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;;; snarf-guile-m4-docs --- Parse guile.m4 comments for texi documentation
;; Copyright (C) 2002, 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 <ttn@gnu.org>
;;; Commentary:
;; Usage: snarf-guile-m4-docs FILE
;;
;; Grep FILE for comments preceding macro definitions, massage
;; them into valid texi, and display to stdout. For each comment,
;; lines preceding "^# Usage:" are discarded.
;;
;; TODO: Generalize.
;;; Code:
(define-module (scripts snarf-guile-m4-docs)
:use-module (ice-9 rdelim)
:export (snarf-guile-m4-docs))
(define %include-in-guild-list #f)
(define %summary "Snarf out texinfo documentation from .m4 files.")
(define (display-texi lines)
(display "@deffn {Autoconf Macro}")
(for-each (lambda (line)
(display (cond ((and (>= (string-length line) 2)
(string=? "# " (substring line 0 2)))
(substring line 2))
((string=? "#" (substring line 0 1))
(substring line 1))
(else line)))
(newline))
lines)
(display "@end deffn")
(newline) (newline))
(define (prefix? line sub)
(false-if-exception
(string=? sub (substring line 0 (string-length sub)))))
(define (massage-usage line)
(let loop ((line (string->list line)) (acc '()))
(if (null? line)
(list (list->string (reverse acc)))
(loop (cdr line)
(cons (case (car line)
((#\( #\) #\,) #\space)
(else (car line)))
acc)))))
(define (snarf-guile-m4-docs . args)
(let* ((p (open-file (car args) "r"))
(next (lambda () (read-line p))))
(let loop ((line (next)) (acc #f))
(or (eof-object? line)
(cond ((prefix? line "# Usage:")
(loop (next) (massage-usage (substring line 8))))
((prefix? line "AC_DEFUN")
(display-texi (reverse acc))
(loop (next) #f))
((and acc (prefix? line "#"))
(loop (next) (cons line acc)))
(else
(loop (next) #f)))))))
(define main snarf-guile-m4-docs)
;;; snarf-guile-m4-docs ends here
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