Add 'template_vars' hook

doc/Plugins.md

@@ -271,6 +271,12 @@ $b is an array, params to mail()
 is called after the navigational menu is build in include/nav.php.
 $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.
+
+
 Complete list of hook callbacks
 ---
 

include/text.php

@@ -19,6 +19,10 @@ 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();