1require 'rubygems/command'
2require 'rubygems/local_remote_options'
3require 'rubygems/version_option'
4
5class Gem::Commands::DependencyCommand < Gem::Command
6
7  include Gem::LocalRemoteOptions
8  include Gem::VersionOption
9
10  def initialize
11    super 'dependency',
12          'Show the dependencies of an installed gem',
13          :version => Gem::Requirement.default, :domain => :local
14
15    add_version_option
16    add_platform_option
17    add_prerelease_option
18
19    add_option('-R', '--[no-]reverse-dependencies',
20               'Include reverse dependencies in the output') do
21      |value, options|
22      options[:reverse_dependencies] = value
23    end
24
25    add_option('-p', '--pipe',
26               "Pipe Format (name --version ver)") do |value, options|
27      options[:pipe_format] = value
28    end
29
30    add_local_remote_options
31  end
32
33  def arguments # :nodoc:
34    "GEMNAME       name of gem to show dependencies for"
35  end
36
37  def defaults_str # :nodoc:
38    "--local --version '#{Gem::Requirement.default}' --no-reverse-dependencies"
39  end
40
41  def usage # :nodoc:
42    "#{program_name} GEMNAME"
43  end
44
45  def execute
46    if options[:reverse_dependencies] and remote? and not local? then
47      alert_error 'Only reverse dependencies for local gems are supported.'
48      terminate_interaction 1
49    end
50
51    options[:args] << '' if options[:args].empty?
52
53    pattern = if options[:args].length == 1 and
54                 options[:args].first =~ /\A\/(.*)\/(i)?\z/m then
55                flags = $2 ? Regexp::IGNORECASE : nil
56                Regexp.new $1, flags
57              else
58                /\A#{Regexp.union(*options[:args])}/
59              end
60
61    # TODO: deprecate for real damnit
62    dependency = Gem::Deprecate.skip_during {
63      Gem::Dependency.new pattern, options[:version]
64    }
65    dependency.prerelease = options[:prerelease]
66
67    specs = []
68
69    specs.concat dependency.matching_specs if local?
70
71    if remote? and not options[:reverse_dependencies] then
72      fetcher = Gem::SpecFetcher.fetcher
73
74      ss, _ = fetcher.spec_for_dependency dependency
75
76      ss.each { |s,o| specs << s }
77    end
78
79    if specs.empty? then
80      patterns = options[:args].join ','
81      say "No gems found matching #{patterns} (#{options[:version]})" if
82        Gem.configuration.verbose
83
84      terminate_interaction 1
85    end
86
87    specs = specs.uniq.sort
88
89    reverse = Hash.new { |h, k| h[k] = [] }
90
91    if options[:reverse_dependencies] then
92      specs.each do |spec|
93        reverse[spec.full_name] = find_reverse_dependencies spec
94      end
95    end
96
97    if options[:pipe_format] then
98      specs.each do |spec|
99        unless spec.dependencies.empty?
100          spec.dependencies.sort_by { |dep| dep.name }.each do |dep|
101            say "#{dep.name} --version '#{dep.requirement}'"
102          end
103        end
104      end
105    else
106      response = ''
107
108      specs.each do |spec|
109        response << print_dependencies(spec)
110        unless reverse[spec.full_name].empty? then
111          response << "  Used by\n"
112          reverse[spec.full_name].each do |sp, dep|
113            response << "    #{sp} (#{dep})\n"
114          end
115        end
116        response << "\n"
117      end
118
119      say response
120    end
121  end
122
123  def print_dependencies(spec, level = 0)
124    response = ''
125    response << '  ' * level + "Gem #{spec.full_name}\n"
126    unless spec.dependencies.empty? then
127      spec.dependencies.sort_by { |dep| dep.name }.each do |dep|
128        response << '  ' * level + "  #{dep}\n"
129      end
130    end
131    response
132  end
133
134  ##
135  # Returns an Array of [specification, dep] that are satisfied by +spec+.
136
137  def find_reverse_dependencies(spec)
138    result = []
139
140    Gem::Specification.each do |sp|
141      sp.dependencies.each do |dep|
142        dep = Gem::Dependency.new(*dep) unless Gem::Dependency === dep
143
144        if spec.name == dep.name and
145           dep.requirement.satisfied_by?(spec.version) then
146          result << [sp.full_name, dep]
147        end
148      end
149    end
150
151    result
152  end
153
154end
155
156