/*!
 * Bootstrap Grunt task for Glyphicons data generation
 * http://getbootstrap.com
 * Copyright 2014-2015 Twitter, Inc.
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 */

'use strict';

var fs = require('fs');

module.exports = function generateGlyphiconsData(grunt) {
    // Pass encoding, utf8, so `readFileSync` will return a string instead of a
    // buffer
    var glyphiconsFile  = fs.readFileSync('less/glyphicons.less', 'utf8');
    var glyphiconsLines = glyphiconsFile.split('\n');

    // Use any line that starts with ".glyphicon-" and capture the class name
    var iconClassName  = /^\.(glyphicon-[a-zA-Z0-9-]+)/;
    var glyphiconsData = '# This file is generated via Grunt task. **Do not edit directly.**\n' +
        '# See the \'build-glyphicons-data\' task in Gruntfile.js.\n\n';
    var glyphiconsYml  = 'docs/_data/glyphicons.yml';
    for (var i = 0, len = glyphiconsLines.length; i < len; i++) {
        var match = glyphiconsLines[i].match(iconClassName);

        if (match !== null) {
            glyphiconsData += '- ' + match[1] + '\n';
        }
    }

    // Create the `_data` directory if it doesn't already exist
    if (!fs.existsSync('docs/_data')) {
        fs.mkdirSync('docs/_data');
    }

    try {
        fs.writeFileSync(glyphiconsYml, glyphiconsData);
    } catch (err) {
        grunt.fail.warn(err);
    }
    grunt.log.writeln('File ' + glyphiconsYml.cyan + ' created.');
};