Squeak-dev December 2012

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58 participants
216 discussions

Re: [squeak-dev] Xtreams question - OC of chars to String
by mkobetic＠gmail.com 30 Dec '12

30 Dec '12

"Chris Cunnington"<smalltalktelevision(a)gmail.com> wrote: > I don't know. The situation is more like: > > oc := #($a $b $c). > oc := oc asOrderedCollection. > oc reading read: 3 an OrderedCollection($a $b $c) > > > The terminal is the OC. But it returns an OC and I want a string from > the chars. I've been looking at the transforms page of the Xtreams docs > and that seems more about changing the encoding. I think my problem > wasn't really about Xtreams. Hm, I have to admit that collection streams should perhaps support overriding their contentsSpecies. As it is they assume it should be the same as that of their underlying collection. One might argue that terminal streams should stick to their primary purpose of accessing terminals rather than trying to support some types of conversions as well. But there already is a precedent of sorts in the external streams, so it's not entirely solid argument either. Barring that, you could write instead of reading, which would allow you to control the type of the terminal collection. String new writing write: 'abcdefg' asOrderedCollection; close; terminal The reading equivalent would be using the longer version of read where you pass in the target collection but you're then forced to handle the collection size explicitly which seems less elegant: oc := 'abcdefg' asOrderedCollection. string := String new: oc size. oc reading read: oc size into: string. It feels sort of like doing the job of the write stream above by hand. You could also use an identity transform that allows setting the contents species: ('abcdefg' asOrderedCollection reading collecting: [ :c | c ]) contentsSpecies: String; rest But that again feels like more trouble than it's worth. I think that's about all that Xtreams have to offer here. HTH, Martin

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A blog article on Oak
by Göran Krampe 30 Dec '12

30 Dec '12

Hi! I just moved my blog to Octopress (away from Wordpress) and must say this is much more up my alley. And doing so I also published a rather long article on Oak - Nicolas little OODB-thing that I am using: http://goran.krampe.se/2012/12/29/oak/ If you have questions about Oak, feel free to either reply here or comment on the article. If you have questions on Octopress and migrating from Wordpress - feel free to ask about that too! ...and a happy new year! regards, Göran PS. Colorized Smalltalk code in Octopress markdown is trivial, I just do this: ``` smalltalk 3 + 4 ```

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SVN repository problems?
by tim Rowledge 30 Dec '12

30 Dec '12

I've been trying to do a checkout to start getting things on the RaspberryPi archived and all I get is the infamous (and described in about six million different ways in error reports all across the web) '200 OK' error. My current copies of the RISC OS sources are so old they still have the HP server urls in there! The svn app I'm using is quite happy with a couple of other repositories, so I guess there might be some problem related to rebooting the servers earlier today? A 200 error (even though it declares itself with 'OK", nice error reporting there, whoever wrote that part!) appears to have something to do with the Apache setup of the relevant site but honestly, if you google 'svn options of 200 ok checkout' you'll find the problem mentioned a gazillion times and eleventy times as many supposed explanations. Not too helpful. Can anyone else do a `svn co http://squeakvm.org//svn/squeak/trunk platforms` ? tim -- tim Rowledge; tim(a)rowledge.org; http://www.rowledge.org/tim Is reading in the bathroom considered Multi-Tasking?

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Re: [squeak-dev] 4.4 ready?
by David Corking 29 Dec '12

29 Dec '12

How about deleting the broken 'set language' menu entry from TheWorldMenu>>helpMenu that David Lewis patched on Thursday? (*) It seems misleading to ship with a menu item that does nothing. Will Squeak 4.4 ship with any localizations, or only in English? If not, then probably it is ok to delete the menu entry and wait for 4.5 to fix the localization regression. Have fun and thanks for a great imminent release! David * {'set language...' . {Project. #chooseNaturalLanguage}. as mentioned in http://lists.squeakfoundation.org/pipermail/squeak-dev/2012-December/167265… p.s. I can't find the draft release notes on the mailing list or the swiki. (I guess they aren't in the update stream. If they are, I am afraid I don't know what method shows them.) Could someone post a link for me please? p.p.s. I am starting to hate 'new compose' in Gmail. squeak-dev moderator please delete the earlier version of this message I sent from an unsubscribed address.

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Sound effects dropping tiles
by Open Slate 29 Dec '12

29 Dec '12

I was checking out the MIT App Inventor for Android (originally from Google Labs), to help get my son started with Android programing. http://appinventor.mit.edu/explore/content/what-app-inventor.html One cool feature is the positive feedback when a tile is correctly dropped into place. The tile moves and appears to snap into place, and a satisfying click plays through the computer's sound system. A feature to consider for morphic. -- Gary Dunn Open Slate Project http://openslate.org/

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[Test][Squeak4.4-12324][Failure] Compiler recompileAll
by H. Hirzel 29 Dec '12

29 Dec '12

Hello TEST: Evaluate Compiler recompileAll in a Workspace in version Squeak4.4-12324. RESULT: Brings up a syntax error Method #roll: in class Random does not compile. Neither does it compile this version http://ftp.squeak.org/4.4alpha/Squeak4.4-11925.zip (March 2012). NOTE: I found out about this because I was running Smalltalk unloadAllKnownPackages in version Squeak4.4-11925 --Hannes

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[Test][Squeak4.4-12324] Pipes Game
by H. Hirzel 29 Dec '12

29 Dec '12

The Pipes Game from http://squeak.preeminent.org/ for Squeak version 4.1 loads and runs fine for Squeak 4.4-12324 as well. http://squeak.preeminent.org/source/4.1/SqueakPipe-sbw.22.mcz SqueakMap has an entry for Squeak version 3.9 and that points to http://www.squeaksource.com/SqueakPipes/SqueakPipe-sbw.23.mcz --Hannes

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[ANN] Zippers for Squeak 4.4
by Frank Shearar 29 Dec '12

29 Dec '12

A zipper is a data structure that lets you efficiently "modify" an immutable data structure. "Modify", because a zipper creates a new, updated, data structure that reuses as much of the original structure. Local modifications and navigations are constant time. This zipper implementation lets you walk over an arbitrary graph structure by leaving the decision of what "up", "down", "left" and "right" means to you, the programmer. (Zippers should also work just fine in Squeak 4.3, Pharo 1.4 and Pharo 2.0.) frank

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[ANN] Magma 1.4
by Chris Muller 29 Dec '12

29 Dec '12

I am pleased to announce the release of Magma 1.4 for Squeak 4.4. Magma is a database for Squeak that allows complex domain models to be developed with virtually no regard for persistence issues. Said models can run entirely in memory without Magma even loaded in the image or, by loading Magma, the size of the domain model can exceed the size of RAM and be simultaneously accessed and updated by multiple clients over a network with ACID properties. Further, by copying the database files to another machine on same network and starting a server on them, uninterrupted 24x7 service is gained automatically -- either server can go down at any time and will be automatically sync'd from the other when restarted. Magma regards data-integrity as a top priority. My oldest critical database still running today was "born" in 2004 and has survived major domain refactorings, 8 years of Magma upgrades, two hard-drive crashes and several power-outages. By hashing the contents of every commit, and writing them atomically to disk (among other security measures), Magma is an ultra-safe place to develop and store mission-critical objects. Correct mcz versions of domain code can be co-located in the same repository as the model it runs, ensuring full application recoverability even in the worst circumstances. I've learned that transparent persistence is a complex problem that, IMO, only a mature framework can deliver in a mature way. Magma 1.4 brings heightened levels of stability, robustness and performance over its predecessor. Applications just run better, faster, with better memory management, usability and performance. The change-log has all of the gory details. This, combined with the recent release of Cog 2640, IMO, makes Squeak+Magma a fantastic platform. PS - Even if you don't use Magma for persistence in your own applications, simply starting an empty database and copying all of your mcz's to it allows the Squeak IDE to show all "mc versions" and the "mc origin" of any method as options on the methods menu, very nice for general development.

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More details
by Open Slate 28 Dec '12

28 Dec '12

The 4.4 welcome screen lists some interesting features, among them "Merged network improvements from Etoys." Where can I get more details on these new features? I was struggling to figure out how a bookmorph stores pages on a server, never could unravel the mystery. And Etoys has a great presence feature based on, if I recall, XMPP that I would love to see working in Squeak. -- Gary Dunn Open Slate Project http://openslate.org/

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