From 0df3978cc5891f1383dd0dbcdc1c6b4c0010e645 Mon Sep 17 00:00:00 2001
From: Andrew Manning <tamanning@zoho.com>
Date: Sat, 25 Jun 2016 14:29:52 -0500
Subject: A page name wrapped in double brackets is converted into a link to
 another page in the current wiki

---
 Zotlabs/Module/Wiki.php | 15 +++++++++++----
 include/wiki.php        | 20 ++++++++++++++++++++
 view/tpl/wiki.tpl       |  2 +-
 3 files changed, 32 insertions(+), 5 deletions(-)

diff --git a/Zotlabs/Module/Wiki.php b/Zotlabs/Module/Wiki.php
index 1c3add38f..de5863d2e 100644
--- a/Zotlabs/Module/Wiki.php
+++ b/Zotlabs/Module/Wiki.php
@@ -74,7 +74,9 @@ class Wiki extends \Zotlabs\Web\Controller {
 				// Configure page template
 				$wikiheaderName = t('Wiki');
 				$wikiheaderPage = t('Sandbox');
-				$content = '"# Wiki Sandbox\n\nContent you **edit** and **preview** here *will not be saved*."';
+				require_once('library/markdown.php');	
+				$content = t('"# Wiki Sandbox\n\nContent you **edit** and **preview** here *will not be saved*."');
+				$renderedContent = Markdown(json_decode($content));
 				$hide_editor = false;
 				$showPageControls = false;
 				$showNewWikiButton = $wiki_owner;
@@ -122,6 +124,9 @@ class Wiki extends \Zotlabs\Web\Controller {
 					goaway('/'.argv(0).'/'.argv(1).'/'.$wikiUrlName);
 				}
 				$content = ($p['content'] !== '' ? $p['content'] : '"# New page\n"');
+				// Render the Markdown-formatted page content in HTML
+				require_once('library/markdown.php');	
+				$renderedContent = wiki_convert_links(Markdown(json_decode($content)),argv(0).'/'.argv(1).'/'.$wikiUrlName);
 				$hide_editor = false;
 				$showPageControls = $wiki_editor;
 				$showNewWikiButton = $wiki_owner;
@@ -133,8 +138,6 @@ class Wiki extends \Zotlabs\Web\Controller {
 			default:	// Strip the extraneous URL components
 				goaway('/'.argv(0).'/'.argv(1).'/'.$wikiUrlName.'/'.$pageUrlName);
 		}
-		// Render the Markdown-formatted page content in HTML
-		require_once('library/markdown.php');	
 		
 		$wikiModalID = random_string(3);
 		$wikiModal = replace_macros(
@@ -162,7 +165,7 @@ class Wiki extends \Zotlabs\Web\Controller {
 			'$acl' => $x['acl'],
 			'$bang' => $x['bang'],
 			'$content' => $content,
-			'$renderedContent' => Markdown(json_decode($content)),
+			'$renderedContent' => $renderedContent,
 			'$wikiName' => array('wikiName', t('Enter the name of your new wiki:'), '', ''),
 			'$pageName' => array('pageName', t('Enter the name of the new page:'), '', ''),
 			'$pageRename' => array('pageRename', t('Enter the new name:'), '', ''),
@@ -193,8 +196,12 @@ class Wiki extends \Zotlabs\Web\Controller {
 		// Render mardown-formatted text in HTML for preview
 		if((argc() > 2) && (argv(2) === 'preview')) {
 			$content = $_POST['content'];
+			$resource_id = $_POST['resource_id']; 
 			require_once('library/markdown.php');
 			$html = purify_html(Markdown($content));
+			$w = wiki_get_wiki($resource_id);
+			$wikiURL = argv(0).'/'.argv(1).'/'.$w['urlName'];
+			$html = wiki_convert_links($html,$wikiURL);
 			json_return_and_die(array('html' => $html, 'success' => true));
 		}
 		
diff --git a/include/wiki.php b/include/wiki.php
index fdbc704dc..63cf70f3c 100644
--- a/include/wiki.php
+++ b/include/wiki.php
@@ -473,4 +473,24 @@ function wiki_generate_page_filename($name) {
 	} else {
 		return $file . '.md';
 	}	
+}
+
+function wiki_convert_links($s, $wikiURL) {
+	
+	if (strpos($s,'[[') !== false) {
+		preg_match_all("/\[\[(.*?)\]\]/", $s, $match);
+		$pages = $pageURLs = array();
+		foreach ($match[1] as $m) {
+			// TODO: Why do we need to double urlencode for this to work?
+			$pageURLs[] = urlencode(urlencode(escape_tags($m)));
+			$pages[] = $m;
+		}
+		$idx = 0;
+		while(strpos($s,'[[') !== false) {
+		$replace = '<a href="'.$wikiURL.'/'.$pageURLs[$idx].'">'.$pages[$idx].'</a>';
+			$s = preg_replace("/\[\[(.*?)\]\]/", $replace, $s, 1);
+			$idx++;
+		}
+	}
+	return $s;
 }
\ No newline at end of file
diff --git a/view/tpl/wiki.tpl b/view/tpl/wiki.tpl
index d0744009d..1d8570828 100644
--- a/view/tpl/wiki.tpl
+++ b/view/tpl/wiki.tpl
@@ -200,7 +200,7 @@
   editor.getSession().setValue(window.wiki_page_content);
 
   $('#wiki-get-preview').click(function (ev) {
-    $.post("wiki/{{$channel}}/preview", {content: editor.getValue()}, function (data) {
+    $.post("wiki/{{$channel}}/preview", {content: editor.getValue(), resource_id: window.wiki_resource_id}, function (data) {
       if (data.success) {
         $('#wiki-preview').html(data.html);
       } else {
-- 
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