fix(tauri-build): use `::tauri` as root for the CodegenContext (#4894)

.changes/fix-build-codegen.md

@@ -0,0 +1,5 @@
+---
+"tauri-build": patch
+---
+
+Fix root of codegen output when using the `CodegenContext` API.

core/tauri-build/src/codegen/context.rs

@@ -52,13 +52,13 @@ impl CodegenContext {
   ///
   /// **Note:** This path should be relative to the `OUT_DIR`.
   ///
-  /// Don't set this if you are using [`tauri::include_codegen_context!`] as that helper macro
+  /// Don't set this if you are using [`tauri::tauri_build_context!`] as that helper macro
   /// expects the default value. This option can be useful if you are not using the helper and
   /// instead using [`std::include!`] on the generated code yourself.
   ///
   /// Defaults to `tauri-build-context.rs`.
   ///
-  /// [`tauri::include_codegen_context!`]: https://docs.rs/tauri/0.12/tauri/macro.include_codegen_context.html
+  /// [`tauri::tauri_build_context!`]: https://docs.rs/tauri/latest/tauri/macro.tauri_build_context.html
   #[must_use]
   pub fn out_file(mut self, filename: PathBuf) -> Self {
     self.out_file = filename;
@@ -98,7 +98,7 @@ impl CodegenContext {
       config_parent,
       // it's very hard to have a build script for unit tests, so assume this is always called from
       // outside the tauri crate, making the ::tauri root valid.
-      root: quote::quote!(::tauri::Context),
+      root: quote::quote!(::tauri),
     })?;
 
     // get the full output file path

examples/api/src-tauri/Cargo.lock

@@ -3165,6 +3165,7 @@ dependencies = [
  "cargo_toml",
  "heck 0.4.0",
  "json-patch",
+ "quote",
  "semver 1.0.12",
  "serde_json",
  "tauri-codegen",

examples/api/src-tauri/Cargo.toml

@@ -7,7 +7,7 @@ rust-version = "1.57"
 license = "Apache-2.0 OR MIT"
 
 [build-dependencies]
-tauri-build = { path = "../../../core/tauri-build", features = ["isolation"] }
+tauri-build = { path = "../../../core/tauri-build", features = ["isolation", "codegen"] }
 
 [dependencies]
 serde_json = "1.0"

examples/api/src-tauri/build.rs

@@ -3,5 +3,10 @@
 // SPDX-License-Identifier: MIT
 
 fn main() {
+  let mut codegen = tauri_build::CodegenContext::new();
+  if !cfg!(feature = "custom-protocol") {
+    codegen = codegen.dev();
+  }
+  codegen.build();
   tauri_build::build()
 }

examples/api/src-tauri/src/main.rs

@@ -199,7 +199,7 @@ fn main() {
       cmd::log_operation,
       cmd::perform_request,
     ])
-    .build(tauri::generate_context!())
+    .build(tauri::tauri_build_context!())
     .expect("error while building tauri application");
 
   #[cfg(target_os = "macos")]