Replace Rugments with Rouge

I have mainly created the rugments fork for the purpose of improving
gitlab's highlighting. Nowadays IMO it works way better than the old
highlight.js solution. But the development is stuck on my side because
of a couple of personal reasons:

  * I have finished my studies; last months I was writing my master
    thesis. So there was a huge time problem. I am sorry for that.

  * I had to move to Munich due to getting a (paid) job. Searching a
    flat here is horrible... :)

  * Last but not least, maintaining the same code base in two seperate
    projects is a mess.

I have decided to switch back to rouge due to several reasons:

  * In the beginning I was quite motivated, but since I start
    working on my new job next week, the best solution IMO is
    switching back to upstream rouge.

  * Rouge is continously improving:
    https://github.com/jneen/rouge/blob/master/CHANGELOG.md
    http://rouge.jneen.net/

  * There should be absolutely no regressions with this change. Most
    likely this pull request will almost fix some minor bugs.

  * One less gem in gitlab is a good thing. since Gitlab is quite a
    huge bundle of gems. Reducing complexity should be a major
    milestone.

Thanks a lot to @stanhu and @jneen for the review!

Gemfile

@@ -272,4 +272,3 @@ end
 gem "newrelic_rpm"
 
 gem 'octokit', '3.7.0'
-gem "rugments", "~> 1.0.0.beta8"

Gemfile.lock

@@ -579,7 +579,6 @@ GEM
     rubyntlm (0.5.0)
     rubypants (0.2.0)
     rugged (0.22.2)
-    rugments (1.0.0.beta8)
     safe_yaml (1.0.4)
     sanitize (2.1.0)
       nokogiri (>= 1.4.4)
@@ -836,7 +835,6 @@ DEPENDENCIES
   rqrcode-rails3
   rspec-rails (~> 3.3.0)
   rubocop (= 0.28.0)
-  rugments (~> 1.0.0.beta8)
   sanitize (~> 2.0)
   sass-rails (~> 4.0.5)
   sdoc

app/helpers/blob_helper.rb

@@ -1,6 +1,6 @@
 module BlobHelper
   def highlight(blob_name, blob_content, nowrap: false, continue: false)
-    @formatter ||= Rugments::Formatters::HTML.new(
+    @formatter ||= Rouge::Formatters::HTMLGitlab.new(
       nowrap: nowrap,
       cssclass: 'code highlight',
       lineanchors: true,
@@ -8,11 +8,11 @@ module BlobHelper
     )
 
     begin
-      @lexer ||= Rugments::Lexer.guess(filename: blob_name, source: blob_content).new
+      @lexer ||= Rouge::Lexer.guess(filename: blob_name, source: blob_content)
       result = @formatter.format(@lexer.lex(blob_content, continue: continue)).html_safe
     rescue
-      lexer = Rugments::Lexers::PlainText
-      result = @formatter.format(lexer.lex(blob_content)).html_safe
+      @lexer = Rouge::Lexers::PlainText
+      result = @formatter.format(@lexer.lex(blob_content)).html_safe
     end
 
     result

app/helpers/emails_helper.rb

@@ -31,8 +31,8 @@ module EmailsHelper
   end
 
   def color_email_diff(diffcontent)
-    formatter = Rugments::Formatters::HTML.new(cssclass: "highlight", inline_theme: :github)
-    lexer = Rugments::Lexers::Diff.new
+    formatter = Rouge::Formatters::HTML.new(css_class: 'highlight', inline_theme: 'github')
+    lexer = Rouge::Lexers::Diff
     raw formatter.format(lexer.lex(diffcontent))
   end
 

lib/redcarpet/render/gitlab_html.rb

@@ -22,10 +22,10 @@ class Redcarpet::Render::GitlabHTML < Redcarpet::Render::HTML
     ERB::Util.html_escape_once(text)
   end
 
-  # Stolen from Rugments::Plugins::Redcarpet as this module is not required
-  # from Rugments's gem root.
+  # Stolen from Rouge::Plugins::Redcarpet as this module is not required
+  # from Rouge's gem root.
   def block_code(code, language)
-    lexer = Rugments::Lexer.find_fancy(language, code) || Rugments::Lexers::PlainText
+    lexer = Rouge::Lexer.find_fancy(language, code) || Rouge::Lexers::PlainText
 
     # XXX HACK: Redcarpet strips hard tabs out of code blocks,
     # so we assume you're not using leading spaces that aren't tabs,
@@ -34,7 +34,7 @@ class Redcarpet::Render::GitlabHTML < Redcarpet::Render::HTML
       code.gsub!(/^    /, "\t")
     end
 
-    formatter = Rugments::Formatters::HTML.new(
+    formatter = Rouge::Formatters::HTMLGitlab.new(
       cssclass: "code highlight #{@color_scheme} #{lexer.tag}"
     )
     formatter.format(lexer.lex(code))