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+;; introspection.scm -- name says it all
+
+;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
+
+;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
+;; Start date: Sun Feb 08, 2009 18:44
+
+;; 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/>.
+
+;;; Comentary:
+
+;; Procedures introspecting on scheme objects and their properties.
+
+;;; Code:
+
+(define-module (geiser introspection)
+ #:export (proc-args completions)
+ #:use-module (system vm program)
+ #:use-module (ice-9 session)
+ #:use-module (srfi srfi-1))
+
+(define (proc-args proc)
+ (let ((proc (and (symbol? proc)
+ (module-bound? (current-module) proc)
+ (eval proc (current-module)))))
+ (cond ((not proc) #f)
+ ((program? proc) (program-args proc))
+ ((procedure? proc) (procedure-args proc))
+ ((macro? proc) (macro-args proc))
+ (else #f))))
+
+(define (program-args program)
+ (let* ((arity (program-arity program))
+ (arg-no (first arity))
+ (opt (> (second arity) 0))
+ (args (map first (take (program-bindings program) arg-no))))
+ (format-args (if opt (drop-right args 1) args)
+ (and opt (last args))
+ (program-module program))))
+
+(define (procedure-args proc)
+ (let* ((arity (procedure-property proc 'arity))
+ (req (first arity))
+ (opt (third arity))
+ (env (procedure-environment proc)))
+ (format-args (map (lambda (n)
+ (string->symbol (format "arg~A" (+ 1 n))))
+ (iota req))
+ (and opt 'rest)
+ (and (not (null? env)) env))))
+
+(define (macro-args macro)
+ (let ((prog (macro-transformer macro)))
+ (if prog
+ (program-args prog)
+ (format-args '(...) #f #f))))
+
+(define (format-args args opt module)
+ (list (cons 'required args)
+ (cons 'optional (or opt '()))
+ (cons 'module (if module (module-name module) '()))))
+
+(define (completions prefix)
+ (sort! (map symbol->string
+ (apropos-internal (string-append "^" prefix)))
+ string<?))
+
+;;; introspection.scm ends here