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Class: Shell::SystemCommand

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, Filter
Instance Chain:
self, Filter, Enumerable
Inherits: Shell::Filter
Defined in: lib/shell/system-command.rb

Class Method Summary

Filter - Inherited

.new

Instance Attribute Summary

Filter - Inherited

#input, #input=

Instance Method Summary

Filter - Inherited

#+

Outputs filter1, and then filter2 using Join.new
#<

Inputs from source, which is either a string of a file name or an IO object.
#>

Outputs from source, which is either a string of a file name or an IO object.
#>>

Appends the output to source, which is either a string of a file name or an IO object.
#each

Iterates a block for each line.
#inspect, #to_a, #to_s,
#|

Processes a pipeline.

Constructor Details

.new(sh, command, *opts) ⇒ SystemCommand

[ GitHub ] 

  


# File 'lib/shell/system-command.rb', line 17



def initialize(sh, command, *opts)
  if t = opts.find{|opt| !opt.kind_of?(String) && opt.class}
    Shell.Fail Error::TypeError, t.class, "String"
  end
  super(sh)
  @command = command
  @opts = opts

  @input_queue = Queue.new
  @pid = nil

  sh.process_controller.add_schedule(self)
end


  







Instance Attribute Details



  

    #active?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/shell/system-command.rb', line 38



def active?
  @shell.process_controller.active_job?(self)
end


  








  

    #command   (readonly)
    Also known as: #name
  

  [ GitHub ]


  

  


# File 'lib/shell/system-command.rb', line 31



attr_reader :command


  








  

    #input=(inp)   (writeonly)
  

  [ GitHub ]


  

  


# File 'lib/shell/system-command.rb', line 42



def input=(inp)
  super
  if active?
    start_export
  end
end


  








  

    #name   (readonly)
  



  

    

Alias for #command.


  



  [ GitHub ]


  

  


# File 'lib/shell/system-command.rb', line 32



alias name command


  








  

    #wait?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/shell/system-command.rb', line 34



def wait?
  @shell.process_controller.waiting_job?(self)
end


  







Instance Method Details



  

    #each(rs = nil)  
  

  [ GitHub ]


  

  


# File 'lib/shell/system-command.rb', line 136



def each(rs = nil)
  while (l = @input_queue.pop) != :EOF
    yield l
  end
end


  








  

    #flush  
  

  [ GitHub ]


  

  


# File 'lib/shell/system-command.rb', line 63



def flush
  @pipe_out.flush if @pipe_out and !@pipe_out.closed?
end


  








  

    #kill(sig)  
  

  [ GitHub ]


  

  


# File 'lib/shell/system-command.rb', line 78



def kill(sig)
  if @pid
    Process.kill(sig, @pid)
  end
end


  








  

    #notify(*opts)  
  



  

    

ex)



if you wish to output:
   "shell: job(#{@command}:#{@pid}) close pipe-out."
then
   mes: "job(%id) close pipe-out."
yorn: Boolean(@shell.debug? or @shell.verbose?)


  



  [ GitHub ]


  

  


# File 'lib/shell/system-command.rb', line 148



def notify(*opts)
  @shell.notify(*opts) do |mes|
    yield mes if iterator?

    mes.gsub!("%id", "#{@command}:##{@pid}")
    mes.gsub!("%name", "#{@command}")
    mes.gsub!("%pid", "#{@pid}")
    mes
  end
end


  








  

    #start  
  

  [ GitHub ]


  

  


# File 'lib/shell/system-command.rb', line 49



def start
  notify([@command, *@opts].join(" "))

  @pid, @pipe_in, @pipe_out = @shell.process_controller.sfork(self) {
    Dir.chdir @shell.pwd
    $0 = @command
    exec(@command, *@opts)
  }
  if @input
    start_export
  end
  start_import
end


  








  

    #start_export  
  

  [ GitHub ]


  

  


# File 'lib/shell/system-command.rb', line 109



def start_export
  notify "job(%id) start exp-pipe.", @shell.debug?
  _eop = true
  Thread.start{
    begin
      @input.each do |l|
        ProcessController::block_output_synchronize do
          @pipe_out.print l
        end
      end
      _eop = false
    rescue Errno::EPIPE, Errno::EIO
      _eop = false
    ensure
      if !ProcessController::USING_AT_EXIT_WHEN_PROCESS_EXIT and _eop
        notify("shell: warn: Process finishing...",
               "wait for Job(%id) to finish pipe exporting.",
               "You can use Shell#transact or Shell#check_point for more safe execution.")
        redo
      end
      notify "job(%id) close exp-pipe.", @shell.debug?
      @pipe_out.close
    end
  }
end


  








  

    #start_import  
  

  [ GitHub ]


  

  


# File 'lib/shell/system-command.rb', line 84



def start_import
  notify "Job(%id) start imp-pipe.", @shell.debug?
  _eop = true
  Thread.start {
    begin
      while l = @pipe_in.gets
        @input_queue.push l
      end
      _eop = false
    rescue Errno::EPIPE
      _eop = false
    ensure
      if !ProcessController::USING_AT_EXIT_WHEN_PROCESS_EXIT and _eop
        notify("warn: Process finishing...",
               "wait for Job[%id] to finish pipe importing.",
               "You can use Shell#transact or Shell#check_point for more safe execution.")
        redo
      end
      notify "job(%id}) close imp-pipe.", @shell.debug?
      @input_queue.push :EOF
      @pipe_in.close
    end
  }
end


  








  

    #super_each(rs = nil)  
  



  

    

Alias for Filter#each.


  



  [ GitHub ]


  

  


# File 'lib/shell/system-command.rb', line 135



alias super_each each


  








  

    #terminate  
  

  [ GitHub ]


  

  


# File 'lib/shell/system-command.rb', line 67



def terminate
  begin
    @pipe_in.close
  rescue IOError
  end
  begin
    @pipe_out.close
  rescue IOError
  end
end