From 812d904c98d6fb3a4124f6e2415de5a139f954ce Mon Sep 17 00:00:00 2001
From: zotlabs <mike@macgirvin.com>
Date: Sun, 22 Oct 2017 18:23:37 -0700
Subject: bring back the markdown post feature (after investing some effort to
 make it work)

---
 Zotlabs/Module/Item.php | 46 +++++++++-------------------------------------
 include/features.php    |  9 +++++++++
 include/markdown.php    | 11 +++++++----
 include/network.php     |  4 ++++
 4 files changed, 29 insertions(+), 41 deletions(-)

diff --git a/Zotlabs/Module/Item.php b/Zotlabs/Module/Item.php
index 9e5dcfaff..b54de0fb9 100644
--- a/Zotlabs/Module/Item.php
+++ b/Zotlabs/Module/Item.php
@@ -511,48 +511,20 @@ class Item extends \Zotlabs\Web\Controller {
 	
 			require_once('include/text.php');			
 	
-			// Markdown doesn't work correctly. Do not re-enable unless you're willing to fix it and support it.
-	
-			// Sample that will probably give you grief - you must preserve the linebreaks
-			// and provide the correct markdown interpretation and you cannot allow unfiltered HTML
-	
-			// Markdown
-			// ========
-			//
-			// **bold** abcde
-			// fghijkl
-			// *italic*
-			// <img src="javascript:alert('hacked');" />
-	
-	//		if($uid && $uid == $profile_uid && feature_enabled($uid,'markdown')) {
-	//			require_once('include/markdown.php');
-	//			$body = escape_tags(trim($body));
-	//			$body = str_replace("\n",'<br />', $body);
-	//			$body = preg_replace_callback('/\[share(.*?)\]/ism','\share_shield',$body);			
-	//			$body = markdown_to_bb($body,true);
-	//			$body = preg_replace_callback('/\[share(.*?)\]/ism','\share_unshield',$body);
-	//		}
+			if($uid && $uid == $profile_uid && feature_enabled($uid,'markdown')) {
+				require_once('include/markdown.php');
+				$body = preg_replace_callback('/\[share(.*?)\]/ism','\share_shield',$body);			
+				$body = markdown_to_bb($body,true,['preserve_lf' => true]);
+				$body = preg_replace_callback('/\[share(.*?)\]/ism','\share_unshield',$body);
+
+			}
 	
 			// BBCODE alert: the following functions assume bbcode input
 			// and will require alternatives for alternative content-types (text/html, text/markdown, text/plain, etc.)
 			// we may need virtual or template classes to implement the possible alternatives
-	
-			// Work around doubled linefeeds in Tinymce 3.5b2
-			// First figure out if it's a status post that would've been
-			// created using tinymce. Otherwise leave it alone. 
-	
-			$plaintext = true;
-	
-	//		$plaintext = ((feature_enabled($profile_uid,'richtext')) ? false : true);
-	//		if((! $parent) && (! $api_source) && (! $plaintext)) {
-	//			$body = fix_mce_lf($body);
-	//		}
-	
-	
-	
+			
 			// If we're sending a private top-level message with a single @-taggable channel as a recipient, @-tag it, if our pconfig is set.
-	
-	
+		
 			if((! $parent) && (get_pconfig($profile_uid,'system','tagifonlyrecip')) && (substr_count($str_contact_allow,'<') == 1) && ($str_group_allow == '') && ($str_contact_deny == '') && ($str_group_deny == '')) {
 				$x = q("select abook_id, abconfig.v from abook left join abconfig on abook_xchan = abconfig.xchan and abook_channel = abconfig.chan and cat= 'their_perms' and abconfig.k = 'tag_deliver' and abconfig.v = 1 and abook_xchan = '%s' and abook_channel = %d limit 1",
 					dbesc(str_replace(array('<','>'),array('',''),$str_contact_allow)),
diff --git a/include/features.php b/include/features.php
index f84c9cb05..d8d98dbaa 100644
--- a/include/features.php
+++ b/include/features.php
@@ -363,6 +363,15 @@ function get_features($filtered = true) {
 
 			t('Post/Comment Tools'),
 
+			[
+				'markdown',        
+				t('Markdown'),					
+				t('Use markdown for editing posts'),
+				false,
+				get_config('feature_lock','markdown'),
+				feature_level('markdown',2),
+			],
+
 			[
 				'commtag',        
 				t('Community Tagging'),					
diff --git a/include/markdown.php b/include/markdown.php
index 0cd9ab237..0464cf71a 100644
--- a/include/markdown.php
+++ b/include/markdown.php
@@ -49,14 +49,17 @@ function markdown_to_bb($s, $use_zrl = false, $options = []) {
 
 	$s = $x['text'];
 
-	// Escaping the hash tags - doesn't always seem to work
-	// $s = preg_replace('/\#([^\s\#])/','\\#$1',$s);
-	// This seems to work
+	// Escaping the hash tags
 	$s = preg_replace('/\#([^\s\#])/','&#35;$1',$s);
 
 	$s = MarkdownExtra::defaultTransform($s);
 
-	$s = str_replace("\r","",$s);
+	if($options && $options['preserve_lf']) {
+		$s = str_replace(["\r","\n"],["",'<br>'],$s);
+	}
+	else {
+		$s = str_replace("\r","",$s);
+	}
 
 	$s = str_replace('&#35;','#',$s);
 
diff --git a/include/network.php b/include/network.php
index 7e2dbf4cf..2f29a70c4 100644
--- a/include/network.php
+++ b/include/network.php
@@ -716,6 +716,10 @@ function scale_external_images($s, $include_link = true, $scale_replace = false)
 				$scaled = str_replace($scale_replace[0], $scale_replace[1], $mtch[3]);
 			else
 				$scaled = $mtch[3];
+
+			if(! strpbrk(substr($scaled,0,1),'zhfmt'))
+				continue;
+
 			$i = z_fetch_url($scaled,true);
 
 
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