Fix template_var hook

move it to smarty3 replate_macro, pass the theme name in $b

doc/Plugins.md

@@ -274,7 +274,11 @@ $b is an array containing $nav from nav.php.
 ###'template_vars'
 is called before vars are passed to the template engine to render the page.
 The registered function can add,change or remove variables passed to template.
-$b is the array of vars pased to 'replace_macros()' function.
+$b is an array with:
+
+    'template' => filename of template
+    'vars' => array of vars passed to template
+
 
 
 Complete list of hook callbacks

include/friendica_smarty.php

@@ -2,6 +2,7 @@
 
 require_once "object/TemplateEngine.php";
 require_once("library/Smarty/libs/Smarty.class.php");
+require_once "include/plugin.php";
 
 define('SMARTY3_TEMPLATE_FOLDER','templates');
 
@@ -59,6 +60,15 @@ class FriendicaSmartyEngine implements ITemplateEngine {
 			$template = $s;
 			$s = new FriendicaSmarty();
 		}
+
+		// "middleware": inject variables into templates
+		$arr = [
+			"template"=> basename($s->filename),
+			"vars" => $r
+		];
+		call_hooks("template_vars", $arr);
+		$r = $arr['vars'];
+
 		foreach($r as $key=>$value) {
 			if($key[0] === '$') {
 				$key = substr($key, 1);

include/text.php

@@ -19,10 +19,6 @@ function replace_macros($s,$r) {
 
 	$stamp1 = microtime(true);
 
-	// "middleware": inject variables into templates
-	call_hooks("template_vars", $r);
-
-
 	$a = get_app();
 
 	$t = $a->template_engine();