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;; geiser-autodoc.el -- autodoc mode
;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
;; Start date: Sun Feb 08, 2009 19:44
;; 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:
;; A minor mode that echoes information about procedures and variables
;; near point at the minibuffer.
;;; Code:
(require 'geiser-eval)
(require 'geiser-syntax)
(require 'geiser-base)
(require 'eldoc)
;;; Customization:
(defgroup geiser-autodoc nil
"Options for displaying autodoc strings in the echo area."
:group 'geiser)
(defface geiser-font-lock-autodoc-current-arg
'((t (:background unspecified :foreground "red" :bold t)))
"Face for highlighting current argument in autodoc messages."
:group 'faces
:group 'geiser-faces
:group 'geiser-autodoc)
(defcustom geiser-autodoc-delay 0.2
"Delay before autodoc messages are fetched and displayed, in seconds."
:type 'number
:group 'geiser-autodoc)
;;; Procedure arguments:
(make-variable-buffer-local
(defvar geiser-autodoc--last nil))
(defun geiser-autodoc--function-args (fun)
(if (eq fun (car geiser-autodoc--last))
(cdr geiser-autodoc--last)
(let* ((cmd `(:gs ((:ge proc-args) ',fun)))
(result (geiser-eval--retort-result (geiser-eval--send/wait cmd))))
(when (not (listp result)) (setq result 'undefined))
(setq geiser-autodoc--last (cons fun result))
result)))
(defun geiser-autodoc--insert (sym current pos)
(let ((str (format "%s" sym)))
(when (= current pos)
(put-text-property 0 (length str) 'face 'geiser-font-lock-autodoc-current-arg str))
(insert str)))
(defun geiser-autodoc--fun-args-str (fun args pos)
(save-current-buffer
(set-buffer (geiser-syntax--font-lock-buffer))
(erase-buffer)
(let ((current 0))
(insert "(")
(geiser-autodoc--insert fun current pos)
(dolist (arg (cdr (assoc 'required args)))
(setq current (1+ current))
(insert " ")
(geiser-autodoc--insert arg current pos))
(setq current (1+ current))
(when (cdr (assoc 'optional args))
(when (> pos current) (setq current pos))
(insert " . ")
(geiser-autodoc--insert (cdr (assoc 'optional args)) current pos))
(insert ")")
(buffer-string))))
;;; Autodoc function:
(defun geiser-autodoc--eldoc-function ()
(let* ((f/a (geiser-syntax--enclosing-form-data))
(fun (car f/a))
(arg-no (cdr f/a)))
(when fun
(let ((args (geiser-autodoc--function-args fun)))
(when (listp args)
(geiser-autodoc--fun-args-str fun args arg-no))))))
;;; Autodoc mode:
(make-variable-buffer-local
(defvar geiser-autodoc-mode-string " A"
"Modeline indicator for geiser-autodoc-mode"))
(define-minor-mode geiser-autodoc-mode
"Toggle Geiser's Autodoc mode.
With no argument, this command toggles the mode.
Non-null prefix argument turns on the mode.
Null prefix argument turns off the mode.
When Autodoc mode is enabled, a synopsis of the word at point is
displayed in the minibuffer."
:init-value nil
:lighter geiser-autodoc-mode-string
:group 'geiser-autodoc
(set (make-local-variable 'eldoc-documentation-function)
(when geiser-autodoc-mode 'geiser-autodoc--eldoc-function))
(set (make-local-variable 'eldoc-minor-mode-string) nil)
(set (make-local-variable 'eldoc-idle-delay) geiser-autodoc-delay)
(eldoc-mode geiser-autodoc-mode)
(message "Geiser Autodoc %s" (if geiser-autodoc-mode "enabled" "disabled")))
(provide 'geiser-autodoc)
;;; geiser-autodoc.el ends here
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