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use std::collections::HashMap;
use std::path::PathBuf;
use crate::parse::Ast;
use crate::*;
mod builtin;
pub fn run(se: &mut Session, cmd: Vec<u8>) {
let parsed = parse::do_parse(&cmd);
let parsed = match parsed {
Ok(p) => p,
Err(err) => {
println!("{cmd:?}");
print!("{err:?}\r\n{}", se.prompt());
return;
}
};
let Ast::Pipes(pipes) = parsed else {
todo!("can only handle pipes");
};
let mut children = Vec::new();
let mut threads = Vec::new();
let mut prev_reader = None;
let mut spawn_error = false;
se.raw.disable();
let pipelen = pipes.cmds.len();
for (i, cmd) in pipes.cmds.into_iter().enumerate() {
let last = i == pipelen - 1;
let (reader, writer) = if !last {
let (r, w) = io::pipe().unwrap();
(Some(r), Some(w))
} else {
(None, None)
};
let dc = se.dispatch.get(&cmd.cmd[..]);
match dc {
CommandKind::Path(path) => {
let mut command = Command::new(&path);
for arg in cmd.args.iter() {
command.arg(OsStr::from_bytes(arg));
}
if let Some(r) = prev_reader.take() {
command.stdin(Stdio::from(r));
}
if let Some(w) = writer {
command.stdout(Stdio::from(w));
}
let child = match command.spawn() {
Ok(c) => c,
Err(e) => {
let cmd = path.to_string_lossy();
let msg = match e.kind() {
io::ErrorKind::NotFound => format!("{cmd} not found"),
io::ErrorKind::PermissionDenied => format!("{cmd} is not executable"),
io::ErrorKind::FileTooLarge => format!("{cmd} is too massive"),
io::ErrorKind::ResourceBusy | io::ErrorKind::ExecutableFileBusy => {
format!("{cmd} is busy")
}
io::ErrorKind::TooManyLinks => format!("{cmd} could not be resolved"),
io::ErrorKind::InvalidFilename => {
format!("{cmd} is not a valid file name")
}
io::ErrorKind::ArgumentListTooLong => format!("too many arguments"),
io::ErrorKind::Interrupted => format!("got interrupted"),
io::ErrorKind::Unsupported => format!("{cmd} is not supported"),
e => format!("I am surprised you can get this error here: {e:?}"),
};
println!("pish: {msg}");
spawn_error = true;
break;
}
};
children.push(child);
}
CommandKind::Builtin(builtin) => {
builtin.mod_session(se, &cmd.args);
let mut input: Box<dyn io::Read + Send> = match prev_reader.take() {
Some(r) => Box::new(r),
None => Box::new(io::stdin()),
};
let mut output: Box<dyn io::Write + Send> = match writer {
Some(w) => Box::new(w),
None => Box::new(io::stdout()),
};
let handle =
std::thread::spawn(move || builtin.io(&cmd.args, &mut input, &mut output));
threads.push(handle);
}
}
prev_reader = reader;
}
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 = "".into();
} else {
let mut code = 0;
for jh in threads {
// TODO do not ignore panics
let _ = jh.join();
}
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}");
}
}
se.raw.enable();
print!("\r{status_string}\r\n{}", se.prompt());
let _ = std::io::stdout().lock().flush();
}
#[allow(unused_variables)]
pub trait Builtin: Send + Sync {
fn name(&self) -> &str;
/// quick synchronous call, `cd` for example
fn mod_session(&self, session: &mut Session, args: &[BString]) {}
/// 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] = &[
&builtin::cd,
&builtin::clear,
#[cfg(debug_assertions)]
&builtin::re,
&builtin::sink("to", false),
&builtin::sink("into", false),
&builtin::sink("append", true),
&builtin::from,
&builtin::builtins,
&builtin::_type,
&builtin::history,
];
pub struct CommandDispatch {
map: HashMap<BString, CommandKind>,
}
impl CommandDispatch {
pub fn new() -> Self {
let mut map = HashMap::new();
// builtins
for &b in BUILTINS {
map.insert(b.name().as_bytes().to_vec(), CommandKind::Builtin(b));
}
Self { map }
}
fn get(&self, cmd: &bstr) -> CommandKind {
let path_cmd = CommandKind::Path(PathBuf::from(OsStr::from_bytes(cmd)));
if cmd.contains(&b'/') {
path_cmd
} else if let Some(cmd) = self.map.get(cmd) {
cmd.clone()
} else {
path_cmd
}
}
}
#[derive(Clone)]
pub enum CommandKind {
Builtin(&'static dyn Builtin),
Path(PathBuf),
}
|
