#!/bin/sh
#
# This is an example of using HGEDITOR to automate the signing of
# commits and so on.

# change this to one to turn on GPG support
SIGN=0

# If you want to pass your favourite editor some other parameters
# only for Mercurial, modify this:
case "${EDITOR}" in
    "")
        EDITOR="vi"
        ;;
    emacs)
        EDITOR="$EDITOR -nw"
        ;;
    gvim|vim)
        EDITOR="$EDITOR -f -o"
        ;;
esac


HGTMP=""
cleanup_exit() {
    rm -rf "$HGTMP"
}

# Remove temporary files even if we get interrupted
trap "cleanup_exit" 0 # normal exit
trap "exit 255" 1 2 3 6 15 # HUP INT QUIT ABRT TERM

HGTMP="${TMPDIR-/tmp}/hgeditor.$RANDOM.$RANDOM.$RANDOM.$$"
(umask 077 && mkdir "$HGTMP") || {
    echo "Could not create temporary directory! Exiting." 1>&2
    exit 1
}

(
    cd "`hg root`"
    grep '^HG: changed' "$1" | cut -b 13- | while read changed; do
        hg diff "$changed" >> "$HGTMP/diff"
    done
)

echo > "$HGTMP/msg"
if [ "$SIGN" == "1" ]; then
    MANIFEST=`grep '^HG: manifest hash' "$1" | cut -b 19-`
    echo -e "\nmanifest hash: $MANIFEST" >> "$HGTMP/msg"
fi
grep -vE '^(HG: manifest hash .*)?$' "$1" >> "$HGTMP/msg"

CHECKSUM=`md5sum "$HGTMP/msg"`
if [ -s "$HGTMP/diff" ]; then
    $EDITOR "$HGTMP/msg" "$HGTMP/diff" || exit $?
else
    $EDITOR "$HGTMP/msg" || exit $?
fi
echo "$CHECKSUM" | md5sum -c >/dev/null 2>&1 && exit 13

if [ "$SIGN" == "1" ]; then
    {
        head -n 1 "$HGTMP/msg"
        echo
        grep -v "^HG:" "$HGTMP/msg" | gpg -t -a -u "${HGUSER}" --clearsign
    } > "$HGTMP/msg.gpg" && mv "$HGTMP/msg.gpg" "$1"
else
    mv "$HGTMP/msg" "$1"
fi

exit $?