src: main: Implement commandline arguments parsing

Use clap for argument parsing, read the config file path from the
commandline and implement basic help and version options

src/main.rs

@@ -35,6 +35,17 @@ use crate::{
 use std::sync::{ Arc, Mutex };
 use tracing::{ info, debug };
 
+use clap::Parser;
+
+/// Matrix bot posting when the front door is opened or closed
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+struct Args {
+    /// Configuration file path
+    #[arg(short, long, default_value_t = "config.yml".into())]
+    config: String,
+}
+
 #[derive(PartialEq)]
 enum LolOpenerStatus {
     Open,
@@ -45,7 +56,9 @@ enum LolOpenerStatus {
 async fn main() -> anyhow::Result<()> {
     tracing_subscriber::fmt::init();
 
-    let config = Config::load("config.yml").unwrap_or_else(|e| {
+    let args = Args::parse();
+
+    let config = Config::load(&args.config).unwrap_or_else(|e| {
         panic!("Failed to load config: {e:?}")
     });
     let config = Arc::new(config);