refactoring of code to make it more readable

.gitignore

@@ -3,3 +3,4 @@ logs
 msgs
 config.yaml
 go.sum
+.vscode

config.go

@@ -10,23 +10,20 @@ import (
 // Config application configuration
 type Config struct {
 	Path    string `yaml:"path"`
-	Account []struct {
-		Addr     string `yaml:"addr"`
-		Username string `yaml:"username"`
-		Password string `yaml:"password"`
-	}
-	Proxy struct {
-		Enabled bool   `yaml:"enabled"`
-		Addr    string `yaml:"addr"`
-		Proto   string `yaml:"proto"`
-	}
-	Logger struct {
+	Account []Account
+	Logger  struct {
 		Path  string `yaml:"path"`
 		Mode  string `yaml:"mode"`
 		Level int    `yaml:"level"`
 	}
 }
 
+type Account struct {
+	Addr     string `yaml:"addr"`
+	Username string `yaml:"username"`
+	Password string `yaml:"password"`
+}
+
 // NewConfig - create new config instance from file path
 func NewConfig(configFile string) (config *Config) {
 	file, err := ioutil.ReadFile(configFile)

mail/mail.go

@@ -44,11 +44,7 @@ func LoginWithProxy(conn Conn, network string, proxyAddress string, auth *proxy.
 	if err != nil {
 		return nil, err
 	}
-	mail, err = login(conn, client)
-	if err != nil {
-		return nil, err
-	}
-	return mail, nil
+	return login(conn, client)
 }
 
 func Login(conn Conn) (mail *Mail, err error) {
@@ -56,11 +52,7 @@ func Login(conn Conn) (mail *Mail, err error) {
 	if err != nil {
 		return nil, err
 	}
-	mail, err = login(conn, client)
-	if err != nil {
-		return nil, err
-	}
-	return mail, nil
+	return login(conn, client)
 }
 
 func (mail *Mail) ListMailboxes() {
@@ -109,10 +101,7 @@ func (mail *Mail) GetMessages(mailbox string, path string) error {
 			return err
 		}
 	}
-	if err := <-done; err != nil {
-		return err
-	}
-	return nil
+	return <-done
 }
 
 func Write(path string, msg *imap.Message, literal imap.Literal) error {

main.go

@@ -13,53 +13,37 @@ import (
 func main() {
 	cfgFile, mailbox, list := ui()
 	cfg := NewConfig(*cfgFile)
-	chErr, chDone := make(chan error), make(chan bool)
+	ch := make(chan error)
 	for _, account := range cfg.Account {
-		go func(addr, username, password string, chErr chan<- error, chDone chan<- bool) {
-			defer func() {
-				chDone <- true
-			}()
-			auth := mail.Conn{Addr: addr, Username: username, Password: password}
-			var conn *mail.Mail
-			var err error
-			if cfg.Proxy.Enabled {
-				conn, err = mail.LoginWithProxy(auth, cfg.Proxy.Proto, cfg.Proxy.Addr, nil)
-				if err != nil {
-					chErr <- err
-				}
-			} else {
-				conn, err = mail.Login(auth)
-				if err != nil {
-					chErr <- err
-				}
-			}
-			defer conn.Client.Logout()
-
-			if !*list {
-				path := cfg.Path + username + "/" + time.Now().Format("2006-01-02-15:04:05")
-				for _, p := range []string{cfg.Path + username, path} {
-					if _, err := os.Stat(p); os.IsNotExist(err) {
-						os.Mkdir(p, 0775)
-					}
-				}
-				if err = conn.GetMessages(*mailbox, path); err != nil {
-					chErr <- err
-				}
-				return
-			}
-			conn.ListMailboxes()
-		}(account.Addr, account.Username, account.Password, chErr, chDone)
+		go getmail(account, cfg.Path, *mailbox, *list, ch)
 	}
-	for c := 0; c < len(cfg.Account); {
-		select {
-		case err := <-chErr:
-			log.Println(err)
-		case <-chDone:
-			c++
+	for c := 0; c < len(cfg.Account); c++ {
+		if <-ch != nil {
+			log.Println(<-ch)
 		}
 	}
 }
 
+func getmail(account Account, ph, mailbox string, list bool, ch chan error) {
+	conn, err := mail.Login(mail.Conn{Addr: account.Addr, Username: account.Username, Password: account.Password})
+	if err != nil {
+		ch <- err
+		return
+	}
+	defer conn.Client.Logout()
+	if !list {
+		path := ph + account.Username + "/" + time.Now().Format("2006-01-02-15:04:05")
+		makePath(ph+account.Username, path)
+		if err = conn.GetMessages(mailbox, path); err != nil {
+			ch <- err
+		}
+		ch <- nil
+		return
+	}
+	conn.ListMailboxes()
+	ch <- nil
+}
+
 func ui() (cfgFile, mailbox *string, list *bool) {
 	flag.Usage = func() {
 		fmt.Printf("Usage of %s:\n", os.Args[0])
@@ -76,3 +60,11 @@ func ui() (cfgFile, mailbox *string, list *bool) {
 	flag.Parse()
 	return cfgFile, mailbox, list
 }
+
+func makePath(paths ...string) {
+	for _, p := range paths {
+		if _, err := os.Stat(p); os.IsNotExist(err) {
+			os.Mkdir(p, 0775)
+		}
+	}
+}