#!/bin/sh
exec ${GUILE-/usr/bin/guile} -e '(scripts generate-autoload)' -s $0 "$@" # -*- scheme -*-
!#
;;; generate-autoload --- Display define-module form with autoload info

;; 	Copyright (C) 2001,2003 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, 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 software; see the file COPYING.  If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
;; Boston, MA 02111-1307 USA
;;
;; As a special exception, the Free Software Foundation gives permission
;; for additional uses of the text contained in its release of GUILE.
;;
;; The exception is that, if you link the GUILE library with other files
;; to produce an executable, this does not by itself cause the
;; resulting executable to be covered by the GNU General Public License.
;; Your use of that executable is in no way restricted on account of
;; linking the GUILE library code into it.
;;
;; This exception does not however invalidate any other reasons why
;; the executable file might be covered by the GNU General Public License.
;;
;; This exception applies only to the code released by the
;; Free Software Foundation under the name GUILE.  If you copy
;; code from other Free Software Foundation releases into a copy of
;; GUILE, as the General Public License permits, the exception does
;; not apply to the code that you add in this way.  To avoid misleading
;; anyone as to the status of such modified files, you must delete
;; this exception notice from them.
;;
;; If you write modifications of your own for GUILE, it is your choice
;; whether to permit this exception to apply to your modifications.
;; If you do not wish that, delete this exception notice.

;;; Author: Thien-Thi Nguyen <ttn@gnu.org>

;;; Commentary:

;; Usage: generate-autoload [OPTIONS] FILE1 FILE2 ...
;;
;; The autoload form is displayed to standard output:
;;
;; (define-module (guile-user)
;;   :autoload (ZAR FOO) (FOO-1 FOO-2 ...)
;;     :
;;     :
;;   :autoload (ZAR BAR) (BAR-1 BAR-2 ...))
;;
;; For each file, a symbol triggers an autoload if it is found in one
;; of these situations:
;;  - in the `:export' clause of a `define-module' form
;;  - in a top-level `export' or `export-syntax' form
;;  - in a `define-public' form
;;  - in a `defmacro-public' form
;;
;; The module name is inferred from the `define-module' form.  If either the
;; module name or the exports list cannot be determined, no autoload entry is
;; generated for that file.
;;
;; Options:
;; --target MODULE-NAME         -- Use MODULE-NAME instead of `(guile-user)'.
;;                                 Note that some shells may require you to
;;                                 quote the argument to handle parentheses
;;                                 and spaces.
;;
;;
;; Usage examples from Scheme code as a module:
;; (use-modules (scripts generate-autoload))
;; (generate-autoload "generate-autoload")
;; (generate-autoload "--target" "(my module)" "generate-autoload")
;; (apply generate-autoload "--target" "(my module)" '("foo" "bar" "baz"))
;;
;;
;; TODO: rewrite to use read-scheme-source
;;       add --cookie option (look for them in comments, like emacs)
;;       add ability to configure source type selection

;;; Code:

(define-module (scripts generate-autoload)
  :autoload (scripts PROGRAM) (HVQC-MAIN)
  :export (generate-autoload))

(define (autoload-info file)
  (let ((p (open-input-file file)))
    (let loop ((form (read p)) (module-name #f) (exports '()))
      (if (eof-object? form)
          (begin
            (close-port p)
            (and module-name
                 (not (null? exports))
                 (list module-name exports))) ; ret
          (cond ((and (list? form)
                      (< 1 (length form))
                      (eq? 'define-module (car form)))
                 (loop (read p)
                       (cadr form)
                       (cond ((member ':export form)
                              => (lambda (val)
                                   (append (cadr val) exports)))
                             (else exports))))
                ((and (list? form)
                      (< 1 (length form))
                      (memq (car form) '(export export-syntax)))
                 (loop (read p)
                       module-name
                       (append (cdr form) exports)))
                ((and (list? form)
                      (< 2 (length form))
                      (eq? 'define-public (car form))
                      (list? (cadr form))
                      (symbol? (caadr form)))
                 (loop (read p)
                       module-name
                       (cons (caadr form) exports)))
                ((and (list? form)
                      (< 2 (length form))
                      (eq? 'define-public (car form))
                      (symbol? (cadr form)))
                 (loop (read p)
                       module-name
                       (cons (cadr form) exports)))
                ((and (list? form)
                      (< 3 (length form))
                      (eq? 'defmacro-public (car form))
                      (symbol? (cadr form)))
                 (loop (read p)
                       module-name
                       (cons (cadr form) exports)))
                (else (loop (read p) module-name exports)))))))

(define (generate-autoload . args)
  (let* ((module-count 0)
         (syms-count 0)
         (target-override (cond ((member "--target" args) => cadr)
                                (else #f)))
         (files (if target-override (cddr args) args)))
    (display ";;; do not edit --- generated ")
    (display (strftime "%Y-%m-%d %H:%M:%S" (localtime (current-time))))
    (newline)
    (display "(define-module ")
    (display (or target-override "(guile-user)"))
    (for-each (lambda (file)
                (cond ((autoload-info file)
                       => (lambda (info)
                            (apply (lambda (module-name exports)
                                     (set! module-count (1+ module-count))
                                     (set! syms-count (+ (length exports)
                                                         syms-count))
                                     (for-each display
                                               (list "\n  :autoload "
                                                     module-name " "
                                                     exports)))
                                   info)))))
              files)
    (display ")")
    (newline)
    (for-each display (list "  ;;; "
                            syms-count " symbols in "
                            module-count " modules\n"))))

(define (main args)
  (HVQC-MAIN args (lambda (args)
                    (apply generate-autoload (cdr args)))
             '(usage . commentary)
             '(package . "Guile")))

;;; generate-autoload ends here
