commit 979e77571f7aadc1d043b4bea814356cce4577b6
Author: Wong Ding Feng <dingfengwong@gmail.com>
Date:   Mon Aug 10 23:49:06 2026 +0800

    Add clap CLI, lib crate, unit test, and criterion benchmark
    
    Minimal scaffold before turning this into a Nix flake template.
    
    Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
    Claude-Session: https://claude.ai/code/session_018ALEXkc7pTro7tF1WcUuKb

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..52b761f
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "rust_template"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+clap = { version = "4.6.6", features = ["derive"] }
+
+[dev-dependencies]
+criterion = { version = "0.8.2", features = ["html_reports"] }
+
+[[bench]]
+name = "greet"
+harness = false
diff --git a/benches/greet.rs b/benches/greet.rs
new file mode 100644
index 0000000..05e91d9
--- /dev/null
+++ b/benches/greet.rs
@@ -0,0 +1,10 @@
+use criterion::{Criterion, criterion_group, criterion_main};
+use rust_template::greet;
+use std::hint::black_box;
+
+fn bench_greet(c: &mut Criterion) {
+    c.bench_function("greet", |b| b.iter(|| greet(black_box("world"))));
+}
+
+criterion_group!(benches, bench_greet);
+criterion_main!(benches);
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..f389053
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,13 @@
+pub fn greet(name: &str) -> String {
+    format!("Hello, {name}!")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn greets_by_name() {
+        assert_eq!(greet("world"), "Hello, world!");
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..8c65d0b
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,15 @@
+use clap::Parser;
+use rust_template::greet;
+
+#[derive(Parser)]
+#[command(version, about)]
+struct Cli {
+    /// Name to greet
+    #[arg(default_value = "world")]
+    name: String,
+}
+
+fn main() {
+    let cli = Cli::parse();
+    println!("{}", greet(&cli.name));
+}