suitable tags, so version is "0+unknown", but full hex is still there
+    if verbose:
+        print("no suitable tags, using unknown + full revision id")
+    return {"version": "0+unknown",
+            "full-revisionid": keywords["full"].strip(),
+            "dirty": False, "error": "no suitable tags", "date": None}
+
+
+ at register_vcs_handler("git", "pieces_from_vcs")
+def git_pieces_from_vcs(tag_prefix, root, verbose, run_command=run_command):
+    """Get version from 'git describe' in the root of the source tree.
+
+    This only gets called if the git-archive 'subst' keywords were *not*
+    expanded, and _version.py hasn't already been rewritten with a short
+    version string, meaning we're inside a checked out source tree.
+    """
+    GITS = ["git"]
+    if sys.platform == "win32":
+        GITS = ["git.cmd", "git.exe"]
+
+    out, rc = run_command(GITS, ["rev-parse", "--git-dir"], cwd=root,
+                          hide_stderr=True)
+    if rc != 0:
+        if verbose:
+            print("Directory %%s not under git control" %% root)
+        raise NotThisMethod("'git rev-parse --git-dir' returned error")
+
+    # if there is a tag matching tag_prefix, this yields TAG-NUM-gHEX[-dirty]
+    # if there isn't one, this yields HEX[-dirty] (no NUM)
+    describe_out, rc = run_command(GITS, ["describe", "--tags", "--dirty",
+                                          "--always", "--long",
+                                          "--match", "%%s*" %% tag_prefix],
+                                   cwd=root)
+    # --long was added in git-1.5.5
+    if describe_out is None:
+        raise NotThisMethod("'git describe' failed")
+    describe_out = describe_out.strip()
+    full_out, rc = run_command(GITS, ["rev-parse", "HEAD"], cwd=root)
+    if full_out is None:
+        raise NotThisMethod("'git rev-parse' failed")
+    full_out = full_out.strip()
+
+    pieces = {}
+    pieces["long"] = full_out
+    pieces["short"] = full_out[:7]  # maybe improved later
+    pieces["error"] = None
+
+    # parse describe_out. It will be like TAG-NUM-gHEX[-dirty] or HEX[-dirty]
+    # TAG might have hyphens.
+    git_describe = describe_out
+
+    # look for -dirty suffix
+    dirty = git_describe.endswith("-dirty")
+    pieces["dirty"] = dirty
+    if dirty:
+        git_describe = git_describe[:git_describe.rindex("-dirty")]
+
+    # now we have TAG-NUM-gHEX or HEX
+
+    if "-" in git_describe:
+        # TAG-NUM-gHEX
+        mo = re.search(r'^(.+)-(\d+)-g([0-9a-f]+)$', git_describe)
+        if not mo:
+            # unparseable. Maybe git-describe is misbehaving?
+            pieces["error"] = ("unable to parse git-describe output: '%%s'"
+                               %% describe_out)
+            return pieces
+
+        # tag
+        full_tag = mo.group(1)
+        if not full_tag.startswith(tag_prefix):
+            if verbose:
+                fmt = "tag '%%s' doesn't start with prefix '%%s'"
+                print(fmt %% (full_tag, tag_prefix))
+            pieces["error"] = ("tag '%%s' doesn't start with prefix '%%s'"
+                               %% (full_tag, tag_prefix))
+            return pieces
+        pieces["closest-tag"] = full_tag[len(tag_prefix):]
+
+        # distance: number of commits since tag
+        pieces["distance"] = int(mo.group(2))
+
+        # commit: short hex revision ID
+        pieces["short"] = mo.group(3)
+
+    else:
+        # HEX: no tags
+        pieces["closest-tag"] = None
+        count_out, rc = run_command(GITS, ["rev-list", "HEAD", "--count"],
+                                    cwd=root)
+        pieces["distance"] = int(count_out)  # total number of commits
+
+    # commit date: see ISO-8601 comment in git_versions_from_keywords()
+    date = run_command(GITS, ["show", "-s", "--format=%%ci", "HEAD"],
+                       cwd=root)[0].strip()
+    pieces["date"] = date.strip().replace(" ", "T", 1).replace(" ", "", 1)
+
+    return pieces
+
+
+def plus_or_dot(pieces):
+    """Return a + if we don't already have one, else return a ."""
+    if "+" in pieces.get("closest-tag", ""):
+        return "."
+    return "+"
+
+
+def render_pep440(pieces):
+    """Build up version string, with post-release "local version identifier".
+
+    Our goal: TAG[+DISTANCE.gHEX[.dirty]] . Note that if you
+    get a tagged build and then dirty it, you'll get TAG+0.gHEX.dirty
+
+    Exceptions:
+    1: no tags. git_describe was just HEX. 0+untagged.DISTANCE.gHEX[.dirty]
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"] or pieces["dirty"]:
+            rendered += plus_or_dot(pieces)
+            rendered += "%%d.g%%s" %% (pieces["distance"], pieces["short"])
+            if pieces["dirty"]:
+                rendered += ".dirty"
+    else:
+        # exception #1
+        rendered = "0+untagged.%%d.g%%s" %% (pieces["distance"],
+                                          pieces["short"])
+        if pieces["dirty"]:
+            rendered += ".dirty"
+    return rendered
+
+
+def render_pep440_pre(pieces):
+    """TAG[.post.devDISTANCE] -- No -dirty.
+
+    Exceptions:
+    1: no tags. 0.post.devDISTANCE
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"]:
+            rendered += ".post.dev%%d" %% pieces["distance"]
+    else:
+        # exception #1
+        rendered = "0.post.dev%%d" %% pieces["distance"]
+    return rendered
+
+
+def render_pep440_post(pieces):
+    """TAG[.postDISTANCE[.dev0]+gHEX] .
+
+    The ".dev0" means dirty. Note that .dev0 sorts backwards
+    (a dirty tree will appear "older" than the corresponding clean one),
+    but you shouldn't be releasing software with -dirty anyways.
+
+    Exceptions:
+    1: no tags. 0.postDISTANCE[.dev0]
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"] or pieces["dirty"]:
+            rendered += ".post%%d" %% pieces["distance"]
+            if pieces["dirty"]:
+                rendered += ".dev0"
+            rendered += plus_or_dot(pieces)
+            rendered += "g%%s" %% pieces["short"]
+    else:
+        # exception #1
+        rendered = "0.post%%d" %% pieces["distance"]
+        if pieces["dirty"]:
+            rendered += ".dev0"
+        rendered += "+g%%s" %% pieces["short"]
+    return rendered
+
+
+def render_pep440_old(pieces):
+    """TAG[.postDISTANCE[.dev0]] .
+
+    The ".dev0" means dirty.
+
+    Eexceptions:
+    1: no tags. 0.postDISTANCE[.dev0]
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"] or pieces["dirty"]:
+            rendered += ".post%%d" %% pieces["distance"]
+            if pieces["dirty"]:
+                rendered += ".dev0"
+    else:
+        # exception #1
+        rendered = "0.post%%d" %% pieces["distance"]
+        if pieces["dirty"]:
+            rendered += ".dev0"
+    return rendered
+
+
+def render_git_describe(pieces):
+    """TAG[-DISTANCE-gHEX][-dirty].
+
+    Like 'git describe --tags --dirty --always'.
+
+    Exceptions:
+    1: no tags. HEX[-dirty]  (note: no 'g' prefix)
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"]:
+            rendered += "-%%d-g%%s" %% (pieces["distance"], pieces["short"])
+    else:
+        # exception #1
+        rendered = pieces["short"]
+    if pieces["dirty"]:
+        rendered += "-dirty"
+    return rendered
+
+
+def render_git_describe_long(pieces):
+    """TAG-DISTANCE-gHEX[-dirty].
+
+    Like 'git describe --tags --dirty --always -long'.
+    The distance/hash is unconditional.
+
+    Exceptions:
+    1: no tags. HEX[-dirty]  (note: no 'g' prefix)
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        rendered += "-%%d-g%%s" %% (pieces["distance"], pieces["short"])
+    else:
+        # exception #1
+        rendered = pieces["short"]
+    if pieces["dirty"]:
+        rendered += "-dirty"
+    return rendered
+
+
+def render(pieces, style):
+    """Render the given version pieces into the requested style."""
+    if pieces["error"]:
+        return {"version": "unknown",
+                "full-revisionid": pieces.get("long"),
+                "dirty": None,
+                "error": pieces["error"],
+                "date": None}
+
+    if not style or style == "default":
+        style = "pep440"  # the default
+
+    if style == "pep440":
+        rendered = render_pep440(pieces)
+    elif style == "pep440-pre":
+        rendered = render_pep440_pre(pieces)
+    elif style == "pep440-post":
+        rendered = render_pep440_post(pieces)
+    elif style == "pep440-old":
+        rendered = render_pep440_old(pieces)
+    elif style == "git-describe":
+        rendered = render_git_describe(pieces)
+    elif style == "git-describe-long":
+        rendered = render_git_describe_long(pieces)
+    else:
+        raise ValueError("unknown style '%%s'" %% style)
+
+    return {"version": rendered, "full-revisionid": pieces["long"],
+            "dirty": pieces["dirty"], "error": None,
+            "date": pieces.get("date")}
+
+
+def get_versions():
+    """Get version information or return default if unable to do so."""
+    # I am in _version.py, which lives at ROOT/VERSIONFILE_SOURCE. If we have
+    # __file__, we can work backwards from there to the root. Some
+    # py2exe/bbfreeze/non-CPython implementations don't do __file__, in which
+    # case we can only use expanded keywords.
+
+    cfg = get_config()
+    verbose = cfg.verbose
+
+    try:
+        return git_versions_from_keywords(get_keywords(), cfg.tag_prefix,
+                                          verbose)
+    except NotThisMethod:
+        pass
+
+    try:
+        root = os.path.realpath(__file__)
+        # versionfile_source is the relative path from the top of the source
+        # tree (where the .git directory might live) to this file. Invert
+        # this to find the root from __file__.
+        for i in cfg.versionfile_source.split('/'):
+            root = os.path.dirname(root)
+    except NameError:
+        return {"version": "0+unknown", "full-revisionid": None,
+                "dirty": None,
+                "error": "unable to find root of source tree",
+                "date": None}
+
+    try:
+        pieces = git_pieces_from_vcs(cfg.tag_prefix, root, verbose)
+        return render(pieces, cfg.style)
+    except NotThisMethod:
+        pass
+
+    try:
+        if cfg.parentdir_prefix:
+            return versions_from_parentdir(cfg.parentdir_prefix, root, verbose)
+    except NotThisMethod:
+        pass
+
+    return {"version": "0+unknown", "full-revisionid": None,
+            "dirty": None,
+            "error": "unable to compute version", "date": None}
+'''
+
+
+ at register_vcs_handler("git", "get_keywords")
+def git_get_keywords(versionfile_abs):
+    """Extract version information from the given file."""
+    # the code embedded in _version.py can just fetch the value of these
+    # keywords. When used from setup.py, we don't want to import _version.py,
+    # so we do it with a regexp instead. This function is not used from
+    # _version.py.
+    keywords = {}
+    try:
+        f = open(versionfile_abs, "r")
+        for line in f.readlines():
+            if line.strip().startswith("git_refnames ="):
+                mo = re.search(r'=\s*"(.*)"', line)
+                if mo:
+                    keywords["refnames"] = mo.group(1)
+            if line.strip().startswith("git_full ="):
+                mo = re.search(r'=\s*"(.*)"', line)
+                if mo:
+                    keywords["full"] = mo.group(1)
+            if line.strip().startswith("git_date ="):
+                mo = re.search(r'=\s*"(.*)"', line)
+                if mo:
+                    keywords["date"] = mo.group(1)
+        f.close()
+    except EnvironmentError:
+        pass
+    return keywords
+
+
+ at register_vcs_handler("git", "keywords")
+def git_versions_from_keywords(keywords, tag_prefix, verbose):
+    """Get version information from git keywords."""
+    if not keywords:
+        raise NotThisMethod("no keywords at all, weird")
+    date = keywords.get("date")
+    if date is not None:
+        # git-2.2.0 added "%cI", which expands to an ISO-8601 -compliant
+        # datestamp. However we prefer "%ci" (which expands to an "ISO-8601
+        # -like" string, which we must then edit to make compliant), because
+        # it's been around since git-1.5.3, and it's too difficult to
+        # discover which version we're using, or to work around using an
+        # older one.
+        date = date.strip().replace(" ", "T", 1).replace(" ", "", 1)
+    refnames = keywords["refnames"].strip()
+    if refnames.startswith("$Format"):
+        if verbose:
+            print("keywords are unexpanded, not using")
+        raise NotThisMethod("unexpanded keywords, not a git-archive tarball")
+    refs = set([r.strip() for r in refnames.strip("()").split(",")])
+    # starting in git-1.8.3, tags are listed as "tag: foo-1.0" instead of
+    # just "foo-1.0". If we see a "tag: " prefix, prefer those.
+    TAG = "tag: "
+    tags = set([r[len(TAG):] for r in refs if r.startswith(TAG)])
+    if not tags:
+        # Either we're using git < 1.8.3, or there really are no tags. We use
+        # a heuristic: assume all version tags have a digit. The old git %d
+        # expansion behaves like git log --decorate=short and strips out the
+        # refs/heads/ and refs/tags/ prefixes that would let us distinguish
+        # between branches and tags. By ignoring refnames without digits, we
+        # filter out many common branch names like "release" and
+        # "stabilization", as well as "HEAD" and "master".
+        tags = set([r for r in refs if re.search(r'\d', r)])
+        if verbose:
+            print("discarding '%s', no digits" % ",".join(refs - tags))
+    if verbose:
+        print("likely tags: %s" % ",".join(sorted(tags)))
+    for ref in sorted(tags):
+        # sorting will prefer e.g. "2.0" over "2.0rc1"
+        if ref.startswith(tag_prefix):
+            r = ref[len(tag_prefix):]
+            if verbose:
+                print("picking %s" % r)
+            return {"version": r,
+                    "full-revisionid": keywords["full"].strip(),
+                    "dirty": False, "error": None,
+                    "date": date}
+    # no suitable tags, so version is "0+unknown", but full hex is still there
+    if verbose:
+        print("no suitable tags, using unknown + full revision id")
+    return {"version": "0+unknown",
+            "full-revisionid": keywords["full"].strip(),
+            "dirty": False, "error": "no suitable tags", "date": None}
+
+
+ at register_vcs_handler("git", "pieces_from_vcs")
+def git_pieces_from_vcs(tag_prefix, root, verbose, run_command=run_command):
+    """Get version from 'git describe' in the root of the source tree.
+
+    This only gets called if the git-archive 'subst' keywords were *not*
+    expanded, and _version.py hasn't already been rewritten with a short
+    version string, meaning we're inside a checked out source tree.
+    """
+    GITS = ["git"]
+    if sys.platform == "win32":
+        GITS = ["git.cmd", "git.exe"]
+
+    out, rc = run_command(GITS, ["rev-parse", "--git-dir"], cwd=root,
+                          hide_stderr=True)
+    if rc != 0:
+        if verbose:
+            print("Directory %s not under git control" % root)
+        raise NotThisMethod("'git rev-parse --git-dir' returned error")
+
+    # if there is a tag matching tag_prefix, this yields TAG-NUM-gHEX[-dirty]
+    # if there isn't one, this yields HEX[-dirty] (no NUM)
+    describe_out, rc = run_command(GITS, ["describe", "--tags", "--dirty",
+                                          "--always", "--long",
+                                          "--match", "%s*" % tag_prefix],
+                                   cwd=root)
+    # --long was added in git-1.5.5
+    if describe_out is None:
+        raise NotThisMethod("'git describe' failed")
+    describe_out = describe_out.strip()
+    full_out, rc = run_command(GITS, ["rev-parse", "HEAD"], cwd=root)
+    if full_out is None:
+        raise NotThisMethod("'git rev-parse' failed")
+    full_out = full_out.strip()
+
+    pieces = {}
+    pieces["long"] = full_out
+    pieces["short"] = full_out[:7]  # maybe improved later
+    pieces["error"] = None
+
+    # parse describe_out. It will be like TAG-NUM-gHEX[-dirty] or HEX[-dirty]
+    # TAG might have hyphens.
+    git_describe = describe_out
+
+    # look for -dirty suffix
+    dirty = git_describe.endswith("-dirty")
+    pieces["dirty"] = dirty
+    if dirty:
+        git_describe = git_describe[:git_describe.rindex("-dirty")]
+
+    # now we have TAG-NUM-gHEX or HEX
+
+    if "-" in git_describe:
+        # TAG-NUM-gHEX
+        mo = re.search(r'^(.+)-(\d+)-g([0-9a-f]+)$', git_describe)
+        if not mo:
+            # unparseable. Maybe git-describe is misbehaving?
+            pieces["error"] = ("unable to parse git-describe output: '%s'"
+                               % describe_out)
+            return pieces
+
+        # tag
+        full_tag = mo.group(1)
+        if not full_tag.startswith(tag_prefix):
+            if verbose:
+                fmt = "tag '%s' doesn't start with prefix '%s'"
+                print(fmt % (full_tag, tag_prefix))
+            pieces["error"] = ("tag '%s' doesn't start with prefix '%s'"
+                               % (full_tag, tag_prefix))
+            return pieces
+        pieces["closest-tag"] = full_tag[len(tag_prefix):]
+
+        # distance: number of commits since tag
+        pieces["distance"] = int(mo.group(2))
+
+        # commit: short hex revision ID
+        pieces["short"] = mo.group(3)
+
+    else:
+        # HEX: no tags
+        pieces["closest-tag"] = None
+        count_out, rc = run_command(GITS, ["rev-list", "HEAD", "--count"],
+                                    cwd=root)
+        pieces["distance"] = int(count_out)  # total number of commits
+
+    # commit date: see ISO-8601 comment in git_versions_from_keywords()
+    date = run_command(GITS, ["show", "-s", "--format=%ci", "HEAD"],
+                       cwd=root)[0].strip()
+    pieces["date"] = date.strip().replace(" ", "T", 1).replace(" ", "", 1)
+
+    return pieces
+
+
+def do_vcs_install(manifest_in, versionfile_source, ipy):
+    """Git-specific installation logic for Versioneer.
+
+    For Git, this means creating/changing .gitattributes to mark _version.py
+    for export-subst keyword substitution.
+    """
+    GITS = ["git"]
+    if sys.platform == "win32":
+        GITS = ["git.cmd", "git.exe"]
+    files = [manifest_in, versionfile_source]
+    if ipy:
+        files.append(ipy)
+    try:
+        me = __file__
+        if me.endswith(".pyc") or me.endswith(".pyo"):
+            me = os.path.splitext(me)[0] + ".py"
+        versioneer_file = os.path.relpath(me)
+    except NameError:
+        versioneer_file = "versioneer.py"
+    files.append(versioneer_file)
+    present = False
+    try:
+        f = open(".gitattributes", "r")
+        for line in f.readlines():
+            if line.strip().startswith(versionfile_source):
+                if "export-subst" in line.strip().split()[1:]:
+                    present = True
+        f.close()
+    except EnvironmentError:
+        pass
+    if not present:
+        f = open(".gitattributes", "a+")
+        f.write("%s export-subst\n" % versionfile_source)
+        f.close()
+        files.append(".gitattributes")
+    run_command(GITS, ["add", "--"] + files)
+
+
+def versions_from_parentdir(parentdir_prefix, root, verbose):
+    """Try to determine the version from the parent directory name.
+
+    Source tarballs conventionally unpack into a directory that includes both
+    the project name and a version string. We will also support searching up
+    two directory levels for an appropriately named parent directory
+    """
+    rootdirs = []
+
+    for i in range(3):
+        dirname = os.path.basename(root)
+        if dirname.startswith(parentdir_prefix):
+            return {"version": dirname[len(parentdir_prefix):],
+                    "full-revisionid": None,
+                    "dirty": False, "error": None, "date": None}
+        else:
+            rootdirs.append(root)
+            root = os.path.dirname(root)  # up a level
+
+    if verbose:
+        print("Tried directories %s but none started with prefix %s" %
+              (str(rootdirs), parentdir_prefix))
+    raise NotThisMethod("rootdir doesn't start with parentdir_prefix")
+
+
+SHORT_VERSION_PY = """
+# This file was generated by 'versioneer.py' (0.18) from
+# revision-control system data, or from the parent directory name of an
+# unpacked source archive. Distribution tarballs contain a pre-generated copy
+# of this file.
+
+import json
+
+version_json = '''
+%s
+'''  # END VERSION_JSON
+
+
+def get_versions():
+    return json.loads(version_json)
+"""
+
+
+def versions_from_file(filename):
+    """Try to determine the version from _version.py if present."""
+    try:
+        with open(filename) as f:
+            contents = f.read()
+    except EnvironmentError:
+        raise NotThisMethod("unable to read _version.py")
+    mo = re.search(r"version_json = '''\n(.*)'''  # END VERSION_JSON",
+                   contents, re.M | re.S)
+    if not mo:
+        mo = re.search(r"version_json = '''\r\n(.*)'''  # END VERSION_JSON",
+                       contents, re.M | re.S)
+    if not mo:
+        raise NotThisMethod("no version_json in _version.py")
+    return json.loads(mo.group(1))
+
+
+def write_to_version_file(filename, versions):
+    """Write the given version number to the given _version.py file."""
+    os.unlink(filename)
+    contents = json.dumps(versions, sort_keys=True,
+                          indent=1, separators=(",", ": "))
+    with open(filename, "w") as f:
+        f.write(SHORT_VERSION_PY % contents)
+
+    print("set %s to '%s'" % (filename, versions["version"]))
+
+
+def plus_or_dot(pieces):
+    """Return a + if we don't already have one, else return a ."""
+    if "+" in pieces.get("closest-tag", ""):
+        return "."
+    return "+"
+
+
+def render_pep440(pieces):
+    """Build up version string, with post-release "local version identifier".
+
+    Our goal: TAG[+DISTANCE.gHEX[.dirty]] . Note that if you
+    get a tagged build and then dirty it, you'll get TAG+0.gHEX.dirty
+
+    Exceptions:
+    1: no tags. git_describe was just HEX. 0+untagged.DISTANCE.gHEX[.dirty]
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"] or pieces["dirty"]:
+            rendered += plus_or_dot(pieces)
+            rendered += "%d.g%s" % (pieces["distance"], pieces["short"])
+            if pieces["dirty"]:
+                rendered += ".dirty"
+    else:
+        # exception #1
+        rendered = "0+untagged.%d.g%s" % (pieces["distance"],
+                                          pieces["short"])
+        if pieces["dirty"]:
+            rendered += ".dirty"
+    return rendered
+
+
+def render_pep440_pre(pieces):
+    """TAG[.post.devDISTANCE] -- No -dirty.
+
+    Exceptions:
+    1: no tags. 0.post.devDISTANCE
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"]:
+            rendered += ".post.dev%d" % pieces["distance"]
+    else:
+        # exception #1
+        rendered = "0.post.dev%d" % pieces["distance"]
+    return rendered
+
+
+def render_pep440_post(pieces):
+    """TAG[.postDISTANCE[.dev0]+gHEX] .
+
+    The ".dev0" means dirty. Note that .dev0 sorts backwards
+    (a dirty tree will appear "older" than the corresponding clean one),
+    but you shouldn't be releasing software with -dirty anyways.
+
+    Exceptions:
+    1: no tags. 0.postDISTANCE[.dev0]
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"] or pieces["dirty"]:
+            rendered += ".post%d" % pieces["distance"]
+            if pieces["dirty"]:
+                rendered += ".dev0"
+            rendered += plus_or_dot(pieces)
+            rendered += "g%s" % pieces["short"]
+    else:
+        # exception #1
+        rendered = "0.post%d" % pieces["distance"]
+        if pieces["dirty"]:
+            rendered += ".dev0"
+        rendered += "+g%s" % pieces["short"]
+    return rendered
+
+
+def render_pep440_old(pieces):
+    """TAG[.postDISTANCE[.dev0]] .
+
+    The ".dev0" means dirty.
+
+    Eexceptions:
+    1: no tags. 0.postDISTANCE[.dev0]
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"] or pieces["dirty"]:
+            rendered += ".post%d" % pieces["distance"]
+            if pieces["dirty"]:
+                rendered += ".dev0"
+    else:
+        # exception #1
+        rendered = "0.post%d" % pieces["distance"]
+        if pieces["dirty"]:
+            rendered += ".dev0"
+    return rendered
+
+
+def render_git_describe(pieces):
+    """TAG[-DISTANCE-gHEX][-dirty].
+
+    Like 'git describe --tags --dirty --always'.
+
+    Exceptions:
+    1: no tags. HEX[-dirty]  (note: no 'g' prefix)
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"]:
+            rendered += "-%d-g%s" % (pieces["distance"], pieces["short"])
+    else:
+        # exception #1
+        rendered = pieces["short"]
+    if pieces["dirty"]:
+        rendered += "-dirty"
+    return rendered
+
+
+def render_git_describe_long(pieces):
+    """TAG-DISTANCE-gHEX[-dirty].
+
+    Like 'git describe --tags --dirty --always -long'.
+    The distance/hash is unconditional.
+
+    Exceptions:
+    1: no tags. HEX[-dirty]  (note: no 'g' prefix)
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        rendered += "-%d-g%s" % (pieces["distance"], pieces["short"])
+    else:
+        # exception #1
+        rendered = pieces["short"]
+    if pieces["dirty"]:
+        rendered += "-dirty"
+    return rendered
+
+
+def render(pieces, style):
+    """Render the given version pieces into the requested style."""
+    if pieces["error"]:
+        return {"version": "unknown",
+                "full-revisionid": pieces.get("long"),
+                "dirty": None,
+                "error": pieces["error"],
+                "date": None}
+
+    if not style or style == "default":
+        style = "pep440"  # the default
+
+    if style == "pep440":
+        rendered = render_pep440(pieces)
+    elif style == "pep440-pre":
+        rendered = render_pep440_pre(pieces)
+    elif style == "pep440-post":
+        rendered = render_pep440_post(pieces)
+    elif style == "pep440-old":
+        rendered = render_pep440_old(pieces)
+    elif style == "git-describe":
+        rendered = render_git_describe(pieces)
+    elif style == "git-describe-long":
+        rendered = render_git_describe_long(pieces)
+    else:
+        raise ValueError("unknown style '%s'" % style)
+
+    return {"version": rendered, "full-revisionid": pieces["long"],
+            "dirty": pieces["dirty"], "error": None,
+            "date": pieces.get("date")}
+
+
+class VersioneerBadRootError(Exception):
+    """The project root directory is unknown or missing key files."""
+
+
+def get_versions(verbose=False):
+    """Get the project version from whatever source is available.
+
+    Returns dict with two keys: 'version' and 'full'.
+    """
+    if "versioneer" in sys.modules:
+        # see the discussion in cmdclass.py:get_cmdclass()
+        del sys.modules["versioneer"]
+
+    root = get_root()
+    cfg = get_config_from_root(root)
+
+    assert cfg.VCS is not None, "please set [versioneer]VCS= in setup.cfg"
+    handlers = HANDLERS.get(cfg.VCS)
+    assert handlers, "unrecognized VCS '%s'" % cfg.VCS
+    verbose = verbose or cfg.verbose
+    assert cfg.versionfile_source is not None, \
+        "please set versioneer.versionfile_source"
+    assert cfg.tag_prefix is not None, "please set versioneer.tag_prefix"
+
+    versionfile_abs = os.path.join(root, cfg.versionfile_source)
+
+    # extract version from first of: _version.py, VCS command (e.g. 'git
+    # describe'), parentdir. This is meant to work for developers using a
+    # source checkout, for users of a tarball created by 'setup.py sdist',
+    # and for users of a tarball/zipball created by 'git archive' or github's
+    # download-from-tag feature or the equivalent in other VCSes.
+
+    get_keywords_f = handlers.get("get_keywords")
+    from_keywords_f = handlers.get("keywords")
+    if get_keywords_f and from_keywords_f:
+        try:
+            keywords = get_keywords_f(versionfile_abs)
+            ver = from_keywords_f(keywords, cfg.tag_prefix, verbose)
+            if verbose:
+                print("got version from expanded keyword %s" % ver)
+            return ver
+        except NotThisMethod:
+            pass
+
+    try:
+        ver = versions_from_file(versionfile_abs)
+        if verbose:
+            print("got version from file %s %s" % (versionfile_abs, ver))
+        return ver
+    except NotThisMethod:
+        pass
+
+    from_vcs_f = handlers.get("pieces_from_vcs")
+    if from_vcs_f:
+        try:
+            pieces = from_vcs_f(cfg.tag_prefix, root, verbose)
+            ver = render(pieces, cfg.style)
+            if verbose:
+                print("got version from VCS %s" % ver)
+            return ver
+        except NotThisMethod:
+            pass
+
+    try:
+        if cfg.parentdir_prefix:
+            ver = versions_from_parentdir(cfg.parentdir_prefix, root, verbose)
+            if verbose:
+                print("got version from parentdir %s" % ver)
+            return ver
+    except NotThisMethod:
+        pass
+
+    if verbose:
+        print("unable to compute version")
+
+    return {"version": "0+unknown", "full-revisionid": None,
+            "dirty": None, "error": "unable to compute version",
+            "date": None}
+
+
+def get_version():
+    """Get the short version string for this project."""
+    return get_versions()["version"]
+
+
+def get_cmdclass():
+    """Get the custom setuptools/distutils subclasses used by Versioneer."""
+    if "versioneer" in sys.modules:
+        del sys.modules["versioneer"]
+        # this fixes the "python setup.py develop" case (also 'install' and
+        # 'easy_install .'), in which subdependencies of the main project are
+        # built (using setup.py bdist_egg) in the same python process. Assume
+        # a main project A and a dependency B, which use different versions
+        # of Versioneer. A's setup.py imports A's Versioneer, leaving it in
+        # sys.modules by the time B's setup.py is executed, causing B to run
+        # with the wrong versioneer. Setuptools wraps the sub-dep builds in a
+        # sandbox that restores sys.modules to it's pre-build state, so the
+        # parent is protected against the child's "import versioneer". By
+        # removing ourselves from sys.modules here, before the child build
+        # happens, we protect the child from the parent's versioneer too.
+        # Also see https://github.com/warner/python-versioneer/issues/52
+
+    cmds = {}
+
+    # we add "version" to both distutils and setuptools
+    from distutils.core import Command
+
+    class cmd_version(Command):
+        description = "report generated version string"
+        user_options = []
+        boolean_options = []
+
+        def initialize_options(self):
+            pass
+
+        def finalize_options(self):
+            pass
+
+        def run(self):
+            vers = get_versions(verbose=True)
+            print("Version: %s" % vers["version"])
+            print(" full-revisionid: %s" % vers.get("full-revisionid"))
+            print(" dirty: %s" % vers.get("dirty"))
+            print(" date: %s" % vers.get("date"))
+            if vers["error"]:
+                print(" error: %s" % vers["error"])
+    cmds["version"] = cmd_version
+
+    # we override "build_py" in both distutils and setuptools
+    #
+    # most invocation pathways end up running build_py:
+    #  distutils/build -> build_py
+    #  distutils/install -> distutils/build ->..
+    #  setuptools/bdist_wheel -> distutils/install ->..
+    #  setuptools/bdist_egg -> distutils/install_lib -> build_py
+    #  setuptools/install -> bdist_egg ->..
+    #  setuptools/develop -> ?
+    #  pip install:
+    #   copies source tree to a tempdir before running egg_info/etc
+    #   if .git isn't copied too, 'git describe' will fail
+    #   then does setup.py bdist_wheel, or sometimes setup.py install
+    #  setup.py egg_info -> ?
+
+    # we override different "build_py" commands for both environments
+    if "setuptools" in sys.modules:
+        from setuptools.command.build_py import build_py as _build_py
+    else:
+        from distutils.command.build_py import build_py as _build_py
+
+    class cmd_build_py(_build_py):
+        def run(self):
+            root = get_root()
+            cfg = get_config_from_root(root)
+            versions = get_versions()
+            _build_py.run(self)
+            # now locate _version.py in the new build/ directory and replace
+            # it with an updated value
+            if cfg.versionfile_build:
+                target_versionfile = os.path.join(self.build_lib,
+                                                  cfg.versionfile_build)
+                print("UPDATING %s" % target_versionfile)
+                write_to_version_file(target_versionfile, versions)
+    cmds["build_py"] = cmd_build_py
+
+    if "cx_Freeze" in sys.modules:  # cx_freeze enabled?
+        from cx_Freeze.dist import build_exe as _build_exe
+        # nczeczulin reports that py2exe won't like the pep440-style string
+        # as FILEVERSION, but it can be used for PRODUCTVERSION, e.g.
+        # setup(console=[{
+        #   "version": versioneer.get_version().split("+", 1)[0], # FILEVERSION
+        #   "product_version": versioneer.get_version(),
+        #   ...
+
+        class cmd_build_exe(_build_exe):
+            def run(self):
+                root = get_root()
+                cfg = get_config_from_root(root)
+                versions = get_versions()
+                target_versionfile = cfg.versionfile_source
+                print("UPDATING %s" % target_versionfile)
+                write_to_version_file(target_versionfile, versions)
+
+                _build_exe.run(self)
+                os.unlink(target_versionfile)
+                with open(cfg.versionfile_source, "w") as f:
+                    LONG = LONG_VERSION_PY[cfg.VCS]
+                    f.write(LONG %
+                            {"DOLLAR": "$",
+                             "STYLE": cfg.style,
+                             "TAG_PREFIX": cfg.tag_prefix,
+                             "PARENTDIR_PREFIX": cfg.parentdir_prefix,
+                             "VERSIONFILE_SOURCE": cfg.versionfile_source,
+                             })
+        cmds["build_exe"] = cmd_build_exe
+        del cmds["build_py"]
+
+    if 'py2exe' in sys.modules:  # py2exe enabled?
+        try:
+            from py2exe.distutils_buildexe import py2exe as _py2exe  # py3
+        except ImportError:
+            from py2exe.build_exe import py2exe as _py2exe  # py2
+
+        class cmd_py2exe(_py2exe):
+            def run(self):
+                root = get_root()
+                cfg = get_config_from_root(root)
+                versions = get_versions()
+                target_versionfile = cfg.versionfile_source
+                print("UPDATING %s" % target_versionfile)
+                write_to_version_file(target_versionfile, versions)
+
+                _py2exe.run(self)
+                os.unlink(target_versionfile)
+                with open(cfg.versionfile_source, "w") as f:
+                    LONG = LONG_VERSION_PY[cfg.VCS]
+                    f.write(LONG %
+                            {"DOLLAR": "$",
+                             "STYLE": cfg.style,
+                             "TAG_PREFIX": cfg.tag_prefix,
+                             "PARENTDIR_PREFIX": cfg.parentdir_prefix,
+                             "VERSIONFILE_SOURCE": cfg.versionfile_source,
+                             })
+        cmds["py2exe"] = cmd_py2exe
+
+    # we override different "sdist" commands for both environments
+    if "setuptools" in sys.modules:
+        from setuptools.command.sdist import sdist as _sdist
+    else:
+        from distutils.command.sdist import sdist as _sdist
+
+    class cmd_sdist(_sdist):
+        def run(self):
+            versions = get_versions()
+            self._versioneer_generated_versions = versions
+            # unless we update this, the command will keep using the old
+            # version
+            self.distribution.metadata.version = versions["version"]
+            return _sdist.run(self)
+
+        def make_release_tree(self, base_dir, files):
+            root = get_root()
+            cfg = get_config_from_root(root)
+            _sdist.make_release_tree(self, base_dir, files)
+            # now locate _version.py in the new base_dir directory
+            # (remembering that it may be a hardlink) and replace it with an
+            # updated value
+            target_versionfile = os.path.join(base_dir, cfg.versionfile_source)
+            print("UPDATING %s" % target_versionfile)
+            write_to_version_file(target_versionfile,
+                                  self._versioneer_generated_versions)
+    cmds["sdist"] = cmd_sdist
+
+    return cmds
+
+
+CONFIG_ERROR = """
+setup.cfg is missing the necessary Versioneer configuration. You need
+a section like:
+
+ [versioneer]
+ VCS = git
+ style = pep440
+ versionfile_source = src/myproject/_version.py
+ versionfile_build = myproject/_version.py
+ tag_prefix =
+ parentdir_prefix = myproject-
+
+You will also need to edit your setup.py to use the results:
+
+ import versioneer
+ setup(version=versioneer.get_version(),
+       cmdclass=versioneer.get_cmdclass(), ...)
+
+Please read the docstring in ./versioneer.py for configuration instructions,
+edit setup.cfg, and re-run the installer or 'python versioneer.py setup'.
+"""
+
+SAMPLE_CONFIG = """
+# See the docstring in versioneer.py for instructions. Note that you must
+# re-run 'versioneer.py setup' after changing this section, and commit the
+# resulting files.
+
+[versioneer]
+#VCS = git
+#style = pep440
+#versionfile_source =
+#versionfile_build =
+#tag_prefix =
+#parentdir_prefix =
+
+"""
+
+INIT_PY_SNIPPET = """
+from ._version import get_versions
+__version__ = get_versions()['version']
+del get_versions
+"""
+
+
+def do_setup():
+    """Main VCS-independent setup function for installing Versioneer."""
+    root = get_root()
+    try:
+        cfg = get_config_from_root(root)
+    except (EnvironmentError, configparser.NoSectionError,
+            configparser.NoOptionError) as e:
+        if isinstance(e, (EnvironmentError, configparser.NoSectionError)):
+            print("Adding sample versioneer config to setup.cfg",
+                  file=sys.stderr)
+            with open(os.path.join(root, "setup.cfg"), "a") as f:
+                f.write(SAMPLE_CONFIG)
+        print(CONFIG_ERROR, file=sys.stderr)
+        return 1
+
+    print(" creating %s" % cfg.versionfile_source)
+    with open(cfg.versionfile_source, "w") as f:
+        LONG = LONG_VERSION_PY[cfg.VCS]
+        f.write(LONG % {"DOLLAR": "$",
+                        "STYLE": cfg.style,
+                        "TAG_PREFIX": cfg.tag_prefix,
+                        "PARENTDIR_PREFIX": cfg.parentdir_prefix,
+                        "VERSIONFILE_SOURCE": cfg.versionfile_source,
+                        })
+
+    ipy = os.path.join(os.path.dirname(cfg.versionfile_source),
+                       "__init__.py")
+    if os.path.exists(ipy):
+        try:
+            with open(ipy, "r") as f:
+                old = f.read()
+        except EnvironmentError:
+            old = ""
+        if INIT_PY_SNIPPET not in old:
+            print(" appending to %s" % ipy)
+            with open(ipy, "a") as f:
+                f.write(INIT_PY_SNIPPET)
+        else:
+            print(" %s unmodified" % ipy)
+    else:
+        print(" %s doesn't exist, ok" % ipy)
+        ipy = None
+
+    # Make sure both the top-level "versioneer.py" and versionfile_source
+    # (PKG/_version.py, used by runtime code) are in MANIFEST.in, so
+    # they'll be copied into source distributions. Pip won't be able to
+    # install the package without this.
+    manifest_in = os.path.join(root, "MANIFEST.in")
+    simple_includes = set()
+    try:
+        with open(manifest_in, "r") as f:
+            for line in f:
+                if line.startswith("include "):
+                    for include in line.split()[1:]:
+                        simple_includes.add(include)
+    except EnvironmentError:
+        pass
+    # That doesn't cover everything MANIFEST.in can do
+    # (http://docs.python.org/2/distutils/sourcedist.html#commands), so
+    # it might give some false negatives. Appending redundant 'include'
+    # lines is safe, though.
+    if "versioneer.py" not in simple_includes:
+        print(" appending 'versioneer.py' to MANIFEST.in")
+        with open(manifest_in, "a") as f:
+            f.write("include versioneer.py\n")
+    else:
+        print(" 'versioneer.py' already in MANIFEST.in")
+    if cfg.versionfile_source not in simple_includes:
+        print(" appending versionfile_source ('%s') to MANIFEST.in" %
+              cfg.versionfile_source)
+        with open(manifest_in, "a") as f:
+            f.write("include %s\n" % cfg.versionfile_source)
+    else:
+        print(" versionfile_source already in MANIFEST.in")
+
+    # Make VCS-specific changes. For git, this means creating/changing
+    # .gitattributes to mark _version.py for export-subst keyword
+    # substitution.
+    do_vcs_install(manifest_in, cfg.versionfile_source, ipy)
+    return 0
+
+
+def scan_setup_py():
+    """Validate the contents of setup.py against Versioneer's expectations."""
+    found = set()
+    setters = False
+    errors = 0
+    with open("setup.py", "r") as f:
+        for line in f.readlines():
+            if "import versioneer" in line:
+                found.add("import")
+            if "versioneer.get_cmdclass()" in line:
+                found.add("cmdclass")
+            if "versioneer.get_version()" in line:
+                found.add("get_version")
+            if "versioneer.VCS" in line:
+                setters = True
+            if "versioneer.versionfile_source" in line:
+                setters = True
+    if len(found) != 3:
+        print("")
+        print("Your setup.py appears to be missing some important items")
+        print("(but I might be wrong). Please make sure it has something")
+        print("roughly like the following:")
+        print("")
+        print(" import versioneer")
+        print(" setup( version=versioneer.get_version(),")
+        print("        cmdclass=versioneer.get_cmdclass(),  ...)")
+        print("")
+        errors += 1
+    if setters:
+        print("You should remove lines like 'versioneer.VCS = ' and")
+        print("'versioneer.versionfile_source = ' . This configuration")
+        print("now lives in setup.cfg, and should be removed from setup.py")
+        print("")
+        errors += 1
+    return errors
+
+
+if __name__ == "__main__":
+    cmd = sys.argv[1]
+    if cmd == "setup":
+        errors = do_setup()
+        errors += scan_setup_py()
+        if errors:
+            sys.exit(1)



View it on GitLab: https://salsa.debian.org/debian-gis-team/trollimage/commit/a90c409f998444577af69923e1f4b9484c02f70c

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View it on GitLab: https://salsa.debian.org/debian-gis-team/trollimage/commit/a90c409f998444577af69923e1f4b9484c02f70c
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