Fake EOF?

Is there a way for an application to signal to prompt_toolkit that it should pretend an EOF has happened (typically making the application exit)? Something like this works with readline but not with prompt_toolkit:

In [1]: import os; f = open(os.devnull); os.dup2(f.fileno(), 0)

In [2]:      
Traceback (most recent call last):
  File "/usr/local/src/sage-config/local/bin/ipython", line 5, in <module>
    start_ipython()
  File "/usr/local/src/sage-config/local/lib/python2.7/site-packages/IPython/__init__.py", line 119, in start_ipython
    return launch_new_instance(argv=argv, **kwargs)
  File "/usr/local/src/sage-config/local/lib/python2.7/site-packages/traitlets/config/application.py", line 596, in launch_instance
    app.start()
  File "/usr/local/src/sage-config/local/lib/python2.7/site-packages/IPython/terminal/ipapp.py", line 348, in start
    self.shell.mainloop()
  File "/usr/local/src/sage-config/local/lib/python2.7/site-packages/IPython/terminal/interactiveshell.py", line 402, in mainloop
    self.interact()
  File "/usr/local/src/sage-config/local/lib/python2.7/site-packages/IPython/terminal/interactiveshell.py", line 385, in interact
    code = self.prompt_for_code()
  File "/usr/local/src/sage-config/local/lib/python2.7/site-packages/IPython/terminal/interactiveshell.py", line 321, in prompt_for_code
    pre_run=self.pre_prompt, reset_current_buffer=True)
  File "build/bdist.linux-x86_64/egg/prompt_toolkit/interface.py", line 385, in run
    with self.input.raw_mode():
  File "build/bdist.linux-x86_64/egg/prompt_toolkit/input.py", line 69, in raw_mode
    return raw_mode(self.stdin.fileno())
  File "build/bdist.linux-x86_64/egg/prompt_toolkit/terminal/vt100_input.py", line 409, in __init__
    self.attrs_before = termios.tcgetattr(fileno)
error: (25, 'Inappropriate ioctl for device')

My use case is a signal handler forcing the application to exit gracefully.

cli.exit() is documented as being equivalent to pressing Ctrl-D.

http://python-prompt-toolkit.readthedocs.io/en/latest/pages/reference.html#prompt_toolkit.interface.CommandLineInterface.exit

cli.exit() is documented as being equivalent to pressing Ctrl-D.

But that does not work asynchronously. I want a solution which would work while prompt_toolkit is actually waiting for user input.

@jdemeyer

Hi @jdemeyer,
Thanks for this request. I made a pull request that will probably solve the issue: #393

However, I wonder why you would ever dup devnull to fd 0.

However, I wonder why you would ever dup devnull to fd 0.

Because that did the trick for readline :-)

Closing this now. In prompt_toolkit 2.0, calling get_app().exit() should close the current application. This can be done in any key binding, and works asynchronously. Please open again or create a new issue if this still doesn't work.

from prompt_toolkit.application.current import get_app

@global_kb.add('f10')  # F10
def quit(event):
    get_app().exit()

This make prompt return None. Not the same as pressing Ctrl+D which raises EOFError.

get_app().exit(exception=EOFError)

should probably do it.

It does. Thanks. =)

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Fake EOF? #392

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takluyver commented on Sep 13, 2016

jdemeyer commented on Sep 13, 2016

jonathanslenders commented on Sep 13, 2016

jdemeyer commented on Sep 13, 2016

jonathanslenders commented on May 15, 2018

techtonik commented on Jul 5, 2018

jonathanslenders commented on Jul 5, 2018

techtonik commented on Jul 5, 2018

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