From 0559e7143c1ca60661fa02577d358c069c9e9d0f Mon Sep 17 00:00:00 2001
From: Steve Boyd <emteknetnz@gmail.com>
Date: Tue, 2 Apr 2024 11:32:14 +1300
Subject: [PATCH] ENH Prevent merge-up from linkfield v3

---
 README.md              | 10 +++++++
 funcs.php              | 15 +++++++++++
 tests/BranchesTest.php | 61 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 86 insertions(+)

diff --git a/README.md b/README.md
index a3734fd..d341f60 100644
--- a/README.md
+++ b/README.md
@@ -12,3 +12,13 @@ steps:
 ```
 
 This action has no inputs
+
+## Preventing merge-ups from specific major versions of a repository
+
+update `DO_NOT_MERGE_UP_FROM_MAJOR` in `funcs.php`. For example to prevent merging up from the `3` major version of `silverstripe/silverstripe-linkfield`:
+
+```php
+const DO_NOT_MERGE_UP_FROM_MAJOR = [
+    'silverstripe/silverstripe-linkfield' => '3',
+];
+```
diff --git a/funcs.php b/funcs.php
index 428379b..5cc1d9d 100644
--- a/funcs.php
+++ b/funcs.php
@@ -3,6 +3,13 @@
 // This should always match default branch of silverstripe/framework
 const CURRENT_CMS_MAJOR = 5;
 
+// List of major branches to not merge up from
+// Add repos in here where the repo was previously unsupported
+// Note these are actual major branches, not CMS major versions
+const DO_NOT_MERGE_UP_FROM_MAJOR = [
+    'silverstripe/silverstripe-linkfield' => '3',
+];
+
 function branches(
     string $defaultBranch,
     string $minimumCmsMajor,
@@ -152,6 +159,14 @@ function branches(
         }
         $foundMinorInMajor[$major] = true;
     }
+    
+    // remove any branches less than or equal to DO_NOT_MERGE_UP_FROM_MAJOR
+    if (isset(DO_NOT_MERGE_UP_FROM_MAJOR[$githubRepository])) {
+        $doNotMergeUpFromMajor = DO_NOT_MERGE_UP_FROM_MAJOR[$githubRepository];
+        $branches = array_filter($branches, function($branch) use ($doNotMergeUpFromMajor) {
+            return version_compare($branch, $doNotMergeUpFromMajor, '>');
+        });
+    }
 
     // reverse the array so that oldest is first
     $branches = array_reverse($branches);
diff --git a/tests/BranchesTest.php b/tests/BranchesTest.php
index eb1a878..2559ab0 100644
--- a/tests/BranchesTest.php
+++ b/tests/BranchesTest.php
@@ -405,6 +405,67 @@ public function provideBranches()
                 ]
                 EOT,
             ],
+            'silverstripe-linkfield beta' => [
+                'expected' => ['4.0', '4', '5'],
+                'defaultBranch' => '4',
+                'minimumCmsMajor' => '4',
+                'githubRepository' => 'silverstripe/silverstripe-linkfield',
+                'composerJson' => <<<EOT
+                {
+                    "require": {
+                        "silverstripe/framework": "^5"
+                    }
+                }
+                EOT,
+                'branchesJson' => <<<EOT
+                [
+                    {"name": "1"},
+                    {"name": "2"},
+                    {"name": "3"},
+                    {"name": "4"},
+                    {"name": "4.0"},
+                    {"name": "5"}
+                ]
+                EOT,
+                'tagsJson' => <<<EOT
+                [
+                    {"name": "3.0.0-beta1"},
+                    {"name": "2.0.0"},
+                    {"name": "1.0.0"}
+                ]
+                EOT,
+            ],
+            'silverstripe-linkfield stable' => [
+                'expected' => ['4.0', '4', '5'],
+                'defaultBranch' => '4',
+                'minimumCmsMajor' => '4',
+                'githubRepository' => 'silverstripe/silverstripe-linkfield',
+                'composerJson' => <<<EOT
+                {
+                    "require": {
+                        "silverstripe/framework": "^5"
+                    }
+                }
+                EOT,
+                'branchesJson' => <<<EOT
+                [
+                    {"name": "1"},
+                    {"name": "2"},
+                    {"name": "3"},
+                    {"name": "4"},
+                    {"name": "4.0"},
+                    {"name": "5"}
+                ]
+                EOT,
+                'tagsJson' => <<<EOT
+                [
+                    {"name": "4.0.0"},
+                    {"name": "3.0.0"},
+                    {"name": "2.0.0"},
+                    {"name": "1.0.0"}
+                ]
+                EOT,
+            ],
         ];
     }
 }