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Diffstat (limited to 'actions/publictagcloud.php')
-rw-r--r-- | actions/publictagcloud.php | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/actions/publictagcloud.php b/actions/publictagcloud.php new file mode 100644 index 000000000..ec28edbad --- /dev/null +++ b/actions/publictagcloud.php @@ -0,0 +1,149 @@ +<?php +/** + * Laconica, the distributed open-source microblogging tool + * + * Public tag cloud for notices + * + * PHP version 5 + * + * LICENCE: This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * @category Public + * @package Laconica + * @author Mike Cochrane <mikec@mikenz.geek.nz> + * @author Evan Prodromou <evan@controlyourself.ca> + * @copyright 2008 Mike Cochrane + * @copyright 2008-2009 Control Yourself, Inc. + * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0 + * @link http://laconi.ca/ + */ + +if (!defined('LACONICA')) { exit(1); } + +define('TAGS_PER_PAGE', 100); + +/** + * Public tag cloud for notices + * + * @category Personal + * @package Laconica + * @author Mike Cochrane <mikec@mikenz.geek.nz> + * @author Evan Prodromou <evan@controlyourself.ca> + * @copyright 2008 Mike Cochrane + * @copyright 2008-2009 Control Yourself, Inc. + * @link http://laconi.ca/ + */ + +class PublictagcloudAction extends Action +{ + function isReadOnly() + { + return true; + } + + function title() + { + return _('Public tag cloud'); + } + + function showPageNotice() + { + $this->element('p', 'instructions', + sprintf(_('These are most popular recent tags on %s '), + common_config('site', 'name'))); + } + + function showLocalNav() + { + $nav = new PublicGroupNav($this); + $nav->show(); + } + + function handle($args) + { + parent::handle($args); + $this->showPage(); + } + + function showContent() + { + # This should probably be cached rather than recalculated + $tags = new Notice_tag(); + + #Need to clear the selection and then only re-add the field + #we are grouping by, otherwise it's not a valid 'group by' + #even though MySQL seems to let it slide... + $tags->selectAdd(); + $tags->selectAdd('tag'); + + #Add the aggregated columns... + $tags->selectAdd('max(notice_id) as last_notice_id'); + if(common_config('db','type')=='pgsql') { + $calc='sum(exp(-extract(epoch from (now()-created))/%s)) as weight'; + } else { + $calc='sum(exp(-(now() - created)/%s)) as weight'; + } + $tags->selectAdd(sprintf($calc, common_config('tag', 'dropoff'))); + $tags->groupBy('tag'); + $tags->orderBy('weight DESC'); + + $tags->limit(TAGS_PER_PAGE); + + $cnt = $tags->find(); + + if ($cnt > 0) { + $this->elementStart('p', 'tagcloud'); + + $tw = array(); + $sum = 0; + while ($tags->fetch()) { + $tw[$tags->tag] = $tags->weight; + $sum += $tags->weight; + } + + ksort($tw); + + foreach ($tw as $tag => $weight) { + $this->showTag($tag, $weight, $weight/$sum); + } + + $this->elementEnd('p'); + } + } + + function showTag($tag, $weight, $relative) + { + # XXX: these should probably tune to the size of the site + if ($relative > 0.1) { + $cls = 'largest'; + } else if ($relative > 0.05) { + $cls = 'verylarge'; + } else if ($relative > 0.02) { + $cls = 'large'; + } else if ($relative > 0.01) { + $cls = 'medium'; + } else if ($relative > 0.005) { + $cls = 'small'; + } else if ($relative > 0.002) { + $cls = 'verysmall'; + } else { + $cls = 'smallest'; + } + + $this->element('a', array('class' => "$cls weight-$weight relative-$relative", + 'href' => common_local_url('tag', array('tag' => $tag))), + $tag); + $this->text(' '); + } +} |