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+;; autodoc.ss -- support for autodoc
+
+;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
+
+;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
+;; Start date: Sun May 03, 2009 14:45
+
+;; This file 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 3 of the License, or
+;; (at your option) any later version.
+
+;; This file 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 program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Code:
+
+#lang scheme
+
+(provide autodoc update-module-cache)
+
+(require geiser/utils geiser/locations)
+
+(define (autodoc form)
+  (cond ((null? form) #f)
+        ((symbol? form) (describe-application (list form)))
+        ((not (pair? form)) #f)
+        ((not (list? form)) (autodoc (pair->list form)))
+        ((define-head? form) => autodoc)
+        (else (autodoc/list form))))
+
+(define (autodoc/list form)
+  (let ((lst (last form)))
+    (cond ((and (symbol? lst) (describe-application (list lst))))
+          ((and (pair? lst) (not (memq (car lst) '(quote))) (autodoc lst)))
+          (else (describe-application form)))))
+
+(define (define-head? form)
+  (define defforms '(-define
+                     define define-values
+                     define-method define-class define-generic define-struct
+                     define-syntax define-syntaxes -define-syntax))
+  (and (= 2 (length form))
+       (memq (car form) defforms)
+       (car form)))
+
+(define (describe-application form)
+  (let* ((fun (car form))
+         (loc (symbol-location* fun))
+         (name (car loc))
+         (path (cdr loc))
+         (sgn (and path (signature path name fun))))
+    (and sgn
+         (list (cons 'signature (cons fun sgn))
+               (cons 'position 0)
+               (cons 'module (module-path-name->name path))))))
+
+(define signatures (make-hash))
+
+(define (signature path name local-name)
+  (let ((path (if (path? path) (path->string path) path)))
+    (hash-ref! (hash-ref! signatures
+                          path
+                          (lambda () (parse-signatures path)))
+               name
+               (lambda () (infer-signature local-name)))))
+
+(define (parse-signatures path)
+  (let ((result (make-hasheq)))
+    (with-handlers ((exn? (lambda (e) result)))
+      (with-input-from-file path
+        (lambda ()
+          (parameterize ((read-accept-reader #t))
+            (let loop ((stx (read-syntax path)))
+              (cond ((eof-object? stx) void)
+                    ((syntax->datum stx) =>
+                     (lambda (datum)
+                       (parse-datum! datum result)
+                       (loop (read-syntax path))))
+                    (else void)))))))
+    result))
+
+(define (parse-datum! datum store)
+  (match datum
+    ((list 'module name lang forms ...)
+     (for-each (lambda (f) (parse-datum! f store)) forms))
+    ((list 'define (list name formals ...) body ...)
+     (add-signature! name formals store))
+    ((list 'define name (list 'lambda formals body ...))
+     (add-signature! name formals store))
+    (_ void)))
+
+(define (add-signature! name formals store)
+  (hash-set! store name (parse-formals formals)))
+
+(define (parse-formals formals)
+  (let loop ((formals formals) (req '()) (opt '()) (keys '()))
+    (cond ((null? formals) (make-signature req opt keys #f))
+          ((symbol? formals) (make-signature req opt keys formals))
+          ((pair? (car formals)) (loop (cdr formals)
+                                       req
+                                       (cons (car formals) opt)
+                                       keys))
+          ((keyword? (car formals)) (let* ((kname (keyword->symbol (car formals)))
+                                           (arg-id (cadr formals))
+                                           (name (if (pair? arg-id)
+                                                     (list kname (cadr arg-id))
+                                                     kname)))
+                                      (loop (cddr formals)
+                                            req
+                                            opt
+                                            (cons name keys))))
+          (else (loop (cdr formals) (cons (car formals) req) opt keys)))))
+
+(define (make-signature req opt keys rest)
+  `(,@(reverse req)
+    ,@(if (null? opt) opt
+          (cons '#:opt (reverse opt)))
+    ,@(if (null? keys) keys
+          (cons '#:key (reverse keys)))
+    ,@(if rest (list '#:rest rest) '())))
+
+(define (update-module-cache path . form)
+  (when (and (string? path)
+             (or (null? form)
+                 (and (list? (car form))
+                      (not (null? (car form)))
+                      (memq (caar form) '(define)))))
+    (hash-remove! signatures path)))
+
+(define (infer-signature name)
+  (let ((value (namespace-variable-value name (lambda () #f))))
+    (and (procedure? value)
+         (arity->signature (procedure-arity value)))))
+
+(define (arity->signature arity)
+  (cond ((number? arity)
+         (make-signature (gen-arg-names 1 arity) '() '() #f))
+        ((arity-at-least? arity)
+         (make-signature (gen-arg-names 1 (arity-at-least-value arity))
+                         '() '() 'rest))
+        (else
+         (let ((arg (map (lambda (a)
+                           (if (number? a) a (list (arity-at-least-value a) '...)))
+                         arity)))
+           (make-signature (list arg) '() '() #f)))))
+
+(define (gen-arg-names fst count)
+  (let* ((letts (list->vector '(#\x #\y #\z #\u #\v #\w #\t)))
+         (len (vector-length letts))
+         (lett (lambda (n) (vector-ref letts (modulo n len)))))
+    (reverse (map (lambda (n) (string->symbol (format "~a" (lett (- n 1)))))
+                  (build-list (max count 1) (lambda (n) (+ n fst)))))))
+
+;;; autodoc.ss ends here