Replace more usages of linguist with rouge

README.md

@@ -171,12 +171,12 @@ EmojiPipeline = Pipeline.new [
 
 Filter gem dependencies are not bundled; you must bundle the filter's gem
 dependencies. The below list details filters with dependencies. For example,
-`SyntaxHighlightFilter` uses [github-linguist](https://github.com/github/linguist)
+`SyntaxHighlightFilter` uses [rouge](https://github.com/jneen/rouge)
 to detect and highlight languages. For example, to use the `SyntaxHighlightFilter`,
 add the following to your Gemfile:
 
 ```ruby
-gem 'github-linguist'
+gem 'rouge'
 ```
 
 * `AutolinkFilter` - `rinku`
@@ -185,7 +185,7 @@ gem 'github-linguist'
 * `MarkdownFilter` - `commonmarker`
 * `PlainTextInputFilter` - `escape_utils`
 * `SanitizationFilter` - `sanitize`
-* `SyntaxHighlightFilter` - `github-linguist`
+* `SyntaxHighlightFilter` - `rouge`
 * `TextileFilter` - `RedCloth`
 
 _Note:_ See [Gemfile](/Gemfile) `:test` block for version requirements.

bin/html-pipeline

@@ -41,9 +41,9 @@ if ARGV.empty?
     HTML::Pipeline::TableOfContentsFilter
   ]
 
-  # Add syntax highlighting if linguist is present
+  # Add syntax highlighting if rouge is present
   begin
-    require 'linguist'
+    require 'rouge'
     filters << HTML::Pipeline::SyntaxHighlightFilter
   rescue LoadError
   end

gemfiles/rails_3.gemfile

@@ -20,7 +20,7 @@ group :test do
   gem "email_reply_parser", "~> 0.5", :require => false
   gem "sanitize", "~> 2.0", :require => false
   gem "escape_utils", "~> 1.0", :require => false
-  gem "github-linguist", "~> 2.10", :require => false
+  gem "rouge", "~> 3.1", :require => false
 end
 
 gemspec :path => "../"

gemfiles/rails_4.gemfile

@@ -20,7 +20,7 @@ group :test do
   gem "email_reply_parser", "~> 0.5", :require => false
   gem "sanitize", "~> 2.0", :require => false
   gem "escape_utils", "~> 1.0", :require => false
-  gem "github-linguist", "~> 2.10", :require => false
+  gem "rouge", "~> 3.1", :require => false
 end
 
 gemspec :path => "../"

gemfiles/rails_5.gemfile

@@ -19,7 +19,7 @@ group :test do
   gem "email_reply_parser", "~> 0.5", :require => false
   gem "sanitize", "~> 2.0", :require => false
   gem "escape_utils", "~> 1.0", :require => false
-  gem "github-linguist", "~> 2.10", :require => false
+  gem "rouge", "~> 3.1", :require => false
 end
 
 gemspec :path => "../"