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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;
pub mod cursor;
pub mod linebuf;
pub mod parse;
pub mod raw;
pub mod panic;
use linebuf::LineBuf;
use raw::*;
use crate::cursor::{Direction, move_cursor};
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 run_command(raw: &ScopedRawMode, line: Vec<u8>) {
let parsed = parse::do_parse(&line);
println!("{parsed:?}");
let mut words: Vec<&[u8]> = line.split(|x| *x == b' ').collect();
words.retain(|w| !w.is_empty());
if words.is_empty() {
print!("{PROMPT}");
return;
}
let cmd = words[0];
match cmd {
b"cd" => {
let target: &Path = match words.get(1) {
Some(&b"-") => todo!("prev"),
Some(path) => OsStr::from_bytes(path).as_ref(),
None => todo!("homedir"),
};
if let Err(_) = std::env::set_current_dir(target) {
print!("ERR {PROMPT}");
} else {
print!("{PROMPT}");
}
return;
}
_ => (),
}
let mut cmd = Command::new(OsStr::from_bytes(cmd));
for arg in words[1..].iter() {
cmd.arg(OsStr::from_bytes(arg));
}
raw.disable();
let status = cmd.status();
raw.enable();
let status_string = match status {
Ok(ec) if ec.success() => String::new(),
Ok(ec) => format!("{ec} "),
Err(_) => String::from("IO ERROR "),
};
print!("{status_string}{PROMPT}");
}
fn main() {
crate::panic::hook();
let stdin = io::stdin();
let stdout = io::stdout();
if !stdin.is_terminal() {
println!("need to run in a tty");
return;
}
let fd = stdin.as_raw_fd();
let raw = ScopedRawMode::on_fd(fd);
raw.enable();
let mut stdin = stdin.lock();
let mut stdout = stdout.lock();
let mut buffer = [0u8; 1];
let mut line = LineBuf::new();
let mut history = Vec::new();
print!("{PROMPT}");
loop {
let Ok(_) = stdin.read_exact(&mut buffer) else {
break;
};
match buffer[0] {
// EOF
4 => {
break;
}
// Enter
b'\r' => {
let line = line.dump();
if !line.is_empty() {
print!("\r\n");
history.push(line.clone());
run_command(&raw, line);
}
}
// Backspace (127 on most systems)
127 => {
if line.del_left().is_some() {
print!("\x08 \x08");
}
}
// Escape sequence
27 => {
let mut seq = [0u8; 2];
stdin.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);
line.right();
}
b'D' => {
move_cursor(Direction::Left, 1);
line.left();
}
x => todo!("escape character {x}"),
}
}
}
b'|' if line.is_empty() && !history.is_empty() => {
let mut cmd = history[history.len()-1].clone();
cmd.extend_from_slice(b" | ");
io::stdout().write_all(&cmd).unwrap();
io::stdout().flush().unwrap();
line.set_content(cmd);
}
// Normal character
x => {
line.add(x);
stdout.write_all(&[x]).unwrap();
line.display_post();
}
}
}
raw.disable();
println!("bye");
}
|
