Février 2009 - Gambit-list - mailman.iro.umontreal.ca

Bug involving syntax-rules and c-lambda
by David Rush 04 Fév '09

04 Fév '09

Hi there, I decided that it would be good to make sure that I am up-to-date with Gambit 4.4 before I posted my web framework here for those who have expressed an interest and I am finding a destructive interaction when using the c-lambda form. With the code in the sequel and Gambit 4.4.0, if I compile thusly: $ gsc -:s -link bug.gambit *** ERROR IN MAP -- invalid syntax () but it compiles fine if I omit the -:s option. Now obviously, the example does not require syntax-rules macros, but the full framework certainly does. Is there a known incompatibility here? The text concerning define-syntax hints at such a possibility, but the actual interaction is unclear. david -- GPG Public key at http://cyber-rush.org/drr/gpg-public-key.txt ; Null module for: Prelude (c-declare " #include <sys/time.h> #include <time.h> ") (c-define-type timeval (struct "timeval")) (c-define-type timeval* (pointer timeval)) (define make-timeval (c-lambda () timeval* "___result_voidstar = ___EXT(___alloc_mem)(sizeof(struct timeval));")) (define timeval.tv_sec (c-lambda (timeval*) int32 " ___result = ___arg1->tv_sec;")) (define timeval.tv_usec (c-lambda (timeval*) int32 "___result = ___arg1->tv_usec;"))

2 2

webapp
by lowly coder 02 Fév '09

02 Fév '09

hey all, i'm thinking of writing a webapp, the type generally written w/ ruby on rails; but with gambit scheme. given existing tools / termite, I wanted to see what suggestions people had (the frontend is mainly flash + asynch javascript based, the backend needs to run on ec2; I need some type of database, but I'm not particularly attached to mysql or postgresql) please tell me anything that may be useful thanks!

4 3

Re: [gambit-list] webframework
by Marc Feeley 02 Fév '09

02 Fév '09

On 30-Jan-09, at 10:41 PM, lowlycoder wrote: > can i write web apps using jazz scheme? if so, please give me some > pointers. thanks! You can also try out the Gambit web-server example in examples/web- server and there is also a web server on the Gambit dumping grounds which implements cookies and server pages (http://dynamo.iro.umontreal.ca/~gambit/wiki/index.php/Dumping_Grounds#Full_… ). Marc

2 2

reading list of symbols defined in top level
by lowly coder 01 Fév '09

01 Fév '09

suppose I have test.scm: (define (foo ...) ...) (define (bar ...) ...) (define (yay ...) ...) (some-magical-funcion) --> '(bar foo yay) # is this possible? basically, I want to have some function I can call to get a list of all symbols defined in the current top level

2 1

The future of Gambit
by Bradley Lucier 01 Fév '09

01 Fév '09

I've had a draft e-mail sitting in an IMAP folder for about 8 months with the subject line "The future of Gambit", but with an empty body. Today I still don't know precisely what to put into this body, but at least I found a blog entry that explains a bit of my feelings. I'm not exactly thrilled about the level of "outside" participation in (core) Gambit development. In fact, graphing the Gambit git commit log would be a parody of the argument in http://www.gnome.org/~michael/blog/ooo-commit-stats-2008.html that the lack of non-Sun developers working on OpenOffice.org is an indicator that it is not a healthy project. For there is only one committer to Gambit, and the best that can be said about getting other developers to develop code for Gambit is that a very few times Marc has committed code he hasn't written himself. I've studied the Gambit source code a bit, and even made some contributions over the years, but Marc's programming style is something I have not seen elsewhere---highly macroized and layered, there are patterns in the coding techniques but not ones that I've been able to unravel in general. Perhaps one way to help new developers get into Gambit would be fore Marc to take a subsystem and write down an explanation of how the macros and layers of code for types, exceptions, constructors, functions, ... of that subsystem work. (Christian Jaeger seems to have had some success in doing this, but it would be good to have an explanation of how Marc sees the construction of subsystems of the runtime.) Just to get an idea of Marc's programming style would allow others to divine more easily the structure of the code. And happy holidays to everyone! Brad

6 9

dynamic scope
by lowly coder 01 Fév '09

01 Fév '09

is there anyway i can obtain dynamic scoping in gambit? lexically scoping is really cool, and I want it as the default behavior; i just want the ability to go: (define (foo x) (* x 2)) (define (g x) (foo x)) (pp (list (g 1) (dynamic-let ( (foo (lambda (x) (* x 3)))) (g 1)))) to get me: (2 3)

2 3