July 2016 - Pharo-users - lists.pharo.org

Issue with Ulysse?
by Alexandre Bergel July 31, 2016

July 31, 2016

Hi! It looks like Ulysse is not working properly. Here is the report he/it entered for case 18846 https://pharo.fogbugz.com/f/cases/18846 Assigned to Everyone by Ulysse The Galactic Monkey From Outer Space 07/29/2016 (Yesterday) 2:23 PM Status changed from 'Resolved (Monkey is checking)' to 'Work Needed'. Issue Validation Failed: https://ci.inria.fr/pharo/job/Pharo-6.0-Issue-Validator/6957//artifact/vali… Errors: 1 | I click on the link, https://ci.inria.fr/pharo/job/Pharo-6.0-Issue-Validator/6957//artifact/vali… And it says absolutely nothing. So, what should I do to make Ulysse happy? Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

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magritteXML fixes
by Sean Glazier July 30, 2016

July 30, 2016

Hi, I tried to publish fixes to the Magritte XML package and the Smalltalk hub is not working. I published off to our own repository. I there an ETA on its getting fixed or an alternative repository to publish to? Kind Regards, Sean Glazier

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Programmatic generation of new class
by Brad Selfridge July 30, 2016

July 30, 2016

I'm trying to programmatically generate a new class, but am getting the following error: DynamicDescriptorSystem class(Object)>>doesNotUnderstand: #subclass:instanceVariableNames:classVariableNames:package: This is the method that I'm trying to execute: buildNewDescriptorSystemUsing: aDescriptorSystemClassName descriptorSystem := DynamicDescriptorSystem subclass: aDescriptorSystemClassName asSymbol instanceVariableNames: '' classVariableNames: '' package: packageName asString I see examples of this all over Pharo and I copied this code almost verbatim. What am I doing wrong? ----- Brad Selfridge -- View this message in context: http://forum.world.st/Programmatic-generation-of-new-class-tp4908659.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

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[ANN] Bugfixes for Metacello github .zip issues
by Dale Henrichs July 29, 2016

July 29, 2016

For additional details see the pull request[4]. Bugfixes 1. Issue #405[1] <https://github.com/dalehenrich/metacello-work/issues/405>: Github .zip download not downloaded to |/tmp| as expected ... Pharo-5.0 (& 6.0) 2. Issue #406[2] <https://github.com/dalehenrich/metacello-work/issues/406>: Github .zip download file should be deleted after archive is extracted Update baseline to reference |pharo6.0_dev| branch of Filetree for Pharo6.0[3] <https://github.com/dalehenrich/metacello-work/commit/6b810849235d6ac5e5bd55…> Dale [1] https://github.com/dalehenrich/metacello-work/issues/405 [2] https://github.com/dalehenrich/metacello-work/issues/406 [3] https://github.com/dalehenrich/metacello-work/commit/6b810849235d6ac5e5bd55… [4] https://github.com/dalehenrich/metacello-work/pull/408

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Re: [Pharo-users] OpenGLES2 binding available!
by Thibault Raffaillac July 29, 2016

July 29, 2016

+1 for your analysis! > One of the biggest issue of OpenGL is related with vsync, which is an operation that can block all of the Pharo processes. It does indeed, but is one way to sync with display rate (until we get threaded FFI of course then a thread can handle the wait). Currently we have to way to know the ideal time to start redraw, so as to minimise the delay between processing an event and displaying its feedback. Standard way is redraw with fixed independent frequency, which incurs an average feedback delay of (display period+redraw period)/2, and a waste of processing time if faster than display rate. VSync in video games has a bad press because people redraw right after it returns: _ Process events _ Draw scene _ Swap buffers <- pauses until scene is displayed _ Loop back That gives a worse feedback delay, but we could to pause a bit before processing stuff: _ Delay(display period - last redraw duration - redraw jitter) _ Process events _ Draw scene _ Swap buffers _ Loop back I find it very hard to find good info on VSync, and low latency event handling on PC in general, so please don't pan this idea too hard, this is just for experiment fun :) > A far worse problem with OpenGL is that the current OpenGL context is a > thread local variable, which do not interact at all with Pharo processes. > This is the reason of why I added the OSWindowRenderThread class for > serializing OSWindow and OpenGL animations. SDL2 renderers are usually > implemented using OpenGL. They are two correct solution for this problem: > - Having a VM that maps each Pharo Process into an operating system thread, > - Not using OpenGL at all. > > The others low level graphics API (Vulkan, Direct 3D and Metal) do not rely > on a global thread local storage variable. These APIs are object oriented, > so handles are passed in each API call. Yes, this is a major flaw in OpenGL. A GL context is global to all Pharo processes, meaning one Process could draw in an other Process area if preempted at the wrong moment. But a simple way to circumvent this is giving all display Processes (using OpenGL) the same priority. > Anyway, implementing a Athens backend from scratch is a really hard problem. Agreed. The difficulty with a hardware backend for Athens is it comes from software world. Some primitives are a nightmare to accelerate, resulting in usually incomplete hardware backends (https://developer.android.com/guide/topics/graphics/hardware-accel.html#uns…) This is annoying for users because some primitives may turn off acceleration entirely, and force you to dig into the internal GL mud. To me the use of hardware drawing is either explicit or none. If appended to Athens it should be very clear what goes to the GPU and what not.

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switching to metadata-less gitfiletree
by Peter Uhnak July 29, 2016

July 29, 2016

Hi, I've followed this thread http://forum.world.st/How-do-I-convert-a-FileTree-project-to-Metadataless-G… to switch to metadata less format, Specifically: 1. change `.filetree` file, 2. load the repo to a clean image 3. make a change to each package and commit it This worked correctly, however having to recommit each package is annoying if there are several. My question is: * is it safe to directly remove the incriminating files (all monticello.meta/version & methodProperties.json files), * is it possible to mass-commit all packages with simple script, * or should I just ignore the metadata and eventually someone will make a change to the package so the metadata silently disappears? Thanks, Peter

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"self problem" with Ghost (virus)
by Steven Costiou July 29, 2016

July 29, 2016

Hi, I use virus from Ghost to intercept messages sent to a given object and adapt methods behaviors for this particular object only. However it would seems that doing interception this way is subject to the "self problem" described in this paper from StÃ©phane (DUCASSE, StÃ©phane. Evaluating message passing control techniques in Smalltalk. _JOURNAL OF OBJECT ORIENTED PROGRAMMING_, 1999, vol. 12, p. 39-50). I understand i could do instance based adaptation using an other technique, but i wonder if there is any way with Ghost to deal with this "self problem" problem ? Steven.

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Emojis in Pharo
by Sean P. DeNigris July 29, 2016

July 29, 2016

Are there any available fonts which correctly display emojis? I'm playing with sms data... ----- Cheers, Sean -- View this message in context: http://forum.world.st/Emojis-in-Pharo-tp4908461.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

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XMLParser Claims U+00A0 is âInvalid UTF-8â
by Sean P. DeNigris July 28, 2016

July 28, 2016

Posted to StackOverflow (https://stackoverflow.com/questions/38645553/xmlparser-in-pharo-claims-u00a…) Given the input: <?xml version='1.0' encoding='UTF-8' standalone='yes' ?> <sms body=". what" /> Where the character after the "." in the body attribute of the sms tag is U+00A0; I get the error: XMLEncodingException: Invalid UTF-8 character encoding (line 2) (column 13) IIUC, the UTF-8 representation of that character is 0xC2 0xA0 per Wikipedia. Sure enough, bytes 72 and 73 of the input are 194 and 160 respectively. This seems like a bug in XMLParser, or am I missing something? ----- Cheers, Sean -- View this message in context: http://forum.world.st/XMLParser-Claims-U-00A0-is-Invalid-UTF-8-tp4908525.ht… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

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Listing Named Play Pages
by Sean P. DeNigris July 28, 2016

July 28, 2016

Is there another way besides via Spotter? I would expect to find a menu or button on the playground itself... ----- Cheers, Sean -- View this message in context: http://forum.world.st/Listing-Named-Play-Pages-tp4908505.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

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