Autodetection of mode via TTY

main.go

@@ -4,6 +4,9 @@ import (
 	"flag"
 	"fmt"
 	"log"
+	"os"
+
+	"github.com/mattn/go-isatty"
 )
 
 func main() {
@@ -12,7 +15,8 @@ func main() {
 	addr := flag.String("a", "61.245.149.58", "address to connect to.")
 	isServer := flag.Bool("s", false, "Set if running the server.")
 	isList := flag.Bool("l", false, "Set if requesting a list")
-	isReceive := flag.Bool("p", false, "Set if receiving a file")
+	isSend := flag.Bool("c", false, "Set if sending a file (copy)")
+	isReceive := flag.Bool("p", false, "Set if receiving a file (paste)")
 
 	flag.Parse()
 
@@ -21,7 +25,27 @@ func main() {
 		s := Server{port: *port}
 		s.Run()
 	} else {
-		c := Client{port: *port, address: *addr, list: *isList, receive: *isReceive}
+		if !*isList && !*isSend && !*isReceive {
+			// try to work out the intent based on whether or not stdin/stdout
+			// are ttys
+			stdinTTY := isatty.IsTerminal(os.Stdin.Fd())
+			stdoutTTY := isatty.IsTerminal(os.Stdout.Fd())
+
+			if stdinTTY && !stdoutTTY {
+				*isReceive = true
+
+			} else if !stdinTTY && stdoutTTY {
+				*isSend = true
+			}
+
+		}
+
+		if !*isList && !*isSend && !*isReceive {
+			// could default to list?
+			*isList = true
+		}
+
+		c := Client{port: *port, address: *addr, list: *isList, send: *isSend, receive: *isReceive}
 		err := c.Connect()
 		if err != nil {
 			fmt.Print(err)