David Storrs wrote on 01/19/2017 03:08 PM:
of events but I still know nothing about detecting filesystem change
events. I've looked through PLaneT and found nothing that seems like
an FS-monitoring package. Can anyone suggest how to do this?
Here's a simple example, using `sync`:
#lang racket
(define my-fs-change-evt (filesystem-change-evt "/home/user"))
(printf "sync...~n")
(sync my-fs-change-evt)
(printf "synced!~n")
I ran this example on GNU/Linux, and then used the command `touch
/home/user/x`, which caused the `sync` procedure to return.
See the documentation in the vicinity of that for `sync`, for other
other ways to use synchronizable objects. They're essential for some
kinds of I/O programming, not just GUI.
Don't be scared away by the events (and ports documentation. I've done
a bunch of low-level programming in C, of I/O and such, and I still find
some of the Racket documentation for related concepts to be
intimidating. (Well, there is one big thing in there that's scared me
off the few times I've wanted to use it, but each time, I was on the
clock for a consulting client, so I did things in the known-quantity way
instead. Much of the primitives are simple, however, and the work is in
building correct and efficient programs around the primitives.)
BTW, You don't want "PLaneT", which was the old (and wise) package
system. Almost all current development has moved from PLaneT to
"pkgs.racket-lang.org".
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