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22
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1 ;;; eldoc.el --- show function arglist or variable docstring in echo area
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2
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3 ;; Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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4
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5 ;; Author: Noah Friedman <friedman@prep.ai.mit.edu>
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6 ;; Maintainer: friedman@prep.ai.mit.edu
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7 ;; Keywords: extensions
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8 ;; Created: 1995-10-06
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9
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10 ;; $Id: eldoc.el,v 1.1 1997/02/14 20:00:10 steve Exp $
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11
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12 ;; This file is part of GNU Emacs.
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13
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14 ;; GNU Emacs is free software; you can redistribute it and/or modify
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15 ;; it under the terms of the GNU General Public License as published by
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16 ;; the Free Software Foundation; either version 2, or (at your option)
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17 ;; any later version.
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18
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19 ;; GNU Emacs is distributed in the hope that it will be useful,
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20 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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22 ;; GNU General Public License for more details.
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23
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24 ;; You should have received a copy of the GNU General Public License
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25 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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26 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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27 ;; Boston, MA 02111-1307, USA.
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28
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29 ;;; Commentary:
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30
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31 ;; This program was inspired by the behavior of the "mouse documentation
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32 ;; window" on many Lisp Machine systems; as you type a function's symbol
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33 ;; name as part of a sexp, it will print the argument list for that
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34 ;; function. Behavior is not identical; for example, you need not actually
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35 ;; type the function name, you need only move point around in a sexp that
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36 ;; calls it. Also, if point is over a documented variable, it will print
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37 ;; the one-line documentation for that variable instead, to remind you of
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38 ;; that variable's meaning.
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39
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40 ;; One useful way to enable this minor mode is to put the following in your
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41 ;; .emacs:
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42 ;;
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43 ;; (autoload 'turn-on-eldoc-mode "eldoc" nil t)
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44 ;; (add-hook 'emacs-lisp-mode-hook 'turn-on-eldoc-mode)
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45 ;; (add-hook 'lisp-interaction-mode-hook 'turn-on-eldoc-mode)
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46
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47 ;;; Code:
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48
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49 ;; Use idle timers if available in the version of emacs running.
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50 ;; Please don't change this to use `require'; this package works as-is in
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51 ;; XEmacs (which doesn't have timer.el as of 19.14), and I would like to
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52 ;; maintain compatibility with that since I must use it sometimes. --Noah
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53 (or (featurep 'timer)
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54 (load "timer" t))
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55
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56 ;;;###autoload
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57 (defvar eldoc-mode nil
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58 "*If non-nil, show the defined parameters for the elisp function near point.
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59
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60 For the emacs lisp function at the beginning of the sexp which point is
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61 within, show the defined parameters for the function in the echo area.
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62 This information is extracted directly from the function or macro if it is
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63 in pure lisp. If the emacs function is a subr, the parameters are obtained
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64 from the documentation string if possible.
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65
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66 If point is over a documented variable, print that variable's docstring
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67 instead.
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68
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69 This variable is buffer-local.")
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70 (make-variable-buffer-local 'eldoc-mode)
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71
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72 (defconst eldoc-idle-delay 0.50
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73 "*Number of seconds of idle time to wait before printing.
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74 If user input arrives before this interval of time has elapsed after the
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75 last input, no documentation will be printed.
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76
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77 If this variable is set to 0, no idle time is required.")
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78
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79 (defconst eldoc-minor-mode-string " ElDoc"
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80 "*String to display in mode line when Eldoc Mode is enabled.")
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81
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82 ;; Put this minor mode on the global minor-mode-alist.
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83 (or (assq 'eldoc-mode (default-value 'minor-mode-alist))
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84 (setq-default minor-mode-alist
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85 (append (default-value 'minor-mode-alist)
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86 '((eldoc-mode eldoc-minor-mode-string)))))
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87
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88 (defconst eldoc-argument-case 'upcase
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89 "Case to display argument names of functions, as a symbol.
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90 This has two preferred values: `upcase' or `downcase'.
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91 Actually, any name of a function which takes a string as an argument and
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92 returns another string is acceptable.")
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93
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94 (defvar eldoc-message-commands nil
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95 "*Commands after which it is appropriate to print in the echo area.
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96
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97 Eldoc does not try to print function arglists, etc. after just any command,
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98 because some commands print their own messages in the echo area and these
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99 functions would instantly overwrite them. But self-insert-command as well
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100 as most motion commands are good candidates.
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101
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102 This variable contains an obarray of symbols; it is probably best to
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103 manipulate this data structure with the commands `eldoc-add-command' and
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104 `eldoc-remove-command'.")
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105
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106 (cond ((null eldoc-message-commands)
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107 ;; If you increase the number of buckets, keep it a prime number.
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108 (setq eldoc-message-commands (make-vector 31 0))
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109 (let ((list '("self-insert-command"
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110 "next-" "previous-"
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111 "forward-" "backward-"
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112 "beginning-of-" "end-of-"
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113 "goto-"
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114 "recenter"
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115 "scroll-"
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116 "mouse-set-point"))
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117 (syms nil))
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118 (while list
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119 (setq syms (all-completions (car list) obarray 'fboundp))
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120 (setq list (cdr list))
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121 (while syms
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122 (set (intern (car syms) eldoc-message-commands) t)
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123 (setq syms (cdr syms)))))))
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124
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125 ;; Bookkeeping; the car contains the last symbol read from the buffer.
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126 ;; The cdr contains the string last displayed in the echo area, so it can
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127 ;; be printed again if necessary without reconsing.
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128 (defvar eldoc-last-data '(nil . nil))
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129
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130 ;; Idle timers are supported in Emacs 19.31 and later.
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131 (defconst eldoc-use-idle-timer-p (fboundp 'run-with-idle-timer))
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132
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133 ;; eldoc's timer object, if using idle timers
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134 (defvar eldoc-timer nil)
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135
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136 ;; idle time delay currently in use by timer.
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137 ;; This is used to determine if eldoc-idle-delay is changed by the user.
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138 (defvar eldoc-current-idle-delay eldoc-idle-delay)
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139
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140 ;; In emacs 19.29 and later, and XEmacs 19.13 and later, all messages are
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141 ;; recorded in a log. Do not put eldoc messages in that log since
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142 ;; they are Legion.
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143 (defmacro eldoc-message (&rest args)
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144 (if (fboundp 'display-message)
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145 ;; XEmacs 19.13 way of preventing log messages.
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146 (list 'display-message '(quote no-log) (apply 'list 'format args))
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147 (list 'let (list (list 'message-log-max 'nil))
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148 (apply 'list 'message args))))
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149
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150
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151 ;;;###autoload
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152 (defun eldoc-mode (&optional prefix)
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153 "*Enable or disable eldoc mode.
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154 See documentation for the variable of the same name for more details.
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155
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156 If called interactively with no prefix argument, toggle current condition
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157 of the mode.
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158 If called with a positive or negative prefix argument, enable or disable
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159 the mode, respectively."
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160 (interactive "P")
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161
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162 (cond (eldoc-use-idle-timer-p
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163 (add-hook 'post-command-hook 'eldoc-schedule-timer))
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164 (t
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165 ;; Use post-command-idle-hook if defined, otherwise use
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166 ;; post-command-hook. The former is only proper to use in Emacs
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167 ;; 19.30; that is the first version in which it appeared, but it
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168 ;; was obsolesced by idle timers in Emacs 19.31.
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169 (add-hook (if (boundp 'post-command-idle-hook)
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170 'post-command-idle-hook
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171 'post-command-hook)
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172 'eldoc-print-current-symbol-info)))
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173
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174 (setq eldoc-mode (if prefix
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175 (>= (prefix-numeric-value prefix) 0)
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176 (not eldoc-mode)))
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177
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178 (and (interactive-p)
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179 (if eldoc-mode
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180 (message "eldoc-mode is enabled")
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181 (message "eldoc-mode is disabled")))
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182 eldoc-mode)
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183
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184 ;;;###autoload
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185 (defun turn-on-eldoc-mode ()
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186 "Unequivocally turn on eldoc-mode (see variable documentation)."
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187 (interactive)
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188 (eldoc-mode 1))
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189
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190 (defun eldoc-add-command (cmd)
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191 "Add COMMAND to the list of commands which causes function arg display.
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192 If called interactively, completion on defined commands is available.
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193
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194 When point is in a sexp, the function args are not reprinted in the echo
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195 area after every possible interactive command because some of them print
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196 their own messages in the echo area; the eldoc functions would instantly
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197 overwrite them unless it is more restrained."
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198 (interactive "CAdd function to eldoc message commands list: ")
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199 (and (fboundp cmd)
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200 (set (intern (symbol-name cmd) eldoc-message-commands) t)))
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201
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202 (defun eldoc-remove-command (cmd)
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203 "Remove COMMAND from the list of commands which causes function arg display.
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204 If called interactively, completion matches only those functions currently
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205 in the list.
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206
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207 When point is in a sexp, the function args are not reprinted in the echo
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208 area after every possible interactive command because some of them print
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209 their own messages in the echo area; the eldoc functions would instantly
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210 overwrite them unless it is more restrained."
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211 (interactive (list (completing-read
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212 "Remove function from eldoc message commands list: "
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213 eldoc-message-commands 'boundp t)))
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214 (and (symbolp cmd)
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215 (setq cmd (symbol-name cmd)))
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216 (if (fboundp 'unintern)
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217 (unintern cmd eldoc-message-commands)
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218 (let ((s (intern-soft cmd eldoc-message-commands)))
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219 (and s
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220 (makunbound s)))))
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221
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222 ;; Idle timers are part of Emacs 19.31 and later.
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223 (defun eldoc-schedule-timer ()
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224 (or (and eldoc-timer
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225 (memq eldoc-timer timer-idle-list))
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226 (setq eldoc-timer
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227 (run-with-idle-timer eldoc-idle-delay t
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228 'eldoc-print-current-symbol-info)))
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229
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230 ;; If user has changed the idle delay, update the timer.
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231 (cond ((not (= eldoc-idle-delay eldoc-current-idle-delay))
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232 (setq eldoc-current-idle-delay eldoc-idle-delay)
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233 (timer-set-idle-time eldoc-timer eldoc-idle-delay t))))
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234
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235
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236 (defun eldoc-print-current-symbol-info ()
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237 (and eldoc-mode
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238 (not executing-kbd-macro)
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239
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240 ;; Having this mode operate in an active minibuffer makes it
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241 ;; impossible to see what you're doing.
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242 (not (eq (selected-window) (minibuffer-window)))
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243
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244 (cond (eldoc-use-idle-timer-p
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245 (and (symbolp last-command)
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246 (intern-soft (symbol-name last-command)
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247 eldoc-message-commands)))
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248 (t
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249 ;; If we don't have idle timers, this function is
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250 ;; running on post-command-hook directly; that means the
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251 ;; user's last command is still on `this-command', and we
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252 ;; must wait briefly for input to see whether to do display.
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253 (and (symbolp this-command)
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254 (intern-soft (symbol-name this-command)
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255 eldoc-message-commands)
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256 (sit-for eldoc-idle-delay))))
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257
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258 (let ((current-symbol (eldoc-current-symbol))
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259 (current-fnsym (eldoc-fnsym-in-current-sexp)))
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260 (cond ((eq current-symbol current-fnsym)
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261 (eldoc-print-fnsym-args current-fnsym))
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262 (t
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263 (or (eldoc-print-var-docstring current-symbol)
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264 (eldoc-print-fnsym-args current-fnsym)))))))
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265
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266 (defun eldoc-print-fnsym-args (&optional symbol)
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267 (interactive)
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268 (let ((sym (or symbol (eldoc-fnsym-in-current-sexp)))
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269 (args nil))
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270 (cond ((not (and (symbolp sym)
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271 (fboundp sym))))
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272 ((eq sym (car eldoc-last-data))
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273 (setq args (cdr eldoc-last-data)))
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274 ((subrp (eldoc-symbol-function sym))
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275 (setq args (or (eldoc-function-argstring-from-docstring sym)
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276 (eldoc-docstring-first-line (documentation sym t))))
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277 (setcar eldoc-last-data sym)
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278 (setcdr eldoc-last-data args))
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279 (t
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280 (setq args (eldoc-function-argstring sym))
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281 (setcar eldoc-last-data sym)
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282 (setcdr eldoc-last-data args)))
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283 (and args
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284 (eldoc-message "%s: %s" sym args))))
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285
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286 (defun eldoc-fnsym-in-current-sexp ()
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287 (let* ((p (point))
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288 (sym (progn
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289 (while (and (eldoc-forward-sexp-safe -1)
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290 (> (point) (point-min))))
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291 (cond ((or (= (point) (point-min))
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292 (memq (or (char-after (point)) 0)
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293 '(?\( ?\"))
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294 ;; If we hit a quotation mark before a paren, we
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295 ;; are inside a specific string, not a list of
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296 ;; symbols.
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297 (eq (or (char-after (1- (point))) 0) ?\"))
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298 nil)
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299 (t (condition-case nil
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300 (read (current-buffer))
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301 (error nil)))))))
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302 (goto-char p)
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303 (and (symbolp sym)
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304 sym)))
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305
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306 (defun eldoc-function-argstring (fn)
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307 (let* ((prelim-def (eldoc-symbol-function fn))
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308 (def (if (eq (car-safe prelim-def) 'macro)
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309 (cdr prelim-def)
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310 prelim-def))
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311 (arglist (cond ((null def) nil)
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312 ((byte-code-function-p def)
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313 (if (fboundp 'compiled-function-arglist)
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314 (funcall 'compiled-function-arglist def)
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315 (aref def 0)))
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316 ((eq (car-safe def) 'lambda)
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317 (nth 1 def))
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318 (t t))))
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319 (eldoc-function-argstring-format arglist)))
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320
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321 (defun eldoc-function-argstring-format (arglist)
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322 (cond ((not (listp arglist))
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323 (setq arglist nil))
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324 ((symbolp (car arglist))
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325 (setq arglist
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326 (mapcar (function (lambda (s)
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327 (if (memq s '(&optional &rest))
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328 (symbol-name s)
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329 (funcall eldoc-argument-case
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330 (symbol-name s)))))
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331 arglist)))
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332 ((stringp (car arglist))
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333 (setq arglist
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334 (mapcar (function (lambda (s)
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335 (if (member s '("&optional" "&rest"))
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336 s
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337 (funcall eldoc-argument-case s))))
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338 arglist))))
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339 (concat "(" (mapconcat 'identity arglist " ") ")"))
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340
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341
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342 (defun eldoc-print-var-docstring (&optional sym)
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343 (or sym (setq sym (eldoc-current-symbol)))
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344 (eldoc-print-docstring sym (documentation-property
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345 sym 'variable-documentation t)))
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346
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347 ;; Print the brief (one-line) documentation string for the symbol.
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348 (defun eldoc-print-docstring (symbol doc)
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349 (and doc
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350 (eldoc-message "%s" (eldoc-docstring-message symbol doc))))
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351
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352 ;; If the entire line cannot fit in the echo area, the variable name may be
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353 ;; truncated or eliminated entirely from the output to make room.
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354 ;; Any leading `*' in the docstring (which indicates the variable is a user
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355 ;; option) is not printed."
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356 (defun eldoc-docstring-message (symbol doc)
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357 (and doc
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358 (let ((name (symbol-name symbol)))
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359 (setq doc (eldoc-docstring-first-line doc))
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360 (save-match-data
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361 (let* ((doclen (+ (length name) (length ": ") (length doc)))
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362 ;; Subtract 1 from window width since emacs seems not to
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363 ;; write any chars to the last column, at least for some
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364 ;; terminal types.
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365 (strip (- doclen (1- (window-width (minibuffer-window))))))
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366 (cond ((> strip 0)
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367 (let* ((len (length name)))
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368 (cond ((>= strip len)
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369 (format "%s" doc))
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370 (t
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371 (setq name (substring name 0 (- len strip)))
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372 (format "%s: %s" name doc)))))
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373 (t
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374 (format "%s: %s" symbol doc))))))))
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375
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376 (defun eldoc-docstring-first-line (doc)
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377 (save-match-data
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378 (and (string-match "\n" doc)
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379 (setq doc (substring doc 0 (match-beginning 0))))
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380 (and (string-match "^\\*" doc)
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381 (setq doc (substring doc 1))))
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382 doc)
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383
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384
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385 ;; Alist of predicate/action pairs.
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386 ;; Each member of the list is a sublist consisting of a predicate function
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387 ;; used to determine if the arglist for a function can be found using a
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388 ;; certain pattern, and a function which returns the actual arglist from
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389 ;; that docstring.
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390 ;;
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391 ;; The order in this table is significant, since later predicates may be
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392 ;; more general than earlier ones.
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393 ;;
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394 ;; Compiler note for Emacs 19.29 and later: these functions will be
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395 ;; compiled to bytecode, but can't be lazy-loaded even if you set
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396 ;; byte-compile-dynamic; to do that would require making them named
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397 ;; top-level defuns, and that's not particularly desirable either.
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398 (defconst eldoc-function-argstring-from-docstring-method-table
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399 (list
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400 ;; Try first searching for args starting with symbol name.
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401 ;; This is to avoid matching parenthetical remarks in e.g. sit-for.
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402 (list (function (lambda (doc fn)
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403 (string-match (format "^(%s[^\n)]*)$" fn) doc)))
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404 (function (lambda (doc)
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405 ;; end does not include trailing ")" sequence.
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406 (let ((end (- (match-end 0) 1)))
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407 (if (string-match " +" doc (match-beginning 0))
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408 (substring doc (match-end 0) end)
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409 "")))))
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410
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411 ;; Try again not requiring this symbol name in the docstring.
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412 ;; This will be the case when looking up aliases.
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413 (list (function (lambda (doc fn)
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414 (string-match "^([^\n)]+)$" doc)))
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415 (function (lambda (doc)
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416 ;; end does not include trailing ")" sequence.
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417 (let ((end (- (match-end 0) 1)))
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418 (and (string-match " +" doc (match-beginning 0))
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419 (substring doc (match-end 0) end))))))
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420
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421 ;; Emacs subr docstring style:
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422 ;; (fn arg1 arg2 ...): description...
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423 (list (function (lambda (doc fn)
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424 (string-match "^([^\n)]+):" doc)))
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425 (function (lambda (doc)
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426 ;; end does not include trailing "):" sequence.
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427 (let ((end (- (match-end 0) 2)))
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428 (and (string-match " +" doc (match-beginning 0))
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429 (substring doc (match-end 0) end))))))
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430
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431 ;; XEmacs subr docstring style:
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432 ;; "arguments: (arg1 arg2 ...)
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433 (list (function (lambda (doc fn)
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434 (string-match "^arguments: (\\([^\n)]+\\))" doc)))
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435 (function (lambda (doc)
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436 ;; also skip leading paren, but the first word is
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437 ;; actually an argument, not the function name.
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438 (substring doc (match-beginning 1) (match-end 1)))))
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439
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440 ;; This finds the argstring for `condition-case'. Any others?
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441 (list (function (lambda (doc fn)
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442 (string-match
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443 (format "^Usage looks like \\((%s[^\n)]*)\\)\\.$" fn)
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444 doc)))
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445 (function (lambda (doc)
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446 ;; end does not include trailing ")" sequence.
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447 (let ((end (- (match-end 1) 1)))
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448 (and (string-match " +" doc (match-beginning 1))
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449 (substring doc (match-end 0) end))))))
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450
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451 ;; This finds the argstring for `setq-default'. Any others?
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452 (list (function (lambda (doc fn)
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453 (string-match (format "^[ \t]+\\((%s[^\n)]*)\\)$" fn)
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454 doc)))
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455 (function (lambda (doc)
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456 ;; end does not include trailing ")" sequence.
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457 (let ((end (- (match-end 1) 1)))
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458 (and (string-match " +" doc (match-beginning 1))
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459 (substring doc (match-end 0) end))))))
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460
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461 ;; This finds the argstring for `start-process'. Any others?
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462 (list (function (lambda (doc fn)
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463 (string-match "^Args are +\\([^\n]+\\)$" doc)))
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464 (function (lambda (doc)
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465 (substring doc (match-beginning 1) (match-end 1)))))
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466 ))
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467
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468 (defun eldoc-function-argstring-from-docstring (fn)
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469 (let ((docstring (documentation fn 'raw))
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470 (table eldoc-function-argstring-from-docstring-method-table)
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471 (doc nil)
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472 (doclist nil))
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473 (save-match-data
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474 (while table
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475 (cond ((funcall (car (car table)) docstring fn)
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476 (setq doc (funcall (car (cdr (car table))) docstring))
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477 (setq table nil))
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478 (t
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479 (setq table (cdr table)))))
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480
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481 (cond ((not (stringp doc))
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482 nil)
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483 ((string-match "&" doc)
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484 (let ((p 0)
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485 (l (length doc)))
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486 (while (< p l)
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487 (cond ((string-match "[ \t\n]+" doc p)
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488 (setq doclist
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489 (cons (substring doc p (match-beginning 0))
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490 doclist))
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491 (setq p (match-end 0)))
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492 (t
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493 (setq doclist (cons (substring doc p) doclist))
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494 (setq p l))))
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495 (eldoc-function-argstring-format (nreverse doclist))))
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496 (t
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497 (concat "(" (funcall eldoc-argument-case doc) ")"))))))
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498
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499
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500 ;; forward-sexp calls scan-sexps, which returns an error if it hits the
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501 ;; beginning or end of the sexp. This returns nil instead.
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502 (defun eldoc-forward-sexp-safe (&optional count)
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503 "Move forward across one balanced expression (sexp).
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504 With argument, do it that many times. Negative arg -COUNT means
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505 move backward across COUNT balanced expressions.
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506 Return distance in buffer moved, or nil."
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507 (or count (setq count 1))
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508 (condition-case err
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509 (- (- (point) (progn
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510 (let ((parse-sexp-ignore-comments t))
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511 (forward-sexp count))
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512 (point))))
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513 (error nil)))
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514
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515 ;; Do indirect function resolution if possible.
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516 (defun eldoc-symbol-function (fsym)
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517 (let ((defn (and (fboundp fsym)
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518 (symbol-function fsym))))
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519 (and (symbolp defn)
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520 (condition-case err
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521 (setq defn (indirect-function fsym))
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522 (error (setq defn nil))))
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523 defn))
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524
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525 (defun eldoc-current-symbol ()
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526 (let ((c (char-after (point))))
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527 (and c
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528 (memq (char-syntax c) '(?w ?_))
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529 (intern-soft (current-word)))))
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530
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531 (provide 'eldoc)
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532
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533 ;;; eldoc.el ends here
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