"use strict";

const { spawn } = require("child_process");

module.exports = function pipe({ command, flags, stdin="", buffer } = {}) {
  return new Promise((resolve, reject) => {
    const child = spawn(command, flags);
    let stdout = (buffer?[]:"");
    let stderr = "";

    child.stderr.on("data", d => stderr += d);
    child.stdout.on("data", d => (buffer?
      stdout.push(d):stdout+=d));

    child.on("close", code => {
      const res = { code, stderr, stdout:
        (buffer?Buffer.concat(stdout):stdout) };

      if (code) reject(res);
      else resolve(res);
    });

    //child.stdin.setEncoding("utf-8");
    child.stdin.write(stdin);
    child.stdin.end();
  });
}