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use std::io::{Error, ErrorKind};
use std::path::{Path, PathBuf};
use std::process::{Command, ExitStatus};
#[derive(Debug)]
pub(in crate::parser) enum Redirect {
Std,
FileOverwrite(String),
FileAppend(String),
}
#[derive(Debug, PartialEq)]
pub(in crate::parser) enum RunOn {
Always,
ExitSuccess,
ExitFailure,
}
pub enum RunResult {
Command(ExitStatus),
Builtin,
}
#[derive(Debug)]
pub struct CommandInfo {
pub(in crate::parser) args: Vec<String>,
pub(in crate::parser) stdout: Redirect,
pub(in crate::parser) when: RunOn,
}
impl CommandInfo {
pub(in crate::parser) fn new() -> CommandInfo {
CommandInfo {
args: Vec::new(),
stdout: Redirect::Std,
when: RunOn::Always,
}
}
pub fn run(&self, home: &PathBuf, status: &Option<ExitStatus>) -> Result<RunResult, Error> {
match self.args[0].as_str() {
"!" => {
println!("{:?}", status);
Ok(RunResult::Builtin)
}
"cd" => cd(&self.args[1..], home),
"exit" => {
std::process::exit(0);
}
"set" => set(&self.args[1..]),
"unset" => unset(&self.args[1..]),
_ => {
let mut child = Command::new(&self.args[0]).args(&self.args[1..]).spawn()?;
Ok(RunResult::Command(child.wait().unwrap()))
}
}
}
}
fn cd(args: &[String], home: &PathBuf) -> Result<RunResult, Error> {
if args.len() > 1 {
return Err(Error::new(
ErrorKind::InvalidInput,
"Too many arguments passed to cd",
));
}
let root = if args.len() == 0 {
home.to_path_buf()
} else {
std::fs::canonicalize(Path::new(args[0].as_str()))?
};
match std::env::set_current_dir(&root) {
Ok(_) => Ok(RunResult::Builtin),
Err(e) => Err(e),
}
}
fn set(args: &[String]) -> Result<RunResult, Error> {
if args.len() != 2 {
return Err(Error::new(
ErrorKind::InvalidInput,
format!("set requires 2 arguments, got {}", args.len()),
));
}
std::env::set_var(&args[0], &args[1]);
Ok(RunResult::Builtin)
}
fn unset(args: &[String]) -> Result<RunResult, Error> {
if args.len() != 1 {
return Err(Error::new(
ErrorKind::InvalidInput,
format!("unset requires 1 argument, got {}", args.len()),
));
}
std::env::remove_var(&args[0]);
Ok(RunResult::Builtin)
}
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