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|
use std::ffi::OsStr;
use std::io::{self, IsTerminal, Read, Write};
use std::os::unix::ffi::OsStrExt;
use std::os::unix::io::AsRawFd;
use std::path::Path;
use std::process::{Command, Stdio};
pub mod cursor;
pub mod linebuf;
pub mod panic;
pub mod parse;
pub mod raw;
pub mod run;
use linebuf::LineBuf;
use raw::*;
use crate::cursor::{Direction, move_cursor};
use crate::run::CommandDispatch;
macro_rules! print {
($($x:tt)*) => {{
write!(io::stdout(), $($x)*).unwrap();
io::stdout().flush().unwrap();
}}
}
macro_rules! println {
() => {{
println!("")
}};
($($x:tt)*) => {{
write!(io::stdout(), $($x)*).unwrap();
write!(io::stdout(), "\r\n").unwrap();
io::stdout().flush().unwrap();
}};
}
const PROMPT: &str = "> ";
fn completely_clear_screen() {
print!("\x1B[2J\x1B[1;1H");
}
fn clear_screen() {
completely_clear_screen();
print!("{PROMPT}")
}
type BString = Vec<u8>;
#[allow(non_camel_case_types)]
type bstr = [u8];
pub struct Session {
raw: ScopedRawMode,
line: LineBuf,
history: Vec<BString>,
dispatch: CommandDispatch,
}
fn event_loop() {
let stdin = io::stdin();
let stdout = io::stdout();
let fd = stdin.as_raw_fd();
let raw = ScopedRawMode::on_fd(fd);
raw.enable();
let mut se = Session {
raw,
line: LineBuf::new(),
history: Vec::new(),
dispatch: CommandDispatch::new(),
};
print!("{PROMPT}");
loop {
let mut buf = [0u8; 1];
let Ok(_) = stdin.lock().read_exact(&mut buf) else {
break;
};
match buf[0] {
// EOF
4 => {
break;
}
// Ctrl+L
12 => clear_screen(),
// Ctrl+R
18 => {}
// Enter
b'\r' => {
let line = se.line.dump();
if !line.is_empty() {
print!("\r\n");
se.history.push(line.clone());
run::run(&mut se, line);
}
}
// Backspace (127 on most systems)
127 => {
if se.line.is_empty() && !se.line.is_dirty() && !se.history.is_empty() {
// take previous command for editing
let cmd = se.history[se.history.len() - 1].clone();
io::stdout().write_all(&cmd).unwrap();
io::stdout().flush().unwrap();
se.line.set_content(cmd);
} else if se.line.del_left().is_some() {
print!("\x08 \x08");
}
}
b'\t' => {
todo!()
}
// Escape sequence
27 => {
let mut seq = [0u8; 2];
stdin.lock().read_exact(&mut seq).unwrap();
if seq[0] == b'[' {
match seq[1] {
b'A' => {
// up
}
b'B' => {
// down
}
b'C' => {
move_cursor(Direction::Right, 1);
se.line.right();
}
b'D' => {
move_cursor(Direction::Left, 1);
se.line.left();
}
x => todo!("escape character {x}"),
}
}
}
b'|' if se.line.is_empty() && !se.history.is_empty() => {
let mut cmd = se.history[se.history.len() - 1].clone();
cmd.extend_from_slice(b" | ");
io::stdout().write_all(&cmd).unwrap();
io::stdout().flush().unwrap();
se.line.set_content(cmd);
}
// Normal character
x => {
se.line.add(x);
stdout.lock().write_all(&[x]).unwrap();
se.line.display_post();
}
}
}
se.raw.disable();
}
fn main() {
if !io::stdin().is_terminal() {
println!("need to run in a tty");
return;
}
crate::panic::hook();
// it is quite annoying when the terminal window closes due to a crash, so let's just catch all panics
loop {
let res = std::panic::catch_unwind(event_loop);
match res {
Ok(_) => break,
Err(_) => continue,
}
}
println!("bye");
}
|
