cells-devel May 2007

cells-devel@common-lisp.net

11 participants
14 discussions

[cells-devel] Installation handholding required (only a little :-))
by Andy Chambers 07 Jun '07

07 Jun '07

Hi, Could someone give us a few pointers on how to get celtk running on linux/sbcl please. I've downloaded the latest source from cvs for cells, and celtk. The demo for ltk runs fine but I suspect that might be irrelevant. When I (require :celtk) after linking the relevant asd files to my ~/.sbcl/systems, I get some errors, the first of which is that "utils-kt:eval-now! is not defined". If I just keep on accepting the errors/warnings it does eventually compile. Howver, when I try (ctk::tk-test), I get "Unable to load foreign library: libtcl.so". This file doesn't seem to belong to any debian package. Cheers, Andy p.s This program has the best name ever!! (I support Glasgow "Celtk" football team)

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[cells-devel] "How would you like to have your ad on 2 Million Websites ?"
by Blog＠common-lisp.net 23 May '07

23 May '07

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[cells-devel] "How would you like to have your ad on 2 Million Websites ?"
by Blog＠common-lisp.net 23 May '07

23 May '07

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[cells-devel] Get 1000's of Highly Targeted visitors
by Quality＠common-lisp.net 21 May '07

21 May '07

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[cells-devel] Cells + CL-WHO: Strange behavior - your help needed ...
by Frank Goenninger 13 May '07

13 May '07

Hi all: I do have a strange behaviour of a small code snippet ...: (the used macro with-html-output is from CL-WHO - see http:// www.weitz.de/cl-who - it generates HTML markup) (defmacro as-html (&body body) `(with-html-output (*standard-output*) ,@body)) (defmodel simple (family) ((slot-1 :accessor slot-1 :initform (c-in nil) :initarg :slot-1)) (:default-initargs :value (c? (as-html (:h1 (^slot-1)))))) Now when inspecting the result of (make-instance 'simple :slot-1 "Hi") I get no value back for slot-1 but simply see <h1></h1> ... - what the f*ck am I doing wrong ??? Inspecting the instance reveals: SIMPLE15 is a standard-object. [type: SIMPLE] -------------------- Class: #<STANDARD-CLASS SIMPLE> .MD-STATE: :AWAKE .AWAKEN-ON-INIT-P: NIL .CELLS: ((.KIDS . =0/.KIDS/SIMPLE15])) .CELLS-FLUSHED: ((.VALUE . <vld>=1/.VALUE/SIMPLE15])) ADOPT-CT: 0 .MD-NAME: SIMPLE15 .FM-PARENT: NIL .VALUE: "</h1>" ZDBG: NIL .KID-SLOTS: NIL .KIDS: NIL SLOT-1: "Hallo" Hunh? Slot ".value" is "</h1>" ?? Any help really appreciated ... Oh - ah - this is going to be part of marrying Cells with Edi Weitz's Hunchentoot Web Server (see http://www.weitz.de/hunchentoot ) Thx!!! Cheers - Frank

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[cells-devel] Using with-integrity
by Josip Gracin 11 May '07

11 May '07

Where can I learn about various opcodes for with-integrity? I'm using (with-integrity (:change) ...) with merely a hint on what it actually does. Thanks!

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Re: [cells-devel] How to delay evaluation of defobserver?
by Josip Gracin 10 May '07

10 May '07

Ken Tilton wrote: > Depending on the design, you might also consider having a Cell that says > "OK, now the model has reached this state", part of which is determined > by these other instances coming into existence. That is what I actually need. I'm constructing a model with lots of interdependent instances and I'd like to be able to say, "Ok, I've created all instances of the model, make it alive." Isn't this what to-be used to do? Here's an example. I have defined a macro called make-system which lets me create family trees in convenient way. It just creates instances and sets appropriate fm-parent for each instance. Its lambda list is (class-name system-name &rest args) For example, it converts (make-system b777-aircraft :aircraft) into (make-instance 'b777-aircraft :md-name :aircraft). The &rest 'args' can contain keyword :subsystems which recursively calls make-system on the rest of the args after that keyword (supplying :fm-parent in all subsystems). This all is a substitute for what I've used to accomplish with "(make-instance parent-class :kids (list ...)" in cells2.0. ;;============================================= (make-system b777-aircraft :aircraft :subsystems (lights :lights :subsystems (switch :pass-signs-switch) (switch :no-smoking-signs-switch) (b777-flaps-system :flaps-system :subsystems (b777-flaps-lever :flaps-lever) (flaps-indicator :flaps-indicator) .....) ;;============================================ So, I instantiate all components of an aircraft in this one place. Now, suppose I have an observer defined on some slot of class 'switch' (see above) and that the body of the observer depends on :flaps-indicator component. At the moment when switch :pass-signs-switch is instantiated, flaps-indicator still does not exist, so when the observer is called, it fails. As I said in my previous mail, it seems to be the case of "don't do it then". :-) The "fix" is to define the observer after the aircraft has been constructed, so that all its components are available. OTOH, if I were able to stop the Cells engine, create instances, and then start the engine, that's what I'd do instead. Thanks!

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Fwd: [cells-devel] How to delay evaluation of defobserver?
by Ken Tilton 09 May '07

09 May '07

[Sorry if folks have seen this before, but I haven't, so not sure what is going on. - kt] ---------- Forwarded message ---------- From: Ken Tilton <kentilton(a)gmail.com> Date: May 9, 2007 5:12 PM Subject: Re: [cells-devel] How to delay evaluation of defobserver? To: Josip Gracin <gracin(a)tel.fer.hr> Not sure what is going on. I sent this to the list and you earlier from another mail account and apparently neither got thru. Trying again direct from google mail. Saw your second note. Nah, I would do anything with load order. But this is a design question, which means it cannot be answered in the abstract (which is what I cover below). kt Josip Gracin wrote: Hello! I've successfully ported my application from cells2.0 to Cells3. Cells3 looks very nice indeed. When needed, I've used c_? to delay evaluation and it worked great. However, I also have some observers defined with defobserver and I'd like them to be lazily evaluated because they depend on some not-yet-created instances. Is there a way to do this? You might have to provide an example, distilled from your application if the whole thing would be too much. Are you saying obersvers are getting called even before the lazy cell got kicked off? Or do you mean, OK, the lazy cell gets kicked off when expected, but now I further want to defer the observer running? Or is this unrelated to lazy cells? ie, You have a normal cell but you want the observer deferred? But then, OK, how do you indicate when the laziness ends and the observer should fire? Presumably you want a rule X that terminates laziness and activates an observer. If so, you could just code up: (defobserver ..... (when X ;; in your case, (fm-includes self <whavtever>) <stuff that depends on whatever>)) Depending on the design, you might also consider having a Cell that says "OK, now the model has reached this state", part of which is determined by these other instances coming into existence. Then you either hang your observer off that new state variable or check that state variable in the observer. kt -- Ken Tilton Theory Y Learning ken(a)theoryyalgebra.com 2112 Baileys Corner Rd http://www.theoryyalgebra.com Wall, NJ 07719 732-359-6038 | 646-269-1077 (m)

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[cells-devel] test (ignore)
by Ken Tilton 09 May '07

09 May '07

test

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[cells-devel] How to delay evaluation of defobserver?
by Josip Gracin 09 May '07

09 May '07

Hello! I've successfully ported my application from cells2.0 to Cells3. Cells3 looks very nice indeed. When needed, I've used c_? to delay evaluation and it worked great. However, I also have some observers defined with defobserver and I'd like them to be lazily evaluated because they depend on some not-yet-created instances. Is there a way to do this?

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cells-devel May 2007