1 files changed, 168 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..255f63db5c2
--- /dev/null
+++ b/app/presenters/merge_request_presenter.rb
@@ -0,0 +1,168 @@
+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 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