A Gulp plugin to execute functions within a Gulp task pipeline.
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gulp-function

accepts call to execute in gulp pipeline.

Availabililty

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Status for master

build status coverage report Dependency Status bitHound Dependencies bitHound Code TypeScript node JavaScript Style Guide

Usage

import * as gulp from 'gulp';
import gulpFunction from 'gulp-function' // default ES6 export
// import {forFirst, forEach, atEnd} from 'gulp-function'
let Q = require("q");

let myFunction = function (file, enc) { // file and enc are optional in case you want to modify the file object
    let done = Q.defer();
    console.log("Hello World!")
    
    // NOTE:
    // you can use done.resolve as callback function
    // of any async tasks within this function
    done.resolve();
    
    return done.promise;
}

gulp.task('gulpTest',function() {
    let stream = gulp.src('./mydir/*.something')
        .pipe(gulpFunction(myFunction,'forEach')) //read the notes below
        // .pipe(gulpFunction.forEach(myFunction))
        .pipe(gulp.dest("./build/"));
    return stream; // by returning the stream gulp knows when our task has finished.
});

Notes:

  • The first argument of gulpFunction can also be an array of multiple functionnames. Each function can return a promise. The pipe stop will finish when every promise is fullfilled. When providing an array of functions be careful with modifying the file object -> race condition
  • The second argument can be empty, it defaults to "forEach"
  • The following options are available:
    • "forFirst" - executes when first chunk/vinylfile of the stream reaches the pipestop. file is pushed further down the line when function's returned promise is fullfilled.
    • "forEach" - executes like "forFirst" but with every chunk/vinylfile in the stream;
    • "atEnd" - executes after all chunks have passed and are processed in full. That means the stream's "finish" event fires before "atLast" is executed!!!

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