gulp-filter

Filter files in a vinyl stream

Enables you to work on a subset of the original files by filtering them using globbing. When you're done and want all the original files back you just use the restore stream.

Install

$ npm install --save-dev gulp-filter

Usage

Filter only

You may want to just filter the stream content:

const gulp = require('gulp');
const uglify = require('gulp-uglify');
const filter = require('gulp-filter');

gulp.task('default', () => {
	// create filter instance inside task function
	const f = filter(['*', '!src/vendor']);

	return gulp.src('src/*.js')
		// filter a subset of the files
		.pipe(f)
		// run them through a plugin
		.pipe(uglify())
		.pipe(gulp.dest('dist'));
});

Restoring filtered files

const gulp = require('gulp');
const uglify = require('gulp-uglify');
const filter = require('gulp-filter');

gulp.task('default', () => {
	// create filter instance inside task function
	const f = filter(['*', '!src/vendor'], {restore: true});

	return gulp.src('src/*.js')
		// filter a subset of the files
		.pipe(f)
		// run them through a plugin
		.pipe(uglify())
		// bring back the previously filtered out files (optional)
		.pipe(f.restore)
		.pipe(gulp.dest('dist'));
});

Multiple filters

By combining and restoring different filters you can process different sets of files with a single pipeline.

const gulp = require('gulp');
const less = require('gulp-less');
const concat = require('gulp-concat');
const filter = require('gulp-filter');

gulp.task('default', () => {
	const jsFilter = filter('**/*.js', {restore: true});
	const lessFilter = filter('**/*.less', {restore: true});

	return gulp.src('assets/**')
		.pipe(jsFilter)
		.pipe(concat('bundle.js'))
		.pipe(jsFilter.restore)
		.pipe(lessFilter)
		.pipe(less())
		.pipe(lessFilter.restore)
		.pipe(gulp.dest('out/'));
});

Restore as a file source

You can restore filtered files in a different place and use it as a standalone source of files (ReadableStream). Setting the passthrough option to false allows you to do so.

const gulp = require('gulp');
const uglify = require('gulp-uglify');
const filter = require('gulp-filter');

gulp.task('default', () => {
	const f = filter(['*', '!src/vendor'], {restore: true, passthrough: false});

	const stream = gulp.src('src/*.js')
		// filter a subset of the files
		.pipe(f)
		// run them through a plugin
		.pipe(uglify())
		.pipe(gulp.dest('dist'));

	// use filtered files as a gulp file source
	f.restore.pipe(gulp.dest('vendor-dist'));

	return stream;
});

API

filter(pattern, [options])

Returns a transform stream with a .restore object.

pattern

Type: string, array, function

Accepts a string/array with globbing patterns which are run through multimatch.

If you supply a function you'll get a vinyl file object as the first argument and you're expected to return true/false whether to include the file:

filter(file => /unicorns/.test(file.path));

options

Type: object

Accepts minimatch options.

Note: Set dot: true if you need to match files prefixed with a dot (eg. .gitignore).

options.restore

Type: boolean
Default: false

Restore filtered files.

options.passthrough

Type: boolean
Default: true

When set to true filtered files are restored with a PassThrough stream, otherwise, when set to false, filtered files are restored as a Readable stream.

When the stream is Readable it ends by itself, but when PassThrough, you are responsible of ending the stream.

License

MIT © Sindre Sorhus