Theoretical question about forking a stream in gulp

Hey there. I’m relatively new to gulp and streams but I have the following situation. I have two pipelines A and B where A and B both have 5 steps in the pipeline where the first 3 are the same. Theoretically and from an efficiency standpoint it would make sense to use the same pipeline for the first 3 steps and then fork the pipeline into two separate ones.

I’d think of something like this:

gulp.src('./src/*.js')
  .pipe(sharedOne())
  .pipe(sharedTwo())
  .pipe(sharedThree())
  .pipe(gulp.fork(function(a, b) {
    return eventStream.merge(
      a.pipe(aOne()).pipe(aTwo()),
      b.pipe(bOne()).pipe(bTwo())
    );
  }));

I’m sorry if I don’t make any sense or if there is already a known stream utility like this but as I sad I’m relatively new to this.

Any help would be much appreciated.

[heikki]

gulp-clone

var gulp = require('gulp');
var clone = require('gulp-clone');
var es = require('event-stream');
var concat = require('gulp-concat');
var rename = require('gulp-rename');

gulp.task('clone', function() {
    var all = gulp.src('src/**/*.js').pipe(concat('all.js'));
    var a = all.pipe(clone()).pipe(rename('browser.js'));
    var b = all.pipe(clone()).pipe(rename('common.js'));
    return es.merge(a, b).pipe(gulp.dest('dest'));
});

gulp-mirror

var gulp = require('gulp');
var mirror = require('gulp-mirror');
var concat = require('gulp-concat');
var rename = require('gulp-rename');

gulp.task('mirror', function() {
    return gulp.src('src/**/*.js')
        .pipe(concat('all.js'))
        .pipe(mirror(
            rename('browser.js'),
            rename('common.js')
        ))
        .pipe(gulp.dest('dest'));
});

–edit

Fixed gulp-mirror example (maybe)

[gionkunz]

A repository with a README containing known and useful streaming modules would be awesome… It’s so hard to find the right terminology for such abstract problems.