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module MergeRequests
class BuildService < MergeRequests::BaseService
def execute
merge_request = MergeRequest.new(params)
# Set MR attributes
merge_request.can_be_created = true
merge_request.compare_commits = []
merge_request.source_project = project unless merge_request.source_project
merge_request.target_project = nil unless can?(current_user, :read_project, merge_request.target_project)
merge_request.target_project ||= (project.forked_from_project || project)
merge_request.target_branch ||= merge_request.target_project.default_branch
messages = validate_branches(merge_request)
return build_failed(merge_request, messages) unless messages.empty?
compare = CompareService.new.execute(
merge_request.source_project,
merge_request.source_branch,
merge_request.target_project,
merge_request.target_branch,
)
merge_request.compare_commits = compare.commits
merge_request.compare = compare
set_title_and_description(merge_request)
end
private
def validate_branches(merge_request)
messages = []
if merge_request.target_branch.blank? || merge_request.source_branch.blank?
messages <<
if params[:source_branch] || params[:target_branch]
"You must select source and target branch"
end
end
if merge_request.source_project == merge_request.target_project &&
merge_request.target_branch == merge_request.source_branch
messages << 'You must select different branches'
end
# See if source and target branches exist
if merge_request.source_branch.present? && !merge_request.source_project.commit(merge_request.source_branch)
messages << "Source branch \"#{merge_request.source_branch}\" does not exist"
end
if merge_request.target_branch.present? && !merge_request.target_project.commit(merge_request.target_branch)
messages << "Target branch \"#{merge_request.target_branch}\" does not exist"
end
messages
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 set_title_and_description(merge_request)
if match = merge_request.source_branch.match(/\A(\d+)-/)
iid = match[1]
end
commits = merge_request.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 = merge_request.target_project.get_issue(iid)) && !issue.try(:confidential?)
case issue
when Issue
merge_request.title = "Resolve \"#{issue.title}\""
when ExternalIssue
merge_request.title = "Resolve #{issue.title}"
end
else
merge_request.title = merge_request.source_branch.titleize.humanize
end
if iid
closes_issue = "Closes ##{iid}"
if merge_request.description.present?
merge_request.description += closes_issue.prepend("\n\n")
else
merge_request.description = closes_issue
end
end
merge_request.title = merge_request.wip_title if commits.empty?
merge_request
end
def build_failed(merge_request, messages)
messages.compact.each do |message|
merge_request.errors.add(:base, message)
end
merge_request.compare_commits = []
merge_request.can_be_created = false
merge_request
end
end
end
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