fix: Skip writing scaffold config for nixified custom templates (#415)

* Add skip_config_check global flag to scaffolding

* Prefer not writing the scaffold config for nixified custom templates

* Fix rustfmt warning

src/cli/example.rs

@@ -270,11 +270,11 @@ impl Example {
         };
 
         let ScaffoldedTemplate {
-            file_tree,
+            mut file_tree,
             next_instructions,
         } = scaffold_example(file_tree, package_manager, &template_file_tree, &example)?;
 
-        let file_tree = ScaffoldConfig::write_to_package_json(file_tree, template_type)?;
+        ScaffoldConfig::write_to_package_json(&mut file_tree, template_type)?;
 
         build_file_tree(file_tree, &app_dir)?;
 

src/cli/web_app.rs

@@ -90,7 +90,7 @@ impl WebApp {
         };
 
         let ScaffoldedTemplate {
-            file_tree,
+            mut file_tree,
             next_instructions,
         } = scaffold_web_app(
             &name,
@@ -101,7 +101,9 @@ impl WebApp {
             self.holo_enabled,
         )?;
 
-        let file_tree = ScaffoldConfig::write_to_package_json(file_tree, template_type)?;
+        if !template_type.is_nixified_custom_template() {
+            ScaffoldConfig::write_to_package_json(&mut file_tree, template_type)?;
+        }
 
         build_file_tree(file_tree, &app_folder)?;
 

src/scaffold/config.rs

@@ -33,15 +33,15 @@ impl ScaffoldConfig {
     }
 
     pub fn write_to_package_json(
-        mut web_app_file_tree: FileTree,
+        web_app_file_tree: &mut FileTree,
         template_type: &TemplateType,
-    ) -> ScaffoldResult<FileTree> {
+    ) -> ScaffoldResult<()> {
         let config = ScaffoldConfig {
             template: template_type.clone(),
         };
         let package_json_path = PathBuf::from("package.json");
 
-        map_file(&mut web_app_file_tree, &package_json_path, |c| {
+        map_file(web_app_file_tree, &package_json_path, |c| {
             let original_content = c.clone();
             let json = serde_json::from_str::<Value>(&c)?;
             let json = match json {
@@ -59,6 +59,6 @@ impl ScaffoldConfig {
             Ok(json)
         })?;
 
-        Ok(web_app_file_tree)
+        Ok(())
     }
 }

src/scaffold/web_app/template_type.rs

@@ -123,6 +123,14 @@ impl TemplateType {
             .interact()?;
         Ok(frameworks[selection].clone())
     }
+
+    /// Checks whether the custom template'path is a path to a nix store
+    pub fn is_nixified_custom_template(&self) -> bool {
+        if let TemplateType::Custom(path) = self {
+            return path.starts_with("/nix/store/");
+        }
+        false
+    }
 }
 
 impl From<PathBuf> for TemplateType {