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#!/usr/bin/perl -w
#
# Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
use strict;
use warnings;
use Getopt::Long;
# List of licences we can handle
my $known_licences = {
gpl_any => {
desc => "GPL (any version)",
can_subsume => {
public_domain => 1,
bsd3 => 1,
bsd2 => 1,
},
},
gpl2_or_later => {
desc => "GPL version 2 (or, at your option, any later version)",
can_subsume => {
gpl_any => 1,
public_domain => 1,
bsd3 => 1,
bsd2 => 1,
},
},
gpl2_only => {
desc => "GPL version 2 only",
can_subsume => {
gpl_any => 1,
gpl2_or_later => 1,
public_domain => 1,
bsd3 => 1,
bsd2 => 1,
},
},
public_domain => {
desc => "Public Domain",
can_subsume => {},
},
bsd4 => {
desc => "BSD Licence (with advertising clause)",
can_subsume => {
public_domain => 1,
bsd3 => 1,
bsd2 => 1,
},
},
bsd3 => {
desc => "BSD Licence (without advertising clause)",
can_subsume => {
public_domain => 1,
bsd2 => 1,
},
},
bsd2 => {
desc => "BSD Licence (without advertising or endorsement clauses)",
can_subsume => {
public_domain => 1,
},
},
};
# Parse command-line options
my $verbosity = 1;
Getopt::Long::Configure ( 'bundling', 'auto_abbrev' );
GetOptions (
'verbose|v+' => sub { $verbosity++; },
'quiet|q+' => sub { $verbosity--; },
) or die "Could not parse command-line options\n";
# Parse licence list from command line
my $licences = {};
foreach my $licence ( @ARGV ) {
die "Unknown licence \"$licence\"\n"
unless exists $known_licences->{$licence};
$licences->{$licence} = $known_licences->{$licence};
}
die "No licences specified\n" unless %$licences;
# Dump licence list
if ( $verbosity >= 1 ) {
print "The following licences appear within this file:\n";
foreach my $licence ( keys %$licences ) {
print " ".$licences->{$licence}->{desc}."\n"
}
}
# Apply licence compatibilities to reduce to a single resulting licence
foreach my $licence ( keys %$licences ) {
# Skip already-deleted licences
next unless exists $licences->{$licence};
# Subsume any subsumable licences
foreach my $can_subsume ( keys %{$licences->{$licence}->{can_subsume}} ) {
if ( exists $licences->{$can_subsume} ) {
print $licences->{$licence}->{desc}." subsumes ".
$licences->{$can_subsume}->{desc}."\n"
if $verbosity >= 1;
delete $licences->{$can_subsume};
}
}
}
# Print resulting licence
die "Cannot reduce to a single resulting licence!\n"
if ( keys %$licences ) != 1;
( my $licence ) = keys %$licences;
print "The overall licence for this file is:\n " if $verbosity >= 1;
print $licences->{$licence}->{desc}."\n";
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