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