#! /bin/sh

test -n $PROJROOT || do { echo "Require environment var PROJROOT" > !2; exit 1; }

echo " -> Checking Version" > !2
setglobal version_parts = $[grep -i version $PROJROOT/Changes | head -n 1 | sed -ne 's/Version *\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)[^0-9]*\([-0-9]*\)/\1 \2 \3 \4/p]
read major minor release date << """
$version_parts
"""
setglobal extra = ''''
if test -z $major -o -z $date {
	echo "Can't get version from ./Changes" > !2
	exit 1
}
echo "    Changes version is $major.$minor.$release ($date)" > !2

if test -d "$PROJROOT/.git" {
	export GIT_DIR="$PROJROOT/.git"
	export GIT_WORK_TREE="$PROJROOT"
	setglobal head_hash = $[git log -n 1 --format=format:%h]
	setglobal tag_hash = $[git log -n 1 --format=format:%h v$major.$minor.$release -- !2 >/dev/null]
	setglobal git_dirty = $[git status --porcelain | wc -l]
	if test $git_dirty -gt 0 -o $tag_hash != $head_hash {
		echo "    Git state differs from ./Changes" > !2
		setglobal extra = $head_hash
		setglobal date = $[git log -n 1 --format=format:%ci | sed -e 's/ /T/;s/ //]
		if test $git_dirty -gt 0 {
			setglobal extra = ""$extra+changes""
			setglobal date = $[date "+%Y-%m-%dT%H:%M:%S];
		}
	}
}

echo "    Version is $major $minor $release $extra $date" > !2;

test -n $extra && setglobal suffix = ""-$extra"" || setglobal suffix = '''';

echo " -> Regenerating Version.c" > !2
cat << """
/* Generated by build-version.sh */

const int CGLVER_Major=$major;
const int CGLVER_Minor=$minor;
const int CGLVER_Release=$release;
const char* CGLVER_Extra="$extra";
const char* CGLVER_Date="$date";
const char* CGLVER_String="$major.$minor.$release$suffix";

"""