April 2020 - Pharo-users - lists.pharo.org

Migrating your projects to GitHub? Do not forget to tag your project!
by Esteban Lorenzano April 14, 2020

April 14, 2020

Hello, Just a gentle reminder to tag your project as âPharoâ, so a search engine can find it better! Esteban

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[ANN] QRCode on github
by Renaud de Villemeur April 13, 2020

April 13, 2020

Need to generate a QRCode ? An old (but still relevant) project was available on smalltalkhub. As I wasn't aware if it was already available elsewhere, I moved it to Github, including load instruction: https://github.com/rvillemeur/QRCode Unit test are all green on Linux. Have fun. Renaud

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Moving/rolling average implementations ?
by CÃ©drick BÃ©ler April 13, 2020

April 13, 2020

Hi, I wanted to do a moving/rolling average on raw data [1]. I havenât find code for that (maybe this is done in polymath though). So I ended writing that (I thing this is SMA): SequenceableCollection>>movingAverage: anOrder "Answer the moving or rolling average for anOrder window" | retval size x y | anOrder <= 0 ifTrue: [ Error signal: 'the order must be positive']. size := self size - anOrder. size negative ifTrue: [ Error signal: 'the collection size is too small']. retval := self species ofSize: size + 1. x := 1. y := anOrder. [y <= self size ] whileTrue: [ retval at: x put: (self copyFrom: x to: y) average x := x + 1. y := y + 1 ]. ^retval Not perfect but seems to works quite well (thatâs probably better to remove copyFrom: and use some kind of buffer instead). Any interest in that ? If any existing code too, Iâll be interested especially for other implementation (weighted, exponential) ? (#(118 113 105 105 103 99 98 101 100 107) movingAverage: 3) collect: [:v | v asScaledDecimal: 1 ] . "an Array(112.0s1 107.7s1 104.3s1 102.3s1 100.0s1 99.3s1 99.7s1 102.7s1)" Cheers, CÃ©drick [1] https://www.meilleursbrokers.com/techniques-de-trading/moyennes-mobiles.html <https://www.meilleursbrokers.com/techniques-de-trading/moyennes-mobiles.html> (in French but is understandable)

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Pharo 8: What is the VM doing when I am doing nothing?
by PBKResearch April 11, 2020

April 11, 2020

Hello. I have noticed a curiosity when I am running Pharo 8 on Windows 10. I am in the habit of leaving the Task Manager open when I am working, and it seems that Pharo 8 is using the CPU when I am doing nothing. When the image - which is exactly as first loaded, with only the welcome window visible - is loaded, CPU consumption is zero. I open a playground, get a list of recent files from the playground cache, open one of the files but do nothing with it; the CPU activity is constantly changing within the range 2.5% - 3.5%. After 5 mins of no Pharo activity by me, the CPU is still in the same range. I reloaded an earlier image, which is Moose Suite 6.1 (Pharo 6) and opened a playground in the same way. After a few seconds, the CPU usage dropped to zero. This activity is a feature of the newest versions only. It's obviously not a major problem, but I would like to know, if just out of curiosity. Thanks for any help. Peter Kenny My Pharo 8 details: Build information: Pharo-8.0.0+build.1124.sha.0932da82f08175e906b0e2a8052120c823374e9f (32 Bit) Installed from Pharo Launcher on 8 Apr 2020 VM details: CoInterpreter * VMMaker-CompatibleUserName.1577968628 uuid: d729bf66-2ea7-5a6d-b1eb-fc005785636d Jan 3 2020 StackToRegisterMappingCogit * VMMaker-CompatibleUserName.1577968628 uuid: d729bf66-2ea7-5a6d-b1eb-fc005785636d Jan 3 2020 VM: 201911290039-dev-7 admin@MacBook-Pro-de-admin.local:dev/Pharo/git-repos/pharo-vm/repo Date: Thu Nov 28 21:39:57 2019 CommitHash: 9b6bd16d3 Plugins: 201911290039-dev-7 admin@MacBook-Pro-de-admin.local:dev/Pharo/git-repos/pharo-vm/repo <mailto:admin@MacBook-Pro-de-admin.local:dev/Pharo/git-repos/pharo-vm/repo>

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Using the compiler for scripts / logging statistics (learning)
by CÃ©drick BÃ©ler April 11, 2020

April 11, 2020

Hi, Iâm playing with compiler with scripts. For instance: result := OpalCompiler new source: â3 + 1'; evaluate. result2 := OpalCompiler new source: 'self + 1'; receiver: 3; evaluate. I would eventually (as an exercice) try to log the time before and after the execution of the script. Its possible to send #logged: true; to the compiler which basically is able to log doIt through SystemPresenter. logDoIt self compilationContext logged ifFalse: [ ^self ]. Smalltalk globals at: #SystemAnnouncer ifPresent: [ :sysAnn | sysAnn uniqueInstance evaluated: source contents context: context ]. Right now, it seems the logging mechanism is launched once the evaluation is done. So my question is would it be possible to log start and ent time execution through the compiler. OpalCompiler>>evaluate "Compiles the sourceStream into a parse tree, then generates code into a method. If aContext is not nil, the text can refer to temporaries in that context (the Debugger uses this). If aRequestor is not nil, then it will receive a notify:at: message before the attempt to evaluate is aborted. Finally, the compiled method is invoked from here via withArgs:executeMethod:, hence the system no longer creates Doit method litter on errors." | value | self noPattern: true. self getSourceFromRequestorSelection. self class: (context ifNil: [ receiver class ] ifNotNil: [ context method methodClass ]). => here a kind of sell startLog. "code execution" value := receiver withArgs: (context ifNil: [ #() ] ifNotNil: [ {context} ]) executeMethod: self compile. "actual log callâ¦. Only for doIt ?" self logDoIt. ^ value I wonder what would be the way of doing it ? Is it only for doIts ? Start/endLog could be calling log options #(logDoIt, logWhatever, â¦) ? Maybe doing ScriptEvaluated to differ from ExpressionEvaluated would be the solution ? I imagine this has impact on performance too... My toy objective is to log statistic of scripts usage. Again this is just experiments, so happy to hear and learn from others. How would people do ? Cheers, CÃ©drick

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Status of Marea?
by HernÃ¡n Morales Durand April 10, 2020

April 10, 2020

Hi everyone, Just checking what it would take to update Marea for a production environment in Pharo 8 or Pharo 9 or beyond. The last repo link I found is this: http://ss3.gemstone.com/ss/Marea.html And I couldn't find other codebase in the Mariano's Github repo. Any updates out there? Cheers, HernÃ¡n

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Pharo on a chromebook?
by PAUL DEBRUICKER April 10, 2020

April 10, 2020

Forgive my ignorance but does anyone have a recipe to run Pharo on a Chromebook? Without having to install another OS. And also not with SqueakJS. Just on ChromeOS? Seems like its not possible. Just wanted to double check. thanks Paul

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Automation of MS Office from Pharo
by PBKResearch April 9, 2020

April 9, 2020

Hello All I am using Pharo (currently P7, moving to P8) under Windows 10. I have MS Office 365 on my system, and use it regularly for non-Smalltalk tasks. It would be very convenient if I could issue commands to MS Office components from within Pharo. My current interest is to manage my incoming e-mails in Outlook, but I can see many other applications. I have a recollection of seeing a reference to automation of Excel to transfer data both ways, but I cannot recall where. I have searched the catalog, but could not see anything that looked relevant. I have also read the uFFI booklet, but again no luck. Could anyone point me to any information or examples of such control, please? It would not have to be Outlook, though that is my main interest; given examples for other Office components, I should be able to follow the pattern. TIA Peter Kenny

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Re: [Pharo-users] Can't able to understand the code
by shawon58 April 8, 2020

April 8, 2020

actually i am just exploring UFFI from the pdf "Calling Foreign Functions with Pharo" there one section is for external objects so i cant understand that code what i attach as screenshot above. can u able to explain what actually happen here ?? -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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April 8, 2020

Just a try. I searched for free picture around the words lighthouse and/or (mosaic patchwork painterâ¦). A bit like this one (which is not free). Also, I kind of like the spiral effect which evoke practicing the internalâ¦ and the spiral effet (learning/getting better). https://www.flickr.com/photos/28752865@N08/19369475232 <https://www.flickr.com/photos/28752865@N08/19369475232> There are some other free and available. This one is Creative Commons: https://www.flickr.com/photos/kaptainkobold/6699472801 <https://www.flickr.com/photos/kaptainkobold/6699472801> => google image searches <https://www.google.com/search?q=lighthouse+inside+stairs&tbm=isch&ved=2ahUK…> on Â« free Â» internal stairs. I also searched for Â« lighthouse anatomy / internals Â». Itâs nice but donât think usable out of the box. It should be stylized (and eventually adapted to programming internals). https://commons.wikimedia.org/wiki/File:Antique_-_Maniguin_Lighthouse_-_Ori… <https://commons.wikimedia.org/wiki/File:Antique_-_Maniguin_Lighthouse_-_Ori…>. Section_of_new_Eddystone_Lighthouse.jpg <https://upload.wikimedia.org/wikipedia/commons/7/74/Section_of_new_Eddyston…>. My 2 cents, CÃ©drick (preference for the spiral effect)

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