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
  39                         $this->show_notices($tag);
  40                 } else {
  41                         common_show_header(_("Tags"),
  42                                                            array($this, 'show_header'), '',
  43                                                            array($this, 'show_top'));
  44                         $this->show_tags();
  45                 }
  46
  47                 common_show_footer();
  48         }
  49
  50         function show_header($tag = false) {
  51                 if ($tag) {
  52                         common_element('link', array('rel' => 'alternate',
  53                                                                                  'href' => common_local_url('tagrss', array('tag' => $tag)),
  54                                                                                  'type' => 'application/rss+xml',
  55                                                                                  'title' => sprintf(_('Feed for tag %s'), $tag)));
  56                 }
  57         }
  58
  59         function get_instructions() {
  60                 return _('Showing most popular tags from the last week');
  61         }
  62
  63         function show_top($tag = false) {
  64                 if (!$tag) {
  65                         $instr = $this->get_instructions();
  66                         $output = common_markup_to_html($instr);
  67                         common_element_start('div', 'instructions');
  68                         common_raw($output);
  69                         common_element_end('div');
  70                         $this->public_views_menu();
  71                 }
  72         }
  73
  74         function show_tags()
  75         {
  76                 # This should probably be cached rather than recalculated
  77                 $tags = DB_DataObject::factory('Notice_tag');
  78
  79                 #Need to clear the selection and then only re-add the field
  80                 #we are grouping by, otherwise it's not a valid 'group by'
  81                 #even though MySQL seems to let it slide...
  82                 $tags->selectAdd();
  83                 $tags->selectAdd('tag');
  84
  85                 #Add the aggregated columns...
  86                 $tags->selectAdd('max(notice_id) as last_notice_id');
  87                 if(common_config('db','type')=='pgsql') {
  88                         $calc='sum(exp(-extract(epoch from (now()-created))/%s)) as weight';
  89                 } else {
  90                         $calc='sum(exp(-(now() - created)/%s)) as weight';
  91                 }
  92                 $tags->selectAdd(sprintf($calc, common_config('tag', 'dropoff')));
  93                 $tags->groupBy('tag');
  94                 $tags->orderBy('weight DESC');
  95
  96                 # $tags->whereAdd('created > "' . strftime('%Y-%m-%d %H:%M:%S', strtotime('-1 MONTH')) . '"');
  97
  98                 $tags->limit(TAGS_PER_PAGE);
  99
 100                 $cnt = $tags->find();
 101
 102                 if ($cnt > 0) {
 103                         common_element_start('p', 'tagcloud');
 104
 105                         $tw = array();
 106                         $sum = 0;
 107                         while ($tags->fetch()) {
 108                                 $tw[$tags->tag] = $tags->weight;
 109                                 $sum += $tags->weight;
 110                         }
 111
 112                         ksort($tw);
 113
 114                         foreach ($tw as $tag => $weight) {
 115                                 $this->show_tag($tag, $weight, $weight/$sum);
 116                         }
 117
 118                         common_element_end('p');
 119                 }
 120         }
 121
 122         function show_tag($tag, $weight, $relative) {
 123
 124                 # XXX: these should probably tune to the size of the site
 125                 if ($relative > 0.1) {
 126                         $cls =  'largest';
 127                 } else if ($relative > 0.05) {
 128                         $cls = 'verylarge';
 129                 } else if ($relative > 0.02) {
 130                         $cls = 'large';
 131                 } else if ($relative > 0.01) {
 132                         $cls = 'medium';
 133                 } else if ($relative > 0.005) {
 134                         $cls = 'small';
 135                 } else if ($relative > 0.002) {
 136                         $cls = 'verysmall';
 137                 } else {
 138                         $cls = 'smallest';
 139                 }
 140
 141                 common_element('a', array('class' => "$cls weight-$weight relative-$relative",
 142                                                                   'href' => common_local_url('tag', array('tag' => $tag))),
 143                                            $tag);
 144                 common_text(' ');
 145         }
 146
 147         function show_notices($tag) {
 148
 149                 $cnt = 0;
 150
 151                 $page = ($this->arg('page')) ? ($this->arg('page')+0) : 1;
 152
 153                 $notice = Notice_tag::getStream($tag, (($page-1)*NOTICES_PER_PAGE), NOTICES_PER_PAGE + 1);
 154
 155                 if ($notice) {
 156                         common_element_start('ul', array('id' => 'notices'));
 157                         while ($notice->fetch()) {
 158                                 $cnt++;
 159                                 if ($cnt > NOTICES_PER_PAGE) {
 160                                         break;
 161                                 }
 162                                 $this->show_notice($notice);
 163                         }
 164                         common_element_end('ul');
 165                 }
 166
 167                 common_pagination($page > 1, $cnt > NOTICES_PER_PAGE,
 168                                                   $page, 'tag', array('tag' => $tag));
 169         }
 170 }