#!/bin/bash
# vim ft:sh

function git_tag {
    git describe --tags --abbrev=0 2>/dev/null | head -n 1
}

function git_version {
    tag="$(git_tag)"
    tag_version="$(echo "$tag" | sed -E -n "s/^v?([^-]+)/\1/p")"
    if [ -z "$tag_version" ]; then
        tag_version=0
    fi
    output "$tag_version"
}

function git_release {
    latest_tag="$(git_tag)"
    if [ -n "$latest_tag" ]; then
        commit_count="$(git rev-list "$latest_tag"..HEAD --count 2>/dev/null)"
        commit_count=$(( commit_count + 1 ))
    else
        commit_count="$(git rev-list HEAD --count 2>/dev/null || printf 0)"
    fi
    if [ -n "$latest_tag"  ] && [ "$commit_count" -eq 1 ]; then
        output "0.1"
    else
        snap_date="$(date +%+4Y%m%d)"
        shortcommit="$(git rev-parse --short HEAD)"
        output "0.$commit_count.${snap_date}git${shortcommit}"
    fi
}

function git_dir_release {
    git_release "$@"
}