May 2020 - Pharo-users - lists.pharo.org

Re: [Pharo-users] New type of web application using HTML, CSS and Smalltalk

by Erik Stel

Hi Konrad, Correct, the minimal image is running on SqueakJS VM. You can find info here: https://squeak.js.org Interesting question regarding deployment. In my current setup you do need the server, but it is not unrealistic to have a setup in which at some point the client is asked to create a snapshot. The SqueakJS VM does allow this. This snapshot could be stored somewhere as a final application. It could even be possible to stop the communicator and remove it (as well as a few other classes) from the image before taking the snapshot and kind of sealing the application like that. So it could be a way of creating standalone web applications. If that was the thought behind the question. I did use this mechanism of creating snapshots in an attempt to strip down a regular Pharo image and create the small image to run inside the browser. Until I decided that route was longer than doing the bootstrap route of creating an image from scratch ;-). Regards, Erik -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

May 5, 2020

Re: [Pharo-users] Pharo 8 - OSProcess or OSSubProcess or ?

by tbrunz

Hi Paul, This blog post from Christopher Fuhrman may answer your question: https://fuhrmanator.github.io/2019/03/16/LibC-Pharo-experiments.html -Ted -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

May 5, 2020

Re: [Pharo-users] Pharo 8 - OSProcess or OSSubProcess or ?

by Paul DeBruicker

Thanks Torsten That definitely works great. Sometimes I mistype the commands. Is there a way to get the error rather than an empty string? e.g. running LibC resultOfCommand: 'dur' gives an empty string rather than sh: dur: command not found ? Paul Torsten Bergmann wrote > Hi Paul, > > you can use: > > LibC resultOfCommand: 'dir' > > which is part of standard image. > > Bye > T. > > >> Gesendet: Montag, 04. Mai 2020 um 20:05 Uhr >> Von: "PAUL DEBRUICKER" < > pdebruic@ > > >> An: "Any question about pharo is welcome" < > pharo-users@.pharo > > >> Betreff: [Pharo-users] Pharo 8 - OSProcess or OSSubProcess or ? >> >> Hi - >> >> What is the recommended way to run a shell command from Pharo 8 and >> get the output from stdout into the image? >> >> >> Thanks >> >> Paul >> -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

May 5, 2020

Re: [Pharo-users] mentor question 4

by Richard O'Keefe

As a coding experiment, I adapted Trygve Reenskoug's code to my Smalltalk compiler, put in my code slightly tweaked, and benchmarked them on randomly generated data. Result: a factor of 6.3. In Squeak it was a factor of ten. I had not, in all honesty, expected it to to be so high. On Tue, 5 May 2020 at 02:00, Trygve Reenskaug <trygver(a)ifi.uio.no> wrote: > > A coding experiment. > Consider a Scrum development environment. Every programming team has an end user as a member. > The team's task is to code a credit card validity check. > A first goal is that the user representative shall read the code and agree that it is a correct rendering of their code checker: > > luhnTest: trialNumber > | s1 odd s2 even charValue reverse | > ----------------------------------------------- > " Luhn test according to Rosetta" > "Reverse the order of the digits in the number." > reverse := trialNumber reversed. > "Take the first, third, ... and every other odd digit in the reversed digits and sum them to form the partial sum s1" > s1 := 0. > odd := true. > reverse do: > [:char | > odd > ifTrue: [ > s1 := s1 + char digitValue. > ]. > odd := odd not > ]. > "Taking the second, fourth ... and every other even digit in the reversed digits: > Multiply each digit by two and sum the digits if the answer is greater than nine to form partial sums for the even digits" > "The subtracting 9 gives the same answer. " > "Sum the partial sums of the even digits to form s2" > s2 := 0. > even := false. > reverse do: > [:char | > even > ifTrue: [ > charValue := char digitValue * 2. > charValue > 9 ifTrue: [charValue := charValue - 9]. > s2 := s2 + charValue > ]. > even := even not > ]. > "If s1 + s2 ends in zero then the original number is in the form of a valid credit card number as verified by the Luhn test." > ^(s1 + s2) asString last = $0 > --------------------------------- > Once this step is completed, the next step will be to make the code right without altering the algorithm (refactoring). The result should be readable and follow the team's conventions. > > > P.S. code attached.

May 5, 2020

Re: [Pharo-users] Pharo 8 - OSProcess or OSSubProcess or ?

by Torsten Bergmann

Hi Paul, you can use: LibC resultOfCommand: 'dir' which is part of standard image. Bye T. > Gesendet: Montag, 04. Mai 2020 um 20:05 Uhr > Von: "PAUL DEBRUICKER" <pdebruic(a)gmail.com> > An: "Any question about pharo is welcome" <pharo-users(a)lists.pharo.org> > Betreff: [Pharo-users] Pharo 8 - OSProcess or OSSubProcess or ? > > Hi - > > What is the recommended way to run a shell command from Pharo 8 and get the output from stdout into the image? > > > Thanks > > Paul >

May 4, 2020

[ANN] Willow-SpinKit v8.0.0 [v8.0.0] released!

by Buenos Aires Smalltalk

May 4, 2020

Pharo 8 - OSProcess or OSSubProcess or ?

by PAUL DEBRUICKER

Hi - What is the recommended way to run a shell command from Pharo 8 and get the output from stdout into the image? Thanks Paul

May 4, 2020

Re: [Pharo-users] MetaLinks for Dynamic Contracts

by Ben Coman

On Mon, 4 May 2020 at 05:19, Evan Donahue <emdonahu(a)gmail.com> wrote: > Hello, > > I am returning to some work in Pharo after about ~2.5 years and reminding > myself of what I was working on before I got sidetracked. It appears > > I had mostly finished for release a dynamic contracts library for run time > type checking based on Racket's contract library.[1] However, it relied on > some hackery to interact well with the TestCoverage class, since both the > contract and the TestCoverage wanted to replace the method during the run > of a test. However, since it seems in Pharo 8 the TestCoverage class is no > longer present, this seems like a good time to re-evaluate the project > before I go in to see what needs to be patched up. I therefore have three > questions: > > 1) Are there now any existing libraries for dynamic contracts that I > should use instead of patching my old library? > > 2) Is MetaLinks the preferred way to intercept messages, > > and if so can someone point me to the repo (I can't seem to find it on > Github)? > There is no repo for MetaLinks. It comes batteries installed. (i.e. its in the image) cheers -ben

May 4, 2020

Re: [Pharo-users] mentor question 4

by Trygve Reenskaug

*Â A coding experiment.* Consider a Scrum development environment. Every programming team has an end user as a member. The team's task is to code a credit card validity check. A first goal is that the user representative shall read the code and agree that it is a correct rendering of their code checker: Â Â Â luhnTest: trialNumber Â Â Â Â Â Â | s1 odd s2 even charValue reverse | ----------------------------------------------- /" Luhn test according to Rosetta" "Reverse the order of the digits in the number."/ Â Â Â reverse := trialNumber reversed. /"Take the first, third, ... and every other odd digit in the reversed digits and sum them to form the partial sum s1"/ Â Â Â s1 := 0. Â Â Â odd := true. Â Â Â reverse do: Â Â Â Â Â Â [:char | Â Â Â Â Â Â Â Â Â odd Â Â Â Â Â Â Â Â Â Â Â Â ifTrue: [ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â s1 := s1 + char digitValue. Â Â Â Â Â Â Â Â Â Â Â Â ]. Â Â Â Â Â Â Â Â Â Â Â Â odd := odd not Â Â Â Â Â Â ]. /"Taking the second, fourth ... and every other even digit in the reversed digits: Multiply each digit by two and sum the digits if the answer is greater than nine to form partial sums for the even digits" Â Â Â "The subtracting 9 gives the same answer. " "Sum the partial sums of the even digits to form s2"/ Â Â Â s2 := 0. Â Â Â even := false. Â Â Â reverse do: Â Â Â Â Â Â [:char | Â Â Â Â Â Â Â Â Â even Â Â Â Â Â Â Â Â Â Â Â Â ifTrue: [ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â charValue := char digitValue * 2. Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â charValue > 9 ifTrue: [charValue := charValue - 9]. Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â s2 := s2 + charValue Â Â Â Â Â Â Â Â Â Â Â Â ]. Â Â Â Â Â Â Â Â Â Â Â Â even := even not Â Â Â Â Â Â ]. /"If s1 + s2 ends in zero then the original number is in the form of a valid credit card number as verified by the Luhn test."/ Â Â Â ^(s1 + s2) asString last = $0 --------------------------------- Once this step is completed, the next step will be to make the code right without altering the algorithm (refactoring). The result should be readable and follow the team's conventions. P.S. code attached.

May 4, 2020

[ANN] Willow-Bootstrap v12.0.0 [v12.0.0] released!

by Buenos Aires Smalltalk

May 4, 2020