I am going to start a new thread for this because this is a cool
feature that will need some testing.
In the headlines of @file, @thin, @shadow nodes, etc, Leo will
evaluate {{expr}} and substitute the result in the path. For example,
test.leo contains the following setting:
@string test = c:\leo.repo\trunk\leo\test
So the node:
@shadow {{c.config.getString('test')}}/eval-shadow-test.txt
is equivalent to:
@shadow c:\leo.repo\trunk\leo\test\eval-shadow-test.txt
Which is pretty cool. The evaluation is done by a helper of
g.os_path_finalize and g.os_path_finalize_join, in a context with
'g','os' and 'sys' defined.
Similarly, in places where 'c' is defined, Leo uses c.os_path_finalize
and c.os_path_finalize_join. In those cases, the expression is
evaluated in a context with 'c','g','p','os' and 'sys' defined.
Warning: this feature is lightly tested. The code that evaluates
expression is not the problem. Rather, the problem is that there are/
were dozens of calls to g.os_path_finalize and g.os_path_finalize_join
in Leo's core, and some (but not all!) of those calls can be converted
to the corresponding g.os_path methods.
For example, it had better be the case that the atFile write methods
use the same methods as the atFile read methods. It *appears* that
this is so (this feature works with @thin, @file and @shadow) but
there are plenty of opportunities for subtle problems.
In short, please do use this feature, but be careful.
Edward
P.S. As I write this, I'm not sure whether @path supports {{expr}}
yet, but it will eventually. I don't say 'immediately' because there
is some tricky integration of the new directive-handling code to be
done first.
EKR
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