Re: [Haskell-cafe] Interactive chatbot
No worries, I'd rather have it twice than not at all :-) Thank you all for the helpful tipps. We ended up knowing a lot more about Haskell. The easiest solution however, was to compile it all into an application - tadaa, deleting works as wished for. Regards, Torsten Am 05.11.2009 um 02:00 schrieb Ben Millwood: Oops, I clicked reply instead of reply to all. Duplicating the message below. I suppose this means someone is going to get two copies of this. Sorry someone! On Thu, Nov 5, 2009 at 12:56 AM, Ben Millwood hask...@benmachine.co.uk wrote: On Wed, Nov 4, 2009 at 10:21 PM, Torsten Otto t-otto-n...@gmx.de wrote: When we read the user's input through t - getLine it is not possible to delete typos before hitting enter and thereby sending the input off to the system (at least in OS X, bash). I didn't find that terribly problematic, but of course it is a bit of a show stopper from their point of view. As people have said it's worth checking what buffering settings you are using (especially note that ghci changes some interesting settings in relation to how input is handled, and compiled code may behave differently), but it might also be worth checking the terminal application's preferences to see if there are settings related to the interpretation of the backspace key that you need to twiddle one way or the other. In particular, if you are finding that pressing delete makes ^H appear on the input line instead of deleting things, or if pressing ctrl-H deletes stuff where the delete key fails to do so, it might be a problem with your terminal rather than with your program. This is only based on what I vaguely remember from faffing with the Mac Terminal application some time ago when it wouldn't co-operate with screen, but it may be worth a look. yours, Ben Millwood ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Interactive chatbot
Hi! My students have the task to program an interactive chatbot. We have run into a problem that I can't solve either: When we read the user's input through t - getLine it is not possible to delete typos before hitting enter and thereby sending the input off to the system (at least in OS X, bash). I didn't find that terribly problematic, but of course it is a bit of a show stopper from their point of view. The input is then used to generate a reply in purely functional code, and the reply sent to the command line via putStr. Is there a more clever way to interact with the user that would allow editing ones text before sending it to the bot? I guess we could try with a website, but don't know off hand how to do that, either, although I've seen beautiful webservers made in Haskell... Regards, Torsten Otto ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Interactive chatbot
The library at http://hackage.haskell.org/package/readline might solve your problem. Cheers, Greg On Nov 4, 2009, at 2:21 PM, Torsten Otto wrote: Hi! My students have the task to program an interactive chatbot. We have run into a problem that I can't solve either: When we read the user's input through t - getLine it is not possible to delete typos before hitting enter and thereby sending the input off to the system (at least in OS X, bash). I didn't find that terribly problematic, but of course it is a bit of a show stopper from their point of view. The input is then used to generate a reply in purely functional code, and the reply sent to the command line via putStr. Is there a more clever way to interact with the user that would allow editing ones text before sending it to the bot? I guess we could try with a website, but don't know off hand how to do that, either, although I've seen beautiful webservers made in Haskell... Regards, Torsten Otto ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Interactive chatbot
On Wed, Nov 4, 2009 at 2:21 PM, Torsten Otto t-otto-n...@gmx.de wrote: Hi! My students have the task to program an interactive chatbot. We have run into a problem that I can't solve either: When we read the user's input through t - getLine it is not possible to delete typos before hitting enter and thereby sending the input off to the system (at least in OS X, bash). Why reinvent the shell? Is the program not setup in such a way as to make the ShellAC package a useful solution? I see someone already chimed in with readline. You might want to look at haskeline too, if you go that path (both are a step lower than ShellAC wrt abstraction). Thomas ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Interactive chatbot
On Wed, Nov 4, 2009 at 2:21 PM, Torsten Otto t-otto-n...@gmx.de wrote: Hi! My students have the task to program an interactive chatbot. We have run into a problem that I can't solve either: When we read the user's input through t - getLine it is not possible to delete typos before hitting enter and thereby sending the input off to the system (at least in OS X, bash). I didn't find that terribly problematic, but of course it is a bit of a show stopper from their point of view. Is it possible that you need to tweak the input buffering settings? http://haskell.org/ghc/docs/latest/html/libraries/base/System-IO.html#v:hSetBuffering You probably want to look at 'interact' also. Or just switch to readline as others have suggested. Jason ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Interactive chatbot
On Wed, Nov 4, 2009 at 3:14 PM, Jason Dagit da...@codersbase.com wrote: On Wed, Nov 4, 2009 at 2:21 PM, Torsten Otto t-otto-n...@gmx.de wrote: Hi! My students have the task to program an interactive chatbot. We have run into a problem that I can't solve either: When we read the user's input through t - getLine it is not possible to delete typos before hitting enter and thereby sending the input off to the system (at least in OS X, bash). I didn't find that terribly problematic, but of course it is a bit of a show stopper from their point of view. Is it possible that you need to tweak the input buffering settings? http://haskell.org/ghc/docs/latest/html/libraries/base/System-IO.html#v:hSetBuffering You probably want to look at 'interact' also. Or just switch to readline as others have suggested. Jason Another possibility (perhaps simpler) is to use an external program such as rlwrap to handle input. Shachaf ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Interactive chatbot
Oops, I clicked reply instead of reply to all. Duplicating the message below. I suppose this means someone is going to get two copies of this. Sorry someone! On Thu, Nov 5, 2009 at 12:56 AM, Ben Millwood hask...@benmachine.co.uk wrote: On Wed, Nov 4, 2009 at 10:21 PM, Torsten Otto t-otto-n...@gmx.de wrote: When we read the user's input through t - getLine it is not possible to delete typos before hitting enter and thereby sending the input off to the system (at least in OS X, bash). I didn't find that terribly problematic, but of course it is a bit of a show stopper from their point of view. As people have said it's worth checking what buffering settings you are using (especially note that ghci changes some interesting settings in relation to how input is handled, and compiled code may behave differently), but it might also be worth checking the terminal application's preferences to see if there are settings related to the interpretation of the backspace key that you need to twiddle one way or the other. In particular, if you are finding that pressing delete makes ^H appear on the input line instead of deleting things, or if pressing ctrl-H deletes stuff where the delete key fails to do so, it might be a problem with your terminal rather than with your program. This is only based on what I vaguely remember from faffing with the Mac Terminal application some time ago when it wouldn't co-operate with screen, but it may be worth a look. yours, Ben Millwood ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
