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dependency_command.rb

# frozen_string_literal: true
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 name_pattern, dependency # :nodoc:
    specs = []

if local?
      specs.concat Gem::Specification.stubs.find_all { |spec|
        name_pattern =~ spec.name and
          dependency.requirement.satisfied_by? spec.version
      }.map(&:to_spec)
    end

specs.concat fetch_remote_specs dependency if remote?

ensure_specs specs

specs.uniq.sort
  end

def gem_dependency pattern, version, prerelease # :nodoc:
    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 = String.new

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

pattern = name_pattern options[:args]

dependency =
      gem_dependency pattern, options[:version], options[:prerelease]

specs = fetch_specs pattern, 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 = String.new
    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

private

def name_pattern args
    args << '' if args.empty?

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
  end
end

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