#!/bin/sh

HG=hg

# Switch to directory where this script lives so that further commands are run
# from the root directory of the source.  The script path and srcdir are double
# quoted to allow the space character to appear in the path.
srcdir=`dirname "$0"` && cd "$srcdir" || exit 1

# Ensure that we have a repo here and that mercurial is installed.  If
# not, just cat the VERSION file; it contains the latest release number.
{ [ -d ".hg" ] && $HG >/dev/null 2>&1; } \
|| exec cat VERSION

# This is a mercurial repo and we have the hg command.

# Get essential properties of the current working copy
set -- `$HG parents --template='{rev} {node|short}\n'`
rev="$1"
node="$2"

# translate release tags into ##.##.## notation
cleantag () {
	case "$1" in
		mutt-*-rel) echo "$1" | sed -e 's/mutt-//' -e 's/-rel//' | tr - . ;;
		*)          echo "$1" ;;
	esac
}

getdistance_old () {
	# fudge it
	set -- `$HG tags | sort -n -k 2 | egrep 'mutt-.*rel' | tail -1 | cut -d: -f1`
	latesttag="$1"
	latestrev="$2"
	distance=`expr $rev - $latestrev`
	echo $latesttag $distance
}

getdistance_new () {
	$HG parents --template='{latesttag} {latesttagdistance}\n'
}


# latesttag appeared in hg 1.4.  Test for it.
[ "`$HG log -r . --template='{latesttag}'`" = '' ] && 
set -- `getdistance_old` ||
set -- `getdistance_new`

tag=`cleantag "$1"`
dist=$2

if [ $dist -eq 0 ]; then
	dist=
else
	dist="+$dist"
fi

# if we have mq patches applied, mention it
qparent=`$HG log -r qparent --template='{rev}\n' 2>/dev/null || echo $rev`
qdelta=`expr $rev - $qparent`
if [ $qdelta -eq 0 ]; then
	qdist=""
else
	qdist=",mq+$qdelta"
fi

echo "$tag$dist$qdist ($node)"
exit 0