module Mixlib::ShellOut::Windows::Utils

def self.find_executable(path)
  return path if File.executable? path
  pathext.each do |ext|
    exe = "#{path}#{ext}"
    return exe if File.executable? exe
  end
  return nil
end

def self.pathext
  @pathext ||= ENV['PATHEXT'] ? ENV['PATHEXT'].split(';') + [''] : ['']
end

def self.should_run_under_cmd?(command)
  return true if command =~ /^@/
  quote = nil
  env = false
  env_first_char = false
  command.dup.each_char do |c|
    case c
    when "'", '"'
      if (!quote)
        quote = c
      elsif quote == c
        quote = nil
      end
      next
    when '>', '<', '|', '&', "\n"
      return true unless quote
    when '%'
      return true if env
      env = env_first_char = true
      next
    else
      next unless env
      if env_first_char
        env_first_char = false
        env = false and next if c !~ /[A-Za-z_]/
      end
      env = false if c !~ /[A-Za-z1-9_]/
    end
  end
  return false
end

def self.which(cmd)
  ENV['PATH'].split(File::PATH_SEPARATOR).each do |path|
    exe = find_executable("#{path}/#{cmd}")
    return exe if exe
  end
  return nil
end