#!/bin/sh
# This file is a part of Julia. License is MIT: https://julialang.org/license

# Needs to be run from a julia repo clone
# First argument (optional) is a ref to the commit

setglobal gitref = $(1:-HEAD)

setglobal ver = $[git show "$gitref:VERSION]
setglobal major = $[echo $ver | cut -f 1 -d .]
setglobal minor = $[echo $ver | cut -f 2 -d .]

if test $major = 0 -a $minor -lt 5 {
    # use tag based build number prior to 0.5.0-
    setglobal last_tag = $[git describe --tags --abbrev=0 $gitref]
    setglobal nb = $[git rev-list --count $gitref "^$last_tag]
    if test $nb = 0 {
        echo $ver
    } else {
        echo "$ver+$nb"
    }
} else {
    setglobal topdir = $[git rev-parse --show-toplevel]
    setglobal verchanged = $[git blame -L ,1 -sl $gitref -- "$topdir/VERSION" | cut -f 1 -d " ]
    setglobal nb = $[git rev-list --count $gitref "^$verchanged]
    setglobal pre = $[echo $ver | cut -s -f 2 -d "-]
    if test $ver = "0.5.0-dev" {
        # bump to 0.5.0-dev was one commit after tag during 0.5.0-dev
        setglobal nb = $[expr $nb + 1]
    } elif test $ver = "0.5.0-pre" {
        # bump to 0.5.0-pre was 5578 commits after tag
        setglobal nb = $[expr $nb + 5578]
    }
    if test -n $pre {
        if test $major = 0 -a $minor -le 5 {
            echo "$ver+$nb"
        } else {
            echo "$ver.$nb"
        }
    } else {
        echo $ver
    }
}