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use std::io::{Error, ErrorKind};
use std::path::{Path, PathBuf};
#[derive(Debug)]
pub enum Redirect {
Std,
FileOverwrite(String),
FileAppend(String),
}
#[derive(Debug, PartialEq)]
pub enum RunOn {
Always,
ExitSuccess,
ExitFailure,
}
pub enum RunResult {
Command(std::process::ExitStatus),
Builtin,
}
#[derive(Debug)]
pub struct CommandInfo {
pub args: Vec<String>,
pub stdout: Redirect,
pub when: RunOn,
}
impl CommandInfo {
pub fn new() -> CommandInfo {
CommandInfo {
args: Vec::new(),
stdout: Redirect::Std,
when: RunOn::Always,
}
}
pub fn run(
&self,
home: &PathBuf,
cwd: &mut PathBuf,
status: &Option<std::process::ExitStatus>,
) -> Result<RunResult, Error> {
match self.args[0].as_str() {
"!" => {
println!("{:?}", status);
Ok(RunResult::Builtin)
}
"cd" => match cd(&self.args[1..], home) {
Ok(p) => {
*cwd = p;
Ok(RunResult::Builtin)
}
Err(e) => Err(e),
},
"exit" => {
std::process::exit(0);
}
_ => {
let mut child = std::process::Command::new(&self.args[0])
.args(&self.args[1..])
.spawn()?;
Ok(RunResult::Command(child.wait().unwrap()))
}
}
}
}
fn cd(args: &[String], home: &PathBuf) -> Result<PathBuf, Error> {
if args.len() > 1 {
return Err(Error::new(
ErrorKind::InvalidInput,
"Too many arguments passed to cd",
));
}
if args.len() == 0 {
return Ok(home.to_path_buf());
}
let root = match std::fs::canonicalize(Path::new(args[0].as_str())) {
Ok(p) => p,
Err(_) => Path::new("/").to_path_buf(),
};
match std::env::set_current_dir(&root) {
Ok(_) => Ok(root.to_path_buf()),
Err(e) => Err(e),
}
}
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