[6.x] Add explicit package param to installed tag (#14858)

Co-authored-by: Jason Varga <jason@pixelfear.com>

Author: daun

src/Tags/Installed.php

@@ -6,13 +6,32 @@
 
 class Installed extends Tags
 {
+    /**
+     * Check if composer package is installed via {{ installed package="vendor/package" }}.
+     *
+     * @return string|void
+     */
+    public function index()
+    {
+        if (! $package = $this->params->get('package')) {
+            return;
+        }
+
+        return $this->installed($package);
+    }
+
     /**
      * Check if composer package is installed via {{ installed:* }}.
      *
      * @param  string  $package
      * @return string|void
      */
     public function wildcard($package)
+    {
+        return $this->installed($package);
+    }
+
+    protected function installed($package)
     {
         $installed = Composer::isInstalled($package);
 

tests/Tags/InstalledTest.php

@@ -34,4 +34,18 @@ public function it_can_check_if_package_is_installed_using_tag_pair()
         $this->assertEquals('yes', $this->tag('{{ installed:hasselhoff/baywatch-embeds }}yes{{ /installed:hasselhoff/baywatch-embeds }}'));
         $this->assertEquals('', $this->tag('{{ installed:hasselhoff/lotr-embeds }}yes{{ /installed:hasselhoff/lotr-embeds }}'));
     }
+
+    #[Test]
+    public function it_can_check_if_package_is_installed_using_param()
+    {
+        $this->assertEquals('yes', $this->tag('{{ installed package="hasselhoff/baywatch-embeds" }}yes{{ /installed }}'));
+        $this->assertEquals('', $this->tag('{{ installed package="hasselhoff/lotr-embeds" }}yes{{ /installed }}'));
+    }
+
+    #[Test]
+    public function it_outputs_empty_when_passing_nothing()
+    {
+        $this->assertEquals('', $this->tag('{{ installed package="" }}yes{{ /installed }}'));
+        $this->assertEquals('', $this->tag('{{ installed :package="null" }}yes{{ /installed }}'));
+    }
 }