wait for pipeline to finish

I am struggling a little to create a reference to a collection of files as a parameter to a plugin in another pipeline. I am not sure which way to go:

Gulp.task('collection', function() {

  return Gulp.src('some/**/*.md')
    .pipe($.frontmatter());

});

Gulp.task('templates', [ 'collection' ], function() {

  var other = Gulp.src('other/**/*.md')
    .pipe($.template({
      collection: -> reference to the finished collection
    }))

  ...
});

or better

Gulp.task('templates', [ 'collection' ], function() {

  var collection = Gulp.src('some/**/*.md')
    .pipe($.frontmatter());

  var other = Gulp.src('other/**/*.md')
    .pipe($.template({
      collection: -> reference to the finished collection
    }))

  ...
});

I would love to do this in a single task but given the pipeline architecture that doesn’t seem so easy. Any pointers much appreciated.

[TrySound]

@tcurdt

gulp.task('task', function () {
  return Promise.all([
    new Promise(function(resolve, reject) {
      gulp.src(src + '/*.md')
        .pipe(plugin())
        .on('error', reject)
        .pipe(gulp.dest(dist))
        .on('end', resolve)
    }),
    new Promise(function(resolve, reject) {
      gulp.src(src + '/*.md')
        .pipe(plugin())
        .on('error', reject)
        .pipe(gulp.dest(dist))
        .on('end', resolve)
    })
  ]).then(function () {
    // Other actions
  });
});

[tcurdt]

@TrySound oh - that easy?

I thought that only returning a pipeline would run it. What runs the pipeline like this? Doesn’t gulp.src().pipe().pipe().on() just create the pipeline?

Doesn’t it need to be

gulp.task('task', function () {

  var collection;

  return Promise.all([
    new Promise(function(resolve, reject) {
      collection = gulp.src(src + '/*.md')
        .pipe(plugin())
        .on('error', reject)
        .pipe(gulp.dest(dist))
        .on('end', resolve)
    })
  ]).then(function () {

    var other = Gulp.src('other/**/*.md')
      .pipe($.template({
        collection: -> reference to the finished collection
      }))

    return merge(collection, other);

  });
});