Embeded gist syntax for Ghost. Place in ./core/server/api/posts.js.

posts.js

//the code below will embed replace [gist id=x] tags with an embedded gist similar to the way the Wordpress Gist 
//plugin works. I wrote this in order to import posts from Wordpress. See //GB: for the changes.

// **takes:** filter / pagination parameters
browse: function browse(options) {
    options = options || {};

    // **returns:** a promise for a page of posts in a json object
    //return dataProvider.Post.findPage(options);
    return dataProvider.Post.findPage(options).then(function (result) {
        var i = 0,
            omitted = result, html;

        for (i = 0; i < omitted.posts.length; i = i + 1) {
            omitted.posts[i].author = _.omit(omitted.posts[i].author, filteredUserAttributes);
            omitted.posts[i].user = _.omit(omitted.posts[i].user, filteredUserAttributes);
            html = omitted.posts[i].html;

            //GB: remove any gist id from the preview in case they are in the first para
            omitted.posts[i].html = html.replace(/\[gist id=([0-9]+)\]/, "");
        }
        return omitted;
    });
},

// #### Read

// **takes:** an identifier (id or slug?)
read: function read(args) {
    // **returns:** a promise for a single post in a json object
     return dataProvider.Post.findOne(args).then(function (result) {
        var omitted;

        if (result) {
            omitted = result.toJSON();
            omitted.author = _.omit(omitted.author, filteredUserAttributes);
            omitted.user = _.omit(omitted.user, filteredUserAttributes);

            //GB: replace the gist tag with the embedded gist
            omitted.html = omitted.html.replace(/\[gist id=([0-9]+)\]/, "<script src=\"https://gist.github.com/$1.js\"></script>");
            return omitted;
        }
        return when.reject({errorCode: 404, message: 'Post not found'});

    });
},

This works great. Just a FYI that gist id's now seem to have gone from numeric to alphanumeric ... so the regex's that I've found useful are [a-z0-9] rather than [0-9]. Thanks for sharing. This is really useful for sharing code snips in certain blog posts.