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Allow readline.file to be missing

See original GitHub issue

See indygreg/PyOxidizer#69 for more info about why, but the tl;dr version is __file__ is an optional attribute and should not be relied upon.

Currently cmd2 fails under PyOxidizer with:

  File "cmd2", line 15, in <module>
  File "cmd2.cmd2", line 56, in <module>
  File "cmd2.rl_utils", line 120, in <module>
AttributeError: module 'readline' has no attribute '__file__'

If sys.oxidized is set, and readline is imported (and isnt libedit), then any symbols needed are in the binary, if that is helpful.

Issue Analytics

State:
Created 4 years ago
Comments:7 (5 by maintainers)

Top GitHub Comments

1reaction

kmvanbruntcommented, Nov 11, 2019

@jayvdb Here are the symbols we use from the readline.so file.

rl_basic_quote_characters
rl_display_match_list
rl_forced_update_display
rl_display_fixed
rl_point
rl_set_prompt

0reactions

tleonhardtcommented, Nov 17, 2019

@kmvanbrunt If we do this, I think we should do it in a fairly generic and robust fashion where there is a degraded mode in which we have access to the normal Python readline package functionality but do not have access to the extended functionality for which we are using ctypes to directly call functions in the readline dynamic library which are not wrapped by Python’s readline package. There should also be a good warning message printed in yellow upon startup of a cmd2 application functioning in this degraded mode notifying the user that this is happening. Moreover, the Sphinx docs should be updated to explain what features are not available in this degraded mode. This degraded mode shouldn’t be exclusive to PyOxidizer.

We may also wish to submit a feature request and/or PR to CPython for wrapping the missing functionality which is necessitating our usage of ctypes.

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