[JENKINS-76185] Add GitLab merge request compatibility

README.md

@@ -129,15 +129,22 @@ pipeline {
 
 ### `PT_PULL_REQUEST` type
 
-The `PT_PULL_REQUEST` type lists pull requests in the remote repository.
+The `PT_PULL_REQUEST` type lists pull requests or merge requests in the remote repository.
+
+Supports:
+- GitHub Pull Requests
+- Bitbucket Pull Requests
+- GitLab Merge Requests
+
+#### GitHub Example
 
 ```groovy
 pipeline {
   agent any
   parameters {
     gitParameter type: 'PT_PULL_REQUEST',
                  name: 'A_PULL_REQUEST',
-                 defaultValue: '',
+                 defaultValue: '1818',
                  description: 'Choose a pull request to checkout',
                  selectedValue: 'TOP',
                  sortMode: 'DESCENDING_SMART'
@@ -146,14 +153,39 @@ pipeline {
     stage('Example') {
       steps {
         checkout scmGit(branches: [[name: "pr/${params.A_PULL_REQUEST}/head"]],
-                        userRemoteConfigs: [[refspec: '+refs/pull/*:refs/remotes/origin/pr/*',
+                        userRemoteConfigs: [[refspec: "+refs/pull/${params.A_PULL_REQUEST}/head:refs/pull/${params.A_PULL_REQUEST}/head",
                                              url: 'https://github.com/jenkinsci/git-plugin.git']])
       }
     }
   }
 }
 ```
 
+#### GitLab Example
+
+```groovy
+pipeline {
+  agent any
+  parameters {
+    gitParameter type: 'PT_PULL_REQUEST',
+                 name: 'MERGE_REQUEST',
+                 defaultValue: '',
+                 description: 'Choose a merge request to checkout',
+                 selectedValue: 'TOP',
+                 sortMode: 'DESCENDING_SMART'
+  }
+  stages {
+    stage('Example') {
+      steps {
+        checkout scmGit(branches: [[name: "refs/remotes/origin/merge-requests/${params.MERGE_REQUEST}/head"]],
+                        userRemoteConfigs: [[refspec: '+refs/merge-requests/*:refs/remotes/origin/merge-requests/*',
+                                             url: 'https://gitlab.com/your-group/your-project.git']])
+      }
+    }
+  }
+}
+```
+
 ### `PT_REVISION` type
 
 The `PT_REVISION` type lists all the revisions in the repository that are part of the `branch`.

src/main/java/net/uaznia/lukanus/hudson/plugins/gitparameter/Consts.java

@@ -13,7 +13,8 @@ public class Consts {
     public static final String PARAMETER_TYPE_TAG_BRANCH = "PT_BRANCH_TAG";
     public static final String PARAMETER_TYPE_PULL_REQUEST = "PT_PULL_REQUEST";
 
-    public static final Pattern PULL_REQUEST_REFS_PATTERN = Pattern.compile("refs/pull.*/(\\d+)/[from|head]");
+    public static final Pattern PULL_REQUEST_REFS_PATTERN =
+            Pattern.compile("refs/(pull.*|merge-requests)/(\\d+)/(from|head)");
 
     public static final String TEMPORARY_DIRECTORY_PREFIX = "git_parameter_";
     public static final String EMPTY_JOB_NAME = "EMPTY_JOB_NAME";

src/main/java/net/uaznia/lukanus/hudson/plugins/gitparameter/GitParameterDefinition.java

@@ -457,7 +457,7 @@ private Set<String> getPullRequest(GitClient gitClient, String gitUrl) throws Ex
         for (String remoteReference : remoteReferences.keySet()) {
             Matcher matcher = PULL_REQUEST_REFS_PATTERN.matcher(remoteReference);
             if (matcher.find()) {
-                pullRequestSet.add(matcher.group(1));
+                pullRequestSet.add(matcher.group(2));
             }
         }
         return pullRequestSet;

src/test/java/net/uaznia/lukanus/hudson/plugins/gitparameter/BasicSafeTests.java

@@ -51,14 +51,21 @@ void testCreateValue_StaplerRequest2() {
     void matchesWithBitbucketPullRequestRefs() {
         Matcher matcher = Consts.PULL_REQUEST_REFS_PATTERN.matcher("refs/pull-requests/186/from");
         assertTrue(matcher.find());
-        assertEquals("186", matcher.group(1));
+        assertEquals("186", matcher.group(2));
     }
 
     @Test
     void matchesWithGithubPullRequestRefs() {
         Matcher matcher = Consts.PULL_REQUEST_REFS_PATTERN.matcher("refs/pull/45/head");
         assertTrue(matcher.find());
-        assertEquals("45", matcher.group(1));
+        assertEquals("45", matcher.group(2));
+    }
+
+    @Test
+    void matchesWithGitLabMergeRequestRefs() {
+        Matcher matcher = Consts.PULL_REQUEST_REFS_PATTERN.matcher("refs/merge-requests/42/head");
+        assertTrue(matcher.find());
+        assertEquals("42", matcher.group(2));
     }
 
     @Test

src/test/java/net/uaznia/lukanus/hudson/plugins/gitparameter/BasicTests.java

@@ -61,14 +61,21 @@ void testCreateValue_StaplerRequest2() {
     void matchesWithBitbucketPullRequestRefs() {
         Matcher matcher = Consts.PULL_REQUEST_REFS_PATTERN.matcher("refs/pull-requests/186/from");
         assertTrue(matcher.find());
-        assertEquals("186", matcher.group(1));
+        assertEquals("186", matcher.group(2));
     }
 
     @Test
     void matchesWithGithubPullRequestRefs() {
         Matcher matcher = Consts.PULL_REQUEST_REFS_PATTERN.matcher("refs/pull/45/head");
         assertTrue(matcher.find());
-        assertEquals("45", matcher.group(1));
+        assertEquals("45", matcher.group(2));
+    }
+
+    @Test
+    void matchesWithGitLabMergeRequestRefs() {
+        Matcher matcher = Consts.PULL_REQUEST_REFS_PATTERN.matcher("refs/merge-requests/42/head");
+        assertTrue(matcher.find());
+        assertEquals("42", matcher.group(2));
     }
 
     @Test