get_version

#!/bin/sh -e
# called by meson to get project version

main() {
    if [ "$1" = "--save" ]; then
        get_git_version > "${MESON_DIST_ROOT:?}/VERSION"
    elif [ -e VERSION ]; then
        cat VERSION
    else
        get_git_version
    fi
}

get_git_version() {
    version="$(git_describe)"
    version="${version#v}" # remove "v" prefix

    case "$version" in
    *-*)
        # not an exact match: make version PEP 440 compliant
        # e.g. 1.2.3-5-gd63c80c is turned into 1.2.3.dev5+gd63c80c
        latest_release="${version%%-*}"
        suffix="${version#*-}"
        dev_num="${suffix%%-*}"
        commit="${suffix#*-}"
        echo "$latest_release.dev$dev_num+$commit"
        ;;
    *)
        echo "$version"
    esac
}

git_describe() {
    if ! git -C "${MESON_SOURCE_ROOT:-$PWD}" describe --match "v*" --tags 2>/dev/null; then
        echo "v0.1.0-0-g$(git rev-parse --short HEAD)"
    fi
}

main "$@"