Class: Halfshell::Terminal

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

Constant Summary collapse

TIMEOUT = 
60 * 60
WAIT_INTERVAL = 
1.0/1000
OPEN4_RETURNS = 
[:pid, :stdin, :stdout, :stderr]

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(stdin:, stdout:, stderr:, pid:) ⇒ Terminal

Returns a new instance of Terminal.



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# File 'lib/halfshell/terminal.rb', line 23

def initialize(stdin:, stdout:, stderr:, pid:)
  @stdin, @stdout, @stderr, @pid = stdin, stdout, stderr, pid

  @tries = 0
  @max_tries = (TIMEOUT / WAIT_INTERVAL).to_i
end

Class Method Details

.default ⇒ Object 



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# File 'lib/halfshell/terminal.rb', line 9

def Terminal.default
  Terminal.sh
end

.sh ⇒ Object 



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# File 'lib/halfshell/terminal.rb', line 19

def Terminal.sh
  Terminal.new(**OPEN4_RETURNS.zip(Open4::popen4("sh 2>&1")).to_h)
end

.zsh ⇒ Object 



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# File 'lib/halfshell/terminal.rb', line 13

def Terminal.zsh
  Terminal.new(**OPEN4_RETURNS.zip(Open4::popen4("zsh 2>&1")).to_h)
end

Instance Method Details

#gets ⇒ Object 



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# File 'lib/halfshell/terminal.rb', line 34

def gets
  read_nonblock_loop(@stdout)
end

#gets_err ⇒ Object 



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# File 'lib/halfshell/terminal.rb', line 38

def gets_err
  read_nonblock_loop(@stderr)
end

#puts(what) ⇒ Object 



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# File 'lib/halfshell/terminal.rb', line 30

def puts(what)
  @stdin.puts what
end

#raise_error ⇒ Object

Raises:



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# File 'lib/halfshell/terminal.rb', line 65

def raise_error
  binding.pry if $testing
  raise Error
end

#read_nonblock_loop(io) ⇒ Object 



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# File 'lib/halfshell/terminal.rb', line 42

def read_nonblock_loop(io)
  got = ""
  loop do
    begin
      @tries += 1
      got << io.read_nonblock(1)
    rescue IO::EAGAINWaitReadable
      raise_error if too_many_tries?
      if got.empty?
        sleep(WAIT_INTERVAL)
        return read_nonblock_loop(io)
      else
        @tries = 0
        return got
      end
    end
  end
end

#too_many_tries? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/halfshell/terminal.rb', line 61

def too_many_tries?
  @tries >= @max_tries
end