problem with echo prompting in ghci (visible in emacs)
conal at conal.net
Mon Nov 17 10:56:28 EST 2008
Thanks very much, Judah!
Given this info, there's a fairly easy emacs haskell-mode work-around. I
made a shell script "ghci-no-tty" in my ~/bin that contains
# So ghci+readline won't echo input
cat | /usr/local/bin/ghci $*
and used "M-x customize-group" with the "haskell" group to set the "Haskell
Program Name" variable to "/home/conal/bin/ghci-no-tty" (must be full path).
Now there's no more input echoing, and commands like automatic signature
insertion ("\C-c\C-t") work again.
On Sun, Nov 16, 2008 at 10:31 PM, Judah Jacobson
<judah.jacobson at gmail.com>wrote:
> 2008/11/16 Conal Elliott <conal at conal.net>:
> > I'm still looking for a solution to this problem. I've heard from a few
> > people who are affected also, but not any solution.
> > Barring a solution to ghci's behavior, does someone have an emacs-based
> > workaround?
> > - Conal
> > On Tue, Nov 11, 2008 at 4:41 PM, Conal Elliott <conal at conal.net> wrote:
> >> ghci echoes all of my input in emacs, when run via haskell-mode or via
> >> "M-x shell", which then confuses various useful haskell-mode features.
> >> built it from sources. At the time I didn't have libedit-dev, so today
> >> installed libedit-dev (version 2.11~20080614 on ubuntu), did a clean
> make &
> >> install, and I get exactly the same behavior.
> >> Does anyone have experience in getting through this problem? Willing to
> >> help me out?
> >> Thanks,
> >> - Conal
> Hi Conal,
> The problem is that eshell tells subprocesses that they're running in
> a terminal (e.g., when queried via hIsTerminalDevice), but always
> echos user input itself regardless of the tty's ECHO attribute. This
> confuses libedit, which assumes that if it's connected to a terminal
> then it can turn off echoing in order to run its own rich line editor.
> In "M-x shell", you can work around this issue by starting ghci with,
> for example, "cat | ghci" to prevent ghci and libedit from trying to
> run as if in a terminal. Probably something similar could be done for
> haskell-mode; I'm not familiar enough with emacs to fix it myself.
> Incidentally, googling revealed that zsh has a similar issue:
> http://www.zsh.org/mla/users/2001/msg00014.html (section 3.10)
> Hope that helps,
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