Remove history entries

Remove history entries

[Jörg Sommer]

Hi,

is it possible to remove history entries? I would like to remove commands
didn't exist, i.e. their exit code is 127, in the precmd function. Is
this possible?

precmd()
{
    if [[ $? -eq 127 ]]
    then
        history drop -1
    fi
}

Bye, Jörg.
-- 
Was man mühelos erreichen kann, ist gewöhnlich nicht der Mühe wert,
erreicht zu werden.

Re: Remove history entries

[Bart Schaefer]

On Oct 12,  9:22pm, ( Text in unknown character set UTF-8 not shown )  wrote:
} 
} is it possible to remove history entries?

Sadly, no.  I'd like to be able to do this myself, particularly when
e.g. testing zsh completion, to remove all the goofy command fragments
and repetitions of "more /tmp/zsh99999ls13; : ls abc" that leak into
the history.

About the only thing I can think of would be to play some games in
which preexec runs "fc -p" and precmd runs "fc -P ; print -s ...".
That gets complicated quickly, because you don't want to push the
stack if the command is going to refer to the current history.

Re: Remove history entries

[Jörg Sommer]

Hallo Bart,

Bart Schaefer <schaefer@brasslantern.com> wrote:
> On Oct 12,  9:22pm, ( Text in unknown character set UTF-8 not shown )  wrote:
>} 
>} is it possible to remove history entries?
>
> Sadly, no.  I'd like to be able to do this myself, particularly when
> e.g. testing zsh completion, to remove all the goofy command fragments
> and repetitions of "more /tmp/zsh99999ls13; : ls abc" that leak into
> the history.

BTW: I find the idea to put the line ‘$PAGE /tmp/zsh…’ really good! It's
very helpful.

Bye, Jörg.
-- 
But in the case of "git revert", it should be an ancestor (or the user
is just insane, in which case it doesn't matter - insane people can do
insane things)
Linus Torvalds <alpine.LFD.1.00.0801041031590.2811@woody.linux-foundation.org>

Re: Remove history entries

[Richard Hartmann]

2008/10/12 Jörg Sommer <joerg@alea.gnuu.de>:

> is it possible to remove history entries? I would like to remove commands
> didn't exist, i.e. their exit code is 127, in the precmd function. Is
> this possible?

Didn't PWS add a hook for this, recently? I can't find it anywhere, though.


Richard

Re: Remove history entries

[Peter Stephenson]

On Tue, 14 Oct 2008 13:26:54 +0200
"Richard Hartmann" <richih.mailinglist@gmail.com> wrote:
> 2008/10/12 Jörg Sommer <joerg@alea.gnuu.de>:
> 
> > is it possible to remove history entries? I would like to remove commands
> > didn't exist, i.e. their exit code is 127, in the precmd function. Is
> > this possible?
> 
> Didn't PWS add a hook for this, recently? I can't find it anywhere, though.

zshaddhistory/zshaddhistory_functions: annoyingly, you can't use them for
quite this purpose.  You can veto adding history entries at the point
they're added, but that's before they're executed, so you don't have the
status.

It might be possible to force it to overwrite it, but I don't think that's
a simple change.

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070

Re: Remove history entries

[Richard Hartmann]

On Tue, Oct 14, 2008 at 13:43, Peter Stephenson <pws@csr.com> wrote:

> It might be possible to force it to overwrite it, but I don't think that's
> a simple change.

Can't you "just" move the hooks for these functions? And/or introduce
a new set?


Richard

Re: Remove history entries

[Peter Stephenson]

"Richard Hartmann" wrote:
> On Tue, Oct 14, 2008 at 13:43, Peter Stephenson <pws@csr.com> wrote:
> 
> > It might be possible to force it to overwrite it, but I don't think that's
> > a simple change.
> 
> Can't you "just" move the hooks for these functions? And/or introduce
> a new set?

No, the hook has to run before the line is saved.  Delaying saving it
until other code has run breaks the current model for how history code
works.  In particular executing history commands within the executed but
unsaved command would be screwed up.  There may be a fix, but I don't
see an easy fix.

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070