now-cli/bin/now.js

#!/usr/bin/env node

// Native
const { resolve } = require("path");

// Packages
const nodeVersion = require("node-version");
const updateNotifier = require("update-notifier");
const chalk = require("chalk");

// Ours
const { error } = require("../lib/error");
const pkg = require("../lib/pkg");

// Throw an error if node version is too low
if (nodeVersion.major < 6) {
  error("Now requires at least version 6 of Node. Please upgrade!");
  process.exit(1);
}

if (!process.pkg) {
  const notifier = updateNotifier({ pkg });
  const update = notifier.update;

  if (update) {
    let message = `Update available! ${chalk.red(update.current)} → ${chalk.green(update.latest)} \n`;
    message += `Run ${chalk.magenta("npm i -g now")} to update!\n`;
    message += `${chalk.magenta("Changelog:")} https://github.com/zeit/now-cli/releases/tag/${update.latest}`;

    notifier.notify({ message });
  }
}

// This command will be run if no other sub command is specified
const defaultCommand = "deploy";

const commands = new Set([
  defaultCommand,
  "help",
  "list",
  "ls",
  "rm",
  "remove",
  "alias",
  "aliases",
  "ln",
  "domain",
  "domains",
  "dns",
  "cert",
  "certs",
  "secret",
  "secrets",
  "cc",
  "billing",
  "upgrade",
  "downgrade",
  "open"
]);

const aliases = new Map([
  ["ls", "list"],
  ["rm", "remove"],
  ["ln", "alias"],
  ["aliases", "alias"],
  ["domain", "domains"],
  ["cert", "certs"],
  ["secret", "secrets"],
  ["cc", "billing"],
  ["downgrade", "upgrade"]
]);

let cmd = defaultCommand;
const args = process.argv.slice(2);
const index = args.findIndex(a => commands.has(a));

if (index > -1) {
  cmd = args[index];
  args.splice(index, 1);

  if (cmd === "help") {
    if (index < args.length && commands.has(args[index])) {
      cmd = args[index];
      args.splice(index, 1);
    } else {
      cmd = defaultCommand;
    }

    args.unshift("--help");
  }

  cmd = aliases.get(cmd) || cmd;
}

const bin = resolve(__dirname, "now-" + cmd + ".js");

// Prepare process.argv for subcommand
process.argv = process.argv.slice(0, 2).concat(args);

// Load sub command
// With custom parameter to make "pkg" happy
require(bin, "may-exclude");