;;; eldoc.el --- show function arglist or variable docstring in echo area
-;; Copyright (C) 1996, 97, 98, 99, 2000 Free Software Foundation, Inc.
+;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004,
+;; 2005 Free Software Foundation, Inc.
;; Author: Noah Friedman <friedman@splode.com>
;; Maintainer: friedman@splode.com
;; Keywords: extensions
;; Created: 1995-10-06
-;; $Id: eldoc.el,v 1.20 2002/01/08 23:57:30 rms Exp $
-
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; One useful way to enable this minor mode is to put the following in your
;; .emacs:
;;
-;; (autoload 'turn-on-eldoc-mode "eldoc" nil t)
;; (add-hook 'emacs-lisp-mode-hook 'turn-on-eldoc-mode)
;; (add-hook 'lisp-interaction-mode-hook 'turn-on-eldoc-mode)
;; (add-hook 'ielm-mode-hook 'turn-on-eldoc-mode)
+;; Major modes for other languages may use Eldoc by defining an
+;; appropriate function as the buffer-local value of
+;; `eldoc-documentation-function'.
+
;;; Code:
(require 'help-fns) ;For fundoc-usage handling functions.
-;; Use idle timers if available in the version of emacs running.
-;; Please don't change this to use `require'; this package works
-;; as-is in XEmacs 19.14 and later and I am striving to maintain
-;; compatibility between emacs variants.
-(or (featurep 'timer)
- (load "timer" t))
-
(defgroup eldoc nil
"Show function arglist or variable docstring in echo area."
:group 'lisp
(defcustom eldoc-echo-area-use-multiline-p 'truncate-sym-name-if-fit
"*Allow long eldoc messages to resize echo area display.
-If value is `t', never attempt to truncate messages; complete symbol name
+If value is t, never attempt to truncate messages; complete symbol name
and function arglist or 1-line variable documentation will be displayed
even if echo area must be resized to fit.
-If value is any non-nil value other than `t', symbol name may be truncated
+If value is any non-nil value other than t, symbol name may be truncated
if it will enable the function arglist or documentation string to fit on a
single line without resizing window. Otherwise, behavior is just like
former case.
If value is nil, messages are always truncated to fit in a single line of
display in the echo area. Function or variable symbol name may be
-truncated to make more of the arglist or documentation string visible.
-
-Non-nil values for this variable have no effect unless
-`eldoc-echo-area-multiline-supported-p' is non-nil."
+truncated to make more of the arglist or documentation string visible."
:type '(radio (const :tag "Always" t)
(const :tag "Never" nil)
(const :tag "Yes, but truncate symbol names if it will\
;;; No user options below here.
-;; Non-nil if this version of emacs supports dynamically resizable echo areas.
-(defvar eldoc-echo-area-multiline-supported-p
- (and (string-lessp "21" emacs-version)
- (save-match-data
- (numberp (string-match "^GNU Emacs" (emacs-version))))))
-
;; Commands after which it is appropriate to print in the echo area.
;; Eldoc does not try to print function arglists, etc. after just any command,
;; because some commands print their own messages in the echo area and these
(defvar eldoc-last-data (make-vector 3 nil))
(defvar eldoc-last-message nil)
-;; Idle timers are supported in Emacs 19.31 and later.
-(defvar eldoc-use-idle-timer-p (fboundp 'run-with-idle-timer))
-
-;; eldoc's timer object, if using idle timers
+;; eldoc's timer object.
(defvar eldoc-timer nil)
;; idle time delay currently in use by timer.
;;;###autoload
(define-minor-mode eldoc-mode
"Toggle ElDoc mode on or off.
-Show the defined parameters for the elisp function near point.
-
-For the emacs lisp function at the beginning of the sexp which point is
-within, show the defined parameters for the function in the echo area.
-This information is extracted directly from the function or macro if it is
-in pure lisp. If the emacs function is a subr, the parameters are obtained
-from the documentation string if possible.
-
-If point is over a documented variable, print that variable's docstring
-instead.
+In ElDoc mode, the echo area displays information about a
+function or variable in the text where point is. If point is
+on a documented variable, it displays the first line of that
+variable's doc string. Otherwise it displays the argument list
+of the function called in the expression point is on.
With prefix ARG, turn ElDoc mode on if and only if ARG is positive."
- nil eldoc-minor-mode-string nil
+ :group 'eldoc :lighter eldoc-minor-mode-string
(setq eldoc-last-message nil)
- (cond (eldoc-use-idle-timer-p
- (add-hook 'post-command-hook 'eldoc-schedule-timer)
- (add-hook 'pre-command-hook 'eldoc-pre-command-refresh-echo-area))
- (t
- ;; Use post-command-idle-hook if defined, otherwise use
- ;; post-command-hook. The former is only proper to use in Emacs
- ;; 19.30; that is the first version in which it appeared, but it
- ;; was obsolesced by idle timers in Emacs 19.31.
- (add-hook (if (boundp 'post-command-idle-hook)
- 'post-command-idle-hook
- 'post-command-hook)
- 'eldoc-print-current-symbol-info t t)
- ;; quick and dirty hack for seeing if this is XEmacs
- (and (fboundp 'display-message)
- (add-hook 'pre-command-hook
- 'eldoc-pre-command-refresh-echo-area t t)))))
+ (if eldoc-mode
+ (progn
+ (add-hook 'post-command-hook 'eldoc-schedule-timer nil t)
+ (add-hook 'pre-command-hook 'eldoc-pre-command-refresh-echo-area t))
+ (remove-hook 'post-command-hook 'eldoc-schedule-timer)
+ (remove-hook 'pre-command-hook 'eldoc-pre-command-refresh-echo-area)))
;;;###autoload
(defun turn-on-eldoc-mode ()
(eldoc-mode 1))
\f
-;; Idle timers are part of Emacs 19.31 and later.
(defun eldoc-schedule-timer ()
(or (and eldoc-timer
(memq eldoc-timer timer-idle-list))
(defun eldoc-message (&rest args)
(let ((omessage eldoc-last-message))
- (cond ((eq (car args) eldoc-last-message))
- ((or (null args)
- (null (car args)))
- (setq eldoc-last-message nil))
- ;; If only one arg, no formatting to do so put it in
- ;; eldoc-last-message so eq test above might succeed on
- ;; subsequent calls.
- ((null (cdr args))
- (setq eldoc-last-message (car args)))
- (t
- (setq eldoc-last-message (apply 'format args))))
+ (setq eldoc-last-message
+ (cond ((eq (car args) eldoc-last-message) eldoc-last-message)
+ ((null (car args)) nil)
+ ;; If only one arg, no formatting to do, so put it in
+ ;; eldoc-last-message so eq test above might succeed on
+ ;; subsequent calls.
+ ((null (cdr args)) (car args))
+ (t (apply 'format args))))
;; In emacs 19.29 and later, and XEmacs 19.13 and later, all messages
;; are recorded in a log. Do not put eldoc messages in that log since
;; they are Legion.
- (cond ((fboundp 'display-message)
- ;; XEmacs 19.13 way of preventing log messages.
- (cond (eldoc-last-message
- (display-message 'no-log eldoc-last-message))
- (omessage
- (clear-message 'no-log))))
- (t
- ;; Emacs way of preventing log messages.
- (let ((message-log-max nil))
- (cond (eldoc-last-message
- (message "%s" eldoc-last-message))
- (omessage
- (message nil)))))))
+ ;; Emacs way of preventing log messages.
+ (let ((message-log-max nil))
+ (cond (eldoc-last-message (message "%s" eldoc-last-message))
+ (omessage (message nil)))))
eldoc-last-message)
;; This function goes on pre-command-hook for XEmacs or when using idle
;; Decide whether now is a good time to display a message.
(defun eldoc-display-message-p ()
(and (eldoc-display-message-no-interference-p)
- (cond (eldoc-use-idle-timer-p
- ;; If this-command is non-nil while running via an idle
- ;; timer, we're still in the middle of executing a command,
- ;; e.g. a query-replace where it would be annoying to
- ;; overwrite the echo area.
- (and (not this-command)
- (symbolp last-command)
- (intern-soft (symbol-name last-command)
- eldoc-message-commands)))
- (t
- ;; If we don't have idle timers, this function is
- ;; running on post-command-hook directly; that means the
- ;; user's last command is still on `this-command', and we
- ;; must wait briefly for input to see whether to do display.
- (and (symbolp this-command)
- (intern-soft (symbol-name this-command)
- eldoc-message-commands)
- (sit-for eldoc-idle-delay))))))
+ ;; If this-command is non-nil while running via an idle
+ ;; timer, we're still in the middle of executing a command,
+ ;; e.g. a query-replace where it would be annoying to
+ ;; overwrite the echo area.
+ (and (not this-command)
+ (symbolp last-command)
+ (intern-soft (symbol-name last-command)
+ eldoc-message-commands))))
;; Check various conditions about the current environment that might make
;; it undesirable to print eldoc messages right this instant.
(not (eq (selected-window) (minibuffer-window)))))
\f
+;;;###autoload
+(defvar eldoc-documentation-function nil
+ "If non-nil, function to call to return doc string.
+The function of no args should return a one-line string for displaying
+doc about a function etc. appropriate to the context around point.
+It should return nil if there's no doc appropriate for the context.
+Typically doc is returned if point is on a function-like name or in its
+arg list.
+
+This variable is expected to be made buffer-local by modes (other than
+Emacs Lisp mode) that support Eldoc.")
+
(defun eldoc-print-current-symbol-info ()
(condition-case err
(and (eldoc-display-message-p)
- (let* ((current-symbol (eldoc-current-symbol))
- (current-fnsym (eldoc-fnsym-in-current-sexp))
- (doc (cond
- ((eq current-symbol current-fnsym)
- (or (eldoc-get-fnsym-args-string current-fnsym)
- (eldoc-get-var-docstring current-symbol)))
- (t
- (or (eldoc-get-var-docstring current-symbol)
- (eldoc-get-fnsym-args-string current-fnsym))))))
- (eldoc-message doc)))
+ (if eldoc-documentation-function
+ (eldoc-message (funcall eldoc-documentation-function))
+ (let* ((current-symbol (eldoc-current-symbol))
+ (current-fnsym (eldoc-fnsym-in-current-sexp))
+ (doc (cond
+ ((eq current-symbol current-fnsym)
+ (or (eldoc-get-fnsym-args-string current-fnsym)
+ (eldoc-get-var-docstring current-symbol)))
+ (t
+ (or (eldoc-get-var-docstring current-symbol)
+ (eldoc-get-fnsym-args-string current-fnsym))))))
+ (eldoc-message doc))))
;; 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))))
(defun eldoc-get-fnsym-args-string (sym)
(let ((args nil)
(doc nil))
- (cond ((not (and sym
- (symbolp sym)
- (fboundp sym))))
+ (cond ((not (and sym (symbolp sym) (fboundp sym))))
((and (eq sym (aref eldoc-last-data 0))
(eq 'function (aref eldoc-last-data 2)))
(setq doc (aref eldoc-last-data 1)))
;; Return a string containing a brief (one-line) documentation string for
;; the variable.
(defun eldoc-get-var-docstring (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
- sym (eldoc-docstring-first-line doc)))
- (eldoc-last-data-store sym doc 'variable)))
- doc))))
+ (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
+ sym (eldoc-docstring-first-line doc)))
+ (eldoc-last-data-store sym doc 'variable)))
+ doc)))))
(defun eldoc-last-data-store (symbol doc type)
(aset eldoc-last-data 0 symbol)
(defun eldoc-docstring-format-sym-doc (sym doc)
(save-match-data
(let* ((name (symbol-name sym))
- (ea-multi (and eldoc-echo-area-multiline-supported-p
- eldoc-echo-area-use-multiline-p))
+ (ea-multi eldoc-echo-area-use-multiline-p)
;; 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.
(defun eldoc-add-command-completions (&rest names)
(while names
- (apply 'eldoc-add-command
- (all-completions (car names) obarray 'fboundp))
- (setq names (cdr names))))
+ (apply 'eldoc-add-command
+ (all-completions (car names) obarray 'fboundp))
+ (setq names (cdr names))))
(defun eldoc-remove-command (&rest cmds)
(let (name)
(and (symbolp name)
(setq name (symbol-name name)))
- (if (fboundp 'unintern)
- (unintern name eldoc-message-commands)
- (let ((s (intern-soft name eldoc-message-commands)))
- (and s
- (makunbound s)))))))
+ (unintern name eldoc-message-commands))))
(defun eldoc-remove-command-completions (&rest names)
(while names
;; Prime the command list.
(eldoc-add-command-completions
"backward-" "beginning-of-" "delete-other-windows" "delete-window"
- "end-of-" "forward-" "indent-for-tab-command" "goto-" "mouse-set-point"
- "next-" "other-window" "previous-" "recenter" "scroll-"
- "self-insert-command" "split-window-"
- "up-list" "down-list")
+ "end-of-" "exchange-point-and-mark" "forward-"
+ "indent-for-tab-command" "goto-" "mark-page" "mark-paragraph"
+ "mouse-set-point" "move-" "pop-global-mark" "next-" "other-window"
+ "previous-" "recenter" "scroll-" "self-insert-command"
+ "split-window-" "up-list" "down-list")
(provide 'eldoc)
+;;; arch-tag: c9a58f9d-2055-46c1-9b82-7248b71a8375
;;; eldoc.el ends here