Simple Calculator

I constantly need to make some simple calculations and that's one of a feature that I liked about Alfred.

With ScriptKit I think I made it slightly better:

• live preview of your calculation
• select to copy to clipboard
• remembers last 10 calculations
• auto fixing , to . - so you don't have to do it manually

Install calc

// Menu: Calculator
// Author: Jakub Olek
// Twitter: @JakubOlek
// Shortcut: opt =

const calcDb = await db("calc", { history: [] });

function createResult(calculationResult, input) {
  return {
    name: calculationResult,
    description: input,
    value: { calculationResult, input },
  };
}

const { calculationResult, input, ...rest } = await arg("0", async (input) => {
  const choices = [];

  if (input) {
    let { stdout } = exec(
      `bc <<<"${input.replace(/\,/g, ".")}" -l`,
      { silent: true } // Avoids printing the errors in the terminal
    );

    if (stdout) {
      choices.push(createResult(stdout.replace(/^\./, "0.").trim(), input));

      return choices.concat(calcDb.history);
    }
  }
});

if (calculationResult) {
  const history = calcDb.history;

  history.unshift(createResult(calculationResult, input));

  calcDb.history = history
    .filter(({ description }, index) => index === 0 || description !== input)
    .slice(0, 10);
  await calcDb.write();
}

copy(calculationResult);