cli port option and parsing to config

p2p/src/connect.rs

@@ -16,6 +16,7 @@ pub struct Connection<A> where A: io::Read + io::Write {
 
 pub struct Config {
 	magic: Magic,
+	port: u16,
 	services: ServiceFlags,
 	user_agent: String,
 	start_height: i32,

pbtc/cli.yml

@@ -18,4 +18,9 @@ args:
         value_name: IP
         help: Connect to a node to retrieve peer addresses, and disconnect
         takes_value: true
+    - port:
+        long: port
+        value_name: PORT
+        help: Listen for connections on PORT
+        takes_value: true
 

pbtc/main.rs

@@ -16,17 +16,36 @@ use net::common::Magic;
 fn main() {
 	let yaml = load_yaml!("cli.yml");
 	let matches = clap::App::from_yaml(yaml).get_matches();
+	let _cfg = parse(&matches);
+}
 
-	let _magic = match matches.is_present("testnet") {
+struct Config<'a> {
+	magic: Magic,
+	port: u16,
+	connect: Option<&'a str>,
+	seednode: Option<&'a str>,
+}
+
+fn parse<'a>(matches: &'a clap::ArgMatches<'a>) -> Result<Config<'a>, String> {
+	let magic = match matches.is_present("testnet") {
 		true => Magic::Testnet,
 		false => Magic::Mainnet,
 	};
 
-	if let Some(ip) = matches.value_of("connect") {
-		println!("Connecting to ip: {}", ip);
-	}
+	let port = match matches.value_of("port") {
+		Some(port) => try!(port.parse().map_err(|_| "Invalid port".to_owned())),
+		None => match magic {
+			Magic::Mainnet => 8333,
+			Magic::Testnet => 18333,
+		},
+	};
 
-	if let Some(ip) = matches.value_of("seednode") {
-		println!("Seednode ip: {}", ip);
-	}
+	let config = Config {
+		magic: magic,
+		port: port,
+		connect: matches.value_of("connect"),
+		seednode: matches.value_of("seednode"),
+	};
+
+	Ok(config)
 }