misc/fuel/fuel-autodoc.el

   1 ;;; fuel-autodoc.el -- doc snippets in the echo area
   2
   3 ;; Copyright (C) 2008, 2009 Jose Antonio Ortega Ruiz
   4 ;; See http://factorcode.org/license.txt for BSD license.
   5
   6 ;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
   7 ;; Keywords: languages, fuel, factor
   8 ;; Start date: Sat Dec 20, 2008 00:50
   9
  10 ;;; Comentary:
  11
  12 ;; Utilities for displaying information automatically in the echo
  13 ;; area.
  14
  15 ;;; Code:
  16
  17 (require 'fuel-eval)
  18 (require 'fuel-font-lock)
  19 (require 'fuel-syntax)
  20 (require 'fuel-base)
  21
  22 \f
  23 ;;; Customization:
  24
  25 (defgroup fuel-autodoc nil
  26   "Options controlling FUEL's autodoc system."
  27   :group 'fuel)
  28
  29 (defcustom fuel-autodoc-minibuffer-font-lock t
  30   "Whether to use font lock for info messages in the minibuffer."
  31   :group 'fuel-autodoc
  32   :type 'boolean)
  33
  34
  35 \f
  36 ;;; Eldoc function:
  37
  38 (defvar fuel-autodoc--timeout 200)
  39
  40 (defun fuel-autodoc--word-synopsis (&optional word)
  41   (let ((word (or word (fuel-syntax-symbol-at-point)))
  42         (fuel-log--inhibit-p t))
  43     (when word
  44       (let* ((cmd (if (fuel-syntax--in-using)
  45                       `(:fuel* (,word fuel-vocab-summary) :in t)
  46                     `(:fuel* (((:quote ,word) synopsis :get)) :in)))
  47              (ret (fuel-eval--send/wait cmd fuel-autodoc--timeout))
  48              (res (fuel-eval--retort-result ret)))
  49         (when (and ret (not (fuel-eval--retort-error ret)) (stringp res))
  50           (if fuel-autodoc-minibuffer-font-lock
  51               (fuel-font-lock--factor-str res)
  52             res))))))
  53
  54 (make-variable-buffer-local
  55  (defvar fuel-autodoc--fallback-function nil))
  56
  57 (defun fuel-autodoc--eldoc-function ()
  58   (or (and fuel-autodoc--fallback-function
  59            (funcall fuel-autodoc--fallback-function))
  60       (condition-case e
  61           (fuel-autodoc--word-synopsis)
  62         (error (format "Autodoc not available (%s)"
  63                        (error-message-string e))))))
  64
  65 \f
  66 ;;; Autodoc mode:
  67
  68 (make-variable-buffer-local
  69  (defvar fuel-autodoc-mode-string " A"
  70    "Modeline indicator for fuel-autodoc-mode"))
  71
  72 (define-minor-mode fuel-autodoc-mode
  73   "Toggle Fuel's Autodoc mode.
  74 With no argument, this command toggles the mode.
  75 Non-null prefix argument turns on the mode.
  76 Null prefix argument turns off the mode.
  77
  78 When Autodoc mode is enabled, a synopsis of the word at point is
  79 displayed in the minibuffer."
  80   :init-value nil
  81   :lighter fuel-autodoc-mode-string
  82   :group 'fuel-autodoc
  83
  84   (set (make-local-variable 'eldoc-documentation-function)
  85        (when fuel-autodoc-mode 'fuel-autodoc--eldoc-function))
  86   (set (make-local-variable 'eldoc-minor-mode-string) nil)
  87   (eldoc-mode fuel-autodoc-mode)
  88   (message "Fuel Autodoc %s" (if fuel-autodoc-mode "enabled" "disabled")))
  89
  90 \f
  91 (provide 'fuel-autodoc)
  92 ;;; fuel-autodoc.el ends here