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|
use std::{
env,
ffi::{OsStr, OsString},
io::{self, Write},
os::unix::prelude::{OsStrExt, OsStringExt},
path::{Path, PathBuf},
};
use clap::Parser;
#[derive(Parser, Debug)]
struct Args {
#[arg(long)]
automount_root: PathBuf,
#[arg(long)]
include_interop: bool,
}
const SINGLE_QUOTE: u8 = b'\'';
const DOUBLE_QUOTE: u8 = b'"';
fn shell_escape(s: &OsStr) -> OsString {
// a shameless ripoff of the Python algorithm:
// https://github.com/python/cpython/blob/f1f3af7b8245e61a2e0abef03b2c6c5902ed7df8/Lib/shlex.py#L323
let mut result = Vec::new();
result.push(SINGLE_QUOTE);
for &byte in s.as_bytes() {
result.push(byte);
if byte == SINGLE_QUOTE {
result.push(DOUBLE_QUOTE);
result.push(SINGLE_QUOTE);
result.push(DOUBLE_QUOTE);
result.push(SINGLE_QUOTE);
}
}
result.push(SINGLE_QUOTE);
OsString::from_vec(result)
}
fn build_export(var: &str, paths: &[PathBuf]) -> OsString {
let mut result = OsString::new();
result.push("export ");
result.push(var);
result.push("=");
result.push(shell_escape(
&env::join_paths(paths).expect("paths must be valid"),
));
result.push("\n");
result
}
fn do_split_paths(path: &OsStr, automount_root: &Path, include_interop: bool) -> OsString {
let mut native = vec![];
let mut interop = vec![];
for part in env::split_paths(&path) {
if part.starts_with(automount_root) {
interop.push(part);
} else {
native.push(part);
}
}
if include_interop {
native.extend(interop.clone());
};
let mut result = OsString::new();
result.push(build_export("PATH", &native));
result.push(build_export("WSLPATH", &interop));
result
}
fn main() -> anyhow::Result<()> {
let args = Args::parse();
let path = env::var_os("PATH").expect("PATH is not set, aborting");
io::stdout()
.lock()
.write_all(do_split_paths(&path, &args.automount_root, args.include_interop).as_bytes())?;
Ok(())
}
#[cfg(test)]
mod tests {
use std::{ffi::OsString, path::Path};
use crate::do_split_paths;
#[test]
fn simple() {
assert_eq!(
do_split_paths(
&OsString::from("/good/foo:/bad/foo"),
Path::new("/bad"),
false
),
OsString::from("export PATH='/good/foo'\nexport WSLPATH='/bad/foo'\n")
);
}
#[test]
fn exactly_one() {
assert_eq!(
do_split_paths(&OsString::from("/good/foo"), Path::new("/bad"), true),
OsString::from("export PATH='/good/foo'\nexport WSLPATH=''\n")
);
}
#[test]
fn include_interop() {
assert_eq!(
do_split_paths(
&OsString::from("/good/foo:/bad/foo"),
Path::new("/bad"),
true
),
OsString::from("export PATH='/good/foo:/bad/foo'\nexport WSLPATH='/bad/foo'\n")
);
}
#[test]
fn spicy_escapes() {
assert_eq!(
do_split_paths(
&OsString::from("/good/foo'bar:/bad/foo"),
Path::new("/bad"),
true
),
OsString::from(
"export PATH='/good/foo'\"'\"'bar:/bad/foo'\nexport WSLPATH='/bad/foo'\n"
)
);
}
}
|
