March 2022 - Pharo-users - lists.pharo.org

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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ESUG 2022 call for presentations & Call for student volunteers
by stephane ducasse April 23, 2022

April 23, 2022

ESUG 2022 Novisad Serbia 22. â 26.8. https://esug.github.io/2022-Conference/call2022.html You can support the ESUG conference in many different ways: Sponsor the conference. New sponsoring packages are described at http://www.esug.org/supportesug/becomeasponsor/ <http://www.esug.org/supportesug/becomeasponsor/> Submit a talk, a software or a paper to one of the events. See below. Attend the conference. We'd like to beat the previous record of attendance (170 people at Amsterdam 2008)! Students can get free registration and hosting if they enroll into the the Student Volunteers program. See below. <>Developers Forum: International Smalltalk Developers Conference We are looking for YOUR experience on using Smalltalk. You will have 30 min for presentations and 45 min for hands-on tutorials. The list of topics for the normal talks and tutorials includes, but is not limited to the following: XP practices, Development tools, Experience reports Model driven development, Web development, Team management Meta-Modeling, Security, New libraries & frameworks Educational material, Embedded systems and robotics SOA and Web services, Interaction with other programming languages <>Teaching Pearls and Show us Your Business New this year!!! We added two types of sessions in addition to the regular talks and show us your projects sessions. Show your business 10 min session (Get prepared!!) Teaching pearls : we want some session on how to teach some design aspects. We want your tip and tricks to teach Smalltalk or OOP. We expect to have several 10 to 15 min sessions aggregated. <>How to submit? Make a Pull Request here https://github.com/ESUG/esug.github.io/tree/source/2022-Conference/talks Or but only if you are not connected to the worldâ¦ send an email to stephane.ducasse(a)inria.fr Title: [ESUG 2022] Please follow the template below the email will be automatically processed! Name: Email: Abstract: Bio: Call for Student Volunteers Student volunteers help keep the conference running smoothly; in return, they have free accommodations, while still having most of the time to enjoy the conference. Pay attention: the places are limited so do not wait till the last minute to apply. Conference details: Send an email to stephane.ducasse at inria.fr and serge.stinckwich at gmail.com with: title: [ESUG 2022 Student] name, gender, university/school, country, email address short description of you and why you are interested in participating For which period is accommodation covered? Accommodation is covered from Sunday 21 August until Friday 26 August 2022 (including nights from Sunday to Monday and from Thursday to Friday). Students will be hosted in student rooms. ESUG additionally covers for the lunches during the week and one dinner. Duties include handling registration as people arrive at the conference, filling coffee machines, collecting presentation slides for ESUG right after the presentation is given, being present at an information desk to answer questions, and generally being helpful. Student volunteering makes the conference better, takes a fairly small amount of time and doesn't significantly interfere with enjoying and learning from the conference. Please Note, this role requires discipline and constant attention to all attendees. Information about hotel Student Volunteer rooms are booked at (to be announced). If you are student volunteer, do not book yourself, we have arranged the booking already!

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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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Re: [Esug-list] [PDFtalk] Porting to non-namespace Smalltalks
by stephane ducasse March 28, 2022

March 28, 2022

BTW about porting from VW, you see a friend of mine wanted to see how to help porting Siren to Pharo. Now this is not possible because he could not get a personal VW license. So even if people want to help pointing to a store database is equivalent to /dev/null for most people. For example I cannot (and also does not for legal reason) run VW on my machine. Not talking about the new M1 I will get. S > On 27 Mar 2022, at 22:12, seasidebook <seasidebook(a)free.fr> wrote: > > Hi christian > > I took the squeakValues60 becau se I thought that this is what you wanted that we do. > I should continue but Iâm busy > > > ahhh I did not know that you already did it. > Do you need help to package your changes? > Because you can fork my repo and load your changes. > > I got lost with the explanation of OrderedDictionary below because Iâm dead :) - worked too mcuh today. > But what we can do is to package the one that is working for you under http://github.com/pharo-container <http://github.com/pharo-container> > and update the baseline to load it. > Alternatively we could see what is wrong in the pharoâs one. > > Now my brain decided to shut down :) so I need to sleep. > > S > >> Hi Stef, >> >> Great! Thank you for your work. >> Good example for the tonel format. >> >> Which sources were you using? >> How did you generate this? >> Do you use VW to create the output? >> >> >> For the last ESUG (2.5 years ago â sigh), I already did the transformation for Values for Pharo. Thanks to you, I revised them and published the result on GitHub (https://github.com/PortingPDFtalk/PharoValues <https://github.com/PortingPDFtalk/PharoValues>) and added a Pharo porting page to the wiki (https://wiki.pdftalk.de/doku.php?id=pharoport <https://wiki.pdftalk.de/doku.php?id=pharoport>). Please have a look. >> >> The fileouts are for Pharo versions 6.1, 7.0, 8.0 and 9.0 (7.0 to 9.0 have identical sources). The sources load without errors or warnings and all 27 tests pass. >> >> >> Some of the problems in your code have to do with OrderedDictionary as superclass of Valuemap. When I did my first round on the port, I had a class OrderedDictionary in my Values implementation. Unfortunately, OrderedDictionary does not work as I expected. >> >> (OrderedDictionary with: #a -> 1 with: #b -> 2) = (OrderedDictionary with: #b -> 2 with: #a -> 1) >> >> answers true, although the order is different. Therefore, it cannot be used as value. >> >> Instead of raising this issue on a Pharo list (sorry), I decided to use a new name: Valuemap. >> A Valuemap is an OrderedDictionary where the order is relevant for comparisons. >> Squeak had the same problem where it was considered a bug and fixed. >> While I subclass Dictionary for Valuemap in Pharo, I can use OrderedDictionary in Squeak. This removes a lot of methods from the fileout. >> >> >> A remark about the renamings you propose in your commit comment. >> Thank you for the suggestions, but I decline for two reasons: >> Names for classes, methods and variables are very important to me. Naming is part of the creative expression of the code author. I do think much about the right names and therefore, I claim the liberty and right to name things according to my feeling. > > Yes now you may want to read an excellent book that just came out: http://books.pharo.org <http://books.pharo.org/> Pharo with Styles. > If you want to have future contributors this is good to follow good practices > Else Iâm quite sure that you would not like a French Pharo :) > >> Maybe my names are a bit influenced by German, where we tend to have longer names. Therefore, my names are not so heavily camel-cased J. In contrast, Pharo has quite a different style with a love for camel-casing J (#timeStamp, #nanoSeconds etc.). >> From a practical view, it would be a lot of work to rename all references to the items in this basic systems library. There is a lot of code out there using it. Of course, if there is a good reason for a renaming (like a spelling mistake or misleading name), it should be done and I am appreciating any suggestions. > > A pattern that we use is the following. > You introduce a new name and let the old one as an empty subclass. Like that you can migrate and still be backward compatible. > > For the method level refactoring we have a gorgeous mechanism that automatically rewrite client codeâ¦. > > http://www.jot.fm/issues/issue_2022_01/article1.pdf <http://www.jot.fm/issues/issue_2022_01/article1.pdf> > > S

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Re: [Esug-list] [PDFtalk] Porting to non-namespace Smalltalks
by christian.haider＠smalltalked-visuals.com March 28, 2022

March 28, 2022

Hi Stef, Great! Thank you for your work. Good example for the tonel format. Which sources were you using? How did you generate this? Do you use VW to create the output? For the last ESUG (2.5 years ago Â sigh), I already did the transformation for Values for Pharo. Thanks to you, I revised them and published the result on GitHub (https://github.com/PortingPDFtalk/PharoValues) and added a Pharo porting page to the wiki (https://wiki.pdftalk.de/doku.php?id=pharoport) Please have a look. The fileouts are for Pharo versions 6.1, 7.0, 8.0 and 9.0 (7.0 to 9.0 have identical sources). The sources load without errors or warnings and all 27 tests pass. Some of the problems in your code have to do with OrderedDictionary as superclass of Valuemap. When I did my first round on the port, I had a class OrderedDictionary in my Values implementation. Unfortunately, OrderedDictionary does not work as I expected. (OrderedDictionary with: #a -> 1 with: #b -> 2) = (OrderedDictionary with: #b -> 2 with: #a -> 1) answers true, although the order is different. Therefore, it cannot be used as value. Instead of raising this issue on a Pharo list (sorry), I decided to use a new name: Valuemap. A Valuemap is an OrderedDictionary where the order is relevant for comparisons. Squeak had the same problem where it was considered a bug and fixed. While I subclass Dictionary for Valuemap in Pharo, I can use OrderedDictionary in Squeak. This removes a lot of methods from the fileout. A remark about the renamings you propose in your commit comment. Thank you for the suggestions, but I decline for two reasons: 1. Names for classes, methods and variables are very important to me. Naming is part of the creative expression of the code author. I do think much about the right names and therefore, I claim the liberty and right to name things according to my feeling. Maybe my names are a bit influenced by German, where we tend to have longer names. Therefore, my names are not so heavily camel-cased :). In contrast, Pharo has quite a different style with a love for camel-casing :) (#timeStamp, #nanoSeconds etc.). 2. From a practical view, it would be a lot of work to rename all references to the items in this basic systems library. There is a lot of code out there using it. Of course, if there is a good reason for a renaming (like a spelling mistake or misleading name), it should be done and I am appreciating any suggestions. Happy hacking, Christian Von: seasidebook <seasidebook(a)free.fr> Gesendet: Donnerstag, 24. MÃ¤rz 2022 21:04 An: Any question about pharo is welcome <pharo-users(a)lists.pharo.org>; Pharo Development List <pharo-dev(a)lists.pharo.org> Cc: christian.haider(a)smalltalked-visuals.com Betreff: Re: [Esug-list] [PDFtalk] Porting to non-namespace Smalltalks Hi guys I started to port Values to Pharo. If you want to give an hand my current effort is here. <https://github.com/Ducasse/PharoValues> https://github.com/Ducasse/PharoValues should migrate license and other stuff too. S On 1 Mar 2022, at 19:08, <mailto:christian.haider@smalltalked-visuals.com> christian.haider(a)smalltalked-visuals.com wrote: Hi all, PDFtalk is a PDF library for VisualWorks[1]. The library has been ported successfully to Gemstone[2]. Now, there is interest from companies in a port to Squeak and VA Smalltalk. The project[3] has started and we are making good progress. The first step: porting the Values package. This is easy, because there are no namespace issues. The next step is to implement class renamings so that namespaced classes can be renamed to global prefixed names. Then PDFtalk with all its components, except for the UI, can be ported. The porting approach is different to the traditional way of loading and fixing. The import files for other Smalltalks are generated from VisualWorks where the code is transformed by declarative rules. The approach is documented in [4]. I set up a GitHub organization for this project[5]. There, the fileouts for each dialect are published (Gemstone, Squeak and VA Smalltalk so far), so that people without VisualWorks can work with the code in their Smalltalk. Also, I record and explain all steps of the porting process for Squeak in great detail[6], so that people can follow it. I would like to invite Smalltalkers from all dialects to take part in this project. The code transformations for Squeak will be quite similar to the ones needed for Pharo and Cuis. Therefore, each port to one Smalltalk will help the port to other Smalltalks. Any takers? Happy hacking, Christian [1] <https://wiki.pdftalk.de/doku.php?id=start> https://wiki.pdftalk.de/doku.php?id=start [2] <https://wiki.pdftalk.de/doku.php?id=pdftalk4gemstone> https://wiki.pdftalk.de/doku.php?id=pdftalk4gemstone [3] <https://wiki.pdftalk.de/doku.php?id=pdftalknonnamespacefileout> https://wiki.pdftalk.de/doku.php?id=pdftalknonnamespacefileout [4] <https://wiki.pdftalk.de/doku.php?id=smalltalktransform> https://wiki.pdftalk.de/doku.php?id=smalltalktransform [5] <https://github.com/PortingPDFtalk> https://github.com/PortingPDFtalk [6] <https://wiki.pdftalk.de/doku.php?id=valuesportinglog> https://wiki.pdftalk.de/doku.php?id=valuesportinglog _______________________________________________ Esug-list mailing list -- <mailto:esug-list@lists.esug.org> esug-list(a)lists.esug.org To unsubscribe send an email to <mailto:esug-list-leave@lists.esug.org> esug-list-leave(a)lists.esug.org

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How can I use Pharo as an app development space (+ question about jobs)?
by lucasrodriguesoficial5＠gmail.com March 26, 2022

March 26, 2022

I'm starting my career as a systems designer and analyst, and for my first project I've decided to make an app/executable in Smalltalk with the bold goal of vanquishing bureaucracy in any public-person interactions which need paper documentation to go through, such as immigration, social programs, housing, or even legal matters. The idea is to find someone to implement it on a national scale somewhere, then spread to the world; or at least land myself a job overseas with the idea as a portfolio. Any kind of job would do, though a outsourcing/freelancing one would be the best. Problem is, Pharo doesn't have an effective framework for deployable desktop/phone applications, from what the users of its dedicated Discord server said. What toolkit, tutorial or assisting language (could I use to make standalone protoypes for enterprises? I already have the class behavior of the project done, the UI interaction is whatâs lacking. If there really isnât any, should I really start again with a brand new programming language and only use Pharo as a reference? What also concerns me not only in Pharo but in programming in general is how nothing ever seems to be enough to work for an enterprise, more so as an immigrant. My fear is that, even after the project is finished, I wonât be able to meet the requirements of anyone interested in hiring (my qualifications are a degree in Game Design and few months of an internship experience). People always say that the important thing is to solve problems regardless of whether you know one or many programming languages, but how can that be true when supposedly the most powerful OO language canât deploy a product? How are things everâ¦ done in the industry? What knowledge is a staple to anyone willing to work on Systems Design and Analysis field?

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UK Smalltalk User Group Meeting - Wednesday, March 30th
by Giovanni Corriga March 22, 2022

March 22, 2022

The next meeting of the UK Smalltalk User Group will be held on Wednesday, March 30th 2022. Come to hear news about Glamorous Toolkit, the moldable development environment. We were busy over the past year: beside everything else, GT also became a multi-language notebook + programmable knowledge management platform. By this we unify the flows of programming, data science and knowledge management. And there might be a couple of other surprises, too. Tudor GÃ®rba is a software environmentalist and CEO of feenk.com where he works with an amazing team to make the inside of systems explainable. Much of the work is embodied in Glamorous Toolkit (gtoolkit.com) a novel environment that enables Moldable Development. 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 to receive the meeting details. Donât forget to bring your laptop and drinks!

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Null Object Pattern
by sean＠clipperadams.com March 21, 2022

March 21, 2022

I had some chaining that was getting too complex due to many nil checks, so I started to refactor using a Null Object. However, Iâm struggling a bit with the refactor due to inlining. Since #ifNil: variants might be inlined, it seems that something like: anObject with a long chain of messages ifNotNil: \[ :result | ââ¦â \] must be changed into something like: anObject with a long chain of messages isNil ifFalse: \[ anObject with a long chain of messages ââ¦â \]. Obviously, I can use a temp to have: result := anObject with a long chain of messages. result isNil ifFalse: \[ result ââ¦â \]. But both seem ugly and make me question using this pattern. 1. What am I missing? 2. After 40+ years of Mooreâs Law, can we turn off these inlines by default?

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Positions at lifeware :)
by stephane ducasse March 21, 2022

March 21, 2022

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Another question about Spec2 and SpTablePresenter
by Mark O'Donoghue March 21, 2022

March 21, 2022

Howdy all I am making progress with quite a large application which relies heavily on Spec2 ( but Spec2 is such a big learning curve for me â especially given the incomplete documentationâ¦ ð) I am currently struggling with the following issue: I have a SpTablePresenter which shows a collection of domain objects (subclassed from Model). The domain object are instances of âAssetâ which is a relatively simple class. The table works fine. Now, I need to be able to update some columns , but I donât think I want to build a separate form for doing classic CRUD operations. (There is no need for create or delete functionality â so an in-situ update seems desirableâ¦). Iâve made a start using SpStringTableColumn >> beEditable and #onAcceptEdition: But I canât see how to work out what row and column has changed, and how I can update the corresponding Asset instance(s). It thought it would be handled using #whenModelChanged: but there are models in many places (and at several levels in the Spec hierarchy)â¦ Iâve tried following it all the way down to the adapters and morphs but I canât see how the freshly edited cell interacts with the model or announcements. (BTW - It doesnât look like the âselected itemâ features are appropriate since you can do edits in other rows regardless of what row is/isnât selected.) Is there a correct and/or elegant way to detect these cell changes in a SpTablePresenter and apply them to my domain objectsâ¦? Cheers Mark From: Mark O'Donoghue <mark.odonoghue.2010(a)gmail.com> Sent: Sunday, 4 July 2021 5:26 PM To: pharo-users(a)lists.pharo.org Subject: Question about Spec2 and SpTablePresenter Howdy all Iâve got stuck trying to manage Tables â over 12 hours now and Iâm out of ideas!. â¹ Any observations / suggestions are most welcomeâ¦ Iâve been loading small external files of transactions using NeoCSV into Spec2 tables. I am trying to use Fuel to persist the table contents so that my application will re-load the working state from where I finished in the last session. (Iâve opted for Fuel as a simple alternative to having to do the whole object relational mapping thing.) The idea is that transactions (and potentially some manual adjustments) will be processed over time. (This is preferable to having to reload all files from the beginning evert time I run the applicationâ¦) The Spec2 tables have been working well until I tried to persist them. I canât seem to fully re-load them to a previously saved state. For example - I can restore the essential contents of my table in most circumstances using: restoreObjects âfilePresenter1 is a SpTablePresenterâ | objects savedEntry | objects := CpPersist restoreObjectsFromFileNamed: 'E:\Me\zzzST-Test\demo.fuel'. recentFileList := objects at: 1. currFileFilter := objects at: 2. savedEntry := objects at: 3. self updateFilterButton: currFileFilter. filteredFileList := self filterFilesUsing: currFileFilter. filePresenter1 items: filteredFileList. savedEntry ifNotNil: [filePresenter1 selectItem: savedEntry ]. However, if any of the table columns are re-sorted , the re-load operation gets confused and I canât get the saved a saved selected item to become selected again. (It seems to be confusing the index numbers of the sorted and unsorted lists â even when I match by contents rather than index.) (I also created an equality test to ensure equivalent entries are recognised by the #= operation in the list of the underlying model ). This all works fine - unless I sort a column! Since this approach was going to be used on several screens Iâd really like to find a solution. Cheers Mark Perth, Western Australia

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[ANN] Stargate v7.1.1 [v7.1.1] released!
by Buenos Aires Smalltalk March 17, 2022

March 17, 2022

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ANN: Linux Open Build Service new versions
by Esteban Lorenzano March 17, 2022

March 17, 2022

Hi, I have been preparing our OBS builds [1] for the Pharo 10 release. We now include: Fedora 35 Ubuntu 21.10 Debian 11 And we fixed the rolling releases: Arch OpenSUSE Thumbleweed Enjoy! Esteban [1] https://software.opensuse.org//download.html?project=devel%3Alanguages%3Aph…

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Pharo VM Release - v9.0.13
by tesonep＠gmail.com March 17, 2022

March 17, 2022

Hello, I have released a new version of the Pharo VM for Pharo 9 and Pharo 10. This VM is accessible right now from Zero-Conf, updating it in the Pharo Launcher or using the usual downloads (as described in pharo.org/download) This version includes a series of bug fixes. Changelog: - Correct handling OOB (Out of Band Data) in Window - Blocking signals while signalling semaphores to avoid deadlocks caused by signal handlers - Make MAXHOSTNAMELEN at least 256: improving resolution of names in Linux - Improving VM Simulator Machine debugger - Integrating Processor Simulator for RISCV - Using a new SDL2 version built for OSX Mojave compatibility Thanks a lot, and any doubt please let me know. Cheers, Pablo on behalf of the whole Pharo team. -- Pablo Tesone. tesonep(a)gmail.com

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BlockClosure folding
by HernÃ¡n Morales Durand March 16, 2022

March 16, 2022

I think I saw a coding pattern a while ago that allows you to do the following: cond1 , cond2 , cond3 , cond4 And providing a kind of folding selector condition #and: you would get: [ cond1 and: [ cond2 and: [ cond3 and: [ cond4 ] ] ] ]. for example: conditions := [ : each | each firstName = 'Boca' ] , [ : each | each lastName = 'Baret' ] , [ : each | each fullName = 'Virgasia' ]. such that the following assert is met: self assert: conditions equals: [ : each | each firstName = 'Boca' and: [ each lastName = 'Baret' and: [ each fullName = 'Virgasia' ] ] ]. Any ideas or pointers? Cheers, HernÃ¡n

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pharo image and vm
by Otto Behrens March 14, 2022

March 14, 2022

Hi, I downloaded a new pharo from https://files.pharo.org/get-files/90/pharo64.zip https://files.pharo.org/get-files/90/pharo64-linux-stable.zip When I start up the image with the VM, I get "Your VM is too old for this image. Please download the latest VM" None of the shortcut keys seem to work. Something like <ctrl>-c does nothing. Does this have something to do with the incorrect VM? What am I missing here? Thanks for your help Otto Behrens +27 82 809 2375 [image: FINWorks] [image: FINWorks] <http://za.linkedin.com/in/waltherbehrens> www.finworks.biz Disclaimer & Confidentiality Note: This email is intended solely for the use of the individual or entity named above as it may contain information that is confidential and privileged. If you are not the intended recipient, be advised that any dissemination, distribution or copying of this email is strictly prohibited. FINWorks cannot be held liable by any person other than the addressee in respect of any opinions, conclusions, advice or other information contained in this email.

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[ANN] Camp Smalltalk Supreme's Speaker Line-up
by horrido.hobbies＠gmail.com March 14, 2022

March 14, 2022

Here it is: https://campsmalltalksupreme.wordpress.com/2020/06/28/daily-events/ Looks like a very strong event!

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Pharo with Style (new version) is now available as physical book
by stephane ducasse March 13, 2022

March 13, 2022

https://www.amazon.fr/Pharo-Style-StÃ©phane-Ducasse/dp/232218201X/ref=sr_1_…MÃÅ½ÃÃ&crid=15GN4OFOFHK56&keywords=Pharo+with+style&qid=1647113931&sprefix=pharo+with+style%2Caps%2C60&sr=8-1 <https://www.amazon.fr/Pharo-Style-St%C3%A9phane-Ducasse/dp/232218201X/ref=s…> https://www.decitre.fr/livre-pod/pharo-with-style-9782322182015.html <https://www.decitre.fr/livre-pod/pharo-with-style-9782322182015.html> https://www.bod.fr/librairie/pharo-with-style-stephane-ducasse-9782322182015 <https://www.bod.fr/librairie/pharo-with-style-stephane-ducasse-9782322182015> I will update the web site as soon as I get time. S

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Detecting keystrokes in Spec2 input fields
by Robert Briggs March 12, 2022

March 12, 2022

Hi Is there a simple way to detect when a use makes a keystroke in for example a Spec 2 Text Input Presenter? Iâve been going through all the relevant classes and methods, even into Morphic, but so far I have not found a way to do it. I want to be able to identify when unaccepted changes have been made to the displayed text to ensure that a use does not leave a form without saving any input made. Regards Robert

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SpDropListPresenter emptyList
by Robert Briggs March 5, 2022

March 5, 2022

I think this might be a bug. When I send emptyList to a non-empty SpDropListPresenter it reports âSubscriptOutOfBounds: 1â. I seems to be due to emptyList setting the list model to a new empty OrderedCollection and a later method trying to access the first item in the collection. Attached screen shot shows the debugger window. If it is a bug please report it and if possible advise a workaround. If not a bug please advise the correct way to clear Â or change the contents of a drop list. Many thanks Robert

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ByteString asDate
by Robert Briggs March 4, 2022

March 4, 2022

I may be being stupid but the current Date Class does not appear to protect itself against a ByteString that is not in valid date format, e.g. by raising an Error. e.g. the code Â âABCâ asDate opens the Debugger on #isLetter was sent to nil because it appears to expect more letters after $C but the peek returns nil instead. This seems to me to require a more defensive programming approach. I would like to validate a user input as a valid date in a number of different formats before converting it to a Date and storing it in my model. Iâve tried using the Date parser, e.g. Date readFrom: '04/02/2013' readStream pattern: 'dd/mm/yyyy'. This is fine for simply parsing a valid string but rates a DateError if it doesnât match the .Â So entering â04/13/2013â cleverly raises âDateError: There is no 13th monthâ. My thought was I could use this to return a simple true/false result in a ByteString extension in my application for example as follows: ByteString >> isValdiDate (Date readFrom: self pattern: âdd/mm/yyyyâ) on: DateError do: [^ false]. ^ true However this doesnât intercept the DateError which is simply reported in the Debugger as before.Â Â This may be my lack of uncderstaning of the Exception handling in Pharo. Any and all thoughts welcome. R

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The orange 'content modified' indicator
by Robert Briggs March 3, 2022

March 3, 2022

Hi Pharo browserâs show a little triangular orange triangle in the top right corner when code is edited by the user but not yet Accepted. Is there a mechanism for doing the same, e.g. in an editable SpTextPresenter? Iâve looked around related Spec2 Classes but unable to find a method to do this. Advice please. Regards R

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Dragging objects with restrictions
by Eduardo Ochs March 2, 2022

March 2, 2022

Hi people, I am a beginner with SmallTalks. At the moment I understand the basics about the language but very little about the graphical interface... Can you recommend me docs and tutorials on how to do something like this in Pharo? http://angg.twu.net/eev-videos/2022dragABC.mp4 The link above is to a video that is 20 seconds long. In the first 15 seconds (suggestion: ignore them!) I use weird Emacs tricks to draw three objects in a Tcl/Tk canvas - the letters A, B, and C - and to bind "mousebutton1 motion" to different actions in each of them... ...and in the last 5 seconds of the video I draw the letters A, B and C with the mouse to show what are these actions. In short: the letter A moves freely, the letter B moves in the same horizontal line as A, and when I drag C around it moves B horizontally to force B to be in the same horizontal line as C. Thanks in advance! =) Eduardo Ochs http://angg.twu.net/#eev

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How to unsubscribe?
by contactme＠kathe.in March 2, 2022

March 2, 2022

Hello, I tried issuing the "unsubscribe" and "help" commands to the mailing list management system but didn't get any response. May I know how to go about "unsubscribing" from this mailing list? Thank you. Â

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[PDFtalk] Porting to non-namespace Smalltalks
by christian.haider＠smalltalked-visuals.com March 1, 2022

March 1, 2022

Hi all, PDFtalk is a PDF library for VisualWorks[1]. The library has been ported successfully to Gemstone[2]. Now, there is interest from companies in a port to Squeak and VA Smalltalk. The project[3] has started and we are making good progress. The first step: porting the Values package. This is easy, because there are no namespace issues. The next step is to implement class renamings so that namespaced classes can be renamed to global prefixed names. Then PDFtalk with all its components, except for the UI, can be ported. The porting approach is different to the traditional way of loading and fixing. The import files for other Smalltalks are generated from VisualWorks where the code is transformed by declarative rules. The approach is documented in [4]. I set up a GitHub organization for this project[5]. There, the fileouts for each dialect are published (Gemstone, Squeak and VA Smalltalk so far), so that people without VisualWorks can work with the code in their Smalltalk. Also, I record and explain all steps of the porting process for Squeak in great detail[6], so that people can follow it. I would like to invite Smalltalkers from all dialects to take part in this project. The code transformations for Squeak will be quite similar to the ones needed for Pharo and Cuis. Therefore, each port to one Smalltalk will help the port to other Smalltalks. Any takers? Happy hacking, Christian [1] https://wiki.pdftalk.de/doku.php?id=start [2] https://wiki.pdftalk.de/doku.php?id=pdftalk4gemstone [3] https://wiki.pdftalk.de/doku.php?id=pdftalknonnamespacefileout [4] https://wiki.pdftalk.de/doku.php?id=smalltalktransform [5] https://github.com/PortingPDFtalk [6] https://wiki.pdftalk.de/doku.php?id=valuesportinglog

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