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[Emacs-diffs] Changes to emacs/lisp/simple.el


From: Richard M . Stallman
Subject: [Emacs-diffs] Changes to emacs/lisp/simple.el
Date: Tue, 29 Mar 2005 15:53:19 -0500

Index: emacs/lisp/simple.el
diff -c emacs/lisp/simple.el:1.703 emacs/lisp/simple.el:1.704
*** emacs/lisp/simple.el:1.703  Tue Mar 29 04:55:43 2005
--- emacs/lisp/simple.el        Tue Mar 29 20:53:19 2005
***************
*** 35,40 ****
--- 35,47 ----
    (autoload 'widget-convert "wid-edit")
    (autoload 'shell-mode "shell"))
  
+ (defcustom idle-update-delay 0.5
+   "*Idle time delay before updating various things on the screen.
+ Various Emacs features that update auxiliary information when point moves
+ wait this many seconds after Emacs becomes idle before doing an update."
+   :type 'number
+   :group 'display
+   :version "22.1")
  
  (defgroup killing nil
    "Killing and yanking commands."
***************
*** 2218,2223 ****
--- 2225,2266 ----
    (reset-this-command-lengths)
    (restore-overriding-map))
  
+ (defvar buffer-substring-filters nil
+   "List of filter functions for `filter-buffer-substring'.
+ Each function must accept a single argument, a string, and return
+ a string.  The buffer substring is passed to the first function
+ in the list, and the return value of each function is passed to
+ the next.  The return value of the last function is used as the
+ return value of `filter-buffer-substring'.
+ 
+ If this variable is nil, no filtering is performed.")
+ 
+ (defun filter-buffer-substring (beg end &optional delete)
+   "Return the buffer substring between BEG and END, after filtering.
+ The buffer substring is passed through each of the filter
+ functions in `buffer-substring-filters', and the value from the
+ last filter function is returned.  If `buffer-substring-filters'
+ is nil, the buffer substring is returned unaltered.
+ 
+ If DELETE is non-nil, the text between BEG and END is deleted
+ from the buffer.
+ 
+ Point is temporarily set to BEG before caling
+ `buffer-substring-filters', in case the functions need to know
+ where the text came from.
+ 
+ This function should be used instead of `buffer-substring' or
+ `delete-and-extract-region' when you want to allow filtering to
+ take place.  For example, major or minor modes can use
+ `buffer-substring-filters' to extract characters that are special
+ to a buffer, and should not be copied into other buffers."
+   (save-excursion
+     (goto-char beg)
+     (let ((string (if delete (delete-and-extract-region beg end)
+                     (buffer-substring beg end))))
+       (dolist (filter buffer-substring-filters string)
+         (setq string (funcall filter string))))))
+ 
  ;;;; Window system cut and paste hooks.
  
  (defvar interprogram-cut-function nil
***************
*** 2394,2400 ****
  text.  See `insert-for-yank'."
    (interactive "r")
    (condition-case nil
!       (let ((string (delete-and-extract-region beg end)))
        (when string                    ;STRING is nil if BEG = END
          ;; Add that string to the kill ring, one way or another.
          (if (eq last-command 'kill-region)
--- 2437,2443 ----
  text.  See `insert-for-yank'."
    (interactive "r")
    (condition-case nil
!       (let ((string (filter-buffer-substring beg end t)))
        (when string                    ;STRING is nil if BEG = END
          ;; Add that string to the kill ring, one way or another.
          (if (eq last-command 'kill-region)
***************
*** 2430,2437 ****
  system cut and paste."
    (interactive "r")
    (if (eq last-command 'kill-region)
!       (kill-append (buffer-substring beg end) (< end beg))
!     (kill-new (buffer-substring beg end)))
    (if transient-mark-mode
        (setq deactivate-mark t))
    nil)
--- 2473,2480 ----
  system cut and paste."
    (interactive "r")
    (if (eq last-command 'kill-region)
!       (kill-append (filter-buffer-substring beg end) (< end beg))
!     (kill-new (filter-buffer-substring beg end)))
    (if transient-mark-mode
        (setq deactivate-mark t))
    nil)
***************
*** 5184,5197 ****
        (message "Delete key deletes %s"
               (if normal-erase-is-backspace "forward" "backward"))))
  
- (defcustom idle-update-delay 0.5
-   "*Idle time delay before updating various things on the screen.
- Various Emacs features that update auxiliary information when point moves
- wait this many seconds after Emacs becomes idle before doing an update."
-   :type 'number
-   :group 'display
-   :version "22.1")
- 
  (defvar vis-mode-saved-buffer-invisibility-spec nil
    "Saved value of `buffer-invisibility-spec' when Visible mode is on.")
  
--- 5227,5232 ----




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