#! /bin/sh
# -*- mode: shell-script -*-
#
# updatechangelog 1.2
#
# Copyright (C) 2003 Elmar Hoffmann <elho@elho.net>
#
# Automatically generate ChangeLog on CVS commit using cvs2cl.
#
# You need to have RCS from http://www.gnu.org/software/rcs/
# and cvs2cl from http://www.red-bean.com/cvs2cl/ installed
# in the PATH used below.
#
# Assuming foobar being your projects top-level dir below $CVSROOT,
# ie. you want to create $CVSROOT/foobar/ChangeLog on commit and
# you installed this script to /usr/local/bin/, add the following
# line to $CVSROOT/CVSROOT/loginfo:
# ^foobar /usr/local/bin/updatechangelog %s
#
# If you however commited this script into $CVSROOT/CVSROOT/, use the
# following line instead:
# ^foobar $CVSROOT/CVSROOT/updatechangelog %s
# Do not forget to add it to $CVSROOT/CVSROOT/checkoutlist in this case!
#
# Download latest version at http://www.elho.net/dev/updatechangelog
#
#
# 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

CVS2CLFLAGS="--separate-header --no-wrap --utc --usermap $CVSROOT/CVSROOT/users"

export PATH='/usr/sbin:/usr/bin:/sbin:/bin'

test "x$1" = "x" && exit 0

# avoid recursion
expr "$1" : '[^ ]* ChangeLog' >/dev/null && exit 0

# get top-level directory and relative path to get there
fulldir=`expr substr "$1" 1 \( index "$1" " " - 1 \)`

index=`expr index "$fulldir" "/"`
if [ $index -gt 0 ]; then
    reldir=".."
    dir=`dirname "$fulldir"`
    while expr index "$dir" "/" >/dev/null; do
        reldir="$reldir/.."
        dir=`dirname $dir`
    done
else
    dir="$fulldir"
    reldir="."
fi

# run in background to avoid deadlock
(
    cd "$reldir"
    test -f ChangeLog && rm -f ChangeLog && touch ChangeLog >/dev/null 1>&2
    cvs update ChangeLog >/dev/null
    (
        cd "$CVSROOT/$dir"
        find -name '*,v' -print | sed 's#^\./\(.*\),v$#\1#' | \
            xargs --no-run-if-empty rlog
    ) | \
        cvs2cl --stdin --ignore ChangeLog $CVS2CLFLAGS >/dev/null
    rm -f ChangeLog.bak >/dev/null 1>&2
    cvs commit -m 'automatic ChangeLog regeneration' ChangeLog >/dev/null
) &