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package WWW::Comix; |
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use version; our $VERSION = qv('0.1.1'); |
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use warnings; |
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use strict; |
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use Carp; |
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use English qw( -no_match_vars ); |
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=for comment |
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There is some blur about what "plugin" means here, because you can |
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refer to a plugin either by name (and this is what you see from the |
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outside) or by package (most operations rely on this in this module). |
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To help distinguish the two cases, all package-oriented functions |
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are prepended with an underscore, just to mark that these functions |
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should remain private here. Caveat emptor. |
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=cut |
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use Module::Pluggable require => 1, sub_name => '_unsorted_plugins'; |
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sub new { |
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my $package = shift; |
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my %args = @_; |
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croak "no comic specified\n" |
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unless exists $args{comic} && defined($args{comic}); |
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if (exists $args{plugin}) { |
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my $plugin = _plugin_from_name($args{plugin}); |
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return $plugin->new(@_); |
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} |
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for my $plugin (_sorted_plugins()) { |
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my $agent = eval { $plugin->new(@_); }; |
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carp $EVAL_ERROR if $EVAL_ERROR; |
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next unless $agent && $agent->is_ok(); |
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return $agent; |
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} ## end for my $plugin (_sorted_plugins... |
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croak "comic $args{comic} not available"; |
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} ## end sub new |
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sub get_plugins { |
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my @plugins = map { $_->get_name() } _unsorted_plugins(); |
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return @plugins if wantarray; |
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return \@plugins; |
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} |
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sub get_plugins_capabilities { |
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my $package = shift; |
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my %args = @_; |
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54
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my %comic_for; |
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for my $plugin (_unsorted_plugins()) { |
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eval { |
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$comic_for{$plugin->get_name()} = |
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[sort $plugin->get_comics_list(@_)]; |
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} or carp $EVAL_ERROR; |
60
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} ## end for my $plugin (_unsorted_plugins... |
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62
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return %comic_for if wantarray; |
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return \%comic_for; |
64
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} ## end sub get_plugins_capabilities |
65
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66
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sub get_comics_list { |
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1
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my $package = shift; |
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69
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my %plugin_for; |
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for my $plugin (_sorted_plugins()) { |
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eval { |
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my $plugin_name = $plugin->get_name(); |
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for my $comic ($plugin->get_comics_list(@_)) { |
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push @{$plugin_for{$comic}}, $plugin_name; |
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75
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} |
76
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0
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1; |
77
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} |
78
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or carp $EVAL_ERROR; |
79
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} ## end for my $plugin (_sorted_plugins... |
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81
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0
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return %plugin_for if wantarray; |
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return \%plugin_for; |
83
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} ## end sub get_comics_list |
84
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85
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sub probe { |
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1
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$_[0]->get_plugins_capabilities(probe => 'ok'); |
87
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} |
88
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89
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sub _plugin_from_name { |
90
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my $pack = shift; |
91
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my $name = shift || $pack; |
92
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for (_unsorted_plugins()) { |
93
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return $_ if $name eq $_->get_name(); |
94
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} |
95
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croak "no plugin for '$name'"; |
96
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} ## end sub _plugin_from_name |
97
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98
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sub _get_plugins_priorities { # package-wise |
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map { $_ => $_->get_priority() } _unsorted_plugins(); |
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100
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} |
101
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102
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sub get_plugins_priorities { # name-wise |
103
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0
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1
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my %priority_for = _get_plugins_priorities(); |
104
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0
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map { $_->get_name() => $priority_for{$_} } keys %priority_for; |
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105
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} |
106
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107
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sub _sorted_plugins { |
108
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0
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0
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my %priority_for = _get_plugins_priorities(); |
109
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return |
110
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0
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sort { $priority_for{$a} <=> $priority_for{$b} } _unsorted_plugins(); |
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0
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111
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} |
112
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113
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1; # Magic true value required at end of module |
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__END__ |
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116
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=head1 NAME |
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118
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WWW::Comix - programmatically access comics on the web |
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120
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=head1 VERSION |
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122
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This document describes WWW::Comix version 0.1.1. Most likely, this |
123
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version number here is outdate, and you should peek the source. |
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125
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126
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=head1 SYNOPSIS |
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128
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use WWW::Comix; |
129
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130
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# List of available plugins |
131
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my @available_plugins = WWW::Comix->get_plugins(); |
132
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133
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# List of plugins and their comics |
134
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my %comics_for = WWW::Comix->get_plugins_list(probe => 'ok'); |
135
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while (my ($name, $comics) = each %comics_for) { |
136
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print {*STDOUT} "$plugin\n"; |
137
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print {*STDOUT} " $_\n" for @$comics; |
138
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} |
139
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140
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# List comics by plugins that provide them, in order of priority |
141
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my %plugins_for = WWW::Comix->get_comics_list(probe => 'ok'); |
142
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while (my ($comic, $plugin) = each %plugin_for) { |
143
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print {*STDOUT} $comic, ': '; |
144
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print {*STDOUT} join ', ', @$plugin; |
145
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} |
146
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147
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# So what's the priority of each plugin? |
148
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my %priority_for = WWW::Comix->get_plugins_priorities(); |
149
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150
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# Ok, I have a $feature I'm interested into... |
151
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WWW::Comix->probe(); |
152
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my $comix = WWW::Comix->new(comic => $feature); |
153
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my $iterator = $comix->get_id_iterator(); |
154
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while (my $id = $iterator->()) { |
155
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my $blob = $comix->get(id => $id); |
156
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# ... $blob contains the image data... |
157
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} |
158
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159
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# I'd like to save it immediately, in directory /path/to/comix |
160
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WWW::Comix->probe(); # only one probe is necessary! |
161
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my $comix = WWW::Comix->new( |
162
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comic => $feature, directory => '/path/to/comix'); |
163
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my $iterator = $comix->get_id_iterator(); |
164
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while (my $id = $iterator->()) { |
165
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my $filename = $comix->getstore(id => $id); |
166
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# filename is somewhat guessed but should be ok most times |
167
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# see docs for ways to set your filename/filename rules |
168
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} |
169
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170
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171
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=head1 DESCRIPTION |
172
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173
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This modules eases the programmatical access to comic publishing sites. |
174
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It deals with the differences in any of them, providing you with an |
175
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abstraction layer that hides all the weird bits. New sites can be |
176
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added easily by means of its plugin system. |
177
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178
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The philosophy, and many ideas, have been taken by the excellent |
179
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L<WWW::Comic> by Nicola Worthington. In particular, the idea of |
180
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"probing" and the general organisation of the plugins is more or less |
181
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the same. Why another module then? The main thing that is lacking in |
182
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L<WWW::Comic> is a way to programmatically access the whole list |
183
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of available comics in a site. |
184
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185
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In particular, L<WWW::Comic> allows you to specify an id for the feature |
186
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you're interested into, but when it comes to knowing which ids are |
187
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actually available you're on your own. L<WWW::Comix> fills this gap. |
188
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189
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This module acts as a front-end towards the various plugins that do |
190
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the actual work behind the scenes. To get an "agent" for comic download |
191
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you'll need to know - ehr - which comic you're interested into: |
192
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193
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my $comix = WWW::Comix->new(comic => $feature, probe => 'ok'); |
194
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195
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Whether you need to probe or not depends on your application. If you |
196
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already probed before, chances are that you don't need to do that |
197
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again. |
198
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199
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Every plugin behaves the same, and you should take a look to |
200
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L<WWW::Comix::Plugin> to see the exact behaviour. Anyway, you can |
201
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access the list of available ids in basically two manners: |
202
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203
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=over |
204
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205
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=item B<< $comix->get_available_ids() >> |
206
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207
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gives the full list of available comics, and |
208
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209
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=item B<< $comix->get_iterator() >> |
210
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gives you an iterator, i.e. a sub reference that will give out |
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an id each time you call it, until there's no more in which case |
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it will give back C<undef>. |
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=back |
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Again, whether it's better for you to use one or another depends |
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entirely on your application. In general, the B<iterator> way is |
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safer, because some providers can have very long lists, spread over |
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many pages, so getting the full list can be heavy. When in doubt, |
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use the iterator. |
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Now that you have one (or more) ids, you only have to grab the comics |
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you need. You can either get the image's data: |
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my $blob = $comix->get(id => $id); |
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or save it directly to a file: |
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my $filename = $comix->getstore(id => $id); |
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Plugins (should) do their best to guess the filename correctly, but |
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you can get in the loop anyway: |
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$comix->getstore(id => $id, filename => 'whatever.png'); |
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By default, C<getstore> saves in the current directory, but you can |
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provide a C<directory> parameter to the constructor, or set it later: |
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my $comix = WWW::Comix->new( |
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comic => $feature, |
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probe => 'ok', |
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directory => '/path/to/somewhere', |
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); |
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$comix->set_directory('/path/to/somewhere/else'); |
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247
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See L<WWW::Comix::Plugin> if you need more flexibility. |
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249
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=head2 An Important Note |
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251
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Beware that there's a difference between the tool and using the tool. |
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253
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Whether you're allowed to use this module, and the tools that come with |
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it, is entirely up to you. This collection of modules gives you a |
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framework for accessing comics programmatically, shaping it around a |
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metaphor that proves to be effective in the most popular comics sites. |
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On the other hand, the fact that these pieces of software are there |
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does not mean that you're allowed to use them. You should peruse the |
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documentation of every and each site before deciding that you can |
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use it; moreover, when you do it you understand that you'll be the |
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sole responsible. In poor's man words, if the rules of the particular |
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site say that you're not allowed to systematically download features, |
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or access the site with anything different from a web browser, than |
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you should either get permissions or refrain from using the module. |
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Note that I don't even support the idea that this module, and the tools |
267
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that come with it, can be regarded as a browser. |
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269
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If you're even in doubt about your possibility to use it, chances are |
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that you're not allowed to do, so I urge you B<NOT> to use it. See also |
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the L</DISCLAIMER OF WARRANTY> and L</NEGAZIONE DELLA GARANZIA>. |
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273
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274
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=head1 INTERFACE |
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276
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All the following subs are package methods, so you should invoke them |
277
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using the object-oriented style. |
278
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279
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=over |
280
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281
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=item B<< new >> |
282
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283
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get a handler to some object capable of dealing with a specific comic. |
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285
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Returns a reference if successful, croaks otherwise. |
286
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287
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Arguments include: |
288
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289
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=over |
290
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291
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=item B<< comic >> (mandatory) |
292
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293
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the comic you want to interact with; |
294
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295
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=item B<< plugin >> (optional) |
296
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297
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the plugin you want to use. Usually, WWW::Comix will try to find out |
298
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the best plugin for handling a specific comic, but you might want to |
299
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override its choice. |
300
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301
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=item B<< probe >> (optional) |
302
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303
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request the plugins to probe the respective web pages; |
304
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305
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=item I<< any other >> |
306
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307
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all other parameters are passed to the actual plugin constructor, |
308
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see the relevant page for any additional information. |
309
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310
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=back |
311
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312
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=item B<< probe >> |
313
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314
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command a probing on all available plugins. This means that each of them |
315
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will likely access the site it's bound to in order to retrieve the relevant |
316
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information about available comics. |
317
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318
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Does not return anything meaningful. Does not need any parameter. |
319
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320
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=item B<< get_plugins >> |
321
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322
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get the list of available plugins. |
323
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324
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Returns the list of plugins in list context, a reference to an array |
325
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with the list in scalar context. Does not need parameters. |
326
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327
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This method is independent of the probing status. |
328
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329
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=item B<< get_plugins_priorities >> |
330
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331
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get the priority associated to each plugin. |
332
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333
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Each plugin is associated to a priority. The lower the priority, the first |
334
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the plugin is tried in a quest to find out who deals with a specific |
335
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feature. The rationale is that many sites have overlaps on the comics |
336
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they offer, but some might offer a longer archive (hence a better |
337
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priority). |
338
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339
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Each plugin "publishes" its priority, so this is actually nothing you |
340
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have to worry about: it's all done automatically. |
341
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342
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In list context, |
343
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returns a hash with the associations between the plugin names and their |
344
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priorities. Returns a reference to the hash in scalar context. Does not |
345
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need parameters. |
346
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347
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=item B<< get_plugins_capabilities >> |
348
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349
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get the comics that each plugin is capable of providing. |
350
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351
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Returns a hash with the plugin names as keys, and a reference to an array |
352
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with the supported comics as values, in list context. Returns a reference |
353
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to the hash in scalar context. |
354
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355
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Most likely, you |
356
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will need to have L</probe>d before, or you have to specify the C<probe> |
357
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|
parameter to get meaningful results, but it might depend on the |
358
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|
particular feature you're interested into (and in the particular plugin that |
359
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|
|
is able to handle the feature itself). |
360
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361
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=item B<< get_comics_list >> |
362
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363
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get the list of all supported comics, with the plugins that are able |
364
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to provide them. |
365
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366
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This is some counterpart to L</get_plugins_capabilities>. For each comic, |
367
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a list of the available providers is established, where "better" plugins |
368
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(in the sense of better priorities) come first. |
369
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370
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In list context, |
371
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returns a hash with the comic names as keys, and an array reference to the |
372
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providers for each of them as values. Returns a reference to the hash in |
373
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scalar context. |
374
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375
|
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Most likely, you |
376
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will need to have L</probe>d before, or you have to specify the C<probe> |
377
|
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parameter to get meaningful results, but it might depend on the |
378
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particular feature you're interested into (and in the particular plugin that |
379
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is able to handle the feature itself). |
380
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381
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=back |
382
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383
|
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|
=head1 DIAGNOSTICS |
384
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385
|
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As a rule of thumb, every time there's an error you will get an |
386
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exception. Exceptions are thrown with C<croak>, warnings with C<carp>. |
387
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388
|
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|
=head2 Exceptions |
389
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390
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|
|
This module generates the following exceptions (be sure to look into |
391
|
|
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|
|
|
|
the sub-modules for other exceptions): |
392
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393
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=over |
394
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395
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=item C<< no comic specified >> |
396
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397
|
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you must provide a C<comic> parameter to the L</new> constructor method. |
398
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399
|
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=item C<< comic %s not available >> |
400
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401
|
|
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|
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sorry, it's not your lucky day. Try to double-check the comic name, and |
402
|
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|
|
to see if it matches the name of the comic in a specific site. |
403
|
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|
404
|
|
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|
|
You can use L</get_comics_list> to get a list of all supported comics. |
405
|
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|
|
406
|
|
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|
|
=item C<< no plugin for '%s' >> |
407
|
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|
408
|
|
|
|
|
|
|
in the L</new> method, you tried to ask for a specific plugin, but it |
409
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|
|
is not supported. |
410
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411
|
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|
=back |
412
|
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413
|
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|
|
|
=head2 Warnings |
414
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415
|
|
|
|
|
|
|
In some cases, exceptions thrown by a particular plugin could be |
416
|
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|
|
catched and given as warnings. For example, in the search for a plugin |
417
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|
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|
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|
|
capable of providing a specific comic, an error in a plugin is ignored, |
418
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|
|
in the hope that some other plugin will be able to take care of the |
419
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|
comic itself. |
420
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421
|
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422
|
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|
|
|
=head1 CONFIGURATION AND ENVIRONMENT |
423
|
|
|
|
|
|
|
|
424
|
|
|
|
|
|
|
WWW::Comix requires no configuration files or environment variables. |
425
|
|
|
|
|
|
|
|
426
|
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|
427
|
|
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|
|
|
|
=head1 DEPENDENCIES |
428
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429
|
|
|
|
|
|
|
The dependencies here are for the general WWW::Comix system: |
430
|
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431
|
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|
|
=over |
432
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433
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|
=item * |
434
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435
|
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|
HTML::Entities |
436
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437
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|
=item * |
438
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439
|
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|
HTML::LinkExtor |
440
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441
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=item * |
442
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443
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|
Module::Pluggable |
444
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445
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=item * |
446
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447
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|
Moose |
448
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449
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=item * |
450
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451
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|
Moose::Policy |
452
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453
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=item * |
454
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455
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Path::Class |
456
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457
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=item * |
458
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459
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Readonly |
460
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461
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=item * |
462
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463
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URI |
464
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465
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=item * |
466
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467
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version |
468
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469
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=item * |
470
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471
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WWW::Mechanize |
472
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473
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=back |
474
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475
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=head1 INCOMPATIBILITIES |
476
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477
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|
None reported. |
478
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479
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480
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=head1 BUGS AND LIMITATIONS |
481
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482
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No bugs have been reported. |
483
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484
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Please report any bugs or feature requests through http://rt.cpan.org/ |
485
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486
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487
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=head1 AUTHOR |
488
|
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489
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|
Flavio Poletti C<< <flavio [at] polettix [dot] it> >> |
490
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491
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492
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=head1 LICENCE AND COPYRIGHT |
493
|
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494
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|
Copyright (c) 2008, Flavio Poletti C<< <flavio [at] polettix [dot] it> >>. All rights reserved. |
495
|
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496
|
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This module is free software; you can redistribute it and/or |
497
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|
modify it under the same terms as Perl 5.8.x itself. See L<perlartistic> |
498
|
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|
and L<perlgpl>. |
499
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500
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|
Questo modulo è software libero: potete ridistribuirlo e/o |
501
|
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|
modificarlo negli stessi termini di Perl 5.8.x stesso. Vedete anche |
502
|
|
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|
L<perlartistic> e L<perlgpl>. |
503
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504
|
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|
=head1 DISCLAIMER OF WARRANTY |
505
|
|
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506
|
|
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|
|
BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY |
507
|
|
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|
|
FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN |
508
|
|
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|
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|
|
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES |
509
|
|
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|
|
|
|
PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER |
510
|
|
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|
|
EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
511
|
|
|
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|
|
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE |
512
|
|
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|
|
|
|
ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH |
513
|
|
|
|
|
|
|
YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL |
514
|
|
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|
|
NECESSARY SERVICING, REPAIR, OR CORRECTION. |
515
|
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516
|
|
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|
|
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING |
517
|
|
|
|
|
|
|
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR |
518
|
|
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|
|
|
|
REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE |
519
|
|
|
|
|
|
|
LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, |
520
|
|
|
|
|
|
|
OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE |
521
|
|
|
|
|
|
|
THE SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING |
522
|
|
|
|
|
|
|
RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A |
523
|
|
|
|
|
|
|
FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF |
524
|
|
|
|
|
|
|
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF |
525
|
|
|
|
|
|
|
SUCH DAMAGES. |
526
|
|
|
|
|
|
|
|
527
|
|
|
|
|
|
|
=head1 NEGAZIONE DELLA GARANZIA |
528
|
|
|
|
|
|
|
|
529
|
|
|
|
|
|
|
Poiché questo software viene dato con una licenza gratuita, non |
530
|
|
|
|
|
|
|
c'è alcuna garanzia associata ad esso, ai fini e per quanto permesso |
531
|
|
|
|
|
|
|
dalle leggi applicabili. A meno di quanto possa essere specificato |
532
|
|
|
|
|
|
|
altrove, il proprietario e detentore del copyright fornisce questo |
533
|
|
|
|
|
|
|
software "così com'è" senza garanzia di alcun tipo, sia essa espressa |
534
|
|
|
|
|
|
|
o implicita, includendo fra l'altro (senza però limitarsi a questo) |
535
|
|
|
|
|
|
|
eventuali garanzie implicite di commerciabilità e adeguatezza per |
536
|
|
|
|
|
|
|
uno scopo particolare. L'intero rischio riguardo alla qualità ed |
537
|
|
|
|
|
|
|
alle prestazioni di questo software rimane a voi. Se il software |
538
|
|
|
|
|
|
|
dovesse dimostrarsi difettoso, vi assumete tutte le responsabilità |
539
|
|
|
|
|
|
|
ed i costi per tutti i necessari servizi, riparazioni o correzioni. |
540
|
|
|
|
|
|
|
|
541
|
|
|
|
|
|
|
In nessun caso, a meno che ciò non sia richiesto dalle leggi vigenti |
542
|
|
|
|
|
|
|
o sia regolato da un accordo scritto, alcuno dei detentori del diritto |
543
|
|
|
|
|
|
|
di copyright, o qualunque altra parte che possa modificare, o redistribuire |
544
|
|
|
|
|
|
|
questo software così come consentito dalla licenza di cui sopra, potrà |
545
|
|
|
|
|
|
|
essere considerato responsabile nei vostri confronti per danni, ivi |
546
|
|
|
|
|
|
|
inclusi danni generali, speciali, incidentali o conseguenziali, derivanti |
547
|
|
|
|
|
|
|
dall'utilizzo o dall'incapacità di utilizzo di questo software. Ciò |
548
|
|
|
|
|
|
|
include, a puro titolo di esempio e senza limitarsi ad essi, la perdita |
549
|
|
|
|
|
|
|
di dati, l'alterazione involontaria o indesiderata di dati, le perdite |
550
|
|
|
|
|
|
|
sostenute da voi o da terze parti o un fallimento del software ad |
551
|
|
|
|
|
|
|
operare con un qualsivoglia altro software. Tale negazione di garanzia |
552
|
|
|
|
|
|
|
rimane in essere anche se i dententori del copyright, o qualsiasi altra |
553
|
|
|
|
|
|
|
parte, è stata avvisata della possibilità di tali danneggiamenti. |
554
|
|
|
|
|
|
|
|
555
|
|
|
|
|
|
|
Se decidete di utilizzare questo software, lo fate a vostro rischio |
556
|
|
|
|
|
|
|
e pericolo. Se pensate che i termini di questa negazione di garanzia |
557
|
|
|
|
|
|
|
non si confacciano alle vostre esigenze, o al vostro modo di |
558
|
|
|
|
|
|
|
considerare un software, o ancora al modo in cui avete sempre trattato |
559
|
|
|
|
|
|
|
software di terze parti, non usatelo. Se lo usate, accettate espressamente |
560
|
|
|
|
|
|
|
questa negazione di garanzia e la piena responsabilità per qualsiasi |
561
|
|
|
|
|
|
|
tipo di danno, di qualsiasi natura, possa derivarne. |
562
|
|
|
|
|
|
|
|
563
|
|
|
|
|
|
|
=cut |