April 2021 - Pharo-users - lists.pharo.org

[ANN] Freezing Pharo 9 development right now :)
by Esteban Lorenzano May 3, 2021

May 3, 2021

Hi, So, today I was checking how much it is missing for release and what is our status, and I realized if we do not freeze now, we will never release in a reasonable time. So, even if there are a couple of cleanups and that to still do that should happen before, I will declare that Pharo 9.0 enters in freeze Pharo 9.0 right now (and I will sneak the cleanups anyway, but being more careful). What does this means? No more features, just bugfixes No more fixes of things that can wait until Pharo 10 In two weeks I will open the Pharo 10 development branch, up to then, please help fixing what's missing (which is a lot) ! Have a great weekend, cheers! Esteban

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SQLite3 primitiveFailed after FFI call
by Esteban Maringolo April 30, 2021

April 30, 2021

Hi all, I'm having a strange issue when executing a query with the SQLite3 driver (via GLORP). In: SQLite3Library>>#apiPrepare: dbHandle withSQLText: anSQLText with: textSize with: sHandle with: tail "int sqlite3_prepare_v2(sqlite3*, const char*, int, sqlite3_stmt**, const char **)" ^ self ffiCall: #(int sqlite3_prepare_v2 (sqlite3* dbHandle, String anSQLText, int textSize, sqlite3_stmt** sHandle, const char** tail)) After the FFI call, I get a primitive failed error when some part of the FFI machinery sends instVarAt: index to the undefined object. This is the call stack: PrimitiveFailed(Exception)>>signal PrimitiveFailed class(SelectorException class)>>signalFor: UndefinedObject(ProtoObject)>>primitiveFailed: UndefinedObject(ProtoObject)>>primitiveFailed UndefinedObject(Object)>>instVarAt: SQLite3Library>>apiPrepare:withSQLText:with:with:with: SQLite3Library>>prepare:on:with: SQLite3PreparedStatement>>prepare: SQLite3Connection(SQLite3BaseConnection)>>prepare: SQLite3Connection>>execute:with: SQLite3Driver>>basicExecuteSQLString:binding: SQLite3Driver>>basicExecuteSQLString: PharoDatabaseAccessor>>basicExecuteSQLString: PharoDatabaseAccessor>>executeCommandUnbound: QuerySelectCommand(DatabaseCommand)>>executeUnboundIn: If I run the same query via an external SQL tool (sqlite3) it works, returning a single row with a single value as expected. What's weird is that this doesn't fail always, since it's a very common query in the app. Any ideas? Esteban A. Maringolo

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creating a subclass in system browser
by Sanjay Minni April 29, 2021

April 29, 2021

Hi is there a way I can create a subclass when I have selected a class in the System Browser class list (top 2nd panel). Couldnt see any option - Or is it that no such feature is needed ----- cheers, Sanjay -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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Mooc on Advanced OO design looking for interested teachers.
by StÃ©phane Ducasse April 28, 2021

April 28, 2021

Hello Iâm starting to write a Mooc on Advanced OO design. It will be in the same format that the Pharo Mooc. I would like to know if some of you can be interested using part of this mooc in their curriculum. It will help me for a funding agency Iâm applying to. S. -------------------------------------------- StÃ©phane Ducasse http://stephane.ducasse.free.fr / http://www.pharo.org 03 59 35 87 52 Assistant: Aurore Dalle FAX 03 59 57 78 50 TEL 03 59 35 86 16 S. Ducasse - Inria 40, avenue Halley, Parc Scientifique de la Haute Borne, BÃ¢t.A, Park Plaza Villeneuve d'Ascq 59650 France

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Announcements - and whether its bad to check if a subscription would be handled?
by Tim Mackinnon April 27, 2021

April 27, 2021

Hi everyone - Iâve always thought the article on announcements many years ago was very cool - and we donât seem to use them as much as we could (but equally they arenât a panacea to be overused everywhere either - and they do get used in Pharo to some extent). Anyway, Iâve been playing around with CodeParadise (CP is a very cool project, and Erik is very supportive and thinking about how to write web apps a different wayâ¦ Iâm fascinated), And - CP uses announcements as mechanism to send events from the View Client (in a web browser) to a Presenter on the server (which makes total sense). In taking things for a spin, I hit an interesting problem on how in a web component world, you should display a spelling test of words - e.g. SpellingTest â has many â> SpellingWord(s). Initially I bunged it all in a single presenter with its associated view, and it was a bit messy, and Erik guided me down a route (that CP nicely supports) - that my SpellingTest view should have the name/date of the test as well as an add word input field, but the list of current Words (which I had bunged into a table) - were actually more elegant as sub-components - hence a WordView - which renders a single word in a DIV, and for the edit screen I was creating, a Delete button next to the word (so you could delete it). So a 1 to many relationship essentials. This is where the announcements kick in (and lead to my ultimate question). When you click the Delete button, if I use a sub component - my view will generate a DeleteWordAnnouncement - which gets fed to my SpellingWordPresenter - however words in this sense donât naturally know their parent (the SpellingTest) - and its the parent test that has a #deleteWord: method. Iâve been taking with Erik, on different ways to elegantly handle this. a) you could change the model so words know their parent (in my case, Iâm using a 3rd party model for Flashcards, and they just donât know this - and adapting them would be a nuisance b) my TestPresenter could listen to announcements on the WordPresenter - and I could get some communications between presenters (although normally the Presenters just get events from Views, and pure domain models - so it feels a bit abnormal to consider another Presenter as a sort of model - but I could live with this c) given the composable nature of views/presenters (and CP is base on a WebComponent model) - you could bubble up Announcements, so that if an event isnât handled by a viewâs immediate presenter, you could re-route it to the parent of the View (the component owner) and see if itâs presenter could do something. I think (c) has a certain expectation to it - in fact when I converted my initial one-presenter attempt into components, I still had listener code in my TestPresenter that was expecting to get a deleteWord announcement and I was initially surprised that I wasnât getting it (as it was now just going to the Word component I had refactored out). So I wonder if others here would expect things to work this way too (and are there other examples in the wild that lead you here - or scare you away from this?). Back to my Announcement question - if C is a good idea - why doesnât the Announcer class let you check if if will handle a particular announcement? The API has #hasSubscriber: and #hasSubscriberClass: , but its missing: hasSubscriptionsHandling: anAnnouncement "Answer true if I have any subcribers to anAnnouncement" ^(registry subscriptionsHandling: anAnnouncement ) notEmpty And I am wondering if this is because it's a bad thing to expect to be able to check? In my case above, I would want to do this to know if CP should instead try announcing a message to a parent presenter because the current presenter wonât handle it. In my example above, my WordComponentView will broadcast that the delete button was clicked, but its actually a parent view which would reasonably want to listen to this kind of event and process the delete. And in a many words scenario (the Test has many words), its unrealistic for the parent to register to listen to each word component individually (in fact CP sort of hides this from you), however if you could listen to an event in your TestView, it seems to come out quite nicely - and looks a bit like this: viewCreated super viewCreated. self view when: CpNavigationAnnouncement do: [ :action | self model goto: action location ]; when: CpAddWordAnnouncement do: [ :action | self addWord: action data ]; when: CpDeleteWordAnnouncement do: [ :action | self deleteWord: action data ]. <â this is the one Iâm talking about So Iâm curious on the overall thought process here, but in particular whether I should even submit a PR on Announcer for #hasSubscriptionsHandling: ? Tim

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[ANN] Next Pharo Sprint: April 30
by Marcus Denker April 27, 2021

April 27, 2021

Next Pharo Sprint: April 30 We will organize a Pharo sprint / Moose dojo April 30 Goals of this sprint: - Fix issues from tracker https://github.com/pharo-project/pharo/issues - Especially checking older issues This is a Remote Sprint, it happens on Discord. http://pharo.org/contribute-events We have added a Board to coordinate the work: https://github.com/orgs/pharo-project/projects/9 A list of all Pharo Event of the year an be found here: https://association.pharo.org/events

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Re: Tabular for Pharo 9 and Git line ending conventions
by Bernhard Pieber April 26, 2021

April 26, 2021

Actually, it is even worse. All lines in all methods are shown as changed. > Am 26.04.2021 um 09:36 schrieb Bernhard Pieber <bernhard(a)pieber.com>: > > Hi, > > I made the Tabular tests to run on Pharo 9: > https://github.com/bpieber/Tabular > > However, due to different line endings all lines of all touched methods are shown as changed: > https://github.com/VincentBlondeau/Tabular/compare/master...bpieber:master > > The reason seems to be that in the repository the files use CRLF line endings while on my Mac the line endings are converted to LF. > > I experimented with all settings of core.autocrlf (true, false, and input). However, the result was always the same. > > Is there any way I can solve this problem? > > Is there a convention which line endings Pharo projects should have in the repository on GitHub? > > Cheers, > Bernhard

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Tabular for Pharo 9 and Git line ending conventions
by Bernhard Pieber April 26, 2021

April 26, 2021

Hi, I made the Tabular tests to run on Pharo 9: https://github.com/bpieber/Tabular However, due to different line endings all lines of all touched methods are shown as changed: https://github.com/VincentBlondeau/Tabular/compare/master...bpieber:master The reason seems to be that in the repository the files use CRLF line endings while on my Mac the line endings are converted to LF. I experimented with all settings of core.autocrlf (true, false, and input). However, the result was always the same. Is there any way I can solve this problem? Is there a convention which line endings Pharo projects should have in the repository on GitHub? Cheers, Bernhard

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Have you performed software migration or library update
by Oleksandr Zaytsev April 22, 2021

April 22, 2021

Hello, I am working on a paper about different types of library update (also known as library migration). And I would like to know if you have any experience that I could document. Most modern software depends on many external libraries. And when one of those libraries releases a new version, developers have to update their code according to the changes (e.g. stop using deprecated features, make use of the new functionality, replace old classes with new ones, etc.). Please let me know if you have ever updated your software to a new version of an external library. This may include Pharo libraries (for example, Spec -> Spec2, Roassal2 -> Roassal3, etc.), Java libraries (Maven, Xerces, Log4j, etc.), JavaScript, Python, or any other programming language. I would like to know how much time did it take you to update your code, what kind of changes did you have to make, what problems did you encounter, where did you look for the information on what was changed. I would be very grateful for your help! Oleksandr

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[ANN] Superluminal v2.1.0 [v2.1.0] released!
by Buenos Aires Smalltalk April 22, 2021

April 22, 2021

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