From cc42d01c7aacf179da09108749bbbe00502cca19 Mon Sep 17 00:00:00 2001
From: Philipp Daun <post@philippdaun.net>
Date: Mon, 22 Jun 2026 11:28:09 +0300
Subject: [PATCH 1/4] Add package param to installed tag

---
 src/Tags/Installed.php       | 15 +++++++++++++++
 tests/Tags/InstalledTest.php |  7 +++++++
 2 files changed, 22 insertions(+)

diff --git a/src/Tags/Installed.php b/src/Tags/Installed.php
index 242898c1b3f..dfeb6382d4e 100644
--- a/src/Tags/Installed.php
+++ b/src/Tags/Installed.php
@@ -6,6 +6,16 @@
 
 class Installed extends Tags
 {
+    /**
+     * Check if composer package is installed via {{ installed package="*" }}.
+     *
+     * @return string|void
+     */
+    public function index()
+    {
+        return $this->installed($this->params->get('package'));
+    }
+
     /**
      * Check if composer package is installed via {{ installed:* }}.
      *
@@ -13,6 +23,11 @@ class Installed extends Tags
      * @return string|void
      */
     public function wildcard($package)
+    {
+        return $this->installed($package);
+    }
+
+    protected function installed($package)
     {
         $installed = Composer::isInstalled($package);
 
diff --git a/tests/Tags/InstalledTest.php b/tests/Tags/InstalledTest.php
index 481d653cda9..bd5a9e1162a 100644
--- a/tests/Tags/InstalledTest.php
+++ b/tests/Tags/InstalledTest.php
@@ -34,4 +34,11 @@ 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 }}'));
+    }
 }

From 094c8dbd5ea84a4b11c7c8e8c014eeca38c9a8f9 Mon Sep 17 00:00:00 2001
From: Philipp Daun <post@philippdaun.net>
Date: Mon, 22 Jun 2026 18:59:59 +0300
Subject: [PATCH 2/4] Guard against empty package param

---
 src/Tags/Installed.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/Tags/Installed.php b/src/Tags/Installed.php
index dfeb6382d4e..2a8b85a41cd 100644
--- a/src/Tags/Installed.php
+++ b/src/Tags/Installed.php
@@ -13,7 +13,11 @@ class Installed extends Tags
      */
     public function index()
     {
-        return $this->installed($this->params->get('package'));
+        if (! $package = $this->params->get('package')) {
+            return;
+        }
+
+        return $this->installed($package);
     }
 
     /**

From 2ef3a6a96f8e8649ce78bce3ddbce2cf936b03a7 Mon Sep 17 00:00:00 2001
From: Jason Varga <jason@pixelfear.com>
Date: Tue, 23 Jun 2026 10:42:45 -0400
Subject: [PATCH 3/4] test

---
 tests/Tags/InstalledTest.php | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tests/Tags/InstalledTest.php b/tests/Tags/InstalledTest.php
index bd5a9e1162a..a7694810c40 100644
--- a/tests/Tags/InstalledTest.php
+++ b/tests/Tags/InstalledTest.php
@@ -41,4 +41,11 @@ 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 }}'));
+    }
 }

From 34951b7db6807a43f01158441ec66361b80c986d Mon Sep 17 00:00:00 2001
From: Jason Varga <jason@pixelfear.com>
Date: Tue, 23 Jun 2026 10:43:18 -0400
Subject: [PATCH 4/4] nit

---
 src/Tags/Installed.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Tags/Installed.php b/src/Tags/Installed.php
index 2a8b85a41cd..8c403214a4d 100644
--- a/src/Tags/Installed.php
+++ b/src/Tags/Installed.php
@@ -7,7 +7,7 @@
 class Installed extends Tags
 {
     /**
-     * Check if composer package is installed via {{ installed package="*" }}.
+     * Check if composer package is installed via {{ installed package="vendor/package" }}.
      *
      * @return string|void
      */