- Pharo-dev - lists.pharo.org

Re: [Pharo-project] [squeak-dev] Smalltalk for small projects only?
by Dale Henrichs Jan. 29, 2012

Jan. 29, 2012

Karl, For the types of project that would employ a team of 200, you need to be able to reliably reproduce the state of an image, from scratch, 5 years after development has completed ... I invite you to read Allen Wirfs-Brock's paper on "Declarative Smalltalk"[1]. Here are some excerpts: Smalltalk does not include the concept of a program as a distinct entity. In practice, a Smalltalk program is the state of a virtual image when work is declared completed. Lack of a program definition in traditional Smalltalk environments leads to an undue reliance on the virtual image. Images can become obsolete or broken. Because the program is encoded in the image, the program is in danger of becoming inaccessible if the image becomes outmoded or corrupt. The manual and unreliable nature of the initialization of Smalltalk programs leads to a number of program errors. Especially prevalent after reconstruction of a program in a new image are errors where program elements have an initial value of nil instead of some other value as originally intended by the programmer. The use of a declarative specification model has little direct impact upon Smalltalk programmers. Even though Smalltalk has traditionally been implemented using an imperative program description model, the perception of most Smalltalk programmers is of a declarative model. This is because Smalltalk programmers typically create and edit programs using a browser that presents the classes that make up the program in a declarative style. Disclaimer: I worked with Allen Wirfs-Brock in the nineties (engineer on the Team/V team) while he was developing his ideas for Declarative Smalltalk, so I am somewhat biased in my thinking:) My opinion that being able to build images from scratch (easily and reproducibly) is a "requirement" to get in the door for mainstream projects... giving mainstream developers the opportunity to work in a image-based environment will set them free:) Dale [1] http://www.smalltalksystems.com/publications/_awss97/SSDCL1.HTM ----- Original Message ----- | From: "karl ramberg" <karlramberg(a)gmail.com> | To: "The general-purpose Squeak developers list" <squeak-dev(a)lists.squeakfoundation.org> | Cc: "VWNC" <vwnc(a)cs.uiuc.edu>, Pharo-project(a)lists.gforge.inria.fr | Sent: Saturday, January 28, 2012 11:39:22 AM | Subject: Re: [squeak-dev] Smalltalk for small projects only? | | On Sat, Jan 28, 2012 at 7:07 PM, Dale Henrichs < dhenrich(a)vmware.com | > wrote: | | You are talking about dealing with source code, but what about the | live objects in the image? Is there any work done on managing live | images with several developers ? This is where Smalltalk excels and | would be very interesting instead of falling back to the rebuild | from source strategy. | | Karl

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Re: [Pharo-project] FSFileSystem: modification date
by Marcus Denker Jan. 29, 2012

Jan. 29, 2012

On Jan 27, 2012, at 9:42 PM, Camillo Bruni wrote: > Hi Deby, > > Open a bug report :) I think the memory FS should handle the modification / creation dates exactly as it would on disk... > There is a bug entry here already: http://code.google.com/p/pharo/issues/detail?id=3154 -- Marcus Denker -- http://marcusdenker.de

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[Pharo-project] Problems loading underscore assignments
by Sean P. DeNigris Jan. 29, 2012

Jan. 29, 2012

I tried both programmatically ("Scanner allowUnderscoreAsAssignment: true") and via the settings browser to allow underscore assignments, but I still got errors loading AtomMorph. e.g. "Syntax Error" randomPositionIn: aRectangle maxVelocity: maxVelocity "Give this atom a random position and velocity." | origin extent | origin _ aRectangle origin. extent _ ***Nothing more expected ->***(aRectangle extent - self bounds extent) rounded. self position: (origin x + extent x atRandom) @ (origin y + extent y atRandom). velocity _ (maxVelocity - (2 * maxVelocity) atRandom) @ (maxVelocity - (2 * maxVelocity) atRandom). -- View this message in context: http://forum.world.st/Problems-loading-underscore-assignments-tp4337617p433… Sent from the Pharo Smalltalk mailing list archive at Nabble.com.

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Re: [Pharo-project] loading Seaside 3.0.6.3 in Pharo 1.4
by Marcus Denker Jan. 29, 2012

Jan. 29, 2012

On Jan 29, 2012, at 5:32 PM, Guido Stepken wrote: > Marcus Denker Why me? What did I do? Moose? You are surely mistake me for someone else. Marcus -- Marcus Denker -- http://marcusdenker.de

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Re: [Pharo-project] Trying to build CogVM in MacOSX 10.7 Lion
by dimitris chloupis Jan. 29, 2012

Jan. 29, 2012

it appears I was correct according to this http://ask.metafilter.com/200231/How-to-install-gcc-42-on-a-macbook-with-Xc… and a gazillion other results from google . It no longer ships with Xcode-4.2. I assume you have upgraded from 4.1 that is why you have it. Ok I am ready to try macports but how ? I have several gccs in macports gcc-apple-4.2 andÂ i686-apple-darwin11-gcc-apple-4.2.1 which one and how ? ________________________________ From: Esteban Lorenzano <estebanlm(a)gmail.com> To: dimitris chloupis <thekilon(a)yahoo.co.uk> Sent: Sunday, 29 January 2012, 22:32 Subject: Re: [Pharo-project] Trying to build CogVM in MacOSX 10.7 Lion I really don't know... maybe Sean (who installed xcode from scratch recently) can confirm that.Â so... let's try with macports... :) best, Esteban El 29/01/2012, a las 5:30p.m., dimitris chloupis escribiÃ³: in usr/bin I have i686-apple-darwin11-llvm-g++-4.2 andÂ 686-apple-darwin11-llvm-gcc-4.2. Both are symlinks that point to the usr/llmv-gcc-4.2/bin and corresponding binaries. > > >Dont know why, there is also a gcc binary in my home folder. Maybe IÂ accidentallyÂ moved it there before the install.Â > > >The install was sucessful as far I can tell, there were no errors. > > >as I said the only thing non llvm is in macports folder which of course is not related to xcode install. I feel that I can bet serious money that the new xcode comes with only llvm compilers. Maybe I am wrong. Â > > > >________________________________ > From: Esteban Lorenzano <estebanlm(a)gmail.com> >To: Pharo-project(a)lists.gforge.inria.fr; dimitris chloupis <thekilon(a)yahoo.co.uk> >Sent: Sunday, 29 January 2012, 22:09 >Subject: Re: [Pharo-project] Trying to build CogVM in MacOSX 10.7 Lion > > >he... connection problems... yeah, I know a lot about them :) > > >well... after a successful install, I *think* you should have gcc and gcc-4.2... last one is also a symlink who points to:Â > > >/usr/bin/i686-apple-darwin11-gcc-4.2.1 > > >who should be there... is that the case? > > > > > > >El 29/01/2012, a las 4:51p.m., dimitris chloupis escribiÃ³: > >there is no gcc in usr/bin at all. Afterall your first command removed the only one ;) >> >> >>I have reinstalled Xcode Â to be sure . My Xcode About box says its XCODE 4.2 build 4D199 >> >> >>no idea how to update cause I downloaded it via torrent, could not download from app store cause my connection is crapish and each time IÂ disconnectedÂ it canceled my upload (no I could not resume, tried everything). So I had to install via torrent.Â >> >> >> >> >> >> >> >>________________________________ >> From: Esteban Lorenzano <estebanlm(a)gmail.com> >>To: Pharo-project(a)lists.gforge.inria.fr; dimitris chloupis <thekilon(a)yahoo.co.uk> >>Sent: Sunday, 29 January 2012, 20:49 >>Subject: Re: [Pharo-project] Trying to build CogVM in MacOSX 10.7 Lion >> >> >>There is a problem there... if you have XCode 4.2.1 (latest), you should have that one... xcode just changed the default, it did not remove the gcc, AFAIK. >> >> >>which versions of gcc do you have in /usr/bin? >> >> >>oh, btw... is ln -s, not just ln (my mistake, but both should work) >> >> >>(symlink macport gcc should work, but I'm fearing there is something wrong with xcode instalation, and that's probably the reason it didn't compiled the first time, so, let's be sure about that before try the port) >> >>El 29/01/2012, a las 3:40p.m., dimitris chloupis escribiÃ³: >> >> >>> >>>>> sudo rm /usr/bin/gcc >>> >>> >>>success ! >>> >>> >>>>> sudo ln /usr/bin/gcc-4.2 gcc >>> >>>fail ! >>> >>> >>>no such file >>> >>> >>>there is a gcc symlink in developer/usr/bin that point to developer/usr/llvm-gcc-4.2/llvm-gcc-4.2 >>> >>> >>>there is no gcc-4.2 in my Xcode folder or other folders except the gcc folder that I installed via macports following the previous tutorial that I have linked. Should I symlink macports gcc-4.2 ? >>> >>> >>>Xcode is by default isntalled in the Developer folder >>> >>> >>>I am open to suggestions and thanks for helping me. Â >>> >>> >>>Â Â >>> >>> >>> >> >> >> > > >

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[Pharo-project] Adding a message for handling disposable resources?
by Guillermo Polito Jan. 29, 2012

Jan. 29, 2012

Hi! It's very common to have the same structure when handling resources that should be disposed after using -normally when they belong outside the image- like files, aliens, database transactions, mutex semaphores... *[ open the file do something with the file ] ensure: [ close the file ] **[ create an alien do something with the alien ] ensure: [ free the alien ] * * [ open the transaction do something with the transaction transaction commit ] ensure: [ transaction if open, transacction rollback. ] * Some times, this structure is abstracted in a high order method(?) using blocks.. *session inTransactionDo: [ "do something with the transaction" ] Semaphore forMutualExclusion critical: [ "do something with the semaphore ]* Ok, Python and C# add the *with* and *using* statement, handling the resource disposing in a polymorphic way block of code is executed, like: with aFile: #use the file or using (aDatabaseTransaction){ /* use the database transaction */ } Even in Java 7 they've included a construction for auto-dispose of resources: *try (BufferedReader br = new BufferedReader(new FileReader(path)))* { return br.readLine(); } What about adding a polimorphic (for example) #releaseAfter: method like *Object>>releaseAfter: aBlock self retain. [ aBlock cull: self ] ensure: [ self dispose ] Object>>dispose "hook for disposable resources" ** Object>>retain "hook for resources which can be retained"* * Alien>>dispose self free **File>>retain self open* * File>>dispose self close Stream>>dispose self close Transaction>>dispose self isOpen ifTrue: [ self rollback ] * And so? this way resources can be handled in an uniform way. Cheers, Guille

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[Pharo-project] PseudoContext?
by StÃ©phane Ducasse Jan. 29, 2012

Jan. 29, 2012

Hi I have the impression that PseudoContext is not used anymore. At least compact class array and special object array do not use it anymore. So what is the use for this class? Stef

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Jan. 29, 2012

Hi ben and others I fixed the RPackage implementation to the renaming of announcements. Now all the tests are green again. Stef

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[Pharo-project] [ANN] ConfigurationOfMongoTalk
by Esteban Lorenzano Jan. 29, 2012

Jan. 29, 2012

Hi, I created a configuration of mongo talk who is able to load mongo in a Pharo 1. 3 or Pharo 1.4 image. Gofer it squeaksource: 'MetacelloRepository'; package: 'ConfigurationOfMongoTalk'; load. (ConfigurationOfMongoTalk project version: #stable) load. this will install all you need (not much really), and if you have mongodb running in localhost you will be ready to execute tests. Cheers, Esteban

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Re: [Pharo-project] FOSDEM2012 smalltalk devroom 5 feb, sprint 4 feb
by Marcus Denker Jan. 29, 2012

Jan. 29, 2012

> 09:30 Norbert Hartl, Take a small REST. Simple approaches for REST in smalltalk > 10:00 Stephane Ducasse, Marcus Denker, The next steps for the Pharo Vision > I checked for trains... the *first* train from Lille arrives 9:45 in Bruessels Midi Sundays. I don't feel like booking a Hotel in Bruessels, I have to admit. -- Marcus DenkerÂ --Â denker(a)acm.org http://www.marcusdenker.de

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