convert ruby code formated 'a la python' to regular ruby code

rupy.rb

####
#### transform ruby/dsl code with tabulation 
#### block (a la python)to ruby block
####
if ARGV.size!=1 || !File.exists?(ARGV[0])
	puts "Usage: > ruby #{$0} filename"
	exit(1)
end

last_indent,no,h,last_key=0,0,{},""
sbegin=%w{
	class module def
	begin rescue finaly
	if unless while case until
}.inject({}) { |h,k|  h[k]=true;h }

puts File.read(ARGV.shift)
		.gsub(/\n\s*\n/,"\n")
		.gsub(/\n\s*#[^\n]\n/,"\n")
		.concat("\n;")
		.split(/(\s*)([^\n]*)\n?/)
		.each_slice(3)
		.map          { |x,start,line|
	next unless start && line
	puts "'%s'%-50s %d / '%s'" % [start,line,start.size,last_key] if $DEBUG

	indent=start.size
	delta=last_indent-indent
	line0=line

	if delta>0
		line = ((1..delta).each.inject("") {|s,i| s<<start+("\t"*(delta-i))+"end\n"})+start+line
	end
	h[no]=1 if delta==-1 && (! sbegin[last_key]) && line.split('|').size<2
	raise("error indentation line #{no}") if delta<-1
	
	last_key=line0.scan(/\w+/)[0]
	last_indent=indent
	no+=1
	p line if $DEBUG
	start+line+" __##{no}#__ "
}.join("\n")
 .gsub(/__#\d+#__/) { |m| n=m[3..-4].to_i ; h[n] ? "do" : "" }