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//! A bad shell -- small cross platform module for writing glue code
use std::{
cell::RefCell,
env,
path::PathBuf,
process::{Command, Stdio},
};
use anyhow::{bail, Context, Result};
macro_rules! _run {
($($expr:expr),*) => {
run!($($expr),*; echo = true)
};
($($expr:expr),* ; echo = $echo:expr) => {
$crate::not_bash::run_process(format!($($expr),*), $echo)
};
}
pub(crate) use _run as run;
pub struct Pushd {
_p: (),
}
pub fn pushd(path: impl Into<PathBuf>) -> Pushd {
Env::with(|env| env.pushd(path.into()));
Pushd { _p: () }
}
impl Drop for Pushd {
fn drop(&mut self) {
Env::with(|env| env.popd())
}
}
#[doc(hidden)]
pub fn run_process(cmd: String, echo: bool) -> Result<String> {
run_process_inner(&cmd, echo).with_context(|| format!("process `{}` failed", cmd))
}
fn run_process_inner(cmd: &str, echo: bool) -> Result<String> {
let cwd = Env::with(|env| env.cwd());
let mut args = shelx(cmd);
let binary = args.remove(0);
if echo {
println!("> {}", cmd)
}
let output = Command::new(binary)
.args(args)
.current_dir(cwd)
.stdin(Stdio::null())
.stderr(Stdio::inherit())
.output()?;
let stdout = String::from_utf8(output.stdout)?;
if echo {
print!("{}", stdout)
}
if !output.status.success() {
bail!("returned non-zero status: {}", output.status)
}
Ok(stdout)
}
// FIXME: some real shell lexing here
fn shelx(cmd: &str) -> Vec<String> {
cmd.split_whitespace().map(|it| it.to_string()).collect()
}
#[derive(Default)]
struct Env {
pushd_stack: Vec<PathBuf>,
}
impl Env {
fn with<F: FnOnce(&mut Env) -> T, T>(f: F) -> T {
thread_local! {
static ENV: RefCell<Env> = Default::default();
}
ENV.with(|it| f(&mut *it.borrow_mut()))
}
fn pushd(&mut self, dir: PathBuf) {
self.pushd_stack.push(dir)
}
fn popd(&mut self) {
self.pushd_stack.pop().unwrap();
}
fn cwd(&self) -> PathBuf {
self.pushd_stack.last().cloned().unwrap_or_else(|| env::current_dir().unwrap())
}
}
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