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module Gem
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class << self
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##
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# Returns a string representing that part or the directory tree that is
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# common to all specified directories.
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def common_path(dirs)
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paths = dirs.collect {|dir| dir.split(File::SEPARATOR)}
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uncommon_idx = paths.transpose.each_with_index.find {|dirnames, idx| dirnames.uniq.length > 1}.last
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paths[0][0 ... uncommon_idx].join(File::SEPARATOR)
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end
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private :common_path
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##
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# Default gems locations allowed on FHS system (/usr, /usr/share).
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# The locations are derived from directories specified during build
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# configuration.
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def default_locations
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@default_locations ||= {
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:system => common_path([ConfigMap[:vendorlibdir], ConfigMap[:vendorarchdir]]),
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:local => common_path([ConfigMap[:sitelibdir], ConfigMap[:sitearchdir]])
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}
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end
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##
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# For each location provides set of directories for binaries (:bin_dir)
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# platform independent (:gem_dir) and dependent (:ext_dir) files.
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def default_dirs
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@default_dirs ||= Hash[default_locations.collect do |destination, path|
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[destination, {
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:bin_dir => File.join(path, ConfigMap[:bindir].split(File::SEPARATOR).last),
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:gem_dir => File.join(path, ConfigMap[:datadir].split(File::SEPARATOR).last, 'gems'),
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:ext_dir => File.join(path, ConfigMap[:libdir].split(File::SEPARATOR).last, 'gems')
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}]
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end]
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end
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##
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# RubyGems default overrides.
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def default_dir
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if Process.uid == 0
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Gem.default_dirs[:local][:gem_dir]
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else
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Gem.user_dir
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end
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end
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def default_path
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path = default_dirs.collect {|location, paths| paths[:gem_dir]}
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path.unshift Gem.user_dir if File.exist? Gem.user_home
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end
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def default_bindir
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if Process.uid == 0
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Gem.default_dirs[:local][:bin_dir]
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else
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File.join [Dir.home, 'bin']
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end
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end
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def default_ext_dir_for base_dir
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dirs = Gem.default_dirs.detect {|location, paths| paths[:gem_dir] == base_dir}
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dirs && File.join(dirs.last[:ext_dir], 'exts')
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end
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end
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end
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