Class Shell::Filter < Object

# File ../ruby/lib/shell/filter.rb, line 21
def initialize(sh)
  @shell = sh         # parent shell
  @input = nil        # input filter
end

# File ../ruby/lib/shell/filter.rb, line 85
def + (filter)
  Join.new(@shell, self, filter)
end

# File ../ruby/lib/shell/filter.rb, line 39
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

# File ../ruby/lib/shell/filter.rb, line 52
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

# File ../ruby/lib/shell/filter.rb, line 69
def >> (to)
  begin
    Shell.cd(@shell.pwd).append(to, self)
  rescue CantApplyMethod
    Shell.Fail Error::CantApplyMethod, ">>", to.class
  end
end

# File ../ruby/lib/shell/filter.rb, line 32
def each(rs = nil)
  rs = @shell.record_separator unless rs
  if @input
    @input.each(rs){|l| yield l}
  end
end

# File ../ruby/lib/shell/filter.rb, line 28
def input=(filter)
  @input = filter
end

# File ../ruby/lib/shell/filter.rb, line 101
def inspect
  if @shell.debug.kind_of?(Integer) && @shell.debug > 2
    super
  else
    to_s
  end
end

# File ../ruby/lib/shell/filter.rb, line 89
def to_a
  ary = []
  each(){|l| ary.push l}
  ary
end

# File ../ruby/lib/shell/filter.rb, line 95
def to_s
  str = ""
  each(){|l| str.concat l}
  str
end

# File ../ruby/lib/shell/filter.rb, line 77
def | (filter)
  filter.input = self
  if active?
    @shell.process_controller.start_job filter
  end
  filter
end