#!/bin/sh
#
# change the >Responsible: of all non-closed reports.
# Author: Hans-Albert.Schneider@mchp.siemens.de
# Copyright (C) Infineon Technologies AG, 2002
#

usage="usage: $0 -d gnats_root old_responsible new_responsible reason"

# Check usage
if [ $# -lt 5 ]
then
    echo $usage >&2
    exit 1
fi

if [ "x$1" = "x-d" ]
then
    if [ "x$2" = "x" ]
    then
	echo $usage >&2
	exit 1
    else
	gnatsroot="$2"
    fi
else
    echo $usage >&2
    exit 1
fi

if [ "x$3" = "x" -o  "x$4" = "x"  -o  "x$5" = "x" ]
then
    echo $usage >&2
    exit 1
fi

oldresp="$3"
newresp="$4"
reason="$5"


if [ ! -f "$gnatsroot/gnats-adm/index" ]
then
    echo $usage >&2
    echo "Cannot find index file $gnatsroot/gnats-adm/index" >&2
    exit 1
fi


resp_file=$gnatsroot/gnats-adm/responsible

if grep "^${oldresp}:" "$resp_file"
then
    : OK
else
    echo "Warning: '${oldresp}' not listed in $resp_file" >&2
    # No exit here; we are going to replace her/him anyway.
fi

if grep "^${newresp}:" "$resp_file"
then
    : OK
else
    echo $usage >&2
    echo "Warning: New responsible '${newresp}' not listed in $resp_file" >&2
    exit 1
fi


pr_list=`awk '-F|' '$3 == resp && $4 != "closed" {print $1}' resp="${oldresp}" $gnatsroot/gnats-adm/index`

if [ "x$pr_list" = "x" ]
then
    echo "No reports for '${oldresp}' found."
    exit 0
fi


echo "Responsible" | grep -i "${oldresp}" >/dev/null
if [ $? -eq 0 ]
then
    echo "Sorry, but the name of the new responsible, '${newresp}'," >&2
    echo "is a substring of the word 'Responsible'." >&2
    echo "This script cannot deal with that case; it would mess up" >&2
    echo "your reports." >&2
    echo "Please do the assignment manually." >&2
    exit 2
fi

#
# End of usage checking
#

# Create a temporary file to be used as the EDITOR environment variable.
# Make sure it belongs to us, and nobody else can modify it.
#
tmp=${TMPDIR:-/tmp}/chresp$$
[ -f "$tmp" ] && rm -f "$tmp"
[ -f "$tmp" ] && echo "Cannot rm $tmp" >&2 && exit 2
touch "$tmp" || echo "Cannot create $tmp" >&2
[ -f "$tmp" ] || exit 2
chmod 700 "$tmp"

cat >"$tmp" <<EOF
#!/bin/sh
# change responsible of GNATS problem report
EOF
echo "(echo '/>Responsible:/ s/${oldresp}/${newresp}/'; echo w) | ed "'$1' >> "$tmp"

EDITOR="$tmp"
export EDITOR
unset VISUAL


for id in $pr_list
do
    echo "Changing PR# $id ..."
    echo "$reason" | edit-pr -d "$gnatsroot" $id
done

rm -f "$tmp"