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77 lines
2.3 KiB
Ruby
77 lines
2.3 KiB
Ruby
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require 'fileutils'
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require 'rubygems/command'
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require 'rubygems/installer'
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require 'rubygems/version_option'
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class Gem::Commands::UnpackCommand < Gem::Command
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include Gem::VersionOption
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def initialize
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super 'unpack', 'Unpack an installed gem to the current directory',
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:version => Gem::Requirement.default
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add_version_option
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end
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def arguments # :nodoc:
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"GEMNAME name of gem to unpack"
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end
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def defaults_str # :nodoc:
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"--version '#{Gem::Requirement.default}'"
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end
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def usage # :nodoc:
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"#{program_name} GEMNAME"
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end
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#--
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# TODO: allow, e.g., 'gem unpack rake-0.3.1'. Find a general solution for
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# this, so that it works for uninstall as well. (And check other commands
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# at the same time.)
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def execute
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gemname = get_one_gem_name
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path = get_path(gemname, options[:version])
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if path
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target_dir = File.basename(path).sub(/\.gem$/, '')
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FileUtils.mkdir_p target_dir
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Gem::Installer.new(path).unpack(File.expand_path(target_dir))
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say "Unpacked gem: '#{target_dir}'"
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else
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alert_error "Gem '#{gemname}' not installed."
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end
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end
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# Return the full path to the cached gem file matching the given
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# name and version requirement. Returns 'nil' if no match.
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#
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# Example:
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#
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# get_path('rake', '> 0.4') # -> '/usr/lib/ruby/gems/1.8/cache/rake-0.4.2.gem'
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# get_path('rake', '< 0.1') # -> nil
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# get_path('rak') # -> nil (exact name required)
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#--
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# TODO: This should be refactored so that it's a general service. I don't
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# think any of our existing classes are the right place though. Just maybe
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# 'Cache'?
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#
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# TODO: It just uses Gem.dir for now. What's an easy way to get the list of
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# source directories?
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def get_path(gemname, version_req)
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return gemname if gemname =~ /\.gem$/i
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specs = Gem::SourceIndex.from_installed_gems.search(/\A#{gemname}\z/, version_req)
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selected = specs.sort_by { |s| s.version }.last
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return nil if selected.nil?
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# We expect to find (basename).gem in the 'cache' directory.
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# Furthermore, the name match must be exact (ignoring case).
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if gemname =~ /^#{selected.name}$/i
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filename = selected.full_name + '.gem'
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return File.join(Gem.dir, 'cache', filename)
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else
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return nil
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end
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end
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end
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