def which_to_update(highest_installed_gems, gem_names)
result = []
highest_installed_gems.each do |l_name, l_spec|
next if not gem_names.empty? and
gem_names.all? { |name| /#{name}/ !~ l_spec.name }
dependency = Gem::Dependency.new l_spec.name, "> #{l_spec.version}"
begin
fetcher = Gem::SpecFetcher.fetcher
spec_tuples = fetcher.find_matching dependency
rescue Gem::RemoteFetcher::FetchError => e
raise unless fetcher.warn_legacy e do
require 'rubygems/source_info_cache'
dependency.name = '' if dependency.name == //
specs = Gem::SourceInfoCache.search_with_source dependency
spec_tuples = specs.map do |spec, source_uri|
[[spec.name, spec.version, spec.original_platform], source_uri]
end
end
end
matching_gems = spec_tuples.select do |(name, version, platform),|
name == l_name and Gem::Platform.match platform
end
highest_remote_gem = matching_gems.sort_by do |(name, version),|
version
end.last
if highest_remote_gem and
l_spec.version < highest_remote_gem.first[1] then
result << l_name
end
end
result
end