Rodolfo Carvalho wrote at 06/02/2011 05:42 PM:
I would like a have a file that when run standalone executes some
code, and when "required" by another module just provides some
definitions.
The following works on Linux. You might have to change the "/usr/bin"
to be whatever directory your "racket" executable is in.
#!/usr/bin/racket -ucm
#lang racket/base
(define foo 42)
(define (bar x) (* x 2))
(define (main)
(display "Hello, world!\n"))
(provide foo bar main)
If "-ucm" is difficult to remember, the "m" has to be last, but one can
swap the order of the "u" and the "c", for a mnemonic that no student
will forget.
Also, "-M" (uppercase) isn't yet used as a command line option, so that
might be good shorthand to add for this kind of module/script. Perhaps
"-M" could permit the procedure name after, since requiring multiple
modules providing "main" would be a pain outweighing the convenience,
IMHO. I think it would require a low-level change to the command-line
parser (since"#!" wants to read only a single argument).
--
http://www.neilvandyke.org/
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