add cmdline flags and some fixes to the IPC layer

backend/ipc/conn_other.go

@@ -3,19 +3,41 @@
 package ipc
 
 import (
+	"fmt"
 	"net"
 	"os"
+	"os/user"
+	"path"
+	"runtime"
 )
 
+var socketPath = "/tmp/supersonic.sock"
+
+func init() {
+	if runtime.GOOS == "darwin" {
+		if home, err := os.UserHomeDir(); err == nil {
+			socketPath = path.Join(home, "Library", "Caches", "supersonic", "supersonic.sock")
+		} else if user, err := user.Current(); err == nil {
+			socketPath = fmt.Sprintf("/tmp/supersonic-%s.sock", user.Name)
+		}
+	} else {
+		if runtime := os.Getenv("XDG_RUNTIME_DIR"); runtime != "" {
+			socketPath = path.Join(runtime, "supersonic.sock")
+		} else if user, err := user.Current(); err == nil {
+			socketPath = fmt.Sprintf("/tmp/supersonic-%s.sock", user.Name)
+		}
+	}
+}
+
 func Dial() (net.Conn, error) {
 	// TODO - use XDG runtime dir, also handle portable mode
-	return net.Dial("unix", "/tmp/supersonic.sock")
+	return net.Dial("unix", socketPath)
 }
 
 func Listen() (net.Listener, error) {
-	return net.Listen("unix", "/tmp/supersonic.sock")
+	return net.Listen("unix", socketPath)
 }
 
 func DestroyConn() error {
-	return os.Remove("/tmp/supersonic.sock")
+	return os.Remove(socketPath)
 }