Support both crossterm and termion

Cargo.toml

@@ -7,7 +7,7 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [features]
-default = ["crossterm-backend"]
+default = ["termion-backend"]
 termion-backend = ["tui/termion", "termion"]
 crossterm-backend = ["tui/crossterm", "crossterm"]
 

src/app.rs

@@ -25,8 +25,6 @@ use tui::{
 
 use crate::util::{Key};
 
-use crossterm::event::KeyCode;
-
 pub fn cmp(t1: &Task, t2: &Task) -> Ordering {
     let urgency1 = match &t1.uda()["urgency"] {
         UDAValue::Str(_) => 0.0,

src/util.rs

@@ -1,17 +1,24 @@
-use std::io::{stdout, Write};
-
-#[cfg(feature = "crossterm")]
-use crossterm::event;
 #[cfg(feature = "crossterm")]
 use crossterm::{
-    event::{DisableMouseCapture, EnableMouseCapture, KeyCode},
+    event::{self, DisableMouseCapture, EnableMouseCapture, KeyCode},
     execute,
     terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
 };
-
 #[cfg(feature = "crossterm")]
 use tui::{backend::CrosstermBackend, Terminal};
 
+
+#[cfg(all(feature = "termion", not(feature = "crossterm")))]
+use termion::{
+    event,
+    input::{TermRead,MouseTerminal},
+    raw::{IntoRawMode, RawTerminal},
+    screen::AlternateScreen,
+};
+#[cfg(all(feature = "termion", not(feature = "crossterm")))]
+use tui::{backend::TermionBackend, Terminal};
+
+use std::io::{self, Write};
 use std::{sync::mpsc, thread, time::Duration};
 
 #[derive(Debug, Clone, Copy)]
@@ -49,34 +56,45 @@ impl Default for EventConfig {
   }
 }
 
-/// An occurred event.
+#[derive(Debug, Clone, Copy)]
 pub enum Event<I> {
-  /// An input event occurred.
   Input(I),
-  /// An tick event occurred.
   Tick,
 }
 
 #[cfg(feature = "crossterm")]
-pub fn setup_terminal() -> Terminal<CrosstermBackend<std::io::Stdout>> {
+pub fn setup_terminal() -> Terminal<CrosstermBackend<io::Stdout>> {
     enable_raw_mode().unwrap();
-    let mut stdout = stdout();
+    let mut stdout = io::stdout();
     execute!(stdout, EnterAlternateScreen, EnableMouseCapture).unwrap();
     let backend = CrosstermBackend::new(stdout);
     Terminal::new(backend).unwrap()
 }
 
 #[cfg(feature = "crossterm")]
-pub fn destruct_terminal(mut terminal: Terminal<CrosstermBackend<std::io::Stdout>>) {
+pub fn destruct_terminal(mut terminal: Terminal<CrosstermBackend<io::Stdout>>) {
     disable_raw_mode().unwrap();
-    execute!(stdout(), LeaveAlternateScreen, DisableMouseCapture).unwrap();
+    execute!(io::stdout(), LeaveAlternateScreen, DisableMouseCapture).unwrap();
     terminal.show_cursor().unwrap();
 }
 
 
+#[cfg(all(feature = "termion", not(feature = "crossterm")))]
+pub fn setup_terminal() -> Terminal<TermionBackend<AlternateScreen<MouseTerminal<RawTerminal<io::Stdout>>>>> {
+    let stdout = io::stdout().into_raw_mode().unwrap();
+    let stdout = MouseTerminal::from(stdout);
+    let stdout = AlternateScreen::from(stdout);
+    let backend = TermionBackend::new(stdout);
+    Terminal::new(backend).unwrap()
+}
+
+#[cfg(all(feature = "termion", not(feature = "crossterm")))]
+pub fn destruct_terminal(terminal: Terminal<TermionBackend<AlternateScreen<MouseTerminal<RawTerminal<io::Stdout>>>>> ) {
+}
+
+
 pub struct Events {
   rx: mpsc::Receiver<Event<Key>>,
-  tx: mpsc::Sender<Event<Key>>,
 }
 
 impl Events {
@@ -88,6 +106,7 @@ impl Events {
     })
   }
 
+  #[cfg(feature = "crossterm")]
   pub fn with_config(config: EventConfig) -> Events {
     use crossterm::event::{KeyCode::*, KeyModifiers};
     let (tx, rx) = mpsc::channel();
@@ -130,10 +149,59 @@ impl Events {
         event_tx.send(Event::Tick).unwrap();
       }
     });
-
-    Events { rx, tx }
+    Events { rx }
   }
 
+    #[cfg(all(feature = "termion", not(feature = "crossterm")))]
+    pub fn with_config(config: EventConfig) -> Events {
+        use termion::event::Key::*;
+        let (tx, rx) = mpsc::channel();
+        let input_handle = {
+            let tx = tx.clone();
+            thread::spawn(move || {
+                let stdin = io::stdin();
+                for evt in stdin.keys() {
+                    if let Ok(key) = evt {
+                        let key = match key {
+                            Backspace => Key::Backspace,
+                            Left => Key::Left,
+                            Right => Key::Right,
+                            Up => Key::Up,
+                            Down => Key::Down,
+                            Home => Key::Home,
+                            End => Key::End,
+                            PageUp => Key::PageUp,
+                            PageDown => Key::PageDown,
+                            BackTab => Key::BackTab,
+                            Delete => Key::Delete,
+                            Insert => Key::Insert,
+                            F(c) => Key::F(c),
+                            Char(c) => Key::Char(c),
+                            Alt(c) => Key::Alt(c),
+                            Ctrl(c) => Key::Ctrl(c),
+                            Null => Key::Null,
+                            Esc => Key::Esc,
+                            _ => Key::Null,
+                        };
+                        if let Err(err) = tx.send(Event::Input(key)) {
+                            eprintln!("{}", err);
+                            return;
+                        }
+                    }
+                }
+            })
+        };
+        let tick_handle = {
+            thread::spawn(move || loop {
+                if tx.send(Event::Tick).is_err() {
+                    break;
+                }
+                thread::sleep(config.tick_rate);
+            })
+        };
+        Events {rx}
+    }
+
   /// Attempts to read an event.
   /// This function will block the current thread.
   pub fn next(&self) -> Result<Event<Key>, mpsc::RecvError> {