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+#
+#   shell.rb -
+#       $Release Version: 0.7 $
+#       $Revision: 1.9 $
+#       by Keiju ISHITSUKA(keiju@ruby-lang.org)
+#
+# --
+#
+#
+#
+
+require "e2mmap"
+
+require "thread" unless defined?(Mutex)
+
+require "forwardable"
+
+require "shell/error"
+require "shell/command-processor"
+require "shell/process-controller"
+
+# Shell implements an idiomatic Ruby interface for common UNIX shell commands.
+#
+# It provides users the ability to execute commands with filters and pipes,
+# like +sh+/+csh+ by using native facilities of Ruby.
+#
+# == Examples
+#
+# === Temp file creation
+#
+# In this example we will create three +tmpFile+'s in three different folders
+# under the +/tmp+ directory.
+#
+#   sh = Shell.cd("/tmp") # Change to the /tmp directory
+#   sh.mkdir "shell-test-1" unless sh.exists?("shell-test-1")
+#   # make the 'shell-test-1' directory if it doesn't already exist
+#   sh.cd("shell-test-1") # Change to the /tmp/shell-test-1 directory
+#   for dir in ["dir1", "dir3", "dir5"]
+#     if !sh.exists?(dir)
+#       sh.mkdir dir # make dir if it doesn't already exist
+#       sh.cd(dir) do
+#         # change to the `dir` directory
+# 	  f = sh.open("tmpFile", "w") # open a new file in write mode
+# 	  f.print "TEST\n"            # write to the file
+# 	  f.close                     # close the file handler
+#       end
+#       print sh.pwd                  # output the process working directory
+#     end
+#   end
+#
+# === Temp file creation with self
+#
+# This example is identical to the first, except we're using
+# CommandProcessor#transact.
+#
+# CommandProcessor#transact executes the given block against self, in this case
+# +sh+; our Shell object. Within the block we can substitute +sh.cd+ to +cd+,
+# because the scope within the block uses +sh+ already.
+#
+#   sh = Shell.cd("/tmp")
+#   sh.transact do
+#     mkdir "shell-test-1" unless exists?("shell-test-1")
+#     cd("shell-test-1")
+#     for dir in ["dir1", "dir3", "dir5"]
+#       if !exists?(dir)
+# 	  mkdir dir
+# 	  cd(dir) do
+# 	    f = open("tmpFile", "w")
+# 	    f.print "TEST\n"
+# 	    f.close
+# 	  end
+# 	  print pwd
+#       end
+#     end
+#   end
+#
+# === Pipe /etc/printcap into a file
+#
+# In this example we will read the operating system file +/etc/printcap+,
+# generated by +cupsd+, and then output it to a new file relative to the +pwd+
+# of +sh+.
+#
+#   sh = Shell.new
+#   sh.cat("/etc/printcap") | sh.tee("tee1") > "tee2"
+#   (sh.cat < "/etc/printcap") | sh.tee("tee11") > "tee12"
+#   sh.cat("/etc/printcap") | sh.tee("tee1") >> "tee2"
+#   (sh.cat < "/etc/printcap") | sh.tee("tee11") >> "tee12"
+#
+class Shell
+
+  include Error
+  extend Exception2MessageMapper
+
+  # debug: true -> normal debug
+  # debug: 1    -> eval definition debug
+  # debug: 2    -> detail inspect debug
+  @debug = false
+  @verbose = true
+
+  @debug_display_process_id = false
+  @debug_display_thread_id = true
+  @debug_output_mutex = Mutex.new
+
+  class << Shell
+    extend Forwardable
+
+    attr_accessor :cascade, :debug, :verbose
+
+    alias debug? debug
+    alias verbose? verbose
+    @verbose = true
+
+    def debug=(val)
+      @debug = val
+      @verbose = val if val
+    end
+
+
+    # call-seq:
+    #   Shell.cd(path)
+    #
+    # Creates a new Shell instance with the current working directory
+    # set to +path+.
+    def cd(path)
+      new(path)
+    end
+
+    # Returns the directories in the current shell's PATH environment variable
+    # as an array of directory names. This sets the system_path for all
+    # instances of Shell.
+    #
+    # Example: If in your current shell, you did:
+    #
+    #   $ echo $PATH
+    #   /usr/bin:/bin:/usr/local/bin
+    #
+    # Running this method in the above shell would then return:
+    #
+    #   ["/usr/bin", "/bin", "/usr/local/bin"]
+    #
+    def default_system_path
+      if @default_system_path
+        @default_system_path
+      else
+        ENV["PATH"].split(":")
+      end
+    end
+
+    # Sets the system_path that new instances of Shell should have as their
+    # initial system_path.
+    #
+    # +path+ should be an array of directory name strings.
+    def default_system_path=(path)
+      @default_system_path = path
+    end
+
+    def default_record_separator
+      if @default_record_separator
+        @default_record_separator
+      else
+        $/
+      end
+    end
+
+    def default_record_separator=(rs)
+      @default_record_separator = rs
+    end
+
+    # os resource mutex
+    mutex_methods = ["unlock", "lock", "locked?", "synchronize", "try_lock", "exclusive_unlock"]
+    for m in mutex_methods
+      def_delegator("@debug_output_mutex", m, "debug_output_"+m.to_s)
+    end
+
+  end
+
+  # call-seq:
+  #   Shell.new(pwd, umask) -> obj
+  #
+  # Creates a Shell object which current directory is set to the process
+  # current directory, unless otherwise specified by the +pwd+ argument.
+  def initialize(pwd = Dir.pwd, umask = nil)
+    @cwd = File.expand_path(pwd)
+    @dir_stack = []
+    @umask = umask
+
+    @system_path = Shell.default_system_path
+    @record_separator = Shell.default_record_separator
+
+    @command_processor = CommandProcessor.new(self)
+    @process_controller = ProcessController.new(self)
+
+    @verbose = Shell.verbose
+    @debug = Shell.debug
+  end
+
+  # Returns the command search path in an array
+  attr_reader :system_path
+
+  # Sets the system path (the Shell instance's PATH environment variable).
+  #
+  # +path+ should be an array of directory name strings.
+  def system_path=(path)
+    @system_path = path
+    rehash
+  end
+
+
+  # Returns the umask
+  attr_accessor :umask
+  attr_accessor :record_separator
+  attr_accessor :verbose, :debug
+
+  def debug=(val)
+    @debug = val
+    @verbose = val if val
+  end
+
+  alias verbose? verbose
+  alias debug? debug
+
+  attr_reader :command_processor
+  attr_reader :process_controller
+
+  def expand_path(path)
+    File.expand_path(path, @cwd)
+  end
+
+  # Most Shell commands are defined via CommandProcessor
+
+  #
+  # Dir related methods
+  #
+  # Shell#cwd/dir/getwd/pwd
+  # Shell#chdir/cd
+  # Shell#pushdir/pushd
+  # Shell#popdir/popd
+  # Shell#mkdir
+  # Shell#rmdir
+
+  # Returns the current working directory.
+  attr_reader :cwd
+  alias dir cwd
+  alias getwd cwd
+  alias pwd cwd
+
+  attr_reader :dir_stack
+  alias dirs dir_stack
+
+  # call-seq:
+  #   Shell.chdir(path)
+  #
+  # Creates a Shell object which current directory is set to +path+.
+  #
+  # If a block is given, it restores the current directory when the block ends.
+  #
+  # If called as iterator, it restores the current directory when the
+  # block ends.
+  def chdir(path = nil, verbose = @verbose)
+    check_point
+
+    if iterator?
+      notify("chdir(with block) #{path}") if verbose
+      cwd_old = @cwd
+      begin
+        chdir(path, nil)
+        yield
+      ensure
+        chdir(cwd_old, nil)
+      end
+    else
+      notify("chdir #{path}") if verbose
+      path = "~" unless path
+      @cwd = expand_path(path)
+      notify "current dir: #{@cwd}"
+      rehash
+      Void.new(self)
+    end
+  end
+  alias cd chdir
+
+  # call-seq:
+  #   pushdir(path)
+  #   pushdir(path) { &block }
+  #
+  # Pushes the current directory to the directory stack, changing the current
+  # directory to +path+.
+  #
+  # If +path+ is omitted, it exchanges its current directory and the top of its
+  # directory stack.
+  #
+  # If a block is given, it restores the current directory when the block ends.
+  def pushdir(path = nil, verbose = @verbose)
+    check_point
+
+    if iterator?
+      notify("pushdir(with block) #{path}") if verbose
+      pushdir(path, nil)
+      begin
+        yield
+      ensure
+        popdir
+      end
+    elsif path
+      notify("pushdir #{path}") if verbose
+      @dir_stack.push @cwd
+      chdir(path, nil)
+      notify "dir stack: [#{@dir_stack.join ', '}]"
+      self
+    else
+      notify("pushdir") if verbose
+      if pop = @dir_stack.pop
+        @dir_stack.push @cwd
+        chdir pop
+        notify "dir stack: [#{@dir_stack.join ', '}]"
+        self
+      else
+        Shell.Fail DirStackEmpty
+      end
+    end
+    Void.new(self)
+  end
+  alias pushd pushdir
+
+  # Pops a directory from the directory stack, and sets the current directory
+  # to it.
+  def popdir
+    check_point
+
+    notify("popdir")
+    if pop = @dir_stack.pop
+      chdir pop
+      notify "dir stack: [#{@dir_stack.join ', '}]"
+      self
+    else
+      Shell.Fail DirStackEmpty
+    end
+    Void.new(self)
+  end
+  alias popd popdir
+
+  # Returns a list of scheduled jobs.
+  def jobs
+    @process_controller.jobs
+  end
+
+  # call-seq:
+  #   kill(signal, job)
+  #
+  # Sends the given +signal+ to the given +job+
+  def kill(sig, command)
+    @process_controller.kill_job(sig, command)
+  end
+
+  # call-seq:
+  #   def_system_command(command, path = command)
+  #
+  # Convenience method for Shell::CommandProcessor.def_system_command.
+  # Defines an instance method which will execute the given shell command.
+  # If the executable is not in Shell.default_system_path, you must
+  # supply the path to it.
+  #
+  #    Shell.def_system_command('hostname')
+  #    Shell.new.hostname # => localhost
+  #
+  #    # How to use an executable that's not in the default path
+  #
+  #    Shell.def_system_command('run_my_program', "~/hello")
+  #    Shell.new.run_my_program # prints "Hello from a C program!"
+  #
+  def Shell.def_system_command(command, path = command)
+    CommandProcessor.def_system_command(command, path)
+  end
+
+  # Convenience method for Shell::CommandProcessor.undef_system_command
+  def Shell.undef_system_command(command)
+    CommandProcessor.undef_system_command(command)
+  end
+
+  # call-seq:
+  #   alias_command(alias, command, *opts, &block)
+  #
+  # Convenience method for Shell::CommandProcessor.alias_command.
+  # Defines an instance method which will execute a command under
+  # an alternative name.
+  #
+  #    Shell.def_system_command('date')
+  #    Shell.alias_command('date_in_utc', 'date', '-u')
+  #    Shell.new.date_in_utc # => Sat Jan 25 16:59:57 UTC 2014
+  #
+  def Shell.alias_command(ali, command, *opts, &block)
+    CommandProcessor.alias_command(ali, command, *opts, &block)
+  end
+
+  # Convenience method for Shell::CommandProcessor.unalias_command
+  def Shell.unalias_command(ali)
+    CommandProcessor.unalias_command(ali)
+  end
+
+  # call-seq:
+  #   install_system_commands(pre = "sys_")
+  #
+  # Convenience method for Shell::CommandProcessor.install_system_commands.
+  # Defines instance methods representing all the executable files found in
+  # Shell.default_system_path, with the given prefix prepended to their
+  # names.
+  #
+  #    Shell.install_system_commands
+  #    Shell.new.sys_echo("hello") # => hello
+  #
+  def Shell.install_system_commands(pre = "sys_")
+    CommandProcessor.install_system_commands(pre)
+  end
+
+  #
+  def inspect
+    if debug.kind_of?(Integer) && debug > 2
+      super
+    else
+      to_s
+    end
+  end
+
+  def self.notify(*opts)
+    Shell::debug_output_synchronize do
+      if opts[-1].kind_of?(String)
+        yorn = verbose?
+      else
+        yorn = opts.pop
+      end
+      return unless yorn
+
+      if @debug_display_thread_id
+        if @debug_display_process_id
+          prefix = "shell(##{Process.pid}:#{Thread.current.to_s.sub("Thread", "Th")}): "
+        else
+          prefix = "shell(#{Thread.current.to_s.sub("Thread", "Th")}): "
+        end
+      else
+        prefix = "shell: "
+      end
+      _head = true
+      STDERR.print opts.collect{|mes|
+        mes = mes.dup
+        yield mes if iterator?
+        if _head
+          _head = false
+          prefix + mes
+        else
+          " "* prefix.size + mes
+        end
+      }.join("\n")+"\n"
+    end
+  end
+
+  CommandProcessor.initialize
+  CommandProcessor.run_config
+end