Add very rough host lookup functionality.

Currently just based on running host on the machine.

src/main.rs

@@ -113,6 +113,19 @@ fn handle_privmsg(target: &String, message_body: &String, message_obj: &Message,
                 },
                 None => (),
             }
+        } else if inner_message.starts_with("host") {
+            lazy_static! { static ref HOST_REGEX: Regex = Regex::new("(host )(.+)$").unwrap(); }
+            let mut host_target = String::new();
+            match HOST_REGEX.captures(&inner_message) {
+                Some(capture) => {
+                    match capture.at(2) {
+                        Some(target_match) => host_target = String::from(target_match),
+                        None => (),
+                    }
+                    server.send_privmsg(target, &format!("{}: {}", source_nick, &get_host(&host_target))).unwrap();
+                },
+                None => (),                
+            }
         } else if inner_message.starts_with("bot-quit") {
             if server.config().is_owner(source_nick) {
                 std::process::exit(0);
@@ -189,3 +202,8 @@ fn get_stocks(symbol: &String) -> String {
     }
     reply_message
 }
+
+fn get_host(target: &String) -> String {
+    let command = std::process::Command::new("host").arg(target).output().expect("failed to execute process");
+    String::from_utf8_lossy(&command.stdout).into_owned()
+}