Formatter: Graphviz Visualisation

<?php

// WackoWiki Formatter to display graphviz-graphs
// https://wackowiki.org/doc/Dev/PatchesHacks/GraphvizVisualisation

// ported to WackoWiki 5.1.0 by varaha@zaporogom.info 2012/08/27
// ported to WackoWiki 5.5 2019/06/20 - untested
// ported to WackoWiki 6.1 2022/02/05 - untested

// if set to "" we test is the file in PATH
$gv_settings['bindir']    = '';
$gv_settings['filedir']    = UPLOAD_LOCAL_DIR;

// check, if there should be another tool than dot used
if (isset($options['neato']))        $bin = 'neato';
else if (isset($options['circo']))    $bin = 'circo';
else if (isset($options['twopi']))    $bin = 'twopi';
else if (isset($options['fdp']))    $bin = 'sfdp';
else if (isset($options['sfdp']))    $bin = 'sfdp';
else if (isset($options['osage']))    $bin = 'osage';
else                                $bin = 'dot';

$gv_settings['bin'] = $gv_settings['bindir'] . $bin;

// write graphviz code to temporary text-file
$tmpname    = tempnam ($gv_settings['filedir'], 'temp');
$tmpfile    = fopen($tmpname, 'w');

fwrite($tmpfile, $text);
fclose($tmpfile);
#$mime_type    = mime_content_type($src);

// check who u are, can u upload?
if ($user = $this->get_user())
{
    $user_id    = $user['user_id'];
}
else
{
    $user_id    = 0;
}

// check user and upload access
if(!$this->check_acl($user, $this->db->upload))
{
    echo $this->_t('UploadForbidden');
}
else
{
    ### here starts the big code block ###

    // step 1: convert the source-code to generated source code
    $cmd    = $gv_settings['bin'] . " -Tdot -o$tmpname.dot $tmpname 2>&1";
    $cmdOut    = `{$cmd}`;

    if ($cmdOut != '')
    {
        echo '<i>' . $cmdOut . '</i><br/>';
        unlink($tmpname);
    }
    else
    {
        // extract the name of the graph (second string in first line)
        $gname        = file ("$tmpname.dot");
        $gname        = explode(' ', $gname[0]);
        $gname        = strtolower($gname[1]);
        // the basename is generated in the same way like the upload-handler do this
        $fname        = $gv_settings['filedir'] . '/@' . $this->get_page_id() . '@' . $gname;

        // step 2: prepare and run the image command and put the image in the upload dir and database
        $imagecmd    = $gv_settings['bin'] . ' -Tpng -o $fname.png $tmpname.dot';
        $cmdOut        = `{$imagecmd}`;

        // delelte dublicate images
        if (count($this->db->load_single(
            "SELECT upload_id " .
            "FROM " . $this->db->table_prefix . "file " .
            "WHERE page_id        = " . (int) $this->get_page_id() . " " .
            "AND file_name        = " . $this->db->q($gname . '.png') . "")) > 0)
        {
            $this->db->sql_query(
                "DELETE FROM " . $this->db->table_prefix . "file " .
                "WHERE page_id        = " . (int) $this->get_page_id() . " " .
                "AND file_name        = " . $this->db->q($gname . '.png'));
        }

        $imgurl        = $this->db->base_path . $this->page['tag'] . '/file?get=' . $gname . '.png';
        $imagesize    = getimagesize ($fname . '.png');

        $this->db->sql_query(
            "INSERT INTO " . $this->db->table_prefix . "file SET " .
                "page_id            = " . (int) $this->get_page_id() . ", " .
                "user_id            = " . (int) $user_id . ", " .
                "file_name            = " . $this->db->q($gname . '.png') ."', " .
                "file_lang            = " . $this->db->q($this->page_lang) . ", " .
                "file_description    = " . $this->db->q($bin . 'created image (' . date('Y-m-d H:i:s') . ' ' . $imagesize[0] . 'x' . $imagesize[1] . ')' ) . ", " .
                "file_size            = " . (int) filesize($fname . '.png') . ", " .
                "picture_w            = " . (int) $imagesize[0] . ", " .
                "picture_h            = " . (int) $imagesize[1] . ", " .
                "file_ext            = " . $this->db->q('png') . ", ".
                "mime_type            = " . $this->db->q($mime_type) . "," .
                "created            = UTC_TIMESTAMP(), " .
                "modified            = UTC_TIMESTAMP()");

        // step 3: prepare and run the map command
        $mapcmd        = $gv_settings['bin'] . " -Tcmap $tmpname.dot";
        $map        = `{$mapcmd}`;

        if ($map != '')
        {
            $map = iconv('utf-8', $this->get_charset(), $map);

            // output with image map
            echo '<map name="' . $gname . '">' . $map . '</map>';
        }

        echo '<img border="0" usemap="#' . $gname . '" ' . $imagesize[3] . ' src="' . $imgurl . '">' . "\n";

        // clear the directory and vars
        unset($cmdOut); // maybe this can cause trouble if un-unsetted
        unlink($tmpname);
        unlink($tmpname . '.dot');
    }
} ### here ends the big code block ###
	

Documentation

How to

digraph demoGraph { uni [label="University of Leipzig", URL="http://www.uni-leipzig.de"] IMISE [URL="http://www.imise.uni-leipzig.de"] KKSL [URL="http://www.kksl.uni-leipzig.de"] uni -> IMISE uni -> KKSL }

Changelog

To Do

• Port to R6.0