#!/usr/bin/env runawk

# Copyright (c) 2007-2008 Aleksey Cheusov <vle@gmx.net>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

############################################################

#use "pkgsrc-dewey.awk"

############################################################
function usage (){
	printf "\
pkg_cmp_summary - compares two summary files\n\
usage: pkg_cmp_summary -h\n\
       pkg_cmp_summary [OPTIONS] summary1 summary2\n\
OPTIONS:\n\
  -h|--help            display this help\n\
  -p|--with-pkgpath    use PKGPATH:PKGBASE pair for identifing a package\n\
  -c|--use-checksum    also use CVS_CHECKSUM field in comparing packages\n\
" > "/dev/stderr"
}

BEGIN {
	skip = 0
	for (i = 1; i <= ARGC; ++i){
		if (ARGV [i] ~ /^(-h|--help)$/){
			usage()
			exit 0
		}else if (ARGV [i] ~ /^(-p|--with-pkgpath)$/){
			with_pkgpath = 1
			ARGV [i] = ""

			++skip
		}else if (ARGV [i] ~ /^(-c|--use-checksum)$/){
			use_checksum = 1
			ARGV [i] = ""

			++skip
		}
	}

	if (ARGC-skip != 3){
		usage()
		exit 1
	}

	file1 = ARGV [1 + skip]
}

function trim (s){
	sub(/^[ \t]+/, "", s)
	sub(/[ \t]+$/, "", s)

	return s
}

$0 ~ /^PKGNAME=/ {
	pkgname = trim(substr($0, 9))
	next
}

use_checksum && $0 ~ /^CVS_CHECKSUM=/ {
	checksum = trim(substr($0, 14))
	next
}

with_pkgpath && $0 ~ /^PKGPATH=/ {
	pkgpath = trim(substr($0, 9))
	next
}

NF == 0 {
	# option PKGPATH
	if (with_pkgpath){
		pkgname = pkgpath " " pkgname
	}

	# ver
	ver = pkgname
	sub(/^.*-/, "", ver)

	# pkgbase
	pkgbase = pkgname
	sub(/-[^-]+$/, "", pkgbase)

	# current checksum
	curr_checksum = checksum

	# cleaning...
	pkgname = pkgpath = checksum = ""

	#
	if (FILENAME == file1){
		# first file!
		if (pkgbase in names){
			duplicates [pkgbase] += 1
		}else{
			names [pkgbase] = ver

			if (use_checksum){
				checksums [pkgbase] = curr_checksum
			}
		}
	}else{
		# second file!
		present [pkgbase] = 0

		if (pkgbase in duplicates){
			next
		}

		if (! (pkgbase in names)){
			print "+", pkgbase, ver
			next
		}

		ver1 = names [pkgbase]
		res = dewey_cmp(ver1, ver)

		if (use_checksum && res == "="){
			prev_checksum = checksums [pkgbase]
			if (prev_checksum != "" &&
				curr_checksum != "" &&
				prev_checksum != curr_checksum)
			{
				res = "!"
			}
		}

		print res, pkgbase, ver1, ver
	}

	next
}

END {
	for (pkgbase in names){
		if (! (pkgbase in present)){
			print "-", pkgbase, names [pkgbase]
			delete duplicates [pkgbase]
		}else if (pkgbase in duplicates){
			print duplicates [pkgbase]+1, pkgbase
		}
	}
}