How to implement isSubmiting about react-reformed HOT 2 CLOSED

// imagine your `login` state looks (something) like this:
{
  hasPendingLogin: boolean,
  isAuthenticated: boolean,
  user: ?Object,
}

// then you can just select that pending login state, since that would be tied to your login action
export default compose(
  connect(
    state => ({
      initialModel: {...},
      isSubmitting: state.session.hasPendingLogin,
    }), {
      onSubmit: login
    }
  ),
  reformed()
)(LoginForm)

// Note: I wrote this directly in github, so there could easily be a syntax error somewhere
const submittable = (WrappedComponent) => {
  return class SubmittableComponent extends React.Component {
    state = {
      isSubmitting: false,
    }

    // we assume that `this.props.onSubmit` is a function that returns a
    // promise. We can proxy the call to that function so that we can hook
    // into the promise to set a loading state.
    _onSubmit = (model) => {
      this.setState({ isSubmitting: true })
      return this.props.onSubmit(model)
        .then((res) => {
          this.setState({ isSubmitting: false })
          return res
        })
        .catch((err) => {
          this.setState({ isSubmitting: false })
          throw err // re-throw so anybody handling this sees it fail correctly
        })
    }

    render () {
      return React.createElement(WrappedComponent, {
        ...this.props,
        // we proxy `this.props.onSubmit`
        onSubmit: this._onSubmit,
        isSubmitting: this.state.isSubmitting,
      })
    }
  }
}

export default compose(
  connect(
    state => ({
      initialModel: {...},
    }), {
      onSubmit: login
    }
  ),
  submittable,   // <---------------
  reformed()
)(LoginForm

// form reducer //
export const initialState = null
export default handleActions({
  [SET_FORM_SUBMITING]: (state, { payload }) => payload,
  [CLEAR_FORM_SUBMITING]: () => null
}, initialState)
// selectors //
export const isLoginFormSubmiting = state => state === 'loginForm'
export const isRegisterFormSubmiting = state => state === 'registerForm'
// etc...