Re: [matplotlib-devel] Add some caching to texmanager.py?

[Fernando P. <Fer...@co...>]

Stephen Walton wrote:
> Fernando Perez wrote:
> 
> 
>>It may be simpler than that:
> 
> 
> So os.environ does change the environment under Python and its 
> children.  The remaining question is what should TEXMFOUTPUT be?  
> /home/user/.tex.cache will not work across all platforms.

Well, it could be something like $HOME/.tex.cache, where $HOME can be 
determined via a routine like the below (this is what ipython uses to 
try and guess a sensible value for $HOME):

#----------------------------------------------------------------------------
class HomeDirError(Error):
     pass

def get_home_dir():
     """Return the closest possible equivalent to a 'home' directory.

     We first try $HOME.  Absent that, on NT it's $HOMEDRIVE\$HOMEPATH.

     Currently only Posix and NT are implemented, a HomeDirError 
exception is
     raised for all other OSes. """ #'

     try:
         return os.environ['HOME']
     except KeyError:
         if os.name == 'posix':
             raise HomeDirError,'undefined $HOME, IPython can not proceed.'
         elif os.name == 'nt':
             # For some strange reason, win9x returns 'nt' for os.name.
             try:
                 return 
os.path.join(os.environ['HOMEDRIVE'],os.environ['HOMEPATH'])
             except:
                 try:
                     # Use the registry to get the 'My Documents' folder.
                     import _winreg as wreg
                     key = wreg.OpenKey(wreg.HKEY_CURRENT_USER,
 
"Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders")
                     homedir = wreg.QueryValueEx(key,'Personal')[0]
                     key.Close()
                     return homedir
                 except:
                     return 'C:\\'
         elif os.name == 'dos':
             # Desperate, may do absurd things in classic MacOS. May 
work under DOS.
             return 'C:\\'
         else:
             raise HomeDirError,'support for your operating system not 
implemented.'

Cheers,

f