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Current File : /usr/lib/ruby/1.8/shell/command-processor.rb
#
#   shell/command-controller.rb - 
#   	$Release Version: 0.6.0 $
#   	$Revision: 22281 $
#   	$Date: 2009-02-13 19:05:02 +0900 (Fri, 13 Feb 2009) $
#   	by Keiju ISHITSUKA(Nippon Rational Inc.)
#
# --
#
#   
#

require "e2mmap"
require "ftools"
require "thread"

require "shell/error"
require "shell/filter"
require "shell/system-command"
require "shell/builtin-command"

class Shell
  class CommandProcessor
#    include Error

    #
    # initialize of Shell and related classes.
    #
    NoDelegateMethods = ["initialize", "expand_path"]
    def self.initialize

      install_builtin_commands

      # define CommandProccessor#methods to Shell#methods and Filter#methods
      for m in CommandProcessor.instance_methods(false) - NoDelegateMethods
	add_delegate_command_to_shell(m)
      end
      
      def self.method_added(id)
	add_delegate_command_to_shell(id)
      end
    end

    #
    # include run file.
    #
    def self.run_config
      begin
	load File.expand_path("~/.rb_shell") if ENV.key?("HOME")
      rescue LoadError, Errno::ENOENT
      rescue
	print "load error: #{rc}\n"
	print $!.class, ": ", $!, "\n"
	for err in $@[0, $@.size - 2]
	  print "\t", err, "\n"
	end
      end
    end

    def initialize(shell)
      @shell = shell
      @system_commands = {}
    end

    #
    # CommandProcessor#expand_path(path)
    #	  path:	  String
    #	  return: String
    #	returns the absolute path for <path>
    #
    def expand_path(path)
      @shell.expand_path(path)
    end

    #
    # File related commands
    # Shell#foreach
    # Shell#open
    # Shell#unlink
    # Shell#test
    #
    # -
    #	
    # CommandProcessor#foreach(path, rs)
    #	  path: String
    #	  rs:	String - record separator
    #	  iterator
    #	Same as:
    #	  File#foreach (when path is file)
    #	  Dir#foreach (when path is directory)
    #	path is relative to pwd
    #
    def foreach(path = nil, *rs)
      path = "." unless path
      path = expand_path(path)

      if File.directory?(path)
	Dir.foreach(path){|fn| yield fn}
      else
	IO.foreach(path, *rs){|l| yield l}
      end
    end

    #
    # CommandProcessor#open(path, mode)
    #	  path:	  String
    #	  mode:	  String
    #	  return: File or Dir
    #	Same as:
    #	  File#open (when path is file)
    #	  Dir#open  (when path is directory)
    #	mode has an effect only when path is a file
    #
    def open(path, mode)
      path = expand_path(path)
      if File.directory?(path)
	Dir.open(path)
      else
	effect_umask do
	  File.open(path, mode)
	end
      end
    end
    #  public :open

    #
    # CommandProcessor#unlink(path)
    #	same as:
    #	  Dir#unlink  (when path is directory)
    #	  File#unlink (when path is file)
    #
    def unlink(path)
      path = expand_path(path)
      if File.directory?(path)
	Dir.unlink(path)
      else
	IO.unlink(path)
      end
    end

    #
    # CommandProcessor#test(command, file1, file2)
    # CommandProcessor#[command, file1, file2]
    #	  command: char or String or Symbol
    #	  file1:   String
    #	  file2:   String(optional)
    #	  return: Boolean
    #	same as:
    #	  test()	   (when command is char or length 1 string or symbol)
    #	  FileTest.command (others)
    #	example:
    #	  sh[?e, "foo"]
    #	  sh[:e, "foo"]
    #	  sh["e", "foo"]
    #	  sh[:exists?, "foo"]
    #	  sh["exists?", "foo"]
    #	  
    alias top_level_test test
    def test(command, file1, file2=nil)
      file1 = expand_path(file1)
      file2 = expand_path(file2) if file2
      command = command.id2name if command.kind_of?(Symbol)

      case command
      when Integer
	if file2
	  top_level_test(command, file1, file2)
	else
	  top_level_test(command, file1)
	end
      when String
	if command.size == 1
	  if file2
	    top_level_test(command, file1, file2)
	  else
	    top_level_test(command, file1)
	  end
	else
	  if file2
	    FileTest.send(command, file1, file2)
	  else
	    FileTest.send(command, file1)
	  end
	end
      end
    end
    alias [] test

    #
    # Dir related methods
    #
    # Shell#mkdir
    # Shell#rmdir
    #
    #--
    #
    # CommandProcessor#mkdir(*path)
    #	  path: String
    #	same as Dir.mkdir()
    #	  
    def mkdir(*path)
      for dir in path
	Dir.mkdir(expand_path(dir))
      end
    end

    #
    # CommandProcessor#rmdir(*path)
    #	  path: String
    #	same as Dir.rmdir()
    #	  
    def rmdir(*path)
      for dir in path
	Dir.rmdir(expand_path(dir))
      end
    end

    #
    # CommandProcessor#system(command, *opts)
    #	  command: String
    #	  opts:	   String
    #	  return:  SystemCommand
    #	Same as system() function
    #	example:
    #	  print sh.system("ls", "-l")
    #	  sh.system("ls", "-l") | sh.head > STDOUT
    # 
    def system(command, *opts)
      if opts.empty?
	if command =~ /\*|\?|\{|\}|\[|\]|<|>|\(|\)|~|&|\||\\|\$|;|'|`|"|\n/
	  return SystemCommand.new(@shell, find_system_command("sh"), "-c", command)
	else
	  command, *opts = command.split(/\s+/)
	end
      end
      SystemCommand.new(@shell, find_system_command(command), *opts)
    end

    #
    # ProcessCommand#rehash
    #	clear command hash table.
    #
    def rehash
      @system_commands = {}
    end

    #
    # ProcessCommand#transact
    #
    def check_point
      @shell.process_controller.wait_all_jobs_execution
    end
    alias finish_all_jobs check_point

    def transact(&block)
      begin
	@shell.instance_eval(&block)
      ensure
	check_point
      end
    end

    #
    # internal commands
    #
    def out(dev = STDOUT, &block)
      dev.print transact(&block)
    end

    def echo(*strings)
      Echo.new(@shell, *strings)
    end

    def cat(*filenames)
      Cat.new(@shell, *filenames)
    end

    #   def sort(*filenames)
    #     Sort.new(self, *filenames)
    #   end

    def glob(pattern)
      Glob.new(@shell, pattern)
    end

    def append(to, filter)
      case to
      when String
	AppendFile.new(@shell, to, filter)
      when IO
	AppendIO.new(@shell, to, filter)
      else
	Shell.Fail Error::CantApplyMethod, "append", to.class
      end
    end

    def tee(file)
      Tee.new(@shell, file)
    end

    def concat(*jobs)
      Concat.new(@shell, *jobs)
    end

    # %pwd, %cwd -> @pwd
    def notify(*opts, &block)
      Thread.exclusive do
	Shell.notify(*opts) {|mes|
	  yield mes if iterator?
	
	  mes.gsub!("%pwd", "#{@cwd}")
	  mes.gsub!("%cwd", "#{@cwd}")
	}
      end
    end

    #
    # private functions
    #
    def effect_umask
      if @shell.umask
	Thread.critical = true
	save = File.umask
	begin
	  yield
	ensure
	  File.umask save
	  Thread.critical = false
	end
      else
	yield
      end
    end
    private :effect_umask

    def find_system_command(command)
      return command if /^\// =~ command
      case path = @system_commands[command]
      when String
	if exists?(path)
	  return path
	else
	  Shell.Fail Error::CommandNotFound, command
	end
      when false
	Shell.Fail Error::CommandNotFound, command
      end

      for p in @shell.system_path
	path = join(p, command)
	if FileTest.exists?(path)
	  @system_commands[command] = path
	  return path
	end
      end
      @system_commands[command] = false
      Shell.Fail Error::CommandNotFound, command
    end

    #
    # CommandProcessor.def_system_command(command, path)
    #	  command:  String
    #	  path:	    String
    #	define 'command()' method as method.
    #
    def self.def_system_command(command, path = command)
      begin
	eval((d = %Q[def #{command}(*opts)
     	          SystemCommand.new(@shell, '#{path}', *opts)
               end]), nil, __FILE__, __LINE__ - 1)
      rescue SyntaxError
	Shell.notify "warn: Can't define #{command} path: #{path}." 
      end
      Shell.notify "Define #{command} path: #{path}.", Shell.debug?
      Shell.notify("Definition of #{command}: ", d, 
	     Shell.debug.kind_of?(Integer) && Shell.debug > 1)
    end

    def self.undef_system_command(command)
      command = command.id2name if command.kind_of?(Symbol)
      remove_method(command)
      Shell.module_eval{remove_method(command)}
      Filter.module_eval{remove_method(command)}
      self
    end

    # define command alias
    # ex)
    # def_alias_command("ls_c", "ls", "-C", "-F")
    # def_alias_command("ls_c", "ls"){|*opts| ["-C", "-F", *opts]}
    #
    @alias_map = {}
    def self.alias_map
      @alias_map
    end
    def self.alias_command(ali, command, *opts, &block)
      ali = ali.id2name if ali.kind_of?(Symbol)
      command = command.id2name if command.kind_of?(Symbol)
      begin
	if iterator?
	  @alias_map[ali.intern] = proc

	  eval((d = %Q[def #{ali}(*opts)
                          @shell.__send__(:#{command},
                                          *(CommandProcessor.alias_map[:#{ali}].call *opts))
	                end]), nil, __FILE__, __LINE__ - 1)
    
	else
           args = opts.collect{|opt| '"' + opt + '"'}.join(",")
           eval((d = %Q[def #{ali}(*opts)
                          @shell.__send__(:#{command}, #{args}, *opts)
                        end]), nil, __FILE__, __LINE__ - 1)
	end
      rescue SyntaxError
	Shell.notify "warn: Can't alias #{ali} command: #{command}." 
	Shell.notify("Definition of #{ali}: ", d)
	raise
      end
      Shell.notify "Define #{ali} command: #{command}.", Shell.debug?
      Shell.notify("Definition of #{ali}: ", d, 
	     Shell.debug.kind_of?(Integer) && Shell.debug > 1)
      self
    end
   
    def self.unalias_command(ali)
      ali = ali.id2name if ali.kind_of?(Symbol)
      @alias_map.delete ali.intern
      undef_system_command(ali)
    end
   
    #
    # CommandProcessor.def_builtin_commands(delegation_class, command_specs)
    #	  delegation_class: Class or Module
    #	  command_specs: [[command_name, [argument,...]],...]
    #	     command_name: String
    #	     arguments:	   String
    #		FILENAME?? -> expand_path(filename??)
    #		*FILENAME?? -> filename??.collect{|f|expand_path(f)}.join(", ")
    #	define command_name(argument,...) as
    #	    delegation_class.command_name(argument,...)
    #
    def self.def_builtin_commands(delegation_class, command_specs)
      for meth, args in command_specs
	arg_str = args.collect{|arg| arg.downcase}.join(", ")
	call_arg_str = args.collect{
	  |arg|
	  case arg
	  when /^(FILENAME.*)$/
	    format("expand_path(%s)", $1.downcase)
	  when /^(\*FILENAME.*)$/
	    # \*FILENAME* -> filenames.collect{|fn| expand_path(fn)}.join(", ")
	    $1.downcase + '.collect{|fn| expand_path(fn)}'
	  else
	    arg
	  end
	}.join(", ")
	d = %Q[def #{meth}(#{arg_str})
		    #{delegation_class}.#{meth}(#{call_arg_str})
		 end]
	Shell.notify "Define #{meth}(#{arg_str})", Shell.debug?
	Shell.notify("Definition of #{meth}: ", d, 
	     Shell.debug.kind_of?(Integer) && Shell.debug > 1)
	eval d
      end
    end

    #
    # CommandProcessor.install_system_commands(pre)
    #	    pre: String - command name prefix
    # defines every command which belongs in default_system_path via
    # CommandProcessor.command().  It doesn't define already defined
    # methods twice.  By default, "pre_" is prefixes to each method
    # name.  Characters that may not be used in a method name are
    # all converted to '_'.  Definition errors are just ignored.
    #
    def self.install_system_commands(pre = "sys_")
      defined_meth = {}
      for m in Shell.methods
	defined_meth[m] = true
      end
      sh = Shell.new
      for path in Shell.default_system_path
	next unless sh.directory? path
	sh.cd path
	sh.foreach do
	  |cn|
	  if !defined_meth[pre + cn] && sh.file?(cn) && sh.executable?(cn)
	    command = (pre + cn).gsub(/\W/, "_").sub(/^([0-9])/, '_\1')
	    begin
	      def_system_command(command, sh.expand_path(cn))
	    rescue
	      Shell.notify "warn: Can't define #{command} path: #{cn}"
	    end
	    defined_meth[command] = command
	  end
	end
      end
    end

    #----------------------------------------------------------------------
    #
    #  class initializing methods  - 
    #
    #----------------------------------------------------------------------
    def self.add_delegate_command_to_shell(id)
      id = id.intern if id.kind_of?(String)
      name = id.id2name
      if Shell.method_defined?(id)
	Shell.notify "warn: override definnition of Shell##{name}."
	Shell.notify "warn: alias Shell##{name} to Shell##{name}_org.\n"
	Shell.module_eval "alias #{name}_org #{name}"
      end
      Shell.notify "method added: Shell##{name}.", Shell.debug?
      Shell.module_eval(%Q[def #{name}(*args, &block)
			    begin
			      @command_processor.__send__(:#{name}, *args, &block)
			    rescue Exception
			      $@.delete_if{|s| /:in `__getobj__'$/ =~ s} #`
	                      $@.delete_if{|s| /^\\(eval\\):/ =~ s}
			    raise
			    end
                          end], __FILE__, __LINE__)

      if Shell::Filter.method_defined?(id)
	Shell.notify "warn: override definnition of Shell::Filter##{name}."
	Shell.notify "warn: alias Shell##{name} to Shell::Filter##{name}_org."
	Filter.module_eval "alias #{name}_org #{name}"
      end
      Shell.notify "method added: Shell::Filter##{name}.", Shell.debug?
      Filter.module_eval(%Q[def #{name}(*args, &block)
			    begin
			      self | @shell.__send__(:#{name}, *args, &block)
			    rescue Exception
			      $@.delete_if{|s| /:in `__getobj__'$/ =~ s} #`
	                      $@.delete_if{|s| /^\\(eval\\):/ =~ s}
			    raise
			    end
                          end], __FILE__, __LINE__)
    end

    #
    # define default builtin commands
    #
    def self.install_builtin_commands
      # method related File.
      #	(exclude open/foreach/unlink)
      normal_delegation_file_methods = [
	["atime", ["FILENAME"]],
	["basename", ["fn", "*opts"]],
	["chmod", ["mode", "*FILENAMES"]], 
	["chown", ["owner", "group", "*FILENAME"]],
	["ctime", ["FILENAMES"]],
	["delete", ["*FILENAMES"]],
	["dirname", ["FILENAME"]],
	["ftype", ["FILENAME"]],
	["join", ["*items"]],
	["link", ["FILENAME_O", "FILENAME_N"]],
	["lstat", ["FILENAME"]],
	["mtime", ["FILENAME"]],
	["readlink", ["FILENAME"]],
	["rename", ["FILENAME_FROM", "FILENAME_TO"]],
	#      ["size", ["FILENAME"]],
	["split", ["pathname"]],
	["stat", ["FILENAME"]],
	["symlink", ["FILENAME_O", "FILENAME_N"]],
	["truncate", ["FILENAME", "length"]],
	["utime", ["atime", "mtime", "*FILENAMES"]]]

      def_builtin_commands(File, normal_delegation_file_methods)
      alias_method :rm, :delete

      # method related FileTest
      def_builtin_commands(FileTest, 
		   FileTest.singleton_methods(false).collect{|m| [m, ["FILENAME"]]})

      # method related ftools
      normal_delegation_ftools_methods = [
	["syscopy", ["FILENAME_FROM", "FILENAME_TO"]],
	["copy", ["FILENAME_FROM", "FILENAME_TO"]],
	["move", ["FILENAME_FROM", "FILENAME_TO"]],
	["compare", ["FILENAME_FROM", "FILENAME_TO"]],
	["safe_unlink", ["*FILENAMES"]],
	["makedirs", ["*FILENAMES"]],
	#    ["chmod", ["mode", "*FILENAMES"]],
	["install", ["FILENAME_FROM", "FILENAME_TO", "mode"]],
      ]
      def_builtin_commands(File,
		   normal_delegation_ftools_methods)
      alias_method :cmp, :compare
      alias_method :mv, :move
      alias_method :cp, :copy
      alias_method :rm_f, :safe_unlink
      alias_method :mkpath, :makedirs
    end

  end
end

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