# Extract version number into 4 parts, some of which may be empty:

#

# version: the numeric part of the most recent tag. Will always look like 1.3.

#

# type: if an rc build, "rc", otherwise empty

#

# distance: the distance from the nearest tag, or empty if built from a tag

#

# node: the node|short hg was built from, or empty if built from a tag

gethgversion() {

    if [ -z "${1+x}" ]; then

        python="python3"

    else

        python="$1"

    fi

    export HGRCPATH=

    export HGPLAIN=

    make cleanbutpackages PYTHON=$python

    make local PURE=--pure PYTHON=$python

    HG="$PWD/hg"

    $python "$HG" version > /dev/null || { echo 'abort: hg version failed!'; exit 1 ; }

    hgversion=`LANGUAGE=C $python "$HG" version | sed -ne 's/.*(version \(.*\))$/\1/p'`

    if echo $hgversion | grep + > /dev/null 2>&1 ; then

        tmp=`echo $hgversion | cut -d+ -f 2`

        hgversion=`echo $hgversion | cut -d+ -f 1`

        distance=`echo $tmp | cut -d- -f 1`

        node=`echo $tmp | cut -d- -f 2`

    else

        distance=''

        node=''

    fi

    if echo $hgversion | grep -E -- '[0-9]\.[0-9](\.[0-9])?rc' > /dev/null 2>&1; then

        version=`echo $hgversion | cut -d'r' -f1`

        type="rc`echo $hgversion | cut -d'c' -f2-`"

    else

        version=$hgversion

        type=''

    fi

}