#!/bin/sh

git --version >/dev/null || exit

curr_dir=$(pwd)

src_top_dir=
[ -d ${curr_dir}/.git ] && {
    src_top_dir=${curr_dir}
} || {
    curr_dir=$(dirname ${curr_dir})
    [ -d ${curr_dir}/.git ] && {
        src_top_dir=${curr_dir}
    } || {
        [ -z "$1" ] && exit
        src_top_dir=$1
    }
}
[ -z "${src_top_dir}" ] && exit


VERSION_FILE=${src_top_dir}/version.h

git_head=$(git --git-dir "${src_top_dir}" rev-parse --verify HEAD 2>/dev/null)
[ -z "${git_head}" ] && exit

new_version="$(git --git-dir "${src_top_dir}" describe 2>/dev/null)"
[ -z "${new_version}" ] && exit


saved_version=
[ -r  ${VERSION_FILE} ] && {
    saved_version=$(grep '^#define MC_CURRENT_VERSION' ${VERSION_FILE}| sed -r 's/.*"(.*)"$/\1/')
}

[ -z "${saved_version}" -o "${saved_version}" != "${new_version}" ] && {
    cat >${VERSION_FILE} <<EOF
#ifndef MC_CURRENT_VERSION
/* This is autogenerated file. Don't edit! */
#define MC_CURRENT_VERSION "${new_version}"
#endif
EOF
}
exit 0