3 * Laconica, the distributed open-source microblogging tool
5 * Public tag cloud for notices
9 * LICENCE: This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU Affero General Public License as published by
11 * the Free Software Foundation, either version 3 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU Affero General Public License for more details.
19 * You should have received a copy of the GNU Affero General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 * @author Mike Cochrane <mikec@mikenz.geek.nz>
25 * @author Evan Prodromou <evan@controlyourself.ca>
26 * @copyright 2008 Mike Cochrane
27 * @copyright 2008-2009 Control Yourself, Inc.
28 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
29 * @link http://laconi.ca/
32 if (!defined('LACONICA')) { exit(1); }
34 define('TAGS_PER_PAGE', 100);
37 * Public tag cloud for notices
41 * @author Mike Cochrane <mikec@mikenz.geek.nz>
42 * @author Evan Prodromou <evan@controlyourself.ca>
43 * @copyright 2008 Mike Cochrane
44 * @copyright 2008-2009 Control Yourself, Inc.
45 * @link http://laconi.ca/
48 class PublictagcloudAction extends Action
57 return _('Public tag cloud');
60 function showPageNotice()
62 $this->element('p', 'instructions',
63 sprintf(_('These are most popular recent tags on %s '),
64 common_config('site', 'name')));
67 function showLocalNav()
69 $nav = new PublicGroupNav($this);
73 function handle($args)
75 parent::handle($args);
79 function showContent()
81 # This should probably be cached rather than recalculated
82 $tags = new Notice_tag();
84 #Need to clear the selection and then only re-add the field
85 #we are grouping by, otherwise it's not a valid 'group by'
86 #even though MySQL seems to let it slide...
88 $tags->selectAdd('tag');
90 #Add the aggregated columns...
91 $tags->selectAdd('max(notice_id) as last_notice_id');
92 if(common_config('db','type')=='pgsql') {
93 $calc='sum(exp(-extract(epoch from (now()-created))/%s)) as weight';
95 $calc='sum(exp(-(now() - created)/%s)) as weight';
97 $tags->selectAdd(sprintf($calc, common_config('tag', 'dropoff')));
98 $tags->groupBy('tag');
99 $tags->orderBy('weight DESC');
101 $tags->limit(TAGS_PER_PAGE);
103 $cnt = $tags->find();
106 $this->elementStart('div', array('id' => 'tagcloud',
107 'class' => 'section'));
111 while ($tags->fetch()) {
112 $tw[$tags->tag] = $tags->weight;
113 $sum += $tags->weight;
118 $this->elementStart('dl');
119 $this->element('dt', null, _('Tag cloud'));
120 $this->elementStart('dd');
121 $this->elementStart('ul', 'tags xoxo tag-cloud');
122 foreach ($tw as $tag => $weight) {
123 $this->showTag($tag, $weight, $weight/$sum);
125 $this->elementEnd('ul');
126 $this->elementEnd('dd');
127 $this->elementEnd('dl');
128 $this->elementEnd('div');
132 function showTag($tag, $weight, $relative)
134 if ($relative > 0.1) {
135 $rel = 'tag-cloud-7';
136 } else if ($relative > 0.05) {
137 $rel = 'tag-cloud-6';
138 } else if ($relative > 0.02) {
139 $rel = 'tag-cloud-5';
140 } else if ($relative > 0.01) {
141 $rel = 'tag-cloud-4';
142 } else if ($relative > 0.005) {
143 $rel = 'tag-cloud-3';
144 } else if ($relative > 0.002) {
145 $rel = 'tag-cloud-2';
147 $rel = 'tag-cloud-1';
150 $this->elementStart('li', $rel);
151 $this->element('a', array('href' => common_local_url('tag', array('tag' => $tag))),
153 $this->elementEnd('li');