;;; display-commentary --- As advertized

;; 	Copyright (C) 2001, 2006, 2011 Free Software Foundation, Inc.
;;
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU Lesser General Public License
;; as published by the Free Software Foundation; either version 3, 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
;; Lesser General Public License for more details.
;;
;; You should have received a copy of the GNU Lesser General Public
;; License along with this software; see the file COPYING.LESSER.  If
;; not, write to the Free Software Foundation, Inc., 51 Franklin
;; Street, Fifth Floor, Boston, MA 02110-1301 USA

;;; Author: Thien-Thi Nguyen

;;; Commentary:

;; Usage: display-commentary REF1 REF2 ...
;;
;; Display Commentary section from REF1, REF2 and so on.
;; Each REF may be a filename or module name (list of symbols).
;; In the latter case, a filename is computed by searching `%load-path'.

;;; Code:

(define-module (scripts display-commentary)
  :use-module (ice-9 documentation)
  :export (display-commentary))

(define %summary "Display the Commentary section from a file or module.")

(define (display-commentary-one file)
  (format #t "~A commentary:\n~A" file (file-commentary file)))

(define (module-name->filename-frag ls) ; todo: export or move
  (let ((ls (map symbol->string ls)))
    (let loop ((ls (cdr ls)) (acc (car ls)))
      (if (null? ls)
          acc
          (loop (cdr ls) (string-append acc "/" (car ls)))))))

(define (display-module-commentary module-name)
  (cond ((%search-load-path (module-name->filename-frag module-name))
         => (lambda (file)
              (format #t "module ~A\n" module-name)
              (display-commentary-one file)))))

(define (display-commentary . refs)
  (for-each (lambda (ref)
              (cond ((string? ref)
                     (if (equal? 0 (string-index ref #\())
                         (display-module-commentary
                          (with-input-from-string ref read))
                         (display-commentary-one ref)))
                    ((list? ref)
                     (display-module-commentary ref))))
            refs))

(define main display-commentary)

;;; display-commentary ends here