Add Clap crate and a binary

Date:      Wed May 18 06:34:17 2022 +0200

Cargo.toml

@@ -14,3 +14,4 @@ categories = ["network-programming"]
 
 [dependencies]
 hex = "~0.3"
+clap = { version = "3.1.18", features = ["derive"] }

README.md

@@ -29,3 +29,11 @@ let dst = SocketAddr::from(([255,255,255,255], 9));
 
 wol.send_magic_to(src, dst);
 ```
+
+## Included binary
+
+The binary `bin/wake` may be directly used in scripts:
+
+```
+wake -m 00:11:22:33:44:55
+```

src/bin/wake.rs

@@ -0,0 +1,28 @@
+use clap::Parser;
+
+#[derive(Parser)]
+#[clap(about = "WakeOnLan a device. https://github.com/LesnyRumcajs/wakey.git", long_about = None)]
+struct CmdArgs {
+    /// mac address to send packet to
+    #[clap(short, long)]
+    mac: Option<String>,
+}
+fn main() {
+    let args = CmdArgs::parse();
+    if let Some(m) = args.mac {
+        let mut sep: char = '/';
+        [":", "-"].iter().for_each(|s| {
+            if m.contains(s) {
+                sep = s.chars().next().unwrap();
+            }
+        });
+        let wol = wakey::WolPacket::from_string(&m, sep);
+        if wol.send_magic().is_ok() {
+            println!("sent the magic packet.");
+        } else {
+            println!("failed to send the magic packet.");
+        }
+    } else {
+        println!("give mac address to wake up");
+    }
+}