// This example contains information adapted from the MSPGCC project's documentation.
// As such, it is licensed under the GPL, to the extent that such a thing is possible.
// https://mspgcc.sourceforge.net/manual/ln16.html
#![feature(decl_macro)]

use anes::{Color, ResetAttributes, SetForegroundColor};
use msp430_asm::parser::preamble::*;
use msp430_asm::preamble::*;
use std::{
    error::Error,
    io::{stdin, IsTerminal, Write},
};

type AsmResult<T> = Result<T, Box<dyn Error>>;

mod data;

fn main() -> AsmResult<()> {
    if stdin().is_terminal() {
        hello();
    }
    repl()
}

fn hello() {
    println!(
        "{}{} v{}
This software contains instruction and register descriptions adapted from
the mspgcc project's fantastic documentation, which is licensed under the GPL.
https://mspgcc.sourceforge.net/manual/book1.html{}\n",
        SetForegroundColor(Color::DarkGray),
        env!("CARGO_BIN_NAME"),
        env!("CARGO_PKG_VERSION"),
        ResetAttributes
    );
}

fn repl() -> AsmResult<()> {
    printflush!("> ");
    let mut line = String::new();
    while let Ok(len) = stdin().read_line(&mut line) {
        match len {
            0 => break, // No newline (reached EOF)
            1 => (),    // Line is empty
            _ => {
                if line.starts_with('?') || line.starts_with("help") {
                    data::list_opcodes()
                } else if let Ok(sf) = data::SyntaxFragment::try_from(line.as_str()) {
                    sf.info();
                }
            }
        }
        printflush!("> ");
        line.clear();
    }
    Ok(())
}

macro printflush ($($x: expr),+) {
    {print!($($x),+); let _ = ::std::io::stdout().flush();}
}