fix(core): do not generate files if plugin has no permissions (#8815)

Author: lucasfernog

.changes/handle-empty-permissions.md

@@ -0,0 +1,6 @@
+---
+"tauri-plugin": patch:enhance
+"tauri-utils": patch:enhance
+---
+
+Do not generate JSON schema and markdown reference file if the plugin does not define any permissions and delete those files if they exist.

core/tauri-plugin/src/build/mod.rs

@@ -101,8 +101,17 @@ impl<'a> Builder<'a> {
     println!("cargo:rerun-if-changed=permissions");
     let permissions = acl::build::define_permissions("./permissions/**/*.*", &name, &out_dir)?;
 
-    acl::build::generate_schema(&permissions, "./permissions")?;
-    acl::build::generate_docs(&permissions, &autogenerated)?;
+    if permissions.is_empty() {
+      let _ = std::fs::remove_file(format!(
+        "./permissions/{}/{}",
+        acl::build::PERMISSION_SCHEMAS_FOLDER_NAME,
+        acl::build::PERMISSION_SCHEMA_FILE_NAME
+      ));
+      let _ = std::fs::remove_file(autogenerated.join(acl::build::PERMISSION_DOCS_FILE_NAME));
+    } else {
+      acl::build::generate_schema(&permissions, "./permissions")?;
+      acl::build::generate_docs(&permissions, &autogenerated)?;
+    }
 
     if let Some(global_scope_schema) = self.global_scope_schema {
       acl::build::define_global_scope_schema(global_scope_schema, &name, &out_dir)?;

core/tauri-utils/src/acl/build.rs

@@ -38,6 +38,9 @@ pub const PERMISSION_SCHEMAS_FOLDER_NAME: &str = "schemas";
 /// Known filename of the permission schema JSON file
 pub const PERMISSION_SCHEMA_FILE_NAME: &str = "schema.json";
 
+/// Known filename of the permission documentation file
+pub const PERMISSION_DOCS_FILE_NAME: &str = "reference.md";
+
 /// Allowed capability file extensions
 const CAPABILITY_FILE_EXTENSIONS: &[&str] = &["json", "toml"];
 
@@ -281,7 +284,7 @@ pub fn generate_docs(permissions: &[PermissionFile], out_dir: &Path) -> Result<(
     }
   }
 
-  let reference_path = out_dir.join("reference.md");
+  let reference_path = out_dir.join(PERMISSION_DOCS_FILE_NAME);
   if docs != read_to_string(&reference_path).unwrap_or_default() {
     std::fs::write(reference_path, docs).map_err(Error::WriteFile)?;
   }