May 2018 - Pharo-users - lists.pharo.org

On UDP broadcast
by Hilaire May 24, 2018

May 24, 2018

Hi, I try to figure out this matter. I am just new to this domain so excuse me for the obvious the errors. To broadcast an IP, this seems to work: | socket | socket := Socket newUDP. socket setOption: 'SO_BROADCAST' value: true. 10 timesRepeat: [ Â Â Â socket sendUDPData: '10.7.2.1'Â toHost: #[255 255 255 255] port: 9999. Â Â Â (Delay forSeconds: 1) wait. Â Â Â Â ]. socket closeAndDestroy. Then I can listen from the shell: with: nc -ulk 9999 Now for the listener part, I wrote something like: | socket data | socket := Socket newUDP. socket connectTo: NetNameResolver loopBackAddress port: 9999. socket waitForConnectionFor: 2. [data := socket receiveDataTimeout: 5. data crLog] ensure: [ socket closeAndDestroy] But I got an error when connecting the socket, the debugger message is: "InvalidSocketStatusException: Socket status must Unconnected before opening a new connection" So far I don't see understand this error. Port 9999 is not in use, and running again after this error the broadcast code does not lead to an error. Any idea? Thanks Hilaire -- Dr. Geo http://drgeo.eu

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[Ann] Some new iceberg videos
by Guillermo Polito May 24, 2018

May 24, 2018

Hi all, This time (just before releasing a new version of iceberg) I wanted to share some videos with you. Feedback is welcome. !! How to contribute to Iceberg https://youtu.be/yGr5HvVWM0M This video shows how to contribute to iceberg. For this, you should update your iceberg installation and then just do a pull request. This means that you need to start by forking https://github.com/pharo-vcs/iceberg - Path 1: Clone and pull (easy) - Clone your fork - Checkout the latest development branch (e.g., dev-0.7) - Pull from pharo-vcs/iceberg This path does not always work, as this is kind of self-brain surgery. Iceberg is updating itself. If this does not work, go to path 2 - Path 2: Install from scratch (if Path 1 does not work) - Use the script in the README file to unload and reinstall iceberg - Make sure you use the latest development branch in the Metacello script (e.g., dev-0.7) - Clone your fork and checkout the development branch Once you have the correct version, you can load the tests by loading the development group of the baseline. !! Basic Branching and Merging https://youtu.be/c0IgIT2s6Js This video shows in a simple example how to branch, merge and checkout different commits. In this video we first create a new class with a method, then we create another branch and force a conflict. We resolve the conflict during merge. In the middle, bonus feature, we checked out a commit and stayed in Detached HEAD for a while ;) !! Loading a baseline from your repository https://youtu.be/brUHEOr-p_E This video shows how to load a baseline from Iceberg's UI. We clone an existing project, see it is "Not loaded" and use Metacello plugin to load the default group. Enjoy, Guille PS: Tomorrow I'll answer the threads about Iceberg that were going around here in the mailing list. I was running today.

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GIFReadWriter and Animated GIFs
by Eric Gade May 24, 2018

May 24, 2018

Hello all, Please excuse the length of this email. A week or two ago I discovered that the GIF implementation in Pharo (and possibly Squeak?) is incomplete. This has two side effects: 1) Not all GIF data will load correctly; 2) There is for now no way to display animated GIFs. It looks like the corresponding classes have not been updated since the 90s. But fear not! I've been working on a solution, and need the community's feedback and advice. # The Problem with GIFs # One of the issues here is that GIF files can (and do) contain multiple images inside of them. The root header will supply things like a "screen size" in which these nested images should be displayed. That also means that each nested image does not have to have the same dimensions as the parent object -- in fact, most are offset somewhere inside of the "screen." Additionally, each nested image will contain information about how it should be handled when animating. This is a crucial point. In many cases images are just updates of a small area that should be applied to the previous image in the set. GIFs call this attribute the "disposal," and this information is contained in a packed byte. Both GIFReadWriter and AnimatedGIFReadWriter have intentionally skipped/ignored the bits/bytes that store and keep track of these things. GIFReadWriter on its own will only read the first Form and does not store information about disposal, offsets, etc. These classes are not reading all the information we need to display GIFs! # My Solution # The attached changes file includes some preliminary updates to the GIFReadWriter class. Now when each nested image is read, it will be loaded into a collection called "frames" as a (new -- see attached package file) AnimatedImageFrame. Instances of this new class will store the disposal symbol, offset, and form for each nested image in the file. I have also created an AnimatedImageMorph which reads AnimatedImageFrame objects and cycles them based on the disposal re-drawing rules. # Trying This Out # To try this out, first load the attached changes file and the ST file. You'll need a FileReference to a gif file, so when you have one execute the following: ```smalltalk file := "your gif filereference here" img := AnimatedImageMorph fromGIFReader: (AnimatedGIFReadWriter formsFromStream: file readStream). img openInWorld. ``` # Issues # Not all GIF images work. This has to do with my implementation of the disposal (redrawing) rules for each frame. I'm still experimenting. I believe AnimatedGIFReadWriter should be deprecated and all appropriate functionality should be put into GIFReadWriter. If you all agree, I will make several changes to GIFReadWriter that I think will be helpful / necessary. AnimatedImageMorph is also incomplete. I'm not sure if I should subclass ImageMorph for this or not. # Your Feedback # If you disagree with any point of this architecture, please let me know. Also if you come across GIFs that do not animate or display properly, send them my way please! -- Eric

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[Ann] OSSubprocess 1.0.0
by Guillermo Polito May 24, 2018

May 24, 2018

Hi all, News from the OSSubprocess side. For those who do not know it, OSSubprocess is the library to call external processes from Pharo. These are the main points of this release. - 64bits support - Issues Working on both Pharo 6 and 7 - Issue #34: Adding tests to validate that the return code is correctly handled - Issue #27: Cleanup: remove OSSubprocess-Tests package - PR #26: Add stress tests This version works for Pharo >=6. Users of Pharo5 will need to stick with v0.2.5, because of non compatible changes in uFFI (required mostly for 64 bits). Additionally: - We moved the repository to pharo-contribution to remove pressure from Mariano for releases and integrations - We updated the configuration in the catalog - We decided to move to a 1.0.0 versioning schema because 0.* does look like the library is not stable and it actually is (We have been using it in pillar and iceberg for quite some time). You can load this version from the catalog or using with: Metacello new baseline: 'OSSubprocess'; repository: 'github://pharo-contributions/OSSubprocess:v1.0.0/repository'; load. Detailed changes log in - https://github.com/pharo-contributions/OSSubprocess/releases/tag/v1.0.0 - https://github.com/pharo-contributions/OSSubprocess/compare/v0.2.5...v1.0.0 If you have any issues (or PR!), we wait for your issue entry in https://github.com/pharo-contributions/OSSubprocess/issues Have a nice weekend, -- Guille Polito Research Engineer Centre de Recherche en Informatique, Signal et Automatique de Lille CRIStAL - UMR 9189 French National Center for Scientific Research - *http://www.cnrs.fr <http://www.cnrs.fr>* *Web:* *http://guillep.github.io* <http://guillep.github.io> *Phone: *+33 06 52 70 66 13

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Why doesn't Pharo 7 Iceberg write changes to the git filesystem as you go?
by Tim Mackinnon May 23, 2018

May 23, 2018

Hi - when trying out the new Iceberg with a bunch of developers and explaining the challenges of integrating git and files into a smalltalk realm of the image - there was a lot of interest in how this works. When you clone - you obviously see a series of files (in Tonel - nice) that are then brought into your image. If you edit a file like Readme.md (using a markdown editor) you will notice that git status will show you that this file has changed. However if you then edit some methods - and then look in the file system - git status doesnât show these? This in retrospect possibly feels weird - or does it? Iâm not sure anymore - and was wondering if there was a specific reason behind not mirroring code changes back to the file system as they happen? When you branch in Pharo, a command line git status does show that change - so some things clearly are being mirrored, just not code (Which Iâm guess happens briefly when you click commit?). Iâm curious now to understand the tradeoffs. Tim p.s. it is very nice for small private projects, to use a git client on your phone - edit a method or two on the train, commit your changes and then see your CI build the results and deploy a new website by the time you get offâ¦ yes its not the rich smalltalk environment for bigger changes - but tiny stuff, its quite nice to fallback on the traditional way.

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[TechTalk] TODAY, 17h: Pillar
by Marcus Denker May 22, 2018

May 22, 2018

Hi, Today, 17h europe time. Pharo TechTalk: Pillar https://association.pharo.org/event-2797069 Sorry for the late announcement (we did not know if we could make it today) Marcus

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LibFFI/NB Cairo External Module Not Found debugging
by Peter UhnÃ¡k May 22, 2018

May 22, 2018

Hi, some Windows users are repeatedly running into Pharo failing to load Cairo library on Windows (see stack screenshot at the bottom). The problem is that I have no idea how to even start debugging this. Is there some documentation on how Pharo loads libraries via FFI on Windows that I can start digging into? Note that the library is definitely present, as this happens only occasionally -- it can be fixed by restarting PC. But I cannot reasonably ask users to restart just because Pharo decided it doesn't feel like loading a library. Any pointers / docs / ideas appreciated. Thanks, Peter

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[Errors] email on error?
by sergio ruiz May 18, 2018

May 18, 2018

Is there Â a way to send an email on an error or exception? I have an app that runs live on a remote server, and I am finding that every now and then, the server will lock up, and I wonât know whatâs going on with it. Currently, i pull the image and run it local, but an email with a stack trace would be SUPER helpful. Thanks! ---- peace, sergio photographer, journalist, visionary Public Key:Â http://bit.ly/29z9fG0 #BitMessageÂ BM-NBaswViL21xqgg9STRJjaJaUoyiNe2dV http://www.codeandmusic.com http://www.twitter.com/sergio_101 http://www.facebook.com/sergio101

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UK Smalltalk User Group meeting - Monday May 21st
by Giovanni Corriga May 18, 2018

May 18, 2018

The next meeting of the UK Smalltalk User Group Meeting will be on Monday, 21st May. We'll meet at our now usual venue The City Pride ( http://www.cityprideclerkenwell.co.uk/ ) at 7pm. For this monthâs meeting, weâll do a session of bug hunting: fix a few things in our favourite Smalltalk frameworks and tools. If you'd like to join us, you can just show up at the pub. You can also sign up in advance at the meeting's Meetup page: http://www.uksmalltalk.org/2018/05/bug-hunting-monday-may-25th.html . See you there!

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Showing Keyboard events as Pharo goes weird when using an RD client for OSX
by Tim Mackinnon May 18, 2018

May 18, 2018

Hi - Iâm wondering if anyone has any experience using Pharo in a Remote Desktop environment? Ive been experimenting with MacInCloud.com and running Pharo there - however Iâve noticed that while it appears to run (and it reasonably performant) after a few seconds/minutes (I canât quite work out what causes it) certain keeps stop working - most importantly the Enter key (but also Cmd-P etc). It looks like its dishing out some kind of tab key (its invisible in the playground - the cursor just jumps forward a few characters) but Iâm not sure, and I wondered if I could print out key codes in Pharo to maybe spot what it is. But keyboard handling is not something Iâve dug into - and Iâm looking for a few pointers (or maybe someone has seen this problem before and might be able to suggest a solution). As I said, It starts out ok but then suddenly swaps to this behaviour (which makes coding then impractical). Restating the RD client doesnât make a difference (and Iâve tried 2 different ones now). Other remote mac apps like Notes donât seem to be affected and I have to exit the image and come back in to correct it. (I havneât tried saving in between to see if it then preserves this behaviour). Ulimately I was hoping to have an easy portable Pharo environment to sneakily take on holiday via an iPad. The approach is to try and compile Pharo for iOS (I did it a long time ago, but it was a pain - whereas a remote server seemed like a neat solution). Tim Sent from my iPhone

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