notnow 0.3.3

// Copyright (C) 2018-2022 Daniel Mueller (deso@posteo.net)
// SPDX-License-Identifier: GPL-3.0-or-later

use gui::Mergeable;


/// A key as used by the UI.
pub use termion::event::Key;


/// An event as used by the UI.
#[derive(Clone, Debug)]
pub enum Event {
  /// An indication that some component changed and that we should
  /// re-render everything.
  Updated,
  /// An indication that the application should quit.
  Quit,
  /// A key press.
  #[cfg(not(feature = "readline"))]
  Key(Key, ()),
  #[cfg(feature = "readline")]
  Key(Key, Vec<u8>),
}

#[cfg(test)]
impl Event {
  pub fn is_updated(&self) -> bool {
    matches!(self, Self::Updated)
  }
}

impl From<u8> for Event {
  fn from(b: u8) -> Self {
    #[cfg(not(feature = "readline"))]
    {
      Event::Key(Key::Char(char::from(b)), ())
    }
    #[cfg(feature = "readline")]
    {
      Event::Key(Key::Char(char::from(b)), vec![b])
    }
  }
}

impl Mergeable for Event {
  fn merge_with(self, other: Self) -> Self {
    match (&self, &other) {
      (Self::Key(..), _) | (_, Self::Key(..)) => panic!(
        "Attempting to merge incompatible events: {:?} & {:?}",
        self, other
      ),
      (Self::Updated, Self::Updated) => self,
      (Self::Quit, _) | (_, Self::Quit) => Self::Quit,
    }
  }
}