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improved repl with a quit instruction

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This commit is contained in:
Ishan Jain 2024-06-08 09:04:46 +05:30
parent caee5ce154
commit c034099ff0
Signed by: ishan
GPG Key ID: 0506DB2A1CC75C27
4 changed files with 167 additions and 6 deletions
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120
Cargo.lock generated
View File

@ -2,15 +2,135 @@
# It is not intended for manual editing.
version = 3
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name = "bitflags"
version = "2.5.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
"nix",
"windows-sys",
]
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[[package]]
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"lazy_static",
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1
Cargo.toml
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@ -4,4 +4,5 @@ version = "0.1.0"
edition = "2021"
[dependencies]
ctrlc = "3.4.4"
lazy_static = "1.4.0"

26
src/main.rs
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@ -3,18 +3,34 @@ mod scanner;
mod loxi;
mod repl;
use std::env;
use std::{env, fs::File, io::Read, process};
use loxi::run;
fn main() {
let args: Vec<String> = env::args().collect();
match args.len() {
1 => repl::init(),
v if v > 1 => {
println!("Usage: loxi [script]")
2 => {
println!("{:?}", args);
run_file(&args[1]);
}
v if v > 2 => {
println!("Usage: loxi [script]");
process::exit(64);
}
_ => {
// TODO: Read the file
repl::init();
}
}
}
fn run_file(f: &str) {
let mut f = File::open(f).expect("error in opening file");
let mut contents = Vec::new();
f.read_to_end(&mut contents).expect("error in reading file");
let contents = String::from_utf8(contents).expect("file is not encoded in utf8");
run(&contents)
}

26
src/repl.rs
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@ -1,5 +1,9 @@
use crate::loxi::run;
use std::io::{self, BufRead, Write};
use std::{
io::{self, BufRead, Write},
sync::mpsc,
time::Duration,
};
const PROMPT: &[u8] = b">> ";
@ -13,9 +17,29 @@ pub fn init() {
}
fn start<R: BufRead, W: Write>(mut ip: R, mut out: W) {
let (send, recv) = mpsc::channel();
let mut should_quit = false;
ctrlc::set_handler(move || {
send.send(()).expect("error in sending signal to channel");
})
.expect("error in setting Ctrl+C handler");
loop {
out.write_all(PROMPT).unwrap();
out.flush().unwrap();
if recv.recv_timeout(Duration::from_millis(5)).is_ok() {
if should_quit {
std::process::exit(0);
}
should_quit = true;
out.write_all(b"\r \r")
.unwrap();
continue;
} else {
should_quit = false;
}
let mut s = String::new();
ip.read_line(&mut s).unwrap();