December 2018 - Pharo-users

Aggregation framework in MongoTalk?
by phil＠highoctane.be Feb. 18, 2019

Feb. 18, 2019

Is there anyone using the aggregation framework of MongDb through MongoTalk? It uses the aggregate() command, so I was wondering if this could be supported out of the box or if there is a need for an additional Operation. TIA Phil

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Voyage
by horrido Feb. 8, 2019

Feb. 8, 2019

I'm trying to load Voyage for MongoDB and I'm having great difficulty. The docs seem to be out of date. What are the current instructions for doing this? The docs also refer to "Configurations Browser" in World Menu/Tools, but there is no longer any such thing. -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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GPS / Longitude / Latitude library
by Alistair Grant Jan. 14, 2019

Jan. 14, 2019

Hi, Does anyone know of a library for processing GPS coordinates? What I'm looking for are things like: - Parsing from and printing to various string formats (HMS, NESW, decimal) - Distance between two points - etc. Thanks, Alistair

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Re: [Pharo-users] adding instance variables (data) to the Object class
by Marcus Denker Jan. 13, 2019

Jan. 13, 2019

> On 6 Sep 2018, at 23:35, Petr Fischer via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > > From: Petr Fischer <petr.fischer(a)me.com> > Subject: adding instance variables (data) to the Object class > Date: 6 September 2018 at 23:35:26 CEST > To: pharo-users(a)lists.pharo.org > > > Hello! Weird question: why I can't add instance variables to the Object class (for example "oid" or something else)? Is it due to some internal (and different) VM "class layouts"? > > Or - can I inject my own information to all existing objects (any class)? > Behavior is a subclass of Object, too. So that means that you would add a ivar to all the classes, but for the VM an object can only be a class that has three ivars, and those are accessed by offset. So if you add an ivar, you shift the offset â> problem. As for âI want to add object specific stateâ: it would be nice to add an easy to use (and efficient) mechanism to do it. Marcus

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[ANN] P3 version 1.1
by Sven Van Caekenberghe Jan. 6, 2019

Jan. 6, 2019

Hi, I created a new release of P3, the modern, lean and mean PostgreSQL client for Pharo. https://github.com/svenvc/P3 Version 1.1 contains the following changes: - added support for Postgres Extended Query protocol (P3PreparedStatement) (thx Jan @jvdsandt) - added support for reading array type values (currently INTEGER[] FLOAT[] BOOLEAN[] TEXT[] VARCHAR[]) - added P3-Tests package and moved all tests there - more comments - more unit tests https://github.com/svenvc/P3/releases/tag/v1.1 Especially Jan's contribution adds a lot of functionality: the ability to work with prepared statements. Here is an example doing a batch insert of 100 records (which is more efficient). | client statement | client := P3Client url: 'psql://sven@localhost'. client execute: 'DROP TABLE IF EXISTS table1'. client execute: 'CREATE TABLE table1 (id SERIAL PRIMARY KEY, created_at TIMESTAMP DEFAULT NOW(), name TEXT)'. statement := client prepare: 'INSERT INTO table1 (name) VALUES ($1)'. statement executeBatch: ((1 to: 100) collect: [ :index | Array with: ('Text #', index printString) ]). client query: 'SELECT * FROM table1'. client execute: 'DROP TABLE table1'. statement close. client close. Season's Greetings to you all. Sven -- Sven Van Caekenberghe Proudly supporting Pharo http://pharo.org http://association.pharo.org http://consortium.pharo.org

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Re: [Pharo-users] [Moose-dev] glamorous toolkit: v0.4.0
by Tudor Girba Jan. 1, 2019

Jan. 1, 2019

> On Dec 28, 2018, at 1:08 PM, Kjell Godo <squeaklist(a)gmail.com> wrote: > > WOW :) What part of it do you like? Cheers, Doru > On Thu, Dec 20, 2018 at 01:57 Tudor Girba <tudor(a)tudorgirba.com> wrote: > Hi Luke, > > I am happy this looks exciting :). > > About the confusion part: The Glamorous Toolkit we are working on right now is a complete new world built on a complete new graphical stack that does is not based on the existing stack that ships with Pharo. It is not an evolution. It is a leap. > > The goal of the new GT is to propose a completely reshaped programming experience that enables moldable development. You will find the concepts from the old GT in the new world as well. For example, the Inspector is extensible in similar ways and the API is similar as well. > > But, in the new world, we are bringing the concept much further. For example, Documenter provides a whole new kind of a tool that can mold to unify multiple workflows (like data notebooks, code documentation, or tutorials) right in the IDE. Coder provides the infrastructure for manipulating code that can mold its shape as you type. Transcript allows you to embed various widgets to transform the otherwise dull experience of a console into a live one. > > Behind the scenes GT comes with several engines. The Examples engine enables example-driven development which also bridges the gap between testing and documentation effort, especially when combined with Documenter. Releaser is able to release deeply nested projects. Phlow offers an engine that shares similarities with Glamour. Completer provides moldable completion. Visualizer offers a couple of visualization engines such as Mondrian. > > All of these are possible because of the underlying graphical stack made of Sparta/Bloc/Brick. > > All in all, we believe that the new GT enables a new way of programming. Individual features can be attractive, but our goal is to reshape the development experience. > > Does this address the concern? > > Cheers, > Doru > > > > On Dec 19, 2018, at 2:09 PM, Luke Gorrie <luke(a)snabb.co> wrote: > > > > On Fri, 14 Dec 2018 at 05:13, Tudor Girba <tudor(a)tudorgirba.com> wrote: > > Please do let us know what you think .. and, of course, what you feel. > > > > I'm feeling excited and confused :). > > > > Excited because I love seeing all these new demos streaming out and I'm itching to put new capabilities to work. > > > > Confused about the roadmap. How does this "new" Glamorous Toolkit relate to the "old" one that I learned about last year from the Moldable Tools thesis? Is this a new version or a complete rewrite? Is it backwards compatible or completely reimagined? Is adopting the new version a seamless process or is porting required? Are frameworks like Glamour still there behind the scenes or were they replaced? etc. > > > > > > <gt-documenter-magic-markup.gif><gt-0-4-0.png>_______________________________________________ > > Moose-dev mailing list > > Moose-dev(a)list.inf.unibe.ch > > https://www.list.inf.unibe.ch/listinfo/moose-dev > > -- > www.feenk.com > > "Things happen when they happen, > not when you talk about them happening." > > _______________________________________________ > Moose-dev mailing list > Moose-dev(a)list.inf.unibe.ch > https://www.list.inf.unibe.ch/listinfo/moose-dev > _______________________________________________ > Moose-dev mailing list > Moose-dev(a)list.inf.unibe.ch > https://www.list.inf.unibe.ch/listinfo/moose-dev -- www.feenk.com "Yesterday is a fact. Tomorrow is a possibility. Today is a challenge."

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Re: [Pharo-users] (no subject)
by Offray Vladimir Luna CÃ¡rdenas Jan. 1, 2019

Jan. 1, 2019

Konrad, On 31/12/18 8:59, Konrad Hinsen via Pharo-users wrote: > > Thanks to everyone who replied - the sum of the answers is actually a > lot more useful than each one individually, as each one points to a part > of the puzzle that Pharo is (for me, at least, after roughly one month > of use). It's really nice to have you hear. I remember some of our Twitter conversations about reproducible research and the advantages that Pharo could bring in that front and is good to know that they will continue here with the stuff you're working on. I restarted with Pharo in 2014, after a short revealing experience with Squeak, EToys and Bots Inc in 2006-2007 and now I'm enjoying the Joyride[1] [1] https://twitter.com/offrayLC/status/493979407011561473 Yes, Pharo is strange and awesome and the same time. Be around, you'll be amazed. Offray

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how to use indexes to copy a substring out of a string
by Roelof Wobben Jan. 1, 2019

Jan. 1, 2019

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(no subject)
by Konrad Hinsen Dec. 31, 2018

Dec. 31, 2018

Hi everyone, I am confronted with an implementation choice that I expect to be not so rare, and I wonder what "the Pharo way" is for dealing with it. I will use a toy example for illustration, my real case is more complex but not fundamentally different. Suppose I want to represent arithmetic expressions that support various operations (evaluation, simplification, compilation to whatever language, ...). In the textbook discussion, I'd have a class hierarchy such as Expression (abstract) IntegerExpression VariableNameExpression SumExpression ProductExpression ... What I really want is not some IntegerExpression, but plain Pharo integers, and for variable names I want to use plain Pharo symbols. >From my current understanding of Pharo, my options are 1. Use wrapper objects for integers and symbols, i.e. have a class IntegerExpression that stores an integer in an instance variable. 2. Add the methods of my abstract Expression class to all the classes representing integers and symbols. 3. Implement my own dispatch that does not rely on method lookup. None of these really looks attractive. 1) adds a lot of overhead, both in the code ("IntegerExpression withValue: 5" rather than just "5") and at runtime. 3) also adds a lot of overhead because I have to implement my own dispatch. 2) would probably be the least effort, but looks like a kludge. For comparison, in the Lisp world (CLOS, Racket, ...) that I know much better, I would use generic functions and provide implementations for integers and symbols as well as for my own Expression types. So... how would you approach this problem? Thanks in advance, Konrad.

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rotating a morph through messaging
by Steve Quezadas Dec. 31, 2018

Dec. 31, 2018

I am experimenting with pharo right now, particularly with Morphs. The weird thing is that some morphs can have a rotation halo and others do not. This has a "rotate halo": bar := EllipseMorph new. bar openInWorld. This does not: foo := Morph new. foo openInWorld Am I missing something? Also, how do I send message "rotate" to a morph? I can't seem to find a "rotate" method anywhere in the browser. - Steve

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