October 2002 - Hugs-Users

Hugs, Mac OS X 10.1.5, and pathnames
by Hamilton Richards 20 Feb '03

20 Feb '03

In OS X, pathnames have two distinct syntaxes. The GUI uses the pre-X syntax, in which a pathname begins with a volume name and the separator is `:', as in Macintosh HD:Users:ham:Documents:whatever.hs In the Darwin (i.e., unix) command-line "underworld", a pathname begins with /Volumes, spaces are escaped with `\', and the separator is `/', as in /Volumes/Macintosh\ HD/Users/ham/Documents/whatever.hs When you drag a file icon onto the command line, Terminal does the right thing-- it converts the pathname from the GUI syntax to the Darwin syntax, and utilities such as more work just as they should. Hugs, however, doesn't do so well. For example, Prelude> :l /Volumes/Macintosh\ HD/Users/ham/Documents/whatever.hs Reading file "/Volumes/Macintosh\": ERROR "/Volumes/Macintosh\" - Unable to open file "/Volumes/Macintosh\" Quoting the pathname changes the problem, but doesn't cure it: Prelude> :l "/Volumes/Macintosh\ HD/Users/ham/Documents/whatever.hs" ERROR - Missing `\' terminating string literal gap Apparently what's confusing Hugs is the `\', because removing it cures the problem: Prelude> :l "/Volumes/Macintosh HD/Users/ham/Documents/whatever.hs" Reading file "/Volumes/Macintosh HD/Users/ham/Documents/whatever.hs": Is this problem unavoidable, or is it just an oversight? Thanks, --Ham -- ------------------------------------------------------------------ Hamilton Richards Department of Computer Sciences Senior Lecturer Mail Code C0500 512-471-9525 The University of Texas at Austin Taylor Hall 5.138 Austin, Texas 78712-1188 ham(a)cs.utexas.edu hrichrds(a)swbell.net ------------------------------------------------------------------

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hugs ffi - question thats been bugging me for some time
by R. Legere 30 Dec '02

30 Dec '02

In docs/ffi-notes.txt, I find the following: ------------------------------------------------------------ o foreign export static is not implemented. You can code around this by writing: foreign import dynamic foo_dynamic :: Addr -> (A -> B -> C) foreign label foo_addr :: Addr foo = foo_dynamic foo_addr instead of: foreign import foo :: A -> B -> C ------------------------------------------------------------------------- Does anyone understand what this is saying? I can't grok it. The work around presented here seems to have nothing to do with foriegn export static. It looks like a workaround to not having foreign IMPORT static. (Which we of course dont need a workaround for :)). Is something extremely tricky going on or am i just dense? Anyway, just curious, I have not had any trouble working around by passing pointers to the C-side using foreign export dynamic. I have just wondered about this for a long long time :)

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Re: Rational sequence
by Ross Paterson 27 Oct '02

27 Oct '02

In haskell-cafe, Alastair Reid wrote: > > Jerzy Karczmarczuk <karczma(a)info.unicaen.fr> writes: > > > Rationals in Hugs were always a bit obscure. What do you think, what > > is the Rational form of 2.3 ? (GHCi says 23/10). > > > The answer is: > > > 2589569785738035 % 1125899906842624 > > > (Old Hugs, Feb. 2001) > > I'm afraid the new release won't fix this. > > Once the release is out the door and things settle down a bit (both in > Hugs and in my personal life), I'd like to cleanup the Hugs' internals > which have gotten quite confused by layer upon layer of backward > compatability code. Practical benefits I hope for are: > > - Make Float mean 'C float' and Double mean 'C double'. > Most of the code is actually in Hugs already but it was disabled > because of some long-irrelevant issue involving the foreign > function interface. So it seems that double-precision can (and should) be re-enabled. Alastair (in another place) counsels caution. But it's my impression that several people are using a version of Hugs with USE_DOUBLE_PRECISION set to 1 (Jerzy clearly is) with no problems, so this should be safe. It also passes the Hugs test suite (modulo the extra precision). Any testimonials?

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FranTK installation
by Stephan Haugh 26 Oct '02

26 Oct '02

New to Haskell _and_ FranTK I am trying to install both. So far I have: 1. installed Hugs98 (seems to work) 2. installed TCL/TK (demos work fine) 3. installed FranTK that is were I am stuck. Since I am running Windows, I have modified tclhugs98.bat to point to the right directories. I have also 4. installed TclHaskell (demos work just fine) Has anybody managed to run the FranTK demo? I am grateful for any help . Cheers, Stephan

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3 KASIM
by Gen� Parti 26 Oct '02

26 Oct '02

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3 KASIM
by Gen� Parti 26 Oct '02

26 Oct '02

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"Fran" or "Functional Reactive Animation"
by Tomas Falemo 24 Oct '02

24 Oct '02

Hi, my name is Tomas Falemo and I'm a student at Chalmers University. I'm currently working on a Haskell project for a course in advanced fuinctional programming and I intend to build my project using Fran as a vital cornerstone. But now I seem to have run in to serious problem, namely I can't find Fran anywhere... All references I have found seems to end up at http://research.microsoft.com/~conal/fran/ which only yields a file-not-found exception. I've been told this is due to Conal Elliott leaving Microsoft, but that does not help me much. Now to my question, is there anyone out there who knows where I can find a copy of Fran? Best Regards, Tomas Falemo

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Fw: 3. PRE-Test
by alexander.siedl 24 Oct '02

24 Oct '02

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Hugs98 Oct2002 release candidate available
by Sigbjorn Finne 22 Oct '02

22 Oct '02

A new release of Hugs98 is just around the corner, introducing a number of worthwhile extensions and enhancements (see announcement blurb at the end of this message.) To help us flush out any remaining issues/bugs, a release candidate is now available for test use. The dev. team is very keen on having Hugs users try out this new release, and report back any issues they may into to hugs-bugs(a)haskell.org The release candidate is available in source form (and for the benefit of Win32 users, a binary distribution) from http://cvs.haskell.org/Hugs/downloads/Oct2002/ thanks --sigbjorn --------------------------------------------------------------------------- We are pleased to announce a new release of Hugs98, an interpreter and programming environment for developing Haskell programs. Sources and binaries are freely available on the World-Wide Web. Feature highlights of this new release are: - Much improved FFI support (contributed by Alastair Reid), bringing Hugs really very close to the Haskell FFI specification. - Adoption of a significant subset of GHC's hierarchical libraries (hard work contributed by Ross Paterson.) - An (allegedly) complete implementation of the Haskell98 module system. - Numerous bug fixes since the previous major release in Dec 2001. The home page for Hugs is at http://haskell.org/hugs. Send email to hugs-users-request(a)haskell.org to join the hugs-users mailing list. Bug reports should be sent to hugs-bugs(a)haskell.org. Send email to hugs-bugs-request(a)haskell.org to subscribe to the hugs-bugs list. ---------------------------------------------------------------------------- -- The Hugs 98 system is Copyright (c) Mark P Jones, Alastair Reid, the Yale Haskell Group, and the OGI School of Science & Engineering at OHSU, 1994-2002, All rights reserved. It is distributed as free software under the license in the file "License", which is included in the distribution. ---------------------------------------------------------------------------- --

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ncurses
by brian 21 Oct '02

21 Oct '02

O.k., I am really sorry for this because I am sure it has been asked before, I just can't find the answer. I installed HUGS on my iBook with OS10.1 and get a "dyld: hugs can't open library: /usr/lib/libncurses.5.dylib" error. I don't have libncurses.5.dylib on my system. I compiled ncurses but didn't get a dynamic lib so now what? Any help sure would be great. Thanks a bunch. Brian

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