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# GemSupport offers methods to find a gem's location by name or gem://gemname URI.
#
# TODO: The Puppet 3x, uses Puppet::Util::RubyGems to do this, and obtain paths, and avoids using ::Gems
# when ::Bundler is in effect. A quick check what happens on Ruby 1.8.7 and Ruby 1.9.3 with current
# version of bundler seems to work just fine without jumping through any hoops. Hopefully the Puppet::Utils::RubyGems is
# just dealing with arcane things prior to RubyGems 1.8 that are not needed any more. To verify there is
# the need to set up a scenario where additional bundles than what Bundler allows for a given configuration are available
# and then trying to access those.
#
module Puppet::Pops::Loader::GemSupport
# Produces the root directory of a gem given as an URI (gem://gemname/optional/path), or just the
# gemname as a string.
#
def gem_dir(uri_or_string)
case uri_or_string
when URI
gem_dir_from_uri(uri_or_string)
when String
gem_dir_from_name(uri_or_string)
end
end
# Produces the root directory of a gem given as an uri, where hostname is the gemname, and an optional
# path is appended to the root of the gem (i.e. if the reference is given to a sub-location within a gem.
# TODO: FIND by name raises exception Gem::LoadError with list of all gems on the path
#
def gem_dir_from_uri(uri)
spec = Gem::Specification.find_by_name(uri.hostname)
unless spec
raise ArgumentError, _("Gem not found %{uri}") % { uri: uri }
end
# if path given append that, else append given subdir
if uri.path.empty?
spec.gem_dir
else
File.join(spec.full_gem_path, uri.path)
end
end
# Produces the root directory of a gem given as a string with the gem's name.
# TODO: FIND by name raises exception Gem::LoadError with list of all gems on the path
#
def gem_dir_from_name(gem_name)
spec = Gem::Specification.find_by_name(gem_name)
unless spec
raise ArgumentError, _("Gem not found '%{gem_name}'") % { gem_name: gem_name }
end
spec.full_gem_path
end
end
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