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Archive Page for Pharo TechTalks
by Marcus Denker March 9, 2017

March 9, 2017

Hi, I added http://pharo.org/TechTalk <http://pharo.org/TechTalk> This is linked from http://pharo.org/community <http://pharo.org/community> The idea is to keep a log of all past tech talks with links to the archival recording (if there is one). Marcus

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Callback regression in Pharo 6 (60437)
by Aliaksei Syrel March 9, 2017

March 9, 2017

Callback instantiation: createCallback > ^ FFICallback > signature: #(long (long)) > block: [ :value | value ] C functions: long test(long(*function)(long), long value) { > return function(value); } #include <limits.h> > > long long_min() { > return LONG_MIN; > } FFI calls: primCall: aCallback long: aNumber > ^ self ffiCall: #(long test(FFICallback aCallback, long aNumber)) > primLongMin > ^ self ffiCall: #(long long_min()) Test case: test > self > assert: (self primCall: self createCallback long: self primLongMin) equals: self primLongMin self primLongMin returns -2147483648 (= LONG_MIN). Result of callback is 0 => test fails. P.S. works in Pharo 5 Cheers, Alex

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Need to login to access pharo-dev ci
by Yuriy Tymchuk March 9, 2017

March 9, 2017

HI, when I go to https://ci.inria.fr/pharo-contribution/ <https://ci.inria.fr/pharo-contribution/> I end up on a page asking me to login. Shouldnât it be possible to see the jobs without logging in? Uko

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Esteban's ChangeLog week of 27 February 2017
by estebanlm＠gmail.com March 9, 2017

March 9, 2017

Hello! This is my weekly ChangeLog, from 27 February 2017 to 5 March 2017. You can see it in a better format by going here: http://log.smallworks.eu/web/search?from=27/2/2017&to=5/3/2017 ChangeLog ========= 3 March 2017: ------------- * And now I made +libssh2.so+ compile on linux too :) I think Iceberg is fixed now for linux, can someone with linux try +vmLatest60+. * I worked on VM for linux, this time fixing dependencies for libgit2: it was not working because it was trying to link libssh2 existing in the system instead the one we provide (a problem with rpath)... I figured out I need to add some CMAKE options: ---- -DCMAKE_SKIP_BUILD_RPATH=FALSE -DCMAKE_INSTALL_RPATH="." ---- otherwise +make install+ was ignoring the +-Wl,rpath,.+ configuration. With this it seems to be working, but now I have a problem with +libssh2+ compilation. I'll see this next. * I took some moments to fix a problem on new UFFI version (0.26): Now, structures use a class variable to keep the offset value of a field. So now, instead having an accessor to a field of the form (for example): ---- MyStructure>>myField ^ handle unsignedLongAt: 42 ---- ... now you have an accessor of the form: ---- MyStructure>>myField ^ handle unsignedLongAt: OFFSET_MYFIELD ---- this is necesary to allow different platforms to use same structures (because sizes of fields, and in consequence of offsets of them inside a stricture are different). This 'offsets' are calculated (as structure compiled specs) at first access to +#compiledSpec+ of structure, which usually happens when you use it first time... but now always, as [case: 19788](https://pharo.fogbugz.com/f/cases/19788) shows. Well, now I fixed that :) 2 March 2017: ------------- * I added a Discord link on [http://pharo.org/community](http://pharo.org/community)... I want to slowly start moving our community there. I know Slack is very popular among us this days but Dicords offers some advantages (like no 10k limit on messages and a powerful search). 1 March 2017: ------------- * ... and now I made the [case:19783](https://pharo.fogbugz.com/f/cases/19783), to make SDL2 work on 64bits (it works!) :) * Yesterday I spent the full day debugging a VM to see why Athens was not working for 64bits and I finally figured out the problem was in image and not in VM :P As a result of the work, I produced this fixes: * [case:19781](https://pharo.fogbugz.com/f/cases/19781) to fix a problem answering pointers on callbacks. * [case:19782](https://pharo.fogbugz.com/f/cases/19782) to actually prepare Athens. With this two cases, Athens works in 64bits (almost) :) Now there is a problem in 64bits callbacks that makes the +VGTigerDemo runDemo+ to fail after some cycles. Since this problem does not happens on 32bits, I assume there is a problem on how callbacks work on 64bits. I'm not working on that (I will work also in migrating SDL2). 27 February 2017: ----------------- * Well, I spend some time trying to blindly figure out why athens may crash time to time when drawing surfaces, basically testing the apprachs [Ronie proposes](http://forum.world.st/Too-frequent-crashes-td4927143i20.html#a4934027). First approach consists on copying data to not rely on a surface at all. Problem with this is that it involves a whole full copy, that causes a lot of GC that pauses a lot the image... so smoothness is gone. Second approach seems a lot more doable, but I still don't know if it works: ---- Form subclass: #AthensCairoSurfaceForm instanceVariableNames: 'surface' classVariableNames: '' package: 'Athens-Cairo' AthensCairoSurfaceForm>>surface ^ surface AthensCairoSurfaceForm>>surface: anObject surface := anObject AthensCairoSurface>>asForm "create a form and copy an image data there" self checkSession. self flush. ^ (AthensCairoSurfaceForm extent: (self width@self height) depth: 32 bits: id) surface: self; yourself ---- this will prevent surfaces to be garbage collected before it's time and seems to be working fine (at least in my machine). cheers! Esteban

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An implementation of a cache in instance variables
by Guillaume Larcheveque March 9, 2017

March 9, 2017

Hi, at Synectique, we are using cache for lots of projects and for now we were always using another instance variable or a dictionary to store many. It is complicated to maintain and we are always reinventing the wheel. That's why i created a first implementation (very naive but functional, documented and tested) of a cache. It is available here (with usage explication): http://smalltalkhub.com/#!/~GuillaumeLarcheveque/SmallCache and you can get it by doing: Metacello new smalltalkhubUser: 'GuillaumeLarcheveque' project: 'SmallCache'; configuration: 'SmallCache'; version: #development; load Tell me if you are interested in it or if you have ideas about it. -- *Guillaume Larcheveque*

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Using PharoShortcuts for code completion
by komarlu2＠fit.cvut.cz March 9, 2017

March 9, 2017

Hello to all, would it be ok to implement a category in PharoShortcuts called "keymaps-code completion" where all the shortcuts for the suggestion menu and code completion would be? I think this menu would qualify as a basic tool. - In the comment section it says it is for basic tools and to allow to change shortcuts from a single place. Thanks, Lukas

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Regarding the autocomplete project information
by Siddharth Gupta March 9, 2017

March 9, 2017

Hello, I am interested in taking up the autoComplete project. I played around Pharo last year too. Could you tell me places to start from, with respect to the autocomplete project. Regards Siddharth Gupta, Ph: 9871012292 Linkedin <https://www.linkedin.com/in/sidgupta234/> | Github <https://github.com/sidgupta234> | Codechef <https://www.codechef.com/users/sidgupta234> | Twitter <https://twitter.com/SidGupta234> | Facebook <https://www.facebook.com/profile.php?id=1483695876>

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Code Completion in Pharo
by komarlu2＠fit.cvut.cz March 8, 2017

March 8, 2017

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Code Completion in Pharo
by komarlu2＠fit.cvut.cz March 8, 2017

March 8, 2017

Hi to all, thank you so very much for all of the advices and suggestions to make it work. I'll do my best. Stef, I understand what you mean in the first message but I didn't understand the added part, where you explain the navigation. If you could explain some more, please? The -recognizing the whole selector- part but also these code expanding shortcuts you described (as well as writing rse and getting RubSmalltalkEditor as a suggestion) is now my priority to make them work. Lukas > One thing that is broken in current code completion and needs to be > addressed > is when you try to edit keyword messages. > > For example you have: > > dict at: #foo > > and you want to add ifAbsent: part. > > Current implementation won't help you, because it works out of context > and > doesn't recognize the whole selector. Same when you want to edit any > part of > keyword message. > > I'd like to see code completion operating on message send level, not on > word > (token?) level. + 1 I would love also to have it -> ifTrue: [ | cursor here ] and also even if this is not strictly about completion selector: navigation | self at: key ifAbsent: then self |at: key ifAbsent: then self at:| key ifAbsent: then self at: key |ifAbsent: > Is it clear what I'm trying to say?

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New version of Pillar
by Stephane Ducasse March 8, 2017

March 8, 2017

Hi We are happy to announce a new version of Pillar for Pharo 50 and 60. Thanks Maxime Roelandt for the help. Features - Now we can rebuild the mooc slides (the metadata is correctly handled) - The double walking of the tree fixes by Yann Dubois is integrated. - We checked and we can produce HTML, books and slides The version 4.0.7 will be the last stable version for Pharo 50. On Pharo 60 we will start a large cleaning. Here is the list:

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