;;; indent.el --- indentation commands for Emacs
;; Copyright (C) 1985, 1995, 2001, 2002, 2003, 2004,
-;; 2005, 2006, 2007 Free Software Foundation, Inc.
+;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
;; Maintainer: FSF
Depending on `tab-always-indent', either insert a tab or indent.
If initial point was within line's indentation, position after
the indentation. Else stay at same point in text.
+
+If a prefix argument is given, also rigidly indent the entire
+balanced expression which starts at the beginning the current
+line to reflect the current line's change in indentation.
+
If `transient-mark-mode' is turned on and the region is active,
-indent the region.
+indent the region (in this case, any prefix argument is ignored).
+
The function actually called to indent the line is determined by the value of
`indent-line-function'."
- (interactive "p")
+ (interactive "P")
(cond
;; The region is active, indent it.
- ((and arg transient-mark-mode mark-active
+ ((and transient-mark-mode mark-active
(not (eq (region-beginning) (region-end))))
(indent-region (region-beginning) (region-end)))
((or ;; indent-to-left-margin is only meant for indenting,
(or (> (current-column) (current-indentation))
(eq this-command last-command))))
(insert-tab arg))
- ;; Those functions are meant specifically for tabbing and not for
- ;; indenting, so we can't pass them to indent-according-to-mode.
- ((memq indent-line-function '(indent-relative indent-relative-maybe))
- (funcall indent-line-function))
- ;; Indent the line.
(t
- (indent-according-to-mode))))
+ (let ((end-marker
+ (and arg
+ (save-excursion
+ (forward-line 0) (forward-sexp) (point-marker))))
+ (old-indent
+ (current-indentation)))
+
+ ;; Indent the line.
+ (funcall indent-line-function)
+
+ ;; If a prefix argument was given, rigidly indent the following
+ ;; sexp to match the change in the current line's indentation.
+ ;;
+ (when arg
+ (let ((indentation-change (- (current-indentation) old-indent)))
+ (unless (zerop indentation-change)
+ (save-excursion
+ (forward-line 1)
+ (when (< (point) end-marker)
+ (indent-rigidly (point) end-marker indentation-change))))))))))
(defun insert-tab (&optional arg)
(let ((count (prefix-numeric-value arg)))