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use std::io::{Error};
use std::path::{PathBuf};
use std::process::ExitStatus;
use std::process::Command as Process;
use super::builtins::{cd, set, unset};
// > overwrite
// >> append
// | pipe
#[derive(Debug)]
enum Redirect {
Std,
FileOverwrite(String),
FileAppend(String),
}
#[derive(Debug, PartialEq, Copy, Clone)]
pub(in crate::commandline) enum RunIf { Always, ExitSuccess, ExitFailure }
impl RunIf {
pub(in crate::commandline) fn can_run(&self, status: &Option<ExitStatus>) -> bool {
if *self == RunIf::Always {
return true;
}
match status {
Some(s) => {
(*self == RunIf::ExitSuccess && s.success())
|| (*self == RunIf::ExitFailure && !s.success())
}
None => true,
}
}
}
pub(in crate::commandline) enum RunResult {
Command(ExitStatus),
Builtin,
}
#[derive(Debug)]
pub struct Command {
args: Vec<String>,
stdout: Redirect,
pub(in crate::commandline) when: RunIf,
}
impl Command {
pub(in crate::commandline) fn new(line: &str, when: RunIf) -> Command {
let (args, stdout) = tokenize(line);
Command { args, stdout, when }
}
pub(in crate::commandline) 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 = Process::new(&self.args[0]).args(&self.args[1..]).spawn()?;
Ok(RunResult::Command(child.wait().unwrap()))
}
}
}
}
enum TokenType {
Argument,
StdoutFileOverwrite,
StdoutFileAppend,
}
fn tokenize(line: &str) -> (Vec<String>, Redirect) {
let mut args: Vec<String> = Vec::new();
let mut stdout = Redirect::Std;
let mut iter = line.chars().peekable();
let mut token = String::new();
let mut token_type = TokenType::Argument;
let mut quote = false;
while let Some(i) = iter.next() {
match i {
' ' => {
if quote {
token.push(' ');
}
}
'\'' => match iter.peek() {
Some(&'\'') | Some(&'>') | Some(&'&') => {
token.push(iter.next().unwrap());
}
_ => {
quote = !quote;
}
},
'>' => {
if iter.peek() == Some(&'>') {
token_type = TokenType::StdoutFileAppend;
iter.next();
} else {
token_type = TokenType::StdoutFileOverwrite;
}
}
_ => {
token.push(i);
}
}
if !token.is_empty() && ((iter.peek() == Some(&' ') && !quote) || iter.peek() == None) {
match token_type {
TokenType::Argument => args.push(token),
TokenType::StdoutFileOverwrite => stdout = Redirect::FileOverwrite(token),
TokenType::StdoutFileAppend => stdout = Redirect::FileAppend(token),
}
token = String::new();
}
}
(args, stdout)
}
/*
#[test]
fn test_tokenizer() {
{
let ls = tokenize("ls -l");
assert_eq!(ls.args, vec!("ls", "-l"));
let string = tokenize("ls -l 'something else'");
assert_eq!(string.args, vec!("ls", "-l", "something else"));
let escape = tokenize("ls -l 'junction jan''s'");
assert_eq!(escape.args, vec!("ls", "-l", "junction jan\'s"));
}
{
let o = tokenize("&& ls");
assert_eq!(o.args, vec!("ls"));
assert_eq!(o.when, RunOn::ExitSuccess);
let f = tokenize("|| ls");
assert_eq!(f.args, vec!("ls"));
assert_eq!(f.when, RunOn::ExitFailure);
}
println!("{:?}", tokenize("ls -l something'>"));
println!("{:?}", tokenize("ls -l something'>'>"));
println!("{:?}", tokenize("ls -l something >output"));
println!("{:?}", tokenize("ls -l something > output"));
println!("{:?}", tokenize("ls -l something >'junction jan''s'"));
println!("{:?}", tokenize("ls -l something >>output"));
println!("{:?}", tokenize("ls -l something >> output"));
println!("{:?}", tokenize("ls -l something >>'junction jan''s'"));
}
*/
|
