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# frozen_string_literal: true
require 'rugged'
require_relative 'commit_info'
module Booru
# Provides an interface to walk through the commit history
# of the application repository.
class CommitHistory
include Enumerable
# Creates a new history walker.
def initialize
#noinspection RubyArgCount
@repo = Rugged::Repository.new(Rails.root.to_s)
end
# @overload def each
# Creates an enumerator to the commit history.
# @return [Enumerable] An enumerator.
#
# @overload def each(&block)
# Walks the commit history, yielding a {CommitInfo}
# for each commit in turn.
# @return [Enumerable] An enumerator.
#
# @see CommitInfo
def each
# Nothing to call.
return self unless block_given?
#noinspection RubyArgCount
walker = Rugged::Walker.new(@repo)
walker.sorting(Rugged::SORT_TOPO)
walker.push('HEAD')
walker.each do |c|
# Commits with multiple parents are merge commits.
#
# Merge commits have multiple possible diffs, depending on which parent
# tree is visited, and are mostly irrelevant to actual changes in the
# state of the repository. They are ignored for the purposes of this
# application.
next if c.parents.size != 1
diff = c.parents[0].diff(c)
_, diff_insertions, diff_deletions = diff.stat
yield CommitInfo.new(
id: c.oid.to_s,
time: c.time,
name: c.author[:name],
email: c.author[:email],
message: c.message,
insertions: diff_insertions,
deletions: diff_deletions
)
end
self
end
end
end
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