Loading a module from the current-working-directory

Loading a module from the current-working-directory

[Joel James Adamson]

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Hello,

I've written a simple module:

(define-module (popgen popgen))
(export popgen)


(use-modules (ice-9 format))
(define *numprec*  "~10,8,,,0f ")
(define *numformat* (string-append "~{" *numprec* "~}~%"))

(define (popgen popfun data)
  ;; POPFUN is a function that evaluates the vector DATA to yield the
  ;; next generation's data; print the data to the terminal and then
  ;; check the result of evaluating (popfun data); if the new vector
  ;; is close enough to the old one, exit and return #f; otherwise
  ;; call (popgen POPFUN (POPFUN DATA))
  ;;
  ;; First print the data to the current-output-port (user routines
  ;; may want to modify this to send the data down a pipe)

  (format #t "~{~}~%" num-format (vector->list data))
  (let* ((new (popfun data))
	 (diff (eudiff (new data))))
    (cond ((< diff 1e-15) #f)
	  (else (popgen popfun new)))))

(define (eudiff vec1 vec2)
  (sqrt (apply
	 +
	 (map (lambda (x y)
		(* (- x y) (- x y)))
	      (vector->list vec1)
	      (vector->list vec2)))))

I'd like to test its features at the REPL, but I am having serious
trouble loading it.  I'm not sure if the problem is in the definition or
how I'm loading it.

I get the following behavior:

guile> %load-path
("/usr/share/guile/site" "/usr/share/guile/1.8" "/usr/share/guile")
guile> (set! %load-path (cons (getcwd) %load-path))
guile> %load-path
("/home/joel/Documents/ss_theory/scm" "/usr/share/guile/site" "/usr/share/guile/1.8" "/usr/share/guile")
guile> (use-modules (popgen popgen))

Backtrace:
In standard input:
  76: 0* (use-modules (popgen popgen))
  76: 1  (eval-case (# # *unspecified*) (else #))
  76: 2  (begin (process-use-modules (list (list #))) *unspecified*)
In unknown file:
   ?: 3* [process-use-modules (((popgen popgen)))]

<unnamed port>: In procedure process-use-modules in expression (process-use-modules (list #)):
<unnamed port>: no code for module (popgen popgen)
ABORT: (misc-error)

Where am I going wrong?

Thanks,

Joel
-- 
Joel J. Adamson
Servedio Lab
University of North Carolina at Chapel Hill

FSF Member #8164
http://www.unc.edu/~adamsonj

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Re: Loading a module from the current-working-directory

[Thien-Thi Nguyen]

() Joel James Adamson <adamsonj@email.unc.edu>
() Wed, 21 Jul 2010 16:27:54 -0400

   (define-module (popgen popgen))

   [...]

   guile> (set! %load-path (cons (getcwd) %load-path))
   guile> (use-modules (popgen popgen))

   [...]
   <unnamed port>: no code for module (popgen popgen)
   ABORT: (misc-error)

   Where am I going wrong?

For module name ‘(a b c)’, guile constructs relative filenames:

 a/b/c.scm  (S: scheme)
 a/b/c      (R: raw)

and searches for the file DIR/S and DIR/R for each DIR in ‘%load-path’
(see variable ‘%load-extensions’).  In this case,

 (a b  ) ≘ (popgen       )        ; module name prefix
      c  ≘         popgen         ; module name leaf

The error you see means that none of these files can be found:

 /home/joel/Documents/ss_theory/scm/popgen/popgen.scm
 /home/joel/Documents/ss_theory/scm/popgen/popgen
 /usr/share/guile/site/popgen/popgen.scm
 /usr/share/guile/site/popgen/popgen
 /usr/share/guile/1.8/popgen/popgen.scm
 /usr/share/guile/1.8/popgen/popgen
 /usr/share/guile/popgen/popgen.scm
 /usr/share/guile/popgen/popgen

Absent a way to associate a module name to a filesystem directory
in ‘%load-path’ in Scheme (e.g., module catalogs in Guile 1.4.x),
a common workaround is to implement an alias in the filesystem:

 ln -s /home/joel/Documents/ss_theory/scm popgen

This approach works here because the module name prefix has length 1.
Another way is to avoid having a prefix in the module name, but that's
probably not a good idea if the module is intended for installation.
Yet another way is to call ‘primitive-load’ prior to ‘use-modules’,
but that's somewhat ugly.

thi

Re: Loading a module from the current-working-directory

[Joel James Adamson]

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Thien-Thi Nguyen <ttn@gnuvola.org> writes:

> () Joel James Adamson <adamsonj@email.unc.edu>
> () Wed, 21 Jul 2010 16:27:54 -0400
>
>    (define-module (popgen popgen))
>
>    [...]
>
>    guile> (set! %load-path (cons (getcwd) %load-path))
>    guile> (use-modules (popgen popgen))
>
>    [...]
>    <unnamed port>: no code for module (popgen popgen)
>    ABORT: (misc-error)
>
>    Where am I going wrong?
>
> For module name ‘(a b c)’, guile constructs relative filenames:
>
>  a/b/c.scm  (S: scheme)
>  a/b/c      (R: raw)
>
> and searches for the file DIR/S and DIR/R for each DIR in ‘%load-path’
> (see variable ‘%load-extensions’).  In this case,
>
>  (a b  ) ≘ (popgen       )        ; module name prefix
>       c  ≘         popgen         ; module name leaf
>
> The error you see means that none of these files can be found:
>
>  /home/joel/Documents/ss_theory/scm/popgen/popgen.scm
>  /home/joel/Documents/ss_theory/scm/popgen/popgen

Thanks, I have updated my filesystem hierarchy to reflect the module
hierarchy.

Joel

-- 
Joel J. Adamson
Servedio Lab
University of North Carolina at Chapel Hill

FSF Member #8164
http://www.unc.edu/~adamsonj

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