Track path changes in History. Resolves #1441 (#1443)

* Track path changes in History.
* Reactivate rename following on JRuby

Gemfile

@@ -1,10 +1,7 @@
 source 'https://rubygems.org'
 
 if RUBY_PLATFORM == 'java'
-  gem 'gollum-rjgit_adapter', :git => 'https://github.com/gollum/rjgit_adapter' # For development purposes
   gem 'warbler'
-else
-  gem 'gollum-rugged_adapter', :git => 'https://github.com/gollum/rugged_adapter.git' # For development purposes
 end
 
 gem 'gollum-lib', :git => 'https://github.com/gollum/gollum-lib.git', :branch => 'gollum-lib-5.x' # For development purposes

lib/gollum/app.rb

@@ -92,7 +92,7 @@ module Precious
       @redirects_enabled = settings.wiki_options.fetch(:redirects_enabled, true)
       @per_page_uploads = settings.wiki_options[:per_page_uploads]
 
-      forbid unless @allow_editing || request.request_method == "GET"
+      forbid unless @allow_editing || request.request_method == 'GET'
       Precious::App.set(:mustache, {:templates => settings.wiki_options[:template_dir]}) if settings.wiki_options[:template_dir]
 
       @base_url = url('/', false).chomp('/').force_encoding('utf-8')
@@ -129,7 +129,7 @@ module Precious
         env['PATH_INFO'].sub!("/#{Precious::Assets::ASSET_URL}", '')
         if @use_static_assets
           env['PATH_INFO'].sub!(Sprockets::Helpers.prefix, '') if @base_url
-          not_found_msg = "Not found." 
+          not_found_msg = 'Not found.'
           not_found = Proc.new {[404, {'Content-Type' => 'text/html', 'Content-Length' => not_found_msg.length.to_s}, [not_found_msg]]}
           Rack::Static.new(not_found, {:root => @static_assets_path, :urls => ['']}).call(env)
         else
@@ -210,7 +210,7 @@ module Precious
           dir = dir.sub(wiki.base_path, '') if wiki.base_path
           # remove file extension 
           dir = dir.sub(::File.extname(dir), '')
-          dir = ::File.join("uploads", dir)
+          dir = ::File.join('uploads', dir)
         else
           # store all uploads together
           dir = 'uploads'
@@ -324,8 +324,8 @@ module Precious
       get '/create/*' do
         forbid unless @allow_editing
         if settings.wiki_options[:template_page] then
-          temppage = wiki_page("/_Template")
-          @template_page = (temppage.page != nil) ? temppage.page.raw_data : "Template page option is set, but no /_Template page is present or committed."
+          temppage = wiki_page('/_Template')
+          @template_page = (temppage.page != nil) ? temppage.page.raw_data : 'Template page option is set, but no /_Template page is present or committed.'
         end
         wikip = wiki_page(params[:splat].first)
         @name = wikip.name.to_url
@@ -380,8 +380,8 @@ module Precious
         else
           sha2, sha1 = sha1, "#{sha1}^" if !sha2
           @versions  = [sha1, sha2]
-          @diff      = wiki.full_reverse_diff_for(@page, @versions.first, @versions.last)
-          @message   = "The patch does not apply."
+          @diff      = wiki.repo.diff(@versions.first, @versions.last, @page.path)
+          @message   = 'The patch does not apply.'
           mustache :compare
         end
       end
@@ -416,8 +416,7 @@ module Precious
           @versions = @page.versions(
             per_page: @max_count,
             page_num: @page_num,
-            follow: settings.wiki_options.fetch(:follow_renames,
-              ::Gollum::GIT_ADAPTER == 'rjgit' ? false : true)
+            follow: settings.wiki_options.fetch(:follow_renames, true)
           )
           mustache :history
         else
@@ -461,8 +460,13 @@ module Precious
         @versions = [start_version, end_version]
         wiki      = wikip.wiki
         @page     = wikip.page
-        @diff     = wiki.full_reverse_diff_for(@page, @versions.first, @versions.last)
-        mustache :compare
+        @diff     = wiki.repo.diff(@versions.first, @versions.last, @page.path)
+        if @diff.empty?
+          @message = 'Could not compare these two revisions, no differences were found.'
+          mustache :error
+        else
+          mustache :compare
+        end
       end
 
       get '/search' do
@@ -620,4 +624,4 @@ module Precious
     end
 
   end
-end
+end

lib/gollum/templates/compare.mustache

@@ -16,10 +16,10 @@
 				<form name="gollum-revert" action="{{revert_path}}/{{escaped_url_path}}/{{before}}/{{after}}" method="post" id="gollum-revert-form"></form>
 				<span class="pb-4">
 					<button class="btn btn-sm" type="submit" onclick="$('#gollum-revert-form').submit()">Revert Changes</button>
-					<a href="{{history_path}}/{{escaped_url_path}}" class="btn btn-sm action-page-history">Back to Page History</a>
 				</span>
 		    {{/allow_editing}}
 		  {{/show_revert}}
+			<a href="{{history_path}}/{{escaped_url_path}}" class="btn btn-sm action-page-history">Back to Page History</a>
 		</div>
 
 	  <div class="Box data highlight">

lib/gollum/templates/history.mustache

@@ -18,7 +18,7 @@
 					<span class="float-left col-2" id="user-icons">{{>author_template}}</span>
 					<span class="flex-auto col-1 text-gray-light">{{date}}</span>
 					<span class="flex-auto col-5">{{message}}</span>
-					<span class="pl-4 float-right">[<a href="{{base_url}}/{{escaped_url_path}}/{{id}}" title="View commit">{{id7}}</a>]</span>
+					<span class="pl-4 float-right">[<a href="{{base_url}}/{{filename}}/{{id}}" title="View commit">{{id7}}</a>]</span>
 				</li>
 				{{/versions}}
 			</ul>

lib/gollum/views/compare.rb

@@ -19,11 +19,15 @@ module Precious
 
       def lines
         lines = []
-        @diff.split("\n")[2..-1].each_with_index do |line, line_index|
+        lines_to_parse = @diff.split("\n")[4..-1]
+        # If the diff is of a rename, the diff header will be one line longer than normal because it will contain a line starting with '+++' to indicate the 'new' filename.
+        # Make sure to skip that header line if it is present.
+        lines_to_parse = lines_to_parse[1..-1] if lines_to_parse[0].start_with?('+++')
+        lines_to_parse.each_with_index do |line, line_index|
           lines << { :line  => line,
                      :class => line_class(line),
-                     :ldln  => left_diff_line_number(0, line),
-                     :rdln  => right_diff_line_number(0, line) }
+                     :ldln  => left_diff_line_number(line),
+                     :rdln  => right_diff_line_number(line) }
         end if @diff
         lines
       end
@@ -48,7 +52,7 @@ module Precious
 
       @left_diff_line_number = nil
 
-      def left_diff_line_number(id, line)
+      def left_diff_line_number(line)
         if line =~ /^@@/
           m, li                  = *line.match(/\-(\d+)/)
           @left_diff_line_number = li.to_i
@@ -70,7 +74,7 @@ module Precious
 
       @right_diff_line_number = nil
 
-      def right_diff_line_number(id, line)
+      def right_diff_line_number(line)
         if line =~ /^@@/
           m, ri                   = *line.match(/\+(\d+)/)
           @right_diff_line_number = ri.to_i

lib/gollum/views/history.rb

@@ -25,6 +25,7 @@ module Precious
             :message   => v.message.respond_to?(:force_encoding) ? v.message.force_encoding('UTF-8') : v.message,
             :date      => v.authored_date.strftime("%B %d, %Y"),
             :user_icon => self.user_icon_code(v.author.email),
+            :filename  => path_for_version(v.tracked_pathname),
             :date_full => v.authored_date,
           }
         end
@@ -33,6 +34,15 @@ module Precious
       def editable
         @editable
       end
+
+      private
+
+      def path_for_version(pathname)
+        @preview_page ||= Gollum::PreviewPage.new(@wiki, '', '', nil)
+        @preview_page.path = pathname ? pathname : @name
+        @preview_page.escaped_url_path
+      end
+
     end
   end
 end

test/test_app.rb

@@ -19,7 +19,6 @@ context "Frontend" do
     assert_equal 'μ†ℱ'.scan(/./), ["μ", "†", "ℱ"]
   end
 
-
   test "broken four space" do
     page = 'utfh1'
     text = %(
@@ -468,6 +467,12 @@ context "Frontend" do
     post "/gollum/preview", :content => 'abc', :format => 'markdown'
     assert last_response.ok?
   end
+  
+  test 'throws an error when comparing two identical revisions for a page' do
+    get '/gollum/compare/A.md/fc66539528eb96f21b2bbdbf557788fe8a1196ac...fc66539528eb96f21b2bbdbf557788fe8a1196ac'
+    assert last_response.ok?
+    assert last_response.body.include?('Could not compare these two revisions, no differences were found.')
+  end
 
 =begin
   # Grit is broken.