source: wp-tags/tags/0.1.0/tags.php @ 1092

<?php
/*
Plugin Name: Tags
Plugin URI: http://boke.name/c/blog/wordpress-tags
Description: A plugin that tag each entry of the blog, and give a tag access method and tag list.
Author: Felix Wong
Author URI: http://boke.name/
Version: 0.1 alpha
Email: felix@cenrik.net

It is compatible with Wordpress 1.5.

Tags 0.1alpha
Copyright(C) 2005, Felix Wong

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
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 General Public License for more details.

*/

/*
INSTALLATION NOTES

1. Put tags.php into wp-content/plugins.

2. To install this plugin, you have to modify 3 wordpress files for Tags support.
        wp-admin/edit-form.php
        wp-admin/edit-form-advanced.php
        wp-admin/edit-page-form.php

or you can use the patch instead.

--- wp-admin/edit-form.php ---
--- LOOK FOR ---
    <fieldset id="titlediv">
      <legend><a href="http://wordpress.org/docs/reference/post/#title" title="<?php _e('Help on titles') ?>"><?php _e('Title') ?></a></legend>
          <div><input type="text" name="post_title" size="30" tabindex="1" value="<?php echo $edited_post_title; ?>" id="title" /></div>
    </fieldset>

-- ADD AFTER ---

    <!-- Tags Plugin Begin -->
    <fieldset id="titlediv">
        <legend><a href="http://boke.name/c/blog/wordpress-tags"><?php _e('Tags'); ?></a></legend>
        <div><input type="text" tabindex="2" name="post_tags" size="30" value="<?php echo $edited_post_tags; ?>" id="tags" /></div>
    </fieldset>
    <!-- Tags End -->

--- wp-admin/edit-form-advanced.php ---
--- LOOK FOR ---
</fieldset>
    <fieldset id="postpassworddiv">
      <legend><a href="http://wordpress.org/docs/reference/post/#post_password" title="<?php _e('Help on post password') ?>"><?php _e('Post Password') ?></a></legend>
          <div><input name="post_password" type="text" size="13" id="post_password" value="<?php echo $post_password ?>" /></div>
    </fieldset>

--- ADD AFTER ---
    <!-- Tags Plugin Begin -->
    <fieldset id="titlediv">
        <legend><a href="http://boke.name/c/blog/wordpress-tags"><?php _e('Tags'); ?></a></legend>
        <div><input type="text" tabindex="2" name="post_tags" size="30" value="<?php echo $edited_post_tags; ?>" id="tags" /></div>
    </fieldset>
    <!-- Tags End -->


--- wp-admin/edit-page-form.php ---
--- LOOK FOR ---
    <fieldset id="pageparent">
      <legend><?php _e('Page Parent') ?></legend>
          <div><select name="parent_id">
          <option value='0'><?php _e('Main Page (no parent)'); ?></option>
                        <?php parent_dropdown($post_parent); ?>
        </select>
          </div>
    </fieldset>

--- ADD AFTER ---
    <!-- Tags Plugin Begin -->
    <fieldset id="titlediv">
        <legend><a href="http://boke.name/c/blog/wordpress-tags"><?php _e('Tags'); ?></a></legend>
        <div><input tabindex="2" type="text" name="post_tags" size="30" value="<?php echo $edited_post_tags; ?>" id="tags" /></div>
    </fieldset>
    <!-- Tags End -->

3. Activate the plugin, go to Manage/Tags page so the plugin can create
a table for you. Then you can go to Options/Permal Link to generate
new Rewrite rules.

4. DONE.
You can access your tags with:
        http://website/index.php?tags=tag1+tag2
or, with permal link:
        http://website/tags/tag1+tag2
    
*/

function tags_add_menu() {
        add_management_page(__('Tags Management'), __('Tags'), 8, __FILE__, 'tags_tags_page');
        //add_options_page(__('Tags Management'), __('Tags'), 8, __FILE__, 'tags_settings_page');
}

function tags_tags_page() {
        global $wpdb, $WP_TAGS_ITEMS;

        $request = "SHOW TABLES;";
        $rows = $wpdb->get_results($request);
        $table1 = false;
        foreach($rows as $table) {
                foreach($table as $value) if($value==$WP_TAGS_ITEMS) $table1 = true;
        }

        if(!$table1) {
                $request = "CREATE TABLE `wp_tags_items` (
                        `tag_item_id` bigint(20) NOT NULL auto_increment,
                        `post_id` mediumint(9) NOT NULL default '0',
                        `tag_name` varchar(255) NOT NULL default '',
                        PRIMARY KEY  (`tag_item_id`),
                        KEY `post_id` (`post_id`,`tag_name`)
                );";
                $wpdb->query($request);
?>
        <div class="wrap">
                <h2><?=_e("Installation")?></h2>
                <p><?=_e("You are the first time to activate Tags plugin. The Tags table has been created for you to use Tags plugin. You may deactivate the plugin and delete the table manually.")?></p>
        </div>
<?
        }
        
        $request = "SELECT tag_name AS tag, COUNT(tag_item_id) AS `count` FROM $WP_TAGS_ITEMS GROUP BY tag_name";
        $rows = $wpdb->get_results($request);
?>

<div class="wrap">
        <h2><?=_e('Tags List')?></h2>
        <? foreach( $rows as $row ): ?>
        <a href="/tags/<?=rawurlencode($row->tag)?>"><?=$row->tag?>(<?=$row->count?>)</a>&nbsp;
        <? endforeach; ?>
</div>
<?

}

function tags_settings_page() {
        echo "<div class=\"wrap\">\n";
        echo "<h2>".__('Tag Settings')."</h2>\n";
        echo "</div>\n";
}


function tags_parse_query(&$param) {
        global $_tags;
        $wp_query =& $param;
        $tags = rawurldecode($wp_query->get('tags'));
        //$tags = iconv('GB2312', 'UTF-8', $tags);
        $tags = preg_split("/( )+/", $tags);
        $_tags = $tags;
}

function &tags_add_tags_support(&$param) {
        global $edited_post_tags, $wpdb, $WP_TAGS_ITEMS, $post_ID;
        $request = "SELECT * FROM $WP_TAGS_ITEMS WHERE post_id=$post_ID";
        $rows = $wpdb->get_results($request);
        if(count($rows)==0) {
                $edited_post_tags = "";
                return $param;
        }

        $edited_post_tags = array();
        for($i=0; $i<count($rows); $i++)
                $edited_post_tags[] = $rows[$i]->tag_name;
        $edited_post_tags = array_unique($edited_post_tags);
        $edited_post_tags = join( ' ', $edited_post_tags );

        return $param;
}

function tags_save_post($post_ID) {
        global $wpdb, $WP_TAGS_ITEMS, $WP_TAGS;
        $tags = rawurldecode($tags);
        $tags = trim($_POST['post_tags']);
        $tags = preg_split('/( )+/', $tags);
        $tags = array_unique($tags);
        $tags = array_filter( $tags, tags_empty_check );
        
        $request = "DELETE FROM $WP_TAGS_ITEMS WHERE post_id=$post_ID";
        $wpdb->query($request);
        
        if(count($tags)==0)
                return;

        foreach($tags as $tag) {
                $tag = addslashes(strtolower($tag));
                $request = "INSERT INTO $WP_TAGS_ITEMS (post_id, tag_name) VALUES ($post_ID,'$tag')";
                $wpdb->query($request);
        }
}

function tags_shutdown(&$param) {
        global $_tags;
        unset($_tags);
}

function &tags_filter_query_vars(&$query_vars) {
        $query_vars[] = 'tags';
        return $query_vars;
}

function tags_empty_check(&$elem) {
        return !empty($elem);
}

function &tags_filter_posts_join(&$join) {
        global $_tags, $WP_TAGS_ITEMS, $WP_TAGS, $wpdb;

        $_tags = array_filter( $_tags, tags_empty_check );
        // if no tag is specified, return
        if(count($_tags)==0)
                return $join;

        $join .= " ";
        $join .= "JOIN $WP_TAGS_ITEMS ON ($wpdb->posts.ID=$WP_TAGS_ITEMS.post_id AND ( 0";
        foreach($_tags as $tag) {
                $tag = addslashes($tag);
                $join .= " OR $WP_TAGS_ITEMS.tag_name='$tag'";
        }
        $join .= ")) ";
        
        return $join;
}

function &tags_filter_posts_where(&$where) {
        global $_tags, $WP_TAGS_ITEMS, $WP_TAGS, $wpdb;
        
        $_tags = array_filter( $_tags, tags_empty_check );
        $num_tags = count($_tags);
        if($num_tags == 0)
                return $where;
        
        $where .= " ";
        return $where;
}

function &tags_filter_the_posts(&$the_posts) {
        global $_tags, $WP_TAGS_ITEMS, $WP_TAGS, $wpdb;
        
        $_tags = array_filter( $_tags, tags_empty_check );
        $num_tags = count($_tags);
        
        if($num_tags == 0)
                return $the_posts;

        foreach($the_posts as $key=>$post) {
                $post_id = $post->ID;
                $request = "SELECT DISTINCT COUNT(*) AS c FROM $WP_TAGS_ITEMS WHERE post_id='$post_id' AND (0";
                foreach($_tags as $tag) {
                        $tag = addslashes($tag);
                        $request .= " OR tag_name='$tag'";
                }
                $request .= ")";
                $rows = $wpdb->get_results($request);

                if(count($rows)==0)
                        continue;

                $post_count = intval($rows[0]->c);
                if($post_count < $num_tags) {
                        unset($the_posts[$key]);
                }
        }
        
        if(count($the_posts)>0)
                array_unshift( $the_posts, array_shift($the_posts) );
        return $the_posts;
}

function &tags_filter_rewrite_rules_array(&$rules) {
        $work["tags/?$"] = 'index.php?&tags=';
        $work["tags/([^/]+)/?$"] = 'index.php?&tags=$1';
        $work["tags/([^/]+)/([0-9]{4})/?$"] = 'index.php?year=$2&tags=$1';
        $work["tags/([^/]+)/([0-9]{4})/([0-9]{1,2})/?$"] = 'index.php?year=$2&monthnum=$3&tags=$1';
        $work["tags/([^/]+)/([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})/?$"] = 'index.php?year=$2&monthnum=$3&day=$4&tags=$1';
        $work["tags/([^/]+)/(feed|atom|rss|rss2|rdf)/?$"] = 'index.php?&tags=$1&feed=$2';
        $work["tags/([^/]+)/([0-9]{4})/(feed|atom|rss|rss2|rdf)/?$"] = 'index.php?year=$2&tags=$1&feed=$3';
        $work["tags/([^/]+)/([0-9]{4})/([0-9]{1,2})/(feed|atom|rss|rss2|rdf)/?$"] = 'index.php?year=$2&monthnum=$3&tags=$1&feed=$4';
        $work["tags/([^/]+)/([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})/(feed|atom|rss|rss2|rdf)/?$"] = 'index.php?year=$2&monthnum=$3&day=$4&tags=$1&feed=$5';
        $work["tags/([^/]+)/page/?([0-9]{1,})/?$"] = 'index.php?&tags=$1&paged=$2';
        $work["tags/([^/]+)/([0-9]{4})/page/?([0-9]{1,})/?$"] = 'index.php?year=$2&tags=$1&paged=$3';
        $i = 0;
        foreach($rules as $key => $value) {
                if( ctype_alpha($key[0]) || ctype_digit($key[0]) )  break;
                $i++;
        }
        $temp = array_splice($rules, $i);
        $rules = array_merge( $rules, $work, $temp);
        return $rules;
}

function tags_delete_post($post_ID) {
        global $WP_TAGS_ITEMS, $wpdb;

        $request = "DELETE FROM $WP_TAGS_ITEMS WHERE post_id=$post_ID";
        $wpdb->query($request);
}

add_action('admin_menu', 'tags_add_menu');
add_action('parse_query', 'tags_parse_query');
add_action('shutdown', 'tags_shutdown');
add_action('edit_post', 'tags_save_post');
add_action('save_post', 'tags_save_post');
add_action('delete_post', 'tags_delete_post');

add_filter('query_vars', 'tags_filter_query_vars');
add_filter('posts_join', 'tags_filter_posts_join');
add_filter('posts_where', 'tags_filter_posts_where');
add_filter('the_posts', 'tags_filter_the_posts');
add_filter('rewrite_rules_array', 'tags_filter_rewrite_rules_array');
add_filter('content_edit_pre', 'tags_add_tags_support');


$WP_TAGS_ITEMS = $table_prefix . "tags_items";
$_tags = array();


/*****
                    GNU GENERAL PUBLIC LICENSE
                       Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
                       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

                            Preamble

  The licenses for most software are designed to take away your
freedom to share and change it.  By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users.  This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it.  (Some other Free Software Foundation software is covered by
the GNU Library General Public License instead.)  You can apply it to
your programs, too.

  When we speak of free software, we are referring to freedom, not
price.  Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
in new free programs; and that you know you can do these things.

  To protect your rights, we need to make restrictions that forbid
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These restrictions translate to certain responsibilities for you if you
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  For example, if you distribute copies of such a program, whether
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  We protect your rights with two steps: (1) copyright the software, and
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  Also, for each author's protection and ours, we want to make certain
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  Finally, any free program is threatened constantly by software
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program proprietary.  To prevent this, we have made it clear that any
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  The precise terms and conditions for copying, distribution and
modification follow.

                    GNU GENERAL PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. This License applies to any program or other work which contains
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                            NO WARRANTY

  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
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                     END OF TERMS AND CONDITIONS
*/
?>