add custom index template config option

Author: erikaheidi

src/StaticBuilder.php

@@ -70,8 +70,11 @@ public function getIndexPage(): string
         $indexPage = null;
 
         if ($this->siteConfig->site_index !== null) {
+            $pageTpl = $this->siteConfig->site_index_tpl ?? 'content/single.html.twig';
             $page = $this->contentProvider->fetch($this->siteConfig->site_index);
-            $indexPage = $this->getSinglePage($page);
+            $indexPage =  $this->twigServiceProvider->render($pageTpl, [
+                'content' => $page,
+            ]);
         }
 
         if ($indexPage === null) {

tests/Pest.php

@@ -90,6 +90,7 @@ function getCustomIndexPageApp(): App
 {
     $config = getDefaultAppConfig();
     $config['site_index'] = 'posts/test0';
+    $config['site_index_tpl'] = 'content/index.html.twig';
 
     $app = new App($config);
     $app->addService('builder', new StaticBuilder());

tests/Resources/templates/content/index.html.twig

@@ -0,0 +1 @@
+template index

tests/Unit/StaticBuilderTest.php

@@ -46,7 +46,7 @@
     expect(is_file($app->builder->outputPath . '/index.html'))->toBeTrue();
 
     $content = file_get_contents($app->builder->outputPath . '/index.html');
-    expect($content)->toMatch("/template single/");
+    expect($content)->toMatch("/template index/");
 });
 
 test('StaticBuilder builds paginated tag pages', function () {