<?php if (!defined('PmWiki')) exit();
/*  A slight modification of the file "trails.php", which is
    Copyright 2002-2004 Patrick R. Michaud (pmichaud@pobox.com) and 
    which forms part of PmWiki; 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
    (at your option) any later version.  See pmwiki.php for full details.

    This script enables markup of the form <<|TrailPage|>> to be 
    used to build "trails" through wiki documents.

    The modification enables the markup <<(:pagelist ... :)>>, to build
    a trail from a pagelist directive, or to expand and include any 
    pagelist directive found on an index page for a normal WikiTrail. 

    This version should be downloaded to the cookbook folder.
    The original "trails.php" should be disabled, and this new one
    included by putting
       $EnableWikiTrails=0;
       include_once("cookbook/pagelisttrails.php");
    in the config.php file.

    Once enabled, the <<|TrailPage|>> markup is replaced with
    << PrevPage | TrailPage | NextPage >> on output.  TrailPage should
    contain either a bullet or number list defining the sequence of pages
    in the "trail".

    The ^|TrailPage|^ markup uses the depth of the bullets to display
    the ancestry of the TrailPage to the current one.  The <|TrailPage|> 
    markup is like <<|TrailPage|>> except that "< PrevPage |" and 
    "| NextPage >" are omitted if at the beginning or end of the 
    trail respectively.  Thanks to John Rankin for contributing these
    markups and the original suggestion for WikiTrails.
*/

$HTMLStylesFmt['extend'] = "
.trailRight { float:right; }
";

Markup_e('<<|','<links','/&lt;&lt;\\|([^|]+|\\[\\[(.+?)\\]\\])\\|&gt;&gt;/',
  "MakeTrailStop(\$pagename,\$m[1])");
Markup_e('<|','><<|','/&lt;\\|([^|]+|\\[\\[(.+?)\\]\\])\\|&gt;/',
  "MakeTrailStopB(\$pagename,\$m[1])");
Markup_e('^|','<links','/\\^\\|([^|]+|\\[\\[(.+?)\\]\\])\\|\\^/',
  "MakeTrailPath(\$pagename,\$m[1])");
Markup_e('<<(:','>(:','/&lt;&lt;(\(:[^|]+|\\[\\[(.+?)\\]\\]:\))&gt;&gt;/',
  "MakeTrailStopC(\$pagename,\$m[1])");

SDVA($FPLFunctions,array('bygroup'=>'FPLByGroup','simple'=>'FPLSimple',
  'group'=>'FPLGroup', 'markup'=>'FPLMarkup'));


function FPLMarkup($pagename, &$matches, $opt) {
  global $FPLMarkupFmt, $FPLMarkupOpt;
  SDV($FPLMarkupFmt,"\n* [[\$Name|+]]");
  SDVA($FPLMarkupOpt, array('readf' => 0));
  $topt['order'] = (@$opt['trail']) ? '' : 'name';
  $matches = MakePageList($pagename, 
                 array_merge($topt, (array)$FPLMarkupOpt, $opt));
  $out = array();
  foreach($matches as $pc) 
    $out[] = FmtPageName($FPLMarkupFmt, $pc['pagename']);
  return implode('', $out);
}


function ExpandPageList($trailname,$options) {
  $options = preg_replace('/fmt=\w+/i','',$options)." fmt=markup ";
  $opt = array('o'=>$options);
  return FmtPageList('$MatchList',$trailname,$opt);
}


function ReadTrail($pagename,$trailname) {
  global $SuffixPattern,$GroupPattern,$WikiWordPattern,$LinkWikiWords;
  if (preg_match('/^\\[\\[(.+?)(-&gt;|\\|)(.+?)\\]\\]$/', $trailname, $m)) 
    $trailname = ($m[2] == '|') ? $m[1] : $m[3];
  if (substr($trailname,0,10) != '(:pagelist') {
    $trailname = MakePageName($pagename,$trailname);
    $trailpage = ReadPage($trailname, READPAGE_CURRENT);
    if (!$trailpage) return false;
  } else $trailpage['text'] = $trailname;

    $trailpage['text'] = preg_replace("/\\(:pagelist\\s*(.*):\\)/e","ExpandPageList('$trailname','\\1')",$trailpage['text']);

  $t = array();
  $n = 0;
  foreach(explode("\n",@$trailpage['text']) as $x) {
    $x = preg_replace("/\\[\\[([^\\]]*)->([^\\]]*)\\]\\]/",'[[$2|$1]]',$x);
    if (!preg_match("/^([#*:]+) \\s* 
          (\\[\\[([^|]*?)(\\|.*?)?\\]\\]($SuffixPattern)
          | (($GroupPattern([\\/.]))?$WikiWordPattern))/x",$x,$match))
       continue;
    if (@$match[6]) {
       if (!$LinkWikiWords) continue;
       $tgt = MakePageName($trailname,$match[6]);
    } else $tgt = MakePageName($trailname,$match[3]);
    $t[$n]['depth'] = $depth = strlen($match[1]);
    $t[$n]['pagename'] = $tgt;
    $t[$n]['markup'] = $match[2];
    for($i=$depth;$i<10;$i++) $d[$i]=$n;
    if ($depth>1) $t[$n]['parent']=@$d[$depth-1];
    $n++;
  }
  return $t;
}

function MakeTrailStop($pagename,$trailname) {
  $t = ReadTrail($pagename,$trailname);
  $prev=''; $next='';
  for($i=0;$i<count($t);$i++) {
    if ($t[$i]['pagename']==$pagename) {
      if ($i>0) $prev = $t[$i-1]['markup'];
      if ($i+1<count($t)) $next = $t[$i+1]['markup'];
    }
  }
  return "<span class='wikitrail'>&lt;&lt; $prev | $trailname | $next &gt;&gt;</span>";
}

function MakeTrailStopB($pagename,$trailname) {
  $t = ReadTrail($pagename,$trailname);
  $prev = ''; $next = '';
  for($i=0;$i<count($t);$i++) {
    if ($t[$i]['pagename']==$pagename) {
      if ($i>0) $prev = '&lt; '.$t[$i-1]['markup'].' | ';
      if ($i+1<count($t)) $next = ' | '.$t[$i+1]['markup'].' &gt;';
    }
  }
  return "<span class='wikitrail'>$prev$trailname$next</span>";
}

function MakeTrailStopC($pagename,$trailname) {
  $t = ReadTrail($pagename,$trailname);
  $prev=''; $next='';
  for($i=0;$i<count($t);$i++) {
    if ($t[$i]['pagename']==$pagename) {
      if ($i>0) $prev = "<span class='trailLeft'>&lt;&lt; ".$t[$i-1]['markup']."</span>";
      if ($i+1<count($t)) $next = "<span class='trailRight'>".$t[$i+1]['markup']." &gt;&gt;</span>";
    }
  }
  return "<span class='wikitrail'>$next$prev</span>";
}
 

function MakeTrailPath($pagename,$trailname) {
  global $TrailPathSep;
  SDV($TrailPathSep,' | ');
  $t = ReadTrail($pagename,$trailname);
  $crumbs = '';
  for($i=0;$i<count($t);$i++) {
    if ($t[$i]['pagename']==$pagename) {
      while (@$t[$i]['depth']>0) {
        $crumbs = $TrailPathSep.$t[$i]['markup'].$crumbs;
        $i = @$t[$i]['parent'];
      }
      return "<span class='wikitrail'>$trailname$crumbs</span>";
    }
  }
  return $trailname;
}