May 2013 - Pharo-users - lists.pharo.org

String replacement
by Thomas Worthington May 28, 2013

May 28, 2013

I've got a string which is the header section of an email. I have a regex which will split a header field name from its data (ie, "From: jim(a)null.com" becomes "From" and "jim(a)null.com") but some header lines are long and have been continued by inserting a newline and one or more spaces. Before splitting the fields I need to undo these continuations by deleting these combinations of a newline followed by some whitespace. This would certainly be trivial in Perl or any of the normal Linux regex engines but I've spent hours on this today, equipped with the PBE2 chapter, and got nowhere. How do I do this in Pharo? Thanks, Thomas

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ORM with PostgreSQL support
by Bahman Movaqar May 27, 2013

May 27, 2013

Hi all, I'm completely new to Smalltalk world so please bear with me. Coming from the Java world, I'm used to using an ORM when developing a database-backed application. What are the options in the Smalltalk world? I'm specially looking for something that supports PostgreSQL as that's what I 99.99% of the time use :-) Would you please give me some pointers along with links to the documentations? TIA, -- Bahman Movaqar (http://BahmanM.com) ERP Evaluation, Implementation, Deployment Consultant

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How to install SandstoneDb
by Bahman Movaqar May 27, 2013

May 27, 2013

What is the correct way to install `SandstoneDb' in Pharo 2.0? With the approach Pharo book takes[1], Pharo complains about two other packages to be installed as well: `DataStream' and `SmartRefStream'. TIA, [1] http://book.pharo-project.org/book/PharoTools/SandstoneDB -- Bahman Movaqar (http://BahmanM.com) ERP Evaluation, Implementation, Deployment Consultant

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Video: The Moose Roadmap
by Stephan Eggermont May 23, 2013

May 23, 2013

Another video from the MooseDay2013 Tudor Girba showing the Moose roadmap http://www.youtube.com/watch?v=2JCDS3OVnGM Stephan

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history graph widget
by Martin Dias May 22, 2013

May 22, 2013

Hi I would like to have a Morphic widget like this. Does anyone know if there is something already done that I could reuse? [image: Inline image 1] Maybe do it with Roassal in this way: Use the list morph, where each row knows an image morph with its corresponding slice of the graph. Each time the graph changes (for example, if a node is appended), render using Roassal the part of the graph has to be updated, and cut the rendered surface in the new slices for each updated row. Any opinion? Maybe I should think more in vectors (i.e. Athens) instead of pixels/images? Cheers, Martin

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SmalltalkWorld chartFrameworks.
by Juan Ignacio Vaccarezza May 21, 2013

May 21, 2013

Hi all, Does anybody know a chart framework? Im looking fo something like jfreechart (java chart framework). I need bar graph, pie chart, and line chart. Thanks, Juan

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[ANN] ZnReadEvalPrintDelegate
by Sven Van Caekenberghe May 16, 2013

May 16, 2013

Hi, Here is a little tool that might be useful to some you. For others it might be a nice example. So you have your shiny Pharo server application running in the cloud. When something goes wrong, most of the time you will just restart, manually or automatically. But sometimes you wish you could interact with a running headless server image. Problem is, you can't out of the box. ZnReadEvalPrintDelegate is a simple tool that exports a REPL Web Service. Much like the emergency evaluator. Primitive but better than nothing. Install it on a port of your choice, running in a independent Zn HTTP server, bound to localhost only. ZnReadEvalPrintDelegate startInServerOn: 1701. There is only one API method: POST a plain/text Smalltalk expression to evaluate, get the result back. ZnClient new url: 'http://localhost:1701/repl'; contents: '42 factorial'; post. Here is an example terminal session (logged in to the server, not remote): A GET on the service /repl gives some help text $ curl http://localhost:1701/repl # Pharo Smalltalk REPL. POST expressions to evaluate # Here is one way (type ctrl-d to end input) curl -X POST -H'Content-Type:text/plain' --data-binary @- http://localhost:1701/repl A POST with -d is good for short expressions $ curl -X POST -H'Content-Type:text/plain' -d '42 factorial' http://localhost:1701/repl 1405006117752879898543142606244511569936384000000000 For longer or multi line expressions you can read input from stdin and end with ctrl-d (copy the expression returned by the GET). Or you could send text files. $ curl -X POST -H'Content-Type:text/plain' --data-binary @- http://localhost:1701/repl { (1 to: 10) sum. (1 to: 10) average } {55. (11/2)} There is error handling as well: $ curl -X POST -H'Content-Type:text/plain' --data-binary @- http://localhost:1701/repl 1 plus: 2 MessageNotUnderstood: SmallInteger>>plus: SmallInteger(Object)>>doesNotUnderstand: #plus: Receiver: 1 Arguments and temporary variables: aMessage: plus: 2 exception: MessageNotUnderstood: SmallInteger>>plus: resumeValue: nil Receiver's instance variables: 1 UndefinedObject>>DoIt Compiler>>evaluate:in:to:notifying:ifFail:logged: Compiler>>evaluate:in:to:notifying:ifFail: Compiler>>evaluate:in:to: ZnReadEvalPrintDelegate>>evaluate: in Block: [| result |... BlockClosure>>on:do: ZnReadEvalPrintDelegate>>evaluate: in Block: [:out | [| result |... String class(SequenceableCollection class)>>new:streamContents: WARNING: never open this service beyond your local network ! This service gives you absolute control over and access to everything in your image. For example, the following will kill your image: $ curl -X POST -H'Content-Type:text/plain' -d 'Smalltalk quitPrimitive' http://localhost:1701/repl All this in one class and a handful of methods. Enjoy, Sven PS1: Part of Zinc HTTP Components, in the bleedingEdge version. PS2: Of course, basic authentication or HTTPS can be added through simple Zn configuration. -- Sven Van Caekenberghe Proudly supporting Pharo http://pharo.org http://association.pharo.org http://consortium.pharo.org

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InputEventSensor and polling
by Eric Clack May 16, 2013

May 16, 2013

Hi all, I've been working on Phratch, a port of MIT Scratch to Pharo, mostly to learn Smalltalk and also because Scratch is a great learning environment and I can't bear to see it end up in Flash. So I've been digging about in the old code to fix bugs and I'm getting a sense that there's some conflict between the way the Scratch team got things working in Squeak, and the way the Pharo team things want things done. I must say I think the Pharo team have things right in their drive for a cleaner, simpler system, however that means I'm a bit stuck. See the attached image of my Scratch script. Here's where I am... 1. Keyboard events for 'When <key> pressed' HatBlockMorph (with then pen commands) work fine as these follow the regular Morphic event model 2. But 'if <key> pressed' operation (with the stamp command inside) doesn't work because it relies on polling the InputEventSensor, and I think this bit of this class doesn't work as I expect. My view right now is that for 2, I need to use some kind of polling, and InputEventSensor has methods such as keyboardPeek and peekKeyboardEvent that imply you can poll, but looking at the implementation, which uses WaitfreeQueue I can see that calling these methods results in events being consumed, hence my post to Stack Overflow... http://stackoverflow.com/questions/16395418/cant-peek-keyboard-events-multi… I've hacked around to come up with something that sort of works, outlined in this post: http://stackoverflow.com/questions/16495436/saving-modifications-to-existin… ...but I get the feeling I'm doing the wrong thing here, and that I should come up with a solution that better fits the 'Pharo way'. So, let me know what you think. I'm happy to provide more info and to research better solutions, let me know... Finally, apologies for the long post! Best regards, -Eric. -- Eric Clack ericclack(a)googlemail.com East Sussex, England.

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About the Mailinglist debacle...
by Marcus Denker May 16, 2013

May 16, 2013

Hello, So now that everything is workingâ¦ sorry for the mess. We should have left the gforge infrastructure the last time we had a multi-day problem, not wait till we get it again. I think this will be my new principle: second real problem -> I leave. No discussions. We already saw with the jenkins story just how deadly bad infrastructure is. So what happened was that last Tuesday, the lists (all lists of gforge) stopped delivering. Why is not clear, seemingly it was not gforge itself but the upstream servers did not deliver. Whatever. What is clear is that it was completely unclear how long this would take, and that we needed a solution after nearly a week of waiting. So we decided to move the lists. Of course with the old lists down, this was harder than normal (even involved parsing the html to get the subscribersâ¦) but that is not important. Now the problem its hat Mailman does not distinguish between people that unsubscribe, and those turning off delivery. So there where just a lot of people listed with "nomail (U)", What to do? It was clear that we can't just subscribe lots of people to a list that they *actively* unsubscribed. So the only option was to skip those by -> unsubscribing them from the old list -> then get the list of subscribers -> put that in the new list. The only people that will see a bad effect are those using e.g nabble to read the list. But those would see the new mails, too. The only problem they have is if the want to send. So not *that* of a big deal. It seems that we got quite some false positive subscribers anyway in the form of people who filtered the mails and then with the new list the filter did not work and they suddenly saw mails of a long forgotten list. We even had the case of people who where "nomail (U)", yet they did get mails delivered. How that can possibly work, I have no clue *at all*. What else is missing (and on my TODO since Sunday/Monday, sorry for not yet acting on it): -> lists.pharo.org has an empty page and needs to point to the list of the lists inttead -> the archive needs to be moved from the old jenkins. -> the (incomplete) archive of the new lists is not working since I put it as public. Soâ¦ maybe it would have been better to just wait until gforge works again and then moveâ¦ but it was just far too long already and not clear when it would be working again. Marcus

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a 'doesNotUnderstand' message that I do not understand...
by Alain Busser May 15, 2013

May 15, 2013

Hi all, Exploring the system browser (Pharo 2.0), I see that there exists a class called TextEditorDialogWindow; as this name sounds interesting to me, I want to test one, and I see that there is only one method in the category 'create': this method is called newTextEditorMorph. So, I send the message newTextEditorMorph to the class TextEditorDialogWindow, daring a: TextEditorDialogWindow newTextEditorMorph At the 'Do It', I get this error message: 'TextEditorDialogWindow class(Object) doesNotUnderstand: #newTextEditorMorph' That's what I don't understand: If the class has a method called this way, why does it not understand the corresponding message? What did I miss? Alain

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