On 8/26/21 8:14 AM, Matthew Flatt wrote:
The analog to the first argument to main in C is
(find-system-path 'run-file)
I think that's probably what you want.
Yes, this has the behavior I want. Thank you.
Procedure find-system-path seems well documented once one finds its
section. But not knowing what to search for, I found it hard to find in
the documentation. It seems like one easy concrete discoverability
improvement would be to mention (find-system-path 'run-file) in the docs
for current-command-line-arguments, command-line, or both. I was sure
to look carefully in those places.
Regards,
Jeff Henrikson
On 8/26/21 8:14 AM, Matthew Flatt wrote:
The analog to the first argument to main in C is
(find-system-path 'run-file)
I think that's probably what you want.
Something closer to `get-current-source` but adapting to a run-time
file is
(variable-reference->module-source
(#%variable-reference))
Here, `(#%variable-reference)` is the primitive form that obtains a
connection to the enclosing module at run time. If you create an
executable with `raco exe`, though, the "source" of the module will be
a symbolic name instead of a path, because a module that's embedded in
an executable doesn't have a file identity anymore.
At Thu, 26 Aug 2021 07:51:35 -0700, Jeff Henrikson wrote:
Racket users,
Many software applications use their location in the filesystem to
establish filesystem relationships between their executable file, their
configuration and their data. For this purpose, C provides the first
element of the string array provided to main, python provides __file__,
bash provides ${BASH_SOURCE[0]}, etc.
Racket strips said value before current-command-line-arguments receives
the subsequent command-line arguments from the operating system.
A related value can be pulled from syntax-source as follows:
(define-syntax (get-current-source stx)
(datum->syntax
(quote-syntax here)
(syntax-source stx)
stx))
Macro get-current-source works as intended if called at program startup
and the program is compiled on the fly with:
racket program.rkt
However get-current-source has the unintended property of memorizing the
original source location if the program is compiled with raco exe (and
then moved).
Is there a way in racket to obtain the path of the application program?
Jeff Henrikson
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