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use std::{io::Write, sync::atomic::Ordering};
use rustyline::{Config, EditMode, ColorMode, Editor, CompletionType, error::ReadlineError};
use matrix_lang::prelude::*;
use crate::{State, helper::MatrixHelper};
pub struct Repl<'s, 'a> {
state: &'s mut State<'a>
}
impl<'s, 'a> Repl<'s, 'a> {
pub fn new(state: &'s mut State<'a>) -> Self {
Self { state }
}
fn execute(&mut self, line: String) -> Result<Value> {
let fun = self.state.compile(line)?;
let val = self.state.execute(fun)?;
Ok(val)
}
pub fn run(&mut self) {
let interupt = self.state.vm.borrow().interupt();
ctrlc::set_handler(move || {
interupt.store(Interupt::KeyboardInterupt as usize, Ordering::SeqCst);
}).unwrap();
let config = Config::builder()
.indent_size(4)
.edit_mode(EditMode::Emacs)
.check_cursor_position(true)
.completion_type(CompletionType::List)
.color_mode(if self.state.color { ColorMode::Enabled } else { ColorMode::Disabled })
.build();
let helper = MatrixHelper::new(self.state.vm.clone());
let histfile = std::env::var("MATRIX_HISTORY").ok();
let mut rl = Editor::with_config(config).unwrap();
rl.set_helper(Some(helper));
if let Some(hf) = &histfile {
rl.load_history(hf).ok();
}
loop {
let line = match rl.readline(">> ") {
Ok(line) => line,
Err(ReadlineError::Eof) => break,
Err(_) => continue,
};
rl.add_history_entry(&line).ok();
match self.execute(line) {
Ok(val) => {
if val != Value::Nil {
if self.state.color {
println!("{val:#}");
} else {
println!("{val}");
}
}
}
Err(err) => crate::error(err, &self.state),
};
std::io::stdout().flush().ok();
}
if let Some(hf) = &histfile {
rl.save_history(hf).ok();
}
}
}
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