[BRLTTY] New configuration file directives.

[Dave Mielke]

For those who wish they could have fancier configuration files (brltty.conf), a 
few new directives have been added. Note that they're only available in the 
development stream so far. They are:

   include <file>
   assign <variable> <value>
   ifVar <variable> [<statement>]
   ifNotVar <variable> [<statement>]
   ifSet <directive> [<statement>]
   ifNotSet <directive> [<statement>]
   else
   endIf

In the above, items enclosed within <angle brackets> aren't literal (you need 
to supply their values), and items enclosed within [square brackets] are 
optional.

For now, rather than writing detailed documentation, I'm hoping that the 
following examples will suffice. They're three of my own files. If anything is 
unclear, do ask.

brltty-vo.conf (for testing a Voyager display):
   assign brailleDriver vo
   braille-device usb:

   include brltty-all.conf


brltty-bp.conf (for testing an older Braille Pen device):
   assign brailleDriver vo
   braille-device bluetooth:XX:XX:XX:XX:XX:XX

   preferences-file bp.prefs
   include brltty-all.conf


brltty-all.conf (included by all higher level configuration files):
   ifVar brailleDriver
     braille-driver \{brailleDriver}
     ifNotSet preferences-file preferences-file \{brailleDriver}.prefs
   endIf

   ifVar apiSession
     no-api off
     api-parameters host=:\{apiSession}
   else
     no-api on
   endIf

   speech-driver es
   text-table en_CA
   contraction-table en-us-g2


-- 
Dave Mielke           | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario   | http://Mielke.cc/bible/
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