opera user js for searching gist

gist-search.user.js

// ==UserScript==
// @include http://gist.github.com/*
// ==/UserScript==

(function(){
	var $ = function(id){
		return document.getElementById(id);
	};
	var classLoop = function(tag_name, class_name, func){
		var tags = document.getElementsByTagName(tag_name);
		if(tags){
			for(var i = 0; i < tags.length; ++i){
				if(tags[i].className == class_name) func(tags[i]);
			}
		}
	};

	var settings = {
		label_text: "&nbsp; find: ",
		label_color: "#888",
		form_id: "search_form"
	};

	var check_key_up = function(e){
		var obj = $(settings.form_id);
		if(obj){
			var value = obj.value;
			if(value.length < 2){
				classLoop("div", "file", function(elem){
					elem.style.display = "block";
				});
			} else {
				classLoop("div", "file", function(elem){
					if(elem.innerHTML.match(obj.value)){
						elem.style.display = "block";
					} else {
						elem.style.display = "none";
					}
				});
			}
		}
	};

	var select_form = function(e){
		var obj = $(settings.form_id);
		if(obj) obj.select();
	};

	window.onload = function(){
		var label = document.createElement("span");
		var search_form = document.createElement("input");
		search_form.type = "text";
		search_form.id = settings.form_id;

		label.innerHTML = settings.label_text;
		label.style.color = settings.label_color;

		var h2 = document.getElementsByTagName("h2")[0];
		h2.appendChild(label);
		h2.appendChild(search_form);

		search_form.addEventListener("keyup", check_key_up, true);
		search_form.addEventListener("click", select_form, false);
		search_form.focus();
	};
})();