moodle/mod/forum/post.php

<?php // $Id$

//  Edit and save a new post to a discussion

    require_once('../../config.php');
    require_once('lib.php');
    require_once('post_form.php');

    $reply = optional_param('reply', 0, PARAM_INT);
    $forum = optional_param('forum', 0, PARAM_INT);
    $edit = optional_param('edit', 0, PARAM_INT);
    $delete = optional_param('delete', 0, PARAM_INT);
    $prune = optional_param('prune', 0, PARAM_INT);
    $name = optional_param('name', '', PARAM_CLEAN);
    $confirm = optional_param('confirm', 0, PARAM_INT);


    $page_params=array('reply'=>$reply,
                        'forum'=>$forum,
                        'edit'=>$edit); //these page_params will be passed as hidden variables
                                    //later in the form.

    $sitecontext = get_context_instance(CONTEXT_SYSTEM);

    if (has_capability('moodle/legacy:guest', $sitecontext, NULL, false)) {

        $wwwroot = $CFG->wwwroot.'/login/index.php';
        if (!empty($CFG->loginhttps)) {
            $wwwroot = str_replace('http', 'https', $wwwroot);
        }

        if (!empty($forum)) {      // User is starting a new discussion in a forum
            if (! $forum = get_record('forum', 'id', $forum)) {
                error('The forum number was incorrect');
            }
        } else if (!empty($reply)) {      // User is writing a new reply
            if (! $parent = forum_get_post_full($reply)) {
                error('Parent post ID was incorrect');
            }
            if (! $discussion = get_record('forum_discussions', 'id', $parent->discussion)) {
                error('This post is not part of a discussion!');
            }
            if (! $forum = get_record('forum', 'id', $discussion->forum)) {
                error('The forum number was incorrect');
            }
        }
        if (! $course = get_record('course', 'id', $forum->course)) {
            error('The course number was incorrect');
        }

        if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $course->id)) { // For the logs
            error('Could not get the course module for the forum instance.');
        } else {
            $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
        }

        $strforums = get_string('modulenameplural', 'forum');
        if ($course->id != SITEID) {
            print_header($course->shortname, $course->fullname,
                 "<a href=\"../../course/view.php?id=$course->id\">$course->shortname</a> ->
                  <a href=\"../forum/index.php?id=$course->id\">$strforums</a> ->
                  <a href=\"view.php?f=$forum->id\">".format_string($forum->name, true)."</a>",
                  '', '', true, "", navmenu($course, $cm));
        } else {
            print_header($course->shortname, $course->fullname,
                 "<a href=\"../forum/index.php?id=$course->id\">$strforums</a> ->
                  <a href=\"view.php?f=$forum->id\">".format_string($forum->name)."</a>",
                  '', '', true, "", navmenu($course, $cm));
        }
        notice_yesno(get_string('noguestpost', 'forum').'<br /><br />'.get_string('liketologin'),
                     $wwwroot, $_SERVER['HTTP_REFERER']);
        print_footer($course);
        exit;
    }
    require_login(0, false);   // Script is useless unless they're logged in

    if (!empty($forum)) {      // User is starting a new discussion in a forum
        if (! $forum = get_record("forum", "id", $forum)) {
            error("The forum number was incorrect ($forum)");
        }
        if (! $course = get_record("course", "id", $forum->course)) {
            error("The course number was incorrect ($forum->course)");
        }
        $coursecontext = get_context_instance(CONTEXT_COURSE, $course->id);
        if (! forum_user_can_post_discussion($forum)) {
            if (has_capability('moodle/legacy:guest', $coursecontext, NULL, false)) {  // User is a guest here!
                $SESSION->wantsurl = $FULLME;
                $SESSION->enrolcancel = $_SERVER['HTTP_REFERER'];
                redirect($CFG->wwwroot.'/course/enrol.php?id='.$course->id, get_string('youneedtoenrol'));
            } else {
                print_error('nopostforum', 'forum');
            }
        }

        if ($cm = get_coursemodule_from_instance("forum", $forum->id, $course->id)) {
            if (!$cm->visible and !has_capability('moodle/course:viewhiddenactivities', $coursecontext)) {
                error(get_string("activityiscurrentlyhidden"));
            }
        }

        $SESSION->fromurl = $_SERVER["HTTP_REFERER"];


        // Load up the $post variable.

        $post->course = $course->id;
        $post->forum  = $forum->id;
        $post->discussion = 0;           // ie discussion # not defined yet
        $post->parent = 0;
        $post->subject = "";
        $post->userid = $USER->id;
        $post->message = "";

        $post->groupid = get_current_group($course->id);
        if ($post->groupid == 0) {
            $post->groupid = -1;
        }

        forum_set_return();

    } else if (!empty($reply)) {      // User is writing a new reply

        if (! $parent = forum_get_post_full($reply)) {
            error("Parent post ID was incorrect");
        }
        if (! $discussion = get_record("forum_discussions", "id", $parent->discussion)) {
            error("This post is not part of a discussion!");
        }
        if (! $forum = get_record("forum", "id", $discussion->forum)) {
            error("The forum number was incorrect ($discussion->forum)");
        }
        if (! $course = get_record("course", "id", $discussion->course)) {
            error("The course number was incorrect ($discussion->course)");
        }

        $coursecontext = get_context_instance(CONTEXT_COURSE, $course->id);
        if (! forum_user_can_post($forum)) {
            if (has_capability('moodle/legacy:guest', $coursecontext, NULL, false)) {  // User is a guest here!
                $SESSION->wantsurl = $FULLME;
                $SESSION->enrolcancel = $_SERVER['HTTP_REFERER'];
                redirect($CFG->wwwroot.'/course/enrol.php?id='.$course->id, get_string('youneedtoenrol'));
            } else {
                print_error('nopostforum', 'forum');
            }
        }

        if ($cm = get_coursemodule_from_instance("forum", $forum->id, $course->id)) {
            if (groupmode($course, $cm)) {   // Make sure user can post here
                $mygroupid = mygroupid($course->id);
                if (!((empty($mygroupid) and $discussion->groupid == -1) || (ismember($discussion->groupid)/*$mygroupid == $discussion->groupid*/))) {
                    error("Sorry, but you can not post in this discussion.");
                }
            }
            if (!$cm->visible and !has_capability('moodle/course:manageactivities', $coursecontext)) {
                error(get_string("activityiscurrentlyhidden"));
            }
        }

        // Load up the $post variable.

        $post->course  = $course->id;
        $post->forum  = $forum->id;
        $post->discussion  = $parent->discussion;
        $post->parent = $parent->id;
        $post->subject = $parent->subject;
        $post->userid = $USER->id;
        $post->message = "";

        $strre = get_string('re', 'forum');
        if (!(substr($post->subject, 0, strlen($strre)) == $strre)) {
            $post->subject = $strre.' '.$post->subject;
        }

        unset($SESSION->fromdiscussion);
    } else if (!empty($edit)) {  // User is editing their own post

        if (! $post = forum_get_post_full($edit)) {
            error("Post ID was incorrect");
        }
        if ($post->parent) {
            if (! $parent = forum_get_post_full($post->parent)) {
                error("Parent post ID was incorrect ($post->parent)");
            }
        }

        if (! $discussion = get_record("forum_discussions", "id", $post->discussion)) {
            error("This post is not part of a discussion! ($edit)");
        }
        if (! $forum = get_record("forum", "id", $discussion->forum)) {
            error("The forum number was incorrect ($discussion->forum)");
        }
        if (! $course = get_record("course", "id", $discussion->course)) {
            error("The course number was incorrect ($discussion->course)");
        }
        if (!$cm = get_coursemodule_from_instance("forum", $forum->id, $course->id)) {
            error('Could not get the course module for the forum instance.');
        } else {
            $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
        }
        if (!($forum->type == 'news' && !$post->parent && $discussion->timestart > time())) {
            if (((time() - $post->created) > $CFG->maxeditingtime) and
                        !has_capability('mod/forum:editanypost', $modcontext)) {
                error( get_string("maxtimehaspassed", "forum", format_time($CFG->maxeditingtime)) );
            }
        }
        if (($post->userid <> $USER->id) and
                    !has_capability('mod/forum:editanypost', $modcontext)) {
            error("You can't edit other people's posts!");
        }

        // Load up the $post variable.
        $post->edit = $edit;

        $post->course  = $course->id;
        $post->forum  = $forum->id;

        unset($SESSION->fromdiscussion);


    }else if (!empty($delete)) {  // User is deleting a post

        if (! $post = forum_get_post_full($delete)) {
            error("Post ID was incorrect");
        }
        if (! $discussion = get_record("forum_discussions", "id", $post->discussion)) {
            error("This post is not part of a discussion!");
        }
        if (! $forum = get_record("forum", "id", $discussion->forum)) {
            error("The forum number was incorrect ($discussion->forum)");
        }
        if (!$cm = get_coursemodule_from_instance("forum", $forum->id, $forum->course)) {
            error('Could not get the course module for the forum instance.');
        } else {
            $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
        }
        if ( !(($post->userid == $USER->id && has_capability('mod/forum:deleteownpost', $modcontext))
                    || has_capability('mod/forum:deleteanypost', $modcontext)) ) {
            error("You can't delete this post!");
        }
        if (!empty($forum->course)) {
            if ($course = get_record('course', 'id', $forum->course)) {
                if (!empty($course->lang)) {
                    $CFG->courselang = $course->lang;
                }
            }
        }


        $replycount = forum_count_replies($post);

        if (!empty($confirm)) {    // User has confirmed the delete

            if ($post->totalscore) {
                notice(get_string("couldnotdeleteratings", "forum"),
                        forum_go_back_to("discuss.php?d=$post->discussion"));

            } else if ($replycount && !has_capability('mod/forum:deleteanypost', $modcontext)) {
                error(get_string("couldnotdeletereplies", "forum"),
                        forum_go_back_to("discuss.php?d=$post->discussion"));

            } else {
                if (! $post->parent) {  // post is a discussion topic as well, so delete discussion
                    if ($forum->type == 'single') {
                        notice("Sorry, but you are not allowed to delete that discussion!",
                                forum_go_back_to("discuss.php?d=$post->discussion"));
                    }
                    forum_delete_discussion($discussion);

                    add_to_log($discussion->course, "forum", "delete discussion",
                               "view.php?id=$cm->id", "$forum->id", $cm->id);

                    redirect("view.php?f=$discussion->forum");

                } else if (forum_delete_post($post, has_capability('mod/forum:deleteanypost', $modcontext))) {

                    if ($forum->type == 'single') {
                        // Single discussion forums are an exception. We show
                        // the forum itself since it only has one discussion
                        // thread.
                        $discussionurl = "view.php?f=$forum->id";
                    } else {
                        $discussionurl = "discuss.php?d=$post->discussion";
                    }

                    add_to_log($discussion->course, "forum", "delete post", $discussionurl, "$post->id", $cm->id);

                    redirect(forum_go_back_to($discussionurl));
                } else {
                    error("An error occurred while deleting record $post->id");
                }
            }


        } else { // User just asked to delete something

            forum_set_return();

            if ($replycount) {
                if (!has_capability('mod/forum:deleteanypost', $modcontext)) {
                    error(get_string("couldnotdeletereplies", "forum"),
                          forum_go_back_to("discuss.php?d=$post->discussion"));
                }
                print_header();
                notice_yesno(get_string("deletesureplural", "forum", $replycount+1),
                             "post.php?delete=$delete&amp;confirm=$delete",
                             $_SERVER["HTTP_REFERER"]);

                forum_print_post($post, $course->id, $ownpost=false, $reply=false, $link=false);
                if (empty($post->edit)) {
                    if (forum_tp_can_track_forums($forum) && forum_tp_is_tracked($forum)) {
                        $user_read_array = forum_tp_get_discussion_read_records($USER->id, $discussion->id);
                    } else {
                        $user_read_array = array();
                    }
                    forum_print_posts_nested($post->id, $course->id, false, false, $user_read_array, $forum->id);
                }
            } else {
                print_header();
                notice_yesno(get_string("deletesure", "forum", $replycount),
                             "post.php?delete=$delete&amp;confirm=$delete",
                             $_SERVER["HTTP_REFERER"]);
                forum_print_post($post, $forum->course, $ownpost=false, $reply=false, $link=false);
            }

        }
        print_footer($course);
        die;


    } else if (!empty($prune)) {  // Pruning

        if (!$post = forum_get_post_full($prune)) {
            error("Post ID was incorrect");
        }
        if (!$discussion = get_record("forum_discussions", "id", $post->discussion)) {
            error("This post is not part of a discussion!");
        }
        if (!$forum = get_record("forum", "id", $discussion->forum)) {
            error("The forum number was incorrect ($discussion->forum)");
        }
        if ($forum->type == 'single') {
            error('Discussions from this forum cannot be split');
        }
        if (!$post->parent) {
            error('This is already the first post in the discussion');
        }
        if (!$cm = get_coursemodule_from_instance("forum", $forum->id, $forum->course)) { // For the logs
            error('Could not get the course module for the forum instance.');
        } else {
            $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
        }
        if (!has_capability('mod/forum:splitdiscussions', $modcontext)) {
            error("You can't split discussions!");
        }

        if (!empty($name)) {    // User has confirmed the prune

            $newdiscussion->course = $discussion->course;
            $newdiscussion->forum = $discussion->forum;
            $newdiscussion->name = $name;
            $newdiscussion->firstpost = $post->id;
            $newdiscussion->userid = $discussion->userid;
            $newdiscussion->groupid = $discussion->groupid;
            $newdiscussion->assessed = $discussion->assessed;
            $newdiscussion->usermodified = $post->userid;
            $newdiscussion->timestart = $discussion->timestart;
            $newdiscussion->timeend = $discussion->timeend;

            if (!$newid = insert_record('forum_discussions', $newdiscussion)) {
                error('Could not create new discussion');
            }

            $newpost->id = $post->id;
            $newpost->parent = 0;
            $newpost->subject = $name;

            if (!update_record("forum_posts", $newpost)) {
                error('Could not update the original post');
            }

            forum_change_discussionid($post->id, $newid);

            // update last post in each discussion
            forum_discussion_update_last_post($discussion->id);
            forum_discussion_update_last_post($newid);

            add_to_log($discussion->course, "forum", "prune post",
                           "discuss.php?d=$newid", "$post->id", $cm->id);

            redirect(forum_go_back_to("discuss.php?d=$newid"));

        } else { // User just asked to prune something

            $course = get_record('course', 'id', $forum->course);
            $strforums = get_string("modulenameplural", "forum");
            print_header_simple(format_string($discussion->name).": ".format_string($post->subject), "",
                         "<a href=\"../forum/index.php?id=$course->id\">$strforums</a> ->
                          <a href=\"view.php?f=$forum->id\">".format_string($forum->name, true)."</a> ->
                          <a href=\"discuss.php?d=$discussion->id\">".format_string($post->subject, true)."</a> -> ".
                          get_string("prune", "forum"), '', "", true, "", navmenu($course, $cm));

            print_heading(get_string('pruneheading', 'forum'));
            echo '<center>';

            include('prune.html');

            forum_print_post($post, $forum->course, $ownpost=false, $reply=false, $link=false);
            echo '</center>';
        }
        print_footer($course);
        die;
    } else {
        error("No operation specified");

    }

    if (!isset($coursecontext)) {
        // Has not yet been set by post.php.
        $coursecontext = get_context_instance(CONTEXT_COURSE, $forum->course);
    }

    $mform_post = new forum_post_form('post.php', compact('coursecontext', 'forum', 'post'));

    if ($fromform = $mform_post->data_submitted()) {


        if (!empty($course->lang)) {           // Override current language
            $CFG->courselang = $course->lang;
        }

        if (empty($SESSION->fromurl)) {
            $errordestination = "$CFG->wwwroot/mod/forum/view.php?f=$forum->id";
        } else {
            $errordestination = $SESSION->fromurl;
        }

        // TODO add attachment processing
        //$fromform->attachment = isset($_FILES['attachment']) ? $_FILES['attachment'] : NULL;

        if (!$cm = get_coursemodule_from_instance("forum", $forum->id, $course->id)) { // For the logs
            error('Could not get the course module for the forum instance.');
        }
        $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
        trusttext_after_edit($fromform->message, $modcontext);

        if ($fromform->edit) {           // Updating a post
            $fromform->id = $fromform->edit;
            $message = '';

            //fix for bug #4314
            if (!$realpost = get_record('forum_posts', 'id', $fromform->id)) {
                $realpost = new object;
                $realpost->userid = -1;
            }


            // if user has edit any post capability
            // or has either startnewdiscussion or reply capability and is editting own post
            // then he can proceed
            // MDL-7066
            if ( !(($realpost->userid == $USER->id && (has_capability('mod/forum:replypost', $modcontext)
                                || has_capability('mod/forum:startdiscussion', $modcontext))) ||
                                has_capability('mod/forum:editanypost', $modcontext)) ) {
                error("You can not update this post");
            }

            if ($forum->type == 'news' && !$fromform->parent) {
                $updatediscussion = new object;
                $updatediscussion->id = $fromform->discussion;
                if (empty($fromform->timestartdisabled)) {
                    $updatediscussion->timestart = $fromform->timestart;
                } else {
                    $updatediscussion->timestart = 0;
                }
                if (empty($fromform->timeenddisabled)) {
                    $updatediscussion->timeend = $fromform->timeend;
                } else {
                    $updatediscussion->timeend = 0;
                }

                if (!update_record('forum_discussions', $updatediscussion)) {
                    error(get_string("couldnotupdate", "forum"), $errordestination);
                }
            }

            $updatepost=$fromform; //realpost
            $updatepost->forum=$forum->id;
            if (!forum_update_post($updatepost, $message)) {
                error(get_string("couldnotupdate", "forum"), $errordestination);
            }

            $timemessage = 2;
            if (!empty($message)) { // if we're printing stuff about the file upload
                $timemessage = 4;
            }
            $message .= '<br />'.get_string("postupdated", "forum");

            if ($subscribemessage = forum_post_subscription($fromform)) {
                $timemessage = 4;
            }
            if ($forum->type == 'single') {
                // Single discussion forums are an exception. We show
                // the forum itself since it only has one discussion
                // thread.
                $discussionurl = "view.php?f=$forum->id";
            } else {
                $discussionurl = "discuss.php?d=$discussion->id#$fromform->id";
            }
            add_to_log($course->id, "forum", "update post",
                    "$discussionurl&amp;parent=$fromform->id", "$fromform->id", $cm->id);

            redirect(forum_go_back_to("$discussionurl"), $message.$subscribemessage, $timemessage);

            exit;


        } else if ($fromform->discussion) { // Adding a new post to an existing discussion
            $message = '';
            $addpost=$fromform;
            $addpost->forum=$forum->id;
            if ($fromform->id = forum_add_new_post($addpost, $message)) {

                $timemessage = 2;
                if (!empty($message)) { // if we're printing stuff about the file upload
                    $timemessage = 4;
                }
                $message .= '<br />'.get_string("postadded", "forum", format_time($CFG->maxeditingtime));

                if ($subscribemessage = forum_post_subscription($fromform)) {
                    $timemessage = 4;
                }

                if (!empty($fromform->mailnow)) {
                    $message .= get_string("postmailnow", "forum");
                    $timemessage = 4;
                }

                if ($forum->type == 'single') {
                    // Single discussion forums are an exception. We show
                    // the forum itself since it only has one discussion
                    // thread.
                    $discussionurl = "view.php?f=$forum->id";
                } else {
                    $discussionurl = "discuss.php?d=$discussion->id";
                }
                add_to_log($course->id, "forum", "add post",
                          "$discussionurl&amp;parent=$fromform->id", "$fromform->id", $cm->id);

                redirect(forum_go_back_to("$discussionurl#$fromform->id"), $message.$subscribemessage, $timemessage);

            } else {
                error(get_string("couldnotadd", "forum"), $errordestination);
            }
            exit;

        } else {                     // Adding a new discussion
            $fromform->mailnow = empty($fromform->mailnow) ? 0 : 1;
            $discussion = $fromform;
            $discussion->name  = $fromform->subject;
            $discussion->intro = $fromform->message;
            $newstopic = false;

            if ($forum->type == 'news' && !$fromform->parent) {
                $newstopic = true;
            }
            if ($newstopic && empty($fromform->timestartdisabled)) {
                $discussion->timestart = $fromform->timestart;
            } else {
                $discussion->timestart = 0;
            }
            if ($newstopic && empty($fromform->timeenddisabled)) {
                $discussion->timeend = $fromform->timeend;
            } else {
                $discussion->timeend = 0;
            }

            $message = '';
            if ($discussion->id = forum_add_discussion($discussion, $message)) {

                add_to_log($course->id, "forum", "add discussion",
                        "discuss.php?d=$discussion->id", "$discussion->id", $cm->id);

                $timemessage = 2;
                if (!empty($message)) { // if we're printing stuff about the file upload
                    $timemessage = 4;
                }
                $message .= '<br />'.get_string("postadded", "forum", format_time($CFG->maxeditingtime));

                if ($fromform->mailnow) {
                    $message .= get_string("postmailnow", "forum");
                    $timemessage = 4;
                }

                if ($subscribemessage = forum_post_subscription($discussion)) {
                    $timemessage = 4;
                }

                redirect(forum_go_back_to("view.php?f=$fromform->forum"), $message.$subscribemessage, $timemessage);

            } else {
                error(get_string("couldnotadd", "forum"), $errordestination);
            }

            exit;
        }
    }



    // To get here they need to edit a post, and the $post
    // variable will be loaded with all the particulars,
    // so bring up the form.

    // $course, $forum are defined.  $discussion is for edit and reply only.

    $cm = get_coursemodule_from_instance("forum", $forum->id, $course->id);

    require_login($course->id, false, $cm);

    $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);

    if ($post->discussion) {
        if (! $toppost = get_record("forum_posts", "discussion", $post->discussion, "parent", 0)) {
            error("Could not find top parent of post $post->id");
        }
    } else {
        $toppost->subject = ($forum->type == "news") ? get_string("addanewtopic", "forum") :
                                                       get_string("addanewdiscussion", "forum");
    }



    if ($post->parent) {
        $navtail = ' -> <a href="discuss.php?d='.$discussion->id.'">'.format_string($toppost->subject, true).'</a> -> '.
                    get_string('editing', 'forum');
    } else {
        $navtail = ' -> '.format_string($toppost->subject);
    }

    if (empty($post->edit)) {
        $post->edit = '';
    }

    $strforums = get_string("modulenameplural", "forum");


    $navmiddle = "<a href=\"../forum/index.php?id=$course->id\">$strforums</a> -> <a href=\"view.php?f=$forum->id\">".format_string($forum->name, true).'</a> ';

    if (empty($discussion->name)) {
        if (empty($discussion)) {
            $discussion = new object;
        }
        $discussion->name = $forum->name;
    }
    if ($forum->type == 'single') {
        // There is only one discussion thread for this forum type. We should
        // not show the discussion name (same as forum name in this case) in
        // the breadcrumbs.
        $strdiscussionname = '';
        $navtail = '';
    } else {
        // Show the discussion name in the breadcrumbs.
        $strdiscussionname = format_string($discussion->name).':';
    }
    if ($course->id != SITEID) {
        print_header("$course->shortname: $strdiscussionname ".
                      format_string($toppost->subject), "$course->fullname",
                     "<a href=\"../../course/view.php?id=$course->id\">$course->shortname</a> ->
                      $navmiddle $navtail", $mform_post->focus(), "", true, "", navmenu($course, $cm));

    } else {
        print_header("$course->shortname: $strdiscussionname ".
                      format_string($toppost->subject), "$course->fullname",
                     "$navmiddle $navtail", $mform_post->focus(), "", true, "", navmenu($course, $cm));

    }

// checkup
    if (!empty($parent) && !forum_user_can_see_post($forum, $discussion, $post)) {
        error("You cannot reply to this post");
    }
    if (empty($parent) && !forum_user_can_post_discussion($forum)) {
        error("You cannot start a new discussion in this forum");
    }

    if ($forum->type == 'qanda' && !has_capability('mod/forum:viewqandawithoutposting', $modcontext) &&
                !forum_user_has_posted($forum->id, $discussion->id, $USER->id)) {
        notify(get_string('qandanotify', 'forum'));
    }

    forum_check_throttling($forum);

    if (!empty($parent)) {
        forum_print_post($parent, $course->id, $ownpost=false, $reply=false, $link=false);
        if (empty($post->edit)) {
            if (forum_tp_can_track_forums($forum) && forum_tp_is_tracked($forum)) {
                $user_read_array = forum_tp_get_discussion_read_records($USER->id, $discussion->id);
            } else {
                $user_read_array = array();
            }
            if ($forum->type != 'qanda' || forum_user_can_see_discussion($forum, $discussion, $modcontext)) {
                forum_print_posts_threaded($parent->id, $course->id, 0, false, false, $user_read_array, $discussion->forum);
            }
        }
        $heading=get_string("yourreply", "forum");
    } else {
        $forum->intro = trim($forum->intro);
        if (!empty($forum->intro)) {
            print_simple_box(format_text($forum->intro), 'center');
        }
        if ($forum->type == 'qanda') {
            $heading=get_string('yournewquestion', 'forum');
        } else {
            $heading=get_string('yournewtopic', 'forum');
        }
    }

    if ($USER->id != $post->userid) {   // Not the original author, so add a message to the end
        $data->date = userdate($post->modified);
        if ($post->format == FORMAT_HTML) {
            $data->name = '<a href="'.$CFG->wwwroot.'/user/view.php?id='.$USER->id.'&course='.$post->course.'">'.
                           fullname($USER).'</a>';
            $post->message .= '<p>(<span class="edited">'.get_string('editedby', 'forum', $data).'</span>)</p>';
        } else {
            $data->name = fullname($USER);
            $post->message .= "\n\n(".get_string('editedby', 'forum', $data).')';
        }
    }

    //load data into form
    $subscribe=(isset($post->forum)&&forum_is_subscribed($USER->id, $post->forum)) ||
                    (!empty($USER->autosubscribe));


    trusttext_prepare_edit($post->message, $post->format, can_use_html_editor(), $modcontext);

    $mform_post->set_defaults(array(    'general'=>$heading,
                                        'subject'=>$post->subject,
                                        'message'=>$post->message,
                                        'subscribe'=>$subscribe?1:0,
                                        'mailnow'=>!empty($post->mailnow),
                                        'userid'=>$post->userid,
                                        'parent'=>$post->parent,
                                        'discussion'=>$post->discussion,
                                        'course'=>$course->id)+

                                        $page_params+

                                (isset($post->format)?array(
                                        'format'=>$post->format):
                                    array())+

                                (isset($post->groupid)?array(
                                        'groupid'=>$post->groupid):
                                    array())+

                                (isset($discussion->timestart)?
                                        array('timestart'=>$discussion->timestart):
                                        array('timestart'=>0))+

                                (isset($discussion->timeend)?
                                        array('timeend'=>$discussion->timeend):
                                        array('timeend'=>0))+

                                (isset($discussion->timestartdisabled)?
                                        array('timestartdisabled'=>$discussion->timestartdisabled):
                                        array('timestartdisabled'=>1))+

                                (isset($discussion->timeenddisabled)?
                                        array('timeenddisabled'=>$discussion->timeenddisabled):
                                        array('timeenddisabled'=>1))+

                                (isset($discussion->id)?
                                        array('discussion'=>$discussion->id):
                                        array()));


    $mform_post->display();


    print_footer($course);


?>