use `git describe` to generate version

config.mk

@@ -1,5 +1,5 @@
 _VERSION = 0.3.1
-VERSION  = `./generate-version.sh $(_VERSION)`
+VERSION  = `git describe --long --tags --dirty 2>/dev/null || echo $(_VERSION)`
 
 # paths
 PREFIX = /usr/local

generate-version.sh

@@ -1,13 +0,0 @@
-#!/bin/sh
-
-if git tag --contains HEAD | grep -q $1; then
-	echo $1
-else
-	branch="$(git rev-parse --abbrev-ref HEAD)"
-	commit="$(git rev-parse --short HEAD)"
-	if [ "${branch}" != "main" ]; then
-		echo $1-$branch-$commit
-	else
-		echo $1-$commit
-	fi
-fi