- Pharo-users - lists.pharo.org

Re: [Pharo-users] Becoming proficient in Pharo

by stepharo

Le 13/1/15 15:13, nacho a Ã©crit : > 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. This would be reallllllly great > 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. Super! > 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 Esteban Lorenzano

you also need to register the object for cleanup, in the WeakRegistry. (not on my machine, sorry I cannot put an example, but look around) Esteban > On 13 Jan 2015, at 11:55, Johan Fabry <jfabry(a)dcc.uchile.cl> wrote: > > > 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] Useful tools?

by stepharo

We need a catalog of packages. We started to build such a catalog as a prototype. Now we are reimplementing everything. Stef Le 13/1/15 04:58, Laura Risani a Ã©crit : > Hi all, > > What are some tools / plug-ins/ projects / packages / frameworks > you find very useful or you use very frequently for development? > (please for each name it and state it's purpose) > I'm a newcomer to Pharo , so it hasn't to be something rare. > > > On the side... > I feel curious about how one gets to know about the existence of such > resources. Is there any sort of "resources index" (like a wiki page > with categories)? Besides books which can't be comprehensive because > of their nature. Such an index would be extremely handy in many ways. > Do you agree? Is it plausible, if it doesn't exist, to built it > collaboratively? > > It is a sad thing that useful tools go unnoticed when they could have > solved a problem you faced or eased your work if only you've known > about their existence. For what i've read on spread posts i feel like > there are many such tools. > > I had this experience of useful resource existence ignorance with > TilingWindowManager (LaurentLaffont) and with RBConfigurableFormatter > (by the way i can't figure out how to turn it on). Now i feel like > having a multiclipboard would be useful (i have one on my OS but > anyway...) > > Best, > Laura > > >

Jan. 13, 2015

Re: [Pharo-users] Useful tools?

by stepharo

> Two questions here: > > 1. The Configuration Browser is nice, but it still doesn't provide any > kind of description for the packages. I mean, looking at the list of > packages, I can probably guess what "Dependency Analyser" does, but I > have exactly zero chance in guessing what Epicea, Ephestos, Illiad, > Kendrick, Mandrill, Marina, Pastell, Pillar or Ston are about. Even a > single line description, displayed in a tooltip, would be a huge > improvement. Can this be added? Yes this is so true. You are 100% right this is why I started to code a catalog extracted from configurationOf. https://ci.inria.fr/pharo-contribution/job/PharoProjectCatalog/ but it seems that recent changes broke it. > 2. SmalltalkHub seems to have no way of browsing all available > packages. When I'm starting with Pharo and I don't know how some > library I need is called, I'm essentially out of luck: I need to do > much googling or ask on a mailing list, which both take more time than > it should. I see that " The following is a preview of the exploration > features of SmalltalkHub. More to come!" message is still there - I > remember it from a year or more back. Is this considered such a low > priority task, or is it just that nobody had enough time to work on > it? Yes you are again right. The person developing Smalltalkhub left and quit Smalltalk against all our expectations. > > By the way: there is no package description on many package pages. > Even squeaksource tended to have at least one sentence explaining the > purpose of a package (I think?). > >> There is a package named "Catalog", I don't know how many people is putting >> effort on it right now. I think it needs some love. >> > Ok, that's very nice, although the number of "Please project owner add > catalog description" and mention of "MetaRepoForPharo20" is a little > discouraging. Yes but if people do not see a value to document how can we do it. > One more question: besides asking on a mailing list, is there any > other way of learning about it? Is it linked from somewhere, or does > it need a lot of googling and luck (ie. googling for "pharo catalog > packages" doesn't return this link, at least on the first page of > results). right now this is just a experiment. Two years ago I asked inria to pay an engineer to help us solving this issue but they thought that with one engineer he can do everything. > > In general I have a feeling that discoverability of Pharo packages is > very bad right now. It's a serious problem for new users, and even to > a bit more advanced users who return to Pharo after some time of not > following announcements. I agree. >>> Now i feel like having a multiclipboard would be useful (i have one on my >>> OS but anyway...) >>> > There seems to be a support for this in Pharo 3.0: under right click > in an editor you have Paste and Paste... menu items. The latter > displays a thing that I think is supposed to be a list of recently > copied things. > > My problem, however, is that this doesn't work with OS clipboard (on > Linux). Ctrl+V and Right click->paste don't work at all with OS > clipboard (they do when copying things inside Pharo). X Window systems > have 2 clipboards: one normal and the other called "X selection" - it > seems that the latter is not checked at all, and normal clipboard is > being accessed by Clipboard>>clipboardText (when Alt+p on "Clipboard > default clipboardText"), but it still doesn't work with Ctrl+V. > Strange. > > Anyway, I have a very specific (side-)project in mind and I'm going to > try using Pharo for it, so you can expect quite a bit more questions > from me :) > > Best regards, > Piotr Klibert > >

Jan. 13, 2015

Re: [Pharo-users] Capturing a stream

by Ben Coman

So you mean 'rostopic echo' and 'rostopic pub' ? So its a publisher/subscriber model with 'echo' as the subscriber ? (I'll needs others to confirm this is possible but...) the way to go may be to fork 'rotopic echo' and leave it running, parsing its results into a queue that some other part of your program consumes. To simplify this to check feasibility, I'd start with a single shell script outputting text at intervals like this... "test.sh" for VARIABLE in 1 2 3 4 5 .. N do echo $VARIABLE sleep 2 done and in Pharo, assuming you can process the output stream asynchronously, every time you receive a newline, open an inspector showing the line just received. But sorry I don't know *PipeableOSProcess enough to know how.* *cheers -ben* On Tue, Jan 13, 2015 at 11:05 PM, Demian Schkolnik < demianschkolnik(a)gmail.com> wrote: > 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] 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