actions/tag.php

   1 <?php
   2 /*
   3  * Laconica - a distributed open-source microblogging tool
   4  * Copyright (C) 2008, Controlez-Vous, Inc.
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU Affero General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU Affero General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Affero General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 if (!defined('LACONICA')) { exit(1); }
  21
  22 require_once(INSTALLDIR.'/actions/showstream.php');
  23 define('TAGS_PER_PAGE', 100);
  24
  25 class TagAction extends StreamAction {
  26
  27         function handle($args) {
  28
  29                 parent::handle($args);
  30
  31                 # Looks like we're good; show the header
  32
  33                 if (isset($args['tag']) && $args['tag']) {
  34                         $tag = $args['tag'];
  35                         common_show_header(sprintf(_("Notices tagged with %s"), $tag),
  36                                                            array($this, 'show_header'), $tag,
  37                                                            array($this, 'show_top'));
  38                         $this->show_notices($tag);
  39                 } else {
  40                         common_show_header(_("Tags"),
  41                                                            array($this, 'show_header'), '',
  42                                                            array($this, 'show_top'));
  43                         $this->show_tags();
  44                 }
  45
  46                 common_show_footer();
  47         }
  48
  49         function show_header($tag = false) {
  50                 if ($tag) {
  51                         common_element('link', array('rel' => 'alternate',
  52                                                                                  'href' => common_local_url('tagrss', array('tag' => $tag)),
  53                                                                                  'type' => 'application/rss+xml',
  54                                                                                  'title' => sprintf(_('Feed for tag %s'), $tag)));
  55                 }
  56         }
  57
  58         function get_instructions() {
  59                 return _('Showing most popular tags from the last week');
  60         }
  61
  62         function show_top($tag = false) {
  63                 if (!$tag) {
  64                         $instr = $this->get_instructions();
  65                         $output = common_markup_to_html($instr);
  66                         common_element_start('div', 'instructions');
  67                         common_raw($output);
  68                         common_element_end('div');
  69                         $this->public_views_menu();
  70                 }
  71                 else {
  72                         $this->show_feeds_list(array(0=>array('href'=>common_local_url('tagrss'),
  73                                                                                                   'type' => 'rss',
  74                                                                                                   'version' => 'RSS 1.0',
  75                                                                                                   'item' => 'tagrss')));
  76                 }
  77         }
  78
  79         function show_tags()
  80         {
  81                 # This should probably be cached rather than recalculated
  82                 $tags = DB_DataObject::factory('Notice_tag');
  83
  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...
  87                 $tags->selectAdd();
  88                 $tags->selectAdd('tag');
  89
  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';
  94                 } else {
  95                         $calc='sum(exp(-(now() - created)/%s)) as weight';
  96                 }
  97                 $tags->selectAdd(sprintf($calc, common_config('tag', 'dropoff')));
  98                 $tags->groupBy('tag');
  99                 $tags->orderBy('weight DESC');
 100
 101                 # $tags->whereAdd('created > "' . strftime('%Y-%m-%d %H:%M:%S', strtotime('-1 MONTH')) . '"');
 102
 103                 $tags->limit(TAGS_PER_PAGE);
 104
 105                 $cnt = $tags->find();
 106
 107                 if ($cnt > 0) {
 108                         common_element_start('p', 'tagcloud');
 109
 110                         $tw = array();
 111                         $sum = 0;
 112                         while ($tags->fetch()) {
 113                                 $tw[$tags->tag] = $tags->weight;
 114                                 $sum += $tags->weight;
 115                         }
 116
 117                         ksort($tw);
 118
 119                         foreach ($tw as $tag => $weight) {
 120                                 $this->show_tag($tag, $weight, $weight/$sum);
 121                         }
 122
 123                         common_element_end('p');
 124                 }
 125         }
 126
 127         function show_tag($tag, $weight, $relative) {
 128
 129                 # XXX: these should probably tune to the size of the site
 130                 if ($relative > 0.1) {
 131                         $cls =  'largest';
 132                 } else if ($relative > 0.05) {
 133                         $cls = 'verylarge';
 134                 } else if ($relative > 0.02) {
 135                         $cls = 'large';
 136                 } else if ($relative > 0.01) {
 137                         $cls = 'medium';
 138                 } else if ($relative > 0.005) {
 139                         $cls = 'small';
 140                 } else if ($relative > 0.002) {
 141                         $cls = 'verysmall';
 142                 } else {
 143                         $cls = 'smallest';
 144                 }
 145
 146                 common_element('a', array('class' => "$cls weight-$weight relative-$relative",
 147                                                                   'href' => common_local_url('tag', array('tag' => $tag))),
 148                                            $tag);
 149                 common_text(' ');
 150         }
 151
 152         function show_notices($tag) {
 153
 154                 $cnt = 0;
 155
 156                 $page = ($this->arg('page')) ? ($this->arg('page')+0) : 1;
 157
 158                 $notice = Notice_tag::getStream($tag, (($page-1)*NOTICES_PER_PAGE), NOTICES_PER_PAGE + 1);
 159
 160         $cnt = $this->show_notice_list($notice);
 161
 162                 common_pagination($page > 1, $cnt > NOTICES_PER_PAGE,
 163                                                   $page, 'tag', array('tag' => $tag));
 164         }
 165 }