ruby source code identer

gistfile1.rb

#!/usr/bin/env ruby

#
# ruby source code indenter
#
# need ruby 1.9.3
# need a lot of refactoring!!!(but too tired now)
#
#

src = ARGF.read
l_max = r_max = 0
space_max = 0

REGEX = /^(\s*)(.+?)\s*(=>|=)\s*(.+?)\s*(#[^"]+)?$/

def print_size(string)
  string.each_char.map{|c| c.bytesize == 1 ? 1 : 2}.reduce(0, &:+)
end

def ljust_print_size(string, size)
  padding_size = size - print_size(string)
  padding_size = 0 if size < 0
  string + (' ' * padding_size)
end

#src.scan(REGEX) do
src.each_line do |line|
  if line =~ REGEX
    space_max = [space_max,$1.length].max
    r_max = [r_max, print_size($4) + $3.length].max
    l_max = [l_max, print_size($2)].max
  end
end

ar = []
src.each_line do |line|
  ar << line.strip.gsub(REGEX) do
    if $5.nil?
      "%s%s%-#{l_max}s %s %s" % [(' ' * space_max), $1, $2, $3, $4]
    else
      minus = $3.length - 1
      "%s%s%-#{l_max}s %s #{ljust_print_size($4,r_max - minus)}%s" % [(' ' * space_max), $1, $2, $3, $5]
    end
  end 
end
print ar.join("\n")

#src.gsub!(REGEX) do
#  if $5.nil?
#    "%-#{l_max}s %s %s" % [ $2, $3, $4]
#  else
#    "%-#{l_max}s %s %-#{r_max}s %s" % [ $2, $3, $4, $5]
#  end
#end
#print src