How does a macro properly expand to a define-runtime-path?
The documentation for define-runtime-path says this:
If the form has a source module according to syntax-source-module
<file:///Applications/Racket/2017-10-29/Racket%20v6.11.0.2/doc/reference/stxops.html#%28def._%28%28quote._~23~25kernel%29._syntax-source-module%29%29>,
then the source location is determined by preserving the original expression
as a syntax object, extracting its source module path at run time (again using
syntax-source-module
<file:///Applications/Racket/2017-10-29/Racket%20v6.11.0.2/doc/reference/stxops.html#%28def._%28%28quote._~23~25kernel%29._syntax-source-module%29%29>),
and then resolving the resulting module path index.
If the expression has no source module, the syntax-source
<file:///Applications/Racket/2017-10-29/Racket%20v6.11.0.2/doc/reference/stxops.html#%28def._%28%28quote._~23~25kernel%29._syntax-source%29%29>
location associated with the form is used, if is a string or path.
If no source module is available, and syntax-source
<file:///Applications/Racket/2017-10-29/Racket%20v6.11.0.2/doc/reference/stxops.html#%28def._%28%28quote._~23~25kernel%29._syntax-source%29%29>
produces no path, then current-load-relative-directory
<file:///Applications/Racket/2017-10-29/Racket%20v6.11.0.2/doc/reference/eval.html#%28def._%28%28quote._~23~25kernel%29._current-load-relative-directory%29%29>
is used if it is not #f. Finally, current-directory
<file:///Applications/Racket/2017-10-29/Racket%20v6.11.0.2/doc/reference/Filesystem.html#%28def._%28%28quote._~23~25kernel%29._current-directory%29%29>
is used if all else fails.
This tells me that if I want to specify the path it uses to anchor relative
paths, I should give the define-runtime-path form a source location from the
file I want it to use.
(define-syntax-parser macro
[(_ name path-expr)
(quasisyntax/loc #'name
(define-runtime-path name path-expr))])
However, this doesn't work. It finds paths relative to the macro's source file
instead of the file that `name` came from.
What is the proper way to do this?
(Going through the steps from the documentation:
* syntax-source-module returns #<module-path-index:()>, which I assume it
doesn't use.
* syntax-source returns #<path:/Users/Alex/Desktop/try-runtime-path/use.rkt>,
which I assume it should use.
I want it to use the use.rkt path as the anchor, but instead
define-runtime-path is using the macro path. Why? What am I doing wrong?)
Alex Knauth
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