Use clap for yact binary

Cargo.toml

@@ -3,16 +3,22 @@ name = "yact"
 version = "0.1.0"
 edition = "2021"
 license = "GPL-3.0-or-later"
+description = "Yet another commit transformer: a tool for formatting staged files with minimal disturbance to developer workflow."
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [profile.release]
 lto = true
 
 [dependencies]
-git2 = {version = "0.19", default-features = false}
+clap = { version = "4.5.16", features = ["derive"], optional = true }
+git2 = { version = "0.19", default-features = false }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 
+[features]
+default = ["cli"]
+cli = ["clap"]
+
 [dev-dependencies]
 uuid = { version = "1.10.0", features = ["v4"] }

src/bin/yact.rs

@@ -1,6 +1,20 @@
+use std::path::PathBuf;
+
+use clap::Parser;
 use yact::{pre_commit, BuiltinTransformer, ShellCommandTransformer, TransformerOptions};
 
+#[derive(Parser)]
+#[command(version, about)]
+pub struct Args {
+    /*
+     * TODO: add config file and configuration
+     * #[arg(short, long, value_name="CONFIG_FILE")]
+     * config: Option<PathBuf>,
+     */
+}
+
 pub fn main() {
+    let _cli = Args::parse();
     let config = [
         (
             "**/*.rs",