GNU bug report logs - #79884
shell-command-on-region: add timestamp option

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From: Dan Jacobson <jidanni@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: shell-command-on-region: add timestamp option
Date: Mon, 24 Nov 2025 03:39:56 +0800
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shell-command-on-region docstring says:

  Note that if ‘shell-command-dont-erase-buffer’ is non-nil,
  the echo area could display more than just the output of the
  last command.

In which case it becomes very hard to determine / remember if we are
looking at order 1 2 3 or 3 2 1 or even 3 1 2 output.

Therefore I hereby propose shell-command-on-region have a way to control
whether or not to prefix output with timestamps: t, nil, or a
date(1)-like format string.