[erlang-questions] How to disable parentheses matching in Erlang shell?

Joshua Barney <>
Sun May 15 22:28:53 CEST 2016


Grzegorz,

that’s a long list of environments!

I took some time to reproduce the “Ubuntu ssh to CentOS” (and vice versa) using vmware. on two fresh installs of ubuntu and centos, the paren matching worked correctly. On ubuntu, If I resized the window halfway through it would jump backwards to the wrong point and then forwards to the correct point—centos xterm re-flowed the text so this did not happen. This worked with $TERM set to 'xterm' or ‘konsole’ or ‘putty’.

you said earlier:
>>> I don't have such environment variables (LINES and COLUMNS) in my system and I don't remember having them on Ubuntu or Red Hat (however I can't double-check that now)

These variables are set by your terminal in response to resize events and are communicated over ssh as you can read about here: http://unix.stackexchange.com/a/207802 <http://unix.stackexchange.com/a/207802>
If your system does not have those variables, I would strongly suspect that the nurses library would not function in the way you desire.

At this point I can only wildly speculate about ways your erlang install (or terminfo database, or ncurses library) is broken, and I don’t think you’re really looking for that.

Josh

> On May 15, 2016, at 8:00 AM, Grzegorz Junka <> wrote:
> 
> Joshua,
> 
> This is what I said, it isn't broken only for me. I saw it being broken on other people's computers as well.
> 
> It's unlikely for any scripts to set COLUMNS since I don't see that environment variable being set when running shell.
> 
> I am running Konsole on the same system on which I am running Erlang, both on FreeBSD. I don't need to SSH anywhere. But the behaviour was the same no matter from where or to where I was SSH-ing or not (or someone I saw doing it), e.g.:
> 
> Windows putty SSH to FreeBSD
> 
> Windows putty SSH to Ubuntu
> 
> Windows putty SSH to Red Hat
> 
> Windows putty SSH to CentOS
> 
> Windows xterm cygwin SSH to FreeBSD
> 
> Windows xterm cygwin SSH To Ubuntu
> 
> Windows xterm cygwin SSH to Red Hat
> 
> Windows xterm cygwin SSH to CentOS
> 
> FreeBSD xterm SSH to Ubuntu
> 
> FreeBSD Konsole SSH to Ubuntu
> 
> FreeBSD xterm SSH to FreeBSD
> 
> FreeBSD Konsole SSH to Ubuntu
> 
> FreeBSD xterm SSH to CentOS
> 
> FreeBSD Konsole SSH to CentOS
> 
> FreeBSD Konsole and Erlang shell on the same system (no SSH)
> 
> FreeBSD xterm end Erlang shell on the same system (no SSH)
> 
> Ubuntu SSH to CentOS
> 
> It's fair to say that I haven't see a system on which this feature worked fine, I just learned to not type commands that are too long or copy-paste longer commands, and I bet most people who experience it do the same and don't bother complaining. I wonder if maybe this has something to do with escape codes and for example support for 256 colors in the terminal.
> 
> Grzegorz
> 
> 
> On 14/05/2016 22:49, Joshua Barney wrote:
>> It seems unlikely that erlang shell is broken only for you on all these systems.
>> Have you checked that your shell scripts are not setting COLUMNS? Perhaps you are ssh-ing from a client that is doing something not quite right?
>> 
>> Sent from my iPhone
>> 
>>> On May 14, 2016, at 6:39 PM, Grzegorz Junka <> wrote:
>>> 
>>> 
>>>> On 14/05/2016 21:19, Kenneth Lakin wrote:
>>>>> On 05/14/2016 03:32 AM, Grzegorz Junka wrote:
>>>>> Fixing my terminal to 80 characters only seems like taken straight from
>>>>> the Windows world. I hope Erlang can do better ;)
>>>> If ncurses can't determine your terminal size, then falling back to
>>>> 80x24 makes a lot of sense. Do other ncurses-based programs behave
>>>> incorrectly?
>>> No. Everything else is fine. This problem is not related to my system, as I have seen the same behaviour in Erlang running on FreeBSD, Ubuntu, Red Hat and CentOS in different terminals, like putty, cygwin and Konsole.
>>> 
>>>>> Is there any way of
>>>>> telling the Erlang terminal how wide is my terminal, e.g. an environment
>>>>> variable?
>>>> On my system, it looks like the environment variables LINES and COLUMNS
>>>> correspond to the current size of my terminal window. When I set COLUMNS
>>>> to a value that does not match the window's current size, then the
>>>> Erlang shell's paren matching bounces the cursor backwards to the wrong
>>>> place (but back forwards to the right place). Maybe this will be the
>>>> band-aid you need.
>>> I don't have such environment variables in my system and I don't remember having them on Ubuntu or Red Hat (however I can't double-check that now)
>>> 
>>>> However, it might be more useful to fix whatever is preventing ncurses
>>>> from determining the terminal size.
>>> Yeah, and even more useful if the Erlang shell allowed me to disable a feature that isn't really necessary especially if it isn't working correctly.
>>> 
>>> 
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>>> 
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> 
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