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[quix0rs-gnu-social.git] / actions / tag.php
1 <?php
2 /*
3  * Laconica - a distributed open-source microblogging tool
4  * Copyright (C) 2008, Controlez-Vous, Inc.
5  *
6  * This program is free software: you can redistribute it and/or modify
7  * it under the terms of the GNU Affero General Public License as published by
8  * the Free Software Foundation, either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU Affero General Public License for more details.
15  *
16  * You should have received a copy of the GNU Affero General Public License
17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
18  */
19
20 if (!defined('LACONICA')) { exit(1); }
21
22 require_once(INSTALLDIR.'/actions/showstream.php');
23 define('TAGS_PER_PAGE', 100);
24
25 class TagAction extends StreamAction {
26
27         function handle($args) {
28
29                 parent::handle($args);
30
31                 # Looks like we're good; show the header
32
33                 if (isset($args['tag']) && $args['tag']) {
34                         $tag = $args['tag'];
35                         common_show_header(sprintf(_("Notices tagged with %s"), $tag),
36                                                            array($this, 'show_header'), $tag,
37                                                            array($this, 'show_top'));
38
39                         $this->show_notices($tag);
40                 } else {
41                         common_show_header(_("Tags"),
42                                                            array($this, 'show_header'), '',
43                                                            array($this, 'show_top'));
44                         $this->show_tags();
45                 }
46
47                 common_show_footer();
48         }
49
50         function show_header($tag = false) {
51                 if (false && $tag) {
52                         common_element('link', array('rel' => 'alternate',
53                                                                                  'href' => common_local_url('tagrss', array('tag' => $tag)),
54                                                                                  'type' => 'application/rss+xml',
55                                                                                  'title' => sprintf(_('Feed for tag %s'), $tag)));
56                 }
57         }
58
59         function get_instructions() {
60                 return _('Showing most popular tags from the last week');
61         }
62
63         function show_top($tag = false) {
64                 if (!$tag) {
65                         $instr = $this->get_instructions();
66                         $output = common_markup_to_html($instr);
67                         common_element_start('div', 'instructions');
68                         common_raw($output);
69                         common_element_end('div');
70                 }
71
72                 common_element_start('ul', array('id' => 'nav_views'));
73
74                 common_menu_item(common_local_url('tags'),
75                                                  _('Recent Tags'),
76                                                  _('Recent Tags'),
77                                                  !$tag);
78                 if ($tag) {
79                         common_menu_item(common_local_url('tag', array('tag' => $tag)),
80                                                          '#' . $tag,
81                                                          sprintf(_("Notices tagged with %s"), $tag),
82                                                          true);
83                 }
84                 common_element_end('ul');
85         }
86
87         function show_tags()
88         {
89                 # This should probably be cached rather than recalculated
90                 $tags = DB_DataObject::factory('Notice_tag');
91                 $tags->selectAdd('max(notice_id) as last_notice_id');
92                 $tags->selectAdd(sprintf('sum(exp(-(now() - created)/%f)) as weight', common_config('tag', 'dropoff')));
93                 $tags->groupBy('tag');
94                 $tags->orderBy('weight DESC');
95
96                 # $tags->whereAdd('created > "' . strftime('%Y-%m-%d %H:%M:%S', strtotime('-1 MONTH')) . '"');
97
98                 $tags->limit(TAGS_PER_PAGE);
99
100                 $cnt = $tags->find();
101
102                 if ($cnt > 0) {
103                         common_element_start('p', 'tagcloud');
104                         
105                         $tw = array();
106                         $sum = 0;
107                         while ($tags->fetch()) {
108                                 $tw[$tags->tag] = $tags->weight;
109                                 $sum += $tags->weight;
110                         }
111
112                         ksort($tw);
113                         
114                         foreach ($tw as $tag => $weight) {
115                                 $this->show_tag($tag, $weight, $weight/$sum);
116                         }
117
118                         common_element_end('p');
119                 }
120         }
121
122         function show_tag($tag, $weight, $relative) {
123
124                 # XXX: these should probably tune to the size of the site
125                 if ($relative > 0.1) {
126                         $cls =  'largest';
127                 } else if ($relative > 0.05) {
128                         $cls = 'verylarge';
129                 } else if ($relative > 0.02) {
130                         $cls = 'large';
131                 } else if ($relative > 0.01) {
132                         $cls = 'medium';
133                 } else if ($relative > 0.005) {
134                         $cls = 'small';
135                 } else if ($relative > 0.002) {
136                         $cls = 'verysmall';
137                 } else {
138                         $cls = 'smallest';
139                 }
140
141                 common_element('a', array('class' => "$cls weight-$weight relative-$relative",
142                                                                   'href' => common_local_url('tag', array('tag' => $tag))),
143                                            $tag);
144                 common_text(' ');
145         }
146
147         function show_notices($tag) {
148
149                 $tags = DB_DataObject::factory('Notice_tag');
150
151                 $tags->tag = $tag;
152
153                 $tags->orderBy('created DESC');
154
155                 $page = ($this->arg('page')) ? ($this->arg('page')+0) : 1;
156
157                 $tags->limit((($page-1)*NOTICES_PER_PAGE), NOTICES_PER_PAGE + 1);
158
159                 $cnt = $tags->find();
160
161                 if ($cnt > 0) {
162                         common_element_start('ul', array('id' => 'notices'));
163                         for ($i = 0; $i < min($cnt, NOTICES_PER_PAGE); $i++) {
164                                 if ($tags->fetch()) {
165                                         $notice = new Notice();
166                                         $notice->id = $tags->notice_id;
167                                         $result = $notice->find(true);
168                                         if (!$result) {
169                                                 continue;
170                                         }
171                                         $this->show_notice($notice);
172                                 } else {
173                                         // shouldn't happen!
174                                         break;
175                                 }
176                         }
177                         common_element_end('ul');
178                 }
179
180                 common_pagination($page > 1, $cnt > NOTICES_PER_PAGE,
181                                                   $page, 'tag', array('tag' => $tag));
182         }
183 }