1 files changed, 207 insertions, 0 deletions
diff --git a/ruby_2_2/lib/rubygems/commands/dependency_command.rb b/ruby_2_2/lib/rubygems/commands/dependency_command.rb
new file mode 100644
index 0000000000..4a54a3e385
--- /dev/null
+++ b/ruby_2_2/lib/rubygems/commands/dependency_command.rb
@@ -0,0 +1,207 @@
+require 'rubygems/command'
+require 'rubygems/local_remote_options'
+require 'rubygems/version_option'
+
+class Gem::Commands::DependencyCommand < Gem::Command
+
+  include Gem::LocalRemoteOptions
+  include Gem::VersionOption
+
+  def initialize
+    super 'dependency',
+          'Show the dependencies of an installed gem',
+          :version => Gem::Requirement.default, :domain => :local
+
+    add_version_option
+    add_platform_option
+    add_prerelease_option
+
+    add_option('-R', '--[no-]reverse-dependencies',
+               'Include reverse dependencies in the output') do
+      |value, options|
+      options[:reverse_dependencies] = value
+    end
+
+    add_option('-p', '--pipe',
+               "Pipe Format (name --version ver)") do |value, options|
+      options[:pipe_format] = value
+    end
+
+    add_local_remote_options
+  end
+
+  def arguments # :nodoc:
+    "REGEXP        show dependencies for gems whose names start with REGEXP"
+  end
+
+  def defaults_str # :nodoc:
+    "--local --version '#{Gem::Requirement.default}' --no-reverse-dependencies"
+  end
+
+  def description # :nodoc:
+    <<-EOF
+The dependency commands lists which other gems a given gem depends on.  For
+local gems only the reverse dependencies can be shown (which gems depend on
+the named gem).
+
+The dependency list can be displayed in a format suitable for piping for
+use with other commands.
+    EOF
+  end
+
+  def usage # :nodoc:
+    "#{program_name} REGEXP"
+  end
+
+  def fetch_remote_specs dependency # :nodoc:
+    fetcher = Gem::SpecFetcher.fetcher
+
+    ss, = fetcher.spec_for_dependency dependency
+
+    ss.map { |spec, _| spec }
+  end
+
+  def fetch_specs dependency # :nodoc:
+    specs = []
+
+    specs.concat dependency.matching_specs     if local?
+    specs.concat fetch_remote_specs dependency if remote?
+
+    ensure_specs specs
+
+    specs.uniq.sort
+  end
+
+  def gem_dependency args, version, prerelease # :nodoc:
+    args << '' if args.empty?
+
+    pattern = if args.length == 1 and args.first =~ /\A\/(.*)\/(i)?\z/m then
+                flags = $2 ? Regexp::IGNORECASE : nil
+                Regexp.new $1, flags
+              else
+                /\A#{Regexp.union(*args)}/
+              end
+
+    dependency = Gem::Deprecate.skip_during {
+      Gem::Dependency.new pattern, version
+    }
+
+    dependency.prerelease = prerelease
+
+    dependency
+  end
+
+  def display_pipe specs # :nodoc:
+    specs.each do |spec|
+      unless spec.dependencies.empty? then
+        spec.dependencies.sort_by { |dep| dep.name }.each do |dep|
+          say "#{dep.name} --version '#{dep.requirement}'"
+        end
+      end
+    end
+  end
+
+  def display_readable specs, reverse # :nodoc:
+    response = ''
+
+    specs.each do |spec|
+      response << print_dependencies(spec)
+      unless reverse[spec.full_name].empty? then
+        response << "  Used by\n"
+        reverse[spec.full_name].each do |sp, dep|
+          response << "    #{sp} (#{dep})\n"
+        end
+      end
+      response << "\n"
+    end
+
+    say response
+  end
+
+  def execute
+    ensure_local_only_reverse_dependencies
+
+    dependency =
+      gem_dependency options[:args], options[:version], options[:prerelease]
+
+    specs = fetch_specs dependency
+
+    reverse = reverse_dependencies specs
+
+    if options[:pipe_format] then
+      display_pipe specs
+    else
+      display_readable specs, reverse
+    end
+  end
+
+  def ensure_local_only_reverse_dependencies # :nodoc:
+    if options[:reverse_dependencies] and remote? and not local? then
+      alert_error 'Only reverse dependencies for local gems are supported.'
+      terminate_interaction 1
+    end
+  end
+
+  def ensure_specs specs # :nodoc:
+    return unless specs.empty?
+
+    patterns = options[:args].join ','
+    say "No gems found matching #{patterns} (#{options[:version]})" if
+      Gem.configuration.verbose
+
+    terminate_interaction 1
+  end
+
+  def print_dependencies(spec, level = 0) # :nodoc:
+    response = ''
+    response << '  ' * level + "Gem #{spec.full_name}\n"
+    unless spec.dependencies.empty? then
+      spec.dependencies.sort_by { |dep| dep.name }.each do |dep|
+        response << '  ' * level + "  #{dep}\n"
+      end
+    end
+    response
+  end
+
+  def remote_specs dependency # :nodoc:
+    fetcher = Gem::SpecFetcher.fetcher
+
+    ss, _ = fetcher.spec_for_dependency dependency
+
+    ss.map { |s,o| s }
+  end
+
+  def reverse_dependencies specs # :nodoc:
+    reverse = Hash.new { |h, k| h[k] = [] }
+
+    return reverse unless options[:reverse_dependencies]
+
+    specs.each do |spec|
+      reverse[spec.full_name] = find_reverse_dependencies spec
+    end
+
+    reverse
+  end
+
+  ##
+  # Returns an Array of [specification, dep] that are satisfied by +spec+.
+
+  def find_reverse_dependencies spec # :nodoc:
+    result = []
+
+    Gem::Specification.each do |sp|
+      sp.dependencies.each do |dep|
+        dep = Gem::Dependency.new(*dep) unless Gem::Dependency === dep
+
+        if spec.name == dep.name and
+           dep.requirement.satisfied_by?(spec.version) then
+          result << [sp.full_name, dep]
+        end
+      end
+    end
+
+    result
+  end
+
+end
+