#!/usr/bin/mawk -We
# *********************************************************************
# renamecol: rename a table column.
# 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: renamecol,v 1.3 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] == "-f" || ARGV[i] == "--first-only") first_only = 1
     else if (ARGV[i] == "-h" || ARGV[i] == "--help") {
	system("grep -v '^#' " nosql_install "/help/renamecol.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 old_new[++j] = ARGV[i]
  }

  # Support the old calling interface 'rename name1 name2'.

  if (j == 2 && old_new[1] !~ /,/) {
     old_new_tmp = old_new[1] "," old_new[2]
     delete old_new
     old_new[1] = old_new_tmp
  }

  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 {

  gsub(/\001/, "")			# Remove SOH markers.

  gsub(/ +/,"")				# trim blanks in names.

  # Load the column position array.
  while (++p <= NF) { P[$p] = p; N[p] = $p; }

  # Now turn old names into new names in the header.
  i=0
  while (N[++i] != "") {
    j=0
    while (split(old_new[++j],a,",") == 2) {
    	  if (N[i] == a[1]) {
	     N[i] = a[2]
	     if (first_only) {
		renamed = 1
		break
	     }
	  }
    }
    if (first_only && renamed) break
  }

  while (N[++x] != NULL) out_rec = out_rec OFS N[x]

  # Remove leading extra OFS from out_rec, then print header.
  sub(/^\t/, "", out_rec)
  printf("\001"); gsub(/\t/,"\t\001", out_rec); print out_rec > o_file
}

# Table body.
NR > 1 { print > o_file }

# End of program.
