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bug#20626: Wishlist: M-x shell-command-on-rectangle-region

From: Juri Linkov
Subject: bug#20626: Wishlist: M-x shell-command-on-rectangle-region
Date: Fri, 22 May 2015 01:47:52 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (x86_64-pc-linux-gnu)

> Wishlist:
> M-x shell-command-on-rectangle-region

As you can see in bug#20070, the effort to make commands rectangleable
had stalled some time ago due to the need to decide how to handle
backward-compatibility of the existing region arguments, e.g. in

  (shell-command-on-region START END COMMAND &optional OUTPUT-BUFFER REPLACE
                           ERROR-BUFFER DISPLAY-ERROR-BUFFER)

how to send the boundaries of the rectangular region in START and END.

One idea is to handle it like recently we handled backward-compatibility
for saving dired positions in saveplace.el where we used a new format like

  ("~" (dired-filename . "~/.emacs.d/places"))

Using something like this means sending the rectangular bounds
either in START or END in the new format like

  (rect (1 . 2) (3 . 4))

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