assemble-handle

assemble-handle

Assemble pipeline plugin for handling custom middleware stages.

Install

Install with npm:

$ npm install --save assemble-handle

Usage

var 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

var assemble = require('assemble');
var handle = require('assemble-handle');
var 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.

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

app.handler('onFoo');

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

app.task('handle-once', function(cb) {
  var 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) {
  var 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

Related projects

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• assemble-fs: Assemble plugin to add methods to assemble for working with the file system, like src… 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

Contributing

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

Contributors

Commits	Contributor
13	jonschlinkert
3	doowb

Building docs

(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

Running tests

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

Author

Jon Schlinkert

• github/jonschlinkert
• twitter/jonschlinkert

License

Copyright © 2017, Jon Schlinkert. Released under the MIT License.

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This file was generated by verb-generate-readme, v0.6.0, on May 28, 2017.