[plt-scheme] Loading at runtime

From: Matt Jadud (jadudm at gmail.com)
Date: Sat Oct 6 23:38:23 EDT 2007

On 10/6/07, Matthew Flatt <mflatt at cs.utah.edu> wrote:
> If you really want to manually find file relative to the executable,
> though, then try
>    (find-executable-path (find-system-path 'exec-file)
>                          "filename.dat")

(find-system-path 'exec-file)

gives me something down in the Mac application bundle, so I need to
pop back up out to get to the datafile that is adjacent to the
executable (bundle).

I ended up with something between the suggestions from Robby and Matthew.

(define (dyn-file fname)
    (let-values ([(base name x)
                    (find-system-path 'exec-file)))])

      (case (system-type)
          (build-path base 'up 'up 'up fname))]
        [(windows) '...])))

That feels ugly for what I'm trying to do. That said, this gets me to
a datafile that a user is going to modify, and the application will
load data from that file at run-time. And for now, I'm "hard-coding"
the fact that, no matter where the application lives, the datafile
will be adjacent to the executable. Perhaps I should just pop open a
'File Open' dialog and be done with it... but this will do for the
task at hand, I think.

Thanks for the pointers; I wasn't about to stumble on the correct
one-two combo on my own.


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