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 define('AGE_FACTOR', 864000.0);
  25
  26 class TagAction extends StreamAction {
  27
  28         function handle($args) {
  29
  30                 parent::handle($args);
  31
  32                 # Looks like we're good; show the header
  33
  34                 if (isset($args['tag']) && $args['tag']) {
  35                         $tag = $args['tag'];
  36                         common_show_header(sprintf(_("Notices tagged with %s"), $tag),
  37                                                            array($this, 'show_header'), $tag,
  38                                                            array($this, 'show_top'));
  39
  40                         $this->show_notices($tag);
  41                 } else {
  42                         common_show_header(_("Tags"),
  43                                                            array($this, 'show_header'), '',
  44                                                            array($this, 'show_top'));
  45                         $this->show_tags();
  46                 }
  47
  48                 common_show_footer();
  49         }
  50
  51         function show_header($tag = false) {
  52                 if (false && $tag) {
  53                         common_element('link', array('rel' => 'alternate',
  54                                                                                  'href' => common_local_url('tagrss', array('tag' => $tag)),
  55                                                                                  'type' => 'application/rss+xml',
  56                                                                                  'title' => sprintf(_('Feed for tag %s'), $tag)));
  57                 }
  58         }
  59
  60         function get_instructions() {
  61                 return _('Showing most popular tags from the last week');
  62         }
  63
  64         function show_top($tag = false) {
  65                 if (!$tag) {
  66                         $instr = $this->get_instructions();
  67                         $output = common_markup_to_html($instr);
  68                         common_element_start('div', 'instructions');
  69                         common_raw($output);
  70                         common_element_end('div');
  71                 }
  72
  73                 common_element_start('ul', array('id' => 'nav_views'));
  74
  75                 common_menu_item(common_local_url('tags'),
  76                                                  _('Recent Tags'),
  77                                                  _('Recent Tags'),
  78                                                  !$tag);
  79                 if ($tag) {
  80                         common_menu_item(common_local_url('tag', array('tag' => $tag)),
  81                                                          '#' . $tag,
  82                                                          sprintf(_("Notices tagged with %s"), $tag),
  83                                                          true);
  84                 }
  85                 common_element_end('ul');
  86         }
  87
  88         function show_tags()
  89         {
  90                 # This should probably be cached rather than recalculated
  91                 $tags = DB_DataObject::factory('Notice_tag');
  92                 $tags->selectAdd('max(notice_id) as last_notice_id');
  93                 $tags->selectAdd(sprintf('sum(exp(-(now() - created)/%f)) as weight', AGE_FACTOR));
  94                 $tags->groupBy('tag');
  95                 $tags->orderBy('weight DESC');
  96
  97                 # $tags->whereAdd('created > "' . strftime('%Y-%m-%d %H:%M:%S', strtotime('-1 MONTH')) . '"');
  98
  99                 $tags->limit(TAGS_PER_PAGE);
 100
 101                 $cnt = $tags->find();
 102
 103                 if ($cnt > 0) {
 104                         common_element_start('p', 'tagcloud');
 105
 106                         $tw = array();
 107                         $sum = 0;
 108                         while ($tags->fetch()) {
 109                                 $tw[$tags->tag] = $tags->weight;
 110                                 $sum += $tags->weight;
 111                         }
 112
 113                         foreach ($tw as $tag => $weight) {
 114                                 $this->show_tag($tag, $weight, $weight/$sum);
 115                         }
 116
 117                         common_element_end('p');
 118                 }
 119         }
 120
 121         function show_tag($tag, $weight, $relative) {
 122
 123                 # XXX: these should probably tune to the size of the site
 124                 $cls = ($relative > 0.1) ? 'largest' :
 125                 ($relative > 0.05) ? 'verylarge' :
 126                 ($relative > 0.02) ? 'large' :
 127                 ($relative > 0.01) ? 'medium' :
 128                 ($relative > 0.005) ? 'small' :
 129                 ($relative > 0.002) ? 'verysmall' :
 130                 'smallest';
 131
 132                 common_element('a', array('class' => "$cls weight-$weight relative-$relative",
 133                                                                   'href' => common_local_url('tag', array('tag' => $tag))),
 134                                            $tag);
 135                 common_text(' ');
 136         }
 137
 138         function show_notices($tag) {
 139
 140                 $tags = DB_DataObject::factory('Notice_tag');
 141
 142                 $tags->tag = $tag;
 143
 144                 $tags->orderBy('created DESC');
 145
 146                 $page = ($this->arg('page')) ? ($this->arg('page')+0) : 1;
 147
 148                 $tags->limit((($page-1)*NOTICES_PER_PAGE), NOTICES_PER_PAGE + 1);
 149
 150                 $cnt = $tags->find();
 151
 152                 if ($cnt > 0) {
 153                         common_element_start('ul', array('id' => 'notices'));
 154                         for ($i = 0; $i < min($cnt, NOTICES_PER_PAGE); $i++) {
 155                                 if ($tags->fetch()) {
 156                                         $notice = new Notice();
 157                                         $notice->id = $tags->notice_id;
 158                                         $result = $notice->find(true);
 159                                         if (!$result) {
 160                                                 continue;
 161                                         }
 162                                         $this->show_notice($notice);
 163                                 } else {
 164                                         // shouldn't happen!
 165                                         break;
 166                                 }
 167                         }
 168                         common_element_end('ul');
 169                 }
 170
 171                 common_pagination($page > 1, $cnt > NOTICES_PER_PAGE,
 172                                                   $page, 'tag', array('tag' => $tag));
 173         }
 174 }