#!/usr/bin/env node

// Compile a Vega-Lite spec to Vega

const {createWriteStream} = require('fs');
const vegaLite = require('..');
const read = require('./read');
const args = require('./args');

const arg = args('vega');

// load spec, compile vg spec
read(arg._[0]).then(text => compile(JSON.parse(text)));

async function compile(vlSpec) {
  // @ts-ignore
  const vgSpec = vegaLite.compile(vlSpec).spec;

  const file = arg._[1] || null;
  const out = file ? createWriteStream(file) : process.stdout;
  if (arg.p) {
    const compactStringify = (await import('json-stringify-pretty-compact')).default;
    out.write(compactStringify(vgSpec) + '\n');
  } else {
    out.write(JSON.stringify(vgSpec) + '\n');
  }
}