#!/bin/mksh
# $MirOS: contrib/hosted/tg/verscmp,v 1.2 2014/06/20 22:50:56 tg Exp $
#-
# Copyright © 2013, 2014
#	Thorsten Glaser <tg@mirbsd.org>
#
# Provided that these terms and disclaimer and all copyright notices
# are retained or reproduced in an accompanying document, permission
# is granted to deal in this work without restriction, including un‐
# limited rights to use, publicly perform, distribute, sell, modify,
# merge, give away, or sublicence.
#
# This work is provided “AS IS” and WITHOUT WARRANTY of any kind, to
# the utmost extent permitted by applicable law, neither express nor
# implied; without malicious intent or gross negligence. In no event
# may a licensor, author or contributor be held liable for indirect,
# direct, other damage, loss, or other issues arising in any way out
# of dealing in the work, even if advised of the possibility of such
# damage or existence of a defect, except proven that it results out
# of said person’s immediate fault when using the work as intended.
#-
# Compare versions. Syntax: verscmp filea fileb
# Files contain IFS-separated: name, version, ignored

fa=$1; fb=$2
[[ -n $fa && -s $fa && -n $fb && -s $fb ]] || exit 1

py='# coding: utf-8'
nl=$'\n'

function str2python {
	[[ -o utf8-mode ]]; local u=$?
	set +U

	local s="$*" t=\"
	local -i i=0 n=${#s}
	local -Uui16 -Z5 hv

	while (( i < n )); do
		hv=1#${s:(i++):1}
		t+=\\x${hv#16#}
	done
	t+=\"
	print -nr -- "$t"

	(( u )) || set -U
}

function pyadd {
	local field=$1 file=$2 cola colb rest

	py+=$nl"$field = {"
	while read cola colb rest; do
		py+=$nl"$(str2python "$cola"): $(str2python "$colb"),"
	done <"$file"
	py+=$nl"}"
}

pyadd sidea "$fa"
pyadd sideb "$fb"

py+=$nl"q = '\"'"
py+='
comb = {}
ckeys = sidea.keys()
ckeys.extend(sideb.keys())
ckeys = set(ckeys)
for k in ckeys:
	comb[k] = [None, None]
for k, v in sidea.iteritems():
	comb[k][0] = v
for k, v in sideb.iteritems():
	comb[k][1] = v
ckeys = list(ckeys)
ckeys.sort()
for k in ckeys:
	va = comb[k][0]
	vb = comb[k][1]
	if va <> vb:
		if va is None:
			da = "None"
		else:
			da = q + va + q
		if vb is None:
			db = "None"
		else:
			db = q + vb + q
		print k, da, db
'
python <<<"$py"