#!/bin/sh

#

# This is an example of using HGEDITOR to automate the signing of

# commits and so on.

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`

    # Add manifest hash in order to sign whole repository state.

    # Remove HG: prefix, as we want that to be stored.

    grep '^HG: manifest hash' "$1" | cut -b 5- >> "$T1"

    # Add all other state information

    grep -v '^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 $?

    echo "$CHECKSUM" | md5sum -c --status && cleanup_exit 13

    {

        head -n 1 "$T1"

        echo

        grep -v "^HG:" "$T1" | gpg -t -a -u "${HGUSER}" --clearsign

    } > "$T2" && mv "$T2" "$1"

    cleanup_exit $?

fi