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#!/usr/bin/env ruby
#
# fsplit.rb - split FASTA file by each n entries
#
# Copyright (C) 2001 KATAYAMA Toshiaki <k@bioruby.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# $Id: fsplit.rb,v 0.1 2001/06/21 08:22:29 katayama Exp $
#

if ARGV.length != 2

  print <<-USAGE
fsplit.rb - split FASTA file by each n entries
Usage :
% ./fsplit.rb 2000 seq.f
This will produce seq.f.1, seq.f.2, ... with containing 2000 sequences
in each file.

USAGE
  exit 1

end

count = ARGV.shift.to_i

i = -1

while gets
  if /^>/
    i += 1
    if i % count == 0
      n = i / count
      out = File.new("#{$FILENAME}.#{n+1}", "w+")
    end
  end
  out.print
end
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