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use std::collections::HashMap;
use std::fs;
use std::os::unix::fs::PermissionsExt;
use std::path::PathBuf;
use crate::parse::Ast;
use crate::*;
pub fn run(se: &Session, cmd: Vec<u8>) {
run_command(&se.raw, cmd);
}
pub trait Builtin : Send + Sync {
fn name(&self) -> & str;
/// quick synchronous call, `cd` for example
fn mod_session(&self, session: &mut Session) {}
/// potentially long, pipelineable thread, builtin `cat` for example
fn io(
&self,
args: &[BString],
stdin: &mut dyn Read,
stdout: &mut dyn Write,
) -> std::io::Result<()> {
Ok(())
}
}
const BUILTINS: &[&'static dyn Builtin] = &[];
pub struct CommandDispatch {
map: HashMap<BString, CommandKind>,
}
impl CommandDispatch {
fn new() -> Self {
let mut map = HashMap::new();
// all the commands from PATH
let path = std::env::var_os("PATH").unwrap();
for p in path.as_bytes().split(|x| *x == b':').rev() {
let p = PathBuf::from(OsStr::from_bytes(p));
let Ok(entries) = fs::read_dir(p) else {
continue;
};
for entry in entries {
let Ok(entry) = entry else { continue };
let Ok(meta) = entry.metadata() else {
continue;
};
if !meta.is_file() {
continue;
}
let perms = meta.permissions();
let mode = perms.mode();
// Check if any execute bit is set (owner/group/other)
if mode & 0o111 == 0 {
continue;
}
// insert into our command map, mind the .rev() on the iterator above s.t. correct precedence is had
map.insert(
entry.file_name().as_bytes().to_vec(),
CommandKind::Path(entry.path()),
);
}
}
// builtins
for &b in BUILTINS {
map.insert(b.name().as_bytes().to_vec(), CommandKind::Builtin(b));
}
todo!()
}
fn get(&self, cmd: &bstr) -> Option<CommandKind> {
if cmd.starts_with(b"/") || cmd.starts_with(b"./") {
Some(CommandKind::Path(PathBuf::from(OsStr::from_bytes(cmd))))
} else {
self.map.get(cmd).cloned()
}
}
}
#[derive(Clone)]
pub enum CommandKind {
Builtin(&'static dyn Builtin),
Path(PathBuf),
}
fn run_command(raw: &ScopedRawMode, line: Vec<u8>) {
let parsed = parse::do_parse(&line);
let parsed = match parsed {
Ok(p) => p,
Err(err) => {
println!("{line:?}");
print!("{err:?}\r\n{PROMPT}");
return;
}
};
let Ast::Pipes(pipes) = parsed else {
todo!("can only handle pipes");
};
// simple command that can probably be builtin
// TODO: handle builtins uniformly instead of big if case
if pipes.cmds.len() == 1 {
let c = &pipes.cmds[0];
match &c.cmd[..] {
b"cd" => {
let target: &Path = match c.args.get(0).map(|v| &v[..]) {
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;
}
b"clear" => clear_screen(),
#[cfg(debug_assertions)]
b"re" => {
// restart shell
raw.disable();
let _ = Command::new("cargo").arg("run").status();
raw.disable();
std::process::exit(0);
}
b"from" => todo!("read from file"),
b"to" | b"into" => todo!("write into file"),
b"append" => todo!("append to file"),
_ => (),
}
}
let mut children: Vec<Child> = Vec::new();
let mut prev_stdout = None;
let mut spawn_error = false;
raw.disable();
for (i, cmd) in pipes.cmds.iter().enumerate() {
let mut command = Command::new(OsStr::from_bytes(&cmd.cmd));
for arg in cmd.args.iter() {
command.arg(OsStr::from_bytes(arg));
}
if let Some(stdout) = prev_stdout.take() {
command.stdin(Stdio::from(stdout));
}
if i < pipes.cmds.len() - 1 {
command.stdout(Stdio::piped());
}
let mut child = match command.spawn() {
Ok(c) => c,
Err(e) => {
println!("failed to spawn {:?} - {e:?}", OsStr::from_bytes(&cmd.cmd));
spawn_error = true;
break;
}
};
prev_stdout = child.stdout.take();
children.push(child);
}
let status_string;
if spawn_error {
for child in children.iter_mut() {
if let Err(e) = child.kill() {
println!("failed to kill child - {e:?}");
}
}
status_string = "ERR".into();
} else {
let mut code = 0;
for mut child in children {
match child.wait() {
Ok(ec) => {
if let Some(c) = ec.code() {
code = c;
}
}
Err(e) => {
println!("failed to wait for child - {e:?}")
}
}
}
if code == 0 {
status_string = String::new();
} else {
status_string = format!("{code}");
}
}
raw.enable();
print!("\r{status_string}{PROMPT}");
}
|
