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Re-implement the feature of showing eldoc info after editing.

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* emacs-lisp/eldoc.el (eldoc-post-insert-mode): Remove.
(eldoc-edit-message-commands): New function.
(eldoc-print-after-edit): New variable.
(eldoc-pre-command-refresh-echo-area): Emit message only by
eldoc-message-commands.
(eldoc-mode): Restrict eldoc-message-commands to editing commands
if eldoc-print-after-edit is set. 

* progmodes/octave.el (octave-mode-menu): Adapt to change in
eldoc.

Fixes: debbugs:16346
This commit is contained in:
Leo Liu 2014-01-12 12:00:03 +08:00
parent 4efa3f1e0e
commit 9b335362d0
4 changed files with 45 additions and 30 deletions
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52
lisp/emacs-lisp/eldoc.el
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@ -1,4 +1,4 @@
;;; eldoc.el --- show function arglist or variable docstring in echo area
;;; eldoc.el --- show function arglist or variable docstring in echo area -*- lexical-binding: t; -*-
;; Copyright (C) 1996-2014 Free Software Foundation, Inc.
@ -62,6 +62,12 @@ If this variable is set to 0, no idle time is required."
:type 'number
:group 'eldoc)
(defcustom eldoc-print-after-edit nil
"If non-nil eldoc info is only shown when editing.
Changing the value requires toggling `eldoc-mode'."
:type 'boolean
:group 'eldoc)
;;;###autoload
(defcustom eldoc-minor-mode-string (purecopy " ElDoc")
"String to display in mode line when ElDoc Mode is enabled; nil for none."
@ -150,6 +156,16 @@ This is used to determine if `eldoc-idle-delay' is changed by the user.")
"The function used by `eldoc-message' to display messages.
It should receive the same arguments as `message'.")
(defun eldoc-edit-message-commands ()
(let ((cmds (make-vector 31 0))
(re (regexp-opt '("delete" "insert" "edit" "electric" "newline"))))
(mapatoms (lambda (s)
(and (commandp s)
(string-match-p re (symbol-name s))
(intern (symbol-name s) cmds)))
obarray)
cmds))
;;;###autoload
(define-minor-mode eldoc-mode
@ -168,25 +184,13 @@ expression point is on."
(setq eldoc-last-message nil)
(if eldoc-mode
(progn
(when eldoc-print-after-edit
(setq-local eldoc-message-commands (eldoc-edit-message-commands)))
(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
(define-minor-mode eldoc-post-insert-mode nil
:group 'eldoc :lighter (:eval (if eldoc-mode ""
(concat eldoc-minor-mode-string "|i")))
(setq eldoc-last-message nil)
(let ((prn-info (lambda ()
(unless eldoc-mode
(eldoc-print-current-symbol-info)))))
(if eldoc-post-insert-mode
(add-hook 'post-self-insert-hook prn-info nil t)
(remove-hook 'post-self-insert-hook prn-info t))))
;; FIXME: This changes Emacs's behavior when the file is loaded!
(add-hook 'eval-expression-minibuffer-setup-hook 'eldoc-post-insert-mode)
(kill-local-variable 'eldoc-message-commands)
(remove-hook 'post-command-hook 'eldoc-schedule-timer t)
(remove-hook 'pre-command-hook 'eldoc-pre-command-refresh-echo-area t)))
;;;###autoload
(defun turn-on-eldoc-mode ()
@ -264,8 +268,10 @@ Otherwise work like `message'."
;; This doesn't seem to be required for Emacs 19.28 and earlier.
(defun eldoc-pre-command-refresh-echo-area ()
(and eldoc-last-message
(if (eldoc-display-message-no-interference-p)
(eldoc-message eldoc-last-message)
(if (and (eldoc-display-message-no-interference-p)
(symbolp this-command)
(intern-soft (symbol-name this-command) eldoc-message-commands))
(eldoc-message eldoc-last-message)
(setq eldoc-last-message nil))))
;; Decide whether now is a good time to display a message.
@ -283,9 +289,7 @@ Otherwise work like `message'."
;; Check various conditions about the current environment that might make
;; it undesirable to print eldoc messages right this instant.
(defun eldoc-display-message-no-interference-p ()
(and eldoc-mode
(not executing-kbd-macro)
(not (and (boundp 'edebug-active) edebug-active))))
(not (or executing-kbd-macro (bound-and-true-p edebug-active))))
;;;###autoload
@ -309,7 +313,7 @@ Emacs Lisp mode) that support ElDoc.")
;; This is run from post-command-hook or some idle timer thing,
;; so we need to be careful that errors aren't ignored.
(with-demoted-errors "eldoc error: %s"
(and (or (eldoc-display-message-p) eldoc-post-insert-mode)
(and (eldoc-display-message-p)
(if eldoc-documentation-function
(eldoc-message (funcall eldoc-documentation-function))
(let* ((current-symbol (eldoc-current-symbol))