module Byebug::Helpers::BinHelper

def executable_file_extensions
  ENV["PATHEXT"] ? ENV["PATHEXT"].split(";") : [""]
end

def find_executable(path, cmd)
  executable_file_extensions.each do |ext|
    exe = File.expand_path(cmd + ext, path)
    return exe if real_executable?(exe)
  end
  nil
end

def real_executable?(f)
  File.executable?(f) && !File.directory?(f)
end

def search_paths
  ENV["PATH"].split(File::PATH_SEPARATOR)
end

def which(cmd)
  return File.expand_path(cmd) if File.exist?(cmd)
  [nil, *search_paths].each do |path|
    exe = find_executable(path, cmd)
    return exe if exe
  end
  nil
end