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Class: Shell::Filter

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Subclasses:
AppendFile, AppendIO, BuiltInCommand, Cat, Concat, Echo, Glob, SystemCommand, Tee, Void
Super Chains via Extension / Inclusion / Inheritance
Instance Chain:
self, Enumerable
Inherits: Object
Defined in: lib/shell/filter.rb

Overview

Any result of command execution is a Filter.

This class includes Enumerable, therefore a Filter object can use all Enumerable facilities.

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(sh) ⇒ Filter

[ GitHub ] 

  


# File 'lib/shell/filter.rb', line 23



def initialize(sh)
  @shell = sh         # parent shell
  @input = nil        # input filter
end


  







Instance Attribute Details



  

    #input   (rw)
  

  [ GitHub ]


  

  


# File 'lib/shell/filter.rb', line 28



attr_reader :input


  








  

    #input=(filter)   (rw)
  

  [ GitHub ]


  

  


# File 'lib/shell/filter.rb', line 30



def input=(filter)
  @input = filter
end


  







Instance Method Details



  

    #+(filter2)    



  

    

Outputs filter1, and then filter2 using Join.new


  



  [ GitHub ]


  

  


# File 'lib/shell/filter.rb', line 114



def +(filter)
  Join.new(@shell, self, filter)
end


  








  

    #<(source)    



  

    

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


  



  [ GitHub ]


  

  


# File 'lib/shell/filter.rb', line 50



def <(src)
  case src
  when String
    cat = Cat.new(@shell, src)
    cat | self
  when IO
    self.input = src
    self
  else
    Shell.Fail Error::CantApplyMethod, "<", src.class
  end
end


  








  

    #>(source)    



  

    

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


  



  [ GitHub ]


  

  


# File 'lib/shell/filter.rb', line 68



def >(to)
  case to
  when String
    dst = @shell.open(to, "w")
    begin
      each(){|l| dst << l}
    ensure
      dst.close
    end
  when IO
    each(){|l| to << l}
  else
    Shell.Fail Error::CantApplyMethod, ">", to.class
  end
  self
end


  








  

    #>>(source)    



  

    

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


  



  [ GitHub ]


  

  


# File 'lib/shell/filter.rb', line 90



def >>(to)
  begin
    Shell.cd(@shell.pwd).append(to, self)
  rescue CantApplyMethod
    Shell.Fail Error::CantApplyMethod, ">>", to.class
  end
end


  








  

    #each(record_separator = nil)      Also known as: #super_each
  



  

    

Iterates a block for each line.


  



  [ GitHub ]


  

  


# File 'lib/shell/filter.rb', line 38



def each(rs = nil)
  rs = @shell.record_separator unless rs
  if @input
    @input.each(rs){|l| yield l}
  end
end


  








  

    #inspect  
  

  [ GitHub ]


  

  


# File 'lib/shell/filter.rb', line 130



def inspect
  if @shell.debug.kind_of?(Integer) && @shell.debug > 2
    super
  else
    to_s
  end
end


  








  

    #to_a  
  

  [ GitHub ]


  

  


# File 'lib/shell/filter.rb', line 118



def to_a
  ary = []
  each(){|l| ary.push l}
  ary
end


  








  

    #to_s  
  

  [ GitHub ]


  

  


# File 'lib/shell/filter.rb', line 124



def to_s
  str = ""
  each(){|l| str.concat l}
  str
end


  








  

    #|(filter)    



  

    

Processes a pipeline.


  



  [ GitHub ]


  

  


# File 'lib/shell/filter.rb', line 102



def |(filter)
  filter.input = self
  if active?
    @shell.process_controller.start_job filter
  end
  filter
end