#!/bin/bash
# need a Posix shell, so we simply use bash

set -e

uid=`id -u`
date=`date`
name=$(awk -F: "\$3==$uid { print \$5 }" /etc/passwd )
addr="<`id -un`@`hostname -d`>"

for i in `find . -name Changes -print`; do
    dir=`dirname $i`
    if [ -s $dir/Changes ]; then
	awk '
	state == 0 && /^[ \t]*$/  { next }
	state == 0  { state = 1 }
	/^[ \t]*$/ { empty++; next }
		   { while ( empty > 0 ) { print ""; empty--; }; print  }
	' < $dir/Changes > $dir/Changes.tmp
	if [ -s $dir/Changes.tmp ]; then
	    lines=`wc -l <$dir/Changes.tmp`
	    echo "$date  $name  $addr" >$dir/ChangeLog.new
	    echo >>$dir/ChangeLog.new
	    cat $dir/Changes.tmp   >>$dir/ChangeLog.new
	    echo >>$dir/ChangeLog.new
	    [ -f $dir/ChangeLog ] && cat $dir/ChangeLog >>$dir/ChangeLog.new
	    echo -n > $dir/Changes
	    [ -f $dir/ChangeLog ] && rm $dir/ChangeLog
	    mv $dir/ChangeLog.new $dir/ChangeLog
	    echo "$lines new lines in $dir/ChangeLog"
	fi
	rm $dir/Changes.tmp || true
    fi
done

# Execute canned cvs remove commands
for i in `find . -name cvs-remove -print`; do
    dir=`dirname $i`
    if [ -s $dir/cvs-remove ]; then
	here=`pwd`
	cd $dir
	if cvs remove -f `cat cvs-remove`; then
	    rm cvs-remove
	fi
	cd $here
    fi
done

# Execute canned cvs add commands
for i in `find . -name cvs-add -print`; do
    dir=`dirname $i`
    if [ -s $dir/cvs-add ]; then
	here=`pwd`
	cd $dir
	if cvs add `cat cvs-add`; then
	    rm cvs-add
	fi
	cd $here
    fi
done

cvs -z3 commit -m "See ChangeLog: $date  $name" $*