>>>>> "John" == John B Clements <email@example.com> writes:
John> How do I change it so that any error halts the whole string?
John> Here's my solution, but it seems like there must be a more
John> idiomatic way of doing this:
>> (define (propagate-error x) (if x #t (error 'sub-error)))
>> (&& (begin (propagate-error (&& (rm nonexistentfile)
John> (echo aaaa))))
John> (echo bbb))
John> rm: nonexistentfile: No such file or directory
John> Error: sub-error
John> This would seem like a common problem.
I think your solution is OK; while I've never used && in a script of
mine, I find myself writing code similar to yours.
John> Also, it's a pain to abstract over &&, because it's a macro.
Yes. The shell subsystem design is fucked. It'll get completely
replaced in post-0.6 scsh. In particular, there'll be a
compositional, value-level algebra for the things which are currently
process forms, so a lot of those macros will go away, and they'll
mostly be syntactic sugar over procedural equivalents. (Which they
Cheers =8-} Mike
Friede, Völkerverständigung und überhaupt blabla