#!/bin/sh

#

# This is an example of using HGEDITOR to create of diff to review the

# changes while commiting.

# 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

}

(

    grep '^HG: changed' "$1" | cut -b 13- | while read changed; do

        hg diff "$changed" >> "$HGTMP/diff"

    done

)

cat "$1" > "$HGTMP/msg"

MD5=$(which md5sum 2>/dev/null) || \

    MD5=$(which md5 2>/dev/null) 

[ -x "${MD5}" ] && CHECKSUM=`${MD5} "$HGTMP/msg"`

if [ -s "$HGTMP/diff" ]; then

    $EDITOR "$HGTMP/msg" "$HGTMP/diff" || exit $?

else

    $EDITOR "$HGTMP/msg" || exit $?

fi

[ -x "${MD5}" ] && (echo "$CHECKSUM" | ${MD5} -c >/dev/null 2>&1 && exit 13)

mv "$HGTMP/msg" "$1"

exit $?