Fork imapsql-ctl utility from go-imap-sql repo

1. There is only one version for maddy and imapsql-ctl utility.
This prevents confusion about compatibility.

2. Modified imapsql-ctl understands maddy config format, this allows
it to read needed values from it without the need for lengthy commmand
line arguments.

Closes #148.

cmd/imapsql-ctl/utils.go

@@ -0,0 +1,111 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/emersion/go-imap"
+	eimap "github.com/emersion/go-imap"
+)
+
+func FormatAddress(addr *eimap.Address) string {
+	return fmt.Sprintf("%s <%s@%s>", addr.PersonalName, addr.MailboxName, addr.HostName)
+}
+
+func FormatAddressList(addrs []*imap.Address) string {
+	res := make([]string, 0, len(addrs))
+	for _, addr := range addrs {
+		res = append(res, FormatAddress(addr))
+	}
+	return strings.Join(res, ", ")
+}
+
+func Confirmation(prompt string, def bool) bool {
+	selection := "y/N"
+	if def {
+		selection = "Y/n"
+	}
+
+	fmt.Fprintf(os.Stderr, "%s [%s]: ", prompt, selection)
+	if !stdinScnr.Scan() {
+		fmt.Fprintln(os.Stderr, stdinScnr.Err())
+		return false
+	}
+
+	switch stdinScnr.Text() {
+	case "Y", "y":
+		return true
+	case "N", "n":
+		return false
+	default:
+		return def
+	}
+}
+
+func readPass(tty *os.File, output []byte) ([]byte, error) {
+	cursor := output[0:1]
+	readen := 0
+	for {
+		n, err := tty.Read(cursor)
+		if n != 1 {
+			return nil, errors.New("ReadPassword: invalid read size when not in canonical mode")
+		}
+		if err != nil {
+			return nil, errors.New("ReadPassword: " + err.Error())
+		}
+		if cursor[0] == '\n' {
+			break
+		}
+		// Esc or Ctrl+D or Ctrl+C.
+		if cursor[0] == '\x1b' || cursor[0] == '\x04' || cursor[0] == '\x03' {
+			return nil, errors.New("ReadPassword: prompt rejected")
+		}
+		if cursor[0] == '\x7F' /* DEL */ {
+			if readen != 0 {
+				readen--
+				cursor = output[readen : readen+1]
+			}
+			continue
+		}
+
+		if readen == cap(output) {
+			return nil, errors.New("ReadPassword: too long password")
+		}
+
+		readen++
+		cursor = output[readen : readen+1]
+	}
+
+	return output[0:readen], nil
+}
+
+func ReadPassword(prompt string) (string, error) {
+	termios, err := TurnOnRawIO(os.Stdin)
+	hiddenPass := true
+	if err != nil {
+		hiddenPass = false
+		fmt.Fprintln(os.Stderr, "Failed to disable terminal output:", err)
+	}
+	defer TcSetAttr(os.Stdin.Fd(), &termios)
+
+	fmt.Fprintf(os.Stderr, "%s: ", prompt)
+
+	if hiddenPass {
+		buf := make([]byte, 512)
+		buf, err = readPass(os.Stdin, buf)
+		if err != nil {
+			return "", err
+		}
+		fmt.Println()
+
+		return string(buf), nil
+	} else {
+		if !stdinScnr.Scan() {
+			return "", stdinScnr.Err()
+		}
+
+		return stdinScnr.Text(), nil
+	}
+}