December 2020 - Pharo-users

PrintString in PBE8
by g_patrickb＠yahoo.com Dec. 29, 2020

Dec. 29, 2020

I started working through PBE8, and in section 3.13 there is a method: `Counter >> printOn: aStream ` `super printOn: aStream. ` `aStream nextPutAll: ' with value: ', count printString.` But it returns two warnings: \[printString\] No printString inside printOn Use cascaded nextPutAll:âs instead of #, in #nextPutAll: It has the option to automatically resolve the cascaded nextPutAll: which results in: `printOn: aStream` ` super printOn: aStream.` ` aStream` ` nextPutAll: ' with value: ';` ` nextPutAll: count printString` But it still has the warning about printString.

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Pharo and Virtual Realitity
by Alexandre Bergel Dec. 28, 2020

Dec. 28, 2020

Hello, With Victor we have been working on a Pharo programming environment entirely made in Virtual Reality. We need feedback from VR and Smalltalk / Pharo lovers. The url gives plenty of screenshots of the environment: https://github.com/Vito217/PharoVRIDE We need people to try it and give us feedback. We can go with you hand by hand. You just need to register here: https://docs.google.com/forms/d/1V-3mwG-JvbfgitoWdqr7H2qmh-fVlnui7LuNZ2qdwU… You need to have a VR device to participate. Cheers, Victor, Geoffrey, Leonel, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

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Pharo image size increases continuously
by Dario Romano Trussardi Dec. 23, 2020

Dec. 23, 2020

Ciao, I am developing a seaside based application in pharo Pharo 8.0.0 Build information: Pharo-8.0.0+build.1141.sha.1b7a8d8203fce2a57794451f555bba4222614081 (64 Bit) Seaside version 3.4.3 Grease Version 1.6.1 Iceberg 1.6.7 The Pharo image size increases continuously and now we are at: 15213731 Dec 23 13:20 Pharo80041-201223D.changes 280245832 Dec 23 13:20 Pharo80041-201223D.image The system begins to be unstable. Until a few days ago, closing all the System Browser windows and saving the image the system resized itself. But now this trick doesn't work either. Any suggestions on how to solve, manage this question? Thanks, Dario

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About BitBlt for non graphical problems
by Rafael Luque Dec. 23, 2020

Dec. 23, 2020

Hi all, I remember to read in the Blue Book about a Game Of Life solution based on the BitBlt operation. I wondered if it was only a smart and elegant demonstration or it may be a useful tool in the case you need parallelism, even in non-graphical contexts. I've never seen BitBlt used to solve non-graphical problems, but I don't have experience with BitBlt in my everyday work, so maybe I'm biased. I've found a paper by Leo J. Guibas and Jorge Stolfi ( https://www.cs.tufts.edu/~nr/cs257/archive/leo-guibas/language-bitmap.pdf) about a "calculus of bitmap operations" including an specific language called MUMBLE, but I suspect it is not a common use case. Anyway, I've experimented with this option to solve the Advent of Code's Day 3 challenge. The puzzle consists of counting the number of trees you will encounter traversing a given map with open squares and trees, starting at the top-left corner and following a certain slope (( https://adventofcode.com/2020/day/3) After implementing the straight-forward and iterative solution, I tried using Form instances representing the map and the slope and a BitBlt operation for ANDing both forms in order to leave only bits where you encounter a tree (see attached image). In this alternative solution I like how the iteration is replaced by only one "BitBlt>>copyBits" operation. Additionally, I understand that BitBlt operations are native primitives that could be hardware optimized. However, I didn't know how to count the resulting bits without recurring again to the iteration of the Form's bits. This is my current implementation: AoCBitBltForestMap>>countTreesOnPath | mapForm | mapForm := self form. (BitBlt toForm: mapForm) copyForm: self slopeMaskForm to: 0 @ 0 rule: Form and. ^ mapForm bits count: [ :bit | (Color colorFromPixelValue: bit depth: 32) green closeTo: 1 precision: 0.1 ] You can find all the sources at the following repository: https://github.com/luque/AdventOfCode2020 Any comments about BitBlt use cases or this specific puzzle will be of interest for me. Thank you.

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subclassResponsibility
by Jimmie Houchin Dec. 23, 2020

Dec. 23, 2020

Hello, I have created a class which will have many subclasses some of which will have subclasses of their own. I want every single class to implement a class method #shortName which will provide a short string as a human readable short identifier to the object. I have in the highest superClass shortName Â Â Â self subclassResponsibility But the moment I implement it in a subclass which has subclasses. Those subclasses are now using their closest superClasses implementation. Is there a way force allSubclasses to implement the method? Thanks. Jimmie

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How coverage is computed with SmalltalkCI and coverall
by StÃ©phane Ducasse Dec. 21, 2020

Dec. 21, 2020

Hi I would like to know exactly how the test coverage is computed. I read all the code of SmalltalkCi and I could not find it. 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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Monticello
by Ramon Leon Dec. 16, 2020

Dec. 16, 2020

Hi, I wonder if anyone is familiar enough with Monticello to know how to code up a quick commit history report showing all commits and comments for a given date range? -- RamÃ³n LeÃ³n http://onsmalltalk.com

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[ Article ] Understanding Base58 Encoding - It is all about integers
by Sven Van Caekenberghe Dec. 15, 2020

Dec. 15, 2020

Hi, I wrote and published another article in Concerning Pharo: Understanding Base58 Encoding It is all about integers https://medium.com/concerning-pharo/understanding-base58-encoding-23e673e37… This introductory article shows a bit how easy and how much fun it is to do integer and binary encoding and decoding as well as printing and parsing in Pharo. It also tries to explain Base58 Encoding from a first principles point of view. Sven

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Pharo Mars still not working on Ubuntu
by kmo Dec. 14, 2020

Dec. 14, 2020

I see that the Pharo-Mars code has recently been split into two projects. Unfortunately this has still not fixed the problem with Ubuntu. It is still totally impossible to run pharo mars on ubuntu. Now just loading the GTK-bindings package into ubuntu causes a segfault. This is actually going backwards - at least you used to be able to load the code into pharo, even though it crashed if you tried to use it. i flagged this up in May. I'm beginning to think I'll be dead before I see Ubuntu running Pharo-Mars. -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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[ANN] Next Pharo Sprint: Dec 18
by Marcus Denker Dec. 14, 2020

Dec. 14, 2020

We will organize a Pharo sprint / Moose dojo Dec 18 (this Friday). This is a bit earlier due to Christmas times. Goals of this sprint: - Fix issues from tracker https://github.com/pharo-project/pharo/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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