Feature: can set specify config file path in cli (#360)

constant/path.go

@@ -11,32 +11,38 @@ const Name = "clash"
 var Path *path
 
 type path struct {
-	homedir string
+	homeDir    string
+	configFile string
 }
 
 func init() {
-	homedir, err := os.UserHomeDir()
+	homeDir, err := os.UserHomeDir()
 	if err != nil {
-		homedir, _ = os.Getwd()
+		homeDir, _ = os.Getwd()
 	}
 
-	homedir = P.Join(homedir, ".config", Name)
-	Path = &path{homedir: homedir}
+	homeDir = P.Join(homeDir, ".config", Name)
+	Path = &path{homeDir: homeDir, configFile: "config.yaml"}
 }
 
 // SetHomeDir is used to set the configuration path
 func SetHomeDir(root string) {
-	Path = &path{homedir: root}
+	Path.homeDir = root
+}
+
+// SetConfig is used to set the configuration file
+func SetConfig(file string) {
+	Path.configFile = file
 }
 
 func (p *path) HomeDir() string {
-	return p.homedir
+	return p.homeDir
 }
 
 func (p *path) Config() string {
-	return P.Join(p.homedir, "config.yaml")
+	return p.configFile
 }
 
 func (p *path) MMDB() string {
-	return P.Join(p.homedir, "Country.mmdb")
+	return P.Join(p.homeDir, "Country.mmdb")
 }

main.go

@@ -17,12 +17,14 @@ import (
 )
 
 var (
-	version bool
-	homedir string
+	version    bool
+	homeDir    string
+	configFile string
 )
 
 func init() {
-	flag.StringVar(&homedir, "d", "", "set configuration directory")
+	flag.StringVar(&homeDir, "d", "", "set configuration directory")
+	flag.StringVar(&configFile, "f", "", "specify configuration file")
 	flag.BoolVar(&version, "v", false, "show current version of clash")
 	flag.Parse()
 }
@@ -33,12 +35,23 @@ func main() {
 		return
 	}
 
-	if homedir != "" {
-		if !filepath.IsAbs(homedir) {
+	if homeDir != "" {
+		if !filepath.IsAbs(homeDir) {
 			currentDir, _ := os.Getwd()
-			homedir = filepath.Join(currentDir, homedir)
+			homeDir = filepath.Join(currentDir, homeDir)
 		}
-		C.SetHomeDir(homedir)
+		C.SetHomeDir(homeDir)
+	}
+
+	if configFile != "" {
+		if !filepath.IsAbs(configFile) {
+			currentDir, _ := os.Getwd()
+			configFile = filepath.Join(currentDir, configFile)
+		}
+		C.SetConfig(configFile)
+	} else {
+		configFile := filepath.Join(C.Path.HomeDir(), C.Path.Config())
+		C.SetConfig(configFile)
 	}
 
 	if err := config.Init(C.Path.HomeDir()); err != nil {