[Octave-bug-tracker] [bug #44095] readline configuration - tab autocompletion of paths

[Libor Morkovsky]

Follow-up Comment #5, bug #44095 (project octave):

The rebased version looks good to me.

I created the patch with git, because I used the tarball as source - had some
checkout issues with hg, and I'm more familiar with git..

My suggested commit message, I tried to be concise:

directory commands can autocomplete across slash (bug #44095)

* libinterp/corefcn/input.cc (dir_word_breaker) Add a context sensitive 
  function returning word delimiters for GNU readline, limiting  the 
  character set to only space, tab and newline for directory commands
  - currently 'ls' and 'cd'.
  (generate_completion) Register the dir_word_breaker function with 
  current command_editor.
* liboctave/util/cmd-edit.cc (gnu_readline::*, command_editor::*) Add 
  word break callback setter mimicking the structure of other callbacks.
* liboctave/util/cmd-edit.h (command_editor::*) Add word  break callback 
  setter mimicking the structure of other callbacks.
* liboctave/util/oct-rl-edit.c (octave_rl_set_word_break_function)  Add a
  function that sets GNU readline variable rl_completion_word_break_hook.
* liboctave/util/oct-rl-edit.h Add a type definition and setter function
  for GNU readline variable rl_completion_word_break_hook.


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