Class: Gem::Commands::WhichCommand

Inherits:
Gem::Command show all
Defined in:
lib/rubygems/commands/which_command.rb

Instance Attribute Summary

Attributes inherited from Gem::Command

#command, #defaults, #options, #program_name, #summary

Instance Method Summary collapse

Methods inherited from Gem::Command

add_common_option, #add_extra_args, #add_option, add_specific_extra_args, #begins?, build_args, build_args=, common_options, #description, extra_args, extra_args=, #get_all_gem_names, #get_all_gem_names_and_versions, #get_one_gem_name, #get_one_optional_argument, #handle_options, #handles?, #invoke, #invoke_with_build_args, #merge_options, #remove_option, #show_help, #show_lookup_failure, specific_extra_args, specific_extra_args_hash, #when_invoked

Methods included from UserInteraction

#alert, #alert_error, #alert_warning, #ask, #ask_for_password, #ask_yes_no, #choose_from_list, #say, #terminate_interaction

Methods included from DefaultUserInteraction

ui, #ui, ui=, #ui=, use_ui, #use_ui

Constructor Details

#initialize ⇒ WhichCommand

Returns a new instance of WhichCommand.



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# File 'lib/rubygems/commands/which_command.rb', line 4

def initialize
  super 'which', 'Find the location of a library file you can require',
        :search_gems_first => false, :show_all => false

  add_option '-a', '--[no-]all', 'show all matching files' do |show_all, options|
    options[:show_all] = show_all
  end

  add_option '-g', '--[no-]gems-first',
             'search gems before non-gems' do |gems_first, options|
    options[:search_gems_first] = gems_first
  end
end

Instance Method Details

#arguments ⇒ Object

:nodoc:



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# File 'lib/rubygems/commands/which_command.rb', line 18

def arguments # :nodoc:
  "FILE          name of file to find"
end

#defaults_str ⇒ Object

:nodoc:



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# File 'lib/rubygems/commands/which_command.rb', line 22

def defaults_str # :nodoc:
  "--no-gems-first --no-all"
end

#execute ⇒ Object 



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# File 'lib/rubygems/commands/which_command.rb', line 26

def execute
  found = false

  options[:args].each do |arg|
    arg = arg.sub(/#{Regexp.union(*Gem.suffixes)}$/, '')
    dirs = $LOAD_PATH

    spec = Gem::Specification.find_by_path arg

    if spec then
      if options[:search_gems_first] then
        dirs = gem_paths(spec) + $LOAD_PATH
      else
        dirs = $LOAD_PATH + gem_paths(spec)
      end
    end

    # TODO: this is totally redundant and stupid
    paths = find_paths arg, dirs

    if paths.empty? then
      alert_error "Can't find ruby library file or shared library #{arg}"
    else
      say paths
      found = true
    end
  end

  terminate_interaction 1 unless found
end

#find_paths(package_name, dirs) ⇒ Object 



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

def find_paths(package_name, dirs)
  result = []

  dirs.each do |dir|
    Gem.suffixes.each do |ext|
      full_path = File.join dir, "#{package_name}#{ext}"
      if File.exist? full_path and not File.directory? full_path then
        result << full_path
        return result unless options[:show_all]
      end
    end
  end

  result
end

#gem_paths(spec) ⇒ Object 



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# File 'lib/rubygems/commands/which_command.rb', line 73

def gem_paths(spec)
  spec.require_paths.collect { |d| File.join spec.full_gem_path, d }
end

#usage ⇒ Object

:nodoc:



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# File 'lib/rubygems/commands/which_command.rb', line 77

def usage # :nodoc:
  "#{program_name} FILE [FILE ...]"
end