Class: Gem::Commands::DependencyCommand

# File 'lib/rubygems/commands/dependency_command.rb', line 38

def defaults_str # :nodoc:
  "--local --version '#{Gem::Requirement.default}' --no-reverse-dependencies"
end

# File 'lib/rubygems/commands/dependency_command.rb', line 42

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

# File 'lib/rubygems/commands/dependency_command.rb', line 92

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

# File 'lib/rubygems/commands/dependency_command.rb', line 102

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

# File 'lib/rubygems/commands/dependency_command.rb', line 138

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

# File 'lib/rubygems/commands/dependency_command.rb', line 145

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

# File 'lib/rubygems/commands/dependency_command.rb', line 119

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

# File 'lib/rubygems/commands/dependency_command.rb', line 57

def fetch_remote_specs dependency # :nodoc:
  fetcher = Gem::SpecFetcher.fetcher

  ss, = fetcher.spec_for_dependency dependency

  ss.map { |spec, _| spec }
end

# File 'lib/rubygems/commands/dependency_command.rb', line 65

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

# File 'lib/rubygems/commands/dependency_command.rb', line 189

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

# File 'lib/rubygems/commands/dependency_command.rb', line 82

def gem_dependency pattern, version, prerelease # :nodoc:
  dependency = Gem::Deprecate.skip_during {
    Gem::Dependency.new pattern, version
  }

  dependency.prerelease = prerelease

  dependency
end

# File 'lib/rubygems/commands/dependency_command.rb', line 208

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

# File 'lib/rubygems/commands/dependency_command.rb', line 155

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

# File 'lib/rubygems/commands/dependency_command.rb', line 166

def remote_specs dependency # :nodoc:
  fetcher = Gem::SpecFetcher.fetcher

  ss, _ = fetcher.spec_for_dependency dependency

  ss.map { |s,o| s }
end

# File 'lib/rubygems/commands/dependency_command.rb', line 174

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

# File 'lib/rubygems/commands/dependency_command.rb', line 53

def usage # :nodoc:
  "#{program_name} REGEXP"
end