composer/bin/installer

#!/usr/bin/env php
<?php

/*
 * This file is part of Composer.
 *
 * (c) Nils Adermann <naderman@naderman.de>
 *     Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */


process($argv);

/**
 * processes the installer
 */
function process($argv)
{
    $check = in_array('--check', $argv);
    $help = in_array('--help', $argv);
    $force = in_array('--force', $argv);

    if ($help) {
        displayHelp();
        exit(0);
    }

    $ok = checkPlatform();

    if ($check && !$ok) {
        exit(1);
    }

    if ($ok || $force) {
        installComposer();
    }

    exit(0);
}

/**
 * displays the help
 */
function displayHelp()
{
    echo <<<EOF
Composer Installer
------------------
Options
--help   this help
--check  for checking environment only
--force  forces the installation

EOF;
}

/**
 * check the platform for possible issues on running composer
 */
function checkPlatform()
{
    $errors = array();
    if (false !== ini_get('detect_unicode')) {
        $errors['unicode'] = 'On';
    }

    if (ini_get('phar.readonly')) {
        $errors['readonly'] = 'On';
    }

    if (ini_get('phar.require_hash')) {
        $errors['require_hash'] = 'On';
    }

    if ($suhosin = ini_get('suhosin.executor.include.whitelist') && (isset($suhosin) && false === stripos($suhosin, 'phar'))) {
        $errors['suhosin'] = $suhosin;
    }

    if (PHP_VERSION < '5.3.2') {
        $errors['php'] = PHP_VERSION;
    }

    if (!empty($errors)) {
        out("Composer detected that you have enabled some settings in your `php.ini` file that can make Composer unable to work properly.".PHP_EOL, 'error');

        echo PHP_EOL.'Make sure that you have changed options listed below:'.PHP_EOL;
        foreach ($errors as $error => $actual) {
            switch ($error) {
                case 'unicode':
                    $text = "    detect_unicode = Off (actual: {$actual})".PHP_EOL;
                    break;

                case 'readonly':
                    $text = "    phar.readonly = Off (actual: {$actual})".PHP_EOL;
                    break;

                case 'require_hash':
                    $text = "    phar.require_hash = Off (actual: {$actual})".PHP_EOL;
                    break;

                case 'suhosin':
                    $text = "    suhosin.executor.include.whitelist = phar (actual: {$actual})".PHP_EOL;
                    break;
                case 'php':
                    $text = "    PHP_VERSION (actual: {$actual})".PHP_EOL;
                    break;
            }
            out($text, 'info');
        }
        echo PHP_EOL;
        return false;
    }

    out("All settings correct for using Composer".PHP_EOL,'success');
    return true;
}

/**
 * installs composer to the current working directory
 */
function installComposer()
{
    $installDir = getcwd();
    $file = $installDir . DIRECTORY_SEPARATOR . 'composer.phar';

    if (is_readable($file)) {
        @unlink($file);
    }

    $download = copy('http://getcomposer.org/composer.phar', $installDir.DIRECTORY_SEPARATOR.'composer.phar');

    out(PHP_EOL."Composer successfully installed to: " . $file, 'success');
    out(PHP_EOL."Use it: php composer.phar".PHP_EOL, 'info');
}

/**
 * colorize output
 */
function out($text, $color = null)
{
    $styles = array(
        'success' => "\033[0;32m%s\033[0m",
        'error' => "\033[31;31m%s\033[0m",
        'info' => "\033[33;33m%s\033[0m"
    );

    echo sprintf(isset($styles[$color]) ? $styles[$color] : "%s", $text);
}