Obtaining the path of the application program?

Jeff Henrikson <[email protected]> Thu, 26 Aug 2021 07:51:35 -0700
Newsgroups gmane.comp.lang.racket.user,gmane.lisp.scheme.plt
Message-ID <[email protected]> 
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Racket users,

Many software applications use their location in the filesystem to=20
establish filesystem relationships between their executable file, their=20
configuration and their data.=C2=A0 For this purpose, C provides the first=
=20
element of the string array provided to main, python provides __file__,=20
bash provides ${BASH_SOURCE[0]}, etc.

Racket strips said value before current-command-line-arguments receives=20
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)
     =C2=A0 (datum->syntax
     =C2=A0=C2=A0 (quote-syntax here)
     =C2=A0=C2=A0 (syntax-source stx)
     =C2=A0=C2=A0 stx))

Macro get-current-source works as intended if called at program startup=20
and the program is compiled on the fly with:

    racket program.rkt

However get-current-source has the unintended property of memorizing the=20
original source location if the program is compiled with raco exe (and=20
then moved).

Is there a way in racket to obtain the path of the application program?


Jeff Henrikson


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      <p>Racket users,<br>
        <br>
        Many software applications use their location in the filesystem
        to establish filesystem relationships between their executable
        file, their configuration and their data.=C2=A0 For this purpose, C
        provides the first element of the string array provided to main,
        python provides __file__, bash provides ${BASH_SOURCE[0]}, etc.<br>
        <br>
        Racket strips said value before current-command-line-arguments
        receives the subsequent command-line arguments from the
        operating system.<br>
        <br>
        A related value can be pulled from syntax-source as follows:<br>
      </p>
      <blockquote>(define-syntax (get-current-source stx)<br>
        =C2=A0 (datum-&gt;syntax<br>
        =C2=A0=C2=A0 (quote-syntax here)<br>
        =C2=A0=C2=A0 (syntax-source stx)<br>
        =C2=A0=C2=A0 stx))<br>
      </blockquote>
      <p>Macro get-current-source works as intended if called at program
        startup and the program is compiled on the fly with:<br>
      </p>
      <blockquote>racket program.rkt<br>
      </blockquote>
      <p>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).</p>
      Is there a way in racket to obtain the path of the application
      program?
      <p><br>
      </p>
      <p>Jeff Henrikson</p>
      <p><br>
      </p>
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<p></p>

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