Fixing to have the proper version of go-imap from foxcpp.

command.go

@@ -0,0 +1,57 @@
+package imap
+
+import (
+	"errors"
+	"strings"
+)
+
+// A value that can be converted to a command.
+type Commander interface {
+	Command() *Command
+}
+
+// A command.
+type Command struct {
+	// The command tag. It acts as a unique identifier for this command. If empty,
+	// the command is untagged.
+	Tag string
+	// The command name.
+	Name string
+	// The command arguments.
+	Arguments []interface{}
+}
+
+// Implements the Commander interface.
+func (cmd *Command) Command() *Command {
+	return cmd
+}
+
+func (cmd *Command) WriteTo(w *Writer) error {
+	tag := cmd.Tag
+	if tag == "" {
+		tag = "*"
+	}
+
+	fields := []interface{}{tag, cmd.Name}
+	fields = append(fields, cmd.Arguments...)
+	return w.writeLine(fields...)
+}
+
+// Parse a command from fields.
+func (cmd *Command) Parse(fields []interface{}) error {
+	if len(fields) < 2 {
+		return errors.New("imap: cannot parse command: no enough fields")
+	}
+
+	var ok bool
+	if cmd.Tag, ok = fields[0].(string); !ok {
+		return errors.New("imap: cannot parse command: invalid tag")
+	}
+	if cmd.Name, ok = fields[1].(string); !ok {
+		return errors.New("imap: cannot parse command: invalid name")
+	}
+	cmd.Name = strings.ToUpper(cmd.Name) // Command names are case-insensitive
+
+	cmd.Arguments = fields[2:]
+	return nil
+}