Windowsでwhich

whichがないと何かと不便。

whichはとっても便利なのになんで標準装備されていないのだろう・・・

#! ruby

def search_dir(result, target_path)
  puts "   #{target_path}" if $DEBUG
  Dir[target_path].each do |file|
    unless result.index(file)
      puts(file.gsub(/\//, '\\'))
      result << file
    end
  end
end

def main(args)
  if args.size == 0
    puts "Usage error: which keyword"
    exit
  end

  target = args[0]
  result = []

  (['.'] + ENV['PATH'].split(';')).each do |path|
    path.sub!(/^"*/, '').sub!(/"*$/, '')
    search_dir(result, File.expand_path(File.join(path, "#{target}")))
    search_dir(result, File.expand_path(File.join(path, "#{target}.*")))
  end
end

main(ARGV)