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✏️ Editing: which_command.rb Read Only

# frozen_string_literal: true
require 'rubygems/command'

class Gem::Commands::WhichCommand < Gem::Command

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

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

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

def description # :nodoc:
    <<-EOF
The which command is like the shell which command and shows you where
the file you wish to require lives.

You can use the which command to help determine why you are requiring a
version you did not expect or to look at the content of a file you are
requiring to see why it does not behave as you expect.
    EOF
  end

def execute
    found = true

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

spec = Gem::Specification.find_by_path arg

if spec
        if options[:search_gems_first]
          dirs = spec.full_require_paths + $LOAD_PATH
        else
          dirs = $LOAD_PATH + spec.full_require_paths
        end
      end

paths = find_paths arg, dirs

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

terminate_interaction 1 unless found
  end

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
          result << full_path
          return result unless options[:show_all]
        end
      end
    end

result
  end

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

end

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