Multi-threaded console apps

What's the best way to do something like an IRC client where there's messages coming from the network you'll want to display without interrupting the user's input.

I'm using a toy language (MzScheme), so I don't have easy access to some curses library or ptys or anything like that...

Any ideas, or should I just give up and write a curses wrapper?  Can GNU Readline do anything like this?

sage this shit

sage

Fuck you.

back to /b/, please

>>5
Forgot your sage.

Oh, I haven't read SICP, and I won't do it because I don't read programming books.

The reason I'm using Scheme... well, I started the app off with C, and wanted GNU Guile scripting but had some problems with threading, and thought I might just write it in Scheme instead :/

>>8
No. You are not welcome here. Gtfo.

>>8
No. You are not welcome here. Gtfo.

>>10
Hi, been a long time lurker on this board.. but I feel I have to speak out at this moment.

Never on The 4Chan Programming board have I seen someone be so horrible and with no provocation, utterly appalling.

that was uncalled for and just plain rude.

>>8
http://hackage.haskell.org/cgi-bin/hackage-scripts/package/hscurses-1.3

http://www.haskell.org/ghc/docs/latest/html/libraries/network/Network.html

http://www.haskell.org/ghc/docs/latest/html/libraries/base/Control-Concurrent.html

Funny you saged this thread so much while you all still reply to even worse threads without a sage.

>>12
I was considering Haskell, but I'd really like REPL during execution for this project.  Also, Haskell isn't very fun when it comes to bits and shit.  (Scheme isn't much better.)

>>11
Visit us on #sicp at EFnet and we can discuss your problem together. These heartless morons are useless.

>>2-7,9-11
A thread actually about programming, and you respond with sages and irrelevant memes. I don't care if I've been trolled, beet tolled or bean rolled, you suck.

>>16
Sage for whining

>>14
bits and shit
What is that?

I wrote a simple multithreaded IRC server in Haskell: http://monkeyboy.td.org.uit.no/~cin/code/hircd/

You can use hsplugins for a REPL. Or you could link to the greasespot Javascript library and script your IRC client with Javascript.

But, if you really want to use Scheme, threading and networking is easy, I've also written an IRCd in Scheme, too. Finding an ncurses wrapper would be your biggest issue. If you can't find one, you can probably write a simple ncurses wrapper library in C and control it from Scheme in a more high-level fashion.

you could have two threads per irc connection: one for reading
the input and one for reading the output

mzscheme is a decent scheme interpreter, i wouldn't give up on
it just yet (it has a great helpdesk, mred might be relevant).
you could easily build a very extensible IRC client with
it. i'm dreaming of something like this right now:

ENTERPRISE SCHEME IRC CLIENT

/join #prog
/(eval-command (lookup "join") (list "#prog"))

hello
/(privmsg "#prog" "hello")
/(raw "PRIVMSG #prog :hello")

/(add-handler 'on-privmsg (lambda (source target msg) ...)

/(map (lambda (x)
        (if (not (eq? x (me)))
          (kick "#thread" x "GTFO")
          '()))
      (inhabitants "#thread"))

i admit it would be more [i]l33t[i] to run
it through a terminal, but this would involve a lot more work.
you can do this later, i'd start off with a small gui in mred
(especially if you don't have any experience with scheme).

>>17
rage for saging

Sage this shit. Why are you replying to this shit thread?

>>18
Or just use Python, which would give you a REPL, too.

Or use Chicken Scheme:

http://chicken.wiki.br/ncurses

http://chicken.wiki.br/irc

>>21
Seconded

Sage

>>21,23
Go away. You should be able to ignore it if it bothers you, being so busy making interesting and stimulating discussions elsewhere.

>>18
bits and shit
What is that?
Well, first I have to decompress the Huffman-compressed packets I receive, then I have to find the correct bytes in the packets and flip the byte order (but not in all cases).

As for the input issue... it seems readline can do this somehow, but it'll require some hacking, at least creating a custom output port I think.

http://tiswww.case.edu/php/chet/readline/readline.html#SEC35

>>19
You could do that purely from a REPL inside DrScheme.

>>26
You should use STM. Is the REPL that important? Haskell's HsPlugins could provide that. Using STM would do the operations atomically, meaning you could use one input port after all.

>>28
Not only do I want a REPL for easy hacking, I also want easy scripting.  Haskell isn't Desktop-ready yet.

you don't have to multithread an irc client, everything sent from the irc-server is line for line, even stuff in other channels, you just put it in the correct channel buffer by looking at which channel it belongs to PRIVMSG #channel

>>30
multiple servers

>>31
man select

>>32
maybe I don't want to use select. maybe I like threads

>>33
Now you have two problems

>>34
Now you  have     to  follow this   with    your     mouse to REVEAL my answer: _    __________I HAVE BEEN TROLLING YOU AND THE SUSSMAN ALL ALONG

>>35
No I don't. All your spoilers are revealed for I use w3m.

>>36
YOU ARE A BARE-FACED LIAR _{and I am using a pocket calculator that I made into a LISP Machine^tm.}

>>35
All I have to do is highlight the text and it's revealed. Alternatively, since I'm using the Opera browser (www.opera.com) I can disable stylesheets and I can see your text.

www.opera.com

>>38
All I have to do is highlight the text and it's revealed.
THANKS FER THE TIP I NEVER REALIZZARD ~IT PROBABLY DUSNT WORK IN MY BROWSER OR ANYTHING<sup>1

1</sup> www.getfirefox.com

>>39
I regret to inform you but you are using an inferior browser.

www.opera.com

WHAT MEANS wwæø».com? PERHAPS YOUR BROWSER'S ENCODING IS INCORRECT

there's messages coming from the network you'll want to display without interrupting the user's input
Use erlang, faggot. I can't imagine you're even thinking about something else.

>>42
Wouldn't that be a bit overkill?

>>43
No.

>>37
somebody's been practicing their bbcode more than their programming

select > threads in this case

>>42


*** Peter has joined #erlang
[14:16] <John> Hello Peter
[14:16] <Peter> Hello John
[14:17] <Steve> Hello Peter
[14:17] <John> Hello Steve
[14:18] <Peter> Hello Steve

>>45
BBCODE is /prog/ramming.

>>45
Exactly how would you do the terminal input with select?

Launch one thread that keep read()'ing the socket.

AND YOU'RE DONE !

>>49
I implemented that (the actual thread is the REPL), and it does break input, as I expected.  I haven't been able to get the readline functions I linked above to do anything worthwhile :/

> (0) Demon Arkanis: yo
(0) Demon Arkanis: i just killed wylan
(0) Spinalfury: hey
(0) Spinalfury: nice
(0) Spinalfury: lol
(0) Spinalfury: he was pissed im sure
(0) Demon Arkanis: he was afk macroing in his house and had a macro to heal himself
(0) Spinalfury: hey
(0) Demon Arkanis: so i got 3 characters and set up macros to throw GE's and cast earthquake
(0) Demon Arkanis: at same time

(for-each
  (lambda (x)
    (sleep 3)
    (action-say x)) ; delicious side-effects
  '("HAHAHAHAHAHAHAHHAHAHAHAAHAHAAAA!!!"
  "you think your tough huh?"
  "two words Sussman and Abelson."
  "i have written two programming books at the same time in less than 5 seconds i have been training for 3 years."
  "also SICP,On Lisp,and TAoCP."
  "you might be stronger than me,but i know im smarterer and quicker with shift-0."
  "i only weigh 130 pounds pure lean parentheses."
  "one argument you'll be on your way to reread SICP."
  "your the one whose a homo.i can get Julie Sussman anytime i want you probably haven't ever been laid before."
  "you probably have sex with your REPL."
  "you don't even know me,and you don't want to."
  "you'll be lucky if your even worth the apply one lambda and you'll recurse forever."
  "though i'd be hapy to humiliate you in front of all your friends."
  "btw IM the best."
  "i have trolled in Slashdot, Reddit, Digg,paulgraham.com, Craigslist,MIT,world4chan.org."
  "never lost an internet fight!"
  "im undefeated in competitive forced indentation/parenthesis counting."
  "im on my way to Nirvana."
  "go ahead and come step anytime you want.b*tch"))

All right, I seem to have tamed readline:

  puts("\e[M\rasd");          /* clear line, go to beginning of line, output asd, go to next line */
  rl_forced_update_display(); /* this redraws the readline prompt, nothing else works with the above commands */

Now I'll just have to see if this works as well with MzScheme's readline wrapper, and how to automatically do this when outputting text.

Hm, it does work, I suppose... but when you execute some commands, shit happen :)

(define rl-forced-update-display
  (get-ffi-obj "rl_forced_update_display" libreadline (_fun -> _void)))

(define (messagef format . args)
  (display "\e[M\r")
  (apply printf (cons format args))
  (newline)
  (rl-forced-update-display))

Good enough for now.

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