scaffold the app: tauri crate, vite front end, icons, ci

src-tauri/build.rs

@@ -0,0 +1,29 @@
+use std::path::{Path, PathBuf};
+
+fn main() {
+    embed_credentials();
+    tauri_build::build()
+}
+
+// The OAuth desktop client is baked into the binary, but a clone of this repo has no
+// google-credentials.json. Embedding the example file instead of failing the build turns a
+// confusing compile error into the runtime "not set up yet" message from load_credentials.
+fn embed_credentials() {
+    let root: PathBuf = Path::new(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .expect("manifest dir has a parent")
+        .to_path_buf();
+    let real = root.join("google-credentials.json");
+    let example = root.join("google-credentials.example.json");
+
+    println!("cargo:rerun-if-changed={}", real.display());
+    println!("cargo:rerun-if-changed={}", example.display());
+
+    let source = if real.exists() { &real } else { &example };
+    let contents = std::fs::read(source)
+        .unwrap_or_else(|e| panic!("could not read {}: {e}", source.display()));
+
+    let out = Path::new(&std::env::var("OUT_DIR").expect("OUT_DIR is set"))
+        .join("google-credentials.json");
+    std::fs::write(&out, contents).expect("could not write embedded credentials");
+}