Use History.js for better Tree browsing

Closes #1578

app/assets/javascripts/application.js

@@ -10,6 +10,7 @@
 //= require jquery.cookie
 //= require jquery.endless-scroll
 //= require jquery.highlight
+//= require jquery.history
 //= require jquery.waitforimages
 //= require jquery.atwho
 //= require bootstrap

app/assets/javascripts/tree.js.coffee

@@ -8,9 +8,6 @@ $ ->
     $('#tree-slider .tree-item-file-name a, .breadcrumb li > a').live "click", ->
       $("#tree-content-holder").hide("slide", { direction: "left" }, 150)
-    $('.project-refs-form').live
-      "ajax:beforeSend": -> $("#tree-content-holder").hide("slide", { direction: "left" }, 150)
-
     # Make the entire tree-item row clickable, but not if clicking another link (like a commit message)
     $("#tree-slider .tree-item").live 'click', (e) ->
       $('.tree-item-file-name a', this).trigger('click') if (e.target.nodeName != "A")
@@ -19,3 +16,24 @@ $ ->
     $('#tree-slider .tree-item-file-name a, .breadcrumb a, .project-refs-form').live
       "ajax:beforeSend": -> $('.tree_progress').addClass("loading")
       "ajax:complete":   -> $('.tree_progress').removeClass("loading")
+
+# Maintain forward/back history while browsing the file tree
+
+((window) ->
+  History = window.History
+  $ = window.jQuery
+  document = window.document
+
+  # Check to see if History.js is enabled for our Browser
+  unless History.enabled
+    return false
+
+  $ ->
+    $('#tree-slider .tree-item-file-name a, .breadcrumb li > a').live 'click', (e) ->
+      History.pushState(null, null, $(@).attr('href'))
+      return false
+
+    History.Adapter.bind window, 'statechange', ->
+      state = History.getState()
+      window.ajaxGet(state.url)
+)(window)

app/views/tree/_tree.html.haml

 %ul.breadcrumb
   %li
     %span.arrow
-    = link_to project_tree_path(@project, @ref), remote: true do
+    = link_to project_tree_path(@project, @ref) do
       = @project.name
   - tree.breadcrumbs(6) do |link|
     \/
@@ -26,7 +26,7 @@
         %tr.tree-item
           %td.tree-item-file-name
             = image_tag "file_empty.png", size: '16x16'
-            = link_to "..", tree.up_dir_path, remote: true
+            = link_to "..", tree.up_dir_path
           %td
           %td
@@ -44,22 +44,9 @@
           - else
             = raw GitHub::Markup.render(content.name, content.data)
-:javascript
-  $(function(){
-    history.pushState({ path: this.path }, '', "#{@history_path}");
-  });
-
 - unless tree.is_blob?
   :javascript
     // Load last commit log for each file in tree
     $(window).load(function(){
       ajaxGet('#{@logs_path}');
     });
-
-- if @path.present? && request.xhr?
-  :javascript
-    $(window).unbind('popstate');
-    $(window).bind('popstate', function() {
-      if(location.pathname.search("tree") != -1) {
-        $.ajax({type: "GET", url: location.pathname, dataType: "script"})}
-        else { location.href = location.pathname;}});

app/views/tree/_tree_item.html.haml

 %tr{ class: "tree-item #{tree_hex_class(tree_item)}" }
   %td.tree-item-file-name
     = tree_icon(type)
-    %strong= link_to truncate(tree_item.name, length: 40), project_tree_path(@project, tree_join(@id || @commit.id, tree_item.name)), remote: true
+    %strong= link_to truncate(tree_item.name, length: 40), project_tree_path(@project, tree_join(@id || @commit.id, tree_item.name))
   %td.tree_time_ago.cgray
     %span.log_loading.hide
       Loading commit data...