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|
use crate::pipeline::prelude::*;
pub mod command;
pub use command::{Child, Command};
type Builtin = &'static (dyn for<'a> Fn(
crate::parse::Exe,
&'a Env,
command::Io,
) -> anyhow::Result<command::Child<'a>>
+ 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: &Env,
io: command::Io,
) -> anyhow::Result<command::Child> {
async fn async_cd(
exe: crate::parse::Exe,
_env: &Env,
io: command::Io,
) -> std::process::ExitStatus {
macro_rules! bail {
($msg:literal $(,)?) => {
io.write_stderr(format!("cd: {}\n", $msg).as_bytes())
.await
.unwrap();
return std::process::ExitStatus::from_raw(1 << 8);
};
($msg:expr $(,)?) => {
io.write_stderr(format!("cd: {}\n", $msg).as_bytes())
.await
.unwrap();
return std::process::ExitStatus::from_raw(1 << 8);
};
($msg:expr, $($arg:tt)*) => {
io.write_stderr(b"cd: ").await.unwrap();
io.write_stderr(format!($msg, $($arg)*).as_bytes())
.await
.unwrap();
io.write_stderr(b"\n").await.unwrap();
return std::process::ExitStatus::from_raw(1 << 8);
};
}
let dir = exe
.args()
.into_iter()
.map(std::convert::AsRef::as_ref)
.next()
.unwrap_or("");
let dir = if dir.is_empty() {
if let Some(dir) = home(None) {
dir
} else {
bail!("couldn't find current user");
}
} else if dir.starts_with('~') {
let path: std::path::PathBuf = dir.into();
if let std::path::Component::Normal(prefix) =
path.components().next().unwrap()
{
let prefix_bytes = prefix.as_bytes();
let name = if prefix_bytes == b"~" {
None
} else {
Some(std::ffi::OsStr::from_bytes(&prefix_bytes[1..]))
};
if let Some(home) = home(name) {
home.join(path.strip_prefix(prefix).unwrap())
} else {
bail!(
"no such user: {}",
name.map(std::ffi::OsStr::to_string_lossy)
.as_ref()
.unwrap_or(&std::borrow::Cow::Borrowed(
"(deleted)"
))
);
}
} else {
unreachable!()
}
} else {
dir.into()
};
if let Err(e) = std::env::set_current_dir(&dir) {
bail!("{}: {}", crate::format::io_error(&e), dir.display());
}
async_std::process::ExitStatus::from_raw(0)
}
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: &Env,
io: command::Io,
) -> anyhow::Result<command::Child> {
async fn async_echo(
exe: crate::parse::Exe,
_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)
}
Ok(command::Child::new_fut(async move {
async_echo(exe, env, io).await
}))
}
fn and(
mut exe: crate::parse::Exe,
env: &Env,
io: command::Io,
) -> anyhow::Result<command::Child> {
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 status = *env.latest_status();
Ok(command::Child::new_fut(async move { status }))
}
}
fn or(
mut exe: crate::parse::Exe,
env: &Env,
io: command::Io,
) -> anyhow::Result<command::Child> {
exe.shift();
if env.latest_status().success() {
let status = *env.latest_status();
Ok(command::Child::new_fut(async move { 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(
mut exe: crate::parse::Exe,
env: &Env,
io: command::Io,
) -> anyhow::Result<command::Child> {
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(
mut exe: crate::parse::Exe,
env: &Env,
io: command::Io,
) -> anyhow::Result<command::Child> {
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(user: Option<&std::ffi::OsStr>) -> Option<std::path::PathBuf> {
let user = user.map_or_else(
|| users::get_user_by_uid(users::get_current_uid()),
users::get_user_by_name,
);
user.map(|user| user.home_dir().to_path_buf())
}
|
