On 24Feb2019 17:48, boB Stepp <robertvst...@gmail.com> wrote:
On Sun, Feb 24, 2019 at 2:52 PM Mats Wichmann <m...@wichmann.us> wrote:
If it's snippets you want, I always look at programcreek. These are
always part of something bigger so they may not fit your request to have
them be something you can run.
https://www.programcreek.com/python/example/57429/curses.is_term_resized
Thanks for the link! It looks useful for future research!
Seconded. I did not know about this either!
However,
in the context of the current discussion, especially after Cameron's
revelations, I cannot help but wonder if the writers of the three code
snippets did not truly understand resizeterm()? Especially the first
example is very similar to my testing script. But I did not go to the
full-fledge programs to see if there was something unusual going on,
so I may be overly harsh is my first impression.
I think the first two snippets definitely don't. The third I'm less sure
about. resizeterm is easy to misunderstand.
Anyway, I should add a few remarks:
1: the use case for resizeterm() is for when curses has not noticed a
resize. This can happen in remote terminal environments or where for
some very weird reason the curses programme isn't in the terminal's
control group. Most remote facilities (eg ssh and telnet) try to
propagate terminal resize information, so remote curses stays informed.
2: much more useful is is_term_resized(). Many curses programmes need to
know the termianl size (from getmaxyx()) in order to size their output
(crop long lines, scale subwindows, what have you). So you might
reasonably keep a copy of the result of getmaxyx() at the start of the
programme:
tty_y, tty_x = getmaxyx()
and then call:
if is_term_resized(tty_y, tty_x):
# update size
tty_y, tty_x = getmaxyx()
# recompute the sizes for various displayed things
# redisplay everything...
at suitable times, because is_term_resized() is exactly for checking if
the actual size (known by curses) matches some notional size (tty_y,
tty_x, known by you, the programmer).
All is is_term_resized, resizeterm and the "internal" resize_term
functions are recent additions :-) From "man 3 resizeterm":
This extension of ncurses was introduced in mid-1995. It was
adopted in NetBSD curses (2001) and PDCurses (2003).
Cheers,
Cameron Simpson <c...@cskk.id.au>
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