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#!/usr/bin/mawk -We
# *********************************************************************
# Written by and copyright Carlo Strozzi <carlos@linux.it>.
#
# union: concatenate multiple NoSQL tables and print them to stdout in
# the form of one larger table. The input tables must all have the
# same No. of columns, i.e. they must be ``union compatible''.
# Copyright (C) 2001 Carlo Strozzi <carlos@linux.it>
#
# 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.
#
# 2001-01-15 Initial release
# 2001-04-18 Added inline help
#
# $Id$
# *********************************************************************
BEGIN {
NULL = ""; FS = OFS = "\t"; nr = 1
while (ARGV[++i] != NULL) {
if (ARGV[i] == "-N" || ARGV[i] == "--no-header") no_hdr = 1
else if (ARGV[i] == "-a" || ARGV[i] == "--xargs") h_table = ARGV[++i]
else if (ARGV[i] == "-h" || ARGV[i] == "--help") {
system("grep -v '^#' @DOCPATH@/union.txt")
rc = 1
exit(rc)
}
else argv[++j] = ARGV[i]
}
# Move argv[] back onto ARGV[].
while (++k <= j) { ARGV[k] = argv[k] }
ARGC = k # Set the new arg count.
}
#
# Main loop
#
NR == 1 {old_filename = FILENAME}
NR < 3 {
if (no_hdr) next
if (h_table != NULL && FILENAME != h_table) next
}
FILENAME == old_filename {
if (++nr > 1) print
next
}
{nr = 0; old_filename = FILENAME}
#
# End of program.
#
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