November 2018 - Pharo-users

Re: [Pharo-users] About the IoT Hackathon last Friday

by Offray Vladimir Luna CÃ¡rdenas

Great video guys! The only think I wonder when I saw hackathon and technical videos in general is when/how we will get more diversity represented in the participants (ethnicities, ages, gender), but of course this is a hard open question that we all need to solve. Cheers, Offray On 17/11/18 9:15, Norbert Hartl wrote: > To get a better impression we made an image film of the event. Now the > 4K version is available on youtube. > > https://www.youtube.com/watch?v=dIl9FAatKyw > > hope you like it, > > Norbert > > >> Am 22.10.2018 um 16:23 schrieb Sven Van Caekenberghe <sven(a)stfx.eu >> <mailto:sven@stfx.eu>>: >> >> Last Friday we went to the IoT Hackathon in KÃ¶ln and it was a great >> experience. >> >> Thank you Norbert, Christian, Markus and the whole ZweiDenker team >> for their generous hospitality: the accommodations where great >> (beautiful office), the food and drinks super tasty, everybody >> friendly and welcoming. >> >> Thank youÂ Allex (Oliviera, Inria/RMOD) for running the workshop and >> for being so patient, friendly and tireless in helping everyone with >> all aspects of getting experiments up and running. >> >> I knew about PharoThings [1] and TelePharo [2] before, but actually >> using it in practice to experience connecting software and hardware >> felt a bit like magic. Thank you Denis (Kudriashov) and Inria/RMOD >> for developing these packages. >> >> <PastedGraphic-1.tiff> >> >> <PastedGraphic-2.tiff> >> >> Sven >> >> [1]Â https://github.com/pharo-iot/PharoThings >> [2]Â https://github.com/pharo-ide/TelePharo >> >> >

Nov. 24, 2018

Re: [Pharo-users] Lambda World 2018 - What FP can learn from Smalltalk by Aditya Siram

by Offray Vladimir Luna CÃ¡rdenas

I saw it and really like it. Particularly the part where the speaker says that is impressed about what a small community with not much funding can do. Because this is also truth and doesn't hurt at all. I don't know about the garbage collector. In my case, the more I use the image and load things on it, the more it becomes slow, but not really that much and now I can bootstrap kind of the same state in other image in a really reproducible way, including loading external interactive Grafoscopio documents. Talking about numbers, I think that Nadia Eghbal [1] and Benjaming Mako Hill[2] are making a great job approaching critically to Libre Open Source communities and demystifying the Bazar and Big Communities behind peer production and showing how most of the projects are done by small communities and how the average FLOSS project has a median of one developer. That doesn't mean that we are living in a dreamed world, because relying on one person for 97% of the FLOSS over there is clearly and risk the more that infrastructure becomes digital and relying on FLOSS. What that means is that we need to care about increasing the single developer mean for the projects we are working on and that is a concrete approachable goal. If the Pharo community can make some much with so little, imagine what we can do with a median of three developers for project! This is where promoting efforts should be located, in my opinion. [1] https://nadiaeghbal.com/ [2] https://mako.cc/ I shared the talk, and several of the Nadia's and Mako's links, with the local Grafoscopio community (40 members in the Telegram chat and less that 50 in the mailing list, with some members overlap between them and with four average active members, not all coders). Cheers, Offray On 23/11/18 18:29, horrido wrote: > I didn't like the fact that he said the Pharo community was really, really > tiny, even compared to the likes of Clojure. > > Because the truth hurts. > > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html > >

Nov. 24, 2018

Re: [Pharo-users] My Keynote at the Salta Conference

by Offray Vladimir Luna CÃ¡rdenas

Hi, Thanks for your positive and critical comments, as usual Ben. Richard I think that is important to listen to a community when reaching to it (I remember a talk we had where I suggested an approach closer to anthropology instead of marketing). Many of us value your contributions, despite of approaching them in a critical way. For example, I think that promotion is important, but popularity is not, and the later is not a proper measure of the effectivity of the former. As a Latin American (that means people born and rise Latino America, not Latinos living in United States) for me is really alien the North American people (that means people living in the North region of the American continent that goes from Alaska to Patagonia and beyond) is kind of obsessed with popularity, competition, winning and losing, at least for what popular media depicts (even seems that loser is kind of a big insult over there). I don't think that winning a competition is the best way of making a younger become part of collaborative open community. Also, in an interconnected world, I feel more inclined to volunteer my time helping a young person from the Global South to become part of the Pharo/Smalltalk community that to volunteer my time for a pretty localized competence in a particular place of the Global North. That being said, I think that little money can help a lot (specially in the Global South) and I like the idea of making young people interested in the offerings that Smalltalk has. The average FLOSS project has a media of one developer [1], so even winning one more after the competition is a big win. But I would try to volunteer my time in something that brings the gap between Pharo communities and young people and between the Global North and the Global South, specifically in my Pharo powered project, Grafoscopio. [1] https://mako.cc/writing/hill-when_free_software_isnt_better.html So I'm glad that you are open to suggestions. Here come mine about how this could be done, but this may also become something totally different of your actual proposal, but, hopefully, also more global, interesting, long lasting and a middle point between your promotional efforts and the activities of this community. # The Smalltalk Global Campfire Is an immersive inclusive global experience where new people (regardless of age, ethnicity or gender) can participate in a Smalltalk powered project and get mentorship from community members and start a long lasting relationship with a powerful technology, Smalltalk, and the friendly communities around it. ## How it will work Seasoned global Smalltalkers will propose a "tent", which is a set of related campfire projects (one or many) directed towards newbies, related with programming and coding, but also connected them with other activities which recognize that people comes from different backgrounds, have different interests and that an inclusive tech community is more than code[2]. The projects will allow newbies to learn coding, but also to express and connect it with wider concerns (documentation, civic tech, entrepreneurship, gaming, learning, etc). [2] https://morethancode.cc/about/ Interested campers will find the different tents where they can join and the tent leader will prepare a set of (increasingly complex?) activities for the members of the tent. Campers will work in the activities on a weekly basis and setup and open source code repository for working together. Coordination language for the Global Campfire will be English for tent leaders, but campers can use native language for communication between them and for some activities (local documentation, translations) as we don't want to impose a unique language to become part of a community and we recognize active Smalltalkers from around the world that can help local communities, made them stronger and better connected. ## Tent medals Becoming part of a open collaborative community is mostly about being able to help each other and how you and the community create value for each other. So while this is not a competition, we recognize that small money can be an important incentive to keep communities dynamic. At the end of the Campfire the community will provide with Member Badges and Tent Medals which recognize the work done by all the participants and also will give a small money incentive for the tent that made the best work, so the tent can decide how to spend it better. The evaluation will be done for each Tent leader, and also two external judges. The Tent Medals will be: * 1 Gold Medal: XXX Dollars. * 1 Silver Medal: XYZ Dollars. * 1 Bronze Medal: ABC Dollars. ## Closing I really don't know about the details here: How do we assign the prices? There is any better place that the one referred at [2] to showcase the important of going beyond code in tech communities? What is the proper duration for the Campfire? This is just a draft, but I think that this is something I would like to volunteer for and serves better the need for new people in our community, and can be also addressed from our local context and particular projects while connecting more the global community. On 21/11/18 10:23, Ben Coman via Pharo-users wrote:

Nov. 24, 2018

Re: [Pharo-users] Lambda World 2018 - What FP can learn from Smalltalk by Aditya Siram

by horrido

I didn't like the fact that he said the Pharo community was really, really tiny, even compared to the likes of Clojure. Because the truth hurts. -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

Nov. 23, 2018

Re: [Pharo-users] Lambda World 2018 - What FP can learn from Smalltalk by Aditya Siram

by Esteban Maringolo

I watched it and shared it to friends and social networks. I think it's an excellent example of good organic marketing from a not-so-much outsider, but certainly not daily user of Pharo, to an audience that might have heard about it for the very first time. Regards, Esteban A. Maringolo El vie., 23 nov. 2018 a las 16:39, Jimmie Houchin (<jlhouchin(a)gmail.com>) escribiÃ³: > > Hello, > > Interesting video using Pharo for presenting its points. > > https://www.youtube.com/watch?v=baxtyeFVn3w > > Wondering if anybody else has seen this video. What can be learned from > this outside perspective. > > He is mostly positive about Pharo and is using it as an example of > things he would like to see in his world. > > He does say that Pharo's GC is not good. > > Thoughts. > > Jimmie > > > > >

Nov. 23, 2018

Re: [Pharo-users] Lambda World 2018 - What FP can learn from Smalltalk by Aditya Siram

by Todd Blanchard

I saw it. I learned a lot about some things I didn't know about in Pharo. I had no idea how PetitParser worked. Now I'm intrigued. It was an interesting perspective because, while he wasn't pushing Smalltalk, he was pushing for other languages to pursue better environments and tools built in their own languages. Basically using Pharo as an inspirational "bar raiser" by saying "they did this - we should be able to do it too". Although I think a lot of why Smalltalk makes that stuff doable is the integrated graphical environment - something most other languages simply don't have. Not sure what to make of the knocks on Pharo's GC. I had thought the goal was a very aggressive collector to support multimedia > On Nov 23, 2018, at 11:37 AM, Jimmie Houchin <jlhouchin(a)gmail.com> wrote: > > Hello, > > Interesting video using Pharo for presenting its points. > > https://www.youtube.com/watch?v=baxtyeFVn3w > > Wondering if anybody else has seen this video. What can be learned from this outside perspective. > > He is mostly positive about Pharo and is using it as an example of things he would like to see in his world. > > He does say that Pharo's GC is not good. > > Thoughts. > > Jimmie > > > > >

Nov. 23, 2018

Lambda World 2018 - What FP can learn from Smalltalk by Aditya Siram

by Jimmie Houchin

Hello, Interesting video using Pharo for presenting its points. https://www.youtube.com/watch?v=baxtyeFVn3w Wondering if anybody else has seen this video. What can be learned from this outside perspective. He is mostly positive about Pharo and is using it as an example of things he would like to see in his world. He does say that Pharo's GC is not good. Thoughts. Jimmie

Nov. 23, 2018

Re: [Pharo-users] VPS difficulties

by Ben Coman

On Fri, 23 Nov 2018 at 04:02, horrido <horrido.hobbies(a)gmail.com> wrote: > Okay, I've resolved everything. First, the reason why I'm getting the > 'pthread_setschedparam failed' error when I run Pharo under Debian is > because it must be run as 'root'! Don't ask me why, but that's the reason > why Pharo can't set thread priorities. (This wasn't an issue under Ubuntu > Server â go figure.) > > Second, I am now using Pharo's own SHA256 class. It's probably not as > secure > (because it doesn't use a salt value) and not as quick to execute (not > being > C code), but for my purpose, it doesn't really matter. > > So I can use DigitalOcean or OVH to run my web server in a VPS. > Good to hear. But you shouldn't need to run Pharo as root, just be root to create this config file.... cat <<END | sudo tee /etc/security/limits.d/pharo.conf * hard rtprio 2 * soft rtprio 2 END cheers -ben

Nov. 23, 2018

Re: [Pharo-users] [ANN] JSON schema implementation

by Tudor Girba

Nice work! Thanks! Doru > On Nov 22, 2018, at 5:56 PM, Norbert Hartl <norbert(a)hartl.name> wrote: > > JSONSchema > =========== > > This is an implementation of JSON Schema for the pharo language. It is used to define the structure and values of a JSON string and to validate it. The schema itself can be externalized for being consumed by a third party. > > I like to announce the availability of a JSON schema implementation for pharo. As part of my implementation of OpenAPI (which is to be released a bit later) I factored out the JSON schema part into its own repository because I think it is useful. I release it even it is not really finished. Code is mostly undocumented and a lot of features are missing from the full spec. I will improve it slowly and add features as I need them or they being requested > > Hope you like it! > > Norbert > > ==== > > The documentation so far (from https://github.com/zweidenker/JSONSchema) > > It can be loaded by downloading it in pharo via > > Metacello new > repository: 'github://zweidenker/JSONSchema'; > baseline: #JSONSchema; > load > > Defining a schema > ------------------------- > > These are the expression to create a schema model inside pharo. > > schema := { > #name -> JSONSchema string. > #dateAndTime -> (JSONSchema stringWithFormat: 'date-time'). > #numberOfPets -> JSONSchema number } asJSONSchema. > > > defines as schema that can parse the following JSON: > > jsonString := '{ > "name" : "John Doe", > "dateAndTime" : "1970-01-01T14:00:00", > "numberOfPets" : 3 > }'. > > Reading/Writing a value using a schema > ------------------------------------------------------ > > To parse the value from JSON we only need to invoke: > > value := schema read: jsonString > > The object in value will have name as a string, dateAndTime as a DateAndTime object and numberOfPets as a SmallInteger object. > > The schema can also be used to write out the value as JSON. This is especially useful if we want to ensure that only valid JSON is written. For this invoke > > jsonString := schema write: value. > > Serialize/Materialize a schema > ---------------------------------------- > > Addtionally to reading and writing objects a schema can be serialized to string. > > schemaString := NeoJSONWriter toStringPretty: schema. > > gives > > { > "type" : "object", > "properties" : { > "name" : { > "type" : "string" > }, > "numberOfPets" : { > "type" : "number" > }, > "dateAndTime" : { > "type" : "string", > "format" : "date-time" > } > } > } > > > If we would get a schema as string we can instantiate by invoking > > schema := JSONSchema fromString: schemaString. > > Nested schemas > ----------------------- > > Schemas can be nested in any depth. And it can be specified by using the literal Array syntax. > > schema := { > #name -> JSONSchema string. > #address -> { > #street -> JSONSchema string. > #number -> JSONSchema number > } } asJSONSchema > > Constraints > --------------- > > JSON Schema has a defined set of constraints that can be specified. E.g. for a number the inerval of the value can be specified by > > numberSchema := JSONSchema number. > numberSchema interval > minimum: 1; > exclusiveMaximum: 100 > > constraining the number value to be greater or equal to 1 and smaller than 100. > -- www.feenk.com "What is more important: To be happy, or to make happy?"

Nov. 23, 2018

Re: [Pharo-users] Tracking method in and out with MetaLinks

by Marcus Denker

> On 23 Nov 2018, at 14:59, Marcus Denker <marcus.denker(a)inria.fr> wrote: > > > >> On 23 Nov 2018, at 13:40, Manuel Leuenberger <leuenberger(a)inf.unibe.ch> wrote: >> >> Hi, >> >> I stumbled upon another MetaLink scenario that I am unsure how to implement. I want to track method invocations, with receiver, arguments, selector, and return value (maybe even signaled exception). I can track the method input with a MetaLink installed on an RBMethodNode like this: >> >> MetaLink new >> metaObject: [ :c | Transcript show: c receiver; show: c method selector; show: c arguments; cr ]; >> selector: #value:; >> arguments: #(context). >> >> and for returns with a MetaLink on RBReturnNodes like this: >> >> MetaLink new >> metaObject: [ :v | Transcript show: v; cr ]; >> selector: #value:; >> arguments: #(value) >> >> The problem is though, that not all methods have explicit returns, and some mix explicit returns and self returns. I tried installed an #after MetaLink on a RBMethodNode, but this fails in many cases. Is there any way that I can instrument a method and track receiver, selector, arguments, and returned value (even if self) at the same time? >> > > I am working now on making the #after work so that one can get with #value the return of the methodâ¦ > > I now have a version where it works for Message Sends correctly *and* were #after on Method works better (the compilation errors should be fixed). > > But #value for #after on Method needs some more workâ¦ soon! > > I will commit this intermediate step now. > Here is the first step: https://github.com/pharo-project/pharo/pull/2011 â¢ #operation for send after â¢ #operation and value for {} arrays â¢ #after hooks: preamble now executed before the operation â¢ #after hooks: added concept of postamble, executed just before hook Next I need to look into #value for #after on methods. This got broken because we wrap the whole method in an exception handler (as #after should be called even if an exception happens). But this adds too much complexityâ¦ especially how it is done now. I think I will simplify that in a next step. Marcus

Nov. 23, 2018