1995-11-12 21:04:08 +00:00
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;;; eldoc.el --- show function arglist or variable docstring in echo area
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2006-12-07 05:06:17 +00:00
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;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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2009-01-05 03:18:22 +00:00
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;; 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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1995-11-12 21:04:08 +00:00
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1998-09-19 02:15:26 +00:00
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;; Author: Noah Friedman <friedman@splode.com>
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;; Maintainer: friedman@splode.com
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1995-11-12 21:04:08 +00:00
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;; Keywords: extensions
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;; Created: 1995-10-06
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1997-02-03 06:13:34 +00:00
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;; This file is part of GNU Emacs.
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1995-11-12 21:04:08 +00:00
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2008-05-06 03:21:21 +00:00
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;; GNU Emacs is free software: you can redistribute it and/or modify
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1995-11-12 21:04:08 +00:00
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;; it under the terms of the GNU General Public License as published by
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2008-05-06 03:21:21 +00:00
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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1997-02-03 06:13:34 +00:00
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;; GNU Emacs is distributed in the hope that it will be useful,
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1995-11-12 21:04:08 +00:00
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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1997-02-03 06:13:34 +00:00
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1995-11-12 21:04:08 +00:00
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;; You should have received a copy of the GNU General Public License
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2008-05-06 03:21:21 +00:00
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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1995-11-12 21:04:08 +00:00
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;;; Commentary:
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1997-02-03 06:13:34 +00:00
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;; This program was inspired by the behavior of the "mouse documentation
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;; window" on many Lisp Machine systems; as you type a function's symbol
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;; name as part of a sexp, it will print the argument list for that
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;; function. Behavior is not identical; for example, you need not actually
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;; type the function name, you need only move point around in a sexp that
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;; calls it. Also, if point is over a documented variable, it will print
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;; the one-line documentation for that variable instead, to remind you of
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;; that variable's meaning.
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1995-11-12 21:04:08 +00:00
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;; One useful way to enable this minor mode is to put the following in your
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;; .emacs:
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;;
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;; (add-hook 'emacs-lisp-mode-hook 'turn-on-eldoc-mode)
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;; (add-hook 'lisp-interaction-mode-hook 'turn-on-eldoc-mode)
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1997-02-04 18:21:29 +00:00
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;; (add-hook 'ielm-mode-hook 'turn-on-eldoc-mode)
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1995-11-12 21:04:08 +00:00
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2003-09-06 17:32:31 +00:00
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;; Major modes for other languages may use Eldoc by defining an
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;; appropriate function as the buffer-local value of
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2005-04-26 11:00:56 +00:00
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;; `eldoc-documentation-function'.
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2003-09-06 17:32:31 +00:00
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1995-11-12 21:04:08 +00:00
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;;; Code:
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2002-11-19 23:32:54 +00:00
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(require 'help-fns) ;For fundoc-usage handling functions.
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1997-04-14 07:33:28 +00:00
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(defgroup eldoc nil
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"Show function arglist or variable docstring in echo area."
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2000-07-24 00:38:34 +00:00
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:group 'lisp
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1997-04-14 07:33:28 +00:00
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:group 'extensions)
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(defcustom eldoc-idle-delay 0.50
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1995-11-12 21:04:08 +00:00
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"*Number of seconds of idle time to wait before printing.
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If user input arrives before this interval of time has elapsed after the
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last input, no documentation will be printed.
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1997-04-14 07:33:28 +00:00
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If this variable is set to 0, no idle time is required."
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:type 'number
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:group 'eldoc)
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1995-11-12 21:04:08 +00:00
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2000-07-24 00:38:34 +00:00
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;;;###autoload
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1997-04-14 07:33:28 +00:00
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(defcustom eldoc-minor-mode-string " ElDoc"
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2002-01-08 23:57:49 +00:00
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"*String to display in mode line when Eldoc Mode is enabled; nil for none."
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:type '(choice string (const :tag "None" nil))
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1997-04-14 07:33:28 +00:00
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:group 'eldoc)
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1997-02-03 06:13:34 +00:00
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1997-04-14 07:33:28 +00:00
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(defcustom eldoc-argument-case 'upcase
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1995-11-12 21:04:08 +00:00
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"Case to display argument names of functions, as a symbol.
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This has two preferred values: `upcase' or `downcase'.
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Actually, any name of a function which takes a string as an argument and
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1997-04-14 07:33:28 +00:00
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returns another string is acceptable."
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2000-07-24 00:38:34 +00:00
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:type '(radio (function-item upcase)
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(function-item downcase)
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function)
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1997-04-14 07:33:28 +00:00
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:group 'eldoc)
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1995-11-12 21:04:08 +00:00
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2000-07-24 00:38:34 +00:00
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(defcustom eldoc-echo-area-use-multiline-p 'truncate-sym-name-if-fit
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"*Allow long eldoc messages to resize echo area display.
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2003-05-06 17:36:16 +00:00
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If value is t, never attempt to truncate messages; complete symbol name
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2000-07-24 00:38:34 +00:00
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and function arglist or 1-line variable documentation will be displayed
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even if echo area must be resized to fit.
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2003-05-06 17:36:16 +00:00
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If value is any non-nil value other than t, symbol name may be truncated
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2000-07-24 00:38:34 +00:00
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if it will enable the function arglist or documentation string to fit on a
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single line without resizing window. Otherwise, behavior is just like
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former case.
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If value is nil, messages are always truncated to fit in a single line of
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display in the echo area. Function or variable symbol name may be
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2003-02-11 00:11:55 +00:00
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truncated to make more of the arglist or documentation string visible."
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2000-07-24 00:38:34 +00:00
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:type '(radio (const :tag "Always" t)
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(const :tag "Never" nil)
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(const :tag "Yes, but truncate symbol names if it will\
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enable argument list to fit on one line" truncate-sym-name-if-fit))
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:group 'eldoc)
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2007-08-24 02:30:59 +00:00
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(defface eldoc-highlight-function-argument
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'((t (:inherit bold)))
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"Face used for the argument at point in a function's argument list."
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:group 'eldoc)
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2000-07-24 00:38:34 +00:00
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;;; No user options below here.
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2005-10-04 21:49:09 +00:00
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(defvar eldoc-message-commands-table-size 31
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2007-09-26 11:55:46 +00:00
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"This is used by `eldoc-add-command' to initialize `eldoc-message-commands'
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2005-10-04 21:49:09 +00:00
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as an obarray.
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It should probably never be necessary to do so, but if you
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choose to increase the number of buckets, you must do so before loading
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this file since the obarray is initialized at load time.
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Remember to keep it a prime number to improve hash performance.")
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(defconst eldoc-message-commands
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(make-vector eldoc-message-commands-table-size 0)
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"Commands after which it is appropriate to print in the echo area.
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Eldoc does not try to print function arglists, etc. after just any command,
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because some commands print their own messages in the echo area and these
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2007-09-26 11:55:46 +00:00
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functions would instantly overwrite them. But `self-insert-command' as well
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2005-10-04 21:49:09 +00:00
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as most motion commands are good candidates.
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This variable contains an obarray of symbols; do not manipulate it
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directly. Instead, use `eldoc-add-command' and `eldoc-remove-command'.")
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(defconst eldoc-last-data (make-vector 3 nil)
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"Bookkeeping; elements are as follows:
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0 - contains the last symbol read from the buffer.
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2007-07-12 01:51:52 +00:00
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1 - contains the string last displayed in the echo area for variables,
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or argument string for functions.
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2005-10-04 21:49:09 +00:00
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2 - 'function if function args, 'variable if variable documentation.")
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1997-02-19 10:24:26 +00:00
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(defvar eldoc-last-message nil)
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1995-11-12 21:04:08 +00:00
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2005-10-04 21:49:09 +00:00
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(defvar eldoc-timer nil "eldoc's timer object.")
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1997-02-03 06:13:34 +00:00
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2005-10-04 21:49:09 +00:00
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(defvar eldoc-current-idle-delay eldoc-idle-delay
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2007-09-26 11:55:46 +00:00
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"Idle time delay currently in use by timer.
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2005-10-04 21:49:09 +00:00
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This is used to determine if `eldoc-idle-delay' is changed by the user.")
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1995-11-12 21:04:08 +00:00
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;;;###autoload
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2001-11-16 23:58:48 +00:00
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(define-minor-mode eldoc-mode
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"Toggle ElDoc mode on or off.
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2005-04-26 10:59:44 +00:00
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In ElDoc mode, the echo area displays information about a
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function or variable in the text where point is. If point is
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2005-05-18 15:11:36 +00:00
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on a documented variable, it displays the first line of that
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variable's doc string. Otherwise it displays the argument list
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of the function called in the expression point is on.
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2001-11-16 23:58:48 +00:00
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With prefix ARG, turn ElDoc mode on if and only if ARG is positive."
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2005-04-04 09:11:34 +00:00
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:group 'eldoc :lighter eldoc-minor-mode-string
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1997-02-19 10:24:26 +00:00
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(setq eldoc-last-message nil)
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2003-02-11 00:11:55 +00:00
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(if eldoc-mode
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(progn
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(add-hook 'post-command-hook 'eldoc-schedule-timer nil t)
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(add-hook 'pre-command-hook 'eldoc-pre-command-refresh-echo-area t))
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(remove-hook 'post-command-hook 'eldoc-schedule-timer)
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(remove-hook 'pre-command-hook 'eldoc-pre-command-refresh-echo-area)))
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1995-11-12 21:04:08 +00:00
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;;;###autoload
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(defun turn-on-eldoc-mode ()
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2007-05-06 18:10:35 +00:00
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"Unequivocally turn on ElDoc mode (see command `eldoc-mode')."
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1995-11-12 21:04:08 +00:00
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(interactive)
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(eldoc-mode 1))
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1998-09-19 02:15:26 +00:00
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1997-02-03 06:13:34 +00:00
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(defun eldoc-schedule-timer ()
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(or (and eldoc-timer
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(memq eldoc-timer timer-idle-list))
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(setq eldoc-timer
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(run-with-idle-timer eldoc-idle-delay t
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'eldoc-print-current-symbol-info)))
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;; If user has changed the idle delay, update the timer.
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(cond ((not (= eldoc-idle-delay eldoc-current-idle-delay))
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(setq eldoc-current-idle-delay eldoc-idle-delay)
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(timer-set-idle-time eldoc-timer eldoc-idle-delay t))))
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1997-02-19 10:24:26 +00:00
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(defun eldoc-message (&rest args)
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(let ((omessage eldoc-last-message))
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2003-05-06 17:36:16 +00:00
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(setq eldoc-last-message
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2003-02-11 00:11:55 +00:00
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(cond ((eq (car args) eldoc-last-message) eldoc-last-message)
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((null (car args)) nil)
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;; If only one arg, no formatting to do, so put it in
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;; eldoc-last-message so eq test above might succeed on
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;; subsequent calls.
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((null (cdr args)) (car args))
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(t (apply 'format args))))
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1997-02-19 10:24:26 +00:00
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;; In emacs 19.29 and later, and XEmacs 19.13 and later, all messages
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;; are recorded in a log. Do not put eldoc messages in that log since
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;; they are Legion.
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2003-02-11 00:11:55 +00:00
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;; Emacs way of preventing log messages.
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(let ((message-log-max nil))
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(cond (eldoc-last-message (message "%s" eldoc-last-message))
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(omessage (message nil)))))
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1997-02-19 10:24:26 +00:00
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eldoc-last-message)
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1998-09-19 02:15:26 +00:00
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;; This function goes on pre-command-hook for XEmacs or when using idle
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;; timers in Emacs. Motion commands clear the echo area for some reason,
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;; which make eldoc messages flicker or disappear just before motion
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;; begins. This function reprints the last eldoc message immediately
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;; before the next command executes, which does away with the flicker.
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;; This doesn't seem to be required for Emacs 19.28 and earlier.
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(defun eldoc-pre-command-refresh-echo-area ()
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(and eldoc-last-message
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(if (eldoc-display-message-no-interference-p)
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(eldoc-message eldoc-last-message)
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(setq eldoc-last-message nil))))
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1997-02-04 18:21:29 +00:00
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;; Decide whether now is a good time to display a message.
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(defun eldoc-display-message-p ()
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1997-02-19 10:24:26 +00:00
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(and (eldoc-display-message-no-interference-p)
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2003-02-11 00:11:55 +00:00
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;; If this-command is non-nil while running via an idle
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;; timer, we're still in the middle of executing a command,
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;; e.g. a query-replace where it would be annoying to
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;; overwrite the echo area.
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(and (not this-command)
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(symbolp last-command)
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(intern-soft (symbol-name last-command)
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eldoc-message-commands))))
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1995-11-12 21:04:08 +00:00
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2000-07-24 00:38:34 +00:00
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;; Check various conditions about the current environment that might make
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;; it undesirable to print eldoc messages right this instant.
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1997-02-19 10:24:26 +00:00
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(defun eldoc-display-message-no-interference-p ()
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(and eldoc-mode
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(not executing-kbd-macro)
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2000-07-24 00:38:34 +00:00
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(not (and (boundp 'edebug-active) edebug-active))
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1997-02-19 10:24:26 +00:00
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;; Having this mode operate in an active minibuffer/echo area causes
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;; interference with what's going on there.
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(not cursor-in-echo-area)
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(not (eq (selected-window) (minibuffer-window)))))
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1998-09-19 02:15:26 +00:00
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2005-05-14 11:25:31 +00:00
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;;;###autoload
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2005-04-26 10:59:44 +00:00
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(defvar eldoc-documentation-function nil
|
2003-09-06 17:32:31 +00:00
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"If non-nil, function to call to return doc string.
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The function of no args should return a one-line string for displaying
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doc about a function etc. appropriate to the context around point.
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It should return nil if there's no doc appropriate for the context.
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Typically doc is returned if point is on a function-like name or in its
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arg list.
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This variable is expected to be made buffer-local by modes (other than
|
|
|
|
|
Emacs Lisp mode) that support Eldoc.")
|
|
|
|
|
|
1998-09-19 02:15:26 +00:00
|
|
|
|
(defun eldoc-print-current-symbol-info ()
|
2002-11-19 23:32:54 +00:00
|
|
|
|
(condition-case err
|
|
|
|
|
(and (eldoc-display-message-p)
|
2005-04-26 10:59:44 +00:00
|
|
|
|
(if eldoc-documentation-function
|
|
|
|
|
(eldoc-message (funcall eldoc-documentation-function))
|
2003-09-06 17:32:31 +00:00
|
|
|
|
(let* ((current-symbol (eldoc-current-symbol))
|
|
|
|
|
(current-fnsym (eldoc-fnsym-in-current-sexp))
|
|
|
|
|
(doc (cond
|
2007-07-12 01:51:52 +00:00
|
|
|
|
((null current-fnsym)
|
|
|
|
|
nil)
|
|
|
|
|
((eq current-symbol (car current-fnsym))
|
|
|
|
|
(or (apply 'eldoc-get-fnsym-args-string
|
|
|
|
|
current-fnsym)
|
2003-09-06 17:32:31 +00:00
|
|
|
|
(eldoc-get-var-docstring current-symbol)))
|
|
|
|
|
(t
|
|
|
|
|
(or (eldoc-get-var-docstring current-symbol)
|
2007-07-12 01:51:52 +00:00
|
|
|
|
(apply 'eldoc-get-fnsym-args-string
|
|
|
|
|
current-fnsym))))))
|
2003-09-06 17:32:31 +00:00
|
|
|
|
(eldoc-message doc))))
|
2002-11-19 23:32:54 +00:00
|
|
|
|
;; This is run from post-command-hook or some idle timer thing,
|
|
|
|
|
;; so we need to be careful that errors aren't ignored.
|
|
|
|
|
(error (message "eldoc error: %s" err))))
|
1998-09-19 02:15:26 +00:00
|
|
|
|
|
2007-08-19 03:05:35 +00:00
|
|
|
|
(defun eldoc-get-fnsym-args-string (sym &optional index)
|
2007-08-18 23:44:21 +00:00
|
|
|
|
"Return a string containing the parameter list of the function SYM.
|
|
|
|
|
If SYM is a subr and no arglist is obtainable from the docstring
|
2007-08-19 03:05:35 +00:00
|
|
|
|
or elsewhere, return a 1-line docstring. Calls the functions
|
|
|
|
|
`eldoc-function-argstring-format' and
|
|
|
|
|
`eldoc-highlight-function-argument' to format the result. The
|
|
|
|
|
former calls `eldoc-argument-case'; the latter gives the
|
|
|
|
|
function name `font-lock-function-name-face', and optionally
|
|
|
|
|
highlights argument number INDEX. "
|
2007-08-18 23:44:21 +00:00
|
|
|
|
(let (args doc)
|
2003-02-11 00:11:55 +00:00
|
|
|
|
(cond ((not (and sym (symbolp sym) (fboundp sym))))
|
2007-08-18 23:44:21 +00:00
|
|
|
|
((and (eq sym (aref eldoc-last-data 0))
|
|
|
|
|
(eq 'function (aref eldoc-last-data 2)))
|
|
|
|
|
(setq doc (aref eldoc-last-data 1)))
|
2002-11-19 23:32:54 +00:00
|
|
|
|
((setq doc (help-split-fundoc (documentation sym t) sym))
|
|
|
|
|
(setq args (car doc))
|
2007-08-18 23:44:21 +00:00
|
|
|
|
;; Remove any enclosing (), since e-function-argstring adds them.
|
2002-11-19 23:32:54 +00:00
|
|
|
|
(string-match "\\`[^ )]* ?" args)
|
2007-08-18 23:44:21 +00:00
|
|
|
|
(setq args (substring args (match-end 0)))
|
|
|
|
|
(if (string-match ")\\'" args)
|
|
|
|
|
(setq args (substring args 0 -1))))
|
|
|
|
|
(t
|
|
|
|
|
(setq args (help-function-arglist sym))))
|
|
|
|
|
(if args
|
|
|
|
|
;; Stringify, and store before highlighting, downcasing, etc.
|
|
|
|
|
;; FIXME should truncate before storing.
|
|
|
|
|
(eldoc-last-data-store sym (setq args (eldoc-function-argstring args))
|
|
|
|
|
'function)
|
|
|
|
|
(setq args doc)) ; use stored value
|
|
|
|
|
;; Change case, highlight, truncate.
|
|
|
|
|
(if args
|
|
|
|
|
(eldoc-highlight-function-argument
|
2007-08-19 03:05:35 +00:00
|
|
|
|
sym (eldoc-function-argstring-format args) index))))
|
1998-09-19 02:15:26 +00:00
|
|
|
|
|
2007-08-19 03:05:35 +00:00
|
|
|
|
(defun eldoc-highlight-function-argument (sym args index)
|
|
|
|
|
"Highlight argument INDEX in ARGS list for function SYM.
|
|
|
|
|
In the absence of INDEX, just call `eldoc-docstring-format-sym-doc'."
|
2007-07-12 01:51:52 +00:00
|
|
|
|
(let ((start nil)
|
|
|
|
|
(end 0)
|
2007-08-24 02:30:59 +00:00
|
|
|
|
(argument-face 'eldoc-highlight-function-argument))
|
2007-07-12 01:51:52 +00:00
|
|
|
|
;; Find the current argument in the argument string. We need to
|
|
|
|
|
;; handle `&rest' and informal `...' properly.
|
|
|
|
|
;;
|
|
|
|
|
;; FIXME: What to do with optional arguments, like in
|
|
|
|
|
;; (defun NAME ARGLIST [DOCSTRING] BODY...) case?
|
|
|
|
|
;; The problem is there is no robust way to determine if
|
|
|
|
|
;; the current argument is indeed a docstring.
|
2007-08-18 23:44:21 +00:00
|
|
|
|
(while (and index (>= index 1))
|
2007-07-12 01:51:52 +00:00
|
|
|
|
(if (string-match "[^ ()]+" args end)
|
|
|
|
|
(progn
|
|
|
|
|
(setq start (match-beginning 0)
|
|
|
|
|
end (match-end 0))
|
|
|
|
|
(let ((argument (match-string 0 args)))
|
|
|
|
|
(cond ((string= argument "&rest")
|
|
|
|
|
;; All the rest arguments are the same.
|
|
|
|
|
(setq index 1))
|
|
|
|
|
((string= argument "&optional"))
|
|
|
|
|
((string-match "\\.\\.\\.$" argument)
|
|
|
|
|
(setq index 0))
|
|
|
|
|
(t
|
|
|
|
|
(setq index (1- index))))))
|
|
|
|
|
(setq end (length args)
|
|
|
|
|
start (1- end)
|
|
|
|
|
argument-face 'font-lock-warning-face
|
|
|
|
|
index 0)))
|
|
|
|
|
(let ((doc args))
|
|
|
|
|
(when start
|
|
|
|
|
(setq doc (copy-sequence args))
|
|
|
|
|
(add-text-properties start end (list 'face argument-face) doc))
|
|
|
|
|
(setq doc (eldoc-docstring-format-sym-doc
|
|
|
|
|
sym doc 'font-lock-function-name-face))
|
|
|
|
|
doc)))
|
|
|
|
|
|
1998-09-19 02:15:26 +00:00
|
|
|
|
;; Return a string containing a brief (one-line) documentation string for
|
|
|
|
|
;; the variable.
|
|
|
|
|
(defun eldoc-get-var-docstring (sym)
|
2003-01-03 11:46:20 +00:00
|
|
|
|
(when sym
|
|
|
|
|
(cond ((and (eq sym (aref eldoc-last-data 0))
|
|
|
|
|
(eq 'variable (aref eldoc-last-data 2)))
|
|
|
|
|
(aref eldoc-last-data 1))
|
|
|
|
|
(t
|
|
|
|
|
(let ((doc (documentation-property sym 'variable-documentation t)))
|
|
|
|
|
(cond (doc
|
|
|
|
|
(setq doc (eldoc-docstring-format-sym-doc
|
2007-07-12 01:51:52 +00:00
|
|
|
|
sym (eldoc-docstring-first-line doc)
|
|
|
|
|
'font-lock-variable-name-face))
|
2003-01-03 11:46:20 +00:00
|
|
|
|
(eldoc-last-data-store sym doc 'variable)))
|
|
|
|
|
doc)))))
|
1998-09-19 02:15:26 +00:00
|
|
|
|
|
|
|
|
|
(defun eldoc-last-data-store (symbol doc type)
|
|
|
|
|
(aset eldoc-last-data 0 symbol)
|
|
|
|
|
(aset eldoc-last-data 1 doc)
|
|
|
|
|
(aset eldoc-last-data 2 type))
|
|
|
|
|
|
|
|
|
|
;; Note that any leading `*' in the docstring (which indicates the variable
|
|
|
|
|
;; is a user option) is removed.
|
|
|
|
|
(defun eldoc-docstring-first-line (doc)
|
|
|
|
|
(and (stringp doc)
|
|
|
|
|
(substitute-command-keys
|
|
|
|
|
(save-match-data
|
2008-11-28 10:23:21 +00:00
|
|
|
|
;; Don't use "^" in the regexp below since it may match
|
|
|
|
|
;; anywhere in the doc-string.
|
|
|
|
|
(let ((start (if (string-match "\\`\\*" doc) (match-end 0) 0)))
|
1998-09-19 02:15:26 +00:00
|
|
|
|
(cond ((string-match "\n" doc)
|
|
|
|
|
(substring doc start (match-beginning 0)))
|
|
|
|
|
((zerop start) doc)
|
|
|
|
|
(t (substring doc start))))))))
|
|
|
|
|
|
|
|
|
|
;; If the entire line cannot fit in the echo area, the symbol name may be
|
|
|
|
|
;; truncated or eliminated entirely from the output to make room for the
|
|
|
|
|
;; description.
|
2007-07-12 01:51:52 +00:00
|
|
|
|
(defun eldoc-docstring-format-sym-doc (sym doc face)
|
1998-09-19 02:15:26 +00:00
|
|
|
|
(save-match-data
|
|
|
|
|
(let* ((name (symbol-name sym))
|
2003-02-11 00:11:55 +00:00
|
|
|
|
(ea-multi eldoc-echo-area-use-multiline-p)
|
2000-07-24 00:38:34 +00:00
|
|
|
|
;; Subtract 1 from window width since emacs will not write
|
|
|
|
|
;; any chars to the last column, or in later versions, will
|
|
|
|
|
;; cause a wraparound and resize of the echo area.
|
|
|
|
|
(ea-width (1- (window-width (minibuffer-window))))
|
|
|
|
|
(strip (- (+ (length name) (length ": ") (length doc)) ea-width)))
|
|
|
|
|
(cond ((or (<= strip 0)
|
|
|
|
|
(eq ea-multi t)
|
|
|
|
|
(and ea-multi (> (length doc) ea-width)))
|
2007-07-12 01:51:52 +00:00
|
|
|
|
(format "%s: %s" (propertize name 'face face) doc))
|
2000-07-24 00:38:34 +00:00
|
|
|
|
((> (length doc) ea-width)
|
|
|
|
|
(substring (format "%s" doc) 0 ea-width))
|
|
|
|
|
((>= strip (length name))
|
|
|
|
|
(format "%s" doc))
|
1998-09-19 02:15:26 +00:00
|
|
|
|
(t
|
2000-07-24 00:38:34 +00:00
|
|
|
|
;; Show the end of the partial symbol name, rather
|
|
|
|
|
;; than the beginning, since the former is more likely
|
|
|
|
|
;; to be unique given package namespace conventions.
|
|
|
|
|
(setq name (substring name strip))
|
2007-07-12 01:51:52 +00:00
|
|
|
|
(format "%s: %s" (propertize name 'face face) doc))))))
|
1995-11-12 21:04:08 +00:00
|
|
|
|
|
1998-09-19 02:15:26 +00:00
|
|
|
|
|
2007-07-12 01:51:52 +00:00
|
|
|
|
;; Return a list of current function name and argument index.
|
1995-11-12 21:04:08 +00:00
|
|
|
|
(defun eldoc-fnsym-in-current-sexp ()
|
2007-07-12 01:51:52 +00:00
|
|
|
|
(save-excursion
|
|
|
|
|
(let ((argument-index (1- (eldoc-beginning-of-sexp))))
|
|
|
|
|
;; If we are at the beginning of function name, this will be -1.
|
|
|
|
|
(when (< argument-index 0)
|
|
|
|
|
(setq argument-index 0))
|
|
|
|
|
;; Don't do anything if current word is inside a string.
|
|
|
|
|
(if (= (or (char-after (1- (point))) 0) ?\")
|
|
|
|
|
nil
|
|
|
|
|
(list (eldoc-current-symbol) argument-index)))))
|
|
|
|
|
|
|
|
|
|
;; Move to the beginnig of current sexp. Return the number of nested
|
|
|
|
|
;; sexp the point was over or after.
|
1997-02-19 10:24:26 +00:00
|
|
|
|
(defun eldoc-beginning-of-sexp ()
|
2007-07-12 01:51:52 +00:00
|
|
|
|
(let ((parse-sexp-ignore-comments t)
|
|
|
|
|
(num-skipped-sexps 0))
|
1997-02-19 10:24:26 +00:00
|
|
|
|
(condition-case err
|
2007-07-12 01:51:52 +00:00
|
|
|
|
(progn
|
|
|
|
|
;; First account for the case the point is directly over a
|
|
|
|
|
;; beginning of a nested sexp.
|
|
|
|
|
(condition-case err
|
|
|
|
|
(let ((p (point)))
|
|
|
|
|
(forward-sexp -1)
|
|
|
|
|
(forward-sexp 1)
|
|
|
|
|
(when (< (point) p)
|
|
|
|
|
(setq num-skipped-sexps 1)))
|
|
|
|
|
(error))
|
|
|
|
|
(while
|
|
|
|
|
(let ((p (point)))
|
|
|
|
|
(forward-sexp -1)
|
|
|
|
|
(when (< (point) p)
|
|
|
|
|
(setq num-skipped-sexps (1+ num-skipped-sexps))))))
|
|
|
|
|
(error))
|
|
|
|
|
num-skipped-sexps))
|
1997-02-19 10:24:26 +00:00
|
|
|
|
|
|
|
|
|
;; returns nil unless current word is an interned symbol.
|
|
|
|
|
(defun eldoc-current-symbol ()
|
|
|
|
|
(let ((c (char-after (point))))
|
|
|
|
|
(and c
|
|
|
|
|
(memq (char-syntax c) '(?w ?_))
|
|
|
|
|
(intern-soft (current-word)))))
|
|
|
|
|
|
|
|
|
|
;; Do indirect function resolution if possible.
|
|
|
|
|
(defun eldoc-symbol-function (fsym)
|
|
|
|
|
(let ((defn (and (fboundp fsym)
|
|
|
|
|
(symbol-function fsym))))
|
|
|
|
|
(and (symbolp defn)
|
|
|
|
|
(condition-case err
|
|
|
|
|
(setq defn (indirect-function fsym))
|
|
|
|
|
(error (setq defn nil))))
|
|
|
|
|
defn))
|
1995-11-12 21:04:08 +00:00
|
|
|
|
|
2007-08-18 23:44:21 +00:00
|
|
|
|
(defun eldoc-function-argstring (arglist)
|
|
|
|
|
"Return ARGLIST as a string enclosed by ().
|
|
|
|
|
ARGLIST is either a string, or a list of strings or symbols."
|
|
|
|
|
(cond ((stringp arglist))
|
|
|
|
|
((not (listp arglist))
|
|
|
|
|
(setq arglist nil))
|
|
|
|
|
((symbolp (car arglist))
|
|
|
|
|
(setq arglist
|
|
|
|
|
(mapconcat (lambda (s) (symbol-name s))
|
|
|
|
|
arglist " ")))
|
|
|
|
|
((stringp (car arglist))
|
|
|
|
|
(setq arglist
|
|
|
|
|
(mapconcat (lambda (s) s)
|
|
|
|
|
arglist " "))))
|
|
|
|
|
(if arglist
|
|
|
|
|
(format "(%s)" arglist)))
|
|
|
|
|
|
|
|
|
|
(defun eldoc-function-argstring-format (argstring)
|
2007-09-26 11:55:46 +00:00
|
|
|
|
"Apply `eldoc-argument-case' to each word in ARGSTRING.
|
2007-08-18 23:44:21 +00:00
|
|
|
|
The words \"&rest\", \"&optional\" are returned unchanged."
|
|
|
|
|
(mapconcat (lambda (s)
|
|
|
|
|
(if (member s '("&optional" "&rest"))
|
|
|
|
|
s
|
|
|
|
|
(funcall eldoc-argument-case s)))
|
2007-09-26 15:59:13 +00:00
|
|
|
|
(split-string argstring "[][ ()]+" t) " "))
|
|
|
|
|
|
1995-11-12 21:04:08 +00:00
|
|
|
|
|
1997-02-19 10:24:26 +00:00
|
|
|
|
;; When point is in a sexp, the function args are not reprinted in the echo
|
|
|
|
|
;; area after every possible interactive command because some of them print
|
|
|
|
|
;; their own messages in the echo area; the eldoc functions would instantly
|
|
|
|
|
;; overwrite them unless it is more restrained.
|
|
|
|
|
;; These functions do display-command table management.
|
|
|
|
|
|
|
|
|
|
(defun eldoc-add-command (&rest cmds)
|
2005-10-04 21:49:09 +00:00
|
|
|
|
(dolist (name cmds)
|
|
|
|
|
(and (symbolp name)
|
|
|
|
|
(setq name (symbol-name name)))
|
|
|
|
|
(set (intern name eldoc-message-commands) t)))
|
1997-02-19 10:24:26 +00:00
|
|
|
|
|
|
|
|
|
(defun eldoc-add-command-completions (&rest names)
|
2005-10-04 21:49:09 +00:00
|
|
|
|
(dolist (name names)
|
|
|
|
|
(apply 'eldoc-add-command (all-completions name obarray 'commandp))))
|
1997-02-19 10:24:26 +00:00
|
|
|
|
|
|
|
|
|
(defun eldoc-remove-command (&rest cmds)
|
2005-10-04 21:49:09 +00:00
|
|
|
|
(dolist (name cmds)
|
|
|
|
|
(and (symbolp name)
|
|
|
|
|
(setq name (symbol-name name)))
|
|
|
|
|
(unintern name eldoc-message-commands)))
|
1997-02-19 10:24:26 +00:00
|
|
|
|
|
|
|
|
|
(defun eldoc-remove-command-completions (&rest names)
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2005-10-04 21:49:09 +00:00
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(dolist (name names)
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1997-02-19 10:24:26 +00:00
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(apply 'eldoc-remove-command
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2005-10-04 21:49:09 +00:00
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(all-completions name eldoc-message-commands))))
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1997-02-19 10:24:26 +00:00
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1998-09-19 02:15:26 +00:00
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1997-02-19 10:24:26 +00:00
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;; Prime the command list.
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(eldoc-add-command-completions
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2005-10-04 21:49:09 +00:00
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"backward-" "beginning-of-" "move-beginning-of-" "delete-other-windows"
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2006-09-08 14:15:02 +00:00
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"delete-window" "handle-select-window"
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2005-10-04 21:49:09 +00:00
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"end-of-" "move-end-of-" "exchange-point-and-mark" "forward-"
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2005-08-12 11:21:54 +00:00
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"indent-for-tab-command" "goto-" "mark-page" "mark-paragraph"
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"mouse-set-point" "move-" "pop-global-mark" "next-" "other-window"
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"previous-" "recenter" "scroll-" "self-insert-command"
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"split-window-" "up-list" "down-list")
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1995-11-12 21:04:08 +00:00
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(provide 'eldoc)
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2005-10-04 21:49:09 +00:00
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;; arch-tag: c9a58f9d-2055-46c1-9b82-7248b71a8375
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1995-11-12 21:04:08 +00:00
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;;; eldoc.el ends here
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