You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: gpg_helper.go
    path of file: ./repos/lazygit/pkg/gui/controllers/helpers
    
    the code of the file until where you have to start completion: package helpers

import (
	"fmt"

	"github.com/jesseduffield/gocui"
	"github.com/jesseduffield/lazygit/pkg/commands/oscommands"
	"github.com/jesseduffield/lazygit/pkg/gui/types"
)

type GpgHelper struct {
	c *HelperCommon
}

func NewGpgHelper(c *HelperCommon) *GpgHelper {
	return &GpgHelper{
		c: c,
	}
}

// Currently there is a bug where if we switch to a subprocess from within
// WithWaitingStatus we get stuck there and can't return to lazygit. We could
// fix this bug, or just stop running subprocesses from within there, given
    
func (self *GpgHelper) runAndStream(cmdObj oscommands.ICmdObj, waitingStatus string, onSuccess func() error) error {
	return self.c.WithWaitingStatus(waitingStatus, func(gocui.Task) error {
		if err := cmdObj.StreamOutput().Run(); err != nil {
			_ = self.c.Refresh(types.RefreshOptions{Mode: types.ASYNC})
			return self.c.Error(
				fmt.Errorf(
					self.c.Tr.GitCommandFailed, self.c.UserConfig.Keybinding.Universal.ExtrasMenu,
				),
			)
		}

		if onSuccess != nil {
			if err := onSuccess(); err != nil {
				return err
			}
		}

		return self.c.Refresh(types.RefreshOptions{Mode: types.ASYNC})
	})
}