class Jeweler::Commands::CheckDependencies

def self.build_for(jeweler)
  command = new
  command.gemspec = jeweler.gemspec
  command
end

def dependencies
  case type
  when :runtime, :development
    gemspec.send("#{type}_dependencies")
  else
    gemspec.dependencies
  end
end

def find_missing_dependencies
  if Gem::Specification.respond_to?(:find_by_name)
    dependencies.select do |dependency|
      begin
        spec = Gem::Specification.find_by_name(dependency.name, *dependency.requirement.as_list)
        spec.activate if spec
        !spec
      rescue LoadError => e
        true
      end
    end
  else
    dependencies.select do |dependency|
      begin
        Gem.activate dependency.name, *dependency.requirement.as_list
        false
      rescue LoadError => e
        true
      end
    end
  end
end

def run
  missing_dependencies = find_missing_dependencies
  if missing_dependencies.empty?
    puts "#{type || 'All'} dependencies seem to be installed."
  else
    puts 'Missing some dependencies. Install them with the following commands:'
    missing_dependencies.each do |dependency|
      puts %(\tgem install #{dependency.name} --version "#{dependency.requirement}")
    end
    abort "Run the specified gem commands before trying to run this again: {$PROGRAM_NAME} #{ARGV.join(' ')}"
  end
end