Re: When is an xterm's t_Co detected?

Gary Johnson wrote:

> I recently learned that Vim can query an xterm directly for the
> number of colors it supports. (This is not necessarily the same
> value reported by terminfo. Otherwise, it wouldn't be very useful.)
> Vim then sets t_Co to this number. I would like to use that value
> to affect other color settings, but I can't figure out when to do
> that. I captured the value of &t_Co at the start and end of my
> ~/.vimrc and upon these autocommand events,
>
> BufWinEnter
> ColorScheme
> FileType
> OptionSet
> TermResponse
> VimEnter
>
> but the value was always 8. By the time I queried the value from
> Vim's command line, though, the value was 256.
>
> What event do I need to wait for to determine that t_Co may have
> changed to 256?

Can't think of something. We do have the OptionSet autocommand event,
but it's not triggered in this case. Perhaps we should make a change
for that. The code is near the end of set_num_option().

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