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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', '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
#--
# 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
gemname = get_one_gem_name
path = get_path(gemname, options[:version])
if path then
basename = File.basename(path).sub(/\.gem$/, '')
target_dir = File.expand_path File.join(options[:target], basename)
FileUtils.mkdir_p target_dir
Gem::Installer.new(path).unpack target_dir
say "Unpacked gem: '#{target_dir}'"
else
alert_error "Gem '#{gemname}' not installed."
end
end
# Return the full path to the cached gem file matching the given
# name and version requirement. Returns 'nil' if no match.
#
# Example:
#
# get_path('rake', '> 0.4') # -> '/usr/lib/ruby/gems/1.8/cache/rake-0.4.2.gem'
# get_path('rake', '< 0.1') # -> nil
# get_path('rak') # -> nil (exact name required)
#--
# TODO: This should be refactored so that it's a general service. I don't
# think any of our existing classes are the right place though. Just maybe
# 'Cache'?
#
# TODO: It just uses Gem.dir for now. What's an easy way to get the list of
# source directories?
def get_path(gemname, version_req)
return gemname if gemname =~ /\.gem$/i
specs = Gem::source_index.search(/\A#{gemname}\z/, version_req)
selected = specs.sort_by { |s| s.version }.last
return nil if selected.nil?
# We expect to find (basename).gem in the 'cache' directory.
# Furthermore, the name match must be exact (ignoring case).
if gemname =~ /^#{selected.name}$/i
filename = selected.full_name + '.gem'
path = nil
Gem.path.find do |gem_dir|
path = File.join gem_dir, 'cache', filename
File.exist? path
end
path
else
nil
end
end
end
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