#!/bin/sh

# $1	- version string
# options:
#	-c	colored grep
#	-d	debug
#	-r	release (exit status error; when called from Makefile)

set -eu
#set -x

files="Documentation/user-manual.txt Makefile README ReleaseNotes.txt"

whine() {
	echo "$0: $*" >&2
}

croak() {
	whine "$*"
	exit 1
}

color=n
debug=n
release=n
while getopts cdr opt; do
	case $opt in
		c)
			color=y
			;;
		d)
			debug=y
			;;
		r)
			release=y
			;;
		*)
			croak "invalid option"
			;;
	esac
done
shift $(($OPTIND - 1))

if [ $debug = y ]; then
	opts=-n
else
	opts=-q
fi
[ $color = n ] || opts="${opts:+ }--color"

v=${1:-}
case $v in
	*-*)
		# Ignore development versions
		if [ $release = y ]; then
			croak "'$v' not a release tag"
		else
			exit 0
		fi
		;;
	''|*[!.0-9]*)
		croak "invalid version string '$v'"
		;;
esac

sts=0
whine "checking for version $v"
for f in $files; do
	grep $opts -EHio "(VERSION=|subsurface[[:blank:]]+)?\<v?$v\>" $f || {
		msg="'$f' may need updating"
		if [ $release = y ]; then
			croak "$msg"
		else
			whine "$msg"
		fi
	}
done