December 2019 - Pharo-users

can I write this without the three if then;s
by Roelof Wobben Dec. 27, 2019

Dec. 27, 2019

1 0

Namespaces (was Re: Behold Pharo: The Modern Smalltalk)
by Ben Coman Dec. 24, 2019

Dec. 24, 2019

On Thu, Oct 12, 2017 at 8:52 PM, Sean P. DeNigris <sean(a)clipperadams.com> wrote: > horrido wrote > > Having separate namespaces would be really good. > > VisualWorks has them. Why not Pharo? > > I can't remember ever hearing disagreement on this subject. It seems the > only questions have been: 1) how to do them *right*, The default position would be leveraging someone else's experience, so this begs the question, what is wrong in namespace implementations in VW, Gemstone, Squeak (as our immediate neighbours, then plus Dolphin, SmalltalkX, other languages) Are there been any research papers around comparing these? I found the "Pharo on Gemstone VM" talk impressive. The "develop on Pharo deploy on Gemstone" philosophy seems like a nice synergy for Pharo's commercial future. So a naive approach would be to do namespaces just like Gemstone. Maybe its not the best, but would it be "good enough" -- perfection being the enemy of done and all that jazz. cheers -ben > and 2) where they fall on the endless prioritized todo list >

13 24

High CPU use idling
by Esteban Maringolo Dec. 24, 2019

Dec. 24, 2019

I constantly find Pharo eating the CPU of the VM, from 25% on idle to 100%, which of course heats up any laptop. The Pharo Process monitor doesn't show anything unusual, but I cannot tell from that tool if some process is the culprit. How can I know what is eating the CPU? Is there a way to kill all the unnecessary process and respawn the needed ones? I run Pharo 7 within a VirtualBox VM with Lubuntu on a Windows 10 host. But the CPU issue happens only with Pharo. Regards, Image: Pharo-7.0.3+build.164.sha.591a635c8922e5f1cff1d0b3fbf2e525b590d25f (64 Bit) Vm: /lib/pharo/5.0-201901051900/pharo (downloaded by PharoLauncher) Esteban A. Maringolo

1 1

NeoCSV with numerous fields
by Hilaire Dec. 23, 2019

Dec. 23, 2019

Hi, I have float number datas coming with 60, 600 and 6000 rows. Is there a convenient way to let NeoCSV load and convert to array of floats. So far, I am doing it by "hand" with stream? Thanks Hilaire -- Dr. Geo http://drgeo.eu

4 7

I feel like an overwhelmed maintenance programmer - how to get some toeholds?
by Steve Davies Dec. 22, 2019

Dec. 22, 2019

Hi, I'm having yet another go to get to grips with Pharo. My project is for home automation. It seems in principle a great match since object inside Smalltalk are obviously a great match for physical objects being controlled. I started at the Pharo Wiki on Github "Setting up a new project". I'm a career programmer but I'm nearly 60 and sadly I can't absorb information like I used to be able to, and I'm just finding Pharo so overwhelming - I feel like a maintenance programmer trying to find a way into a million lines of code when you don't understand the principles of organisation and the conventions of the developers. Is there no way to have some sort of "progressive revelation" of the insides of Pharo? Just documentation on most classes, examples of how to use the class, without the implementation being exposed initially? The stuff I need to look into for my project is mixed in with 1000s of classes that I (hopefully) can ignore for now - but there seems to be no way to hide away all the irrelevant stuff. Traditionally if I was trying to get to grips with a large unfamiliar code base I would use grep to search, skim through source files getting a sense of it. With the browser in Pharo I feel like I'm looking through a keyhole. No doubt this is just unfamiliarity and I just need to learn the tools better. Please read this as a request for help as to how to get a finger hold and how to shake this feeling of drinking from the firehose? It's not intended as a complaint. My first task is to write an MQTTClient. MQTT is a messaging protocol. MQTT has "clients" - who subscribe for "topics" and receive matching messages, and which can publish to topics. And there are brokers which distribute published messages to subscribing clients. I only need to implement a client. The protocol is binary, not text. It runs over TCP. Here's a description of the messaging SInce I envision objects inside Pharo that model the real external objects then I will need some sort of background process running the connection to the mqtt broker, and each object would receive and send MQTT messages via that process. So to tackle this I need to understand: 1. How to implement a TCP client (subclass ProtocolClient? Or do I need to work at a lower level with SocketStream?) 2. Packing and unpacking binary data, working with bits. 3. How to talk to and from a background process. Any and all suggestions and help to get going would be welcome. I do understand the principles of Smalltalk and can read code OK. Thanks, Steve

10 22

Teapot load error - ZdcPluginMissing
by BrunoBB Dec. 22, 2019

Dec. 22, 2019

Because of this: http://forum.world.st/External-Module-not-found-LGitLibrary-td5108496.html i'm trying to create a new image but i got a new error when loading Teapot: "ZdcPluginMissing: SSL/TLS plugin initailization failed (VM plugin missing ? OS libraries missing ?) " [ :exception | "Give a more human friendly error message" ZdcPluginMissing signal ] in ZdcPluginSSLSession>>initialize in Block: [ :exception | "Give a more human friendly error m...etc... BlockClosure>>cull: Context>>evaluateSignal: Context>>handleSignal: PrimitiveFailed(Exception)>>signal PrimitiveFailed class(SelectorException class)>>signalFor: ZdcPluginSSLSession(ProtoObject)>>primitiveFailed: ZdcPluginSSLSession(ProtoObject)>>primitiveFailed ZdcPluginSSLSession>>primitiveSSLCreate [ handle := self primitiveSSLCreate ] in ZdcPluginSSLSession>>initialize in Block: [ handle := self primitiveSSLCreate ] BlockClosure>>on:do: ZdcPluginSSLSession>>initialize ZdcPluginSSLSession class(Behavior)>>new ZdcSecureSocketStream>>sslSession ZnClient>>setupTLSTo: ZnClient>>newConnectionTo: ZnClient>>getConnectionAndExecute ZnClient>>executeWithRedirectsRemaining: [ self executeWithRedirectsRemaining: self maxNumberOfRedirects ] in ZnClient>>executeWithRetriesRemaining: in Block: [ self executeWithRedirectsRemaining: self maxNumb...etc... BlockClosure>>on:do: ZnClient>>executeWithRetriesRemaining: [ self executeWithRetriesRemaining: self numberOfRetries ] in [ [ self executeWithRetriesRemaining: self numberOfRetries ] on: Error do: self ifFailBlock ] in ZnClient>>executeWithTimeout in Block: [ self executeWithRetriesRemaining: self numberOfR...etc... BlockClosure>>on:do: [ [ self executeWithRetriesRemaining: self numberOfRetries ] on: Error do: self ifFailBlock ] in ZnClient>>executeWithTimeout in Block: [ [ self executeWithRetriesRemaining: self numberO...etc... [ ^ block value ] in ZnClient>>withTimeoutDo: in Block: [ ^ block value ] [ activeProcess psValueAt: index put: anObject. aBlock value ] in ZnConnectionTimeout(DynamicVariable)>>value:during: in Block: [ activeProcess psValueAt: index put: anObject.... BlockClosure>>ensure: ZnConnectionTimeout(DynamicVariable)>>value:during: ZnConnectionTimeout class(DynamicVariable class)>>value:during: ZnClient>>withTimeoutDo: -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

1 1

External Module not found - LGitLibrary
by BrunoBB Dec. 22, 2019

Dec. 22, 2019

Hi, Using Pharo on Windows time to time i got "External Module not found" for LGitLibrary. Not sure if i'm hitting: https://github.com/pharo-project/pharo-launcher/issues/307 But this time the problem is not fixed. Other time after some trying to open the image in different way (PharoLaucher, from CommandLine, selecting Pharo.exe to open .image files, ..) the problem fixed itself. ExternalLibraryFunction(Object)>>error: ExternalLibraryFunction(Object)>>externalCallFailed ExternalLibraryFunction(ExternalFunction)>>invokeWithArguments: LGitLibrary>>libgit2_init FFICalloutAPI>>function:module: LGitLibrary(Object)>>ffiCall: LGitLibrary>>libgit2_init [ self libgit2_init. self recordInitializationSuccess ] in LGitLibrary>>initializeLibGit2 in Block: [ self libgit2_init.... BlockClosure>>on:do: LGitLibrary>>initializeLibGit2 LGitLibrary class>>startUp: ClassSessionHandler>>startup: [ :each | each startup: isImageStarting ] in WorkingSession>>runStartup: in Block: [ :each | each startup: isImageStarting ] [ aBlock value: each ] in [ :each | [ aBlock value: each ] on: Exception do: [ :error | self errorHandler handleError: error ] ] in WorkingSession>>runList:do: in Block: [ aBlock value: each ] BlockClosure>>on:do: [ :each | [ aBlock value: each ] on: Exception do: [ :error | self errorHandler handleError: error ] ] in WorkingSession>>runList:do: in Block: [ :each | ... Array(SequenceableCollection)>>do: WorkingSession>>runList:do: WorkingSession>>runStartup: WorkingSession>>start: SessionManager>>launchSnapshot:andQuit: [ isImageStarting := self launchSnapshot: save andQuit: quit. wait signal ] in SessionManager>>snapshot:andQuit: in Block: [ isImageStarting := self launchSnapshot: save and...etc... [ self value. Processor terminateActive ] in BlockClosure>>newProcess in Block: [ self value.... -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

3 7

fileout ** ERROR! THIS SCRIPT IS MISSING **
by PAUL DEBRUICKER Dec. 20, 2019

Dec. 20, 2019

This is in Pharo 7 In a package I have a class that has methods that I can see in a browser. When I save it to an mcz file the class isn't saved in the file for the package. When I file out the class and file it back in there is a load error. The fileout has many of these errors scriptMarkerFor:withLabel:on: ** ERROR! THIS SCRIPT IS MISSING ** renderNameAndAddressFor:on: ** ERROR! THIS SCRIPT IS MISSING ** Those methods are defined in the image and in the class's super class. I cannot change the class's package because I get method dict lookup errors. Making a copy of the class fixes everything for the copied class. Is there a way to scan my package for other classes that are broken like this one was? Thanks Paul

1 0

[ANN] Pharo Newsletter December 2019
by Marcus Denker Dec. 20, 2019

Dec. 20, 2019

The December newsletter is now online: https://mailchi.mp/pharo/pharo-newsletter-december-2019 If you have content for the next newsletter -> send me a mail. It starts to get *really* difficult to not forget something. Marcus

1 0

Techtalk December recording online
by Marcus Denker Dec. 20, 2019

Dec. 20, 2019

"Working with Spec2 and GTK" Recording: https://www.youtube.com/watch?v=IVY7TH4MCXI There is a playlist for all techtalk recordings here: https://www.youtube.com/playlist?list=PL4actYd6bfnx8l8cqYWhdNB6gJgRvk5sH

1 0