gh-84388: Expose NCURSES_EXT_FUNCS

[isidentical]

https://bugs.python.org/issue40207

• Issue: Expose NCURSES_EXT_FUNCS under curses #84388

[isidentical]

@serhiy-storchaka the tests from set_escdelay/set_tabsize (and get-s) are failing under some platforms due to their inexistance. Could you review this PR?

[serhiy-storchaka]

Would not be more reliable to use hasattr(curses, 'set_escdelay')? AFAIK set_escdelay and set_tabsize are supported in the NetBSD curses, so we may add their support with non-ncurses implementations.

[isidentical]

@serhiy-storchaka do you have a source for me that when was they introduced (or was they always available)? Because for the current implementation, we only support ncurses.

cpython/Modules/_cursesmodule.c

Line 3258 in f453221

#if defined(NCURSES_EXT_FUNCS) && NCURSES_EXT_FUNCS >= 20081102

[isidentical]

After digging through the internet, I couldn't find any relevant information about this (when was they introduced, how can I check their existance or not etc). We might want to go with a config variable (like HAVE_CURSES_TABSIZE etc. but looks like it is a bit overkill. I'll change the tests according to a getatr call, but I dont want to introduce netbsd support on this PR (because I have literally no information about that system). It might be an open issue, but for this PR's concern, it only exposes NCURSES_EXT_FUNCS and manages tests to run when they needed.

[furkanonder]

@isidentical Could you resolve the conflict?

[ghost]

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[picnixz]

Since it's a conditional constant, we should probably say that it's conditional in the docs, shouldn't we?

[serhiy-storchaka]

I have doubts that this will be useful.

• The hasattr() check is more reliable.
• If you need the NCURSES_EXT_FUNCS value, it is already available as ncurses_version().patch.
• It's value is not enough, as the behavior depends also on other macros, like NCURSES_EXT_COLORS and HAVE_NCURSESW.