Syntax highlight selected code for pasting in emails. Requires xclip.

fmail_coderay.rb

#!/usr/bin/env ruby

# Format code with syntax highlighting for pasting in emails.
# To use:
# 1) Highlight the code.
# 2) fmail ruby/sql/java_script etc...
# 3) Middle-click in email to paste html code.

require 'coderay'
require 'open3'

is_irb = false

begin
  str = `xclip -o` # Requires xclip
rescue Errno::ENOENT
  puts "\"xclip\" is not installed."
  exit 1
end

opts = [:sql, :html, :ruby, :c, :css, :debug, :delphi,
        :diff, :groovy, :html, :java, :javascript, :js,
        :json, :php, :python, :rhtml, :ruby, :scheme,
        :sql, :text, :xhtml, :xml, :yaml]

opt = ARGV[0]
if opt.nil?
  puts "Supply the syntax type as an argument - one of:\n\n\t#{opts.sort.join("\n\t")}"
  exit 1
end

fmt = case opt.to_sym
  when *opts
    opt.to_sym
  when :irb
    is_irb = true
    :ruby
  else
    puts "Unknown syntax: \"#{opt}\"" #:ruby
    exit 1
  end
fmt = :java_script if fmt == :javascript || fmt == :js

if is_irb
  new = []
  arb4 = str.split("\n")
  arb4.each do |a| 
    b = a.match(/^.+?>/)[0]
    c = b =~ /.*=>/ ? '<span style="background-color:#ffff00;color:#00f">=></span>' : ''
    new << (c << CodeRay.encode(a.sub(b, ''), fmt, :html, :css => :style) << "<br />")
  end
  output = "<pre>#{new.join("\n")}</pre>"
else
  output = "<pre>#{CodeRay.encode(str, fmt, :html, :css => :style).gsub("\n", "<br />")}</pre>"
end

# Pipe output to xclip...
Open3.popen2e("xclip") {|i,o,t|
  i << output
  i.close
}