Class: TTY::Terminal::SystemPager

Inherits:
Pager
  • Object
show all
Defined in:
lib/tty/terminal/pager/system.rb

Overview

A class responsible for paging text

Instance Attribute Summary

Attributes inherited from Pager

#enabled, #text

Instance Method Summary collapse

Methods inherited from Pager

available, available?, command, #enabled?, executables, #initialize, page

Constructor Details

This class inherits a constructor from TTY::Terminal::Pager

Instance Method Details

#page ⇒ Object

Use system command to page output text



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# File 'lib/tty/terminal/pager/system.rb', line 12

def page
  read_io, write_io = IO.pipe

  if Kernel.fork
    # parent process
    TTY.shell.input.reopen(read_io)
    read_io.close
    write_io.close

    # Wait until we have input before we start the pager
    Kernel.select [TTY.shell.stdin]

    begin
      Kernel.exec(Pager.command)
    rescue
      Kernel.exec "/bin/sh", "-c", command
    end
  else
    # child process
    write_io.write(text)
    write_io.close
    read_io.close
  end
end