addeditlinkontumblr.user.js

// ==UserScript==
// @name           add edit link on tumblr
// @namespace      http://d.hatena.ne.jp/taizooo/
// @include        http://*.tumblr.com/*
// @exclude        http://www.tumblr.com/*
// ==/UserScript==

(function(){
  function f(doc){
    $X('.//a[@class="permalink"]', doc).forEach(function(a){
    var match = a.href.match(/\/post\/(\d+)/);
    var id = match[1];
    var ae = document.createElement('a');
    var textNode = document.createTextNode('Edit');
    ae.appendChild(textNode);
    ae.href = '/edit/' + id + '?redirect_to='  + encodeURIComponent(a.href);
	ae.className = 'edi_perm';
	ae.style.margin = '5px';
	ae.style.fontSize = '10px';
    a.parentNode.insertBefore(ae, a.nextSibling);
  });
}
f(document);
function addFilter() {
  window.AutoPagerize.addFilter(function(docs){
    for (var i = 0,l = docs.length;i < l;i++) f(docs[i]);
  });
}
if (window.AutoPagerize && window.AutoPagerize.addFilter)
  addFilter();
else
  window.addEventListener('GM_AutoPagerizeLoaded', addFilter, false);
})()

// simple version of $X
// $X(exp);
// $X(exp, context);
// @source http://gist.github.com/3242.txt
function $X (exp, context) {
	context || (context = document);
	var expr = (context.ownerDocument || context).createExpression(exp, function (prefix) {
		return document.createNSResolver(context.documentElement || context).lookupNamespaceURI(prefix) ||
			context.namespaceURI || document.documentElement.namespaceURI || "";
	});

	var result = expr.evaluate(context, XPathResult.ANY_TYPE, null);
		switch (result.resultType) {
			case XPathResult.STRING_TYPE : return result.stringValue;
			case XPathResult.NUMBER_TYPE : return result.numberValue;
			case XPathResult.BOOLEAN_TYPE: return result.booleanValue;
			case XPathResult.UNORDERED_NODE_ITERATOR_TYPE:
				// not ensure the order.
				var ret = [], i = null;
				while (i = result.iterateNext()) ret.push(i);
				return ret;
		}
	return null;
}