gnu-social/actions/publictagcloud.php
Evan Prodromou 7f81597a81 isReadOnly() now takes arguments
Add an array of arguments to isReadOnly() method of actions, to let
them change their results depending on what actions are called.
Primarily used by the 'api' action. Ideally in the future that will be
multiple actions. But this might still be useful.
2009-04-13 15:55:25 -04:00

174 lines
5.1 KiB
PHP

<?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($args)
{
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 showEmptyList()
{
$message = _('No one has posted a notice with a [hashtag](%%doc.tags%%) yet.') . ' ';
if (common_logged_in()) {
$message .= _('Be the first to post one!');
}
else {
$message .= _('Why not [register an account](%%action.register%%) and be the first to post one!');
}
$this->elementStart('div', 'guide');
$this->raw(common_markup_to_html($message));
$this->elementEnd('div');
}
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('div', array('id' => 'tagcloud',
'class' => 'section'));
$tw = array();
$sum = 0;
while ($tags->fetch()) {
$tw[$tags->tag] = $tags->weight;
$sum += $tags->weight;
}
ksort($tw);
$this->elementStart('dl');
$this->element('dt', null, _('Tag cloud'));
$this->elementStart('dd');
$this->elementStart('ul', 'tags xoxo tag-cloud');
foreach ($tw as $tag => $weight) {
$this->showTag($tag, $weight, $weight/$sum);
}
$this->elementEnd('ul');
$this->elementEnd('dd');
$this->elementEnd('dl');
$this->elementEnd('div');
} else {
$this->showEmptyList();
}
}
function showTag($tag, $weight, $relative)
{
if ($relative > 0.1) {
$rel = 'tag-cloud-7';
} else if ($relative > 0.05) {
$rel = 'tag-cloud-6';
} else if ($relative > 0.02) {
$rel = 'tag-cloud-5';
} else if ($relative > 0.01) {
$rel = 'tag-cloud-4';
} else if ($relative > 0.005) {
$rel = 'tag-cloud-3';
} else if ($relative > 0.002) {
$rel = 'tag-cloud-2';
} else {
$rel = 'tag-cloud-1';
}
$this->elementStart('li', $rel);
$this->element('a', array('href' => common_local_url('tag', array('tag' => $tag))),
$tag);
$this->elementEnd('li');
}
}