Introduce a vendor path

This lets us or anyone modify the path from where dependencies (usually
installed into /vendor by Composer) are loaded. We need to be able to
tweak this in our integration tests, where the application code under
test needs access to certain dependencies.

src/Foundation/Application.php

@@ -41,6 +41,20 @@ class Application extends Container implements ApplicationContract
      */
     protected $publicPath;
 
+    /**
+     * The custom storage path defined by the developer.
+     *
+     * @var string
+     */
+    protected $storagePath;
+
+    /**
+     * A custom vendor path to find dependencies in non-standard environments.
+     *
+     * @var string
+     */
+    protected $vendorPath;
+
     /**
      * Indicates if the application has "booted".
      *
@@ -83,13 +97,6 @@ class Application extends Container implements ApplicationContract
      */
     protected $deferredServices = [];
 
-    /**
-     * The custom storage path defined by the developer.
-     *
-     * @var string
-     */
-    protected $storagePath;
-
     /**
      * Create a new Flarum application instance.
      *
@@ -226,7 +233,7 @@ class Application extends Container implements ApplicationContract
      */
     protected function bindPathsInContainer()
     {
-        foreach (['base', 'public', 'storage'] as $path) {
+        foreach (['base', 'public', 'storage', 'vendor'] as $path) {
             $this->instance('path.'.$path, $this->{$path.'Path'}());
         }
     }
@@ -261,6 +268,16 @@ class Application extends Container implements ApplicationContract
         return $this->storagePath ?: $this->basePath.DIRECTORY_SEPARATOR.'storage';
     }
 
+    /**
+     * Get the path to the vendor directory where dependencies are installed.
+     *
+     * @return string
+     */
+    public function vendorPath()
+    {
+        return $this->vendorPath ?: $this->basePath.DIRECTORY_SEPARATOR.'vendor';
+    }
+
     /**
      * Set the storage directory.
      *
@@ -276,6 +293,21 @@ class Application extends Container implements ApplicationContract
         return $this;
     }
 
+    /**
+     * Set the vendor directory.
+     *
+     * @param string $path
+     * @return $this
+     */
+    public function useVendorPath($path)
+    {
+        $this->vendorPath = $path;
+
+        $this->instance('path.vendor', $path);
+
+        return $this;
+    }
+
     /**
      * Get or check the current application environment.
      *

src/Foundation/InstalledSite.php

@@ -100,6 +100,10 @@ class InstalledSite implements SiteInterface
 
         $laravel->useStoragePath($this->paths['storage']);
 
+        if (isset($this->paths['vendor'])) {
+            $laravel->useVendorPath($this->paths['vendor']);
+        }
+
         $laravel->instance('env', 'production');
         $laravel->instance('flarum.config', $this->config);
         $laravel->instance('config', $config = $this->getIlluminateConfig($laravel));

src/Foundation/UninstalledSite.php

@@ -59,6 +59,10 @@ class UninstalledSite implements SiteInterface
 
         $laravel->useStoragePath($this->paths['storage']);
 
+        if (isset($this->paths['vendor'])) {
+            $laravel->useVendorPath($this->paths['vendor']);
+        }
+
         $laravel->instance('env', 'production');
         $laravel->instance('flarum.config', []);
         $laravel->instance('config', $config = $this->getIlluminateConfig());