Taylor Venable wrote:
> On Thu, Apr 02, 2009 at 07:51:21PM -0700, Gary Johnson wrote:
> > On 2009-04-02, Taylor Venable wrote:
> > > I have an xterm compiled with 256 color support. In Vim 7.2.88 after
> > > it loads up I can do :set t_Co to find that 256 color support is being
> > > found correctly (TERM = xterm-color). However, I cannot figure out
> > > how to determine whether 256 colors are supported on startup, as the
> > > value of t_Co is 8 at the time my .vimrc is loaded.
> > >
> > > I've tried a few autocommands, such as VimEnter and TermChanged but
> > > the value of t_Co in both of them is still 8, rather than the 256 I
> > > expect. At what point does t_Co get set to reflect the capabilities
> > > of the terminal, and how can I detect it during startup?
> >
> > Or are you saying that t_Co gets set automatically somehow to 256
> > and you don't know where that is? If so, you can find out by
> > executing
> >
> > :verbose set t_Co?
>
> Somebody on IRC suggested this too but all this command shows is that
> t_Co = 256 and no hint of where it came from. The value is definitely
> 8 while .vimrc is being executed but at some point after that (also
> after the VimEnter autocommand) it's being set to 256.
It's magic! :-)
What happens is that on startup Vim determines the terminal settings
from the termcap/terminfo and builtin defaults. These may differ from
what the terminal actually uses, so for xterm we have built in a
mechanism to ask the xterm the actual values. This happens after
startup, Vim sends a few escape sequences to xterm and it responds with
a few specific escape sequences. The number of colors supported is one
of the values. This takes a little time, thus it's done asynchronously.
You may also see that the intro screen disappears. This happens when
the value of the t_Co option changes, Vim needs to redraw the screen
then to get the colors right.
I haven't tried it, but I think you can use the ColorScheme autocommand
event to handle the change, since when t_Co changes the color scheme is
reloaded.
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