Add configurable @blueprint template base path

Adds a new configuration option to customize where Statamic looks for
templates when using `@blueprint` in collections.

Author: o1y

Diff for: config/system.php

@@ -218,4 +218,18 @@
 
     'layout' => env('STATAMIC_LAYOUT', 'layout'),
 
+    /*
+    |--------------------------------------------------------------------------
+    | Blueprint Template Base Path
+    |--------------------------------------------------------------------------
+    |
+    | When using @blueprint in a collection's template setting, Statamic looks for
+    | templates in /resources/views/{collection}/{blueprint}.antlers.html. Set this
+    | value to use a different base path
+    | (e.g. 'templates' for /resources/views/templates/).
+    |
+    */
+
+    'blueprint_template_base_path' => env('STATAMIC_BLUEPRINT_TEMPLATE_PATH', null),
+
 ];

Diff for: src/Entries/Entry.php

@@ -528,7 +528,10 @@ public function template($template = null)
 
     protected function inferTemplateFromBlueprint()
     {
-        $template = $this->collection()->handle().'.'.$this->blueprint();
+        $basePath = config('statamic.system.blueprint_template_base_path');
+        $prefix = $basePath ?: $this->collection()->handle();
+
+        $template = $prefix.'.'.$this->blueprint();
 
         $slugifiedTemplate = str_replace('_', '-', $template);
 

Diff for: tests/Data/Entries/EntryTest.php

@@ -1915,6 +1915,26 @@ public function it_gets_and_sets_an_inferred_template_from_blueprint()
         $this->assertEquals('articles.custom', $entry->template());
     }
 
+    #[Test]
+    public function it_respects_custom_blueprint_template_base_path()
+    {
+        // Set custom base path for test
+        config(['statamic.system.blueprint_template_base_path' => 'custom.path']);
+
+        $collection = tap(Collection::make('articles')->template('@blueprint'))->save();
+        $blueprint = tap(Blueprint::make('standard_article')->setNamespace('collections.articles'))->save();
+        $entry = Entry::make('test')->collection($collection)->blueprint($blueprint->handle());
+
+        // entry uses the custom path instead of collection handle
+        $this->assertEquals('custom.path.standard_article', $entry->template());
+
+        // entry uses slugified custom path when that template exists
+        View::shouldReceive('exists')->with('custom.path.standard-article')->andReturn(true);
+        $this->assertEquals('custom.path.standard-article', $entry->template());
+
+        config(['statamic.system.blueprint_template_base_path' => null]);
+    }
+
     #[Test]
     public function it_gets_and_sets_the_layout()
     {