munge.awk.in

#! @AWK@ -f
#
# -*-awk-*-
#
#     Copyright (C) 1998-2000  Thomas Roessler <roessler@guug.de>
#                   2000-2018  Roland Rosenfeld <roland@spinnaker.de>
#                   2007       Yaroslav Halchenko <debian@onerussian.com>
# 
#     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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,, USA.

function print_line (line, lastdate, count)
{
    if (line == "") return;
    if (limitdate != "" && lastdate < limitdate && count < limitcount) return;
    if (limitcount == 0)
	print line;
    else 
	print line FS count;
}

BEGIN {
    # initialization
    FS = "\t";
    i = 0;

    # default settings
    keeporder = 0;                  # do not keep order by default
    limitdate = "0000-00-00_00:00"; # keep all dates by default
    limitcount = 0;                 # and do not limit by count by default
}

{
    sub(/ +$/, "", $3); # strip trailing spaces (as of former bug)
    line[$1] = ($1 FS $2 FS $3);

    if (lastdate[$1] == "" || lastdate[$1] < $3)
        lastdate[$1] = $3;

    line[$1] = ($1 FS $2 FS lastdate[$1]);

    if ($4 != "")
	cnt[$1] += $4;
    else
        cnt[$1]++;

    if (keeporder == 1)
    {
        pos[$1] = i;
        idx[i++] = $1;
    }
}

END {
    if (keeporder == 1)
       for (j = 0; j < i; j++) {
            if (pos[idx[j]] == j) {
                print_line(line[idx[j]], lastdate[idx[j]], cnt[idx[j]]);
            }
        }
    else
        for (a in line) {
            print_line(line[a], lastdate[a], cnt[a]);
        }
}