gistfile1.txt

var raw_data;
var positions = [];
$(function(){
    $('#wiki-body').each(function(){
        var txt = $(this).html();
        var checkbox = '<input class="task-list" type="checkbox" '
        $(this).html(
            txt.replace(/\[x\]/g, checkbox + 'checked>').
                replace(/\[ \]/g, checkbox + '>')
        );
    });
    var task_list = $('input.task-list');
    task_list.each(function(i){
        if ($(this).parent()[0].nodeName != "LABEL"){
            $(this).parent().contents().wrapAll("<label></label>");
        }
        $(this).attr({index: i})
    });
});

           $(document).off("change", 'input.task-list[type=checkbox]');
           function change(){
               var i = $(this).attr("index");
               var state = ($(this).attr("checked") == "checked")? "[x]": "[ ]";
               console.log();
               var path = location.pathname.split("/");
               path.shift();
               $.get("/data" + location.pathname, function(data){
                   var checkbox_re=/\[ \]|\[x\]/g;
                   var result;
                   while ((result = checkbox_re.exec(data)) !== null) {
                       positions.push([result.index, checkbox_re.lastIndex]);
                   }
                   raw_data = data;
                   $.post("/edit" + location.pathname,
                          {page: path.pop(),
                           path: path.join("/"),
                           format: "markdown",
                           content: raw_data.slice(0, positions[i][0]) + state + raw_data.slice(positions[i][1]),
                           message: "Updated "
                          })
               });
           }
           $(document).on("change", 'input.task-list[type=checkbox]', change);