Add albino.rb, a wrapper for pygments written by Chris Wanstrath.

Author: tobie

vendor/albino.rb

@@ -0,0 +1,122 @@
+##
+# Wrapper for the Pygments command line tool, pygmentize.
+#
+# Pygments: http://pygments.org/
+#
+# Assumes pygmentize is in the path.  If not, set its location
+# with Albino.bin = '/path/to/pygmentize'
+#
+# Use like so:
+#
+#   @syntaxer = Albino.new('/some/file.rb', :ruby)
+#   puts @syntaxer.colorize
+#
+# This'll print out an HTMLized, Ruby-highlighted version
+# of '/some/file.rb'.
+#
+# To use another formatter, pass it as the third argument:
+#
+#   @syntaxer = Albino.new('/some/file.rb', :ruby, :bbcode)
+#   puts @syntaxer.colorize
+#
+# You can also use the #colorize class method:
+#
+#   puts Albino.colorize('/some/file.rb', :ruby)
+#
+# Another also: you get a #to_s, for somewhat nicer use in Rails views.
+#
+#   ... helper file ...
+#   def highlight(text)
+#     Albino.new(text, :ruby)
+#   end
+#
+#   ... view file ...
+#   <%= highlight text %>
+#
+# The default lexer is 'text'.  You need to specify a lexer yourself;
+# because we are using STDIN there is no auto-detect.
+#
+# To see all lexers and formatters available, run `pygmentize -L`.
+#
+# Chris Wanstrath // [email protected]
+#         GitHub // http://github.com
+#
+require 'open4'
+
+class Albino
+  @@bin = Rails.development? ? 'pygmentize' : '/usr/bin/pygmentize' rescue 'pygmentize'
+
+  def self.bin=(path)
+    @@bin = path
+  end
+
+  def self.colorize(*args)
+    new(*args).colorize
+  end
+
+  def initialize(target, lexer = :text, format = :html)
+    @target  = File.exists?(target) ? File.read(target) : target rescue target
+    @options = { :l => lexer, :f => format, :O => 'encoding=utf-8' }
+  end
+
+  def execute(command)
+    output = ''
+    Open4.popen4(command) do |pid, stdin, stdout, stderr|
+      stdin.puts @target
+      stdin.close
+      output = stdout.read.strip
+      [stdout, stderr].each { |io| io.close }
+    end
+    output
+  end
+
+  def colorize(options = {})
+    html = execute(@@bin + convert_options(options))
+    # Work around an RDiscount bug: http://gist.github.com/97682
+    html.to_s.sub(%r{</pre></div>\Z}, "</pre>\n</div>")
+  end
+  alias_method :to_s, :colorize
+
+  def convert_options(options = {})
+    @options.merge(options).inject('') do |string, (flag, value)|
+      string + " -#{flag} #{value}"
+    end
+  end
+end
+
+if $0 == __FILE__
+  require 'rubygems'
+  require 'test/spec'
+  require 'mocha'
+  begin require 'redgreen'; rescue LoadError; end
+
+  context "Albino" do
+    setup do
+      @syntaxer = Albino.new(__FILE__, :ruby)
+    end
+
+    specify "defaults to text" do
+      syntaxer = Albino.new(__FILE__)
+      syntaxer.expects(:execute).with('pygmentize -f html -l text').returns(true)
+      syntaxer.colorize
+    end
+
+    specify "accepts options" do
+      @syntaxer.expects(:execute).with('pygmentize -f html -l ruby').returns(true)
+      @syntaxer.colorize
+    end
+
+    specify "works with strings" do
+      syntaxer = Albino.new('class New; end', :ruby)
+      assert_match %r(highlight), syntaxer.colorize
+    end
+
+    specify "aliases to_s" do
+      assert_equal @syntaxer.colorize, @syntaxer.to_s
+    end
+
+    specify "class method colorize" do
+      assert_equal @syntaxer.colorize, Albino.colorize(__FILE__, :ruby)
+    end
+  end
+end