Migrate old ~/.vt.* configuration files to UserConfigDir

vt/main.go

@@ -14,6 +14,7 @@
 package main
 
 import (
+	"fmt"
 	"os"
 	"path"
 
@@ -24,14 +25,34 @@ import (
 
 // initConfig reads in config file and ENV variables if set.
 func initConfig() {
-
 	// Find config directory.
 	configDir, err := os.UserConfigDir()
 	if err == nil {
-		viper.AddConfigPath(path.Join(configDir, "vt-cli"))
-	}
+		configDir = path.Join(configDir, "vt-cli")
+		viper.AddConfigPath(configDir)
+
+		// Migrate old ~/.vt.* configuration files.
+		home, err := os.UserHomeDir()
+		if err == nil {
+			for _, ext := range viper.SupportedExts {
+				oldPath := path.Join(home, ".vt."+ext)
 
-	// Search config in home directory and current directory
+				f, err := os.Open(oldPath)
+				if f != nil {
+					f.Close()
+				}
+				if err != nil {
+					continue
+				}
+
+				newPath := path.Join(configDir, path.Base(oldPath))
+				os.Rename(oldPath, newPath)
+				fmt.Printf("Migrated %s to %s\n", oldPath, newPath)
+			}
+		}
+
+	}
+	// Search config in current directory
 	viper.AddConfigPath(".")
 	// Config file must be named vt + format extension (.toml, .json, etc)
 	viper.SetConfigName("vt")