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Tree API blog post
by Smiljana Knezev July 19, 2019

July 19, 2019

Hello everyone, Next week I'm consulting with mentors on how to design an API for Tree data structures. I was researching a bit and wrote this blog post as a starting point: https://pharokeepers.github.io/pharo/2019/06/30/Application-Programming-Int… Feedback and ideas are more than welcome :) Best regards, Smiljana Knezev

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"whenSelectedItemChanged:" in Spec
by Steve Quezadas July 17, 2019

July 17, 2019

I am running through the "Spec UI Framework" tutorial, and in it has a widget class inherited from "ComposablePresenter" (ComposablePresenter subclass: #WidgetClassList). But for some reason the "whenSelectedItemChanged:" method call does not execute when I select any item on the GUI list. Is there anything I'm missing? I posted this earlier on the list, and someone suggested I try "whenActivatedDo:" or "whenSelectionChangedDo:", but it doesn't do anything as well. The code looks like this: whenSelectedItemChanged: aBlock Transcript show: 'should get here; cr. I am using Pharo 7. - Steve

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Re: [Pharo-users] [ANN] GitBridge
by Cyril Ferlicot July 17, 2019

July 17, 2019

On Wed, Jul 17, 2019 at 4:59 PM Alexandre Bergel via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > Thanks Cyril, > > This look awesome. A quick question: to access external resources, I usually use the expression (that you provide me some times ago) > > repo := (IceRepository registry detect: [ :each | each includesPackageNamed: 'GeneticAlgorithm' ] ifNone: [ self error: 'Please add a clone of this project to Iceberg to access to the resources' ]) location. > > In this case, I can use some resources located in the git repository of the GeneticAlgorithm project. Eg. repo / âmy image.pngâ > > What does GitBridge bring more than that? I feel I miss something obvious... > Well, it is mostly that. If you check the implementation it uses the same kind of expression. What it bring more is to factorise the code to do it (Like this if Iceberg change I just need to update GitBridge and all projects using it will be fixed). It also brings methods such as #version that can be useful and I hope we will add useful things to it to avoid everyone duplicating their own version in their project. Last thing is that the API is clear. For example you can just do: `GABridge images` instead of the whole detect on the Iceberg registry. > Cheers, > Alexandre > > > -- Cyril Ferlicot https://ferlicot.fr

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[ANN] TinyLogger
by Cyril Ferlicot D. July 17, 2019

July 17, 2019

Hi, Some time ago I released the first stable version of a project of mine: TinyLogger. I announced it on Twitter but I forgot to announce it here :) I started this project because at some point I had an urgent need of a simple logger and at that time beacon was broken. :( I had no time to check from where the error came from and wait for the integration of a PR so I did a simple logger directly in my project. After some month/years I took some time to extract it to its own project and document it to give an alternative logger for simple cases. You can find information, a quick start and documentation here: https://github.com/jecisc/TinyLogger -- Cyril Ferlicot https://ferlicot.fr

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[ANN] GitBridge
by Cyril Ferlicot D. July 17, 2019

July 17, 2019

Hi! Today I released the v1 of a project I wanted to do since a long time: GitBridge. The goal of the project is to easily access external resources stored in the git repository of the project and other information. For more infos check the Quick start or documentation present at: https://github.com/jecisc/GitBridge When Monticello was the most common VCS usable with Pharo we stored a lot of external resources in the image. Now we are able to store them outside, get a lighter image and make it easier to edit and version them! This can be useful to store test resources, CSS/JS files for web applications, documentation, etc. This can also be useful to get from the application some information such as the current version of the application instead of hard-coding it in a method to update at each release. It implementation relies on Iceberg and the repositories registered in it. -- Cyril Ferlicot https://ferlicot.fr

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Question about Artifact and Especial Characters
by Juan Pablo Sandoval Alcocer July 17, 2019

July 17, 2019

Hi, We are using Artifact for automatically creating pdf invoices. It was working well so far, until we realize a problem with especial characters, for instance "ZariÄ". When some special characters are used, our script generate a white pdf as invoice :(. We tried to fix this using different char encodings for instance: UTF8 or Latin1. But then the special character is showed differently. [image: image.png] - Does anyone had this problem before? - Any idea of how may we address this? Thanks, Juan p.

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ESUG19: Camp Smalltalk 24/25 August
by Marcus Denker July 17, 2019

July 17, 2019

As usual at ESUG, we will be holding an informal âCamp Smalltalkâ the weekend before the conference. The idea is to meet, hack, discuss. - location: ZWEIDENKER, Luxemburger Str. 72, 50674 KÃ¶ln (see https://zweidenker.de/kontakt/ <https://zweidenker.de/kontakt/> ) - dates & times: - Saturday, 24.8.2019 from 11:00 AM to 6:00 PM - Sunday, 25.8.2019 from 11:00 AM to 6:00 PM To have and idea who is coming, please fill out this doodle https://doodle.com/poll/ffkt7rqm4sfi62df <https://doodle.com/poll/ffkt7rqm4sfi62df> (just select when you will attend). FYI: Gamescom takes place in Cologne from 21.-24. August 2019. Cologne will be crowded and Hotels are expensive until the 24th.

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(no subject)
by EVELYN CUSI LOPEZ July 15, 2019

July 15, 2019

Hi all, I'm working with artifacts, but I got an error. I have a pdf's generator which works very well, but recently I discovered that it has problems with special characters, specifically this: "Ä" since if some text has this symbol the pdf is generated in white, I tried some encodings to the text between them UTF8, Latin1, Latin2 and with these encodings the pdf manages to generate well; however the character does not look like it should look (It can be appear like this Ã or Ã¦). Does anyone know how to solve this problem? Thanks very much, Evelyn

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[ANN] Pharo Newsletter June 2019
by Marcus Denker July 15, 2019

July 15, 2019

The Pharo Newsletter for June 2019 was send to subscribers. It is now available online: https://mailchi.mp/pharo/pharo-newsletter-june-2019 Find all the older newsletters in the archive: http://newsletter.pharo.org. You can subscribe to get the newsletter to get it as soon as is released. The July newsletter will be out soon (this week) Marcus

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Re: [Pharo-users] [GSoC blog post] Binary Search Trees
by Richard O'Keefe July 15, 2019

July 15, 2019

Search trees (which come in many varieties) are good for collections in which adding, deleting, and lookup are interleaved, where there is an order on the elements (if used as a set) or the keys (if used as a dictionary). So are hash tables. But (balanced) search trees have guaranteed O(lg n) worst case time, which hash tables do not. And search trees let you enumerate their contents in ascending or descending order, at any time. And search trees can support queries like - tell me all the elements {<, <=, >, >=} x - tell me all the elements between L and U - tell me the next element (before,after) x My Smalltalk library includes Sorted{Set,Bag,Dictionary} implemented as splay trees. Some time I must try an alternative. in time O(lg n + number of answers). On Thu, 11 Jul 2019 at 04:53, Alexandre Bergel via Pharo-users < pharo-users(a)lists.pharo.org> wrote: > Hello Smiljana, > > Thanks for having written down this document. I am not expert in > algorithm, so I would consider myself a simple user. I have developed > complex software for some times and I have never seen the need of having a > binary search tree. I guess this is probably partly because of my lack of > expertise in binary search tree and partly because experts in binary search > trees assume that people know what it is about and in what it is useful. > > My question is, when should a programmer ever need to use binary search > tree? Can you add some examples on what these trees are good for, and how > an average programmer should look into it. I think this will be a valuable > and easy way to expand your blog. > > Cheers, > Alexandre > > On Jul 7, 2019, at 5:12 PM, Smiljana Knezev <smilja.knezev(a)gmail.com> > wrote: > > Dear all, > > I've written about implementing binary search trees: > https://pharokeepers.github.io/pharo/2019/07/07/SmiljanaBinarySearchTreeinP… > > Feedback and opinions is always welcome :) > > Best regards, > Smiljana Knezev > > >

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