Class: SimpleShell::Command

Inherits:
Object
  • Object
show all
Defined in:
lib/simple_shell.rb

Overview

A command and it’s output

stdout and stderr are

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(shell) ⇒ Command

Returns a new instance of Command.



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# File 'lib/simple_shell.rb', line 128

def initialize(shell)
  @shell = shell
  @base  = shell.base
  @env   = shell.env || {}

  @out = ""
  @err = ""
  @S   = -1
end

Instance Attribute Details

#err ⇒ Object (readonly)

Returns the value of attribute err.



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# File 'lib/simple_shell.rb', line 126

def err
  @err
end

#out ⇒ Object (readonly)

Returns the value of attribute out.



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# File 'lib/simple_shell.rb', line 126

def out
  @out
end

#S ⇒ Object (readonly)

Returns the value of attribute S.



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# File 'lib/simple_shell.rb', line 126

def S
  @S
end

Instance Method Details

#execute(command, *args, &block) ⇒ Object 



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# File 'lib/simple_shell.rb', line 138

def execute(command, *args, &block)
  $stderr.puts("#{@env} #{command}, #{args}, #{@base}") if SimpleShell.noisy

  Open3.popen3(@env, "#{command}", *(args.collect { |a| "#{a}" }) , :chdir => @base) do |stdin, stdout, stderr, thread|

    threads = []
    if @shell.stdout_handler
      threads << Thread.new(@shell.stdout_handler, stdout) do |handler, io|
        while(line = io.gets)
          handler.call(line)
        end
      end
    end

    if @shell.stderr_handler
      threads << Thread.new(@shell.stderr_handler, stderr) do |handler, io|
        while(line = io.gets)
          handler.call(line)
        end
      end
    end

    if block_given?
      yield stdin
    end

    stdin.close

    threads.collect(&:join)

    @out = @shell.stdout_handler ? nil : stdout.read.chomp
    @err = @shell.stderr_handler ? nil : stderr.read.chomp
    @S   = thread.value rescue 0
  end
end

#S? ⇒ Boolean

cheap copy of $?

Returns:

  • (Boolean) 


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# File 'lib/simple_shell.rb', line 175

def S?
  @S
end

#to_s ⇒ Object

we just want to know the output of the command



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# File 'lib/simple_shell.rb', line 180

def to_s
  @out
end