[gitg] Add xhr helper

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 10484fd8111b8dc6c0eee02d3bd38ee11b96c52c
Author: Jesse van den Kieboom <jessevdk gmail com>
Date:   Tue Dec 31 15:14:58 2013 +0100

    Add xhr helper

 libgitg/resources/diff-view.js |   45 +++++++++++++++++++++++++--------------
 1 files changed, 29 insertions(+), 16 deletions(-)
---
diff --git a/libgitg/resources/diff-view.js b/libgitg/resources/diff-view.js
index c1e8dea..7b5b2e1 100644
--- a/libgitg/resources/diff-view.js
+++ b/libgitg/resources/diff-view.js
@@ -1,4 +1,4 @@
-var id = 1;
+var current_diff;
 
 // Extract query parameters
 var params = function(query) {
@@ -161,10 +161,32 @@ function stage_unstage_hunk()
 function stage_unstage_line()
 {
        $(this).toggleClass("selected");
+
+function xhr_get(action, data, onload)
+{
+       var r = new XMLHttpRequest();
+
+       if (onload)
+       {
+               r.onload = function(e) { onload(r.responseText); }
+       }
+
+       t = (new Date()).getTime();
+       d = '?_t=' + t + '&viewid=' + params.viewid + "&diffid=" + current_diff;
+
+       for (var k in data)
+       {
+               d += '&' + encodeURIComponent(k) + '=' + encodeURIComponent(data[k]);
+       }
+
+       r.open("GET", "gitg-diff:/" + action + "/" + d);
+       r.send();
 }
 
 function update_diff(id, lsettings)
 {
+       current_diff = id;
+
        if (html_builder_worker)
        {
                html_builder_worker.terminate();
@@ -249,27 +271,18 @@ function update_diff(id, lsettings)
                file_template: file_template,
        });
 
-       // Load the commit directly here
-       var r = new XMLHttpRequest();
-
-       r.onload = function(e) {
-               var j = JSON.parse(r.responseText);
+       xhr_get("diff", {format: "commit_only"}, function(r) {
+               var j = JSON.parse(r);
 
                if ('commit' in j)
                {
                        $('#diff_header').html(write_commit(j.commit));
-                       $(".format_patch_button").click(function()
-                       {
-                               var patch_request = new XMLHttpRequest();
-                               patch_request.open("GET", "gitg-diff:/patch/?id=" + j.commit.id + "&viewid=" 
+ params.viewid);
-                               patch_request.send();
+
+                       $(".format_patch_button").click(function() {
+                               xhr_get('patch', {id: j.commit.id});
                        });
                }
-       }
-
-       t = (new Date()).getTime();
-       r.open("GET", "gitg-diff:/diff/?t=" + t + "&viewid=" + params.viewid + "&diffid=" + id + 
"&format=commit_only");
-       r.send();
+       });
 }
 
 addEventListener('DOMContentLoaded', function () {