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# frozen_string_literal: true
module Repositories
# A finder class for getting the tag of the last release before a given
# version.
#
# Imagine a project with the following tags:
#
# * v1.0.0
# * v1.1.0
# * v2.0.0
#
# If the version supplied is 2.1.0, the tag returned will be v2.0.0. And when
# the version is 1.1.1, or 1.2.0, the returned tag will be v1.1.0.
#
# This finder expects that all tags to consider meet the following
# requirements:
#
# * They start with the letter "v" followed by a version, or immediately start
# with a version
# * They use semantic versioning for the version format
#
# Tags not meeting these requirements are ignored.
class PreviousTagFinder
TAG_REGEX = /\Av?(?<version>#{Gitlab::Regex.unbounded_semver_regex})\z/.freeze
def initialize(project)
@project = project
end
def execute(new_version)
tags = {}
versions = [new_version]
@project.repository.tags.each do |tag|
matches = tag.name.match(TAG_REGEX)
next unless matches
# When using this class for generating changelog data for a range of
# commits, we want to compare against the tag of the last _stable_
# release; not some random RC that came after that.
next if matches[:prerelease]
version = matches[:version]
tags[version] = tag
versions << version
end
VersionSorter.sort!(versions)
index = versions.index(new_version)
tags[versions[index - 1]] if index&.positive?
end
end
end
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