move connection state to its own file

connection.go

@@ -150,17 +150,17 @@ func (c *Connection) Name() string {
 }
 
 func (c *Connection) RecordScan() {
-	c.Printf("scanning known systems for signs of life\n")
+	c.Printf("Scanning known systems for signs of life\n")
 	c.lastScan = time.Now()
 	time.AfterFunc(options.scanTime, func() {
-		c.Printf("scanner ready\n")
+		c.Printf("Scanner ready\n")
 	})
 }
 
 func (c *Connection) RecordBomb() {
 	c.lastBomb = time.Now()
 	time.AfterFunc(15*time.Second, func() {
-		fmt.Fprintln(c, "bomb arsenal reloaded")
+		fmt.Fprintln(c, "Bomb arsenal reloaded")
 	})
 }
 
@@ -206,27 +206,6 @@ func (c *Connection) Die(frame int64) {
 	c.SetState(NewDeadState(frame))
 }
 
-type ConnectionState interface {
-	CommandSuite
-	String() string
-	FillStatus(*Connection, *status)
-	Enter(c *Connection)
-	Tick(c *Connection, frame int64) ConnectionState
-	Exit(c *Connection)
-}
-
-// No-op enter struct, for composing connection states that have no interesitng
-// Enter mechanic.
-type NopEnter struct{}
-
-func (n NopEnter) Enter(c *Connection) {}
-
-// No-op exit struct, for composing connection states that have no interesting
-// Exit mechanic.
-type NopExit struct{}
-
-func (n NopExit) Exit(c *Connection) {}
-
 func SpawnRandomly() ConnectionState {
 	sys, err := randomSystem()
 	if err != nil {

connection_state.go

@@ -0,0 +1,39 @@
+package main
+
+type ConnectionState interface {
+	// commands available while in this state
+	CommandSuite
+
+	// human-readable description of the state
+	String() string
+
+	// fills a status struct to be printed by the status command. The
+	// ConnectionState only needs to fill in things that are unique to the
+	// state itself, the common things on the connection are filled in
+	// automatically
+	FillStatus(*Connection, *status)
+
+	// Triggered once when the state is entered
+	Enter(c *Connection)
+
+	// Triggered every frame in which the state is the connection's current
+	// state. Returning a different ConnectionState transitions between states.
+	Tick(c *Connection, frame int64) ConnectionState
+
+	// Triggered once when this state has finished for that connection
+	Exit(c *Connection)
+}
+
+// No-op enter struct, for composing connection states that have no interesitng
+// Enter mechanic.
+type NopEnter struct{}
+
+func (n NopEnter) Enter(c *Connection) {}
+
+// No-op exit struct, for composing connection states that have no interesting
+// Exit mechanic.
+type NopExit struct{}
+
+func (n NopExit) Exit(c *Connection) {}
+
+