New feature: HTML encode option :highlight_lines. See documentation.

* The scanner test suite uses it and highlights the lines that
  differ after a failed complete test in *.actual.html.

2 files changed, 22 insertions, 1 deletions

diff --git a/lib/coderay/encoders/html.rb b/lib/coderay/encoders/html.rb
index 035ee65..f7f99f7 100644
--- a/lib/coderay/encoders/html.rb
+++ b/lib/coderay/encoders/html.rb
@@ -56,6 +56,16 @@ module Encoders
   #
   # Default: 10
   #
+  # === :highlight_lines
+  # 
+  # Highlights certain line numbers now by using the :highlight_lines option.
+  # Can be any Enumerable, typically just an Array or Range, of numbers.
+  # 
+  # Bolding is deactivated when :highlight_lines is set. It only makes sense
+  # in combination with :line_numbers.
+  #
+  # Default: nil
+  #
   # === :hint
   # Include some information into the output using the title attribute.
   # Can be :info (show token type on mouse-over), :info_long (with full path)
@@ -82,6 +92,7 @@ module Encoders
       :line_numbers => nil,
       :line_number_start => 1,
       :bold_every => 10,
+      :highlight_lines => nil,
 
       :hint => false,
     }
diff --git a/lib/coderay/encoders/html/numerization.rb b/lib/coderay/encoders/html/numerization.rb
index 9f1667f..0b6cf7a 100644
--- a/lib/coderay/encoders/html/numerization.rb
+++ b/lib/coderay/encoders/html/numerization.rb
@@ -32,9 +32,19 @@ module Encoders
         #end
 
         bold_every = options[:bold_every]
+        highlight_lines = options[:highlight_lines]
         bolding =
-          if bold_every == false
+          if bold_every == false && highlight_lines == nil
             proc { |line| line.to_s }
+          elsif highlight_lines.is_a? Enumerable
+            highlight_lines = highlight_lines.to_set
+            proc do |line|
+              if highlight_lines.include? line
+                "<strong class=\"highlighted\">#{line}</strong>"  # highlighted line numbers in bold
+              else
+                line.to_s
+              end
+            end
           elsif bold_every.is_a? Integer
             raise ArgumentError, ":bolding can't be 0." if bold_every == 0
             proc do |line|