Re: [PyMOL] Detecting Plugins menu

[Thomas H. <tho...@sc...>]

Hi Spencer,

yes it's a private variable and as such was never supposed to serve as
X11 (or Tkinter) availability check... but: I would (and did) also use
it, since it's the best option to check this right now.

Cheers,
  Thomas

Spencer Bliven wrote, On 04/22/14 10:46:
> I just found the pymol._ext_gui property, which seems to be None if X11
> is off and a positive number if X11 is present. Seeing as it's a private
> variable, is it ok to use this to check for X11 presence?
> 
> -Spencer
> 
> 
> On Thu, Apr 17, 2014 at 10:21 AM, Spencer Bliven <sb...@uc...
> <mailto:sb...@uc...>> wrote:
> 
>     Here's what I'm currently using. It seems to work so far. Looking
>     through the PyMol binary I see about 50 possible names though, so it
>     would be nice if there were a built-in way to detect X11.
> 
>     def hasTk():
>         """ Make an educated guess as to whether Tk is installed,
>         hopefully without triggering any installation on Macs
>         """
>         hasTk = True
>         if sys.platform=="darwin": #Mac
>             # Hack: check the path for entries containing 'X11'
>             hasTk = any([ "X11" in p.upper() for p in sys.path])
>        
>         if hasTk:
>             try:
>                 import Tkinter
>             except ImportError:
>                 hasTk = False
> 
>         return hasTk
> 
> 
>     On Mon, Apr 14, 2014 at 10:46 AM, Spencer Bliven <sb...@uc...
>     <mailto:sb...@uc...>> wrote:
> 
>         I'm working on a plugin with a command line interface and a
>         light-weight tk interface through the plugins menu. This works
>         fine on Linux, Windows, and open-source Mac builds, but not on
>         MacPyMol.app. Importing Tkinter causes PyMol to quit with a
>         prompt to install X11 (but not an ImportError, as far as I can
>         tell). If X11 is installed there are no errors, but there is not
>         a plugins menu, so I'd rather not bother loading and
>         initializing the Tk interface to the plugin.
> 
>         How can I detect whether Tk is available?
> 
>         I can think of two approaches, but haven't figured out the
>         correct commands for either. (1) Check the name that pymol was
>         started with. "MacPyMol.app" does not have Tk, while
>         "PyMOLX11Hybrid.app" does.  I'm not sure how to get the name
>         (maybe could be guessed from sys.path?), and I know there are a
>         lot more variants than those two available. (2) Check for the
>         existence of the plugins menu. But this would have to be done
>         without importing Tk and triggering the X11 check.
> 
>         Is there a simple way to do this I'm overlooking?
> 
>         Thanks,
>         -Spencer

-- 
Thomas Holder
PyMOL
Schrödinger, Inc.