add a minversion to the theme and fallback to default if requirement is not met. mark incompatible themes in the theme selector

Zotlabs/Module/Admin/Site.php

@@ -163,6 +163,13 @@ class Site {
 			foreach($files as $file) {
 				$vars = '';
 				$f = basename($file);
+
+				$min_version = ((file_exists('view/theme/' . $f . '/.MINVERSION')) ? file_get_contents('view/theme/' . $f . '/.MINVERSION') : 0);
+				if((version_compare($min_version, STD_VERSION, '>=')) || ($min_version == 0)) {
+					$theme_choices[$f] = $theme_choices_mobile[$f] = sprintf(t('%s - (Incompatible)'), $f);
+					continue;
+				}
+
 				if (file_exists($file . '/library'))
 					continue;
 				if (file_exists($file . '/mobile'))
@@ -310,4 +317,4 @@ class Site {
 		));
 	}
 
-}
+}

Zotlabs/Module/Admin/Themes.php

@@ -230,4 +230,4 @@ class Themes {
 
 
 
-}
+}