src/util/node-utils.js


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49

// Utility functions which are only relevant to particular Node.js constructs.

import {fileURLToPath} from 'url';

import _commandExists from 'command-exists';

// This package throws an error instead of returning false when the command
// doesn't exist, for some reason. Yay for making logic more difficult!
// Here's a straightforward workaround.
export function commandExists(command) {
  return _commandExists(command).then(
    () => true,
    () => false
  );
}

// Very cool function origin8ting in... http-music pro8a8ly!
// Sorry if we happen to 8e violating past-us's copyright, lmao.
export function promisifyProcess(proc, showLogging = true) {
  // Takes a process (from the child_process module) and returns a promise
  // that resolves when the process exits (or rejects, if the exit code is
  // non-zero).
  //
  // Ayy look, no alpha8etical second letter! Couldn't tell this was written
  // like three years ago 8efore I was me. 8888)

  return new Promise((resolve, reject) => {
    if (showLogging) {
      proc.stdout.pipe(process.stdout);
      proc.stderr.pipe(process.stderr);
    }

    proc.on('exit', (code) => {
      if (code === 0) {
        resolve();
      } else {
        reject(code);
      }
    });
  });
}

// Handy-dandy utility function for detecting whether the passed URL is the
// running JavaScript file. This takes `import.meta.url` from ES6 modules, which
// is great 'cuz (module === require.main) doesn't work without CommonJS
// modules.
export function isMain(importMetaURL) {
  return process.argv[1] === fileURLToPath(importMetaURL);
}