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alteholz pushed a commit to branch master
in repository node-wrappy.
commit 7d606cf6c46326a004e0e2502b395f36d6f95179
Author: Thorsten Alteholz <debian at alteholz.de>
Date: Thu Feb 4 21:55:37 2016 +0100
Imported Upstream version 1.0.1
---
LICENSE | 15 +++++++++++++++
README.md | 36 ++++++++++++++++++++++++++++++++++++
package.json | 26 ++++++++++++++++++++++++++
test/basic.js | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
wrappy.js | 33 +++++++++++++++++++++++++++++++++
5 files changed, 161 insertions(+)
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..19129e3
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,15 @@
+The ISC License
+
+Copyright (c) Isaac Z. Schlueter and Contributors
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..98eab25
--- /dev/null
+++ b/README.md
@@ -0,0 +1,36 @@
+# wrappy
+
+Callback wrapping utility
+
+## USAGE
+
+```javascript
+var wrappy = require("wrappy")
+
+// var wrapper = wrappy(wrapperFunction)
+
+// make sure a cb is called only once
+// See also: http://npm.im/once for this specific use case
+var once = wrappy(function (cb) {
+ var called = false
+ return function () {
+ if (called) return
+ called = true
+ return cb.apply(this, arguments)
+ }
+})
+
+function printBoo () {
+ console.log('boo')
+}
+// has some rando property
+printBoo.iAmBooPrinter = true
+
+var onlyPrintOnce = once(printBoo)
+
+onlyPrintOnce() // prints 'boo'
+onlyPrintOnce() // does nothing
+
+// random property is retained!
+assert.equal(onlyPrintOnce.iAmBooPrinter, true)
+```
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..0f1b814
--- /dev/null
+++ b/package.json
@@ -0,0 +1,26 @@
+{
+ "name": "wrappy",
+ "version": "1.0.1",
+ "description": "Callback wrapping utility",
+ "main": "wrappy.js",
+ "directories": {
+ "test": "test"
+ },
+ "dependencies": {},
+ "devDependencies": {
+ "tap": "^0.4.12"
+ },
+ "scripts": {
+ "test": "tap test/*.js"
+ },
+ "repository": {
+ "type": "git",
+ "url": "https://github.com/npm/wrappy"
+ },
+ "author": "Isaac Z. Schlueter <i at izs.me> (http://blog.izs.me/)",
+ "license": "ISC",
+ "bugs": {
+ "url": "https://github.com/npm/wrappy/issues"
+ },
+ "homepage": "https://github.com/npm/wrappy"
+}
diff --git a/test/basic.js b/test/basic.js
new file mode 100644
index 0000000..5ed0fcd
--- /dev/null
+++ b/test/basic.js
@@ -0,0 +1,51 @@
+var test = require('tap').test
+var wrappy = require('../wrappy.js')
+
+test('basic', function (t) {
+ function onceifier (cb) {
+ var called = false
+ return function () {
+ if (called) return
+ called = true
+ return cb.apply(this, arguments)
+ }
+ }
+ onceifier.iAmOnce = {}
+ var once = wrappy(onceifier)
+ t.equal(once.iAmOnce, onceifier.iAmOnce)
+
+ var called = 0
+ function boo () {
+ t.equal(called, 0)
+ called++
+ }
+ // has some rando property
+ boo.iAmBoo = true
+
+ var onlyPrintOnce = once(boo)
+
+ onlyPrintOnce() // prints 'boo'
+ onlyPrintOnce() // does nothing
+ t.equal(called, 1)
+
+ // random property is retained!
+ t.equal(onlyPrintOnce.iAmBoo, true)
+
+ var logs = []
+ var logwrap = wrappy(function (msg, cb) {
+ logs.push(msg + ' wrapping cb')
+ return function () {
+ logs.push(msg + ' before cb')
+ var ret = cb.apply(this, arguments)
+ logs.push(msg + ' after cb')
+ }
+ })
+
+ var c = logwrap('foo', function () {
+ t.same(logs, [ 'foo wrapping cb', 'foo before cb' ])
+ })
+ c()
+ t.same(logs, [ 'foo wrapping cb', 'foo before cb', 'foo after cb' ])
+
+ t.end()
+})
diff --git a/wrappy.js b/wrappy.js
new file mode 100644
index 0000000..bb7e7d6
--- /dev/null
+++ b/wrappy.js
@@ -0,0 +1,33 @@
+// Returns a wrapper function that returns a wrapped callback
+// The wrapper function should do some stuff, and return a
+// presumably different callback function.
+// This makes sure that own properties are retained, so that
+// decorations and such are not lost along the way.
+module.exports = wrappy
+function wrappy (fn, cb) {
+ if (fn && cb) return wrappy(fn)(cb)
+
+ if (typeof fn !== 'function')
+ throw new TypeError('need wrapper function')
+
+ Object.keys(fn).forEach(function (k) {
+ wrapper[k] = fn[k]
+ })
+
+ return wrapper
+
+ function wrapper() {
+ var args = new Array(arguments.length)
+ for (var i = 0; i < args.length; i++) {
+ args[i] = arguments[i]
+ }
+ var ret = fn.apply(this, args)
+ var cb = args[args.length-1]
+ if (typeof ret === 'function' && ret !== cb) {
+ Object.keys(cb).forEach(function (k) {
+ ret[k] = cb[k]
+ })
+ }
+ return ret
+ }
+}
--
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