Squeak-dev April 2007

squeak-dev@lists.squeakfoundation.org

151 participants
201 discussions

os-x dashboard widgets and Squeak.
by John M McIntosh 26 May '07

26 May '07

Since Dashboard widgets are just HTML, it is of course possible to have a os-x dashboard widget display a particular EToy project. However I need an EToy project that is small in size, does something cute/interesting/useful and something a user would want on his os-x dashboard desktop. If anyone can suggest something, please let me know. -- ======================================================================== === John M. McIntosh <johnmci(a)smalltalkconsulting.com> Corporate Smalltalk Consulting Ltd. http://www.smalltalkconsulting.com ======================================================================== ===

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Re: Celeste in 3.10
by Rob Withers 13 May '07

13 May '07

----- Original Message ---- From: Lex Spoon lex(a)lexspoon.org > Why did you pick SMIME rather than PGP, by the way? PGP seems to be > better established, in part because it is not just for email. I chose SMIME for several reasons: 1) OpenPGP support has already been started by Hans Martin Mosner and I didn't want to step on his work, since I didn't understand it. 2) I wanted to leverage the work we had done on ASN.1 and S/MIME uses CMS which is defined using ASN.1 3) Both Mac Email and MS Outlook provide S/MIME support by default. All you need do is add a Certificate, and you are encrypting and signing. I felt S/MIME had more installed base. 4) Most CAs issue Certificates in X509 format, used by SMIME 4) I was bored and I needed a project. Would it be possible to support both S/MIME and PGP? I have defined a CertificateStore, which I persist on disk, in which I save the users private key, the user's certificates, and the recipients' Certificates for encrypting. Presumable PGP needs the same kind of info. I had read that the Certificate structure is different for PGP, so maybe that would be sufficient for differentiating between the two. If we added SMIME to Celeste, it would become dependent on most of the Cryptography repository (http://www.squeaksource.com/Cryptography) - would that be ok? There would need to be some UI changes - when editing to mark an email for signing and/or encryption, and when receiving an email to display whether signed, encrypted, or both. It may make sense to have a header form and a body form, and the body form would be multipart aware. I dunno. Rob

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[ANN] Banyan backup and file utility
by Chris Muller 11 May '07

11 May '07

Hi everybody, I made a neato backup program in Squeak. I work on multiple computers and couldn't find a backup program that exactly suited my needs, so I rolled my own. It's called "Banyan" because of the fact it builds in internal model of merged directory trees to calculate (and display) what it is *about* to do before it does it. Here is a short synopsis: * easily transfer / backup work from one personal computer to another. * understand space utilization. * compare any number of directories (2 or more) simultaneously. * file-management convenience. It's on SqueakMap. For more information, see: http://wiki.squeak.org/squeak/5980 Enjoy. - Chris

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[ANN] Documentation for Omnibrowser
by Bergel, Alexandre 07 May '07

07 May '07

Dear Squeakers, Our paper on Omnibrowser has been published finally. http://www.iam.unibe.ch/~scg/Archive/Papers/Berg07cOmnibrowser.pdf Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.software-artist.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

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[ANN] FreeType Plus release
by Andrew Tween 07 May '07

07 May '07

This is an official announcement that the FreeType Plus packages are now released. You can download from SqueakMap, or via the Package Universe within a developer Squeak (squeak-dev) image. I will be documenting various aspects of this on the wiki; at present you can view some screenshots, and read some preliminary descriptions, at http://wiki.squeak.org/squeak/5984 It will work, to varying degrees, on Windows (98, 2000, XP, & Vista); Linux (OpenSUSE, Fedora, Ubuntu, etc.); and Mac OS X. It requires an FT2Plugin, which is shipped with the Mac VM, and is available for Windows/Linux via the FreeType Plus (plugins installer) package. To enable sub-pixel anti-aliasing, the optional, and separate, FreeType Plus (sub-pixel anti-aliasing) package must be installed. This requires a modified BitBltPlugin. This is currently available for Windows/Linux only, and is installed via the FreeType Plus (plugins installer) package. If anybody wishes to attempt compile it for Macs, then please let me know. Rather than try to describe everything, and anticipate every question in advance, I would rather wait to see how people get on with installing/using it, and then update and improve the documentation accordingly. So, if you have problems, then please let me know; and if you have success then that would be nice to hear about too :) Cheers, Andy

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The OLPC laptop in a Nigerian classroom
by Giovanni Corriga 07 May '07

07 May '07

Hi all, while surfing the web I stumbled upon this picture that I'd like to share with you: http://news.com.com/2300-1041_3-6175025-4.html?tag=ne.gall.pg Kudos to all the OLPC hackers, thinkers and revolutionaries. Giovanni

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Apple Video System
by Tim Johnson 05 May '07

05 May '07

Hello all, Was there ever code in the Mac OS 8/9 days to handle the Apple Video System video input hardware often included on Beige PowerMacs such as the 6500/8600/Beige G3? I'm just looking to grab a frame as a Form. Or would this be a job for the OSAPlugin? Thanks a lot, Tim

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[BUG] Mysterious Delay lockups
by Andreas Raab 05 May '07

05 May '07

Hi Folks - Some of you (mostly those who run heavy servers) may have noticed that at times Squeak locks up in mysterious and unforeseen ways. One of those lockups involves Delay's AccessProtect in an unsignaled state and consequently the entire image locking up since Delay access is required in many, many places. Today, David presented me an image that was locked up in such a state but by sheer luck he managed to save it right before it happened which allowed me to investigate the situation. The result can best be explained by the little test case shown here: "Create mutex unsignaled so we can manually signal it" mutex := Semaphore new. "Create a process which will wait inside the mutex" p := [mutex critical:[]] forkAt: Processor userBackgroundPriority. "Wait until process has entered mutex" [p suspendingList == mutex] whileFalse:[(Delay forMilliseconds: 10) wait]. "Signal mutex" mutex signal. "Kill process" p terminate. "and check to see if the mutex is signaled" mutex isSignaled ifFalse:[self error: 'Mutex not signaled']. Note that despite the somewhat complex setup the basic idea is that a low priority process waiting in a critical section receives a signal on the semaphore it is waiting on but gets terminated by a higher priority process inbetween receiving the signal and execution of the process itself. This situation (manually executed in the above to make it more easily repeatable) can happen in many situations where processes get terminated "from the outside" and it would cause particular grief in the timing semaphore because it gets served by the highest priority process which makes the unfortunate cause of events much more likely. All Squeak versions that I have access to expose this behavior. Looking at Semaphore>>critical: which says Semaphore>>critical: aBlock self wait. [blockValue := aBlock value] ensure: [self signal]. makes it seem as if moving the wait into the ensured block is the correct answer, but that ain't necessarily so. When we move the wait into the block we risk that the entering process is terminated after entering the block but before entering the wait which would leave the semaphore signaled twice, which is just as bad as not signaled at all. Methinks a solution would involve Process>>terminate but I'm running out of steam after trying to understand the problem in all its implications. Any ideas would be greatly welcome. Cheers, - Andreas

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Plan for 3.10 iteration 2
by Edgar J. De Cleene 05 May '07

05 May '07

I complete the unload of Etoys and Nebraska from Squeak3.10alpha.7091.image. I wish take this chance of major change for incorporate in this Squeak3.10alpha.7091W.image. (W for without Etoys and Nebraska) , some things required for members (Mulltillingual and others) what at this point I could't do using the "Monticello way" what we are using now. Things what you wish know. Some class of "old Etoys" are keep into image, my experiments with SqueakLight shows what soon or later you need one. Etoys and Nebraska was reshaped taking this and MinimalMorphic lessons. One of 3.10 targets is for easier the transition to smaller images what all could use in safe form. Etoys and Nebraska Nebraska unload an load again. Without changes his classes intialize and with our current Ralph version of Monticello !! (This wonder me too ) The only what I need in the first ever try was: To first complain is fileIn Vocabulary >> changeMadeToViewerAdditions and at the second for TileMorph initialize "TileMorph readInArrowGraphics -- call manually if necessary to bring graphics forward" this steps requires three .morphs in user directory. Off course , all need use and test and sure many changes for all works as if never Etoys and Nebraska go out or image. SystemNavigation default allUnimplementedCalls size 183 grows to 352. Cleaning take some more time. Image without Etoys and Nebraska is .8 Mb smaller (first unpolished try). So I required your feedback. I should put this Squeak3.10alpha.7091W.image into Squeak ftp for all could try and give opinions ? Or ask to Klaus for he put in his ftp ? Edgar PS> If wait what I do all the methods rewrite , send note to my Apple dealer for they lower his prices. :=)

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multilingual A-macron howto ?
by nicolas cellier 04 May '07

04 May '07

Hello list, I wonder how a A-macron (Character value: 256) or a-macron (Character value: 257) would display in Squeak. I have no extended latin font loaded in the image, but it seems to me that those characters would be interpreted as EndOfRun or CrossedX when i read the code in (Multi)CharacterScanner>>scanMultiCharactersFrom:to:in:rightX:stopConditions:kern: (encoding = 0 and: [ascii < stopConditions size and: [(stopConditions at: ascii + 1) ~~ nil]]) ifTrue: [^ stops at: ascii + 1]. Am i wrong or is this a known problem? Nicolas

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