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Albert Davidson Chou Snippet ID Download Version Date Posted Author Delete 178 0.1 2006-09-04 05:52 Albert Davidson Chou

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Latest Snippet Version: :0.1

#!/usr/bin/env ruby -w

def usage
  puts "usage:  #{File.basename( __FILE__ )} file_to_split regular_expression_identifying_lines_to_split_at"
end

if ARGV.length != 2 then
  usage
  exit( 1 )
else
  @file_to_split = ARGV[0]
  @expression_identifying_lines_to_split_at = ARGV[1]
end

regular_expression_identifying_lines_to_split_at = Regexp.new( @expression_identifying_lines_to_split_at )

output_file = nil
output_file_name_counter = 0
File.open( @file_to_split ) { |file|
  file.each { |line|
    # If the current line matches the pattern of the delimiting line, create a new output file.
    create_new_output_file = ( line =~ regular_expression_identifying_lines_to_split_at )

    if create_new_output_file then
      # If there is currently an output file open, close it.
      if ! output_file.nil? then
        output_file.close
      end

      # Increment the filename extension counter and create the new output file.
      output_file_name_counter += 1
      output_file = File.open( "#{@file_to_split}.#{output_file_name_counter}", 'w' )
    end

    output_file.print( line )
  }
}
		

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