How do I get the OS System Font Directory(Cross-Platform) in python?

Steven D'Aprano steve+comp.lang.python at pearwood.info
Fri Jul 12 06:55:35 CEST 2013


On Thu, 11 Jul 2013 21:24:00 -0700, Metallicow wrote:

> Forgot to add >>> part. Is there any way to edit posts? 

Not unless thousands of people give you access to their computer so you 
can edit the emails in their inboxes.

When you send a post to a public mailing list, its out their on fifty 
thousand computers and a dozen public archives. No, you can't change your 
mind and edit what you've already said.


> Don't see an edit linky anywhere. Is there something
> wrong with using os.environ...? win32api stuff is another dependency. Is
> it really needed?

If you want to do it the right way, yes.

In principle, any Windows machine could set the font directory to any 
valid directory. The only way to be sure you have got the right one is to 
ask Windows for the font directory, and that requires win32api.

If you intend for this to be usable everywhere, my approach would be this:

1) You need a separate function for each platform you intend to support. 
At the very least, you should support Windows (2000, XP, Vista, 7 and 8), 
OS-X (Mac), Linux. You should also strongly consider supporting Android, 
FreeBSD, OpenBSD, and Solaris. If you intend running under older versions 
of Python, you should also consider supporting Windows CE. You might even 
like to support iOS.

2) Some of these (Windows, probably Mac and iOS) will require a call to 
the OS to find the current directory. That means a win32api or equivalent 
call.

3) If win32api is not available, you might like to fall back on a 
heuristic to guess the right directory. But remember that is only a 
little bit better than hard-coding a directory.

4) For Linux and Free- and OpenBSD, there is no standard font directory. 
You may be able to make a call to the GUI toolkit to ask what it thinks 
the font directory (or directories!) is, but there are many different 
toolkits, and they can all be active at the same time. E.g. I might run a 
Gnome app and a KDE app both under XFCE, plus OpenOffice, and all three 
might disagree as to what fonts I have available.

The standard way to locate fonts in Linux is to look at two files, 
/etc/fonts/fonts.conf and /etc/fonts/local.conf, which list the locations 
you should check. Either, or both, files may be missing. Standard 
locations include: 

/usr/share/fonts
/usr/local/share/fonts
/home/<username>/.fonts
/usr/X11R6/lib/X11/fonts
/usr/share/X11/fonts/Type1
/usr/share/X11/fonts/OTF

And of course, applications like OpenOffice might keep their own, 
private, font directory, just because.

5) Now that you have a function for each OS you support, you can create a 
master function that detects the OS and calls the appropriate one. Now at 
last you have a simple function get_font_directory() that works 
everywhere.

Now that you see how complex it is to write this "simple" function, are 
you surprised that one doesn't yet exist?


:-)



-- 
Steven



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