51 lines
2.4 KiB
Markdown
51 lines
2.4 KiB
Markdown
# gulp-function
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accepts call to execute in gulp pipeline.
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### Status
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[](https://travis-ci.org/pushrocks/gulp-function)
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[](https://david-dm.org/pushrocks/gulp-function)
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[](https://www.bithound.io/github/pushrocks/gulp-function/master/dependencies/npm)
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[](https://www.bithound.io/github/pushrocks/gulp-function)
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[](https://codecov.io/github/pushrocks/gulp-function?branch=master)
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### Version
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[](https://badge.fury.io/gh/pushrocks%2Fgulp-function)
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[](https://badge.fury.io/js/gulp-function)
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### Usage
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```javascript
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var gulp = require("gulp");
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var gulpFunction = require("gulp-function");
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var Q = require("q");
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var myFunction = function () {
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var done = Q.defer();
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console.log("Hello World!")
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// NOTE:
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// you can use done.resolve as callback function
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// of any async tasks within this function
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done.resolve();
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return done.promise;
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}
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gulp.task('gulpTest',function() {
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var stream = gulp.src('./mydir/*.something')
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.pipe(gulpFunction(myFunction,'forEach')) //read the notes below
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.pipe(gulp.dest("./build/"));
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return stream; // by returning the stream gulp knows when our task has finished.
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});
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```
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### Notes:
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* The first argument of gulpFunction can also be an **array of multiple functionnames**.
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Each function can return a promise. the pipe stop will finish when every promise is fullfilled.
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* the second argument can be empty, it defaults to "forEach"
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* the following options are available:
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* "forFirst" - executes when first chunk/vinylfile of the stream reaches the pipestop.
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file is pushed further down the line when function's returned promise is fullfilled.
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* "forEach" - executes like "forFirst" but with every chunk/vinylfile in the stream;
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* "atEnd" - executes after all chunks have passed and are processed in full.
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That means the stream's "finish" event fires **before "atLast" is executed**!!! |