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

Private Methods
by Craig Johnson Aug. 23, 2021

Aug. 23, 2021

Hi All, Just a newb off-the-wall question. Is there any good reason why we can't create a true private method in a Pharo class by putting that method inside an instance or class variable as a lambda (block). This would reduce one of my biggest bugbears with Pharo, namely the pollution of the global namespace with every single message name in the entire system. Craig

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[ANN] Stargate v6.1.1 [v6.1.1] released!
by Buenos Aires Smalltalk Aug. 20, 2021

Aug. 20, 2021

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UK Smalltalk User Group Meeting - Wednesday, August 25th
by Giovanni Corriga Aug. 16, 2021

Aug. 16, 2021

The next meeting of the UK Smalltalk User Group will be on Wednesday, August 25th. Marcus Denker will talk about Variables in Pharo. We like to say that âEverything is an Objectâ in Smalltalk. This is true in many cases: Classes, methods, even the execution stack are reflectively available as objects. This talk shows how this idea can be extended to Variables and how Pharo implements first-class Variables for Globals, instance Variables, Class Variables, and even temporary variables. This presentation explores the Variable hierarchy, shows how variables simplify the compiler and how the reflective API provided by variables is used by the debugger. In a hands-on tutorial, we extend the language by defining new kinds of Variables. Marcus ( https://marcusdenker.de/ ) is a permanent researcher at INRIA Lille - Nord Europe ( http://www.inria.fr/lille/ ). Before, he was a postdoc at the PLEIAD lab/DCC University of Chile and the Software Composition Group, University of Bern. His research focuses on reflection and meta-programming for dynamic languages. Marcus Denker received a PhD in Computer Science from the University of Bern/Switzerland in 2008 and a Dipl.-Inform. (MSc) from the University of Karlsruhe/Germany in 2004. He co-founded Zweidenker GmbH ( https://zweidenker.de/ ) in 2009. Given the current COVID-19 restrictions, this will be an online meeting from home. If you'd like to join us, please sign up in advance on the meeting's Meetup page ( https://www.meetup.com/UKSTUG/events/cbklbrycclbhc/ ) to receive the meeting details. Donât forget to bring your laptop and drinks!

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File-in Issue - Pharo 9
by Craig Johnson Aug. 16, 2021

Aug. 16, 2021

Hi All, I just filed-out a small project that I playing with, and refreshed the image.Â The new image cannot file-in the package from the File Browser. "Instance of RubSmalltalkEditor did not understand #fileItIn". Is there another way to file-in the package? Thanks Craig

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Re: Exercism v3 problems
by Roelof Wobben Aug. 16, 2021

Aug. 16, 2021

I understand. Hopefully someone can and is willing to help me and we can give the user the experience he/she needs. I think that what you have said earlier, could be very in hand. That Syunit could be working standalone. > Op 15 augustus 2021 om 23:16 schreef "stephane.ducasse(a)free.fr" <stephane.ducasse(a)free.fr>: > > > Thanks for the info. > > I read a bit the âspecâ > I do not really get the test method cannot be passed? Anywayâ¦. > > > This is the body of the command that is being tested. For example, the following Ruby test: > > def test_duplicate_items_uniqs_list > cart = ShoppingCart.new > cart.add(:STARIC) > cart.add(:MEDNEW) > cart.add(:MEDNEW) > assert_equal 'Newspaper, Rice', cart.items_list > end > should return a test_code value of: > > "cart = ShoppingCart.new > cart.add(:STARIC) > cart.add(:MEDNEW) > cart.add(:MEDNEW) > assert_equal 'Newspaper, Rice', cart.items_list" > Looking at the other implementation can help. > > https://github.com/exercism?q=-test-runner > > Now my plate is more than full. So I cannot really help because I have too many things unfinished and that should be done. > > S > > > > On 15 Aug 2021, at 21:02, Roelof Wobben <r.wobben(a)home.nl> wrote: > > > > Yep, > > > > The spec and other information can be found here : https://github.com/exercism/docs/blob/main/building/tooling/test-runners/in… <https://github.com/exercism/docs/blob/main/building/tooling/test-runners/in…> > > > > I hoping we can get number 2 or 3 working. > > > > Roelof > > > > > > > > Op 15-8-2021 om 15:15 schreef stephane.ducasse(a)free.fr <mailto:stephane.ducasse@free.fr>: > >> > >>> Yes, > >>> > >>> There are already some test which are written with Sunit from v2 challenges. > >>> and for the new one I could write the tests. > >>> > >>> But what I mean is that exercismv 3 wants that the code written by a student is submitted and that then the tests are run and a json file with if a test is successfull or with the tests errors is made. > >> > >> We do that for our server (not Json). > >> Do you have a spec of what should be the output? > >> It could be occasion for us to extract a runner and strengthen the logic of the test execution. > >> S > >> > >>> > >>> On v2 the tests were on the same image as the code written by a student. > >>> > >>> Roelof > >>> > >>> > >>> > >>> Op 13-8-2021 om 22:14 schreef stephane.ducasse(a)free.fr <mailto:stephane.ducasse@free.fr>: > >>>> Hi > >>>> > >>>>> As far as I see it standalone means work without a image. > >>>>> all the other test-runners run in a vm as far as I know how exercism works. > >>>> > >>>> Nope. :) > >>>> You see in ruby or python or Javascript, you cannot run a software without a kernel (and a kernek is an image that cannot be saved and it often created > >>>> using some hardcoded C code - but this is the same). They just cannot save the kernel once loaded with libraries but this is the same. > >>>> > >>>> So if we can load tests and execute tests without clicking on a button interactively. > >>>> Yes we can. > >>>> > >>>> This is what we are doing since we have the jenkins test runner (since 2009 or before) and this is what you have when you > >>>> run tests on travis or github actions. > >>>> > >>>> So now the point is to know if their infrastructure needs a script to run the tests > >>>> - how to identify them > >>>> - how to execute them > >>>> > >>>> Because in Pharo we can write tests, identify them and execute them > >>>> Interactively but also from the command-line. > >>>> > >>>> Did you already write a test? > >>>> Because if not, it super super important and I will release some a booklet on Testing in Pharo. > >>>> and also a new chapter ofr Pharo by example 9 > >>>> > >>>> https://pharoweekly.wordpress.com/2021/08/04/ann-chapter-sunit-of-pharo-9-b… <https://pharoweekly.wordpress.com/2021/08/04/ann-chapter-sunit-of-pharo-9-b…> > >>>> > >>>> S > >>>> > >>>>> > >>>>> Roelof > >>>>> > >>>>> > >>>>> > >>>>> Op 13-8-2021 om 21:50 schreef stephane.ducasse(a)free.fr <mailto:stephane.ducasse@free.fr>: > >>>>>> Hello > >>>>>> > >>>>>> Can you be more specific because Pharo got since day 0 (and I would say even before) a test runner? > >>>>>> The SUnit framework is there already. > >>>>>> We were thinking to extract a runner object to make it first class from the core framework. > >>>>>> But beside that it is working, maintained, extended (now we have parametrised tests) and we have (I should publish it) supports for example (tests without setUp) > >>>>>> > >>>>>> Then what is standalone? > >>>>>> > >>>>>> S. > >>>>>>> > >>>>>>> Hello, > >>>>>>> > >>>>>>> > >>>>>>> For the new version of exercism which is due in a few weeks, the pharo track needs a test-runner, > >>>>>>> > >>>>>>> a example of that can be found here : https://github.com/exercism/ruby-test-runner/tree/main/lib <https://github.com/exercism/ruby-test-runner/tree/main/lib> <https://github.com/exercism/ruby-test-runner/tree/main/lib <https://github.com/exercism/ruby-test-runner/tree/main/lib>> > >>>>>>> > >>>>>>> > >>>>>>> first question : Can this be easily be done in pharo? > >>>>>>> > >>>>>>> second question : can it also be standalone? > >>>>>>> > >>>>>>> > >>>>>>> Regards, > >>>>>>> > >>>>>>> > >>>>>>> Roelof > >>>> > >>> > >> > >> > > >

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Re: Exercism v3 problems
by Roelof Wobben Aug. 15, 2021

Aug. 15, 2021

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ABBench: Lightweight Microbenchmarking Library
by Evan Donahue Aug. 15, 2021

Aug. 15, 2021

Hello, I've just released a utility I've been using for the past few years to help optimize Pharo code. It's a library that makes it easy to check whether an optimization has improved performance by wrapping the optimization and the old code in an if block and executing the optimized and unoptimized paths repeatedly under the same runtime conditions to determine which is faster. Basic usage is to wrap changes to the code in if blocks like so: ABBench a: [ ...existing code...] b: [...optimized code...] And then run the A/B test by printing: ABBench bench: [...some main method...] I have found it to make performance testing simple and quick enough that I actually do it. Perhaps someone else will find it useful. Install with: Metacello new githubUser: 'emdonahue' project: 'ABBench' commitish: 'master' path: ''; baseline: 'ABBench'; load. More details can be found here: https://github.com/emdonahue/ABBench Cheers, Evan

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Pharo-SQLite3: closing connections immediately and deleting the database file
by vinref＠gmail.com Aug. 13, 2021

Aug. 13, 2021

Hi I like to develop my db schema as I develop the code - TDD-style. So I need to keep dropping the database each and every time I need to update the schema and rerun the code. The problem is that even though I close the connection using #ensure: the reference remains and I cannot delete the database file immediately. ``` buildSchema ``` ``` | fp | ``` ``` ``` ``` (fp := self dbFilePath asFileReference) exists ``` ``` ifTrue: [ fp delete ]. ``` ``` ``` ``` [ ``` ``` self db beginTransaction. ``` ``` self writeSchema; writeData. ``` ``` self db commitTransaction ] ensure: [ self cleanUp ] ``` I even tried running this before everything else to no avail: ``` SQLite3Connection allInstancesDo: [ :each | each close ]. ``` ``` SmalltalkImage cleanUp. ``` ``` SmalltalkImage current garbageCollect. ``` I keep getting a #CannotDeleteFileException because there is still a reference to the database file. If I do wait a seemingly random amount of time, the reference is cleared. How can I get the VM to release the reference to the database file immediately? Pharo 8/64-bit, Windows 10 Regards, Vince

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Exercism v3 problems
by r.wobben＠home.nl Aug. 10, 2021

Aug. 10, 2021

Hello, For the new version of exercism which is due in a few weeks, the pharo track needs a test-runner, a example of that can be found here : https://github.com/exercism/ruby-test-runner/tree/main/lib first question : Can this be easily be done in pharo? second question : can it also be standalone? Regards, Roelof

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Logging Frameworks
by Esteban Maringolo Aug. 9, 2021

Aug. 9, 2021

What are the current options for logging? Beacon seems to be the most modern one, but the Github repository doesn't seem very active (maybe it forked somewhere else). Given that the logs might come from different worker images, is there something that can work via HTTP or similar? (it is, forwarding the logged events to a server). Regards! ps: I think I've asked this before, but couldn't find my previous question about it. Esteban A. Maringolo

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