assemble-handle

Assemble pipeline plugin for handling custom middleware stages.

Please consider following this project's author, Jon Schlinkert, and consider starring the project to show your :heart: and support.

Install

Install with npm:

$ npm install --save assemble-handle

Usage

const handle = require('assemble-handle');

handle

Handle middleware for the given middleware "stage".

app.task('default', function() {
  return app.src('*.js')
    .pipe(handle(app, 'handlerName')) //<= handle middleware
    .pipe(app.dest('foo'))
});

Example

const assemble = require('assemble');
const handle = require('assemble-handle');
const app = assemble();

/**
 * create some middleware "stages"
 */

app.handler('onStream');
app.handler('preWrite');
app.handler('postWrite');

/**
 * Create middleware
 */

app.onStream(/\.(js|css)$/, function(file, next) {
  // lint javascript
  next();
});

app.preWrite(/\.(jpg|png)$/, function(file, next) {
  // minify images
  next();
});

app.postWrite(/./, function(file, next) {
  // create files tree or something
  next();
});

/**
 * Run (handle) the middleware 
 */

app.task('site', function() {
  return app.src('assets/**/*.*')
    .pipe(handle(app, 'onStream'))  // handle onStream
    .pipe(handle(app, 'preWrite'))  // handle preWrite
    .pipe(app.dest('site/'));
    .pipe(handle(app, 'postWrite')) // handle postWrite
});

handle.once

A .once method is exposed, which has the same exact behavior as the main function, but will ensure that middleware is only handled once for a given "stage".

Example

For example the given middleware will only run once.

const assemble = require('assemble-core');
const handle = require('assemble-handle');
const app = assemble();

app.handler('onFoo');

app.onFoo(/./, function(file, next) {
  file.count = file.count || 0;
  file.count++;
  next();
});

app.task('handle-once', function(cb) {
  let files = [];
  app.src('test/**/*.*')
    .pipe(handle.once(app, 'onFoo'))
    .pipe(handle.once(app, 'onFoo'))
    .pipe(handle.once(app, 'onFoo'))
    .pipe(handle.once(app, 'onFoo'))
    .pipe(handle.once(app, 'onFoo'))
    .on('data', function(file) {
      files.push(file);
    })
    .pipe(app.dest('test/actual'))
    .on('end', function() {
      console.log(files[0].count);
      //=> 1
      cb();
    });
});

app.task('handle', function(cb) {
  let files = [];
  app.src('test/**/*.*')
    .pipe(handle(app, 'onFoo'))
    .pipe(handle(app, 'onFoo'))
    .pipe(handle(app, 'onFoo'))
    .pipe(handle(app, 'onFoo'))
    .pipe(handle(app, 'onFoo'))
    .on('data', function(file) {
      files.push(file);
    })
    .pipe(app.dest('test/actual'))
    .on('end', function() {
      console.log(files[0].count);
      //=> 5
      cb();
    });
});

Custom handlers

Create custom middleware handlers.

app.handler('onFoo');

This adds an .onFoo method to the instance:

app.onFoo(/\.hbs$/, function(file, next) {
  // do stuff to file
  next();
});

All .onFoo middleware will now run when the onFoo handler is called:

app.task('default', function() {
  return app.src('*.hbs')

    // call the `onFoo` handler
    .pipe(handle(app, 'onFoo')) 
});

About

<summary>Contributing</summary>

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

<summary>Running Tests</summary>

Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:

$ npm install && npm test

<summary>Building docs</summary>

(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)

To generate the readme, run the following command:

$ npm install -g verbose/verb#dev verb-generate-readme && verb

Related projects

You might also be interested in these projects:

assemble-core: The core assemble application with no presets or defaults. All configuration is left to the… more | homepage
assemble-fs: Light wrapper for vinyl-fs to add streams support in a way that plays nice with… more | homepage
assemble-streams: Assemble pipeline plugin for pushing views into a vinyl stream. | homepage
assemble: Get the rocks out of your socks! Assemble makes you fast at creating web projects… more | homepage

Contributors

Commits	Contributor
17	jonschlinkert
3	doowb

Author

Jon Schlinkert

License

This file was generated by verb-generate-readme, v0.8.0, on December 11, 2018.

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