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/*
* bb
*
* Copyright 2019 Manos Pitsidianakis
*
* This file is part of bb.
*
* bb is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* bb is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with bb. If not, see <http://www.gnu.org/licenses/>.
*/
use crate::crossbeam::*;
use std::fmt;
use std::io;
use termion::event::Event as TermionEvent;
use termion::event::Key as TermionKey;
use termion::input::TermRead;
#[derive(Debug, PartialEq, Eq, Clone)]
pub enum Key {
/// Backspace.
Backspace,
/// Left arrow.
Left,
/// Right arrow.
Right,
/// Up arrow.
Up,
/// Down arrow.
Down,
/// Home key.
Home,
/// End key.
End,
/// Page Up key.
PageUp,
/// Page Down key.
PageDown,
/// Delete key.
Delete,
/// Insert key.
Insert,
/// Function keys.
///
/// Only function keys 1 through 12 are supported.
F(u8),
/// Normal character.
Char(char),
/// Alt modified character.
Alt(char),
/// Ctrl modified character.
///
/// Note that certain keys may not be modifiable with `ctrl`, due to limitations of terminals.
Ctrl(char),
/// Null byte.
Null,
/// Esc key.
Esc,
Paste(String),
}
impl fmt::Display for Key {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use crate::Key::*;
match self {
F(n) => write!(f, "F{}", n),
Char('\t') => write!(f, "Tab"),
Char('\n') => write!(f, "Enter"),
Char(c) => write!(f, "{}", c),
Alt(c) => write!(f, "M-{}", c),
Ctrl(c) => write!(f, "C-{}", c),
Paste(_) => write!(f, "Pasted buf"),
Null => write!(f, "Null byte"),
Esc => write!(f, "Esc"),
Backspace => write!(f, "Backspace"),
Left => write!(f, "Left"),
Right => write!(f, "Right"),
Up => write!(f, "Up"),
Down => write!(f, "Down"),
Home => write!(f, "Home"),
End => write!(f, "End"),
PageUp => write!(f, "PageUp"),
PageDown => write!(f, "PageDown"),
Delete => write!(f, "Delete"),
Insert => write!(f, "Insert"),
}
}
}
impl<'a> From<&'a String> for Key {
fn from(v: &'a String) -> Self {
Key::Paste(v.to_string())
}
}
impl From<TermionKey> for Key {
fn from(k: TermionKey) -> Self {
match k {
TermionKey::Backspace => Key::Backspace,
TermionKey::Left => Key::Left,
TermionKey::Right => Key::Right,
TermionKey::Up => Key::Up,
TermionKey::Down => Key::Down,
TermionKey::Home => Key::Home,
TermionKey::End => Key::End,
TermionKey::PageUp => Key::PageUp,
TermionKey::PageDown => Key::PageDown,
TermionKey::Delete => Key::Delete,
TermionKey::Insert => Key::Insert,
TermionKey::F(u) => Key::F(u),
TermionKey::Char(c) => Key::Char(c),
TermionKey::Alt(c) => Key::Alt(c),
TermionKey::Ctrl(c) => Key::Ctrl(c),
TermionKey::Null => Key::Null,
TermionKey::Esc => Key::Esc,
_ => Key::Char(' '),
}
}
}
impl PartialEq<Key> for &Key {
fn eq(&self, other: &Key) -> bool {
**self == *other
}
}
#[derive(PartialEq)]
enum InputMode {
Normal,
Paste,
}
/*
* If we fork (for example start $EDITOR) we want the input-thread to stop reading from stdin. The
* best way I came up with right now is to send a signal to the thread that is read in the first
* input in stdin after the fork, and then the thread kills itself. The parent process spawns a new
* input-thread when the child returns.
*
* The main loop uses try_wait_on_child() to check if child has exited.
*/
pub fn get_events(
stdin: io::Stdin,
mut closure: impl FnMut(Key),
rx: &crossbeam::channel::Receiver<bool>,
) {
let mut input_mode = InputMode::Normal;
let mut paste_buf = String::with_capacity(256);
for c in stdin.events() {
select! {
default => {},
recv(rx) -> _ => {
return;
}
};
match c {
Ok(TermionEvent::Key(k)) if input_mode == InputMode::Normal => {
closure(Key::from(k));
}
Ok(TermionEvent::Key(TermionKey::Char(k))) if input_mode == InputMode::Paste => {
paste_buf.push(k);
}
Ok(TermionEvent::Unsupported(ref k)) if k.as_slice() == BRACKET_PASTE_START => {
input_mode = InputMode::Paste;
}
Ok(TermionEvent::Unsupported(ref k)) if k.as_slice() == BRACKET_PASTE_END => {
input_mode = InputMode::Normal;
let ret = Key::from(&paste_buf);
paste_buf.clear();
closure(ret);
}
_ => {} // Mouse events or errors.
}
}
}
/*
* CSI events we use
*/
// Some macros taken from termion:
/// Create a CSI-introduced sequence.
macro_rules! csi {
($( $l:expr ),*) => { concat!("\x1B[", $( $l ),*) };
}
/// Derive a CSI sequence struct.
macro_rules! derive_csi_sequence {
($(#[$outer:meta])*
($name:ident, $value:expr)) => {
$(#[$outer])*
#[derive(Copy, Clone)]
pub struct $name;
impl fmt::Display for $name {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, csi!($value))
}
}
impl AsRef<[u8]> for $name {
fn as_ref(&self) -> &'static [u8] {
csi!($value).as_bytes()
}
}
impl AsRef<str> for $name {
fn as_ref(&self) -> &'static str {
csi!($value)
}
}
};
}
derive_csi_sequence!(
#[doc = "Empty struct with a Display implementation that returns the byte sequence to start [Bracketed Paste Mode](http://www.xfree86.org/current/ctlseqs.html#Bracketed%20Paste%20Mode)"]
(BracketModeStart, "?2004h")
);
derive_csi_sequence!(
#[doc = "Empty struct with a Display implementation that returns the byte sequence to end [Bracketed Paste Mode](http://www.xfree86.org/current/ctlseqs.html#Bracketed%20Paste%20Mode)"]
(BracketModeEnd, "?2003l")
);
pub const BRACKET_PASTE_START: &[u8] = b"\x1B[200~";
pub const BRACKET_PASTE_END: &[u8] = b"\x1B[201~";
|
