From e132a5a84ad8aac14479713dd7d4b36989180f2b Mon Sep 17 00:00:00 2001
From: Thomas Landauer <thomas@landauer.at>
Date: Tue, 10 Dec 2024 16:37:59 +0100
Subject: [PATCH 1/3] Adding explicit message to `why-not` if package is
 already installed

Closes #12227
---
 src/Composer/Command/BaseDependencyCommand.php | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Composer/Command/BaseDependencyCommand.php b/src/Composer/Command/BaseDependencyCommand.php
index 55b502e03..b17f3d93a 100644
--- a/src/Composer/Command/BaseDependencyCommand.php
+++ b/src/Composer/Command/BaseDependencyCommand.php
@@ -126,6 +126,8 @@ abstract class BaseDependencyCommand extends BaseCommand
                 $extraNotice = ' (version provided by config.platform)';
             }
             $this->getIO()->writeError('<info>Package "'.$needle.' '.$textConstraint.'" found in version "'.$matchedPackage->getPrettyVersion().'"'.$extraNotice.'.</info>');
+        } elseif ($inverted) {
+            $this->getIO()->write('<comment>Package "'.$needle.'" '.$matchedPackage->getPrettyVersion().' is already installed! To find out why, run `composer why '.$needle.'`</comment>');
         }
 
         // Include replaced packages for inverted lookups as they are then the actual starting point to consider

From cefdee50499b6306bfb327240b849dfe659862bb Mon Sep 17 00:00:00 2001
From: Thomas Landauer <thomas@landauer.at>
Date: Wed, 11 Dec 2024 13:31:36 +0100
Subject: [PATCH 2/3] Update BaseDependencyCommand.php

---
 src/Composer/Command/BaseDependencyCommand.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Composer/Command/BaseDependencyCommand.php b/src/Composer/Command/BaseDependencyCommand.php
index b17f3d93a..1f67f5bc3 100644
--- a/src/Composer/Command/BaseDependencyCommand.php
+++ b/src/Composer/Command/BaseDependencyCommand.php
@@ -128,6 +128,7 @@ abstract class BaseDependencyCommand extends BaseCommand
             $this->getIO()->writeError('<info>Package "'.$needle.' '.$textConstraint.'" found in version "'.$matchedPackage->getPrettyVersion().'"'.$extraNotice.'.</info>');
         } elseif ($inverted) {
             $this->getIO()->write('<comment>Package "'.$needle.'" '.$matchedPackage->getPrettyVersion().' is already installed! To find out why, run `composer why '.$needle.'`</comment>');
+            return 0;
         }
 
         // Include replaced packages for inverted lookups as they are then the actual starting point to consider

From 35ce4bd7692f2e3af5c777b90ceb8d336ab5afdb Mon Sep 17 00:00:00 2001
From: Thomas Landauer <thomas@landauer.at>
Date: Wed, 11 Dec 2024 13:46:24 +0100
Subject: [PATCH 3/3] Adjusting the test

---
 tests/Composer/Test/Command/BaseDependencyCommandTest.php | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/tests/Composer/Test/Command/BaseDependencyCommandTest.php b/tests/Composer/Test/Command/BaseDependencyCommandTest.php
index 0fad665ae..bc85d1899 100644
--- a/tests/Composer/Test/Command/BaseDependencyCommandTest.php
+++ b/tests/Composer/Test/Command/BaseDependencyCommandTest.php
@@ -464,11 +464,10 @@ OUTPUT
             0
         ];
 
-        yield 'there is no installed package depending on the package in versions not matching a specific version' => [
+        yield 'Package is already installed!' => [
             ['package' => 'vendor1/package1', 'version' => '^1.3'],
             <<<OUTPUT
-There is no installed package depending on "vendor1/package1" in versions not matching ^1.3
-Not finding what you were looking for? Try calling `composer require "vendor1/package1:^1.3" --dry-run` to get another view on the problem.
+Package "vendor1/package1" 1.3.0 is already installed! To find out why, run `composer why vendor1/package1`
 OUTPUT
 ,
             0