Tumblr using Gist

tumblrGist.js

var gistPrefix = 'https://gist.github.com/',
    cachedWrite = document.write,
    body = $('body'),
    gists = $('a').map(function(n, a) {
        a = $(a);
        var href = a.attr('href');
        if (href.indexOf(gistPrefix) == 0) {
            return {
                a: a,
                id: href.substring(gistPrefix.length)
            };
        }
        else {
            return undefined;
        }
    }).get(),
    embedNextGist = function() {
        if (gists.length == 0) {
            document.write = cachedWrite;
        }
        else {
            var gist = gists.shift();
            document.write = function(styleLink) {
                $('head').append(styleLink);

                document.write = function(gistDiv) {
                    gist.a.replaceWith(gistDiv);
                    embedNextGist();
                };
            };
            body.append('<scr' + 'ipt src="' + gistPrefix + gist.id +
                '.js"></scr' + 'ipt>');
        }
    };
embedNextGist();

// fork from 
// https://raw.github.com/gist/2090021/tumblrGists.js

// Edit a.gist tag to a tag only
// handy for markdown :)