From: James Gray <james@...>
Date: 2008-03-26T06:16:59+09:00
Subject: Re: golf: tabs to bullets

On Mar 25, 2008, at 4:02 PM, Martin DeMello wrote:

> Given:
>  an outline list, with each line indented by a series of tabs
>  a list of bullets (assume a circular list, for simplicity)
>
> Write a function that replaces every tab with two spaces, except for
> the last one, which is replaced by a bullet.
>
> example:
>
> input file:
> foo
> \t bar
> \t \t baz
> \t \t \t hello
> \t \t world
>
> bullets: %w(* - o x)
>
> output (view in fixed width):
> foo
> * bar
>  - baz
>    o hello
>  - world

I didn't really golf it, but my answer is:

#!/usr/bin/env ruby -wKU

input = <<END_INPUT
foo
\t bar
\t \t baz
\t \t \t hello
\t \t world
END_INPUT

bullets = %w[* - o x]
input.gsub!(/^(\t ?)+/) do |indent|
   tabs = indent.count("\t") - 1
   "  " * tabs + bullets[tabs] + " "
end

puts input

__END__

James Edward Gray II