stan wrote:
Recently I had cause to go digging into ps-print.el (turned out to be
version problems in cygwin emacs) and I ran accross something I don't
understand. For the record I'm not by any means an elisp programmer but
I can usually at least read the code and do some simple things.
The line I don't think I understand is
(and (fboundp 'start-process) 0)
Actually that's a fragment of a larger expression. It looks to me like
this will always be nil. Is this some idiom I haven't seeen or is this
just a synonym fo nil?
No, this expression returns nil or 0 (zero).
It's evaluated as the 5th parameter (buffer) of call-process-region.
Typing C-h f call-process-region RET, you can read:
......
If buffer is 0, `call-process-region' returns immediately with
value nil.
Otherwise it waits for program to terminate
and returns a numeric exit status or a signal description string.
......
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