#!/usr/bin/mawk -We
# *********************************************************************
# addcolumn: append new empty columns to a NoSQL table.
# Copyright (c) 1998,2006 Carlo Strozzi
#
# 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; version 2 dated June, 1991.
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# $Id: addcolumn,v 1.5 2006/03/10 11:26:13 carlo Exp $
# *********************************************************************

BEGIN {
  NULL = ""; FS = OFS = "\t"

  # Get local settings.
  nosql_install = ENVIRON["NOSQL_INSTALL"]
  stdout = ENVIRON["NOSQL_STDOUT"]
  stderr = ENVIRON["NOSQL_STDERR"]

  # Set default values if necessary.
  if (nosql_install == NULL) nosql_install = "/usr/local/nosql"
  if (stdout == NULL) stdout = "/dev/stdout"
  if (stderr == NULL) stderr = "/dev/stderr"

  while (ARGV[++i] != NULL) {
     if (ARGV[i] == "-i" || ARGV[i] == "--input") i_file = ARGV[++i]
     else if (ARGV[i] == "-o" || ARGV[i] == "--output") o_file = ARGV[++i]
     else if (ARGV[i] == "-p" || ARGV[i] == "--prime") prime = ARGV[++i]
     else if (ARGV[i] == "-h" || ARGV[i] == "--help") {
	system("grep -v '^#' " nosql_install "/help/addcolumn.txt")
	exit(rc=1)
     }
     else if (ARGV[i] == "--show-copying") {
	system("cat " nosql_install "/doc/COPYING")
	exit(rc=1)
     }
     else if (ARGV[i] == "--show-warranty") {
	system("cat " nosql_install "/doc/WARRANTY")
	exit(rc=1)
     }
     else new_cols[++j] = ARGV[i]
  }

  ARGC = 1					# Fix argv[]

  if (o_file == NULL) o_file = stdout
  if (i_file != NULL) { ARGV[1] = i_file; ARGC = 2 }
}

#
# Main loop
#

NR == 1 {
  i = 0
  while (new_cols[++i] != NULL) {
    $0 = $0 OFS "\001" new_cols[i]
    padding = padding OFS
  }

  # Remove extra OFS from the beginning of header.

  sub(/^\t/, NULL, $0)
  sub(/^\t/, NULL, padding)

  # print header (if not null).

  if ($0 != NULL) { print > o_file }
}

NR > 1 {
   gsub(/\t/,"\t" prime, padding)
   print $0, prime padding > o_file
}

# End of program.
