added back in teh broadcast funciton

commands.go

@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"sort"
+	"strings"
 )
 
 var commandRegistry map[string]*Command
@@ -92,6 +93,26 @@ var scanCommand = &Command{
 	},
 }
 
+var broadcastCommand = &Command{
+	name: "broadcast",
+	help: "broadcast a message for all systems to hear",
+	handler: func(conn *Connection, args ...string) {
+		msg := strings.Join(args, " ")
+		system := conn.System()
+		log_info("broadcast sent from %s: %v\n", system.name, msg)
+		for id, _ := range index {
+			if id == system.id {
+				continue
+			}
+			delay := system.TimeTo(index[id])
+			id2 := id
+			After(delay, func() {
+				deliverMessage(id2, system.id, msg)
+			})
+		}
+	},
+}
+
 func isCommand(name string) bool {
 	_, ok := commandRegistry[name]
 	return ok

system.go

@@ -194,3 +194,11 @@ func deliverReply(id int, echo int, results *scanResults) {
 		fmt.Fprintf(conn, "scan results from %s (%v away): %v\n", source.name, delay, results)
 	})
 }
+
+func deliverMessage(to_id, from_id int, msg string) {
+	to := index[to_id]
+	from := index[from_id]
+	to.EachConn(func(conn *Connection) {
+		fmt.Fprintf(conn, "Message from %s: %s", from.name, msg)
+	})
+}