Add cmdline-flag handling.

For now, just interface settings for the stage control:

```
target/release/hostcontrol --help
Usage: hostcontrol [OPTIONS]

Options:
      --stage-device <STAGE_DEVICE>  Interface to talk to movement stage [default: /dev/ttyACM0]
      --tty-speed <TTY_SPEED>        Speed of the stage device (bps) [default: 115200]
  -h, --help                         Print help
  -V, --version                      Print version
```

Signed-off-by: Henner Zeller <h.zeller@acm.org>

hostcontrol/Cargo.lock

@@ -656,6 +656,46 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "clap"
+version = "4.5.60"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2797f34da339ce31042b27d23607e051786132987f595b02ba4f6a6dffb7030a"
+dependencies = [
+ "clap_builder",
+ "clap_derive",
+]
+
+[[package]]
+name = "clap_builder"
+version = "4.5.60"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24a241312cea5059b13574bb9b3861cabf758b879c15190b37b6d6fd63ab6876"
+dependencies = [
+ "anstream",
+ "anstyle",
+ "clap_lex",
+ "strsim",
+]
+
+[[package]]
+name = "clap_derive"
+version = "4.5.55"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a92793da1a46a5f2a02a6f4c46c6496b28c43638adea8306fcb0caa1634f24e5"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "clap_lex"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3a822ea5bc7590f9d40f1ba12c0dc3c2760f3482c6984db1573ad11031420831"
+
 [[package]]
 name = "clipboard-win"
 version = "5.4.0"
@@ -1443,6 +1483,7 @@ checksum = "dfa686283ad6dd069f105e5ab091b04c62850d3e4cf5d67debad1933f55023df"
 name = "hostcontrol"
 version = "0.1.0"
 dependencies = [
+ "clap",
  "eframe",
  "egui",
  "env_logger",
@@ -2936,6 +2977,12 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6637bab7722d379c8b41ba849228d680cc12d0a45ba1fa2b48f2a30577a06731"
 
+[[package]]
+name = "strsim"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
+
 [[package]]
 name = "strum"
 version = "0.26.3"

hostcontrol/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+clap = { version = "4.0", features = ["derive"] }
 nalgebra = { version = "0.33" }
 serialport = { version = "4", default-features = false }
 thiserror = "2"

hostcontrol/src/main.rs

@@ -1,10 +1,24 @@
 use std::{thread::sleep, time::Duration};
+use clap::Parser;
 
 mod stage;
 
+#[derive(clap::Parser, Debug)]
+#[command(version, about, long_about = None)]
+struct CliArgs {
+    /// Interface to talk to movement stage
+    #[arg(long, default_value="/dev/ttyACM0")]
+    stage_device: String,
+
+    /// Speed of the stage device (bps)
+    #[arg(long, default_value="115200")]
+    tty_speed: u32,
+}
+
 fn main() {
+    let args = CliArgs::parse();
     env_logger::init();
-    let stage_io = stage::StageIO::new("/dev/ttyACM0", 115200).unwrap();
+    let stage_io = stage::StageIO::new(&args.stage_device, args.tty_speed).unwrap();
     let mut s = stage::Stage::new(stage_io, 1.12).unwrap();
     let origin = nalgebra::vector![3000.0, 0.0, -6000.0];
     //println!("{}", s.version().unwrap());