Add Pico::getVendorDir()

The vendor directory is the installation path of the `picocms/Pico` package. If `picocms/Pico` is the composer root package (as in pre-bundled releases), it should be identical to `Pico::getRootDir()`. However, if `picocms/Pico` was installed as composer dependency (e.g. by `picocms/pico-composer`), the vendor directory usually corresponds to something like `Pico::getRootDir() . "vendor/picocms/pico"`. The vendor directory is currently only used as a last resort to load Pico's sample contents.

lib/Pico.php

@@ -74,6 +74,14 @@ class Pico
      */
     protected $rootDir;
 
+    /**
+     * Vendor directory of this Pico instance
+     *
+     * @see Pico::getVendorDir()
+     * @var string
+     */
+    protected $vendorDir;
+
     /**
      * Config directory of this Pico instance
      *
@@ -262,6 +270,7 @@ class Pico
     public function __construct($rootDir, $configDir, $pluginsDir, $themesDir)
     {
         $this->rootDir = rtrim($rootDir, '/\\') . '/';
+        $this->vendorDir = dirname(__DIR__) . '/';
         $this->configDir = $this->getAbsolutePath($configDir);
         $this->pluginsDir = $this->getAbsolutePath($pluginsDir);
         $this->themesDir = $this->getAbsolutePath($themesDir);
@@ -277,6 +286,16 @@ class Pico
         return $this->rootDir;
     }
 
+    /**
+     * Returns the vendor directory of this Pico instance
+     *
+     * @return string vendor directory path
+     */
+    public function getVendorDir()
+    {
+        return $this->vendorDir;
+    }
+
     /**
      * Returns the config directory of this Pico instance
      *
@@ -744,8 +763,10 @@ class Pico
             // try to guess the content directory
             if (is_dir($this->getRootDir() . 'content')) {
                 $this->config['content_dir'] = $this->getRootDir() . 'content/';
-            } else {
+            } elseif (is_dir($this->getRootDir() . 'content-sample')) {
                 $this->config['content_dir'] = $this->getRootDir() . 'content-sample/';
+            } else {
+                $this->config['content_dir'] = $this->getVendorDir() . 'content-sample/';
             }
         } else {
             $this->config['content_dir'] = $this->getAbsolutePath($this->config['content_dir']);