SONAR-4031 Compare service should suggest "LATEST" if required

=> This is useful for Views or Developers, as they don't have a version
   on their latest snapshot

plugins/sonar-core-plugin/src/main/resources/org/sonar/l10n/core.properties

@@ -539,6 +539,7 @@ comparison.move_left=Move left
 comparison.move_right=Move right
 comparison.move_down=Move down
 comparison.move_up=Move up
+comparison.version.latest=LATEST
 
 
 #------------------------------------------------------------------------------

sonar-server/src/main/webapp/WEB-INF/app/controllers/comparison_controller.rb

@@ -29,6 +29,12 @@ class ComparisonController < ApplicationController
       # the request comes from a project: let's select its 5 latest versions
       project = Project.by_key(resource_key)
       snapshots = project.events.select { |event| !event.snapshot_id.nil? && event.category==EventCategory::KEY_VERSION }[0..5].reverse.map {|e| e.snapshot}
+      # if last snapshot is not in the list, add it at the end (=> might be the case for views or developers which do not have events)
+      last_snapshot = project.last_snapshot
+      unless snapshots.last == last_snapshot
+        snapshots.shift
+        snapshots.push(last_snapshot)
+      end
     else
       # the request comes from the comparison page: let's compare the given snapshots
       sids = get_params_as_array(:sids)
@@ -66,8 +72,16 @@ class ComparisonController < ApplicationController
     
     unless key.blank?
       resource = Project.by_key(params[:resource])
+        
       # we look for the events that are versions and that are not linked to snapshots already displayed on the page
       @versions = resource.events.select { |event| !event.snapshot_id.nil? && event.category==EventCategory::KEY_VERSION && !sids.include?(event.snapshot_id.to_s) }
+      
+      # check if the latest snapshot if suggested or not (and if not, suggest it as "LATEST" => this is used for views or developers which do not have events)
+      latest_snapshot_id = resource.last_snapshot.id
+      current_and_suggested_sids = sids + @versions.map {|e| e.snapshot_id.to_s}
+      unless current_and_suggested_sids.include?(latest_snapshot_id.to_s)
+        @versions.unshift Event.new(:name => Api::Utils.message('comparison.version.latest'), :snapshot_id => latest_snapshot_id)
+      end
     end
     
     render :partial => 'versions'

sonar-server/src/main/webapp/WEB-INF/app/views/comparison/index.html.erb

@@ -192,11 +192,12 @@
             <%
                last_index = @snapshots.size-1
                @snapshots.each_with_index do |s, index|
+                 event = s.event(EventCategory::KEY_VERSION)
             %>
               <th style="text-align: center; vertical-align: top;">
                 <a href="<%= ApplicationController.root_context -%>/dashboard/index/<%= s.resource.key -%>"><%= s.resource.name(true) -%></a>
                 <br/>
-                <span class="note"><b><%= s.event(EventCategory::KEY_VERSION).name -%></b></span>
+                <span class="note"><b><%= event ? event.name : message('comparison.version.latest') -%></b></span>
                 <br/>
                 <span class="note"><%= human_short_date s.created_at -%></span>
               </th>