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# frozen_string_literal: true
module Gitlab
module MergeRequests
class CommitMessageGenerator
def initialize(merge_request:)
@merge_request = merge_request
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)
end
private
attr_reader :merge_request
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.presence || '' },
'reference' => ->(merge_request) { merge_request.to_reference(full: true) },
'first_commit' => -> (merge_request) { merge_request.first_commit&.safe_message&.strip.presence || '' },
'first_multiline_commit' => -> (merge_request) { merge_request.first_multiline_commit&.safe_message&.strip.presence || merge_request.title }
}.freeze
PLACEHOLDERS_REGEX = Regexp.union(PLACEHOLDERS.keys.map do |key|
Regexp.new(Regexp.escape(key))
end).freeze
BLANK_PLACEHOLDERS_REGEXES = (PLACEHOLDERS.map do |key, value|
[key, Regexp.new("[\n\r]+%{#{Regexp.escape(key)}}$")]
end).to_h.freeze
def replace_placeholders(message)
# convert CRLF to LF
message = message.delete("\r")
# Remove placeholders that correspond to empty values and are the last word in the line
# along with all whitespace characters preceding them.
# This allows us to recreate previous default merge commit message behaviour - we skipped new line character
# before empty description and before closed issues when none were present.
PLACEHOLDERS.each do |key, value|
unless value.call(merge_request).present?
message = message.gsub(BLANK_PLACEHOLDERS_REGEXES[key], '')
end
end
Gitlab::StringPlaceholderReplacer
.replace_string_placeholders(message, PLACEHOLDERS_REGEX) do |key|
PLACEHOLDERS[key].call(merge_request)
end
end
end
end
end
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