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

Re: [Pharo-users] Is lazy evaluation of infinite series possible?

by Erisa

The fibonacciSequence example was really helpful. I made a new class PowerSeries, a subclass of Generator. Then I defined a binary operation + as follows: + aPowerSeries ^ PowerSeries on: [ :ps | | a b | [ a := self next. b := aPowerSeries next. ps yield: (a + b) ] repeat ] This works perfectly. But now I am struggling with how to define multiplication. When I do PS1 * PS2, the first yield should be a := PS1 next. b := PS2 next. ps yield (a * b). Thereafter would come the PowerSeries, call it PSNew, (PS2 .* a) + (PS1 * PS2'), where .* is scalar multiplication (easy to implement) and PS2' is the original PS2 (i.e., rewound 1). I see several problems here. It looks like I need a way to clone (fork?) a PowerSeries since in this computation I need both the current PS2 and the original PS2 and be able to operate with them independently. Second, how do I define the generator so that it first yields the scalar (a*b) and thereafter is represented by the PowerSeries PSNew? Finally, will the recursion in the definition of * blow up rapidly? -- View this message in context: http://forum.world.st/Is-lazy-evaluation-of-infinite-series-possible-tp4897… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

May 30, 2016

Re: [Pharo-users] What should I name my nested packages?

by Peter Uhnak

Hi, are you referring to tags? If you right-click a package, you see options such as "Add tag...", "Promote as package", "Demote to package with tag". Peter On Mon, May 30, 2016 at 02:10:38PM -0400, Evan Donahue wrote: > Hello, > > Just a quick question as I work on refactoring and cleaning up a project > I've been working on. I notice that packages like Fuel appear in nice, > nested hierarchies in my code browser, with 'Core' nested under 'Fuel' even > though 'Core's package name is actually Fuel-Core. I'm wondering what I > have to do to get my own packages to nest similarly in the code browser > beyond just naming them accordingly. > > Thank you, > Evan

May 30, 2016

What should I name my nested packages?

by Evan Donahue

Hello, Just a quick question as I work on refactoring and cleaning up a project I've been working on. I notice that packages like Fuel appear in nice, nested hierarchies in my code browser, with 'Core' nested under 'Fuel' even though 'Core's package name is actually Fuel-Core. I'm wondering what I have to do to get my own packages to nest similarly in the code browser beyond just naming them accordingly. Thank you, Evan

May 30, 2016

Re: [Pharo-users] [ANN] New Pharo Glorp version and Book chapter

by Esteban A. Maringolo

2016-05-30 12:49 GMT-03:00 Guille Polito <guillermopolito(a)gmail.com>: > Cool! > > Do you know which are the changes that got harvested with the new port? I > mean, the issues fixed or the features added. An approximated changelog > would do... I don't know, I could collect them from the Cincom Repository, I just took a look and there are over 100 commits of the Glorp bundle between 2012 and 2015. I'll perform a few queries, in Glorp, to retrieve them and summarize it wherever possible. I can easily recall changes in the Query API and features like supporting SQL's IN operator, as well as others, and support for newer versions of the platforms. One important step, is that we know which version we forked from, in the past in the Glorp mailing list happened many times they told me "use this or that" and it wasn't supported, and we didn't know how to compare feature support. Glorp lacks a good versioning strategy and just follows VW release numbers, for Pharo I decided this port will be 2.0 and use semantic versioning for future releases. > -------- Original Message -------- >> >> Thanks all. There were several people that helped me along this >> endeavor and I thank again the Pharo Consortium for pushing this. >> The Garage drivers got hurt by the changes in the FFI API (UFFI), but >> there are some people working on getting them back for Pharo 5. This >> is really important, and for those RDBMS you mention in particular, >> according to a survey [1] I did at the end of last year. We'll get >> there. > > That's strange. Mysql, Postgresql and Sqlite are working both for windows > and linux, pharo 4 and 5. > > The only one that is not yet working is opendbx. > > Is there something I'm not aware of? Pharo 4 is out of the question because it uses the old FFI. PostgreSQL and MySQL are native, so they weren't affected by FFI. But for the latest version the Garage SQLite3 driver passes its own tests (Garage ones), but when the Glorp Test suite is run with it as its driver, lots of tests fail, related with basic things of SQLite, not Glorp. I raised this concern at the beginning of this month in the #databases channel in Slack. I was delaying the release because of SQLite3 support, but couldn't wait more. However Pierce Ng (maintainer of the SQLite3 FFI driver) is working on it, but not as part of Garage AFAIU. >> Also, I copied the latest commit from the SmalltalkHub repo to GitHub >> in order to use its issue tracker [3] for bug reporting. > > Nice! > Soon we will have git support by default in Pharo :) I heard about it, I look forward to see it in action :) Regards!

May 30, 2016

Re: [Pharo-users] Mongo-BSON OID LargePositiveInteger increase

by Henrik Johansen

> On 30 May 2016, at 5:49 , Henrik Johansen <henrik.s.johansen(a)veloxit.no> wrote: > > A few more comments below; I'm not seeing the things you describe when testing in my image... > >>> >>> | id | >>> id := LargePositiveInteger. >>> 1 to: (16777215 + 50) do: [:each | >>> id := id digitAdd: 1]. >>> id. >>> >>> Given the comment it should overflow and the value be 50? This is not what the result is. So shall the truncation be added again or at least the comment be updated? The code will go from LargePositiveInteger to SmallInteger when overflowing from three to four bytes > > On which VM does it overflow to SmallInteger? I've never seen this, on the one I tested the expression in last mail, the "overflowing" digitAdd: returned a 4-byte LargePositiveInteger. It's starting to come back to me; IIRC, + will normalize results to SmallIntegers, digitAdd: will not. I thought it would be nice to use a single replaceFrom:to:with:startingAt: call to insert the entire counter; however, I didn't bench that particular part. So while the rewrite overall gained a small amount of speed, it turns out digitAdd: is quite slow (even though it's a primitive), so reverting to using Smallinteger arithmetic for the counter, and inserting the counter a digit at a time is most likely worth it: "Pharo4, LargeInteger counter" [OID new] bench '1,194,004 per second' "Pharo4, reverted to SmallInteger counter" [OID new] bench '1,681,203 per second' The relevant changes should be present in attachment. Cheers, Henry

May 30, 2016

Re: [Pharo-users] [ANN] LibnotifyBinding: a binding to libnotify 0.7.6 for Pharo

by Julien Delplanque

On 30/05/16 18:02, Esteban Lorenzano wrote: >> On 30 May 2016, at 16:50, Julien Delplanque <julien(a)tamere.eu> wrote: >> >> Hello, >> >> I took the libnotify [0] binding for Squeak [1], adapted it to use the Pharo UFFI API and >> enhanced it. It is available here [2] and seems to work well (see attached image). >> >> It does not cover all libnotify possibilities (see the README on github) but it is already >> usable to display notifications with eventually icons, set urgency, set timeout, etc... >> >> It was great to try UFFI, it is really easy to use. Thanks a lot for it! :-) > thank you for your feedback, is highly appreciated :) > > â¦ and I have a project who will benefit from libnotify, so, thanks you :D If you see strange things in the code, or things that could be enhanced don't hesitate to report them using Github issues. :-) Julien

May 30, 2016

Re: [Pharo-users] QCMagritte & Voyage

by Stephan Eggermont

We mostly deployed QCMagritte on Gemstone, so have not done much work on persistency hooks. Please feel free to insert them at appropriate places. Stephan Verstuurd vanaf mijn iPhone

May 30, 2016

Re: [Pharo-users] Mongo-BSON OID LargePositiveInteger increase

by Henrik Johansen

> On 30 May 2016, at 5:49 , Henrik Johansen <henrik.s.johansen(a)veloxit.no> wrote: >>> >>> PS: The other part is that >>#newCounter doesn't seem to be ever executed. On first load >>#initialize will call >>#reset and on >>#shutDown: calls reset. So the code to "randomize" the initial counter doesn't seem to work. > > What? > OID class >> #initialize adds the class to the shutdown list, so it *should* call shutDown: whenever the image is saved&quit. > newCounter should then be called on first request after startup, since machineIdentifier is set to nil by reset. /doh, I see it now. reset should do counter := nil, not counter := LargePositiveInteger new: 3 . PEBKAC when rewriting the old counter := 0 reset code, I'm afraid :/ Cheers, Henry

May 30, 2016

Re: [Pharo-users] [ANN] LibnotifyBinding: a binding to libnotify 0.7.6 for Pharo

by Esteban Lorenzano

> On 30 May 2016, at 16:50, Julien Delplanque <julien(a)tamere.eu> wrote: > > Hello, > > I took the libnotify [0] binding for Squeak [1], adapted it to use the Pharo UFFI API and > enhanced it. It is available here [2] and seems to work well (see attached image). > > It does not cover all libnotify possibilities (see the README on github) but it is already > usable to display notifications with eventually icons, set urgency, set timeout, etc... > > It was great to try UFFI, it is really easy to use. Thanks a lot for it! :-) thank you for your feedback, is highly appreciated :) â¦ and I have a project who will benefit from libnotify, so, thanks you :D Esteban > > Regards, > > Julien > > Links: > [0]: https://developer.gnome.org/libnotify/ > [1]: http://www.squeaksource.com/libnotify.html > [2]: https://github.com/juliendelplanque/LibnotifyBinding > <hello-from-pharo-libnotify.png>

May 30, 2016

Re: [Pharo-users] [ANN] New Pharo Glorp version and Book chapter

by Guille Polito

Cool! Do you know which are the changes that got harvested with the new port? I mean, the issues fixed or the features added. An approximated changelog would do... -------- Original Message -------- > Thanks all. There were several people that helped me along this > endeavor and I thank again the Pharo Consortium for pushing this. > > 2016-05-30 5:04 GMT-03:00 Denis Kudriashov <dionisiydk(a)gmail.com>: >> Good job, Esteban. >> Now we need good Garage drivers for databases which not lock image. Does >> anyone plan to work on Oracle and SQLServer backends? > The Garage drivers got hurt by the changes in the FFI API (UFFI), but > there are some people working on getting them back for Pharo 5. This > is really important, and for those RDBMS you mention in particular, > according to a survey [1] I did at the end of last year. We'll get > there. That's strange. Mysql, Postgresql and Sqlite are working both for windows and linux, pharo 4 and 5. The only one that is not yet working is opendbx. Is there something I'm not aware of? > > Those willing to discuss issues or collaborate on these topics can > always use this mailing list, but there is an active community of > developers in the Pharo Project Slack team, we have one channel > dedicated to database discussion [2]. > > Also, I copied the latest commit from the SmalltalkHub repo to GitHub > in order to use its issue tracker [3] for bug reporting. Nice! Soon we will have git support by default in Pharo :) > > Regards! > > [1] https://medium.com/@emaringolo/pharo-rdbms-support-survey-results-9c8f64087… > [2] https://pharoproject.slack.com/messages/databases/ > [3] https://github.com/DBXTalk/Glorp/issues >

May 30, 2016