PHP script to make "(composer|npm) outdated" smarter

outdated-deps.php

#!/usr/bin/php
<?php

// We will filter original outputs by ignoring packages for which we aren't using the latest major version,
// as well as branch references and packages installed straight from git repos.
$isUpToDateComposer = true;
$isUpToDateNpm = true;

// Composer
if (file_exists('composer.json')) {
    shell_exec('composer install -q'); // we must install dependencies first

    $packages = array_filter(
        explode(PHP_EOL, shell_exec('composer outdated --direct --no-ansi')),
        function($package) {
            // Get rid of empty elements
            if (empty($package)) {
                return false;
            }

            preg_match_all('/\s+v?([0-9]+\.[0-9]+\.[0-9]+)/', $package, $versions);
            $versions = $versions[1]; // preg_match_all is a creep

            // Get rid of branch references
            if (empty($versions)) {
                return false;
            }

            // Only keep what we need and explode version numbers as arrays for easier comparison
            list($current, $wanted) = array_map(
                function($item) {
                    return explode('.', $item);
                },
                $versions
            );

            // Ignore not-backwards-compatible suggested upgrades, like a major version bump
            // or a minor version bump under 0th major
            return (($current[0] === $wanted[0]) && (($current[0] !== '0') || ($current[1] === $wanted[1])));
        }
    );

    echo(implode(PHP_EOL, $packages).PHP_EOL);
    $isUpToDateComposer = count($packages) === 0;
}

// NPM
if (file_exists('package.json')) {
    shell_exec('npm install --quiet'); // we must install dependencies first

    $packages = array_filter(
        explode(PHP_EOL, shell_exec('npm outdated --parseable')),
        function($package) {
            // Get rid of empty elements, and git-based dependencies
            if (empty($package) || strpos($package, '@git') !== false) {
                return false;
            }

            preg_match_all('/@([0-9]+\.[0-9]+\.[0-9]+)/', $package, $versions);
            $versions = $versions[1]; // preg_match_all is a weirdo

            // First version is the currently installed one, second is the latest according to our constraint,
            // and third is the latest overall.
            // We therefore must compare first and second to determine whether we are out-of-date.
            return $versions[0] !== $versions[1];
        }
    );

    echo(implode(PHP_EOL, $packages).PHP_EOL);
    $isUpToDateNpm = count($packages) === 0;
}

// The boolean value will be casted to an integer automatically.
// Our status code will thus be 0 if everything is up-to-date, 1 otherwise.
exit(!($isUpToDateComposer && $isUpToDateNpm));