From b703aa67522bfcd91b653bdf9ad12574958e8d5b Mon Sep 17 00:00:00 2001
From: Chris Barnett <Chris.Barnett@rbi.co.uk>
Date: Wed, 12 Jan 2022 16:45:57 +0000
Subject: [PATCH 1/2] Added support for Composer 2

---
 composer.json                             |  2 +-
 src/Installer/MuPluginInstaller.php       | 33 ++++++++++++++++++++---
 src/Installer/MuPluginInstallerPlugin.php | 14 ++++++++--
 3 files changed, 42 insertions(+), 7 deletions(-)

diff --git a/composer.json b/composer.json
index 1bf8ec6..33e1152 100644
--- a/composer.json
+++ b/composer.json
@@ -31,7 +31,7 @@
     },
     "require"          : {
         "php"                : ">=5.3.2",
-        "composer-plugin-api": "~1.1.0"
+        "composer-plugin-api": "^1.0 || ^2.0"
     },
     "require-dev"      : {
         "composer/composer"        : "1.1.*@dev",
diff --git a/src/Installer/MuPluginInstaller.php b/src/Installer/MuPluginInstaller.php
index 5edb2fb..fbf252a 100644
--- a/src/Installer/MuPluginInstaller.php
+++ b/src/Installer/MuPluginInstaller.php
@@ -13,6 +13,7 @@
 use Composer\Installer\LibraryInstaller;
 use Composer\Package\PackageInterface;
 use Composer\Repository\InstalledRepositoryInterface;
+use React\Promise\PromiseInterface;
 
 /**
  * Class MuPluginInstaller
@@ -238,9 +239,21 @@ protected function resolveInstallPath(array $paths, $name)
      */
     protected function installCode(PackageInterface $package)
     {
-        parent::installCode($package);
+        $muPluginInstaller = $this;
 
-        $this->installLoader($package);
+        $installLoader = function () use ($muPluginInstaller, $package) {
+            $muPluginInstaller->installLoader($package);
+        };
+
+        $promise = parent::installCode($package);
+
+        // Composer v2 might return a promise here
+        if ($promise instanceof PromiseInterface) {
+            return $promise->then($installLoader);
+        }
+
+        // If not, execute the code right away as parent::uninstall executed synchronously (composer v1, or v2 without async)
+        $installLoader();
     }
 
     /**
@@ -261,9 +274,21 @@ protected function installLoader(PackageInterface $package)
      */
     protected function removeCode(PackageInterface $package)
     {
-        parent::removeCode($package);
+        $muPluginInstaller = $this;
+
+        $removeLoader = function () use ($muPluginInstaller, $package) {
+            $muPluginInstaller->removeLoader($package);
+        };
+
+        $promise = parent::removeCode($package);
+
+        // Composer v2 might return a promise here
+        if ($promise instanceof PromiseInterface) {
+            return $promise->then($removeLoader);
+        }
 
-        $this->removeLoader($package);
+        // If not, execute the code right away as parent::uninstall executed synchronously (composer v1, or v2 without async)
+        $removeLoader();
     }
 
     /**
diff --git a/src/Installer/MuPluginInstallerPlugin.php b/src/Installer/MuPluginInstallerPlugin.php
index 6c70299..3a6d788 100644
--- a/src/Installer/MuPluginInstallerPlugin.php
+++ b/src/Installer/MuPluginInstallerPlugin.php
@@ -21,13 +21,23 @@
  */
 class MuPluginInstallerPlugin implements PluginInterface
 {
+    private $installer;
+
     /**
      * {@inheritDoc}
      */
     public function activate(Composer $composer, IOInterface $io)
     {
-        $installer = new MuPluginInstaller($io, $composer);
+        $this->installer = new MuPluginInstaller($io, $composer);
+        $composer->getInstallationManager()->addInstaller($this->installer);
+    }
+
+    public function deactivate(Composer $composer, IOInterface $io)
+    {
+        $composer->getInstallationManager()->removeInstaller($this->installer);
+    }
 
-        $composer->getInstallationManager()->addInstaller($installer);
+    public function uninstall(Composer $composer, IOInterface $io)
+    {
     }
 }

From 9cc38da730e270a3342a47ae226a2020cff8312e Mon Sep 17 00:00:00 2001
From: Chris Barnett <Chris.Barnett@rbi.co.uk>
Date: Thu, 13 Jan 2022 09:10:16 +0000
Subject: [PATCH 2/2] Bumped version

---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index 335aaf2..3b25085 100644
--- a/package.json
+++ b/package.json
@@ -1,5 +1,5 @@
 {
-    "version"        : "0.2.0",
+    "version"        : "0.2.1",
     "repository"     : {
         "type": "git",
         "url" : "https://github.com/devaloka/mu-plugin-installer.git"