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pub mod error;
use error::Error;
use std::io;
use std::io::prelude::*;
#[macro_use] extern crate lalrpop_util;
lalrpop_mod!(pub commandline);
pub type Result<T> = std::result::Result<T, Error>;
pub enum Input {
String(String),
End,
}
fn main() -> Result<()> {
std::process::exit(match repl() {
Ok(()) => 0,
Err(ref e) => {
eprintln!("{}", e);
1
}
})
}
fn repl() -> Result<()> {
println!("Hello, terminal!");
loop {
prompt()?;
let input = read()?;
match input {
Input::String(string) => execute(&string)?,
Input::End => break,
}
}
Ok(())
}
fn prompt() -> Result<()> {
print!("$ ");
io::stdout().flush()?;
Ok(())
}
fn read() -> Result<Input> {
let mut input = String::new();
let n_bytes = io::stdin().read_line(&mut input)?;
if n_bytes == 0 {
Ok(Input::End)
} else {
Ok(Input::String(input))
}
}
fn execute(input: &str) -> Result<()> {
let filename = commandline::FilenameParser::new().parse(input)?;
println!("{}", input);
println!("filename '{}'", filename);
Ok(())
}
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