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# frozen_string_literal: true
module Gitlab
module MergeRequests
class CommitMessageGenerator
def initialize(merge_request:, current_user:)
@merge_request = merge_request
@current_user = @merge_request.metrics&.merged_by || @merge_request.merge_user || current_user
end
def merge_message
return unless @merge_request.target_project.merge_commit_template.present?
replace_placeholders(@merge_request.target_project.merge_commit_template)
end
def squash_message
return unless @merge_request.target_project.squash_commit_template.present?
replace_placeholders(@merge_request.target_project.squash_commit_template, squash: true)
end
private
attr_reader :merge_request
attr_reader :current_user
PLACEHOLDERS = {
'source_branch' => ->(merge_request, _, _) { merge_request.source_branch.to_s },
'target_branch' => ->(merge_request, _, _) { merge_request.target_branch.to_s },
'title' => ->(merge_request, _, _) { merge_request.title },
'issues' => ->(merge_request, _, _) do
return if merge_request.visible_closing_issues_for.blank?
closes_issues_references = merge_request.visible_closing_issues_for.map do |issue|
issue.to_reference(merge_request.target_project)
end
"Closes #{closes_issues_references.to_sentence}"
end,
'description' => ->(merge_request, _, _) { merge_request.description },
'reference' => ->(merge_request, _, _) { merge_request.to_reference(full: true) },
'first_commit' => -> (merge_request, _, _) { merge_request.first_commit&.safe_message&.strip },
'first_multiline_commit' => -> (merge_request, _, _) { merge_request.first_multiline_commit&.safe_message&.strip.presence || merge_request.title },
'url' => ->(merge_request, _, _) { Gitlab::UrlBuilder.build(merge_request) },
'approved_by' => ->(merge_request, _, _) { merge_request.approved_by_users.map { |user| "Approved-by: #{user.name} <#{user.commit_email_or_default}>" }.join("\n") },
'merged_by' => ->(_, user, _) { "#{user&.name} <#{user&.commit_email_or_default}>" },
'co_authored_by' => ->(merge_request, merged_by, squash) do
commit_author = squash ? merge_request.author : merged_by
merge_request.recent_commits
.to_h { |commit| [commit.author_email, commit.author_name] }
.except(commit_author&.commit_email_or_default)
.map { |author_email, author_name| "Co-authored-by: #{author_name} <#{author_email}>" }
.join("\n")
end
}.freeze
PLACEHOLDERS_COMBINED_REGEX = /%{(#{Regexp.union(PLACEHOLDERS.keys)})}/.freeze
def replace_placeholders(message, squash: false)
# Convert CRLF to LF.
message = message.delete("\r")
used_variables = message.scan(PLACEHOLDERS_COMBINED_REGEX).map { |value| value[0] }.uniq
values = used_variables.to_h do |variable_name|
["%{#{variable_name}}", PLACEHOLDERS[variable_name].call(merge_request, current_user, squash)]
end
names_of_empty_variables = values.filter_map { |name, value| name if value.blank? }
# Remove lines that contain empty variable placeholder and nothing else.
if names_of_empty_variables.present?
# If there is blank line or EOF after it, remove blank line before it as well.
message = message.gsub(/\n\n#{Regexp.union(names_of_empty_variables)}(\n\n|\Z)/, '\1')
# Otherwise, remove only the line it is in.
message = message.gsub(/^#{Regexp.union(names_of_empty_variables)}\n/, '')
end
# Substitute all variables with their values.
message = message.gsub(Regexp.union(values.keys), values) if values.present?
message
end
end
end
end
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