Improve: support custom configuration directory

main.go

@@ -4,20 +4,40 @@ import (
 	"os"
 	"os/signal"
 	"syscall"
+	"flag"
+	"path"
 
 	"github.com/Dreamacro/clash/config"
 	"github.com/Dreamacro/clash/hub"
 	"github.com/Dreamacro/clash/proxy"
 	"github.com/Dreamacro/clash/tunnel"
+	C "github.com/Dreamacro/clash/constant"
 
 	log "github.com/sirupsen/logrus"
 )
 
+var (
+	homedir string
+)
+
+func init() {
+	flag.StringVar(&homedir, "d", "", "set configuration directory")
+	flag.Parse()
+}
+
 func main() {
 	tunnel.Instance().Run()
 	proxy.Instance().Run()
 	hub.Run()
 
+	if (homedir != "") {
+		if !path.IsAbs(homedir) {
+			currentDir, _ := os.Getwd()
+			homedir = path.Join(currentDir, homedir)
+		}
+		C.SetHomeDir(homedir)
+	}
+
 	config.Init()
 	err := config.Instance().Parse()
 	if err != nil {