Compare different file set from the source file

[ltvan]

I recently come to same issue as #16, but my suggestion is a litte bit different. It should have an option so that gulp-newer can check a different file set like this:

gulp.task('less', function() {
  return gulp.src('lib/a.less')
    .pipe(newer({ src: 'lib/includes/**/*.less', dest: 'dist/a.css'))
    .pipe(less())
    .pipe(gulp.dest('dist'));
});

[ltvan]

Sorry, it seems that I miss the option.extra. It does the work.

[grigorii-horos]

@ltvan @tschaub In my case it does not work

  gulp.src('src/public/less/main.less')
  .pipe(newer({
    dest: 'dest/public/css/main.css',
    extra: 'src/public/less/**'
  }))
  .pipe(less())
  .pipe(gulp.dest('./dist/public/css/'))

After each run gulp, he rebuilds main.less

[ltvan]

You compare with wrong file: dist vs dest.

[grigorii-horos]

@ltvan @tschaub No, my original gulpfile.js is correct, error only in this snippet. But I found error. For example you have follow file structure

src/main.less
src/variables/colors.less
dest/

For example, you changed main.less at 00:00, and run gulp at 00:01, they build source to dest/. Mtime for dest/main.css will be not 00:01, it will be 00:00, because gulp.dest copy mtime of main.less.

And now, if you change colors.less at 00:02, and run gulp, gulp will compile source, because mtime of main.css - 00:00 is smaller than mtime of colors.less - 00:02. And if you run gulp again, it will compile sources again, because mtime of main.css - 00:00 is smaller than mtime of colors.less - 00:02 .

But, you can resolve error using gulp-touch,

 gulp.src('src/main.less')
    .pipe(newer({
      extra: [
        'src/variables/*.less'
      ],
      dest: 'dest/main.css'
    }))
    .pipe(less())
    .pipe(gulp.dest('dist/'))
    .pipe(touch())

Now, mtime of main.css will be bigger than mtime of main.less

[ltvan]

Not sure why you get this error, because in my case, the mtime of css file is always the latest at time of gulp run:

 return gulp.src(paths.lessFiles)
    .pipe(plumber(done))
    .pipe(newer({ dest: paths.lessDest, ext: '.min.css', extra: paths.lessWatchFiles }))
    .pipe(less())
    .pipe(autoprefixer('last 2 version'))
    .pipe(gulpif(release, cleanCss()))
    .pipe(rename({ suffix: '.min' }))
    .pipe(gulp.dest(paths.lessDest))