#!/usr/bin/env ruby

require 'fileutils'

INTERPOLATOR_TOKEN = /%\d+s/

# puts interpolate(['world', 'other world'], 'hello %1s')
def interpolate(values, template) 
  copy = "#{template}"
  copy.scan(INTERPOLATOR_TOKEN).each do |interpolator|
    needle = interpolator.scan(/\d+/).first.to_i
    value = (values[needle - 1] || 'n/a')
    copy.gsub!(interpolator, value)
  end
  copy
end

if ARGV[0]
  template = "#{ARGV[0]}"
  if File.exists?(template)
    template = File.read(template)
  end
end

STDIN.each_line do |line|

  if line =~ /\t/
    values = line.chomp.split(/\t/)
  else
    values = line.chomp.split(/\s+/)
  end

  unless ARGV[1]
    STDOUT.puts interpolate(values, template)
    next
  end

  fname = interpolate(values, ARGV[1])
  dir = File.dirname(fname)
  unless File.directory?(dir)
    # puts "creating #{dir}"
    FileUtils.mkdir_p(dir)
  end
  File.open(fname, 'w+') do |file|
    file.puts interpolate(values, template)
  end
end