gist fill in fileName automatically.user.js

// ==UserScript==
// @name           gist fill in fileName automatically
// @namespace      http://efcl.info/
// @include        http://gist.github.com/
// ==/UserScript==
(function(){
    var fileExtension = ".user.js";
    var i=1;
    var editArea = document.getElementsByName("file_contents[gistfile"+i+"]")[0];
    var editFileName = document.getElementsByName("file_name[gistfile"+i+"]")[0];
    editArea.addEventListener("paste", function(e){
        var self = e;
        setTimeout(function(){
            var pasteValue = self.target.value;
            var m = pasteValue.match(/@name\s+([\w\s]+)\n/i);
                m = m && m[1];
            if(m && !editFileName.value){
               m = m.replace(/\s+$/ , "");
               // m = m.replace(" " , "_" , "g");// 第３引数 繰り返し
               editFileName.value = m + fileExtension;
//                console.log(m + fileExtension);
               editFileName.focus();
            }
        }, 0);
    }, false);
})();