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system/src/Grav/Common/Composer.php

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+<?php
+
+/**
+ * @package    Grav\Common
+ *
+ * @copyright  Copyright (c) 2015 - 2021 Trilby Media, LLC. All rights reserved.
+ * @license    MIT License; see LICENSE file for details.
+ */
+
+namespace Grav\Common;
+
+use function function_exists;
+
+/**
+ * Class Composer
+ * @package Grav\Common
+ */
+class Composer
+{
+    /** @const Default composer location */
+    const DEFAULT_PATH = 'bin/composer.phar';
+
+    /**
+     * Returns the location of composer.
+     *
+     * @return string
+     */
+    public static function getComposerLocation()
+    {
+        if (!function_exists('shell_exec') || stripos(PHP_OS, 'win') === 0) {
+            return self::DEFAULT_PATH;
+        }
+
+        // check for global composer install
+        $path = trim((string)shell_exec('command -v composer'));
+
+        // fall back to grav bundled composer
+        if (!$path || !preg_match('/(composer|composer\.phar)$/', $path)) {
+            $path = self::DEFAULT_PATH;
+        }
+
+        return $path;
+    }
+
+    /**
+     * Return the composer executable file path
+     *
+     * @return string
+     */
+    public static function getComposerExecutor()
+    {
+        $executor = PHP_BINARY . ' ';
+        $composer = static::getComposerLocation();
+
+        if ($composer !== static::DEFAULT_PATH && is_executable($composer)) {
+            $file = fopen($composer, 'rb');
+            $firstLine = fgets($file);
+            fclose($file);
+
+            if (!preg_match('/^#!.+php/i', $firstLine)) {
+                $executor = '';
+            }
+        }
+
+        return $executor . $composer;
+    }
+}