A ruby script that updates Carthage dependencies and only builds new ones

carthage_uin.rb

#!/usr/bin/env ruby
require 'pathname'
require 'fileutils'

if ARGV.first && ARGV.first.length > 0
  path = Pathname.new(ARGV.first).realpath()
  args = ARGV.drop(1).join(" ")
else
  path = Pathname.pwd()
  args = ARGV.join(" ")
end

puts path
resolved_path = path + "Cartfile.resolved"
resolved_old_path = path + "Cartfile.resolved.old"
if File.exists?(resolved_old_path)
  puts "Carfile.resolved.old already exists. Using that one."
end

if File.exists?(resolved_path)
  FileUtils.cp(resolved_path, resolved_old_path)
end

puts "Fetching dependencies"
puts `carthage update --project-directory #{path} --no-build --no-checkout #{args}`
puts "Comparing dependencies"

if File.exists?(resolved_old_path)
  old_deps = IO.readlines(resolved_old_path)
else
  old_deps = []
end

need_build = []
File.new(resolved_path).each do |line|
  need_build.push(line) unless old_deps.any? { |old| line == old }
end
puts "#{need_build.length()} need to be (re)build."

need_build.each {|d|
  puts d
}
deps = need_build.map { |d| /(?:^(?:git|github)\s\".+?\/(.+?)\")/.match(d)[1]  }
puts "Building #{deps.join(", ")}..." unless deps.empty?
puts `carthage update #{deps.join(" ")} #{args}` unless deps.empty?
puts "Deleting Carthage.resolved.old file"
if File.exists?(resolved_old_path)
  FileUtils.rm resolved_old_path
end