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use std::os::unix::process::ExitStatusExt as _;
pub mod command;
pub use command::{Child, Command};
type Builtin = &'static (dyn Fn(
&crate::parse::Exe,
&crate::env::Env,
command::Io,
) -> anyhow::Result<command::Child>
+ Sync
+ Send);
#[allow(clippy::as_conversions)]
static BUILTINS: once_cell::sync::Lazy<
std::collections::HashMap<&'static str, Builtin>,
> = once_cell::sync::Lazy::new(|| {
let mut builtins = std::collections::HashMap::new();
builtins.insert("cd", &cd as Builtin);
builtins.insert("echo", &echo);
builtins.insert("and", &and);
builtins.insert("or", &or);
builtins.insert("command", &command);
builtins.insert("builtin", &builtin);
builtins
});
// clippy can't tell that the type is necessary
#[allow(clippy::unnecessary_wraps)]
fn cd(
exe: &crate::parse::Exe,
env: &crate::env::Env,
io: command::Io,
) -> anyhow::Result<command::Child> {
async fn async_cd(
exe: &crate::parse::Exe,
_env: &crate::env::Env,
io: command::Io,
) -> std::process::ExitStatus {
let dir = exe
.args()
.into_iter()
.map(std::convert::AsRef::as_ref)
.next()
.unwrap_or("");
let dir = if dir.is_empty() {
home()
} else if dir.starts_with('~') {
let path: std::path::PathBuf = dir.into();
if let std::path::Component::Normal(prefix) =
path.components().next().unwrap()
{
if prefix.to_str() == Some("~") {
home().join(path.strip_prefix(prefix).unwrap())
} else {
// TODO
io.write_stderr(b"unimplemented\n").await.unwrap();
return async_std::process::ExitStatus::from_raw(1 << 8);
}
} else {
unreachable!()
}
} else {
dir.into()
};
let code = match std::env::set_current_dir(&dir) {
Ok(()) => 0,
Err(e) => {
io.write_stderr(
format!(
"{}: {}: {}\n",
exe.exe(),
crate::format::io_error(&e),
dir.display()
)
.as_bytes(),
)
.await
.unwrap();
1
}
};
async_std::process::ExitStatus::from_raw(code << 8)
}
let exe = exe.clone();
let env = env.clone();
Ok(command::Child::new_fut(async move {
async_cd(&exe, &env, io).await
}))
}
// clippy can't tell that the type is necessary
#[allow(clippy::unnecessary_wraps)]
// mostly just for testing and ensuring that builtins work, i'll likely remove
// this later, since the binary seems totally fine
fn echo(
exe: &crate::parse::Exe,
env: &crate::env::Env,
io: command::Io,
) -> anyhow::Result<command::Child> {
async fn async_echo(
exe: &crate::parse::Exe,
_env: &crate::env::Env,
io: command::Io,
) -> std::process::ExitStatus {
macro_rules! write_stdout {
($bytes:expr) => {
if let Err(e) = io.write_stdout($bytes).await {
io.write_stderr(format!("echo: {}", e).as_bytes())
.await
.unwrap();
return async_std::process::ExitStatus::from_raw(1 << 8);
}
};
}
let count = exe.args().count();
for (i, arg) in exe.args().enumerate() {
write_stdout!(arg.as_bytes());
if i == count - 1 {
write_stdout!(b"\n");
} else {
write_stdout!(b" ");
}
}
async_std::process::ExitStatus::from_raw(0)
}
let exe = exe.clone();
let env = env.clone();
Ok(command::Child::new_fut(async move {
async_echo(&exe, &env, io).await
}))
}
fn and(
exe: &crate::parse::Exe,
env: &crate::env::Env,
io: command::Io,
) -> anyhow::Result<command::Child> {
let exe = exe.shift();
if env.latest_status().success() {
let mut cmd = crate::pipeline::Command::new(&exe);
io.setup_command(&mut cmd);
Ok(command::Child::new_wrapped(cmd.spawn(env)?))
} else {
let env = env.clone();
Ok(command::Child::new_fut(async move { *env.latest_status() }))
}
}
fn or(
exe: &crate::parse::Exe,
env: &crate::env::Env,
io: command::Io,
) -> anyhow::Result<command::Child> {
let exe = exe.shift();
if env.latest_status().success() {
let env = env.clone();
Ok(command::Child::new_fut(async move { *env.latest_status() }))
} else {
let mut cmd = crate::pipeline::Command::new(&exe);
io.setup_command(&mut cmd);
Ok(command::Child::new_wrapped(cmd.spawn(env)?))
}
}
fn command(
exe: &crate::parse::Exe,
env: &crate::env::Env,
io: command::Io,
) -> anyhow::Result<command::Child> {
let exe = exe.shift();
let mut cmd = crate::pipeline::Command::new_binary(&exe);
io.setup_command(&mut cmd);
Ok(command::Child::new_wrapped(cmd.spawn(env)?))
}
fn builtin(
exe: &crate::parse::Exe,
env: &crate::env::Env,
io: command::Io,
) -> anyhow::Result<command::Child> {
let exe = exe.shift();
let mut cmd = crate::pipeline::Command::new_builtin(&exe);
io.setup_command(&mut cmd);
Ok(command::Child::new_wrapped(cmd.spawn(env)?))
}
fn home() -> std::path::PathBuf {
std::env::var_os("HOME").unwrap().into()
}
|
