Colorful Ruby code for your blog

Found out about this nice gem that does syntax highlighting of Ruby code (and C, Delphi, HML, RHML and Nitro-HTML for now) and outputs it as a stand-alone HTML. Perfect for blogging. I had found some other one some time ago that needed javascript, and it’s not every blogging service that lets you add that kinda stuff to your posts.

There are many configurable options, other types of output and stuff, you can find all that (very well documented) at CodeRay’s website.

So as a try-out, here’s the output of a little script to color ruby code, run on itself:

 1 #!/usr/bin/env ruby
 2 require 'rubygems'
 3 require 'coderay'
 4
 5 if ARGV.length != 1
 6   puts "Wrong number of arguments. Use: color_html <source_file>"
 7   exit
 8 end
 9
10 rb_file = File.expand_path(ARGV[0])
11 if rb_file.split('.')[-1] != 'rb'
12   puts "Not a .rb file"
13   exit
14 end
15
16 html_file = rb_file.split('.')[0..-2].join('.') << '.html'
17 if File.exists? html_file
18   puts "File #{html_file} exists. nOverwrite it? (y/N)"
19   # need to make STDIN explicit because there's a filename in the 
20   # command-line argument (gets defaults to reading from it)
21   if STDIN.gets.strip == 'y'
22     File.delete(html_file)
23   else
24     exit(true)
25   end
26 end
27
28 File.open(html_file,'w') do |f|
29   f << CodeRay.encode(
30          File.read(rb_file),
31          :ruby,
32          :html,
33          :line_numbers => :inline,
34          :hint => :info,
35          :css => :style,
36          :wrap => :div
37        )
38 end
39
40 puts "Done! Thanks for coming! =)"