feat: can override customized functions

Author: kenjis

src/CI4Twig/Twig.php

@@ -253,7 +253,16 @@ protected function addFunctions()
         }
 
         // customized functions
-        if (function_exists('anchor')) {
+        $this->addCustomizedFunctions();
+
+        $this->functions_added = true;
+    }
+
+    protected function addCustomizedFunctions()
+    {
+        $functions = array_merge($this->functions_asis, $this->functions_safe);
+
+        if (! in_array('anchor', $functions, true) && function_exists('anchor')) {
             $this->twig->addFunction(
                 new TwigFunction(
                     'anchor',
@@ -263,15 +272,15 @@ protected function addFunctions()
             );
         }
 
-        $this->twig->addFunction(
-            new TwigFunction(
-                'validation_list_errors',
-                [$this, 'validation_list_errors'],
-                ['is_safe' => ['html']]
-            )
-        );
-
-        $this->functions_added = true;
+        if (! in_array('validation_list_errors', $functions, true)) {
+            $this->twig->addFunction(
+                new TwigFunction(
+                    'validation_list_errors',
+                    [$this, 'validation_list_errors'],
+                    ['is_safe' => ['html']]
+                )
+            );
+        }
     }
 
     /**

tests/CI4Twig/TwigTest.php

@@ -107,6 +107,18 @@ public function testFunctionSafe()
         $this->assertSame("<s>test</s>\n", $output);
     }
 
+    public function testFunctionCustomized()
+    {
+        $obj = new Twig([
+            'paths'     => __DIR__ . '/../templates/',
+            'functions' => ['validation_list_errors'],
+            'cache'     => false,
+        ]);
+
+        $output = $obj->render('functions_customized_override');
+        $this->assertSame("override\n", $output);
+    }
+
     public function testFilter()
     {
         $obj = new Twig([

tests/templates/functions_customized_override.twig

@@ -0,0 +1 @@
+{{ validation_list_errors() }}

tests/twig_functions.php

@@ -4,3 +4,8 @@ function test_safe(): string
 {
     return '<s>test</s>';
 }
+
+function validation_list_errors(): string
+{
+    return 'override';
+}