feat(api): add MR pipeline manager in favor of pipelines() method

3 files changed, 45 insertions, 20 deletions

diff --git a/gitlab/cli.py b/gitlab/cli.py
index a5044ff..c053a38 100644
--- a/gitlab/cli.py
+++ b/gitlab/cli.py
@@ -53,6 +53,7 @@ def register_custom_action(
     cls_names: Union[str, Tuple[str, ...]],
     mandatory: Tuple[str, ...] = tuple(),
     optional: Tuple[str, ...] = tuple(),
+    custom_action: Optional[str] = None,
 ) -> Callable[[__F], __F]:
     def wrap(f: __F) -> __F:
         @functools.wraps(f)
@@ -74,7 +75,7 @@ def register_custom_action(
             if final_name not in custom_actions:
                 custom_actions[final_name] = {}
 
-            action = f.__name__.replace("_", "-")
+            action = custom_action or f.__name__.replace("_", "-")
             custom_actions[final_name][action] = (mandatory, optional, in_obj)
 
         return cast(__F, wrapped_f)
diff --git a/gitlab/v4/objects/merge_requests.py b/gitlab/v4/objects/merge_requests.py
index dd118d0..e8c2a96 100644
--- a/gitlab/v4/objects/merge_requests.py
+++ b/gitlab/v4/objects/merge_requests.py
@@ -28,6 +28,7 @@ from .merge_request_approvals import (  # noqa: F401
     ProjectMergeRequestApprovalRuleManager,
 )
 from .notes import ProjectMergeRequestNoteManager  # noqa: F401
+from .pipelines import ProjectMergeRequestPipelineManager  # noqa: F401
 
 __all__ = [
     "MergeRequest",
@@ -145,6 +146,7 @@ class ProjectMergeRequest(
         ("diffs", "ProjectMergeRequestDiffManager"),
         ("discussions", "ProjectMergeRequestDiscussionManager"),
         ("notes", "ProjectMergeRequestNoteManager"),
+        ("pipelines", "ProjectMergeRequestPipelineManager"),
         ("resourcelabelevents", "ProjectMergeRequestResourceLabelEventManager"),
         ("resourcemilestoneevents", "ProjectMergeRequestResourceMilestoneEventManager"),
         ("resourcestateevents", "ProjectMergeRequestResourceStateEventManager"),
@@ -240,25 +242,6 @@ class ProjectMergeRequest(
         path = "%s/%s/changes" % (self.manager.path, self.get_id())
         return self.manager.gitlab.http_get(path, **kwargs)
 
-    @cli.register_custom_action("ProjectMergeRequest")
-    @exc.on_http_error(exc.GitlabListError)
-    def pipelines(self, **kwargs):
-        """List the merge request pipelines.
-
-        Args:
-            **kwargs: Extra options to send to the server (e.g. sudo)
-
-        Raises:
-            GitlabAuthenticationError: If authentication is not correct
-            GitlabListError: If the list could not be retrieved
-
-        Returns:
-            RESTObjectList: List of changes
-        """
-
-        path = "%s/%s/pipelines" % (self.manager.path, self.get_id())
-        return self.manager.gitlab.http_get(path, **kwargs)
-
     @cli.register_custom_action("ProjectMergeRequest", tuple(), ("sha",))
     @exc.on_http_error(exc.GitlabMRApprovalError)
     def approve(self, sha=None, **kwargs):
diff --git a/gitlab/v4/objects/pipelines.py b/gitlab/v4/objects/pipelines.py
index 79b0802..5118e78 100644
--- a/gitlab/v4/objects/pipelines.py
+++ b/gitlab/v4/objects/pipelines.py
@@ -1,3 +1,5 @@
+import warnings
+
 from gitlab import cli
 from gitlab import exceptions as exc
 from gitlab.base import RequiredOptional, RESTManager, RESTObject
@@ -15,6 +17,8 @@ from gitlab.mixins import (
 )
 
 __all__ = [
+    "ProjectMergeRequestPipeline",
+    "ProjectMergeRequestPipelineManager",
     "ProjectPipeline",
     "ProjectPipelineManager",
     "ProjectPipelineJob",
@@ -32,6 +36,43 @@ __all__ = [
 ]
 
 
+class ProjectMergeRequestPipeline(RESTObject):
+    pass
+
+
+class ProjectMergeRequestPipelineManager(CreateMixin, ListMixin, RESTManager):
+    _path = "/projects/%(project_id)s/merge_requests/%(mr_iid)s/pipelines"
+    _obj_cls = ProjectMergeRequestPipeline
+    _from_parent_attrs = {"project_id": "project_id", "mr_iid": "iid"}
+
+    # If the manager was called directly as a callable via
+    # mr.pipelines(), execute the deprecated method for now.
+    # TODO: in python-gitlab 3.0.0, remove this method entirely.
+
+    @cli.register_custom_action("ProjectMergeRequest", custom_action="pipelines")
+    @exc.on_http_error(exc.GitlabListError)
+    def __call__(self, **kwargs):
+        """List the merge request pipelines.
+
+        Args:
+            **kwargs: Extra options to send to the server (e.g. sudo)
+
+        Raises:
+            GitlabAuthenticationError: If authentication is not correct
+            GitlabListError: If the list could not be retrieved
+
+        Returns:
+            RESTObjectList: List of changes
+        """
+        warnings.warn(
+            "Calling the ProjectMergeRequest.pipelines() method on "
+            "merge request objects directly is deprecated and will be replaced "
+            "by ProjectMergeRequest.pipelines.list() in python-gitlab 3.0.0.\n",
+            DeprecationWarning,
+        )
+        return self.list(**kwargs)
+
+
 class ProjectPipeline(RefreshMixin, ObjectDeleteMixin, RESTObject):
     _managers = (
         ("jobs", "ProjectPipelineJobManager"),