January 2015 - Pharo-users - lists.pharo.org

Re: [Pharo-users] Becoming proficient in Pharo

by Ben Coman

good idea. Now something I recommend you become practiced at.... Pick some system function, e.g. <Add package...> in the System Browser, bring up the halos on it and <Inspect Morph> from the debug halo icon. Look for a likely selector and put a HALT in that method. Then invoke the menu item and trace through the system with the debugger. You can learn a lot of magic from seeing how things work under the covers. Also, try checking Fogbugz for cases marked "Resolved (Fix Review Needed)" or "Resolved (Fix Reviewed by the Monkey)". Someone already did the hard work adding some feature or bug fix. You can learn A LOT from seeing what they've done. Again, put HALTs in some of the changed methods and trace through that code. cheers -ben On Tue, Jan 13, 2015 at 10:47 PM, sergio_101 <sergio.rrd(a)gmail.com> wrote: > i really like that idea, but it seems like with someone as huge as a > programming language, it might be best to reign it in a little. when people > come to me asking for advice on learning a new language/ecosystem, i always > have them come up with a small (but non trivial) problem to solve using > that language. > > the act of building something small and non trivial usually brings you > head on with most of this concepts you are going to want to figure out > pretty quickly.. > > but i do think this is a good idea.. > > On Tue Jan 13 2015 at 9:20:05 AM kilon alios <kilon.alios(a)gmail.com> > wrote: > >> very good idea indeed. I try to do something similar with my video >> tutorial, my aim is to help beginners go beyond the basic of pharo. I find >> creating video tutorial much easier and more fun than writing stuff down. >> But yes we can do so much more in the area as well. >> >> On Tue, Jan 13, 2015 at 4:13 PM, nacho <0800nacho(a)gmail.com> wrote: >> >>> Hello, >>> As I struggle, not without fun of course, to learn more about Pharo and >>> its >>> frameworks and idea came to my mind. >>> We could put together some guidelines on how to become proficient in >>> Pharo, >>> and eventually come to be a power user and / or a developer. >>> I read several of this recommendations on various list of other >>> programming >>> languages. >>> Basically the idea is to have some sort of guide, with theoretical and >>> practical stuff. >>> For example: >>> *Beginners.* >>> Start by reading Pharo by Example for getting to know the system. >>> On Agile development read XXXX book or article. >>> On Object Oriented design and programming read this or that. >>> For practice do this exercises from this book or site. >>> For a background on Smalltalk read here or there >>> Some stuff on algorithms. >>> >>> *Intermediate* >>> Object Serialization read from here. >>> The VM from here.. >>> Building UIs >>> Basic Frameworks >>> Deep into Pharo >>> Pharo for the Enterprise >>> etc, etc, etc >>> >>> *Advanced* >>> etc, etc, etc >>> >>> Like a road map to becoming a serious Pharo users and / or developer. I >>> know >>> this takes years but I think it would be very useful. Well at least for >>> me. >>> I sometimes get lost when I read things like serializing, marshalling, >>> object memory, not to mention the internals of Pharo. >>> >>> Here is a link of something someone prepared for Haskell: >>> http://stackoverflow.com/questions/1012573/getting-started-with-haskell >>> <http://stackoverflow.com/questions/1012573/getting-started-with-haskell >>> > >>> >>> Just an idea, it will be collaborative. I volunteer to keep and maintain >>> the >>> list updated in a place where it will be available to anyone but of >>> course >>> can't contribute much besides doing that. >>> Cheers >>> Nacho >>> >>> >>> >>> >>> ----- >>> Nacho >>> Smalltalker apprentice. >>> Buenos Aires, Argentina. >>> -- >>> View this message in context: >>> http://forum.world.st/Becoming-proficient-in-Pharo-tp4799284.html >>> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >>> >>> >>

Jan. 13, 2015

Re: [Pharo-users] Notification on GC of an object?

by ClÃ©ment Bera

Yeah Object>>#finalize is supposed to do what you said but unfortunately it does not work... Maybe it's a VM bug or maybe it's not supported any more. We'll see if Eliot answer the thread. 2015-01-13 15:55 GMT+01:00 Johan Fabry <jfabry(a)dcc.uchile.cl>: > > No, just putting the cleanup code in a finalize method does not seem to be > working, sadly. > > > On Jan 13, 2015, at 11:18, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > > > > Object>>#finalize ? > > > >> On 13 Jan 2015, at 15:13, Johan Fabry <jfabry(a)dcc.uchile.cl> wrote: > >> > >> Hi all, > >> > >> does anybody here have experience with hooking into the GC mechanism so > that an object gets notified when it is collected? I have a setup here with > auto generated classes that I would like to remove when their unique > instance disappears. So Iâd like to let the GC figure out all the > complicated tracking and inform me whenever such an object is collected, > then Iâll zap the class as well. > >> > >> Experience reports, hints and tips are most welcome! > >> > >> ---> Save our in-boxes! http://emailcharter.org <--- > >> > >> Johan Fabry - http://pleiad.cl/~jfabry > >> PLEIAD lab - Computer Science Department (DCC) - University of Chile > >> > >> > > > > > > > > > > ---> Save our in-boxes! http://emailcharter.org <--- > > Johan Fabry - http://pleiad.cl/~jfabry > PLEIAD lab - Computer Science Department (DCC) - University of Chile > > >

Jan. 13, 2015

Re: [Pharo-users] Capturing a stream

by Demian Schkolnik

It is actually not a native linux command, but rather something belonging to ROS (Robot Robot Operating System). I did not want to complicate the question further.. The behaviour is as I described it. This echo command sits still in the console where it was called, and waits. When some message is send, then it just prints the message on screen and waits. The pub method (also belonging to ROS) publishes a message and exits. I tried Ben's solution (thanks!), but unfortunately stringVar remains nil. I think the problem is we are assigning the output of the command to stringVar, which is nothing, at the moment. Any ideas? Thank you all. El Tue Jan 13 2015 at 6:15:01, Ben Coman <btc(a)openinworld.com> escribiÃ³: > I've never known 'echo' to wait for input, and haven't heard of this echo > & pub combination. Do you have some link to a tutorial showing how they > are used? > > However just wildly guessing, are you wanting to get output from a long > running command without blocking the Pharo UI? > In that case, what about... > [ *stringVar := (PipeableOSProcess command: 'echo...') output ] > fork. * > *?* > *cheers -ben* > > On Tue, Jan 13, 2015 at 9:18 AM, Demian Schkolnik < > demianschkolnik(a)gmail.com> wrote: > >> Hello everyone. >> >> I have the following question. I have a specific 'echo ...' command, >> which I send to the linux console via " OSProcess command:'echo ... ' ". >> This echo command, when executed on the native linux console, stands by >> until it receives some message. >> Following this, I have to execute a 'pub...' command, which gives some >> information that the echo command will print on screen. On linux, you run >> 'echo..' on a terminal and 'pub...' on another. >> My objective here is to capture the output of echo into a smalltalk >> variable for later use. >> Normally, if a console command prints something immediately to screen, I >> use >> *(PipeableOSProcess command:'some command') output.* >> >> It is here a little different though, since this command will not print >> something immediately to screen. I want to do something like this, where >> the final output of 'echo..' stays in stringVar. >> >> *stringVar := (PipeableOSProcess command: 'echo...') output. * >> *(Delay forSeconds:3) wait.* >> *(OSProcess command: 'pub... ').* >> *(Delay forSeconds:3) wait.* >> >> Thank you all. >> >> >> >> >

Jan. 13, 2015

Re: [Pharo-users] Notification on GC of an object?

by Johan Fabry

No, just putting the cleanup code in a finalize method does not seem to be working, sadly. > On Jan 13, 2015, at 11:18, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > > Object>>#finalize ? > >> On 13 Jan 2015, at 15:13, Johan Fabry <jfabry(a)dcc.uchile.cl> wrote: >> >> Hi all, >> >> does anybody here have experience with hooking into the GC mechanism so that an object gets notified when it is collected? I have a setup here with auto generated classes that I would like to remove when their unique instance disappears. So Iâd like to let the GC figure out all the complicated tracking and inform me whenever such an object is collected, then Iâll zap the class as well. >> >> Experience reports, hints and tips are most welcome! >> >> ---> Save our in-boxes! http://emailcharter.org <--- >> >> Johan Fabry - http://pleiad.cl/~jfabry >> PLEIAD lab - Computer Science Department (DCC) - University of Chile >> >> > > > ---> Save our in-boxes! http://emailcharter.org <--- Johan Fabry - http://pleiad.cl/~jfabry PLEIAD lab - Computer Science Department (DCC) - University of Chile

Jan. 13, 2015

Re: [Pharo-users] Becoming proficient in Pharo

by sergio_101

i really like that idea, but it seems like with someone as huge as a programming language, it might be best to reign it in a little. when people come to me asking for advice on learning a new language/ecosystem, i always have them come up with a small (but non trivial) problem to solve using that language. the act of building something small and non trivial usually brings you head on with most of this concepts you are going to want to figure out pretty quickly.. but i do think this is a good idea.. On Tue Jan 13 2015 at 9:20:05 AM kilon alios <kilon.alios(a)gmail.com> wrote: > very good idea indeed. I try to do something similar with my video > tutorial, my aim is to help beginners go beyond the basic of pharo. I find > creating video tutorial much easier and more fun than writing stuff down. > But yes we can do so much more in the area as well. > > On Tue, Jan 13, 2015 at 4:13 PM, nacho <0800nacho(a)gmail.com> wrote: > >> Hello, >> As I struggle, not without fun of course, to learn more about Pharo and >> its >> frameworks and idea came to my mind. >> We could put together some guidelines on how to become proficient in >> Pharo, >> and eventually come to be a power user and / or a developer. >> I read several of this recommendations on various list of other >> programming >> languages. >> Basically the idea is to have some sort of guide, with theoretical and >> practical stuff. >> For example: >> *Beginners.* >> Start by reading Pharo by Example for getting to know the system. >> On Agile development read XXXX book or article. >> On Object Oriented design and programming read this or that. >> For practice do this exercises from this book or site. >> For a background on Smalltalk read here or there >> Some stuff on algorithms. >> >> *Intermediate* >> Object Serialization read from here. >> The VM from here.. >> Building UIs >> Basic Frameworks >> Deep into Pharo >> Pharo for the Enterprise >> etc, etc, etc >> >> *Advanced* >> etc, etc, etc >> >> Like a road map to becoming a serious Pharo users and / or developer. I >> know >> this takes years but I think it would be very useful. Well at least for >> me. >> I sometimes get lost when I read things like serializing, marshalling, >> object memory, not to mention the internals of Pharo. >> >> Here is a link of something someone prepared for Haskell: >> http://stackoverflow.com/questions/1012573/getting-started-with-haskell >> <http://stackoverflow.com/questions/1012573/getting-started-with-haskell> >> >> Just an idea, it will be collaborative. I volunteer to keep and maintain >> the >> list updated in a place where it will be available to anyone but of course >> can't contribute much besides doing that. >> Cheers >> Nacho >> >> >> >> >> ----- >> Nacho >> Smalltalker apprentice. >> Buenos Aires, Argentina. >> -- >> View this message in context: >> http://forum.world.st/Becoming-proficient-in-Pharo-tp4799284.html >> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >> >> >

Jan. 13, 2015

Re: [Pharo-users] Becoming proficient in Pharo

by kilon alios

very good idea indeed. I try to do something similar with my video tutorial, my aim is to help beginners go beyond the basic of pharo. I find creating video tutorial much easier and more fun than writing stuff down. But yes we can do so much more in the area as well. On Tue, Jan 13, 2015 at 4:13 PM, nacho <0800nacho(a)gmail.com> wrote: > Hello, > As I struggle, not without fun of course, to learn more about Pharo and its > frameworks and idea came to my mind. > We could put together some guidelines on how to become proficient in Pharo, > and eventually come to be a power user and / or a developer. > I read several of this recommendations on various list of other programming > languages. > Basically the idea is to have some sort of guide, with theoretical and > practical stuff. > For example: > *Beginners.* > Start by reading Pharo by Example for getting to know the system. > On Agile development read XXXX book or article. > On Object Oriented design and programming read this or that. > For practice do this exercises from this book or site. > For a background on Smalltalk read here or there > Some stuff on algorithms. > > *Intermediate* > Object Serialization read from here. > The VM from here.. > Building UIs > Basic Frameworks > Deep into Pharo > Pharo for the Enterprise > etc, etc, etc > > *Advanced* > etc, etc, etc > > Like a road map to becoming a serious Pharo users and / or developer. I > know > this takes years but I think it would be very useful. Well at least for me. > I sometimes get lost when I read things like serializing, marshalling, > object memory, not to mention the internals of Pharo. > > Here is a link of something someone prepared for Haskell: > http://stackoverflow.com/questions/1012573/getting-started-with-haskell > <http://stackoverflow.com/questions/1012573/getting-started-with-haskell> > > Just an idea, it will be collaborative. I volunteer to keep and maintain > the > list updated in a place where it will be available to anyone but of course > can't contribute much besides doing that. > Cheers > Nacho > > > > > ----- > Nacho > Smalltalker apprentice. > Buenos Aires, Argentina. > -- > View this message in context: > http://forum.world.st/Becoming-proficient-in-Pharo-tp4799284.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >

Jan. 13, 2015

Re: [Pharo-users] Notification on GC of an object?

by Sven Van Caekenberghe

Object>>#finalize ? > On 13 Jan 2015, at 15:13, Johan Fabry <jfabry(a)dcc.uchile.cl> wrote: > > Hi all, > > does anybody here have experience with hooking into the GC mechanism so that an object gets notified when it is collected? I have a setup here with auto generated classes that I would like to remove when their unique instance disappears. So Iâd like to let the GC figure out all the complicated tracking and inform me whenever such an object is collected, then Iâll zap the class as well. > > Experience reports, hints and tips are most welcome! > > ---> Save our in-boxes! http://emailcharter.org <--- > > Johan Fabry - http://pleiad.cl/~jfabry > PLEIAD lab - Computer Science Department (DCC) - University of Chile > >

Jan. 13, 2015

Becoming proficient in Pharo

by nacho

Hello, As I struggle, not without fun of course, to learn more about Pharo and its frameworks and idea came to my mind. We could put together some guidelines on how to become proficient in Pharo, and eventually come to be a power user and / or a developer. I read several of this recommendations on various list of other programming languages. Basically the idea is to have some sort of guide, with theoretical and practical stuff. For example: *Beginners.* Start by reading Pharo by Example for getting to know the system. On Agile development read XXXX book or article. On Object Oriented design and programming read this or that. For practice do this exercises from this book or site. For a background on Smalltalk read here or there Some stuff on algorithms. *Intermediate* Object Serialization read from here. The VM from here.. Building UIs Basic Frameworks Deep into Pharo Pharo for the Enterprise etc, etc, etc *Advanced* etc, etc, etc Like a road map to becoming a serious Pharo users and / or developer. I know this takes years but I think it would be very useful. Well at least for me. I sometimes get lost when I read things like serializing, marshalling, object memory, not to mention the internals of Pharo. Here is a link of something someone prepared for Haskell: http://stackoverflow.com/questions/1012573/getting-started-with-haskell <http://stackoverflow.com/questions/1012573/getting-started-with-haskell> Just an idea, it will be collaborative. I volunteer to keep and maintain the list updated in a place where it will be available to anyone but of course can't contribute much besides doing that. Cheers Nacho ----- Nacho Smalltalker apprentice. Buenos Aires, Argentina. -- View this message in context: http://forum.world.st/Becoming-proficient-in-Pharo-tp4799284.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Jan. 13, 2015

Notification on GC of an object?

by Johan Fabry

Hi all, does anybody here have experience with hooking into the GC mechanism so that an object gets notified when it is collected? I have a setup here with auto generated classes that I would like to remove when their unique instance disappears. So Iâd like to let the GC figure out all the complicated tracking and inform me whenever such an object is collected, then Iâll zap the class as well. Experience reports, hints and tips are most welcome! ---> Save our in-boxes! http://emailcharter.org <--- Johan Fabry - http://pleiad.cl/~jfabry PLEIAD lab - Computer Science Department (DCC) - University of Chile

Jan. 13, 2015

Object select or create methods

by sergio_101

During my daily work in another framework, we are able to do something very handy like so: myThing := Thing findOrCreateByKey: 'red_thing'. where the key is some underscored all lower case unique name for an object we will be calling all the time. this will return either a new thing with a key of 'red_thing' or the current one that already exists. We can also do something like: myThing updateWithDictionary: aDictionary. and it will flip through the dictionary and assign values to the instance variables. The above is very handy. I am currently creating a bunch of methods that populate my image with real objects, and could use these methods. My question is. Does a behavior like this already exist? If not, I'd like to add these methods to my project (in monticello). They will be used with several different objects, so should I add the methods to Object? I would imagine this is something I would want to use a great deal. How would I go aobut making this something I could include easily in further projects? I realize that the 'updateWithDictionary' is very inefficient, but this will just be somethign that runs once, during data import, and never again. I just want to make sure I am not doing anything whacky. Thanks!

Jan. 13, 2015