1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
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::SourceIndex.from_installed_gems.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'
return File.join(Gem.dir, 'cache', filename)
else
return nil
end
end
end
|
