module MergeRequests class BuildService < MergeRequests::BaseService def execute self.merge_request = MergeRequest.new(params) merge_request.compare_commits = [] merge_request.source_project = find_source_project merge_request.target_project = find_target_project merge_request.target_branch = find_target_branch merge_request.can_be_created = branches_valid? compare_branches if branches_present? assign_title_and_description if merge_request.can_be_created merge_request end private attr_accessor :merge_request delegate :target_branch, :source_branch, :source_project, :target_project, :compare_commits, :wip_title, :description, :errors, to: :merge_request def find_source_project return source_project if source_project.present? && can?(current_user, :read_project, source_project) project end def find_target_project return target_project if target_project.present? && can?(current_user, :read_project, target_project) project.default_merge_request_target end def find_target_branch target_branch || target_project.default_branch end def source_branch_specified? params[:source_branch].present? end def target_branch_specified? params[:target_branch].present? end def branches_valid? return false unless source_branch_specified? || target_branch_specified? validate_branches errors.blank? end def compare_branches compare = CompareService.new( source_project, source_branch ).execute( target_project, target_branch ) if compare merge_request.compare_commits = compare.commits merge_request.compare = compare end end def validate_branches add_error('You must select source and target branch') unless branches_present? add_error('You must select different branches') if same_source_and_target? add_error("Source branch \"#{source_branch}\" does not exist") unless source_branch_exists? add_error("Target branch \"#{target_branch}\" does not exist") unless target_branch_exists? end def add_error(message) errors.add(:base, message) end def branches_present? target_branch.present? && source_branch.present? end def same_source_and_target? source_project == target_project && target_branch == source_branch end def source_branch_exists? source_branch.blank? || source_project.commit(source_branch) end def target_branch_exists? target_branch.blank? || target_project.commit(target_branch) end # When your branch name starts with an iid followed by a dash this pattern will be # interpreted as the user wants to close that issue on this project. # # For example: # - Issue 112 exists, title: Emoji don't show up in commit title # - Source branch is: 112-fix-mep-mep # # Will lead to: # - Appending `Closes #112` to the description # - Setting the title as 'Resolves "Emoji don't show up in commit title"' if there is # more than one commit in the MR # def assign_title_and_description if match = source_branch.match(/\A(\d+)-/) iid = match[1] end commits = compare_commits if commits && commits.count == 1 commit = commits.first merge_request.title = commit.title merge_request.description ||= commit.description.try(:strip) elsif iid && issue = target_project.get_issue(iid, current_user) case issue when Issue merge_request.title = "Resolve \"#{issue.title}\"" when ExternalIssue merge_request.title = "Resolve #{issue.title}" end else merge_request.title = source_branch.titleize.humanize end if iid closes_issue = "Closes ##{iid}" if description.present? merge_request.description += closes_issue.prepend("\n\n") else merge_request.description = closes_issue end end merge_request.title = wip_title if commits.empty? end end end