--- /dev/null
+#!/bin/sh
+# aside from this initial boilerplate, this is actually -*- scheme -*- code
+main='(module-ref (resolve-module '\''(scripts snarf-guile-m4-docs)) '\'main')'
+exec ${GUILE-guile} -l $0 -c "(apply $main (cdr (command-line)))" "$@"
+!#
+;;; snarf-guile-m4-docs --- Parse guile.m4 comments for texi documentation
+
+;; Copyright (C) 2002, 2006 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., 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 (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