Gulp Tarjeem

Here in short this Gulp plugin is,

Function-style, dictionary agnostic translation gulp plugin which compile javascript source codes into localized scripts.

"Do one thing and do it well"

This project restricted to, or only feature

• Function-styled
• Compile javascript source code to localized scripts
• Dictionary agnostic (as long as it converted to JSON)
• One dictionary into one output for each file passed through

If above points deviated, please report a bug.

Usage

In gulpfile.js

First, install gulp-tarjeem as a development dependency:

# Not published yet :(
npm install --save-dev gulp-tarjeem

Then, add it to your gulpfile.js:

var translate = require('gulp-tarjeem');

gulp.task('translate', function() {
  var translations = ['en', 'id'];

  translations.forEach(function(translation){
    gulp.src('app/script/**/*.js')
      .pipe(translate(options))
      .pipe(gulp.dest('dist/script/' + translation));
  });
});

or better, handle errors:

gulp.task('translate', function() {
  var translations = ['en', 'id'];

  translations.forEach(function(translation){
    gulp.src('app/script/**/*.js')
      .pipe(
        translate(options)
        .on('error', function(){
          console.error(arguments);
        })
      )
      .pipe(gulp.dest('dist/script/' + translation));
  });
});

In your locales

You may put locale in a directory with language abbrev as it's name.

locales/en.json

{ "title": "My new Gulp plugin, call it Tarjeem" }

locales/id.json

{ "title": "Plugin Gulp baru milik saya, sebut saja Tarjeem" }

In your script.js

Then you can "calling" transl plugin with an argument of a key in your locales you specified earlier.

Something like this will do,

document.getElementById('title').text(transl("title"))

will be compiled into

// File: en/script.js
document.getElementById('title').text("My new Gulp plugin, call it Tarjeem")

// File: id/script.js
document.getElementById('title').text("Plugin Gulp baru milik saya, sebut saja Tarjeem")

If you're still not sure, please look at tests.

API

translate(dictionaryFilePath)

gulp-tarjeem is called with a string

dictionaryFilePath

Type: String

The string is a path to a locale-file-name.js with your locales. Please look at test/locales for examples.

translate(options)

gulp-tarjeem is called with an object

options

Type: Object

An Object with the following properties that affect how this plugin works,

• .dictionaryFilePath String. Path to locale file.
• .dictionaryObject Object. Dictionary to lookup instead of locale specified above. If you specify this, dictionaryFilePath property will be ignored.
• .syntaxFnName String. Function name to match.
  Default: transl
• .fileToDictFn Function, signature function(filecontent) => Object. Custom function to convert whatever dictionaryFilePath content might be into Javascript key-value object.
• .translatorFn Function, signature function(key, dictionary) => string. Custom function to convert translation key into translated output string.
  Default: Convert dot-separated namespace "some.name.space" into dictionaryObject['some']['name']['space'].

Tips & Trick

This plugin is actually very flexible. A String in Javascript can be chained with built in method such as toUpperCase(), toLowerCase(). So, you can do lots of things.

// Chain with .toUpperCase()
var message1 = transl("title").toUpperCase();

// Process with function
var message2 = String.toUpperCase(transl("title"));

// Chain to replace a placeholder
var message3 = transl("title").replace(':year', new Date.getFullYear());

TODO:

• refactor tests
• work on matchers (sigh...)

License

This work adapted from @arathunku's MIT-licensed (https://github.com/arathunku/gulp-translator).

Further work contribution licensed into Mozilla Public License 2.0 (MPL-2.0).