Package Exports

through-gulp

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through-gulp

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A tiny wrapper around Node streams. To make gulp plugin write easier. Inspired by through2, (https://github.com/rvagg/through2/), but much simplify for gulp-plugin only.

Install

npm install through-gulp --save

API

One main API provided to use.

var through = require('through-gulp');
var stream = through(transformFunction, flushFunction);

Both argument has default value to pipe data next without processing. if just for files map or files filter, two shortcut method provided as well.

// './test/fixtures/template.js'
define({});
// './test/fixtures/destiny.js'
define(function(){});

gulp.src(['./test/fixtures/template.js','./test/fixtures/destiny.js'])
    .pipe(through.map(function(file) {
        file.contents = Buffer.concat([new Buffer('love '), file.contents]);
        return file;
    }))
    .pipe(assert.first(function(file) {
        (file.contents.toString()).should.equal('love define({});');
    }))
    .on('end', done);

gulp.src(['./test/fixtures/template.js','./test/fixtures/destiny.js'])
    .pipe(through.filter(function(file) {
        return file.contents.toString().indexOf('function') !== -1;
    }))
    .pipe(assert.first(function(file) {
        (file.contents.toString()).should.equal('define(function(){});');
    }))
    .on('end', done);

Usage

A simple demonstrate to write a gulp-plugin with through-gulp. If you know nothing about gulp plugin, check this (https://github.com/gulpjs/gulp/blob/master/docs/writing-a-plugin/guidelines.md)

// PLUGIN_NAME: sample
var through = require('through-gulp');

function sample() {
  // creating a stream through which each file will pass
  var stream = through(function(file, encoding,callback) {
        // do whatever necessary to process the file 
      if (file.isNull()) {

      }
      if (file.isBuffer()) {

      }
      if (file.isStream()) {

      }
      // just pipe data next, or just do nothing to process file later in flushFunction
      // never forget callback to indicate that the file has been processed.
      this.push(file);
      callback();
    },function(callback) {
      // just pipe data next, just callback to indicate that the stream's over
      this.push(something);
      callback();
    });

  // returning the file stream
  return stream;
};

// exporting the plugin 
module.exports = sample;

then use the plugin with gulp

var gulp = require('gulp');
var sample = require('sample');
gulp.task('sample', function() {
    return gulp.src(['source file'])
        .pipe(sample())
        .pipe(gulp.dest('file destiny'))
});

Contact

Email: hjj491229492@hotmail.com.