Re: [PATCH] Add option to remove duplicate command history entries

[Eli Zaretskii <eliz@gnu.org>]

> From: Patrick Palka <patrick@parcs.ath.cx>
> Cc: Patrick Palka <patrick@parcs.ath.cx>
> Date: Fri, 19 Jun 2015 19:33:41 -0400
> 
> This patch implements the new option "history remove-duplicates", which
> controls the removal of duplicate history entries ("off" by default).
> 
> The motivation for this option is to be able to reduce the prevalence of
> basic commands such as "up" and "down" in the history file.  These
> common commands crowd out more unique commands in the history file (when
> the history file has a fixed size), and they make navigation of the
> history file via ^P, ^N and ^R more inconvenient.
> 
> The option takes an integer denoting the number of history entries to
> look back at for a history entry that is a duplicate of the latest one.
> "history remove-duplicates 1" is equivalent to bash's ignoredups option,
> and "history remove-duplicates unlimited" is equivalent to bash's
> erasedups option.
> 
> [ I decided to go with this integer approach instead of a tri-state enum
>   because it's slightly more flexible and seemingly more intuitive than
>   leave/erase/ignore.  ]
> 
> gdb/ChangeLog:
> 
> 	* NEWS: Mention the new option "history remove-duplicates".
> 	* top.c (history_remove_duplicates): New static variable.
> 	(show_history_remove_duplicates): New static function.
> 	(gdb_add_history): Conditionally remove duplicate history
> 	entries.
> 	(init_main): Add "history remove-duplicates" option.
> 
> gdb/doc/ChangeLog:
> 
> 	* gdb.texinfo (Command History): Document the new option
> 	"history remove-duplicates".
> 
> gdb/testsuite/ChangeLog:
> 
> 	* gdb.base/history-duplicates.exp: New test.

OK for the documentation parts.

Thanks.