fix(android): allow and escape Kotlin keywords as package identifier, closes #9743

.changes/cli-allow-kotlin-keyword-as-ident.md

@@ -0,0 +1,5 @@
+---
+"tauri-cli": "patch:enhance"
+---
+
+On Android, allow using Kotlin keywords as identifiers and escape them in templates.

tooling/cli/Cargo.toml

@@ -39,7 +39,7 @@ name = "cargo-tauri"
 path = "src/main.rs"
 
 [dependencies]
-cargo-mobile2 = { version = "0.12", default-features = false }
+cargo-mobile2 = { version = "0.12.1", default-features = false }
 jsonrpsee = { version = "0.22", features = [ "server" ] }
 jsonrpsee-core = "0.22"
 jsonrpsee-client-transport = { version = "0.22", features = [ "ws" ] }

tooling/cli/src/mobile/android/mod.rs

@@ -133,7 +133,10 @@ pub fn get_config(
     ..Default::default()
   };
 
-  set_var("WRY_ANDROID_PACKAGE", app.reverse_identifier());
+  set_var(
+    "WRY_ANDROID_PACKAGE",
+    app.android_identifier_escape_kotlin_keyword(),
+  );
   set_var("WRY_ANDROID_LIBRARY", app.lib_name());
   set_var("TAURI_ANDROID_PROJECT_PATH", config.project_dir());
 

tooling/cli/src/mobile/init.rs

@@ -14,6 +14,7 @@ use cargo_mobile2::{
   },
   config::app::App,
   dot_cargo,
+  reserved_names::KOTLIN_ONLY_KEYWORDS,
   target::TargetTrait as _,
   util::{
     self,
@@ -215,6 +216,7 @@ fn handlebars(app: &App) -> (Handlebars<'static>, JsonMap) {
     "reverse-domain-snake-case",
     Box::new(reverse_domain_snake_case),
   );
+  h.register_helper("escape-kotlin-keyword", Box::new(escape_kotlin_keyword));
   // don't mix these up or very bad things will happen to all of us
   h.register_helper("prefix-path", Box::new(prefix_path));
   h.register_helper("unprefix-path", Box::new(unprefix_path));
@@ -360,6 +362,28 @@ fn reverse_domain_snake_case(
     .map_err(Into::into)
 }
 
+fn escape_kotlin_keyword(
+  helper: &Helper,
+  _: &Handlebars,
+  _: &Context,
+  _: &mut RenderContext,
+  out: &mut dyn Output,
+) -> HelperResult {
+  let escaped_result = get_str(helper)
+    .split('.')
+    .map(|s| {
+      if KOTLIN_ONLY_KEYWORDS.contains(&s) {
+        format!("`{}`", s)
+      } else {
+        s.to_string()
+      }
+    })
+    .collect::<Vec<_>>()
+    .join(".");
+
+  out.write(&escaped_result).map_err(Into::into)
+}
+
 fn app_root(ctx: &Context) -> Result<&str, RenderError> {
   let app_root = ctx
     .data()

tooling/cli/templates/mobile/android/app/src/main/MainActivity.kt

@@ -1,3 +1,3 @@
-package {{reverse-domain app.identifier}}
+package {{escape-kotlin-keyword (reverse-domain app.identifier)}}
 
 class MainActivity : TauriActivity()