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+;;; use2dot --- Display module dependencies as a DOT specification
+
+;; 	Copyright (C) 2001, 2006 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: use2dot [OPTIONS] [FILE ...]
+;; Display to stdout a DOT specification that describes module dependencies
+;; in FILEs.
+;;
+;; A top-level `use-modules' form or a `:use-module' `define-module'-component
+;; results in a "solid" style edge.
+;;
+;; An `:autoload' `define-module'-component results in a "dotted" style edge
+;; with label "N" indicating that N names are responsible for triggering the
+;; autoload.  [The "N" label is not implemented.]
+;;
+;; A top-level `load' or `primitive-load' form results in a a "bold" style
+;; edge to a node named with either the file name if the `load' argument is a
+;; string, or "[computed in FILE]" otherwise.
+;;
+;; Options:
+;;  -m, --default-module MOD -- Set MOD as the default module (for top-level
+;;                              `use-modules' forms that do not follow some
+;;                              `define-module' form in a file).  MOD should be
+;;                              be a list or `#f', in which case such top-level
+;;                              `use-modules' forms are effectively ignored.
+;;                              Default value: `(guile-user)'.
+
+;;; Code:
+
+(define-module (scripts use2dot)
+  :autoload (ice-9 getopt-long) (getopt-long)
+  :use-module ((srfi srfi-13) :select (string-join))
+  :use-module ((scripts frisk)
+               :select (make-frisker edge-type edge-up edge-down))
+  :export (use2dot))
+
+(define *default-module* '(guile-user))
+
+(define (q s)                           ; quote
+  (format #f "~S" s))
+
+(define (vv pairs)                      ; => ("var=val" ...)
+  (map (lambda (pair)
+         (format #f "~A=~A" (car pair) (cdr pair)))
+       pairs))
+
+(define (>>header)
+  (format #t "digraph use2dot {\n")
+  (for-each (lambda (s) (format #t "  ~A;\n" s))
+            (vv `((label . ,(q "Guile Module Dependencies"))
+                  ;;(rankdir . LR)
+                  ;;(size . ,(q "7.5,10"))
+                  (ratio . fill)
+                  ;;(nodesep . ,(q "0.05"))
+                  ))))
+
+(define (>>body edges)
+  (for-each
+   (lambda (edge)
+     (format #t "  \"~A\" -> \"~A\"" (edge-down edge) (edge-up edge))
+     (cond ((case (edge-type edge)
+              ((autoload) '((style . dotted) (fontsize . 5)))
+              ((computed) '((style . bold)))
+              (else #f))
+            => (lambda (etc)
+                 (format #t " [~A]" (string-join (vv etc) ",")))))
+     (format #t ";\n"))
+   edges))
+
+(define (>>footer)
+  (format #t "}"))
+
+(define (>> edges)
+  (>>header)
+  (>>body edges)
+  (>>footer))
+
+(define (use2dot . args)
+  (let* ((parsed-args (getopt-long (cons "use2dot" args)    ;;; kludge
+                                   '((default-module
+                                       (single-char #\m) (value #t)))))
+         (=m (option-ref parsed-args 'default-module *default-module*))
+         (scan (make-frisker `(default-module . ,=m)))
+         (files (option-ref parsed-args '() '())))
+    (>> (reverse ((scan files) 'edges)))))
+
+(define main use2dot)
+
+;;; use2dot ends here