October 2017 - Pharo-users - lists.pharo.org

Re: [Pharo-users] Can't find Cairo

by Peter UhnÃ¡k

Make sure you have the same image and lib version (64bit vs 32bit). The paths where Pharo looks are described in CairoLibrary class. CairoLibrary>>unix32ModuleName "On different flavors of linux the path to library may differ depending on OS distro or whether system is 32 or 64 bit. Packages such as snapcraft can also change the path. Look in a number of known locations, or LD_LIBRARY_PATH." (#('/usr/lib/i386-linux-gnu' '/usr/lib32' '/usr/lib'), (((OSEnvironment current getEnv: 'LD_LIBRARY_PATH') ifNil: [ '' ]) substrings: ':')) do: [ :path | | libraryPath | libraryPath := path asFileReference / 'libcairo.so.2'. libraryPath exists ifTrue: [ ^ libraryPath fullName ] ]. self error: 'Cannot locate cairo library. Please check if it installed on your system' CairoLibrary>>unix64ModuleName "On different flavors of linux the path to library may differ depending on OS distro or whether system is 32 or 64 bit. Packages such as snapcraft can also change the path. Look in a number of known locations, or LD_LIBRARY_PATH." (#('/lib/x86_64-linux-gnu' '/usr/lib'), (((OSEnvironment current getEnv: 'LD_LIBRARY_PATH') ifNil: [ '' ]) substrings: ':')) do: [ :path | | libraryPath | libraryPath := path asFileReference / 'libcairo.so.2'. libraryPath exists ifTrue: [ ^ libraryPath fullName ] ]. self error: 'Cannot locate cairo library. Please check if it installed on your system' Cheers, Peter On Sun, Oct 8, 2017 at 6:34 PM, Steven R. Baker <steven(a)stevenrbaker.com> wrote: > Heya, > > I need some help telling Pharo where to find things. I've installed Bloc > into my image, and it can't find cairo. Cairo is installed, but as far > as I can tell Bloc is not looking for it in /usr/lib/x86_64-linux-gnu/ > which is where it can be found. > > I don't care to go making symlinks around my system: is there a sensible > way to tell Pharo where to find libcairo? > > Thanks! > > -Steven > > > >

Oct. 8, 2017

Re: [Pharo-users] How to make pharo find sqlite?

by phil＠highoctane.be

Oh my, am doing too much Windows at the moment. Phil On Sat, Oct 7, 2017 at 11:47 PM, Alistair Grant <akgrant0710(a)gmail.com> wrote: > On Sat, Sep 30, 2017 at 01:28:06PM +0200, Herby Voj????k wrote: > > phil(a)highoctane.be wrote: > > >What about > > > > > >LD_LIBRARY_PATH=<sqlite3place>;$LD_LIBRARYPATH ./pharo-ui some.image > > > > > >Phil > > > > Thanks for answer, did not help. > > > > In fact it must be something different. As can be seen in the stack, it > > fails during finalizers, and as can be seen by looking at > > UDBCSQLite3DatabaseExternalObject class>>finalizeResourceData: code, the > > method it calls is sqlite close. It is hardly the first method that is > > should call... > > > > I suspect something around image save / load. Again. Lots of errors in > those > > parts. But may be something else, as it kicks in only when SQLite-using > > tests starts to run. :-( > > > > Herby > > > > P.S.: I saw there is a similar thread out there, but it has problems with > > 32bit loaded by 64bit vm; but here, I have 32bit linux, so the vm > installed > > should be 32bit. > > > Sorry I'm a bit late to the party... > > I'm using Glorp / UDBCSQLite3 on Ubuntu 16.04 without any problems > (admittedly 64 bit Ubuntu, but as you say, that shouldn't matter). > > Just in case you copy-and-pasted the code, Phil's example has a typo: > the path separator is a colon (:), not semicolon (;). > > Install libsqlite3-dev and adding /usr/lib/i386-linux-gnu to > LD_LIBRARY_PATH is all I had to do to get it to work (no changes to > UDBCSQLite3Library>>library). Actually LD_LIBRARY_PATH normally > shouldn't be required, but I'm running inside a snap container, which is > an unusual environment. > > > > > root@32bit-agent:~# find / -name '*libsqlite*' -type f > 2>>/dev/null > > /usr/lib/i386-linux-gnu/libsqlite3.so.0.8.6 > > It seems strange that there isn't libsqlite3.so. I think the real > solution would be to find out why libsqlite3.so doesn't exist, but after > installing libsqlite3-dev, a workaround would be to try creating a > symbolic link from libsqlite3.so.0.8.6 to libsqlite3.so. > > > > Cheers, > Alistair > > >

Oct. 8, 2017

Re: [Pharo-users] FileReference#entries caching?

by Alistair Grant

On Sun, Oct 08, 2017 at 06:33:08PM +0200, Guillermo Polito wrote: > Hi, > > I don't think that FileSystem is caching entries... I haven't seen any code in the Pharo image or FilePlugin that caches data. > However, we found somehow > related bug the other day with Mariano and Pablo while running OSSupprocess > tests on travis/linux. The bug is as follows. The test was doing: > > '/tmp' asFileReference entries do: [...] > > And then it was calling 'lsof' over pharo's pid to know files that pharo has > open. > > funny thing is that lsof was telling us that '/tmp' was open! When we already > retrieved the entries and the file reference was collected... > > The same in osx or local linux mate running in a virtual box did not happen :/. I was able to reproduce the issue on Ubuntu 16.04 using Pharo7.0-32bit-d13eed2.image. I haven't tracked the cause down, but the problem doesn't exist with the proposed fix I have for symbolic links (fogbugz 18279 https://pharo.fogbugz.com/f/cases/18279/isSymlink-seems-to-be-broken-on-Lin…) This patch also updates the code responsible for iterating over directories, which is why it can resolve this issue as well. Cheers, Alistair > On Sat, Oct 7, 2017 at 5:44 PM, Steven R. Baker <steven(a)stevenrbaker.com> > wrote: > > > > > On 07/10/17 14:22, Peter Uhn?k wrote: > > On Sat, Oct 7, 2017 at 1:02 PM, Steven R. Baker < > steven(a)stevenrbaker.com> wrote: > > Is it cached or something? How do I guarantee that I'm *definitely* > getting the current state of the directory on disk? > > > This looks extremely strange, I've never seen that inspecting files/ > directories would be somehow "out of sync" with the disk, because it is > always asking the disk. > > > > > Should I not even be using FileReference for this? > > > If you are loading png icons into Pharo, you can consider using https:/ > /github.com/peteruhnak/IconFactory/ instead (shameless self promotion > :) ) > > > Will definitely switch to this; I wasn't aware of the pattern, but > obviously I want to follow them where possible. :) > > > Peter > > > > > > > -- > [presentation] Guille Polito > [CNRS-filaire] > Research Engineer > > Centre de Recherche en Informatique, Signal et > Automatique de Lille > > CRIStAL - UMR 9189 > > French National Center for Scientific Research - > http://www.cnrs.fr > > > Web: http://guillep.github.io > > Phone: +33 06 52 70 66 13 >

Oct. 8, 2017

Re: [Pharo-users] Futures, in Scale (was: Re: Embeddable Smalltalk (was: Re: Behold Pharo: The Modern Smalltalk))

by Guillermo Polito

Hi Herby, Scale does not implement futures by itself. It uses the ones implemented in taskit: https://github.com/sbragagnolo/taskit On Sat, Oct 7, 2017 at 2:22 PM, Herby VojÄÃk <herby(a)mailbox.sk> wrote: > Hi, > > I have looked at Scale b/c of different question, and I see it uses > futures. > > I'd like to ask if those futures are one-off, or is there any consensus on > how futures should look like in Pharo. The reason I ask is b/c Amber > already has something like that - Promises, which do not use the native JS > API directly (though it is inspired), but do have an API of their own; and > since those concepts seems to be similar (or maybe are the same, just > called differently), if the API used shouldn't be sort-of standardized / > used the same way in all occasions. > > Herby > > P.S.: Including state-of-the-art Promises.st from Amber master branch to > get a picture: > > Smalltalk createPackage: 'Kernel-Promises'! > Object subclass: #Promise > instanceVariableNames: '' > package: 'Kernel-Promises'! > > !Promise class methodsFor: 'composites'! > > all: aCollection > "Returns a Promise resolved with results of sub-promises." > <inlineJS: 'return Promise.all($recv(aCollection)._asArray())'> > ! > > any: aCollection > "Returns a Promise resolved with first result of sub-promises." > <inlineJS: 'return Promise.race($recv(aCollection)._asArray())'> > ! ! > > !Promise class methodsFor: 'instance creation'! > > forBlock: aBlock > "Returns a Promise that is resolved with the value of aBlock, > and rejected if error happens while evaluating aBlock." > ^ self new then: aBlock > ! > > new > "Returns a dumb Promise resolved with nil." > <inlineJS: 'return Promise.resolve()'> > ! > > new: aBlock > "Returns a Promise that is eventually resolved or rejected. > Pass a block that is called with one argument, model. > You should call model value: ... to resolve the promise > and model signal: ... to reject the promise. > If error happens during run of the block, > promise is rejected with that error as well." > <inlineJS: 'return new Promise(function (resolve, reject) { > var model = {value: resolve, signal: reject}; > aBlock._value_(model); > })'> > ! > > signal: anObject > "Returns a Promise rejected with anObject." > <inlineJS: 'return $recv(anObject)._in_(function (x) {return > Promise.reject(x)})'> > ! > > value: anObject > "Returns a Promise resolved with anObject." > <inlineJS: 'return $recv(anObject)._in_(function (x) {return > Promise.resolve(x)})'> > ! ! > > Trait named: #TThenable > package: 'Kernel-Promises'! > > !TThenable methodsFor: 'promises'! > > catch: aBlock > <inlineJS: 'return self.then(null, function (err) {return > $core.seamless(function () { > return aBlock._value_(err); > })})'> > ! > > on: aClass do: aBlock > <inlineJS: 'return self.then(null, function (err) {return > $core.seamless(function () { > if (err._isKindOf_(aClass)) return aBlock._value_(err); > else throw err; > })})'> > ! > > on: aClass do: aBlock catch: anotherBlock > ^ (self on: aClass do: aBlock) catch: anotherBlock > ! > > then: aBlockOrArray > "Accepts a block or array of blocks. > Each of blocks in the array or the singleton one is > used in .then call to a promise, to accept a result > and transform it to the result for the next one. > In case a block has more than one argument > and result is an array, first n-1 elements of the array > are put into additional arguments beyond the first. > The first argument always contains the result as-is." > <inlineJS: ' > var array = Array.isArray(aBlockOrArray) ? aBlockOrArray : [aBlockOrArray]; > return array.reduce(function (soFar, aBlock) { > return soFar.then(typeof aBlock === "function" && aBlock.length > 1 ? > function (result) {return $core.seamless(function () { > if (Array.isArray(result)) { > return aBlock._valueWithPossibleArgum > ents_([result].concat(result.slice(0, aBlock.length-1))); > } else { > return aBlock._value_(result); > } > })} : > function (result) {return $core.seamless(function () { > return aBlock._value_(result); > })} > ); > }, self)'> > ! > > then: aBlockOrArray catch: anotherBlock > ^ (self then: aBlockOrArray) catch: anotherBlock > ! > > then: aBlockOrArray on: aClass do: aBlock > ^ (self then: aBlockOrArray) on: aClass do: aBlock > ! > > then: aBlockOrArray on: aClass do: aBlock catch: anotherBlock > ^ ((self then: aBlockOrArray) on: aClass do: aBlock) catch: > anotherBlock > ! ! > > Promise setTraitComposition: {TThenable} asTraitComposition! > ! ! > > > > phil(a)highoctane.be wrote: > >> https://github.com/guillep/Scale <https://github.com/guillep/Scale> is >> quite cool for quick scripts on *nix. >> >> Now for embeddable, yes it would help. Bootstrapping will be helpful but >> the current main issue is the VM interpret loop that is in the current >> VMs. >> >> It is not an intrinsic problem. Telepharo is also a great step to enable >> that to exist. >> >> Phil >> >> On Oct 7, 2017 13:05, "Herby VojÄÃk" <herby(a)mailbox.sk >> <mailto:herby@mailbox.sk>> wrote: >> >> Ben Coman wrote: >> >> Nice article. I like the way you've structured it and pushed the >> "updated" angle. >> >> I feel a bit too strong a claim is laid on Pharo producing the >> CogVM. >> Much of the Cog + Spur + 64bit VM work was originally done for >> Squeak >> with Pharo riding the coat-tails of that work. Lately Pharo >> community >> has been involved in improving VM with hotspot optimisation with >> Sista >> and moving towards making Pharo embeddable.. (@Clement, is >> "hotspot >> >> >> Hi, this made me curious. I always had the problem with Amber (and, >> all the rest of Smalltalks in similar vein) that it is hard to use >> to one-off scripting, as it presumes existence of the not really >> small class library (objects, classes, collections, etc.). This >> disadvantaged it IMO in the field of "can I just embed it here and >> script it with a few lines?" scenarios. >> >> Did you (the Pharo community that is "moving towards making Pharo >> embeddable") find some way to work this around? >> >> cheers -ben >> >> >> Herby >> >> >> >> > -- Guille Polito Research Engineer Centre de Recherche en Informatique, Signal et Automatique de Lille CRIStAL - UMR 9189 French National Center for Scientific Research - *http://www.cnrs.fr <http://www.cnrs.fr>* *Web:* *http://guillep.github.io* <http://guillep.github.io> *Phone: *+33 06 52 70 66 13

Oct. 8, 2017

Can't find Cairo

by Steven R. Baker

Heya, I need some help telling Pharo where to find things. I've installed Bloc into my image, and it can't find cairo. Cairo is installed, but as far as I can tell Bloc is not looking for it in /usr/lib/x86_64-linux-gnu/ which is where it can be found. I don't care to go making symlinks around my system: is there a sensible way to tell Pharo where to find libcairo? Thanks! -Steven

Oct. 8, 2017

Re: [Pharo-users] FileReference#entries caching?

by Guillermo Polito

Hi, I don't think that FileSystem is caching entries... However, we found somehow related bug the other day with Mariano and Pablo while running OSSupprocess tests on travis/linux. The bug is as follows. The test was doing: '/tmp' asFileReference entries do: [...] And then it was calling 'lsof' over pharo's pid to know files that pharo has open. funny thing is that lsof was telling us that '/tmp' was open! When we already retrieved the entries and the file reference was collected... The same in osx or local linux mate running in a virtual box did not happen :/. On Sat, Oct 7, 2017 at 5:44 PM, Steven R. Baker <steven(a)stevenrbaker.com> wrote: > > > On 07/10/17 14:22, Peter UhnÃ¡k wrote: > > On Sat, Oct 7, 2017 at 1:02 PM, Steven R. Baker <steven(a)stevenrbaker.com> > wrote: > >> Is it cached or something? How do I guarantee that I'm *definitely* >> getting the current state of the directory on disk? > > > This looks extremely strange, I've never seen that inspecting > files/directories would be somehow "out of sync" with the disk, because it > is always asking the disk. > > > > Should I not even be using FileReference for this? >> > > If you are loading png icons into Pharo, you can consider using > https://github.com/peteruhnak/IconFactory/ instead (shameless self > promotion :) ) > > > Will definitely switch to this; I wasn't aware of the pattern, but > obviously I want to follow them where possible. :) > > Peter > > > -- Guille Polito Research Engineer Centre de Recherche en Informatique, Signal et Automatique de Lille CRIStAL - UMR 9189 French National Center for Scientific Research - *http://www.cnrs.fr <http://www.cnrs.fr>* *Web:* *http://guillep.github.io* <http://guillep.github.io> *Phone: *+33 06 52 70 66 13

Oct. 8, 2017

Problem with input to XML Parser - 'Invalid UTF8 encoding'

by PBKResearch

In another thread (on SVG Icons) Sven referred to ways of getting input from a URL for XMLDOMParser. I have recently had some problems doing this. I have found a workaround, so it is not urgent, but I thought I should put it on record in case anyone else is bitten by it, and so maybe Monty can look at it. I am using the subclass XMLHTMLParser, and my usual way of invoking it was: 1. XMLHTMLParser parseURL: <urlstring>. This works in most cases, but with one particular site - http://www.corriere.it/....., which is an Italian newspaper - I had frequent failures, with the error message 'Invalid UTF8 encoding'. The parser has the option of parsing a string, which is obtained by other means, so I tried reading it in with Zinc: 2. XMLHTMLParser parse: <urlstring> asZnUrl retrieveContents. And this worked, so clearly the encoding on the site is OK. I realised that the XML-Parser package has its own methods, which reproduce a lot of the functionality of Zinc, so I tried the equivalent: 3. XMLHTMLParser parse: <urlstring> asXMLURI get. To my surprise, this worked equally well. I had expected problems, because presumably forms (1) and (3) use the same UTF8 decoding. For now, I am using the form (3) for all my work, and have not had any problems since. So the message to anyone who is using the form (1) and getting problems is to try (2) or (3) instead. I am using Moose 6.1 (Pharo 6.0 Latest update: #60486) on Windows 10. I think most articles on the Corriere web site will generate the error, but one which has always failed for me is: http://www.corriere.it/esteri/17_ottobre_03/felipe-spagna-catalogna-discorso -8f7ac0d6-a86d-11e7-a090-96160224e787.shtml I tried to trace through the error using the debugger, but it got too confusing. However, I did establish that the failure occurred early in decoding the HTML <head>, in the line beginning <meta name="description".. The only unusual thing at this point is the French-style open-quote: '<'. Whether this could explain the problem I don't know. Any suggestions gratefully received. Peter Kenny

Oct. 8, 2017

Re: [Pharo-users] How to make pharo find sqlite?

by Alistair Grant

On Sat, Sep 30, 2017 at 01:28:06PM +0200, Herby Voj????k wrote: > phil(a)highoctane.be wrote: > >What about > > > >LD_LIBRARY_PATH=<sqlite3place>;$LD_LIBRARYPATH ./pharo-ui some.image > > > >Phil > > Thanks for answer, did not help. > > In fact it must be something different. As can be seen in the stack, it > fails during finalizers, and as can be seen by looking at > UDBCSQLite3DatabaseExternalObject class>>finalizeResourceData: code, the > method it calls is sqlite close. It is hardly the first method that is > should call... > > I suspect something around image save / load. Again. Lots of errors in those > parts. But may be something else, as it kicks in only when SQLite-using > tests starts to run. :-( > > Herby > > P.S.: I saw there is a similar thread out there, but it has problems with > 32bit loaded by 64bit vm; but here, I have 32bit linux, so the vm installed > should be 32bit. Sorry I'm a bit late to the party... I'm using Glorp / UDBCSQLite3 on Ubuntu 16.04 without any problems (admittedly 64 bit Ubuntu, but as you say, that shouldn't matter). Just in case you copy-and-pasted the code, Phil's example has a typo: the path separator is a colon (:), not semicolon (;). Install libsqlite3-dev and adding /usr/lib/i386-linux-gnu to LD_LIBRARY_PATH is all I had to do to get it to work (no changes to UDBCSQLite3Library>>library). Actually LD_LIBRARY_PATH normally shouldn't be required, but I'm running inside a snap container, which is an unusual environment. > root@32bit-agent:~# find / -name '*libsqlite*' -type f 2>>/dev/null > /usr/lib/i386-linux-gnu/libsqlite3.so.0.8.6 It seems strange that there isn't libsqlite3.so. I think the real solution would be to find out why libsqlite3.so doesn't exist, but after installing libsqlite3-dev, a workaround would be to try creating a symbolic link from libsqlite3.so.0.8.6 to libsqlite3.so. Cheers, Alistair

Oct. 8, 2017

Re: [Pharo-users] What does RMoD stand for?

by Stephane Ducasse

It stands for nothing :) just Remodularisation dropping letters and making sure that they are not thousands of other people in the web having the same name :). On Sat, Oct 7, 2017 at 1:27 PM, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > > >> On 7 Oct 2017, at 13:06, Rene Paul Mages (ramix) <pharo(a)rmages.com> wrote: >> >> >> >> Le 07/10/2017 Ã 12:59, horrido a Ã©crit : >>> It is bizarre. Nowhere on the web can I find any reference to what INRIA's >>> *RMoD* acronym stands for. >> >> Please try this request : >> >> https://tinyurl.com/INRIA-Rmod > > But it is strange that their main page does not say (AFAICS). > > It is something like Research into Modular Systems, but I am just guessing ;-) > >> -- >> Amicalement. >> Rene Paul Mages ( GnuPG_key 1024D/2CC455D9 ) >> http://www.linux-azur.org/ramix >> http://blog.pharo.fr >> http://nosoftwarepatents.wikidot.com >> >> >> > >

Oct. 7, 2017

Re: [Pharo-users] Embeddable Smalltalk (was: Re: Behold Pharo: The Modern Smalltalk)

by Stephane Ducasse

I would love to have pharo embeddable from C. But we are not yet there. Now we worked and will continue to make sure that Pharo can work in readonly mode and we will have a tiny core. Stef On Sat, Oct 7, 2017 at 2:43 PM, Ben Coman <btc(a)openinworld.com> wrote: > > > On Sat, Oct 7, 2017 at 7:05 PM, Herby VojÄÃk <herby(a)mailbox.sk> wrote: >> >> Ben Coman wrote: >>> >>> Nice article. I like the way you've structured it and pushed the >>> "updated" angle. >>> >>> I feel a bit too strong a claim is laid on Pharo producing the CogVM. >>> Much of the Cog + Spur + 64bit VM work was originally done for Squeak >>> with Pharo riding the coat-tails of that work. Lately Pharo community >>> has been involved in improving VM with hotspot optimisation with Sista >>> and moving towards making Pharo embeddable.. (@Clement, is "hotspot >> >> >> Hi, this made me curious. I always had the problem with Amber (and, all >> the rest of Smalltalks in similar vein) that it is hard to use to one-off >> scripting, as it presumes existence of the not really small class library >> (objects, classes, collections, etc.). This disadvantaged it IMO in the >> field of "can I just embed it here and script it with a few lines?" >> scenarios. >> >> Did you (the Pharo community that is "moving towards making Pharo >> embeddable") find some way to work this around? > > > Embeddable here is no so much for one-off scripting, but more becoming an > integrated part of an application driven by an event loop of a game engine > rather than the existing VM event loop. I'd expect much of the class > library to be available here, so your question is orthogonal. > > I've seen discussion of projects for Pharo work from the command line, but I > don't know their status. > > cheers -ben

Oct. 7, 2017