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use std::io::Read;
use crate::cursor::Direction;
pub enum KeyboardInput {
Eof,
Key(u8),
CtrlA,
CtrlB,
CtrlC,
CtrlE,
CtrlD,
CtrlL,
CtrlR,
Arrow(Direction),
CtrlArrow(Direction),
DeleteLeft,
DeleteRight,
CtrlDeleteRight,
Home,
End,
}
fn read1() -> Option<u8> {
let mut buf = [0];
match std::io::stdin().lock().read_exact(&mut buf) {
Ok(_) => Some(buf[0]),
Err(_) => None,
}
}
fn byte_to_dir(b: u8) -> Option<Direction> {
use Direction::*;
match b {
b'A' => Some(Up),
b'B' => Some(Down),
b'C' => Some(Right),
b'D' => Some(Left),
_ => None,
}
}
fn read_escape(debug: bool) -> KeyboardInput {
use Direction::*;
use KeyboardInput::*;
let mut seq = vec![match read1() {
Some(x) => x,
None => return Eof,
}];
if seq[0] == b'[' {
// still more
while {
let last = seq[seq.len() - 1];
!(0x40..=0x7E).contains(&last) || seq.len() == 1
} {
seq.push(match read1() {
Some(x) => x,
None => return Eof,
});
}
if debug {
println!("escape: {}", seq.escape_ascii());
}
match seq[1] {
b'3' => {
if seq.len() > 2 && seq[2] == b'~' {
DeleteRight
} else {
todo!("unhandled: {}", seq.escape_ascii());
}
}
b'H' => Home,
b'F' => End,
b'd' => CtrlDeleteRight,
// Ctrl Arrow
b'1' => {
if seq[1..].starts_with(b"1;5") {
if seq.len() == 4 {
todo!("idk what this is.");
}
match seq[4] {
b'A' => CtrlArrow(Up),
b'B' => CtrlArrow(Down),
b'C' => CtrlArrow(Right),
b'D' => CtrlArrow(Left),
_ => todo!("unhandled {}", seq.escape_ascii()),
}
} else {
todo!("unhandled {}", seq[1..].escape_ascii())
}
}
x => {
if let Some(dir) = byte_to_dir(x) {
Arrow(dir)
} else {
todo!("escape characters {}", seq[1..].escape_ascii())
}
}
}
} else {
if debug {
println!("escape: {}", seq.escape_ascii());
}
match seq[0] {
b'd' => CtrlDeleteRight,
x => todo!("unhandled escape code: ESC {x}"),
}
}
}
pub fn read(debug: bool) -> KeyboardInput {
use KeyboardInput::*;
let Some(x) = read1() else {
return KeyboardInput::Eof;
};
match x {
1 => CtrlA,
2 => CtrlB,
3 => CtrlC,
4 => CtrlD,
8 | 127 => DeleteLeft,
12 => CtrlL,
18 => CtrlR,
27 => read_escape(debug),
b'\r' => Key(x),
x if !x.is_ascii_control() => Key(x),
x => todo!("unimplemented control code: {x}"),
}
}
|
