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pub fn is(exe: &str) -> bool {
matches!(exe, "cd")
}
pub fn run(exe: &str, args: &[String]) -> u8 {
match exe {
"cd" => {
impls::cd(args.iter().map(|s| s.as_ref()).next().unwrap_or(""))
}
_ => unreachable!(),
}
}
mod impls {
pub fn cd(dir: &str) -> u8 {
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
return 1;
}
} else {
unreachable!()
}
} else {
dir.into()
};
match std::env::set_current_dir(dir) {
Ok(()) => 0,
Err(_) => 1,
}
}
fn home() -> std::path::PathBuf {
std::env::var_os("HOME").unwrap().into()
}
}
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