[WIP][FEATURE] Support re-definition of File Reference types

The table sys_file_reference of TYPO3 is special. It has a type field,
which references a value of another table "sys_file". As these values
are fixed, it is not possible to extend it with custom types. This
means the only possibility is to override the types "showitem" section.

Some adjustments on various places are needed to make this work:
- Handle typeField "uid_local:type"
- Do not prepend a typeField
- Append the hidden palette filePalette
- Prepend overrides of "type"
- Do not call fillTypeFieldSelectItems

todo: Think about a clever syntax for local overrides with
overrideChildTca.

Fixes: #76

Classes/Definition/Factory/ContentBlockCompiler.php

@@ -342,6 +342,9 @@ private function prependTypeFieldForRecordType(
         ProcessedFieldsResult $result,
         bool $isExistingField
     ): array {
+        if ($result->contentType->table === 'sys_file_reference') {
+            return $yamlFields;
+        }
         if ($isExistingField) {
             $typeFieldDefinition = [
                 'identifier' => $result->tableDefinition->typeField,

Classes/Generator/TcaGenerator.php

@@ -264,6 +264,9 @@ protected function fillTypeFieldSelectItems(): void
             if ($tableDefinition->getTypeField() === null) {
                 continue;
             }
+            if ($tableDefinition->getTable() === 'sys_file_reference') {
+                continue;
+            }
             foreach ($tableDefinition->getContentTypeDefinitionCollection() ?? [] as $typeDefinition) {
                 $languagePathTitle = $typeDefinition->getLanguagePathTitle();
                 if ($this->languageFileRegistry->isset($typeDefinition->getName(), $languagePathTitle)) {
@@ -739,6 +742,10 @@ protected function getRecordTypeStandardShowItem(ContentTypeInterface $typeDefin
         if ($showItem !== '') {
             $parts[] = $showItem;
         }
+        // Add hidden palette with system fields and uid_local.
+        if ($tableDefinition->getTable() === 'sys_file_reference') {
+            $parts[] = '--palette--;;filePalette';
+        }
         if ($this->simpleTcaSchemaFactory->has($tableDefinition->getTable())) {
             $tcaSchema = $this->simpleTcaSchemaFactory->get($tableDefinition->getTable());
             $capability = new NativeTableCapabilityProxy($tcaSchema);

Classes/Schema/SimpleTcaSchema.php

@@ -107,9 +107,13 @@ protected function buildLanguageCapability(): Capability\LanguageAwareSchemaCapa
 
     public function getTypeField(): ?TcaFieldTypeInterface
     {
-        if (isset($this->schemaConfiguration['type']) && isset($this->fields[$this->schemaConfiguration['type']])) {
-            return $this->fields[$this->schemaConfiguration['type']];
+        $type = $this->schemaConfiguration['type'] ?? null;
+        if ($type === null) {
+            return null;
         }
-        return null;
+        if (str_contains($type, ':')) {
+            $type = explode(':', $type, 2)[0];
+        }
+        return $this->fields[$type] ?? null;
     }
 }

ContentBlocks/RecordTypes/my-file-reference/config.yaml

@@ -0,0 +1,24 @@
+name: nikita/my-file-reference
+table: sys_file_reference
+typeName: 2
+fields:
+  - identifier: basic
+    type: Palette
+    label: LLL:EXT:core/Resources/Private/Language/locallang_tca.xlf:sys_file_reference.imageoverlayPalette
+    fields:
+      - identifier: alternative
+        useExistingField: true
+      - identifier: description
+        useExistingField: true
+      - type: Linebreak
+      - identifier: link
+        useExistingField: true
+      - identifier: title
+        useExistingField: true
+      - type: Linebreak
+      - identifier: custom_field
+        type: Text
+        label: My custom Field
+      - type: Linebreak
+      - identifier: crop
+        useExistingField: true