Shell::Filter

Any result of command execution is a Filter.

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

Attributes

input

Read

No documentation available

Class Methods

new(sh)

2.4 View on GitHub

          # File tmp/rubies/ruby-2.4.10/lib/shell/filter.rb, line 23
def initialize(sh)
  @shell = sh         # parent shell
  @input = nil        # input filter
end

No documentation available

Instance Methods

< source

2.4 View on GitHub

          # File tmp/rubies/ruby-2.4.10/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, "<", to.class
  end
end

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

> source

2.4 View on GitHub

          # File tmp/rubies/ruby-2.4.10/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

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

>> source

2.4 View on GitHub

          # File tmp/rubies/ruby-2.4.10/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

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

| filter

2.4 View on GitHub

          # File tmp/rubies/ruby-2.4.10/lib/shell/filter.rb, line 102
def |(filter)
  filter.input = self
  if active?
    @shell.process_controller.start_job filter
  end
  filter
end

Processes a pipeline.

filter1 + filter2

2.4 View on GitHub

          # File tmp/rubies/ruby-2.4.10/lib/shell/filter.rb, line 114
def +(filter)
  Join.new(@shell, self, filter)
end

Outputs filter1, and then filter2 using Join.new

each(record_separator=nil) { block }

2.4 View on GitHub

          # File tmp/rubies/ruby-2.4.10/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

Iterates a block for each line.

input=(filter)

2.4 View on GitHub

          # File tmp/rubies/ruby-2.4.10/lib/shell/filter.rb, line 30
def input=(filter)
  @input = filter
end

No documentation available

inspect

2.4 View on GitHub

          # File tmp/rubies/ruby-2.4.10/lib/shell/filter.rb, line 130
def inspect
  if @shell.debug.kind_of?(Integer) && @shell.debug > 2
    super
  else
    to_s
  end
end

No documentation available

to_a

2.4 View on GitHub

          # File tmp/rubies/ruby-2.4.10/lib/shell/filter.rb, line 118
def to_a
  ary = []
  each(){|l| ary.push l}
  ary
end

No documentation available

to_s

2.4 View on GitHub

          # File tmp/rubies/ruby-2.4.10/lib/shell/filter.rb, line 124
def to_s
  str = ""
  each(){|l| str.concat l}
  str
end

No documentation available