More default Emacs bindings

[viritrilbia]

In Emacs mode I would expect the following key-bindings to exist by default:

bind: ctrl-p up
bind: ctrl-n down
bind: ctrl-/ ctrl-_

[judah]

Thanks for the report! ctrl-p and ctrl-n have already been added in the development repo at http://code.haskell.org/haskeline .

I wasn't aware of the ctrl-/ binding; and when I try to use it in bash I don't get an effect. What is its purpose, and is it set by default in readline or another line editor?

[viritrilbia]

ctrl-/ works for me in bash. It means "undo," the same as ctrl-_. But it's easier to type because _ requires the shift key but / doesn't.

[judah]

I looked into this; some terminals automatically translate Ctrl-/ into C-_. For example, search the Emacs tutorial for "C-_": http://braeburn.aquamacs.org/code/master/etc/tutorials/TUTORIAL

I tried this out on OS X. In the Terminal.app program, ctrl-/ is not recognized by the terminal itself. But xterm in the X11 program does translate C-/ to C-_. In fact, C-/ *does* work in haskeline for me in X11.

Is there an environment (xterm, urxvt, etc.) on your machine such that ctrl-/ works in bash but not in Haskeline? If so, what is the output when you run "ghc -e getLine", type ctrl-/ and then return?

[viritrilbia]

That's weird, now C-/ is working for me too in haskeline, at least anywhere it works in bash. I could swear it wasn't working before, though.

[judah]

OK, thanks for the update; I'll close this ticket. Please re-open it if you do find a case where haskeline doesn't work but bash does.