#!/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

T1=""; T2=""
cleanup_exit() {
    rm -f "$T1" "$T2"
    exit $1
}

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

if grep -q "^HG: merge resolve" "$1" ; then
    # we don't sign merges
    exec $EDITOR "$1"
else
    # Remove temporary files even if we get interrupted
    trap "cleanup_exit 255" TERM KILL INT QUIT ABRT
    T1=`mktemp`; T2=`mktemp`
    MANIFEST=`grep '^HG: manifest hash' "$1" | cut -b 19-`

    echo -e "\n\nmanifest hash: $MANIFEST" >> "$T1"
    grep -vE '^(HG: manifest hash .*)?$' "$1" >> "$T1"
    (
        cd "`hg root`"
        grep '^HG: changed' "$1" | cut -b 13- | while read changed; do
            hg diff "$changed" >> "$T2"
        done
    )

    CHECKSUM=`md5sum "$T1"`
    $EDITOR "$T1" "$T2" || cleanup_exit $?

    if [ "$SIGN" == "1" ] ; then
	echo "$CHECKSUM" | md5sum -c 2>/dev/null && cleanup_exit 13
	{
	    head -n 1 "$T1"
	    echo
	    grep -v "^HG:" "$T1" | gpg -t -a -u "${HGUSER}" --clearsign
	} > "$T2" && mv "$T2" "$1"
    else
	mv "$T1" "$1"
    fi
    cleanup_exit $?
fi