src/util/node-utils.js


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// 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));
}