Revert "remove Glyphicons docs autogeneration from Grunt"

This reverts commit 36b53089.
This reverts PR #14065.

Turns out Glyphicons is more active than we'd thought.

Gruntfile.js

@@ -18,6 +18,7 @@ module.exports = function (grunt) {
   var fs = require('fs');
   var path = require('path');
   var npmShrinkwrap = require('npm-shrinkwrap');
+  var generateGlyphiconsData = require('./grunt/bs-glyphicons-data-generator.js');
   var BsLessdocParser = require('./grunt/bs-lessdoc-parser.js');
   var getLessVarsData = function () {
     var filePath = path.join(__dirname, 'less/variables.less');
@@ -464,6 +465,8 @@ module.exports = function (grunt) {
   // This can be overzealous, so its changes should always be manually reviewed!
   grunt.registerTask('change-version-number', 'sed');
 
+  grunt.registerTask('build-glyphicons-data', function () { generateGlyphiconsData.call(this, grunt); });
+
   // task for building customizer
   grunt.registerTask('build-customizer', ['build-customizer-html', 'build-raw-files']);
   grunt.registerTask('build-customizer-html', 'jade');
@@ -483,7 +486,7 @@ module.exports = function (grunt) {
   grunt.registerTask('lint-docs-css', ['csslint:docs', 'csslint:examples']);
   grunt.registerTask('docs-js', ['uglify:docsJs', 'uglify:customize']);
   grunt.registerTask('lint-docs-js', ['jshint:assets', 'jscs:assets']);
-  grunt.registerTask('docs', ['docs-css', 'lint-docs-css', 'docs-js', 'lint-docs-js', 'clean:docs', 'copy:docs', 'build-customizer']);
+  grunt.registerTask('docs', ['docs-css', 'lint-docs-css', 'docs-js', 'lint-docs-js', 'clean:docs', 'copy:docs', 'build-glyphicons-data', 'build-customizer']);
 
   grunt.registerTask('prep-release', ['jekyll:github', 'compress']);
 

grunt/bs-glyphicons-data-generator.js

+/*!
+ * Bootstrap Grunt task for Glyphicons data generation
+ * http://getbootstrap.com
+ * Copyright 2014 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-[^\s]+)/;
+  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.');
+};