bookmarkable compare urls

lib/gollum/frontend/app.rb

@@ -87,12 +87,24 @@ module Precious
     end
 
     post '/compare/:name' do
-      @name = params[:name]
-      @versions = params[:versions]
-      wiki = Gollum::Wiki.new($path)
-      @page = wiki.page(@name)
-      diffs = wiki.repo.diff(@versions[1], @versions[0], @page.path)
-      @diff = diffs.first
+      @versions = params[:versions] || []
+      if @versions.size < 2
+        redirect "/history/#{params[:name]}"
+      else
+        redirect "/compare/%s/%s...%s" % [
+          params[:name],
+          @versions.last,
+          @versions.first]
+      end
+    end
+
+    get '/compare/:name/:version_list' do
+      @name     = params[:name]
+      @versions = params[:version_list].split(/\.{2,3}/)
+      wiki      = Gollum::Wiki.new($path)
+      @page     = wiki.page(@name)
+      diffs     = wiki.repo.diff(@versions.first, @versions.last, @page.path)
+      @diff     = diffs.first
       mustache :compare
     end
 

lib/gollum/frontend/public/javascript/gollum.js

@@ -205,7 +205,8 @@ $(function(){
 
   $('ul.inline-tabs').tabs()
 
-  var selectedRevisions = []
+  var selectedRevisions = [];
+  var baseCompareUrl    = null
 
   $('form#history input[type=checkbox]').change(function() {
     var id = $(this).val()
@@ -225,7 +226,10 @@ $(function(){
     $('form#history input[type=submit]').attr('disabled', true)
 
     if (selectedRevisions.length == 2) {
-      $('form#history input[type=submit]').attr('disabled', false)
+      if(!baseCompareUrl) baseCompareUrl = $('form#history').attr('action')
+      var compareUrl = baseCompareUrl + "/" + selectedRevisions[1] + '...' + selectedRevisions[0]
+      //$('form#history').attr('action', compareUrl)
+      $('form#history input[type=submit]').attr('disabled', false).attr('method', 'get')
       var on = false
       $('form#history tr.commit').each(function() {
         if (on) { $(this).addClass("selected") }

lib/gollum/frontend/views/compare.rb

@@ -12,11 +12,11 @@ module Precious
       end
 
       def before
-        @versions[1][0..6]
+        @versions[0][0..6]
       end
 
       def after
-        @versions[0][0..6]
+        @versions[1][0..6]
       end
 
       def lines