Re: base-[files|password] for 1.7 (was Re: Cygwin 1.7.0-20 (was Re: Cygwin 1.7.0-19 (was Re: New Cygwin 1.7.0-18 in release-2)))

[Eric Blake <ebb9@byu.net>]

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According to Corinna Vinschen on 7/28/2008 9:27 AM:
|> # check the window size after each command and, if necessary,
|> # update the values of LINES and COLUMNS.
|> shopt -s checkwinsize
|>
|> would it work in cygwin?  Also;
|
| Looks like bash on Cygwin doesn't set LINES and COLUMNS.  Eric?

Hmm.  Right now, bash _does_ set LINES and COLUMNS (as shell variables,
you have to export them for children to see), but only after the first
SIGWINCH, or if you have 'shopt -s checkwinsize', after the first
non-builtin-command (ie. if checkwinsize is set, bash does not check
window size after builtins - how weird is that?).  At any rate, I already
have a cygwin-specific patch for the upstream bug that lib/sh/winsize.c
forgot to include <termios.h>.  And blindly setting checkwinsize seems
like it would slow things down: since SIGWINCH works (I tested in both cmd
and urxvt), there is no need to slow down bash to check window size after
every single command, when only window size changes are necessary.
checkwinsize is primarily for those platforms that lack SIGWINCH.

At any rate, you've given me an idea.  Add this to /etc/profile, and
$LINES and $COLUMNS will be automatically populated for all users,
regardless of whether they use 'shopt -s checkwinsize':

kill -s WINCH $$

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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