rofi-grub-reboot

#!/bin/env node

"use strict";
const util = require("util");
const exec = util.promisify(require("child_process").exec);

(async () => {
  /*
   * Explaination
   * Bash script:
   * sudo awk -F \- /^menuentry/{print\$1} /boot/grub/grub.cfg
   *
   * -F is field separator, we will separate the line (into columns)
   *  when the '-' is found
   *  ex (when printing 2nd column '{print $2}'):
   *  ```
   *  m42nk - gemink
   *  btw - i use arch
   *  ketawa - lol
   *  ```
   *
   *  will be:
   *  ```
   *  gemink
   *  i use arch
   *  lol
   *  ```
   *
   * /^menuentry means that find the line with 'menuentry'
   * as the start of the line (regex)
   *
   * when using regex, put the print command right after the
   * regex ending ('/')
   *
   * last argument is the name of the file
   *
   * Cut comand:
   * cut -d '"' -f2
   *
   * -d is the delimiter, we use the double-quote sign ('"')
   * -f2 means print the second column of that splitted line
   *  ex:
   *  ```
   *  my name is "pakde" just kidding
   *  ```
   *
   *  will be:
   *  ```
   *  my name is
   *  pakde
   *  just kidding
   *  ```
   *
   */

  // rofi Scripts
  const rofi_menu = 'rofi -dmenu -format i:s -p "Reboot to"';
  const rofi_confirm = (os_label) =>
    `rofi -dmenu -no-fixed-num-lines -p "Reboot to ${os_label}? (Y/n)" &`;
  const rofi_cancel = 'rofi -e "Operation cancelled."';
  const rofi_invalid = 'rofi -e "Invalid input, available options: Y/n"';

  // get all grub menuentry
  const { stdout: rawMenuEntry } = await exec(
    "sudo awk -F \\- /^menuentry/{print\\ \\$1} /boot/grub/grub.cfg | cut -d '\"' -f2"
  );

  // // split output by newline
  // const menuentry = rawMenuEntry.split("\n");

  // // remove trailing empty array element
  // menuentry.pop();

  // //join menuentry
  // const cleaned = menuentry.join("\n");

  const cleaned = rawMenuEntry.slice(0, -1);

  const choosen_os_raw = await exec(`echo "${cleaned}" | ${rofi_menu}`).catch(
    (err) => console.log("Exited: \n" + err)
  );

  // stop if error
  if (!choosen_os_raw) return;

  // remove trailing newline
  const chosen = choosen_os_raw.stdout.replace("\n", "");

  // destructure result from <bootnum>:<label>
  const [bootnum, label] = chosen.split(":");
  console.log("choosen " + chosen);

  const confirm_raw = await exec(rofi_confirm(label));

  // stop if error
  if (!confirm_raw) return;

  const confirm = confirm_raw.stdout;

  // available confirm answer
  const yes_ans = ["\n", "y\n", "yes\n"];
  const no_ans = ["n\n", "no\n"];

  if (yes_ans.includes(confirm.toLowerCase())) {
    console.log("yes");
    await exec(`sudo grub-reboot ${bootnum} && sudo reboot`);
  } else if (no_ans.includes(confirm.toLowerCase())) {
    console.log("no");
    await exec(rofi_cancel);
  } else {
    console.log("invalid input");
    await exec(rofi_invalid);
  }

  console.log({ confirm });
})();