cli

Cargo.toml

@@ -33,6 +33,7 @@ console_error_panic_hook = { version = "0.1.6", optional = true }
 # Unfortunately, `wee_alloc` requires nightly Rust when targeting wasm for now.
 wee_alloc = { version = "0.4.5", optional = true }
 pretty_assertions = "1.2.1"
+clap = { version = "3.1.9", features = ["derive"] }
 
 [dev-dependencies]
 wasm-bindgen-test = "0.3.13"

src/cut.rs

@@ -1,15 +1,21 @@
+use clap::Parser;
 use democutter::cut;
-use std::env;
 use std::fs;
 
+#[derive(Parser, Debug)]
+#[clap(author, version, about, long_about = None)]
+struct Args {
+    /// Path to the source demo
+    path: String,
+    /// Start tick
+    start: u32,
+    /// End tick
+    end: Option<u32>,
+}
+
 fn main() {
-    let args: Vec<_> = env::args().collect();
-    if args.len() < 2 {
-        println!("1 argument required");
-        return;
-    }
-    let path = args[1].clone();
-    let file = fs::read(path).unwrap();
-    let output = cut(&file, 30000, 50000);
+    let args = Args::parse();
+    let file = fs::read(&args.path).unwrap();
+    let output = cut(&file, args.start, args.end.unwrap_or(u32::MAX));
     fs::write("out.dem", output).unwrap();
 }