December 2020 - Pharo-users

EXIF / JPEG metadata
by Alistair Grant Nov. 30, 2025

Nov. 30, 2025

Hi Everyone, As far as I can tell, JPEGReadWriter in Pharo 7 doesn't read (or write) the image metadata, e.g. title, keywords, exposure time, etc. Is anyone aware of a package that does? Thanks! Alistair

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Re: [Pharo-users] Personal wiki / information manager
by Evan Donahue Sept. 25, 2023

Sept. 25, 2023

Seems that Pharo is a magnet for this kind of project. I've been writing one as well and using it to organize my research notes. Does anyone working on personal info mgmt tools want to talk offline? I expect we're running into some of the same issues, both conceptual and technical. Evan

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WebDav and CalDav in Pharo ?
by CÃ©drick BÃ©ler April 13, 2022

April 13, 2022

Hi all, I do some experiments with iCal. For now I serve a full calendar over HTTP. Not bad, but it is read only. Iâd like to try CalDAV. I was looking for it, and also webDAV. Gofer it smalltalkhubUser: 'UdoSchneider' project: 'FileSystemNetwork'; configuration; load. #ConfigurationOfFileSystemNetwork asClass project stableVersion load: 'Webdav' Iâve found the project of Udo, but it doesnât load on P8. I think this is due to the stream refactoring. Right now the image hung. Iâll try maybe to load it manually. But I was wondering oof there were other alternatives ? TIA, CÃ©drick

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How to flatten traits
by Jupiter Jones Nov. 22, 2021

Nov. 22, 2021

Hi All, There used to be a method to #flattenDownTraits that I canât find the equivalent in Pharo 8. How do you go about flattening traits now? Thanks for any advice. Cheers, J

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Rounding in Floats
by Esteban Maringolo June 17, 2021

June 17, 2021

Hi, Continuing with my issues with decimals, I'm having one issue that is not clear to me why it happens. If I do: (9.1 + (-2.0)) roundTo: 0.1. "7.1000000000000005" I expect to get a single decimal Float (rounded with whatever precision, but a single decimal). Even if I do something like this: 7.1 roundTo: 0.1 It gives the wrong result. In VW and VAST it provides the right result. (9.1 + (-2.0)) roundTo: 0.1 "7.1" In Dolphin it also returns the wrong result, it seems to use the same algorithm to round it. Is this a bug? Esteban A. Maringolo

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Class hierarchy diagram
by Sanjay Minni May 6, 2021

May 6, 2021

Is there any way to display the Class Hierarchy as a Diagram or a indented list. Even for all the classes in a package will do. ----- cheers, Sanjay -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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pharo 8 - method versions - how to see author/timestamp?
by PAUL DEBRUICKER Feb. 8, 2021

Feb. 8, 2021

Hi - Sometimes I want to revert to older versions of methods e.g. from an hour ago. In the "Recent versions of MyClass>>#myMethod" dialog no timestamps or authors are present. How do I see those? Thanks Paul

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Magritte
by Sanjay Minni Jan. 25, 2021

Jan. 25, 2021

Hi I am posting here instead of the Magritte group as the readership is high. Is Magritte a robust enough package for an application with a large number of forms and sub forms. This is to be used in Pharo9 + Seaside +Willow. I am putting this question as i do not see much mention of Magritte in forums / discord of late, whereas by its description the package seems to fit a space for applications with many domain objects and associated forms. regards Sanjay ----- cheers, Sanjay -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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Can a class be not equal to itself?
by Konrad Hinsen Jan. 2, 2021

Jan. 2, 2021

Hi everyone, It's been a while since I have encountered mysterious behavior in Pharo, but today it happened. I set up a dictionary with classes as keys, and got "Key not found" errors for keys that were definitely in my dictionary. A quick debugging session showed the underlying issue: I had two references to a class which look the same when inspected, but turn out to be not identical (==) and thus not equal (=). How can this happen? Konrad.

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[exercism bowling challenge] Is there a better way to do this
by r.wobben＠home.nl Jan. 2, 2021

Jan. 2, 2021

Hello, To come back at this one. I made a class Bowling and a class Frame which contains two instance variables named firstThrow and secondThrow. but I still wonder how do I know which one to fill in. I can do \` (firstThrow nil?) \` but that feels not right. \ Is there a more idiomatic solution for this ? Roelof

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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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Dec. 13, 2020

Dear happy Pharoers and others, Over the last months we have been working on the implementation of a MIT-licensed ARMv8 Just-In-Time compiler for Pharo VM. We are very happy with the advance on this subject, as we have not only implemented a new backend but we have added more than 2500 tests to the JIT, the primitives, code generation, plugins and the VM in general. In the process we fixed many problems. It shows that following the roadmap that was decided during General assembly of PharoDays, we have been investing in the Pharo VM and that our efforts are greatly paying off. Also, we are generating a lot of documentation and improving the process to really democratize the development of the VM. So Pharo is a better shape than ever on such matter and this opens a lot of possibility for the future. ## Call for Beta-Testers We would like to announce that a first version of our JIT backend is available for beta-testing for ARM Linux machines using Ubuntu. We are now entering into a beta testing stage of the VM and the image in Ubuntu ARM 64. We would like to invite you to our beta testing phase for the VM. If you're interested in participating, please contact pablo.tesone(a)inria.fr. The following sections give more details of the current status, and the following steps including Apple Silicon, Windows ARM64 and Linux Open Build System support. ## Current Status Our objective is to have a running JIT for the new aarch64 architecture (ARM 64bits). This task includes not only a new backend for the JIT compiler but also adding support for external libraries, dependencies and the build process. This means having a working VM with comparable features as the one existing in Intel X64. We are targeting all the major operating systems running in this platform (Linux, OSX, Windows). Each of them present different restrictions and conditions. This is the current status: - We implemented a full backend for the JIT compiler targeting aarch64. - All the image side was adapted to run on it, tested on Ubuntu ARM 64 bits. - We added support for: Iceberg (Libgit) / Athens (Cairo) / SDL / GTK - We implemented a LibFFI-based FFI backend as the default one for Pharo 9 in aarch64 (next to come in all platforms). This opens the door to ease port the features to other platforms and OSes. ## Following Steps and Open Betas: Linux Open Build System (OBS), Windows ARM64 and Apple Silicon Linux Systems: In the following days, we will also support Raspbian (Debian) and Manjaro on ARM64. For doing so, we are pushing the last details in having a single Linux build system through OBS. So, if you want to start doing beta-testing of these versions please contact us. A public beta will be open in around two weeks. Windows Systems: We have extended the build process to fully support Microsoft Visual Studio compilers and more flexibility to select the targets, also we are building it to run in Windows ARM. To correctly run the VM in Windows it is needed to build all dependencies for aarch64. In the following weeks, we expect to have a working Non-JIT version and a JIT version. The remaining points to have a JIT version are related with the build process as the API of the operating system has not changed from X64 to aarch64. OSX Systems: Our third target is to have a working version for the newest Apple silicon. We are acquiring the corresponding hardware to test and to address the differences in the API exposed to JIT applications. As it is the case of the Windows VM, there is not need to change the machine code generation backend; but to compile external libraries, and particularities of the new OS version. Thanks for your support, and again, if you like to start beta testing the VM please contact us. In the meantime, we will continue giving you news about the current state and where are we going. The consortium would like to particularly thank Schmidt Buro and Lifeware for their contracts. Regards, Pablo in behalf of the Pharo Consortium Engineers -------------------------------------------- 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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Please explain self
by g_patrickb＠yahoo.com Dec. 13, 2020

Dec. 13, 2020

I understand if you have Class A with methods p and q that you can call q from p doing: self q But there are some cases where a method doesnât exist but self is still used. I found a tutorial on creating a Reddit type app and it had a .mcz which I loaded. Here is an example from Class StLoggedInComponent and method refreshReport: self report rows: (self session user tasks select: self filterBlock). There is a method âreportâ so I understand that, but there is no method named âsessionâ so what is the use of self? And Class StDatabase has method âupdateTask:â has: self subclassResponsibility. But no method called âsubclassResponsibilityâ exists in the Class. Also, Class StLoggedInComponents has method âtestTasksâ with this: ^ self class testTasks What is âself classâ? Thank you.

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UK Smalltalk User Group Meeting - Wednesday, December 30th
by Giovanni Corriga Dec. 11, 2020

Dec. 11, 2020

The UK Smalltalk User Group will have an extra meeting this year on Wednesday, December 30th. feenk's Tudor Girba will present the latest in moldable development with Glamorous Toolkit. Moldable development is an approach to programming through which we make the inside of software systems explainable. Glamorous Toolkit makes it practical. And beautiful. 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/275119813/ ) to receive the meeting details. Donât forget to bring your laptop and drinks!

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Trouble with checking out from Github
by Petter Dec. 10, 2020

Dec. 10, 2020

Hi, I have three computers and two of these, one Linux and one Mac works excellent with Iceberg. But I have a difficult child, one laptop where I can not checkout code from a private github repo. It keeps running into stacktrace, nomatter which strategy I select. Problems does not seem to be connected to versions. I have tried different versions of Pharo images, from 8-stable to 9-bleeding edge. I have ticked the ssh-setting in Pharo for using custom keys and verified that these exists and has right permissions. Checkout from ssh in shell works fine. I have tried these strategies. 1) Using the add-key trick which is referred as a solution on this, like in ssh-add ~/.ssh/id_rsa This always results in stacktrace in Pharo. 2) Checking out as as github-repo with ssh, same problem 3) Checking out as a git-repo, same problem 4) Generated new ssh-keys and tried to setup these as the default keys Same stack trace problem in Pharo. 5) Checking out over https This does not work either. The ssh-checkout box appears in Pharo even though I select this specifically. Checking out over https-does not seem to be working at all? Version on ssh on my laptop is: ssh: OpenSSH_8.1p1, LibreSSL 2.7.3 mac: Catalina 10.15.6 Interesting enough I have the same versions on my working mac. Only difference is that the default ssh-key is with a passphrase on the non-working computer (entering this in the ssh does not help, creating a new ssh-keypair without a passphrase does not make a difference either). ssh_config is also equal on the two computers. Has anybody solved a case like this or has any clues? This beats me :) And when Iceberg is up and running I must say it is really a valuable and nice tool, thx! Petter -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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Dec. 9, 2020

Roassal presentation to JPL (Nasa lab :)). S > Begin forwarded message: > > From: "Brunzie, Ted J (US 337C)" <ted.j.brunzie(a)jpl.nasa.gov> > Subject: Re: [EXTERNAL] Re: Opening presentation of the JPL Open Developer seminar series > Date: 8 December 2020 at 21:54:42 CET > To: StÃ©phane Ducasse <stephane.ducasse(a)inria.fr> > Cc: Pablo Tesone <pablo.tesone(a)inria.fr>, Steven Costiou <steven.costiou(a)inria.fr>, denker <marcus.denker(a)inria.fr>, Esteban Lorenzano <esteban.lorenzano(a)inria.fr> > -------------------------------------------- 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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