shell.js

#!/usr/bin/env node

import osklang from "./osklang_simple.js";
import prompt_sync from "prompt-sync";
import { readFileSync } from 'fs';
import ascii from 'ascii-art';

const prompt = prompt_sync();


const { font } = ascii;

(async () => {
  const rendered = await font("Osklang", 'doom').completed();
  console.log(rendered);

  const [,,fileName] = process.argv;
  
  if (fileName) {
    // execute file
    let code;
    try {
      code = readFileSync(fileName, 'utf8');
    } catch(e) {
      console.log('Invalid input file');
      process.exit(1);
    }
  
    const { error } = osklang.evaluate(fileName, code);
    if (error) console.log(error);
  } else {
    // open repl
    while (true) {
      const input = prompt("> ");
      if (input === null) break;
    
      const { output, error } = osklang.evaluate('<stdin>', input, 0);
      
      if (error) {
        console.log(error);
        continue;
      }
      
      console.log(output);
    }
  }
  
})();