Trying again with with-simple-restart

Дата публікації:
27/02/2013 04:13

Постійна адреса новини:
http://www.vsinovyny.com/8323837

Trying again with with-simple-restart

27/02/2013 04:13 // Common Lisp Tips

I have some code that reads data from a config file. If there’s a problem loading, I’d like the opportunity to fix it, outside of Lisp, and retry loading. It’s easy to do that with with-simple-restart and loop:

(loop 
  (with-simple-restart (try-again "Try again")
    (return 
     (progn 
       (setf *config* (load-config-file))))

If any error occurs during load-config-file, I can either fix up the file and choose the try-again restart, or give up and use an abort restart.

(Thanks to Frode Vatvedt Fjeld for the concise idiom.)

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