WordPress + Composer integration prototype

wp-composer.php

<?php
/**
 * Plugin Name: WP Composer
 * Require: something @ >=4.0, another @ latest
 */

add_action('extra_plugin_headers', function ($headers) {
    $headers['Require'] = 'Require';
    return $headers;
});

function parse_require($string) {
    $libs = array_filter(preg_split('/\s*,\s*/', $string));
    $libs = array_map(function ($lib) {
        return preg_split('/\s*@\s*/', $lib);
    }, $libs);
    return $libs;
}

add_action('load-plugins.php', function () {
    $plugins = get_plugins();

    foreach ($plugins as $p => $data) {
        if (empty($data['Require'])) continue;

        echo "<p><strong>Composer requirements for: " . $data['Name'] . "</strong></p>";
        echo "<pre>" . print_r(parse_require($data["Require"]), true) . "</pre>";
        echo "<br><br><hr><br><br>";
    }
});

/**
 * TODO:
 *     - On plugin activate/deactivate, modify composer.json file, autorun 'composer install'
 *     - WP-CLI command? $ wp composer install (pull plugin data first)
 *     - auto include vendor/autoload file? Not possible?
 */