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bug#2989: implement bash's ignoredups

From: jidanni
Subject: bug#2989: implement bash's ignoredups
Date: Tue, 14 Apr 2009 08:00:17 +0800

M-p (translated from <escape> p) runs the command previous-history-element

Which gets rather frustrating when one runs into a long patch of the
same command, e.g.,

(compile "make" nil)
(compile "make" nil)
(compile "make" nil)

That's because emacs hasn't implement bash's ignoredups:


              ...value of
              ignoredups causes lines matching the previous history
              entry to not be saved...A value of erasedups
              causes all previous lines matching the current line to be
              removed from the history list before that line is saved.

Note I'm not talking about the *shell* buffer, but instead
repeat-complex-command's previous-history-element etc.

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