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
50 function isReadOnly($args)
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 showEmptyList()
69 $message = _('No one has posted a notice with a [hashtag](%%doc.tags%%) yet.') . ' ';
71 if (common_logged_in()) {
72 $message .= _('Be the first to post one!');
75 $message .= sprintf(_('Why not [register an account](%%%%action.%s%%%%) and be the first to post one!'),
76 (!common_config('site','openidonly')) ? 'register' : 'openidlogin');
79 $this->elementStart('div', 'guide');
80 $this->raw(common_markup_to_html($message));
81 $this->elementEnd('div');
84 function showLocalNav()
86 $nav = new PublicGroupNav($this);
90 function handle($args)
92 parent::handle($args);
96 function showContent()
98 # This should probably be cached rather than recalculated
99 $tags = new Notice_tag();
101 #Need to clear the selection and then only re-add the field
102 #we are grouping by, otherwise it's not a valid 'group by'
103 #even though MySQL seems to let it slide...
105 $tags->selectAdd('tag');
107 #Add the aggregated columns...
108 $tags->selectAdd('max(notice_id) as last_notice_id');
109 if(common_config('db','type')=='pgsql') {
110 $calc='sum(exp(-extract(epoch from (now()-created))/%s)) as weight';
112 $calc='sum(exp(-(now() - created)/%s)) as weight';
114 $tags->selectAdd(sprintf($calc, common_config('tag', 'dropoff')));
115 $tags->groupBy('tag');
116 $tags->orderBy('weight DESC');
118 $tags->limit(TAGS_PER_PAGE);
120 $cnt = $tags->find();
123 $this->elementStart('div', array('id' => 'tagcloud',
124 'class' => 'section'));
128 while ($tags->fetch()) {
129 $tw[$tags->tag] = $tags->weight;
130 $sum += $tags->weight;
135 $this->elementStart('dl');
136 $this->element('dt', null, _('Tag cloud'));
137 $this->elementStart('dd');
138 $this->elementStart('ul', 'tags xoxo tag-cloud');
139 foreach ($tw as $tag => $weight) {
140 $this->showTag($tag, $weight, $weight/$sum);
142 $this->elementEnd('ul');
143 $this->elementEnd('dd');
144 $this->elementEnd('dl');
145 $this->elementEnd('div');
147 $this->showEmptyList();
151 function showTag($tag, $weight, $relative)
153 if ($relative > 0.1) {
154 $rel = 'tag-cloud-7';
155 } else if ($relative > 0.05) {
156 $rel = 'tag-cloud-6';
157 } else if ($relative > 0.02) {
158 $rel = 'tag-cloud-5';
159 } else if ($relative > 0.01) {
160 $rel = 'tag-cloud-4';
161 } else if ($relative > 0.005) {
162 $rel = 'tag-cloud-3';
163 } else if ($relative > 0.002) {
164 $rel = 'tag-cloud-2';
166 $rel = 'tag-cloud-1';
169 $this->elementStart('li', $rel);
170 $this->element('a', array('href' => common_local_url('tag', array('tag' => $tag))),
172 $this->elementEnd('li');