grunt-sails-linker/tasks/scriptlinker.js

Autoinsert script and link tags in an html file.

/*
 * grunt-scriptlinker
 * https://github.com/scott-laursen/grunt-scriptlinker
 *
 * Copyright (c) 2013 scott-laursen
 * Copyright (c) 2013 Zoli Kahan
 * Copyright (c) 2014 Mike McNeil
 * Licensed under the MIT license.
 */

'use strict';

var util = require('util');

module.exports = function(grunt) {

	// Please see the Grunt documentation for more information regarding task
	// creation: http://gruntjs.com/creating-tasks

	grunt.registerMultiTask('sails-linker', 'Autoinsert script tags in an html file.', function() {
		// Merge task-specific and/or target-specific options with these defaults.
		var options = this.options({
			startTag: '<!--SCRIPTS-->',
			endTag: '<!--SCRIPTS END-->',
			fileTmpl: '<script src="%s"></script>',
			appRoot: '',
			relative: false,
			inline: false
		});


		// Iterate over all specified file groups.
		this.files.forEach(function (f) {
			var scripts,
				page = '',
				newPage = '',
				start = -1,
				end = -1;

			// Create string tags
			scripts = f.src.filter(function (filepath) {
					// Warn on and remove invalid source files (if nonull was set).
					if (!grunt.file.exists(filepath)) {
						grunt.log.warn('Source file "' + filepath + '" not found.');
						return false;
					} else { return true; }
				}).map(function (filepath) {
					if (options.inline) {
						var contents = grunt.file.read(filepath);
						return util.format(options.fileTmpl, contents);
					}
					filepath = filepath.replace(options.appRoot, '');
					// If "relative" option is set, remove initial forward slash from file path
					if (options.relative) {
						filepath = filepath.replace(/^\//,'');
					}
					filepath = (options.prefix||'') + filepath;
					if (options.fileRef) {
						return options.fileRef(filepath);
					} else {
						return util.format(options.fileTmpl, filepath);
					}
				});

			grunt.file.expand({}, f.dest).forEach(function(dest){
				page = grunt.file.read(dest);
				start = page.indexOf(options.startTag);
				end = page.indexOf(options.endTag, start);

				if (start === -1 || end === -1 || start >= end) {
					return;
				} else {
					var padding ='';
					var ind = start - 1;
					while(/[^\S\n]/.test(page.charAt(ind))){
						padding += page.charAt(ind);
						ind -= 1;
					}
					newPage = page.substr(0, start + options.startTag.length) + grunt.util.linefeed + padding + scripts.join(grunt.util.linefeed + padding) + grunt.util.linefeed + padding + page.substr(end);
					// Insert the scripts
					grunt.file.write(dest, newPage);
					grunt.log.writeln('File "' + dest + '" updated.');
				}
			});
		});
	});

};