gnu-social/actions/tag.php

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<?php
/*
* Laconica - a distributed open-source microblogging tool
* Copyright (C) 2008, Controlez-Vous, Inc.
*
* 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/>.
*/
if (!defined('LACONICA')) { exit(1); }
require_once(INSTALLDIR.'/actions/showstream.php');
define('TAGS_PER_PAGE', 100);
class TagAction extends StreamAction {
function handle($args) {
parent::handle($args);
# Looks like we're good; show the header
if (isset($args['tag']) && $args['tag']) {
$tag = $args['tag'];
common_show_header(sprintf(_("Notices tagged with %s"), $tag),
array($this, 'show_header'), $tag,
array($this, 'show_top'));
$this->show_notices($tag);
} else {
common_show_header(_("Tags"),
array($this, 'show_header'), '',
array($this, 'show_top'));
$this->show_tags();
}
common_show_footer();
}
function show_header($tag = false) {
if ($tag) {
common_element('link', array('rel' => 'alternate',
'href' => common_local_url('tagrss', array('tag' => $tag)),
'type' => 'application/rss+xml',
'title' => sprintf(_('Feed for tag %s'), $tag)));
}
}
function get_instructions() {
return _('Showing most popular tags from the last week');
}
function show_top($tag = false) {
if (!$tag) {
$instr = $this->get_instructions();
$output = common_markup_to_html($instr);
common_element_start('div', 'instructions');
common_raw($output);
common_element_end('div');
}
common_element_start('ul', array('id' => 'nav_views'));
common_menu_item(common_local_url('tags'),
_('Recent Tags'),
_('Recent Tags'),
!$tag);
if ($tag) {
common_menu_item(common_local_url('tag', array('tag' => $tag)),
'#' . $tag,
sprintf(_("Notices tagged with %s"), $tag),
true);
}
common_element_end('ul');
}
function show_tags()
{
# This should probably be cached rather than recalculated
$tags = DB_DataObject::factory('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->whereAdd('created > "' . strftime('%Y-%m-%d %H:%M:%S', strtotime('-1 MONTH')) . '"');
$tags->limit(TAGS_PER_PAGE);
$cnt = $tags->find();
if ($cnt > 0) {
common_element_start('p', 'tagcloud');
$tw = array();
$sum = 0;
while ($tags->fetch()) {
$tw[$tags->tag] = $tags->weight;
$sum += $tags->weight;
}
ksort($tw);
foreach ($tw as $tag => $weight) {
$this->show_tag($tag, $weight, $weight/$sum);
}
common_element_end('p');
}
}
function show_tag($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 {
$cls = 'smallest';
}
common_element('a', array('class' => "$cls weight-$weight relative-$relative",
'href' => common_local_url('tag', array('tag' => $tag))),
$tag);
common_text(' ');
}
function show_notices($tag) {
$cnt = 0;
$page = ($this->arg('page')) ? ($this->arg('page')+0) : 1;
$notice = Notice_tag::getStream($tag, (($page-1)*NOTICES_PER_PAGE), NOTICES_PER_PAGE + 1);
if ($notice) {
common_element_start('ul', array('id' => 'notices'));
while ($notice->fetch()) {
$cnt++;
if ($cnt > NOTICES_PER_PAGE) {
break;
}
$this->show_notice($notice);
}
common_element_end('ul');
}
common_pagination($page > 1, $cnt > NOTICES_PER_PAGE,
$page, 'tag', array('tag' => $tag));
}
}