Activate on startup (#70)

Frontends are now properly synced among each other and on startup the correct state is reflected.

Closes #75 
Closes #68

src/client.rs

@@ -46,6 +46,20 @@ impl Display for Position {
     }
 }
 
+impl TryFrom<&str> for Position {
+    type Error = ();
+
+    fn try_from(s: &str) -> Result<Self, Self::Error> {
+        match s {
+            "left" => Ok(Position::Left),
+            "right" => Ok(Position::Right),
+            "top" => Ok(Position::Top),
+            "bottom" => Ok(Position::Bottom),
+            _ => Err(()),
+        }
+    }
+}
+
 #[derive(Debug, Eq, PartialEq, Clone, Serialize, Deserialize)]
 pub struct Client {
     /// hostname of this client
@@ -112,6 +126,7 @@ impl ClientManager {
         ips: HashSet<IpAddr>,
         port: u16,
         pos: Position,
+        active: bool,
     ) -> ClientHandle {
         // get a new client_handle
         let handle = self.free_id();
@@ -135,7 +150,7 @@ impl ClientManager {
         // client was never seen, nor pinged
         let client_state = ClientState {
             client,
-            active: false,
+            active,
             active_addr: None,
             alive: false,
             pressed_keys: HashSet::new(),