split_pipes


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#!/usr/bin/env ruby

require 'trollop'

STDIN.set_encoding 'utf-8'
STDOUT.set_encoding 'utf-8'

cfg = Trollop::options do
  banner "splitpipes -f <n> < <input>"
  opt :field, "field", :type => :int, :required => true
  opt :to,    "to",    :type => :int, :default => nil
end


a = []
range = false
if cfg[:to]
  range = true
end

if range
  if cfg[:field] >= cfg[:to]
    STDERR.write "field >= to, exiting\n"
    exit
  end
end

if cfg[:field]<=0 || (range && cfg[:to]<=0)
  STDERR.write "field or to <= 0, exiting"
  exit
end

while line = STDIN.gets
  j = 1
  line.strip.split(' ||| ').each { |i|
    if range && (cfg[:field]..cfg[:to]).include?(j)
      a << i.strip
    elsif j == cfg[:field] 
      puts i.strip
      break
    end
    j += 1
  }
  if range
    puts "#{a.join " ||| "}\n"
  end
  a.clear
end