cli.ts

import { minify, Language } from "./mod.ts";
import {
  green,
  bold,
  red,
  blue,
  gray,
} from "https://deno.land/std@0.84.0/fmt/colors.ts";

const { args } = Deno;

switch (args[0]) {
  case "--help":
  case "-H":
    console.log(
      `  <file-location>  minifies the given file from the file location
  <file-location> <output-location>  minifies the given file from the file location and saves it as the output file
  -H, --help  provides info on all of the commands available
  -V, --version  gives the version info for the CLI`
    );
    Deno.exit(1);
    break;
  case undefined:
  case "--version":
  case "-V":
    console.log("minifier v1.1.0");
    Deno.exit(1);
    break;
}

const [fileName, ...rest] = args;

function msg(emoji: string, message: string) {
  return `${emoji} ${message}`;
}

if (rest.length > 1) {
  console.error(msg("❌", "Too many arguments passed in."));
  Deno.exit();
}

const fileContents = await Deno.readTextFile(fileName).catch((err) => {
  console.error(msg("❌", `Cannot find ${bold(red(fileName))}.`));
  Deno.exit();
});
const fileNameParts = fileName.split(".");
const fileNameEnding = fileNameParts[fileNameParts.length - 1].toLowerCase();

const targetFile = rest[0] ?? fileName;

await Deno.writeTextFile(
  targetFile,
  minify(fileNameEnding.toLowerCase() as Language, fileContents)
);

console.log(
  msg(
    "✅",
    `Successfully minified ${bold(green(fileName))}${
      targetFile === fileName ? "" : ` as ${bold(blue(targetFile))}`
    }! ${gray(`(${performance.now().toFixed(0)}ms)`)}`
  )
);