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-;;; eldoc.el --- show function arglist or variable docstring in echo area
-
-;; Copyright (C) 1995 Noah S. Friedman
-
-;; Author: Noah Friedman <friedman@prep.ai.mit.edu>
-;; Maintainer: friedman@prep.ai.mit.edu
-;; Keywords: extensions
-;; Status: Works in Emacs 19 and XEmacs.
-;; Created: 1995-10-06
-
-;; LCD Archive Entry:
-;; eldoc|Noah Friedman|friedman@prep.ai.mit.edu|
-;; show function arglist or variable docstring in echo area|
-;; $Date: 1996/07/14 16:46:25 $|$Revision: 1.6 $|~/misc/eldoc.el.gz|
-
-;; $Id: eldoc.el,v 1.6 1996/07/14 16:46:25 friedman Exp friedman $
-
-;; This program is free software; you can redistribute it and/or modify
-;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation; either version 2, or (at your option)
-;; any later version.
-;;
-;; This program is distributed in the hope that it will be useful,
-;; but WITHOUT ANY WARRANTY; without even the implied warranty of
-;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-;; GNU General Public License for more details.
-;;
-;; You should have received a copy of the GNU General Public License
-;; along with this program; if not, you can either send email to this
-;; program's maintainer or write to: The Free Software Foundation,
-;; Inc.; 59 Temple Place, Suite 330; Boston, MA 02111-1307, USA.
-
-;;; Commentary:
-
-;; This program was inspired by the behavior of the Lisp Machine "mouse
-;; documentation window"; as you type a function's symbol name as part of a
-;; sexp, it will print the argument list for that function. However, this
-;; program's behavior is different in a couple of significant ways. For
-;; one, you need not actually type the function name; you need only move
-;; point around in a sexp that calls it. However, if point is over a
-;; documented variable, it will print the one-line documentation for that
-;; variable instead, to remind you of that variable's purpose.
-
-;; 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)
-
-;;; Code:
-
-;;;###autoload
-(defvar eldoc-mode nil
- "*If non-nil, 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; see function `eldoc-print-var-docstring'.
-
-This variable is buffer-local.")
-(make-variable-buffer-local 'eldoc-mode)
-
-(defvar eldoc-idle-delay 0.50
- "*Number of seconds of idle time to wait before printing.
-If user input arrives before this interval of time has elapsed after the
-last input, no documentation will be printed.
-
-If this variable is set to 0, no idle time is required.")
-
-(defvar eldoc-argument-case 'upcase
- "Case to display argument names of functions, as a symbol.
-This has two preferred values: `upcase' or `downcase'.
-Actually, any name of a function which takes a string as an argument and
-returns another string is acceptable.")
-
-(defvar eldoc-mode-message-commands nil
- "*Obarray of command names where it is appropriate to print in the echo area.
-
-This is not done for all commands since some print their own
-messages in the echo area, and these functions would instantly overwrite
-them. But self-insert-command as well as most motion commands are good
-candidates.
-
-It is probably best to manipulate this data structure with the commands
-`eldoc-add-command' and `eldoc-remove-command'.")
-
-(cond ((null eldoc-mode-message-commands)
- ;; If you increase the number of buckets, keep it a prime number.
- (setq eldoc-mode-message-commands (make-vector 31 0))
- (let ((list '("self-insert-command"
- "next-" "previous-"
- "forward-" "backward-"
- "beginning-of-" "end-of-"
- "goto-"
- "recenter"
- "scroll-"))
- (syms nil))
- (while list
- (setq syms (all-completions (car list) obarray 'fboundp))
- (setq list (cdr list))
- (while syms
- (set (intern (car syms) eldoc-mode-message-commands) t)
- (setq syms (cdr syms)))))))
-
-;; Bookkeeping; the car contains the last symbol read from the buffer.
-;; The cdr contains the string last displayed in the echo area, so it can
-;; be printed again if necessary without reconsing.
-(defvar eldoc-last-data '(nil . nil))
-
-(defvar eldoc-minor-mode-string " ElDoc"
- "*String to display in mode line when Eldoc Mode is enabled.")
-
-;; Put this minor mode on the global minor-mode-alist.
-(or (assq 'eldoc-mode (default-value 'minor-mode-alist))
- (setq-default minor-mode-alist
- (append (default-value 'minor-mode-alist)
- '((eldoc-mode eldoc-minor-mode-string)))))
-
-;; 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.
-(defmacro eldoc-message (&rest args)
- (if (fboundp 'display-message)
- ;; XEmacs 19.13 way of preventing log messages.
- (list 'display-message '(quote no-log) (apply 'list 'format args))
- (list 'let (list (list 'message-log-max 'nil))
- (apply 'list 'message args))))
-
-
-;;;###autoload
-(defun eldoc-mode (&optional prefix)
- "*If non-nil, then enable eldoc-mode (see variable docstring)."
- (interactive "P")
-
- ;; Make sure it's on the post-command-idle-hook if defined, otherwise put
- ;; it on post-command-hook. The former first appeared in Emacs 19.30.
- (add-hook (if (boundp 'post-command-idle-hook)
- 'post-command-idle-hook
- 'post-command-hook)
- 'eldoc-mode-print-current-symbol-info)
-
- (setq eldoc-mode (if prefix
- (>= (prefix-numeric-value prefix) 0)
- (not eldoc-mode)))
-
- (and (interactive-p)
- (if eldoc-mode
- (message "eldoc-mode is enabled")
- (message "eldoc-mode is disabled")))
- eldoc-mode)
-
-;;;###autoload
-(defun turn-on-eldoc-mode ()
- "Unequivocally turn on eldoc-mode (see variable documentation)."
- (interactive)
- (eldoc-mode 1))
-
-(defun eldoc-add-command (cmd)
- "Add COMMAND to the list of commands which causes function arg display.
-If called interactively, completion matches any bound function.
-
-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."
- (interactive "aAdd function to eldoc message commands list: ")
- (and (fboundp cmd)
- (set (intern (symbol-name cmd) eldoc-mode-message-commands) t)))
-
-(defun eldoc-remove-command (cmd)
- "Remove COMMAND from the list of commands which causes function arg display.
-If called interactively, completion matches only those functions currently
-in the list.
-
-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."
- (interactive (list (completing-read
- "Remove function from eldoc message commands list: "
- eldoc-mode-message-commands 'boundp t)))
- (and (symbolp cmd)
- (setq cmd (symbol-name cmd)))
- (if (fboundp 'unintern)
- (unintern cmd eldoc-mode-message-commands)
- (let ((s (intern-soft cmd eldoc-mode-message-commands)))
- (and s
- (makunbound s)))))
-
-(defun eldoc-mode-print-current-symbol-info ()
- (and eldoc-mode
- (not executing-macro)
- ;; Having this mode operate in the minibuffer makes it impossible to
- ;; see what you're doing.
- (not (eq (selected-window) (minibuffer-window)))
- (sit-for eldoc-idle-delay)
- (symbolp this-command)
- (intern-soft (symbol-name this-command) eldoc-mode-message-commands)
- (let ((current-symbol (eldoc-current-symbol))
- (current-fnsym (eldoc-fnsym-in-current-sexp)))
- (cond ((eq current-symbol current-fnsym)
- (eldoc-print-fnsym-args current-fnsym))
- (t
- (or (eldoc-print-var-docstring current-symbol)
- (eldoc-print-fnsym-args current-fnsym)))))))
-
-
-(defun eldoc-print-var-docstring (&optional sym)
- "Print the brief (one-line) documentation string for the variable at point.
-If called with no argument, print the first line of the variable
-documentation string for the symbol at point in the echo area.
-If called with a symbol, print the line for that symbol.
-
-If the entire line cannot fit in the echo area, the variable name may be
-truncated or eliminated entirely from the output to make room.
-Any leading `*' in the docstring (which indicates the variable is a user
-option) is not printed."
- (interactive)
- (let* ((s (or sym (eldoc-current-symbol)))
- (name (symbol-name s))
- (doc (and s (documentation-property s 'variable-documentation t))))
- (and doc
- (save-match-data
- (and (string-match "\n" doc)
- (setq doc (substring doc 0 (match-beginning 0))))
- (and (string-match "^\\*" doc)
- (setq doc (substring doc 1)))
- (let* ((doclen (+ (length name) (length ": ") (length doc)))
- ;; Subtract 1 from window width since emacs seems not to
- ;; write any chars to the last column, at least for some
- ;; terminal types.
- (strip (- doclen (1- (window-width (minibuffer-window))))))
- (cond ((> strip 0)
- (let* ((len (length name)))
- (cond ((>= strip len)
- (eldoc-message "%s" doc))
- (t
- (setq name (substring name 0 (- len strip)))
- (eldoc-message "%s: %s" name doc)))))
- (t
- (eldoc-message "%s: %s" s doc))))
- t))))
-
-
-;;;###autoload
-(defun eldoc-print-fnsym-args (&optional symbol)
- "*Show the defined parameters for the function near point.
-For the 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."
- (interactive)
- (let ((sym (or symbol (eldoc-fnsym-in-current-sexp)))
- (printit t)
- (args nil))
- (cond ((not (and (symbolp sym)
- (fboundp sym))))
- ((eq sym (car eldoc-last-data))
- (setq printit nil)
- (setq args (cdr eldoc-last-data)))
- ((subrp (eldoc-symbol-function sym))
- (setq args (eldoc-function-argstring-from-docstring sym))
- (setcdr eldoc-last-data args))
- (t
- (setq args (eldoc-function-argstring sym))
- (setcdr eldoc-last-data args)))
- (and args
- printit
- (eldoc-message "%s: %s" sym args))))
-
-(defun eldoc-fnsym-in-current-sexp ()
- (let* ((p (point))
- (sym (progn
- (while (and (eldoc-forward-sexp-safe -1)
- (> (point) (point-min))))
- (cond ((or (= (point) (point-min))
- (memq (or (char-after (point)) 0)
- '(?\( ?\"))
- ;; If we hit a quotation mark before a paren, we
- ;; are inside a specific string, not a list of
- ;; symbols.
- (eq (or (char-after (1- (point))) 0) ?\"))
- nil)
- (t (condition-case nil
- (read (current-buffer))
- (error nil)))))))
- (goto-char p)
- (and (symbolp sym)
- sym)))
-
-(defun eldoc-function-argstring (fn)
- (let* ((prelim-def (eldoc-symbol-function fn))
- (def (if (eq (car-safe prelim-def) 'macro)
- (cdr prelim-def)
- prelim-def))
- (arglist (cond ((null def) nil)
- ((byte-code-function-p def)
- (if (fboundp 'compiled-function-arglist)
- (funcall 'compiled-function-arglist def)
- (aref def 0)))
- ((eq (car-safe def) 'lambda)
- (nth 1 def))
- (t t))))
- (eldoc-function-argstring-format arglist)))
-
-(defun eldoc-function-argstring-from-docstring (fn)
- (let ((docstring (documentation fn 'raw))
- (doc nil)
- (doclist nil)
- (end nil))
- (save-match-data
- ;; TODO: Move these into a separate table that is iterated over until
- ;; a match is found.
- (cond
- ;; Try first searching for args starting with symbol name.
- ;; This is to avoid matching parenthetical remarks in e.g. sit-for.
- ((string-match (format "^(%s[^\n)]*)$" fn) docstring)
- ;; end does not include trailing ")" sequence.
- (setq end (- (match-end 0) 1))
- (if (string-match " +" docstring (match-beginning 0))
- (setq doc (substring docstring (match-end 0) end))
- (setq doc "")))
-
- ;; Try again not requiring this symbol name in the docstring.
- ;; This will be the case when looking up aliases.
- ((string-match (format "^([^\n)]+)$" fn) docstring)
- ;; end does not include trailing ")" sequence.
- (setq end (- (match-end 0) 1))
- (if (string-match " +" docstring (match-beginning 0))
- (setq doc (substring docstring (match-end 0) end))
- (setq doc "")))
-
- ;; Emacs subr docstring style:
- ;; (fn arg1 arg2 ...): description...
- ((string-match "^([^\n)]+):" docstring)
- ;; end does not include trailing "):" sequence.
- (setq end (- (match-end 0) 2))
- (if (string-match " +" docstring (match-beginning 0))
- (setq doc (substring docstring (match-end 0) end))
- (setq doc "")))
-
- ;; XEmacs subr docstring style:
- ;; "arguments: (arg1 arg2 ...)
- ((string-match "^arguments: (\\([^\n)]+\\))" docstring)
- ;; Also, skip leading paren, but the first word is actually an
- ;; argument, not the function name.
- (setq doc (substring docstring
- (match-beginning 1)
- (match-end 1))))
-
- ;; This finds the argstring for `condition-case'.
- ;; I don't know if there are any others with the same pattern.
- ((string-match (format "^Usage looks like \\((%s[^\n)]*)\\)\\.$" fn)
- docstring)
- ;; end does not include trailing ")" sequence.
- (setq end (- (match-end 1) 1))
- (if (string-match " +" docstring (match-beginning 1))
- (setq doc (substring docstring (match-end 0) end))
- (setq doc "")))
-
- ;; This finds the argstring for `setq-default'.
- ;; I don't know if there are any others with the same pattern.
- ((string-match (format "^[ \t]+\\((%s[^\n)]*)\\)$" fn) docstring)
- ;; end does not include trailing ")" sequence.
- (setq end (- (match-end 1) 1))
- (if (string-match " +" docstring (match-beginning 1))
- (setq doc (substring docstring (match-end 0) end))
- (setq doc "")))
-
- ;; This finds the argstring for `start-process'.
- ;; I don't know if there are any others with the same pattern.
- ((string-match "^Args are +\\([^\n]+\\)$" docstring)
- (setq doc (substring docstring (match-beginning 1) (match-end 1))))
- )
-
- (cond ((not (stringp doc))
- nil)
- ((string-match "&" doc)
- (let ((p 0)
- (l (length doc)))
- (while (< p l)
- (cond ((string-match "[ \t\n]+" doc p)
- (setq doclist
- (cons (substring doc p (match-beginning 0))
- doclist))
- (setq p (match-end 0)))
- (t
- (setq doclist (cons (substring doc p) doclist))
- (setq p l))))
- (eldoc-function-argstring-format (nreverse doclist))))
- (t
- (concat "(" (funcall eldoc-argument-case doc) ")"))))))
-
-(defun eldoc-function-argstring-format (arglist)
- (cond ((not (listp arglist))
- (setq arglist nil))
- ((symbolp (car arglist))
- (setq arglist
- (mapcar (function (lambda (s)
- (if (memq s '(&optional &rest))
- (symbol-name s)
- (funcall eldoc-argument-case
- (symbol-name s)))))
- arglist)))
- ((stringp (car arglist))
- (setq arglist
- (mapcar (function (lambda (s)
- (if (member s '("&optional" "&rest"))
- s
- (funcall eldoc-argument-case s))))
- arglist))))
- (concat "(" (mapconcat 'identity arglist " ") ")"))
-
-
-;; forward-sexp calls scan-sexps, which returns an error if it hits the
-;; beginning or end of the sexp. This returns nil instead.
-(defun eldoc-forward-sexp-safe (&optional count)
- "Move forward across one balanced expression (sexp).
-With argument, do it that many times. Negative arg -COUNT means
-move backward across COUNT balanced expressions.
-Return distance in buffer moved, or nil."
- (or count (setq count 1))
- (condition-case err
- (- (- (point) (progn
- (let ((parse-sexp-ignore-comments t))
- (forward-sexp count))
- (point))))
- (error nil)))
-
-;; 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))
-
-(defun eldoc-current-symbol ()
- (let ((c (char-after (point))))
- (and c
- (memq (char-syntax c) '(?w ?_))
- (intern-soft (current-word)))))
-
-(provide 'eldoc)
-
-;;; eldoc.el ends here