Add dynamic help text generation for DurationType form

Author: chapterjason

src/Form/DurationType.php

@@ -166,6 +166,36 @@ public function configureOptions(OptionsResolver $resolver): void
 
             return $data;
         });
+
+        $resolver->setNormalizer('help', function (Options $options, $value) {
+            if (null === $value) {
+                $dotFields = ['year', 'month', 'day'];
+                $colonFields = ['hour', 'minute', 'second'];
+
+                $dotFields = array_values(array_filter($dotFields, static fn ($field) => isset($options[$field]) && $options[$field]));
+                $colonFields = array_values(array_filter($colonFields, static fn ($field) => isset($options[$field]) && $options[$field]));
+
+                $value = '';
+
+                for ($index = 0, $lastIndex = \count($dotFields); $index < $lastIndex; ++$index) {
+                    if ($index === $lastIndex - 1 && 0 === \count($colonFields)) {
+                        $value .= \sprintf('%ss', $dotFields[$index]);
+                    } else {
+                        $value .= \sprintf('%ss.', $dotFields[$index]);
+                    }
+                }
+
+                for ($index = 0, $lastIndex = \count($colonFields); $index < $lastIndex; ++$index) {
+                    if ($index === $lastIndex - 1) {
+                        $value .= \sprintf('%ss', $colonFields[$index]);
+                    } else {
+                        $value .= \sprintf('%ss:', $colonFields[$index]);
+                    }
+                }
+            }
+
+            return $value;
+        });
     }
 
     public function getBlockPrefix(): string

tests/Form/DurationTypeTest.php

@@ -43,8 +43,11 @@ public function testConfigureAnotherUnit(): void
         ]);
 
         // Assert
+        $view = $form->createView();
+
         $this->assertTrue($form->isSynchronized());
         $this->assertEquals(new Second("5196852"), $form->getData()->getValue());
+        $this->assertSame("months.hours:minutes:seconds", $view->vars['help']);
     }
 
     public function testSubmitNull(): void
@@ -68,6 +71,7 @@ public function testWithPreData(): void
         // Act
         $view = $form->createView();
 
+
         // Assert
         $this->assertSame([
             'year' => null,
@@ -77,6 +81,8 @@ public function testWithPreData(): void
             'minute' => '12',
             'second' => null,
         ], $view->vars['value']);
+
+        $this->assertSame("hours:minutes", $view->vars['help']);
     }
 
     public function testWithNullPreData(): void
@@ -89,5 +95,6 @@ public function testWithNullPreData(): void
 
         // Assert
         $this->assertNull($view->vars['value']);
+        $this->assertSame("hours:minutes", $view->vars['help']);
     }
 }