evalrev

#!/bin/sh

set -euf

DIR=${1:-}
CMD=${2:-}

SCM=""

if [ x$DIR = "x" ]
then
	DIR="."
fi

if test -d "${DIR}/.git"; then
    #
    # Locate the closest annotated tag
    #
    REVISION="$(git describe --abbrev=0 --tags 2>/dev/null || echo unknown)"

    #
    # Determine if we are a development branch, if so then append the
    # short SHA1.
    #
    EXACTLY="$(git describe --abbrev=0 --tags --exact-match 2>/dev/null || echo)"

    if test -z "$EXACTLY"; then
        REVISION="${REVISION}_rev-$(git rev-parse --verify --short HEAD)"
        SCM="_rev-$(git rev-parse --verify --short HEAD)"
    fi
elif test -d "${DIR}/.svn"; then
    REVISION="_r$(svnversion $DIR 2> /dev/null | sed 's/[^0-9]*//g')"
    SCM="_r$(svnversion $DIR 2> /dev/null | sed 's/[^0-9]*//g')"

    if test x$REVISION = "x"; then
        REVISION="_r$(svn info $DIR 2> /dev/null | grep -i revision | sed 's/[^0-9]*//g')"
        SCM="_r$(svn info $DIR 2> /dev/null | grep -i revision | sed 's/[^0-9]*//g')"
    fi

    if test x$REVISION = "x"; then
        if test -f "${DIR}/.svn/entries"; then
            REVISION="_r$(cat ${DIR}/.svn/entries | grep -i revision | head -n 1 | sed 's/[^0-9]*//g')"
            SCM="_r$(cat ${DIR}/.svn/entries | grep -i revision | head -n 1 | sed 's/[^0-9]*//g')"
        fi
    fi

    if test x$REVISION = "x"; then
        REVISION="_r1"
        SCM="_r1"
    fi
else
    REVISION="$(cat ${DIR}/VERSION)"
fi

if test "x$CMD" = "xscm"; then
    echo $SCM
elif test "x$CMD" = "xquoted"; then
    echo \"$REVISION\"
else
    echo $REVISION
fi