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Re: TAB when the region is active

From: Lennart Borgman (gmail)
Subject: Re: TAB when the region is active
Date: Tue, 18 Sep 2007 00:40:02 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20070728 Thunderbird/ Mnenhy/

Richard Stallman wrote:
      > The idea is logical, but we need to ask users if they find the change
      > annoying.

    Given that we are not close to a release, this would be a good time to
    experiment.  Can you please OK such a change?

I will ok trying it, if you agree to follow up in a few weeks
by reminding people to try it and say if they don't like it.

The code below is what I currently use. There are some problems I know about:

- I do not remember what Drew wanted to add (in another message).

- indent-according-to-mode is not supported everywhere.

BTW, there is another problem with the indentation functions. I believe it would be useful (at least in mumamo.el) if the function that indents a line where split into one that gives the indentation amount and one that does the indentation (for every major mode).

(defun indent-line-or-region ()
  "Indent line or region.
Only do this if indentation seems bound to \\t.

Call `indent-region' if region is active, otherwise
  ;; Do a wild guess if we should indent or not ...
  (let* ((indent-region-mode)
         (t-bound (key-binding [?\t])))
    (if (not
           (string-match "indent" (symbol-name t-bound))))
        (call-interactively t-bound t)
      (if (and mark-active ;; there is a visible region selected
          (indent-region (region-beginning) (region-end))
        (indent-according-to-mode))))) ;; indent line

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