chore(cmd): Refactor console output with color package integration.

- Add the `github.com/fatih/color` package import to `cmd/config.go`
- Replace `fmt.Println` with `color.Green` in `cmd/config.go`
- Change the error message in `git/git.go` when there are no differences to "please add your staged changes using git add <files...>"

Author: appleboy

cmd/config.go

@@ -2,10 +2,10 @@ package cmd
 
 import (
 	"errors"
-	"fmt"
 	"strings"
 
 	"github.com/appleboy/com/array"
+	"github.com/fatih/color"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 )
@@ -42,7 +42,7 @@ var configCmd = &cobra.Command{
 		if err := viper.WriteConfig(); err != nil {
 			return err
 		}
-		fmt.Println("you can see the config file:", viper.ConfigFileUsed())
+		color.Green("you can see the config file: %s", viper.ConfigFileUsed())
 		return nil
 	},
 }

git/git.go

@@ -77,7 +77,7 @@ func Diff() (string, error) {
 		log.Fatal(err)
 	}
 	if string(output) == "" {
-		return "", errors.New("nothing output")
+		return "", errors.New("please add your staged changes using git add <files...>")
 	}
 
 	output, err = diffFiles().Output()