refactor: refactor configuration handling across files

- Remove unnecessary import of `fmt`
- Refactor the assignment of `config` flag to use a multi-line format
- Bind the `config` flag to `viper` for persistent flags
- Remove redundant code related to reading config file and environment variables

Signed-off-by: Sean Zheng <[email protected]>

cmd/root.go

@@ -1,7 +1,6 @@
 package cmd
 
 import (
-	"fmt"
 	"os"
 
 	"github.com/spf13/cobra"
@@ -35,7 +34,13 @@ func init() {
 	// Cobra supports persistent flags, which, if defined here,
 	// will be global for your application.
 
-	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.config/ryze/.ryze.yaml)")
+	rootCmd.PersistentFlags().StringVar(
+		&cfgFile,
+		"config",
+		"",
+		"config file (default is $HOME/.config/ryze/.ryze.yaml)",
+	)
+	_ = viper.BindPFlag("config", rootCmd.PersistentFlags().Lookup("config"))
 
 	// Cobra also supports local flags, which will only run
 	// when this action is called directly.
@@ -44,24 +49,4 @@ func init() {
 
 // initConfig reads in config file and ENV variables if set.
 func initConfig() {
-	if cfgFile != "" {
-		// Use config file from the flag.
-		viper.SetConfigFile(cfgFile)
-	} else {
-		// Find home directory.
-		home, err := os.UserHomeDir()
-		cobra.CheckErr(err)
-
-		// Search config in home directory with name ".ryze" (without extension).
-		viper.AddConfigPath(home)
-		viper.SetConfigType("yaml")
-		viper.SetConfigName(".ryze")
-	}
-
-	viper.AutomaticEnv() // read in environment variables that match
-
-	// If a config file is found, read it in.
-	if err := viper.ReadInConfig(); err == nil {
-		fmt.Fprintln(os.Stderr, "Using config file:", viper.ConfigFileUsed())
-	}
 }