Use to create an immutable, lazily initialized pipeline from a series of streams. 

overzealous

lazypipe

  "description": "Use to create an immutable, lazily initialized pipeline from a series of streams.",

  "homepage": "https://github.com/OverZealous/lazypipe",

    "url": "git://github.com/OverZealous/lazypipe.git"

    "url": "https://github.com/OverZealous/lazypipe/issues"

      "url": "http://github.com/OverZealous/lazypipe/raw/master/LICENSE"

[![NPM version][npm-image]][npm-url] [![Build Status][travis-image]][travis-url]

[![NPM version][npm-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Support via Gratipay][gratipay-image]][gratipay-url]

Lazypipe allows you to create an immutable, lazily-initialized pipeline.  It's designed to be used in an environment where you want to reuse partial pipelines, such as with [gulp](http://gulpjs.com).

This module returns a function that can be used to start building a lazypipe.  Individual steps are added via the `.pipe()` method.  At any point, a new lazypipe can be built by adding to an existing one, without affecting the previous lazypipe.  Lazypipes can even be used as steps within another lazypipe.

Once the partial pipeline is ready to use, call the last result from `.pipe()` directly as a function (e.g.: `.pipe()()`).

    // adding a pipeline step, notice the stream function has not been called!

    .pipe(jshint.reporter, 'jshint-stylish');

// this is OK, because lazypipes are immutable

// jsHintTasks will _not_ be affected by the addition.

    gulp.src('js/**/*.js').pipe(jsHintTasks());

    return gulp.src('js/**/*.js').pipe(jsTasks());

gulp.task('default', ['build'], function() {

You can combine lazypipes in various ways:

var foo = lazypipe().pipe(streamA).pipe(streamB);

// streamD -> streamA -> streamB -> streamE

var baz = lazypipe().pipe(streamD).pipe(foo).pipe(streamE);

### Using with more complex function arguments (such as [gulp-if](https://github.com/robrich/gulp-if))

Lazypipe assumes that all function parameters are static, gulp-if arguments need to be instantiated inside each lazypipe.  This difference can be easily solved by passing a function on the lazypipe step

  .pipe(jshint) // notice the stream function has not been called!

  // adding a step with multiple arguments

  .pipe(concat, 'bundle.js', {newLine: ';'})

  // you can't say: .pipe(gulpif, compressing, uglify)

  // because uglify needs to be instantiated separately in each lazypipe instance

    return gulpif(compressing, uglify());

  // why does this work? lazypipe calls the function, passing in the no arguments to it,

  // it instantiates a new gulp-if pipe and returns it to lazypipe.

If you'd like to support this and other OverZealous Creations (Phil DeJarnett) projects, [donate via Gittip][gittip-url]!

If you'd like to support this and other OverZealous Creations (Phil DeJarnett) projects, [donate via Gratipay][gratipay-url]!

[![Support via Gittip][gittip-image]][gittip-url]

[![Support via Gratipay][gratipay-image]][gratipay-url]

[MIT License](http://en.wikipedia.org/wiki/MIT_License)

[npm-url]: https://npmjs.org/package/lazypipe

[npm-image]: https://badge.fury.io/js/lazypipe.png

[travis-url]: http://travis-ci.org/OverZealous/lazypipe

[travis-image]: https://secure.travis-ci.org/OverZealous/lazypipe.png?branch=master

[gittip-url]: https://www.gittip.com/OverZealous/

[gittip-image]: https://raw2.github.com/OverZealous/gittip-badge/0.1.2/dist/gittip.png

[gratipay-url]: https://www.gratipay.com/OverZealous/

[gratipay-image]: https://img.shields.io/gratipay/OverZealous.svg

package.json file has a `licenses` property, but it contains an invalid SPDX expression

		{
		"name": "lazypipe",
		"description": "Use to create an immutable, lazily initialized pipeline from a series of streams.",
		"version": "0.2.3",
		"version": "0.2.4",
		"homepage": "https://github.com/OverZealous/lazypipe",
		@@ -44,8 +44,3 @@ "repository": {
		},
		"licenses": [
		{
		"type": "MIT",
		"url": "http://github.com/OverZealous/lazypipe/raw/master/LICENSE"
		}
		]
		"licenses": "MIT"
		}

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		# lazypipe

		[![NPM version][npm-image]][npm-url] [![Build Status][travis-image]][travis-url]
		[![NPM version][npm-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Support via Gratipay][gratipay-image]][gratipay-url]

		@@ -143,5 +143,5 @@ Lazypipe allows you to create an immutable, lazily-initialized pipeline. It's designed to be used in an environment where you want to reuse partial pipelines, such as with [gulp](http://gulpjs.com).

		If you'd like to support this and other OverZealous Creations (Phil DeJarnett) projects, [donate via Gittip][gittip-url]!
		If you'd like to support this and other OverZealous Creations (Phil DeJarnett) projects, [donate via Gratipay][gratipay-url]!

		[![Support via Gittip][gittip-image]][gittip-url]
		[![Support via Gratipay][gratipay-image]][gratipay-url]

		@@ -160,3 +160,3 @@

		[gittip-url]: https://www.gittip.com/OverZealous/
		[gittip-image]: https://raw2.github.com/OverZealous/gittip-badge/0.1.2/dist/gittip.png
		[gratipay-url]: https://www.gratipay.com/OverZealous/
		[gratipay-image]: https://img.shields.io/gratipay/OverZealous.svg