#!/usr/bin/mawk -We
# *********************************************************************
# number: inserts a unique record identifier into a table.
# Copyright (c) 2001,2002,2003 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; 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.
#
# 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: number,v 1.3 2003/10/09 10:53:30 carlo Exp $

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

  # 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] == "-l" || ARGV[i] == "--last") pick_last = 1
    else if (ARGV[i] == "-N" || ARGV[i] == "--no-header") no_hdr = 1
    else if (ARGV[i] == "-K" || ARGV[i] == "--key") key_name = ARGV[++i]
    else if (ARGV[i] == "-d" || ARGV[i] == "--delimiter") dlm = ARGV[++i]
    else 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] == "-s" || ARGV[i] == "--start") start = ARGV[++i]
    else if (ARGV[i] == "-h" || ARGV[i] == "--help") {
       system("grep -v '^#' " nosql_install "/help/number.txt")
       rc = 1
       exit(rc)
    }
    else target_cols[ARGV[i]] = 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 {

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

  # Load the column position array.
  while (++p <= NF) {

    # Unless '-l' was specified, make sure we pick the first occurrence
    # of duplicated column names (it may happen after a join).

    if (P[$p] == NULL) auto_col = auto_col " " $p

    if (pick_last) { P[$p] = p; N[p] = $p }
    else {
      if (P[$p] == NULL) { P[$p] = p; N[p] = $p }
    }
  }

  $0 = key_name OFS $0			# Insert the key column.
  if (!no_hdr) {
     printf("\001"); gsub(/\t/,"\t\001"); print > o_file
  }
  next
}

# Table body.
{
  out = k = NULL
  for (i=1; i<=NF; i++) {
      if (i > 1) out = out OFS
      if (target_cols[N[i]] != NULL) {
	 if ($i == NULL)
	    print "number: invalid N[i]=NULL at record No. " \
	    NR-2 > stderr
	 if (k != NULL) k = k dlm
	 k = k $i
      }
      out = out $i
  }
  if (k == NULL) k = NR-2+start	# Resort to a generic id if necessary.
  print k OFS out > o_file
}

# End of program.
