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|
package App::cpanlistchanges;
use strict;
use 5.008_001;
our $VERSION = '0.05';
use Algorithm::Diff;
use CPAN::DistnameInfo;
use Getopt::Long;
use IO::Handle;
use Module::Metadata;
use LWP::UserAgent;
use YAML;
use Try::Tiny;
use Pod::Usage;
use version;
sub new {
bless {
all => 0,
use_pager => 1,
}, shift;
}
sub run {
my($self, @args) = @_;
Getopt::Long::GetOptionsFromArray(
\@args,
"all|a", \$self->{all},
"help", sub { Pod::Usage::pod2usage(0) },
"pager!", \$self->{use_pager},
);
for my $mod (@args) {
$self->show_changes($mod);
}
}
sub get {
my $self = shift;
$self->{ua} ||= do{
my $ua = LWP::UserAgent->new(agent => "cpan-listchanges/$VERSION");
$ua->env_proxy;
$ua;
};
$self->{ua}->get(@_)->content;
}
sub show_changes {
my($self, $mod) = @_;
my($from, $to);
if ($mod =~ s/\@\{?(.+)\}?$//) {
($from, $to) = split /\.\./, $1;
$to = undef if $to eq 'HEAD';
}
my $dist = try { YAML::Load( $self->get("http://cpanmetadb.appspot.com/v1.0/package/$mod") ) };
unless ($dist->{distfile}) {
warn "Couldn't find a module '$mod'. Skipping.\n";
return;
}
my $meta = Module::Metadata->new_from_module($mod);
my $info = CPAN::DistnameInfo->new($dist->{distfile});
$from ||= $meta->{version};
$to ||= $info->{version};
unless ($self->{all} or $from) {
warn "You don't have the module '$mod' installed locally. Skipping.\n";
return;
}
unless ($self->{all} or $to) {
warn "Couldn't find the module '$mod' on CPAN MetaDB. Skipping.\n";
return;
}
if (!$self->{all} and version->new($from) >= version->new($to)) {
warn "You have the latest version of $info->{dist} ($to). Skipping.\n";
return;
}
my $get_changes = sub {
my $version = shift;
my $html = $self->get("http://search.cpan.org/dist/$info->{dist}-$version");
$html =~ s/&#(\d+);/chr $1/eg; # search.cpan.org seems to encode all filenames
$html =~ m!<a href="(/src/[^"]+)">(Change.*?)</a>!i or return;
my($url, $filename) = ($1, $2);
return $self->get("http://cpansearch.perl.org$1");
};
my $new_changes = $get_changes->($to);
unless ($new_changes) {
warn "Can't find Changes for $info->{dist}-$to. Skipping.\n";
return;
}
if ($self->{all}) {
$self->print("=== Changes for $info->{dist}\n\n$new_changes\n");
return;
}
my $old_changes = $get_changes->($from) || '';
my $diff = Algorithm::Diff->new(
[ split /\n/, $old_changes ],
[ split /\n/, $new_changes ],
);
$diff->Base(1);
my $result;
while ($diff->Next()) {
next if $diff->Same();
$result .= "$_\n" for $diff->Items(2);
}
if ($result) {
$self->print("=== Changes between $from and $to for $info->{dist}\n\n$result\n");
} else {
warn "Couldn't find changes between $from and $to for $info->{dist}\n";
}
}
sub print {
my $self = shift;
$self->{pager} ||= ($self->{use_pager} and $ENV{PAGER})
? do {
open my $io, "| $ENV{PAGER}" or die $!;
$io;
} : \*STDOUT;
$self->{pager}->print(@_);
}
1;
__END__
=encoding utf-8
=for stopwords
=head1 NAME
App::cpanlistchanges - list changes for CPAN modules
=head1 AUTHOR
Tatsuhiko Miyagawa E<lt>miyagawa@bulknews.netE<gt>
Tokuhiro Matsuno originally wrote the snippet to fetch Changes and
compare with Algorithm::Diff if I remember correctly.
=head1 COPYRIGHT
Copyright 2010- Tatsuhiko Miyagawa
=head1 LICENSE
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=head1 SEE ALSO
L<cpan-listchanges>
=cut
|
