Add -addr flag, include ability to use unix path

main.go

@@ -1,8 +1,10 @@
 package main
 
 import (
+    "flag"
     "log"
     "net"
+    "strings"
     "time"
 
     "github.com/posteo/go-agentx"
@@ -11,9 +13,21 @@ import (
 )
 
 func main() {
-    client, err := agentx.Dial("tcp", "localhost:705")
+    addr := flag.String("addr", "localhost:705", "Address to connect to (hostname:port or Unix socket path)")
+    flag.Parse()
+
+    var network, address string
+    if strings.HasPrefix(*addr, "/") {
+        network = "unix"
+        address = *addr
+    } else {
+        network = "tcp"
+        address = *addr
+    }
+
+    client, err := agentx.Dial(network, address)
     if err != nil {
-        log.Fatalf("Failed to dial: %v", err)
+        log.Fatalf("Failed to dial %s %s: %v", network, address, err)
     }
     client.Timeout = 1 * time.Minute
     client.ReconnectInterval = 1 * time.Second