Re: Debian guile-1.8 and ttn guile-pg

[David Pirotte <david@altosw.be>]

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Hi Thien,

Symbols need to be exported.

Here is [attached] an exemple of the actual guile-pg 0.16-4 
postgres.scm file from the latest debian package.

The exports are done after the load-extension, but I am convinced it 
could be done in the define-module #:export clause, could it not?

David

Le Tue, 27 May 2008 15:04:27 +0200,
Thien-Thi Nguyen <ttn@gnuvola.org> a écrit :

> ⎛⎞ Greg Troxel <gdt@ir.bbn.com>
> ⎝⎠ Tue, 27 May 2008 08:46:04 -0400
> 
>    > (define-module (database postgres))
>    > (load-extension "/ABS/PATH/TO/libpostgres.so.0.0.0"
>    >                 "scm_init_database_postgres_module")
> 
>    (I presume you are either consing up the path or substituting
>    it with autoconf.)
> 
> Yes, either way or even both (whatever will work).
> 
>    My understanding is slightly fuzzy, but I think that defines
>    the guile-pg symbols in the (database postgres) module, but
>    will not necessarily export them.
> 
> OK.
> 
>    The 1.4-style module loading seems to do the equivalent of
>    define-public.
> 
> Yes.
> 
>    I did make guile-pg work with a scheme load file as you write
>    above once, and I also had a number of export statements.
> 
> So in addition to the above, there needs to be `define-public'
> for each proc?  Can that be phrased as an `#:export' clause in
> the `define-module' form (prior to the `load-extension' call)?
> 
> thi
> 
> 

[-- Attachment #2: postgres.scm --]
[-- Type: text/x-scheme, Size: 3594 bytes --]

;;; postgres.scm --- wrap PostgreSQL libpq

;;    Guile-pg - A Guile interface to PostgreSQL
;;    Copyright (C) 1999,2000,2002,2003 Free Software Foundation, Inc.
;;
;;    This program is free software; you can redistribute it and/or modify
;;    it under the terms of the GNU General Public License as published by
;;    the Free Software Foundation; either version 2 of the License, or
;;    (at your option) any later version.
;;
;;    This program is distributed in the hope that it will be useful,
;;    but WITHOUT ANY WARRANTY; without even the implied warranty of
;;    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;    GNU General Public License for more details.
;;
;;    You should have received a copy of the GNU General Public License
;;    along with this program; if not, write to the Free Software
;;    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

;;    Author: Ian Grant <Ian.Grant@cl.cam.ac.uk>

;; Load the C interface functions

(define-module (database postgres))

(cond
 ;; maybe this is already done
 ((and (defined? 'pg-guile-pg-loaded) pg-guile-pg-loaded))
 ;; use app-module loader if there
 ((defined? 'make-app-module-loader)
  ((make-app-module-loader
    (lambda (name)
      (car (list
            `("~A/guile-pg/0.16" ,(assq-ref %guile-build-info 'libdir)))))
    (lambda (name)
      `("lib~A" ,name))
    (lambda (name)
      `("init_~A" ,name)))
   "postgres"))
 ;; primitive way
 (else (dynamic-call
        "init_postgres"
        (dynamic-link
         (car (list
               (format #f "~A/guile-pg/0.16/libpostgres.so"
                       (assq-ref %guile-build-info 'libdir))))))))

(export pg-guile-pg-loaded)             ; ugh

(export pg-connectdb)
(export pg-connection?)
(export pg-setdb)
(export pg-reset)
(export pg-get-client-data)
(export pg-set-client-data!)
(export pg-exec)
(export pg-result?)
(export pg-error-message)
(export pg-get-db)
(export pg-get-user)
(export pg-get-pass)
(export pg-get-host)
(export pg-get-port)
(export pg-get-tty)
(export pg-get-options)
(export pg-get-connection)
(export pg-backend-pid)
(export pg-result-status)
(export pg-ntuples)
(export pg-nfields)
(export pg-cmdtuples)
(export pg-oid-status)
(export pg-oid-value)
(export pg-fname)
(export pg-fnumber)
(export pg-ftype)
(export pg-fsize)
(export pg-getvalue)
(export pg-getlength)
(export pg-getisnull)
(export pg-binary-tuples?)
(export pg-fmod)
(export pg-guile-pg-version)
(export pg-getline)
(export pg-putline)
(export pg-endcopy)
(export pg-trace)
(export pg-untrace)

(export pg-make-print-options)
(export pg-print)

(export pg-lo-creat)
(export pg-lo-open)
(export pg-lo-unlink)
(export pg-lo-get-connection)
(export pg-lo-get-oid)
(export pg-lo-tell)
(export pg-lo-seek)
(export pg-lo-read)
(export pg-lo-import)
(export pg-lo-export)

(define-public (pg-guile-pg-module-config-stamp) "Mon Feb 25 11:12:05 EST 2008")
(define-public (pg-guile-pg-module-version) "0.16")

;; backward compatibility (not documented to encourage
;;                         usage of symbols in new code)
;;
;; WARNING: these will go away!

(define-public PGRES_EMPTY_QUERY    'PGRES_EMPTY_QUERY)
(define-public PGRES_COMMAND_OK     'PGRES_COMMAND_OK)
(define-public PGRES_TUPLES_OK      'PGRES_TUPLES_OK)
(define-public PGRES_COPY_OUT       'PGRES_COPY_OUT)
(define-public PGRES_COPY_IN        'PGRES_COPY_IN)
(define-public PGRES_BAD_RESPONSE   'PGRES_BAD_RESPONSE)
(define-public PGRES_NONFATAL_ERROR 'PGRES_NONFATAL_ERROR)
(define-public PGRES_FATAL_ERROR    'PGRES_FATAL_ERROR)

;;; postgres.scm ends here