Merge remote-tracking branch 'upstream/master' into 27377-preload-pipeline-entity27377-preload-pipeline-entity

* upstream/master: (2534 commits)
  Update VERSION to 9.3.0-pre
  Update CHANGELOG.md for 9.2.0
  removes unnecessary redundacy in usage ping doc
  Respect the typo as rubocop said
  Add a test to ensure this works on MySQL
  Change pipelines schedules help page path
  change domain to hostname in usage ping doc
  Fixes broken MySQL migration for retried
  Show password field mask while editing service settings
  Add notes for supported schedulers and cloud providers
  Move environment monitoring to environments doc
  Add docs for change of Cache/Artifact restore order"
  Avoid resource intensive login checks if password is not provided
  Change translation for 'coding' by 'desarrollo' for Spanish
  Add to docs: issues multiple assignees
  rename "Add emoji" and "Award emoji" to "Add reaction" where appropriate
  Add project and group notification settings info
  32570 Fix border-bottom for project activity tab
  Add users endpoint to frontend API class
  Rename users on mysql
  ...

1 files changed, 172 insertions, 0 deletions

diff --git a/app/presenters/merge_request_presenter.rb b/app/presenters/merge_request_presenter.rb
new file mode 100644
index 00000000000..0db9e31031c
--- /dev/null
+++ b/app/presenters/merge_request_presenter.rb
@@ -0,0 +1,172 @@
+class MergeRequestPresenter < Gitlab::View::Presenter::Delegated
+  include ActionView::Helpers::UrlHelper
+  include GitlabRoutingHelper
+  include MarkupHelper
+  include TreeHelper
+
+  presents :merge_request
+
+  def ci_status
+    if pipeline
+      status = pipeline.status
+      status = "success_with_warnings" if pipeline.success? && pipeline.has_warnings?
+
+      status || "preparing"
+    else
+      ci_service = source_project.try(:ci_service)
+      ci_service&.commit_status(diff_head_sha, source_branch)
+    end
+  end
+
+  def cancel_merge_when_pipeline_succeeds_path
+    if can_cancel_merge_when_pipeline_succeeds?(current_user)
+      cancel_merge_when_pipeline_succeeds_namespace_project_merge_request_path(
+        project.namespace,
+        project,
+        merge_request)
+    end
+  end
+
+  def create_issue_to_resolve_discussions_path
+    if can?(current_user, :create_issue, project) && project.issues_enabled?
+      new_namespace_project_issue_path(project.namespace,
+                                       project,
+                                       merge_request_to_resolve_discussions_of: iid)
+    end
+  end
+
+  def remove_wip_path
+    if can?(current_user, :update_merge_request, merge_request.project)
+      remove_wip_namespace_project_merge_request_path(project.namespace, project, merge_request)
+    end
+  end
+
+  def merge_path
+    if can_be_merged_by?(current_user)
+      merge_namespace_project_merge_request_path(project.namespace, project, merge_request)
+    end
+  end
+
+  def revert_in_fork_path
+    if user_can_fork_project? && can_be_reverted?(current_user)
+      continue_params = {
+        to: merge_request_path(merge_request),
+        notice: "#{edit_in_new_fork_notice} Try to cherry-pick this commit again.",
+        notice_now: edit_in_new_fork_notice_now
+      }
+
+      namespace_project_forks_path(merge_request.project.namespace, merge_request.project,
+                                   namespace_key: current_user.namespace.id,
+                                   continue: continue_params)
+    end
+  end
+
+  def cherry_pick_in_fork_path
+    if user_can_fork_project? && can_be_cherry_picked?
+      continue_params = {
+        to: merge_request_path(merge_request),
+        notice: "#{edit_in_new_fork_notice} Try to revert this commit again.",
+        notice_now: edit_in_new_fork_notice_now
+      }
+
+      namespace_project_forks_path(project.namespace, project,
+                                   namespace_key: current_user.namespace.id,
+                                   continue: continue_params)
+    end
+  end
+
+  def conflict_resolution_path
+    if conflicts.can_be_resolved_in_ui? && conflicts.can_be_resolved_by?(current_user)
+      conflicts_namespace_project_merge_request_path(project.namespace, project, merge_request)
+    end
+  end
+
+  def target_branch_commits_path
+    if target_branch_exists?
+      namespace_project_commits_path(project.namespace, project, target_branch)
+    end
+  end
+
+  def source_branch_path
+    if source_branch_exists?
+      namespace_project_branch_path(source_project.namespace, source_project, source_branch)
+    end
+  end
+
+  def source_branch_with_namespace_link
+    namespace = source_project_namespace
+    branch = source_branch
+
+    if source_branch_exists?
+      namespace = link_to(namespace, project_path(source_project))
+      branch = link_to(branch, namespace_project_commits_path(source_project.namespace, source_project, source_branch))
+    end
+
+    if for_fork?
+      namespace + ":" + branch
+    else
+      branch
+    end
+  end
+
+  def closing_issues_links
+    markdown issues_sentence(project, closing_issues), pipeline: :gfm, author: author, project: project
+  end
+
+  def mentioned_issues_links
+    mentioned_issues = issues_mentioned_but_not_closing(current_user)
+    markdown issues_sentence(project, mentioned_issues), pipeline: :gfm, author: author, project: project
+  end
+
+  def assign_to_closing_issues_link
+    issues = MergeRequests::AssignIssuesService.new(project,
+                                                    current_user,
+                                                    merge_request: merge_request,
+                                                    closes_issues: closing_issues
+                                                   ).assignable_issues
+    path = assign_related_issues_namespace_project_merge_request_path(project.namespace, project, merge_request)
+    if issues.present?
+      pluralize_this_issue = issues.count > 1 ? "these issues" : "this issue"
+      link_to "Assign yourself to #{pluralize_this_issue}", path, method: :post
+    end
+  end
+
+  def can_revert_on_current_merge_request?
+    user_can_collaborate_with_project? && can_be_reverted?(current_user)
+  end
+
+  def can_cherry_pick_on_current_merge_request?
+    user_can_collaborate_with_project? && can_be_cherry_picked?
+  end
+
+  private
+
+  def conflicts
+    @conflicts ||= MergeRequests::Conflicts::ListService.new(merge_request)
+  end
+
+  def closing_issues
+    @closing_issues ||= closes_issues(current_user)
+  end
+
+  def pipeline
+    @pipeline ||= head_pipeline
+  end
+
+  def issues_sentence(project, issues)
+    # Sorting based on the `#123` or `group/project#123` reference will sort
+    # local issues first.
+    issues.map do |issue|
+      issue.to_reference(project)
+    end.sort.to_sentence
+  end
+
+  def user_can_collaborate_with_project?
+    can?(current_user, :push_code, project) ||
+      (current_user && current_user.already_forked?(project))
+  end
+
+  def user_can_fork_project?
+    can?(current_user, :fork_project, project)
+  end
+end