October 2010 - Pharo-users - lists.pharo.org

Re: [Pharo-users] Hard crash when teaching

by Igor Stasenko

On 8 October 2010 00:59, Johan Fabry <jfabry(a)dcc.uchile.cl> wrote: > > On 07 Oct 2010, at 17:04, Igor Stasenko wrote: > >> On 7 October 2010 23:39, Johan Fabry <jfabry(a)dcc.uchile.cl> wrote: >>> Always fun when you want to show the students that everything can be changed in Smalltalk ... >>> Inclusive the behavior of Integer>>+ >>> Inclusive when the current behavior does strange things with the second argument when it is not a number (instead of simply throwing an error), e.g what happens in 1 + 'foo' >>> Inclusive when you are debugging said expression. >>> >>> Apparantly that was too much to ask :-( Hard crash of the image :-( :-( >>> >>> Reported as issue http://code.google.com/p/pharo/issues/detail?id=3072 >>> >> its not very good idea to replace >> ^ aNumber adaptToInteger: self andSend: #+ >> >> with >> ^ self error: 'boo' >> >> because many parts of system relies on 'silent' type coercion. > > Well, I was not going to use the image for anything else after that ;-) > >> I didn't experienced the hard crash in pharo image. >> What i got instead, is an error, printed in emergency console >> >> saying that it unable to handle the system error .. > > Ok I guess that my concept of a hard crash is a bit softer than yours. > >> the culprit is in ImageMorph>>image: >> while somehow relying on correct behavior of Integer>>+ > > The question is why is laying out doing this with non-integers? Screens work with pixels so I did not expect that. You are right that I had to have thought about coercion of others, but I did not expect that to happen at that point... Next time I will be more careful ... > Its a good question why its there. But of course, i wouldn't never expect from system to keep working stable & normally, when you changing something as basic as Integer>>+. But there is a bright side: such things could be used to detect low-quality code (or code, which intentionally doing coercions ;)... For instance, i often type: 100/200 if you evaluate that, you'll get a Fraction as result: (1/2) but i want the answer to be Float, so i type: 100/200 asFloat and here, when you change the Integer>>#/ to throw error instead of coercing receiver, i won't be able to use it anymore, and will be forced to write: 100 asFloat / 200 asFloat > -- > Johan Fabry > jfabry(a)dcc.uchile.cl - http://dcc.uchile.cl/~jfabry > PLEIAD Lab - Computer Science Department (DCC) - University of Chile > > > > > _______________________________________________ > Pharo-users mailing list > Pharo-users(a)lists.gforge.inria.fr > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-users > -- Best regards, Igor Stasenko AKA sig.

Oct. 7, 2010

Re: [Pharo-users] Hard crash when teaching

by Johan Fabry

On 07 Oct 2010, at 17:04, Igor Stasenko wrote: > On 7 October 2010 23:39, Johan Fabry <jfabry(a)dcc.uchile.cl> wrote: >> Always fun when you want to show the students that everything can be changed in Smalltalk ... >> Inclusive the behavior of Integer>>+ >> Inclusive when the current behavior does strange things with the second argument when it is not a number (instead of simply throwing an error), e.g what happens in 1 + 'foo' >> Inclusive when you are debugging said expression. >> >> Apparantly that was too much to ask :-( Hard crash of the image :-( :-( >> >> Reported as issue http://code.google.com/p/pharo/issues/detail?id=3072 >> > its not very good idea to replace > ^ aNumber adaptToInteger: self andSend: #+ > > with > ^ self error: 'boo' > > because many parts of system relies on 'silent' type coercion. Well, I was not going to use the image for anything else after that ;-) > I didn't experienced the hard crash in pharo image. > What i got instead, is an error, printed in emergency console > > saying that it unable to handle the system error .. Ok I guess that my concept of a hard crash is a bit softer than yours. > the culprit is in ImageMorph>>image: > while somehow relying on correct behavior of Integer>>+ The question is why is laying out doing this with non-integers? Screens work with pixels so I did not expect that. You are right that I had to have thought about coercion of others, but I did not expect that to happen at that point... Next time I will be more careful ... -- Johan Fabry jfabry(a)dcc.uchile.cl - http://dcc.uchile.cl/~jfabry PLEIAD Lab - Computer Science Department (DCC) - University of Chile

Oct. 7, 2010

Re: [Pharo-users] Hard crash when teaching

by Igor Stasenko

On 7 October 2010 23:39, Johan Fabry <jfabry(a)dcc.uchile.cl> wrote: > Always fun when you want to show the students that everything can be changed in Smalltalk ... > Inclusive the behavior of Integer>>+ > Inclusive when the current behavior does strange things with the second argument when it is not a number (instead of simply throwing an error), e.g what happens in 1 + 'foo' > Inclusive when you are debugging said expression. > > Apparantly that was too much to ask :-( Hard crash of the image :-( :-( > > Reported as issue http://code.google.com/p/pharo/issues/detail?id=3072 > its not very good idea to replace ^ aNumber adaptToInteger: self andSend: #+ with ^ self error: 'boo' because many parts of system relies on 'silent' type coercion. I didn't experienced the hard crash in pharo image. What i got instead, is an error, printed in emergency console saying that it unable to handle the system error .. the culprit is in ImageMorph>>image: while somehow relying on correct behavior of Integer>>+ and ImageMorph obviously used by Morphic rendering. So, its not crashing. Image is still responsible. You just broken UI with it: a toolbuilder, when creating a new Error popup window, also creates and initializing an ImageMorph as a submorph. And since it fails with error, the error-handling layer treats this as failure to handle error and thus, it switching to emergency console. Btw, there was a good chances, that even an emergency console could be broken because of such change. > -- > Johan Fabry > jfabry(a)dcc.uchile.cl - http://dcc.uchile.cl/~jfabry > PLEIAD Lab - Computer Science Department (DCC) - University of Chile > > > > > _______________________________________________ > Pharo-users mailing list > Pharo-users(a)lists.gforge.inria.fr > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-users > -- Best regards, Igor Stasenko AKA sig.

Oct. 7, 2010

could not search contents at http://book.pharo-project.org

by Bernardo Ezequiel Contreras

Hi All, Description: Could not search contents at http://book.pharo-project.org. I would like to search some expression in the contents of the book. Steps to reproduce: * goto to http://book.pharo-project.org * click on main image * add any string on search contents and press Enter Actual Result: Seaside Walkback Error: subscript is out of bounds: 8218Expected Result: a list of results that matches your input string Thanks,

Oct. 7, 2010

Hard crash when teaching

by Johan Fabry

Always fun when you want to show the students that everything can be changed in Smalltalk ... Inclusive the behavior of Integer>>+ Inclusive when the current behavior does strange things with the second argument when it is not a number (instead of simply throwing an error), e.g what happens in 1 + 'foo' Inclusive when you are debugging said expression. Apparantly that was too much to ask :-( Hard crash of the image :-( :-( Reported as issue http://code.google.com/p/pharo/issues/detail?id=3072 -- Johan Fabry jfabry(a)dcc.uchile.cl - http://dcc.uchile.cl/~jfabry PLEIAD Lab - Computer Science Department (DCC) - University of Chile

Oct. 7, 2010

Re: [Pharo-users] where do you report a bug on http://book.pharo-project.org?

by StÃ©phane Ducasse

here. > Hi All, > > Where could i report a bug on http://book.pharo-project.org? > > Thanks > _______________________________________________ > Pharo-users mailing list > Pharo-users(a)lists.gforge.inria.fr > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-users

Oct. 7, 2010

where do you report a bug on http://book.pharo-project.org?

by Bernardo Ezequiel Contreras

Hi All, Where could i report a bug on http://book.pharo-project.org? Thanks

Oct. 7, 2010

Re: [Pharo-users] I'm trying to call markdown as an external process

by David T. Lewis

Hi Pat, I'm not familiar with Markdown, but it sounds like you want to run an external process (Markdown), write to its standard input from Smalltalk, and read its standard input back into Smalltalk. Try using class PipeableOSProcess for this. There are some examples in the class side methods that show how it works. PipeableOSProcess works at a higher level than the classes in OSProcess, and it will handle the issues of connecting the external process to your image through pipes. Be careful about reading the output from your external Markdown process. Pipes by default work in blocking mode, see #setNonblocking to change this. If you do a read on the output of a blocking pipe, and if there is no data available, your VM will block and your image will be locked up. So save your image frequently until you get the details worked out ;) HTH, Dave On Thu, Oct 07, 2010 at 01:00:24AM +0200, Mariano Martinez Peck wrote: > David may help you. > > Cheers > > Mariano > > On Wed, Oct 6, 2010 at 2:27 AM, Pat Maddox <patmaddox(a)me.com> wrote: > > > On Oct 5, 2010, at 5:05 PM, Pat Maddox wrote: > > > > > I'm trying to do something which (I think) is very simple: I just want to > > run a line of text through Markdown and get the output. > > > > > > I've spent all day reading through the code for OSProcess and > > CommandShell. It took me a while, but I finally figured out I can run a > > command and get its output with: > > > > > > UnixProcess waitForCommandOutput: 'ls ~' > > > > > > The next problem I'm having is getting markdown to run on an arbitrary > > string. If I go into my shell and do: > > > > > > $ /usr/local/bin/markdown <<END > > >> # This is a heading > > >> This is a paragraph with _emphasis_ > > >> END > > > <h1>This is a heading</h1> > > > > > > Then I get the output that I expect: > > > <p>This is a paragraph with <em>emphasis</em></p> > > > > > > I can't figure out how to do this with OSProcess though. I've tried: > > > > > > UnixProcess waitForCommand: ('/usr/local/bin/markdown <<END > > > hello world > > > END') > > > > > > but with no luck. I've also tried using OSProcess at a lower level, > > setting up the stream input object, but it seems to require a reference to > > an actual file, rather than just a stream. > > > > > > Anyone have any ideas? I want to take an arbitrary string and use that > > as the input to my markdown command, and then store that output in an > > instance variable. I could use some help. > > > > > > Thanks, > > > Pat > > > > Okay I've got something which appears to work fine. > > > > (OSProcess thisOSProcess command: '/usr/local/bin/markdown' input: '#this > > is a heading > > this is a paragraph _with emphasis_') output > > > > Kind of a painful day, but glad to be moving on :) > > > > Pat > > > > _______________________________________________ > > Pharo-users mailing list > > Pharo-users(a)lists.gforge.inria.fr > > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-users > >

Oct. 7, 2010

Re: [Pharo-users] [Pharo-project] Pharo Talk ESUG 2010

by GermÃ¡n Arduino

Thanks. See you here here in November :) 2010/10/7 Marcus Denker <marcus.denker(a)inria.fr>: > > On Oct 7, 2010, at 1:23 AM, GermÃ¡n Arduino wrote: > >> hehe, thanks! >> >> You will come to Smalltalks 2010 ? > > Yes, Mariano, Luc and me. > >> >> I was thinking exactly in ask permit to use this one (and other >> similars) to present Pharo in other contexts, for example in localgroups, etc. > > Normally all my talks are CC non-commercial share-alike... only that I often forget to put > it in the slides... > >> That's perfectly allowed and even more, a ppt/keypoint template should be available. 2 days ago Marcus borrowed this one for my PhD first year evaliuation ;) > > > Ok, I have put the keynote (zipped): > > Â Â Â Â http://marcusdenker.de/talks/10ESUG/ > > -- > Marcus Denker Â -- http://www.marcusdenker.de > INRIA Lille -- Nord Europe. Team RMoD. > > > _______________________________________________ > Pharo-users mailing list > Pharo-users(a)lists.gforge.inria.fr > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-users >

Oct. 7, 2010

Re: [Pharo-users] [Pharo-project] Pharo Talk ESUG 2010

by Marcus Denker

On Oct 7, 2010, at 1:23 AM, GermÃ¡n Arduino wrote: > hehe, thanks! > > You will come to Smalltalks 2010 ? Yes, Mariano, Luc and me. > > I was thinking exactly in ask permit to use this one (and other > similars) to present Pharo in other contexts, for example in localgroups, etc. Normally all my talks are CC non-commercial share-alike... only that I often forget to put it in the slides... > That's perfectly allowed and even more, a ppt/keypoint template should be available. 2 days ago Marcus borrowed this one for my PhD first year evaliuation ;) Ok, I have put the keynote (zipped): http://marcusdenker.de/talks/10ESUG/ -- Marcus Denker -- http://www.marcusdenker.de INRIA Lille -- Nord Europe. Team RMoD.

Oct. 7, 2010