lib/license_finder/diff.rb
# frozen_string_literal: true
module LicenseFinder
class Diff
class << self
def compare(file1, file2)
p1 = Set.new(build_packages(file1))
p2 = Set.new(build_packages(file2))
added = p2.difference(p1).to_a
removed = p1.difference(p2).to_a
unchanged = p1.intersection(p2).to_a
[].tap do |packages|
unchanged.each do |package|
package_previous = find_package(p1, package)
package_current = find_package(p2, package)
if package_current.licenses == package_previous.licenses
packages << PackageDelta.unchanged(package_current, package_previous)
else
packages << PackageDelta.removed(package_previous)
packages << PackageDelta.added(package_current)
end
end
added.each { |package| packages << PackageDelta.added(package) }
removed.each { |package| packages << PackageDelta.removed(package) }
end
end
private
def build_packages(content)
CSV.parse(content).map do |row|
row.map!(&:strip)
package = Package.new(row[0], row[1], spec_licenses: [row[2]])
if row.count == 4
MergedPackage.new(package, row[3].split(','))
else
package
end
end
end
def find_package(set, package)
set.find { |p| p.eql? package }
end
end
end
end