[erlang-questions] OTP R16A has been released

Pierre Fenoll <>
Thu Jan 31 00:14:11 CET 2013


Hi Fred!  and sorry to diverge this thread…
Why do you want a history file per erlshell? bash only uses one:
~/.bash_history
You only need one ~/.erlang.history, don't you?

On 31 January 2013 00:07, Fred Hebert <> wrote:

> That's what it is. It searches the line stack. It's a *history-search*
> patch, not a general history-saving patch.
>
> I have https://github.com/ferd/erlang-history that implements a search
> that can be saved, but there's still work to do in it before it can be
> good enough for OTP:
>
> 1. it relies on DETS, and DETS seems to corrupt files from time to time
>    either when too many shells write to it, or when it's interrupted
>    while dumping. I want to get rid of DETS at some point for some other
>    line utility, maybe disk_log.
> 2. I'll need to make it use a .erlang/ directory in $HOME rather than
>    plenty of .erlang.$NAME files. There's a truckload of .erlang.*
>    config files around, and one per named shell is problematic.
> 3. Multiple shells are implemented in an okay way, but there may be a
>    need to correct codes when many shells write to the same file
>    (usually multiple non-distributed shells).
> 4. The usual OTP cleanup and formatting is required.
> 5. I haven't considered the issue of multiple encodings used in the same
>    shell history file yet.
> 6. I haven't asked the OTP team what they think should be done at that
>    point, but I'd be fine forking this thread to start discussing it.
>
> Lately I haven't had the time/motivation to do that heavy lifting,
> but with the book and university done, I'll probably find time here and
> there to try and make a better implementation.
>
> In the mean time, I'll keep the repository above up to date. It's not
> yet ready for R16A support -- I use the compiler versions to deal with
> things and the new code can't be the same to make it there. It should
> work fine with the new ^R support feature.
>
> Shell history is a tiny bit about injecting history in a shell and is
> *mostly* about handling files on disk. Shell history search is pretty
> much handling the line stack in the shell and edlin, so that one was
> much simpler to deal with than history to make it part of OTP :)
>
> Regards,
> Fred.
>
> On 01/30, Motiejus Jakštys wrote:
> > On Wed, Jan 30, 2013 at 3:40 PM, Fred Hebert <> wrote:
> > > Also:
> > >
> > >   OTP-10739  Add search to Erlang shell's history. Thanks to Fred
> > >    Herbert.
> >
> > History between sessions is not implemented (I get readline-style
> > ctrl-r in same session fine which is super cool)?
> >
> > /home/motiejus$ erl -config hist.config -name labas
> > Erlang R16A (erts-5.10) [source] [smp:2:2] [async-threads:10] [hipe]
> > [kernel-poll:false]
> >
> > Eshell V5.10  (abort with ^G)
> > ()1> application:get_all_env(kernel).
> > [{hist_file,"erlang-history"},
> >  {included_applications,[]},
> >  {error_logger,tty},
> >  {hist_size,120},
> >  {hist_drop,["q().","init:stop()."]}]
> > ()2> q().
> > ok
> > ()3> %
> > /home/motiejus$ ls -lA | grep erlang
> > -r--------  1 motiejus motiejus      20 Rgp 23 23:00 .erlang.cookie
> >
> >
> > --
> > Motiejus Jakštys
> _______________________________________________
> erlang-questions mailing list
> 
> http://erlang.org/mailman/listinfo/erlang-questions
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://erlang.org/pipermail/erlang-questions/attachments/20130131/6a369d15/attachment.html>


More information about the erlang-questions mailing list