gulp-potomo/index.js

Gulp plugin to compile .po files into binary .mo files with msgfmt

/*
 * gulp-potomo
 * https://github.com/felixzapata/gulp-potomo
 *
 * Copyright (c) 2016 Félix Zapata
 * Licensed under the ISC license.
 */

'use strict';

var fs = require('fs-extra');
var path = require('path');
var R = require('ramda');
var chalk = require('chalk');
var through = require('through2');
var shell = require('shelljs');
var gutil = require('gulp-util');
var PLUGIN_NAME = 'gulp-potomo';


function fileExists(filePath) {
  try {
    return fs.statSync(filePath).isFile();
  } catch (e) {
    return false;
  }
}

function gulpPotomo(customOptions, cb) {

  var defaultOptions = {
    poDel: false,
    verbose: true
  };

  var options = customOptions ? R.merge(defaultOptions, customOptions) : defaultOptions;

  function log(message) {
    if(options.verbose) {
      console.log(message);
    }
  }

  function bufferContents(file, enc, cb) {

    /* jshint validthis: true */

    var mofileDest;
    var moFile;
    var moFileName;
    var command;
    var message;
    var tempFolder;

    // Return warning if not found msgfmt command
    if (!shell.which('msgfmt')) {
      this.emit('error', new gutil.PluginError(PLUGIN_NAME, 'GNU gettext is not installed in your system PATH.'));
      cb();
      return;
    }

    // ignore empty files
    if (file.isNull()) {
      cb();
      return;
    }

    if (file.isStream()) {
      this.emit('error', new gutil.PluginError(PLUGIN_NAME, 'Streaming not supported'));
      cb();
      return;
    }


    // create a temp folder to save the mo files
    tempFolder = path.join(__dirname, 'tmp/');
    fs.mkdirsSync(tempFolder);

    moFileName = path.basename(file.path, '.po') + '.mo';
    mofileDest = path.join(tempFolder, moFileName);

    command = 'msgfmt -o "' + mofileDest + '" "' + file.path + '"';

    if (shell.exec(command).code !== 0) {
      this.emit('error', new gutil.PluginError(PLUGIN_NAME, 'Failed to Compile "*.po" files into binary "*.mo" files with "msgfmt".'));
      cb();
      return;
    } else {
      log('File ' + chalk.cyan(mofileDest) + ' Created.');
      moFile = new gutil.File({
        path: moFileName,
        contents: new Buffer(fs.readFileSync(mofileDest))
      });
    }

    // remove the temp folder
    fs.removeSync(tempFolder);

    // Delete Source PO file(s).
    if (options.poDel && fileExists(file.path)) {
      fs.removeSync(file.path);
    }

    // Process the Message.

    message = 'Compiled ' + file.path + ' file.';
    if (options.poDel) {
      message = 'Deleted ' + file.path + ' files.';
    }
    log(chalk.green(message));

    this.push(moFile);

    cb();

  }

  return through.obj(bufferContents, cb);

}

// Exporting the plugin main function
module.exports = gulpPotomo;