Support group and global MR listing

Closes #553

docs/gl_objects/mrs.rst

@@ -5,6 +5,48 @@ Merge requests
 You can use merge requests to notify a project that a branch is ready for
 merging. The owner of the target projet can accept the merge request.
 
+Merge requests are linked to projects, but they can be listed globally or for
+groups.
+
+Group and global listing
+========================
+
+Reference
+---------
+
+* v4 API:
+
+  + :class:`gitlab.v4.objects.GroupMergeRequest`
+  + :class:`gitlab.v4.objects.GroupMergeRequestManager`
+  + :attr:`gitlab.v4.objects.Group.mergerequests`
+  + :class:`gitlab.v4.objects.MergeRequest`
+  + :class:`gitlab.v4.objects.MergeRequestManager`
+  + :attr:`gitlab.Gtilab.mergerequests`
+
+* GitLab API: https://docs.gitlab.com/ce/api/merge_requests.html
+
+Examples
+--------
+
+List the merge requests available on the GitLab server::
+
+    mrs = gl.mergerequests.list()
+
+List the merge requests for a group::
+
+    group = gl.groups.get('mygroup')
+    mrs = group.mergerequests.list()
+
+To edit or delete a merge request, create a ``ProjectMergeRequest`` object
+first::
+
+    mr = group.mergerequests.list()[0]  # pick the first MR
+    project = gl.projects.get(mr.project_id, lazy=True)
+    editable_mr = project.mergerequests.get(mr.iid)
+
+Project merge requests
+======================
+
 Reference
 ---------
 

gitlab/__init__.py

@@ -114,6 +114,7 @@ def __init__(self, url, private_token=None, oauth_token=None, email=None,
         self.ldapgroups = objects.LDAPGroupManager(self)
         self.licenses = objects.LicenseManager(self)
         self.namespaces = objects.NamespaceManager(self)
+        self.mergerequests = objects.MergeRequestManager(self)
         self.notificationsettings = objects.NotificationSettingsManager(self)
         self.projects = objects.ProjectManager(self)
         self.runners = objects.RunnerManager(self)

gitlab/v4/objects.py

@@ -710,8 +710,16 @@ class GroupMergeRequest(RESTObject):
     pass
 
 
-class GroupMergeRequestManager(RESTManager):
-    pass
+class GroupMergeRequestManager(ListMixin, RESTManager):
+    _path = '/groups/%(group_id)s/merge_requests'
+    _obj_cls = GroupMergeRequest
+    _from_parent_attrs = {'group_id': 'id'}
+    _list_filters = ('state', 'order_by', 'sort', 'milestone', 'view',
+                     'labels', 'created_after', 'created_before',
+                     'updated_after', 'updated_before', 'scope', 'author_id',
+                     'assignee_id', 'my_reaction_emoji', 'source_branch',
+                     'target_branch', 'search')
+    _types = {'labels': types.ListAttribute}
 
 
 class GroupMilestone(SaveMixin, ObjectDeleteMixin, RESTObject):
@@ -842,6 +850,7 @@ class Group(SaveMixin, ObjectDeleteMixin, RESTObject):
         ('epics', 'GroupEpicManager'),
         ('issues', 'GroupIssueManager'),
         ('members', 'GroupMemberManager'),
+        ('mergerequests', 'GroupMergeRequestManager'),
         ('milestones', 'GroupMilestoneManager'),
         ('notificationsettings', 'GroupNotificationSettingsManager'),
         ('projects', 'GroupProjectManager'),
@@ -1040,6 +1049,22 @@ class LicenseManager(RetrieveMixin, RESTManager):
     _optional_get_attrs = ('project', 'fullname')
 
 
+class MergeRequest(RESTObject):
+    pass
+
+
+class MergeRequestManager(ListMixin, RESTManager):
+    _path = '/merge_requests'
+    _obj_cls = MergeRequest
+    _from_parent_attrs = {'group_id': 'id'}
+    _list_filters = ('state', 'order_by', 'sort', 'milestone', 'view',
+                     'labels', 'created_after', 'created_before',
+                     'updated_after', 'updated_before', 'scope', 'author_id',
+                     'assignee_id', 'my_reaction_emoji', 'source_branch',
+                     'target_branch', 'search')
+    _types = {'labels': types.ListAttribute}
+
+
 class Snippet(UserAgentDetailMixin, SaveMixin, ObjectDeleteMixin, RESTObject):
     _short_print_attr = 'title'