Added branch and tag support to the git repository viewer. (#1406)

Many thanks to Adam Soltys and everyone else who tested this patch.

* Updated git test repository so it has a branch with some differences from the master branch
* Moved redmine diff class into a module so as not to clash with diff-lcs gem which is required by grit
* Find changesets from all branches, not just master
* Got revision browsing working
* Got file actions working properly
* Allow browsing by short form of commit identifier
* Added a method to retrieve repository branches
* Allow browsing by branch names as well as commit numbers
* Handle the case where a git repository has no master branch
* Expand revision box and handle finding revisions by first 8 characters
* Added branches dropdown to repository show page
* Combined repository browse and show into a single action.  Moved branch/revision navigation into a partial.
* Renamed partial navigation -> breadcrumbs
* Made it so latest revisions list uses branch and path context
* Preserve current path when changing branch or revision
* Perform slightly more graceful error handling in the case of invalid repository URLs
* Allow branch names to contain periods
* Allow dashes in branch names
* Sort branches by name
* Adding tags dropdown
* Need to disable both branches and tags dropdowns before submitting revision form
* Support underscores in revision (branch/tag) names
* Making file history sensitive to current branch/tag/revision, adding common navigation to changes page
* Updated translation files to include labels for 'branch', 'tag', and 'view all revisions'
* Reenable fields after submit so they don't look disabled and don't stay disabled on browser back button
* Instead of dashes just use empty string for default dropdown value
* Individual entry views now sport the upgraded revision navigation
* Don't display dropdowns with no entries
* Consider all revisions when doing initial load
* Fixed bug grabbing changesets.  Thanks to Bernhard Furtmueller for catching.
* Always check the entire log to find new revisions, rather than trying to go forward from the latest known one
* Added some cleverness to avoid selecting the whole changesets table any time someone views the repository root
* File copies and renames being detected properly
* Return gracefully if no revisions are found in the git log
* Applied patch from Babar Le Lapin to improve Windows compatibility

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2840 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/repositories_controller.rb

@@ -64,31 +64,26 @@ class RepositoriesController < ApplicationController
     redirect_to :controller => 'projects', :action => 'settings', :id => @project, :tab => 'repository'
   end
   
-  def show
-    # check if new revisions have been committed in the repository
-    @repository.fetch_changesets if Setting.autofetch_changesets?
-    # root entries
-    @entries = @repository.entries('', @rev)    
-    # latest changesets
-    @changesets = @repository.changesets.find(:all, :limit => 10, :order => "committed_on DESC")
-    show_error_not_found unless @entries || @changesets.any?
-  end
-  
-  def browse
+  def show 
+    @repository.fetch_changesets if Setting.autofetch_changesets? && @path.empty?
+
     @entries = @repository.entries(@path, @rev)
     if request.xhr?
       @entries ? render(:partial => 'dir_list_content') : render(:nothing => true)
     else
       show_error_not_found and return unless @entries
+      @changesets = @repository.latest_changesets(@path, @rev)
       @properties = @repository.properties(@path, @rev)
-      render :action => 'browse'
+      render :action => 'show'
     end
   end
+
+  alias_method :browse, :show
   
   def changes
     @entry = @repository.entry(@path, @rev)
     show_error_not_found and return unless @entry
-    @changesets = @repository.changesets_for_path(@path, :limit => Setting.repository_log_display_limit.to_i)
+    @changesets = @repository.latest_changesets(@path, @rev, Setting.repository_log_display_limit.to_i)
     @properties = @repository.properties(@path, @rev)
   end
   
@@ -135,7 +130,7 @@ class RepositoriesController < ApplicationController
   end
   
   def revision
-    @changeset = @repository.changesets.find_by_revision(@rev)
+    @changeset = @repository.changesets.find(:first, :conditions => ["revision LIKE ?", @rev + '%'])
     raise ChangesetNotFound unless @changeset
 
     respond_to do |format|
@@ -199,17 +194,14 @@ private
     render_404
   end
   
-  REV_PARAM_RE = %r{^[a-f0-9]*$}
-  
   def find_repository
     @project = Project.find(params[:id])
     @repository = @project.repository
     render_404 and return false unless @repository
     @path = params[:path].join('/') unless params[:path].nil?
     @path ||= ''
-    @rev = params[:rev]
+    @rev = params[:rev].blank? ? @repository.default_branch : params[:rev].strip
     @rev_to = params[:rev_to]
-    raise InvalidRevisionParam unless @rev.to_s.match(REV_PARAM_RE) && @rev.to_s.match(REV_PARAM_RE)
   rescue ActiveRecord::RecordNotFound
     render_404
   rescue InvalidRevisionParam