ANNOUNCE: GHC version 6.10.1 - EditLine / terminal incompatibility?

Jules Bean jules at
Fri Nov 21 06:06:22 EST 2008

Philip K.F. Hölzenspies wrote:
> On Friday 21 November 2008 10:49:47 Jules Bean wrote:
>> Philip Hölzenspies wrote:
>>> Also, there are no de facto escape sequences, because special keys (like
>>> function and arrow keys) have different sequences on different
>>> terminals. A useful tip that may be useful to include in the wiki is an
>>> easy trick that will help you find out your terminals escape sequences.
>>> I usually just like to start an application that has no editline or
>>> readline capabilities and press the keys. Telnet is one of my favorite
>>> applications for this purpose.
>> But this is abhorrent.
>> The whole point of the existence of termcap and libraries which build
>> upon it (ncurses, readline, editline, etc) is so that individual users
>> do not have to work out what the escape sequences produced by their
>> terminal are.
>> Something must be very very broken : surely it is not expected behaviour
>> for editline to need configuration in this way?
> One can call it broken, another will say users should settle for the default 
> behaviour. Neither readline, nor editline *need* configuration this way, 
> because they do come with sensible defaults. However, some people want custom 
> behaviour and they'll have to figure out how stuff works for their machine.

And suppose I log on from another machine with a different TERM setting? 
or just use a different terminal program?

This is broken.

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