index.js

/**
 * Generates the userscript metadata block.
 * @param  {object} userscript The object containing the userscript data.
 * @param  {object} context    The data used to parse values with mustache. Use {{{yourKey}}} in the data to parse.
 * @return {string}            The finalized metadata block.
 */

var hogan = require('hogan.js');

function generateUserscriptHeader(userscript, context) {
	var header = [];
	var key = null;
	var data = null;

	header.push('// ==UserScript==');
	for (key in userscript) {
		if (!userscript.hasOwnProperty(key)) {
			continue;
		}

		data = userscript[key];
		if (Array.isArray(data)) {
			data.forEach(function (value) {
				pushLine(key, value);
			});
		}
		else {
			pushLine(key, data);
		}   
	}
	header.push('// ==/UserScript==');

	function pushLine(key, value) {
		header.push('// @' + key + ' ' + hogan.compile(value).render(context));
	}

	return header.join('\n') + '\n\n';
};

module.exports = generateUserscriptHeader;