ansi2html

#!/usr/bin/env ruby
# Usage: ansi2html [-w] [--css]
#
# Convert terminal color ANSI escape sequences to HTML.
#
#   -w    : wrap HTML output in PRE tags
#   -css  : include CSS styles
#
# Examples:
#
#   $ git log --oneline --decorate -10 --color | ansi2html
#
#   $ ruby -e '30.upto(37) {|n| puts "\e[#{n}mHi \e[1;#{n}mho\e[m" }' | ansi2html
#
# Author: Mislav Marohnić

require 'cgi'

if ARGV.include?('-h') || ARGV.include?('--help')
  File.open(__FILE__, 'r') do |source|
    source.each do |line|
      case line
      when /^#!/ then next
      when /^#/ then puts line.sub(/^# ?/, '')
      else break
      end
    end
  end
  exit 0
end

wrap = ARGV.delete('-w')
css = ARGV.delete('--css')
data = ARGF.read
out = $stdout

COLORS = [
  %w[black black #818383],
  %w[red #BA3521 #F9391F],
  %w[green #25BC22 #31E722],
  %w[yellow #ADAD27 #EAEC23],
  %w[blue #3D2EE2 #562FE2],
  %w[magenta #AE38D4 #F935F7],
  %w[cyan #2BB9C9 #14F0F0],
  %w[white #DEDFE1 #E9EBEB],
]

def classnames(code)
  codes = code.split(';').map { |c| c.to_i }
  codes.delete(0)
  if color_code = codes.find { |c| c.between?(30, 37) }
    codes.delete(color_code)
    codes << COLORS[color_code - 30][0]
  end
  codes << 'bright' if codes.delete(1)
  codes.map { |c| "ansi-#{c}" }.join(' ')
end

open = false

out << "<pre class='ansi'>" if wrap
# replace escape sequences with SPAN tags
out << CGI.escapeHTML(data.rstrip).gsub(/\e\[ ([\d;]*)m /x) {
  opentag = $1.empty?? nil : "<span class='#{classnames($1)}'>"
  closetag = open ? '</span>' : nil
  open = !!opentag
  "#{closetag}#{opentag}"
}
out << "</pre>" if wrap
out << "\n"

if css
  out.puts "\n<style type=\"text/css\">"
  out.puts "  pre.ansi { color: #DEDFE1; background-color: #010101; }"
  COLORS.map do |name, normal, bright|
    out.puts "  pre.ansi .ansi-#{name} { color: #{normal}; }"
    out.puts "  pre.ansi .ansi-#{name}.ansi-bright { color: #{bright}; }"
  end
  out.puts "</style>"
end