⌈⌋ branch:  freshcode


Check-in [108362e99b]

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Overview
SHA1 Hash:108362e99b840518ae63379697a48dab9c2df071
Date: 2014-08-11 16:13:43
User: mario
Comment:Add basic /meta forum, separate handler and database structure.
Tags And Properties
  • branch=trunk inherited from [82405bb421]
  • sym-trunk inherited from [82405bb421]
Context
2014-08-11
16:15
[23550cee89] Use non-autoupdating autoloader. (user: mario, tags: trunk, 0.6.5)
16:13
[108362e99b] Add basic /meta forum, separate handler and database structure. (user: mario, tags: trunk)
16:12
[7b214ee870] Split Browser Projects by Tag into /names and /tags links. (user: mario, tags: trunk)
Changes

Changes to .htaccess.

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RewriteRule  ^projects/([\w-_]+)/releases/(\w+)\.json$  index.php?page=api&name=$1&api=version_%1&id=$2 [L,NS,QSA]
RewriteCond  %{REQUEST_METHOD}  ^(GET|PUT|POST|PUSH)$
RewriteRule  ^projects/([\w-_]+)/urls\.json$  index.php?page=api&name=$1&api=urls [L,NS,QSA] 


#-- Page dispatching
RewriteRule  ^$                 index.php?page=index    [L,NS,QSA]
RewriteRule  ^(projects|submit|search|flag|names?|tags?|feed|login|links|forum|rc|admin|drchangelog)\b/?(\w+(?:[-_]\w+)*)?(?:\.(json|atom|rss))?/?$   index.php?page=$1&name=$2&ext=$3   [L,NS,QSA]


#-- Deny direct invocations
RewriteRule  ^freshcode\.db.*$  -                       [F]
RewriteRule  ^\.                -                       [F]
RewriteCond  %{ENV:REDIRECT_STATUS}  !200
RewriteRule  ^\w+\.php(|/.*)$   -                       [F,L,NS]









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RewriteRule  ^projects/([\w-_]+)/releases/(\w+)\.json$  index.php?page=api&name=$1&api=version_%1&id=$2 [L,NS,QSA]
RewriteCond  %{REQUEST_METHOD}  ^(GET|PUT|POST|PUSH)$
RewriteRule  ^projects/([\w-_]+)/urls\.json$  index.php?page=api&name=$1&api=urls [L,NS,QSA] 


#-- Page dispatching
RewriteRule  ^$                 index.php?page=index    [L,NS,QSA]
RewriteRule  ^(projects|submit|search|flag|names?|tags?|feed|login|links|rc|admin|drchangelog)\b/?(\w+(?:[-_]\w+)*)?(?:\.(json|atom|rss))?/?$   index.php?page=$1&name=$2&ext=$3   [L,NS,QSA]
RewriteRule  ^(forum|meta)\b/?(\w+)?/?$   page_forum.php?name=$2   [L,NS,QSA]

#-- Deny direct invocations
RewriteRule  ^freshcode\.db.*$  -                       [F]
RewriteRule  ^\.                -                       [F]
RewriteCond  %{ENV:REDIRECT_STATUS}  !200
RewriteRule  ^\w+\.php(|/.*)$   -                       [F,L,NS]


Added forum.css.













































































































































































































































































































































































































































































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/**
 * api: css
 * type: stylesheet
 * title: meta forum layout
 * description: Minimalistic forum style
 * version: 0.1
 *
 * Posts are just presented in a nested list,
 * and left-side title banner sticks out.
 *
 */


/**
 * Google fonts
 *
 */
@import url(http://fonts.googleapis.com/css?family=Hind:400,500,700,300);

/**
 * General
 *
 */
html, body { padding: 0; margin: 0; height: 100%; }
body {
/* font: 400 12pt/16pt Kreon;/
   font: 500 12pt/16pt Raleway;
   font: 500 12pt/16pt Numans;
   font: 500 12pt/16pt Inder;
   font: 400 12pt/16pt Voces;
   font: 400 12pt/16pt Magra;*/
   font: 400 12pt/16pt Hind;
}

/**
 * Title border
 *
 */
#title {
   display: block;
   position: fixed;
   left: 0;
   top: 0;
   background: #222;
   width: 150pt;
   float: left;
   height: 100%;
   min-height: 5000px;
   padding: 0;  margin: 0;
}
h1 {
   transform: rotate(270deg);
   color: #fff;
   font-size: 72pt;
   position: relative;
   top: 400pt;
   white-space: nowrap;
   letter-spacing: -0.025em;
}
h1 { font-weight: 300; }
h1 b { font-weight: 700; }
h1 .red { color: #744; }
h1 .grey { color: #444; }

/**
 * Forum tree
 *
 */
.forum, .forum ul {
   padding: 5pt 0 0 30pt;
   list-style: none;
}
ul.forum {
   padding: 5pt;
   padding-left: 180pt;
   list-style: none;
   padding-bottom: 90pt;
}

/**
 * One post block (wrapped in <li>)
 *
 */
.forum .entry {
   display: block;
   width: 600pt;
/*   background: #eee;
   border: 1px solid #ddd; */
   min-height: 30pt;
   padding-left: 5pt;
   margin-top: 15pt;
}

/**
 * Tag / author / time - left-rotated meta info.
 *
 */
.forum .entry .meta {
}
.forum .entry .meta div {
   /* border: 2px dashed #faa; */
}
.forum .entry .meta div > * {
   font-size: 90%;
   line-height: 90%;
   color: #666;
   padding-right: 5pt;
}
.forum .entry .meta .datetime {
   font-size: 5pt;
   color: #ccc;
}
.forum .entry .meta .category {
   color: #85879f;
   background: #fcf9f1;
   border-radius: 3pt;
   font-size: 105%;
   letter-spacing: 0.1em;
}


/**
 * Post content.
 *
 */
.forum .entry .summary {
   display: block;
   margin: 0;
   font-weight: bold;
   font-size: 108%;
   color: #449;
}
.forum .entry .excerpt {
   color: #777;
}
.forum .entry .excerpt.trimmed {
   display: none;
}
.forum .entry .content.trimmed {
   display: none;
}
.forum .entry .funcs.trimmed {
   opacity: 0.1;
}
.forum .entry .content p {
   padding-top: 0; margin-top: 0;
}

label {
   display: block;
   padding: 5pt;
}

.action {
   margin: 1pt;
   padding: 2pt 10pt;
   color: #33c;
   background: #e7e7fc;
   border: #f0f0f9;
   border-radius: 5pt;
   font-size: 10pt;
   opacity: 0.85;
   cursor: pointer;
}
.action.forum-edit {
   opacity: 0.5;
}
.action:hover {
   opacity: 1.0;
}
.action.forum-edit:hover {
   cursor: s-resize;
}
.action.forum-reply:hover {
   cursor: copy;
}


/**
 * Submit form
 *
 */
form.forum-submit label b {
   display: inline-block;
   width: 80pt;
   text-align: right;
}
form.forum-submit label b select {
   font-weight: 900;
   font-size: 105%;
   text-align: right;
}

form.forum-submit .markup-buttons {
   width: 80pt;
   padding: 5pt;
   text-align: right;
   position: relative;
}
.markup-buttons .action {
   display: inline-block;
   margin: 0 10pt 7pt 0;
   cursor: text;
   padding: 3pt 15pt 1pt 15pt;
   line-height: 1em;
   background: #eef0f7;
   opacity: 0.3;
}
.markup-buttons .action:hover {
   opacity: 1.0;
}

.error, .warning {
   background: #eeddaa;
   border: 2px solid #ddcc99;
   border-radius: 5pt;
   padding: 5pt;
}
.error {
   background: #eebbaa;
}


input, textarea, select {
   font-size: 105%;
   padding: 1.5pt;
   border: 1px solid #bbb;
   border-left: 5pt solid #ccc;
   border-radius: 5pt;
}

Changes to gimmicks.js.

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        // editing
        if (func == "forum-edit") {
            $target.load("/forum/edit", { "id": id });
        }
        // submit
        if (func == "forum-submit"){
            $target = $target.parent();
            $.post("/forum/submit", $target.serialize(), function(html){
                $target.html(html);
            });
        }
        event.preventDefault();
    });

















});













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        // editing
        if (func == "forum-edit") {
            $target.load("/forum/edit", { "id": id });
        }
        // submit
        if (func == "forum-submit"){
            $target = $target.parent();
            $.post("/forum/submit", $target.find("form").serialize(), function(html){
                $target.html(html);
            });
        }
        event.preventDefault();
    });

    // Markup
    $(".forum").delegate(".action.markup", "click", function(){
        var $ta = $(this).parent().parent().parent().find("textarea");
        var content = $ta.val();
        var x = $ta[0].selectionStart;
        var y = $ta[0].selectionEnd;
        var before = $(this).data("before");
        var after = $(this).data("after");
        if (y) {
            $ta.val(content.substr(0, x) + before + content.substr(x, y-x) + after + content.substr(y, content.length - y));
        }
        else {
            $ta.val(content + before + "..." + after);
        }
    });

});






Changes to index.php.

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<?php
/**
 * api: php

 * title: Freshcode.club
 * description: FLOSS software release tracking website
 * version: 0.6.0
 * author: mario
 * license: AGPL
 * 
 * Implements a freshmeat/freecode-like directory for open source
 * release publishing / tracking.
 *
 */
................................................................................
#-- init
include("config.php");


#-- dispatch
switch ($page = $_GET->id["page"]) {




    case "index":
    case "projects":
    case "feed":
    case "forum":
    case "links":
    case "tags":
    case "names":
    case "search":
    case "rc":
    case "drchangelog":
    case "login":
        include("page_$page.php");
        break;






    case "flag":
    case "submit":
        if ((LOGIN_REQUIRED or $page === "flag") and empty($_SESSION["openid"])) {
            exit(include("page_login.php"));
        }
        include("page_$page.php");



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<?php
/**
 * api: php
 * type: main
 * title: Freshcode.club
 * description: FLOSS software release tracking website
 * version: 0.6.5
 * author: mario
 * license: AGPL
 * 
 * Implements a freshmeat/freecode-like directory for open source
 * release publishing / tracking.
 *
 */
................................................................................
#-- init
include("config.php");


#-- dispatch
switch ($page = $_GET->id["page"]) {

    case "name":
    case "names":
        $page = "names";
    case "index":
    case "projects":
    case "feed":

    case "links":
    case "tags":

    case "search":
    case "rc":
    case "drchangelog":
    case "login":
        include("page_$page.php");
        break;

    case "forum":
    case "meta":
        include("page_forum.php");
        break;

    case "flag":
    case "submit":
        if ((LOGIN_REQUIRED or $page === "flag") and empty($_SESSION["openid"])) {
            exit(include("page_login.php"));
        }
        include("page_$page.php");

Added lib/forum.php.























































































































































































































































































































































































































































































































































































































































































































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<?php
/**
 * api: php
 * type: handler
 * title: Follow The Thread
 * description: Straightforward threaded discussion forum
 * version: 0.2
 * category: discussion
 * depends: HTMLPurifier
 * config:
 *    <var name="forum_cfg[categories]" type="list" default="discussion,documentation" help="Comma-separated list of thread classifiers"/>
 *
 *
 * Implements a minimalistic web forum.
 * Primary goals are:
 *   → Threaded discussions in place of bulletin board blabber.
 *   → Contemporary security over restriction gimmicks.
 *   → Usability instead of UI featuritis.
 *   → Open access in lieu of accounteritis.
 *
 * Single table database:
 *    [id] INT PRIMARY KEY NOT NULL UNIQUE,
 *    [pid] INT NOT NULL DEFAULT(0) REFERENCES [forum] ([id]),
 *    [gid] INT NOT NULL REFERENCES [forum] ([id]),
 *    [tag] VARCHAR (0, 32) NOT NULL DEFAULT('discussion'),
 *    [summary] VARCHAR (0, 200) NOT NULL,
 *    [source] TEXT,
 *    [html] TEXT,
 *    [excerpt] TEXT,
 *    [author] VARCHAR (0, 80),
 *    [miniature] TEXT,
 *    [t_published] INT NOT NULL,
 *    [edit_token] VARCHAR (16, 64)
 *
 * Templating
 * Behaviour
 * Configuration
 *
 *
 *
 */


/**
 * Decorative classification/grouping of threads.
 *
 */
global $forum_cfg;
$forum_cfg["categories"] = "discussion,projects,announcement,code,documentation,autoupdate";



/**
 * Callbacks, dispatcher and handler.
 *
 */
class forum {


    /**
     * Can be set externally, depending on application logic.
     *
     */
    var $is_admin = 0;
    var $can_edit = 1;



    /**
     * NOP
     *
     */
    function __construct() {
    }


    /**
     * Show forum listing
     *
     */
    function index($page=0) {
    
        // Fetch thread groups (attached to root gid=0)
        $entries = db("
            SELECT *
              FROM forum
             WHERE gid
                IN ( SELECT id
                       FROM forum
                      WHERE pid = 0
                   ORDER BY t_published DESC
                      LIMIT 50
                     OFFSET ?*50 )
          ORDER BY gid DESC,
                   t_published ASC
        ", $page);
        
        // Iterate over groups
        $last = 0;
        $group = array();
        foreach ($entries as $e) {
            if ($e["gid"] != $last) {
                $this->show_thread($group);
                $group = array();
            }
            $group[] = $e;
            $last = $e["gid"];
        }
        $this->show_thread($group);
    }


    /**
     * Iterate over grouped entry list
     * and recursively output posts.
     *
     */
    function show_thread($group, $pid=0) {
    
        #-- find available parent ids
        $parents = array_column($group, "pid");
    
        #-- step throuh
        foreach ($group as $entry) {
        
            #-- show if associated
            if ($entry["pid"] == $pid) {
                $entry["miniature"] or $entry["miniature"] = "/img/user.png";
                include("template/forum_entry.php");
                
                #-- Nest its children
                if (in_array($entry["id"], $parents)) {
                    print "    <ul>\n";
                    $this->show_thread($group, $entry["id"]);
                    print "    </ul>\n";
                }

                print "       </li>\n";
            }
        }
    }

    
    
    /**
     * Load a single entry.
     *
     */
    function entry($id) {
    }



    /**
     * Accept POST input and populate new forum post.
     * Adds an reply if ?pid= is not zero.
     * Doubles as edit function if ?id= is present.
     *
     */
    function submit($INSERT="INSERT") {
    
        #-- Prepare some fields
        $data = array(
            "id" => NULL,
            "pid" => $_POST->int["pid"],
            "gid" => NULL,
            "author" => $_POST->text->length…30->html["author"],
            "miniature" => $_POST->text->length…200->html["image"],
            "tag" => $_POST->text->length…20->html["tag"],
            "summary" => $_POST->text->length…120->html["summary"],
            "source" => $_POST->nocontrol->length…12000["source"],
            "html" => "",
            "excerpt" => "",
            "t_published" => time(),
            "edit_token" => $this->edit_token(),
        );

        #-- Source to HTML
        $data = $this->prepare_output($data);
        
        #-- Reject too minor submisions
        if (strlen("$data[source]$data[summary]") < 100) {
            exit("<p class=warning>Your post was a little too coarse. Please elaborate to keep discussions going.</p>");
        }

        #-- Edit
        if ($id = $_POST->int["id"]) {
            $prev = $this->edit_keep($this->edit_entry($id));
            $data = array_merge($data, $prev);
            $INSERT = "REPLACE";
#            var_dump($INSERT, $data, $prev);
        }
        #-- Reply
        elseif ($data["pid"]) {
            $data["gid"] = $this->group_id($data["pid"]);
        }

        /**
         * Store entry
         *  → Find maximum ID
         *  → Use as new id, and group id if new
         *  → Else keep previous pid and gid/id
         *
         * $data and $ids are split up before, so the :? and ::
         * placeholders don't consume all fields.
         *
         */
        $ids = array_splice($data, 0, 3);  // extract id,pid,gid
        $ok = db("
            $INSERT INTO forum (id, pid, gid, :?)
            VALUES (
                IFNULL(:id, (SELECT IFNULL(MAX(id), 0) + 1 AS id FROM forum)),
                IFNULL(:pid, 0),
                COALESCE(:gid, :id, (SELECT IFNULL(MAX(id), 0) + 1 AS id FROM forum)),
                ::
            );
        ", $data, $data, $ids);
        
        #-- return rendered
        if ($ok) {
            $data["id"] = db()->lastInsertId();
            $data["pid"] = 0;
            $this->show_thread([$data], 0);
        }
    }


    #-- Editing timeout / permission
    function edit_permission($prev) {
        return
            $this->is_admin
        or
            $_COOKIE->name["edit_token"] == $prev["edit_token"]
        and
            $prev["t_published"] + 48*3600 > time();
    }


    #-- Retrieves or sets edit_token
    function edit_token() {
        if (empty($token = $_COOKIE->name["edit_token"])) {
            setcookie("edit_token", $token = sha1(serialize($_SERVER)), time()+7*24*3600);
        }
        return $token;
    }


    /**
     * Retrieve post entry, check edit permission, and/or set defaults
     *
     *  → For forum/edit requests fetches the existing post content.
     *  → Also checks editing permissions (token),
     *    or e.g. existing OpenID logon ($this->can_edit is set from main site).
     *
     */
    function edit_entry($id) {
        if ($prev = db("SELECT * FROM forum WHERE id=?", $id)->fetch()) {

            if (!$this->can_edit) {
                exit("<p class=warning>You aren't logged in on the main site. Please associate an OpenID account.</p>");
            }
            if (!$this->edit_permission($prev)) {
                exit("<p class=warning>Entry not editable. (The edit token does not match, or the article is too old for editing.)</p>");
            }
            
            return $prev;
        }
        exit("<p class=error>Post #$id does not exist.</p>");
    }

    
    #-- Unsets a few fields for replying.
    function edit_keep($prev) {
        $copy = array_flip(str_getcsv("id,pid,gid,miniature,t_published,edit_token"));
        return array_intersect_key($prev, $copy);
    }


    #-- Copy thread/group id from parent post etc.
    function group_id($parent_id) {
        if ($prev = db("SELECT gid FROM forum WHERE id = ?", $parent_id)) {
            return $prev->gid;
        }
        return 0;
    }    


    #-- Convert Markdown/BB source into HTML, create excerpt, prepare user avatar
    function prepare_output($data) {

        #-- Content
        define("HTMLPURIFIER_PREFIX", "phar://lib/htmlpurifier.phar/standalone/");
        $md = new Parsedown();
        $data["html"] = input::purify($md->parse($data["source"]));
        $data["excerpt"] = input::html(substr(strip_tags($data["html"]), 0, 320));
        
        #-- Author
        if (strlen($data["miniature"]) and $type = $_POST->in_array("img_type", "gravatar,identicon,monsterid,wavatar,retro"))
        {
            $data["miniature"] = "http://www.gravatar.com/avatar/"
                               . md5($data["miniature"])
                               . ".jpeg?s=16" . ($type == "gravatar" ? "" : "&d=$type");
        }
        return $data;
    }




    /**
     * Output submit <form>
     *
     *  → Provides a few blank fields.
     *  → Injects cookie defaults if fresh submission / not an edit.
     *  → Escapes previous content for edit_form() calls.
     *
     */
    function submit_form($pid=0, $id=0, $data=array()) {
        global $forum_cfg;

        extract(array_merge(
            array_fill_keys(str_getcsv("author,miniature,tag,summary,source"), ""),
            $data ? array() : $_COOKIE->list->text["author,miniature"],
            array_map("htmlspecialchars", $data)
        ));

        include("template/forum_submit_form.php");
    }


    /**
     * Show editing <form> instead with prefilled previous data.
     *
     *  → Retrieves previous post content, checks permissions at that.
     *  → Outputs edit form (replied for AJAX $.load() request)
     *
     */
    function edit_form($pid=0, $id=0) {
        $data = $this->edit_entry($id);
        $this->submit_form(0, 0, $data);
    }

}




Added page_forum.php.

































































































































































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<?php
/**
 * api: freshcode
 * type: main
 * title: meta/forum
 * description: Simple threaded discussion / documentation forum.
 * version: 0.2
 *
 * Distinct layout from main site and harbours its own dispatcher.
 * Editing/post features. CSS is melted in, as there's no subpaging.
 *
 */


#-- custom config
include_once("./shared.phar");  // autoloader
define("INPUT_QUIET", 1) and
include_once("lib/input.php");  // input filter
define("HTTP_HOST", $_SERVER->id["HTTP_HOST"]);
include_once("lib/deferred_openid_session.php");  // auth+session
include_once("aux.php");        // utility functions
include_once("config.local.php");
include_once("lib/db.php");     // database API
db(new PDO("sqlite:forum.db")); // separate storage


#-- set up forum handling
$f = new forum();
$f->is_admin = in_array($_SESSION["openid"], $moderator_ids);


#-- dispatch functions
switch ($name = $_GET->id["name"]) {

    case "submit":
        exit( $f->submit() );

    case "post":
        exit( $f->submit_form($_REQUEST->int["pid"], 0) );

    case "edit":
        exit( $f->edit_form(0, $_REQUEST->int["id"]) );

    case "index":
    case "":
    default:
        // handled below per default
}
   
?>
<!DOCTYPE html>
<html>
<head>
    <title>freshcode.club forum</title>
    <script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
    <script src=gimmicks.js></script>
    <meta charset=UTF-8>
    <?= "<style>\n"
      . file_get_contents("forum.css")
      . "</style>";
    ?>
</head>
<body>
<div id=title>
   <h1><b>fresh</b>(code)<b class=red>.</b><span class=grey>club</span></h1>
</div>
<br>
<ul class=forum>

   <li>
      <div class=entry>
         <a class="action forum-new" data-id=0>New Thread</a>
      </div>
   </li>
   <?php
      $f->index();
    ?>
</ul>
</body>
</html>

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<?php
/**
 * api: FTD
 * title: Single forum post
 * description:
 *
 */

$_ = "trim";

print <<<HTML

   <li>
      <article class=entry>

          <h6 class=summary>$entry[summary]
             <span class="funcs trimmed">
                <a class="action forum-edit" data-id=$entry[id] title="Edit">Ed</a>
                <a class="action forum-reply" data-id=$entry[id] title="Reply">Re</a>
             </span>
          </h6>

          <aside class=meta><div>
             <b class=category>$entry[tag]</b>
             <i class=author>
                 <img align=top src="$entry[miniature]" width=16 height=16>
                 $entry[author]
             </i>
             <var class=datetime>{$_(strftime("%Y-%m-%d - %H:%M",$entry["t_published"]))}</var>
          </div></aside>

          <div class="excerpt">$entry[excerpt]</div>
          <div class="content trimmed">$entry[html]</div>

      </article>

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<?php
/**
 * api: ftt
 * type: template
 * title: Post submit/edit form
 * description: Outputs input form for new / reply / editing forum posts.
 *
 *
 */


?>

<!-- faux -->
<form action=spex method=POST style="displaY: None">
   <input type="hidden" name="back" value="index" />
   <input type="hidden" name="mode" value="posting" />
   <input type="hidden" name="id" value="0" />
   <input type="hidden" name="posting_mode" value="0" />
   <input type="text" size="40" name="name" value="" maxlength="40">
   <input type="text" size="40" name="email" value="">
   <input type="text" size="40" name="homepage" value="">
   <input id="subject" type="text" size="50" name="subject" value="">
   <textarea cols="80" rows="21" name="comment"></textarea>
   <input type="submit" name="save_entry" value="OK - Submit" title="Save entry">
</form>

<!-- actual -->
<form class=forum-submit action=none style="display: run-in">

   <label>
       <b>Author</b>
       <input name=author placeholder=your-name size=50 value="<?=$author?>">
   </label>

   <label>
       <b><select name=img_type><option>gravatar<option>identicon<option>monsterid<option>wavatar<option>retro</select></b>
       <input name=image type=email placeholder="you@example.com" size=50 value="<?=$miniature?>">
   </label>

   <label>
       <b>Category</b>
       <select name=tag><?=form_select_options($forum_cfg["categories"], $tag)?></select>
   </label>

   <label>
       <b>Summary</b>
       <input name=summary placeholder="..." size=60 value="<?=$summary?>">
   </label>

   <label>
       <span style="position: absolute">
          <div class="markup-buttons">
           <a class="action markup" style="font-style: italic" data-before="*" data-after="*">italic</a>
           <a class="action markup" style="font-weight: bold" data-before="**" data-after="**">bold</a>
           <a class="action markup" style="text-decoration: underline" data-before="[" data-after="](http://example.org/)">link</a>
           <a class="action markup" style="" data-before="`" data-after="`">{code}</a>
           <a class="action markup" style="" data-before="\n  *  " data-after="">• list</a>
          </div>
       </span>
       <b>Message</b>
       <textarea name=source cols=55 rows=12><?=$source?></textarea>
   </label>

   <input type=hidden name=id value="<?=$id?>">
   <input type=hidden name=pid value="<?=$pid?>">

   <button class="action forum-submit">Follow The Thread</button>
   <br>

</form>