Add command to initialize client-config

config/config.go

@@ -3,8 +3,10 @@ package config
 import (
 	"crypto/tls"
 	"crypto/x509"
+	"errors"
 	"fmt"
 	"io"
+	"io/fs"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -171,5 +173,42 @@ func (cc *ClientConfig) Creds() (credentials.TransportCredentials, error) {
 		RootCAs:      certPool,
 	}
 	return credentials.NewTLS(config), nil
-
+}
+
+func (c *Config) ToDefaultFile() error {
+	userConfigDir, err := os.UserConfigDir()
+	if err != nil {
+		return err
+	}
+	configDirPath := filepath.Join(userConfigDir, "ezshare")
+	info, err := os.Stat(configDirPath)
+	if err != nil {
+		if !errors.Is(err, fs.ErrNotExist) {
+			return err
+		}
+		if err := os.Mkdir(configDirPath, 0755); err != nil {
+			return fmt.Errorf("unable to create config-dir: %w", err)
+		}
+	} else {
+		if !info.IsDir() {
+			return fmt.Errorf("config-directory is not a directory")
+		}
+	}
+
+	configFilePath := filepath.Join(configDirPath, "ezshare.toml")
+	_, err = os.Stat(configFilePath)
+	if err != nil {
+		if !errors.Is(err, fs.ErrNotExist) {
+			return fmt.Errorf("error stating config-file: %w", err)
+		}
+
+		f, err := os.Create(configFilePath)
+		if err != nil {
+			return fmt.Errorf("unable to create config-file: %w", err)
+		}
+		encoder := toml.NewEncoder(f)
+		fmt.Printf("Writing config to '%s'", configFilePath)
+		return encoder.Encode(c)
+	}
+	return fmt.Errorf("config-file already exists")
 }