September 2015 - Pharo-users

printing

by Ben Coman

What options do we have for hardcopy printing from Pharo? That is, functionality for an application File > Print... cheers -ben

Sept. 28, 2015

NeoCSV and special handling for some columns

by Nicolai Hess

Hi, I have two problems I could not solve: 1. I would like to read only some columns: I have a large file with ~30 colums, but I am only interested on ~5 columns (not that important, I could pre-process the file) but anyway it would be nice to do it in smalltalk. 2. some columns will contain only strings (quoted values) and some only numbers, but the field may be empty, is it possible to define the default "emptyValue" as an - empty string for empty fields in the "string column" - 0 for empty fields in the "number column"? thanks in advance nicolai

Sept. 28, 2015

Re: [Pharo-users] Changing method icons priorities in nautilus

by Damien Cassou

Peter UhnÃ¡k <i.uhnak(a)gmail.com> writes: > So would it make sense to swap the priority? I agree with you. -- Damien Cassou http://damiencassou.seasidehosting.st "Success is the ability to go from one failure to another without losing enthusiasm." --Winston Churchill

Sept. 28, 2015

Changing method icons priorities in nautilus

by Peter UhnÃ¡k

Hi, is it a good idea to have the test icon have higher priority than overrides (is overriding parent method/the method is overriden by a child) â Because the state of the test is also available from: 1) the test class itself 2) TestRunner (and one of the two I will have open regardless) And often a method affects more than one test so the icon is not representative of the state anyway. On the other hand if I want to reach the overriden method it's much harder because I have to open new browser, click on the class, find the method. So would it make sense to swap the priority? There's long standing issue in the tracker with having multiple icons per method, but resolving that from UI perspective is perhaps not as easy... (The remaining priorities seem ok... higher number = more important) â Peter

Sept. 28, 2015

Re: [Pharo-users] Pharo - database without database

by Stephan Eggermont

On 27-09-15 18:47, Adam wrote: > 1) Object memory limit: Current object memory of Pharo is limited to 4GB. Free > version of GemStone/S is also limited to 4GB, so I would rather stick with > Pharo until I reach this level. And in the future this limit grow due to 64bit > version of VM. The information on GemStone seems incorrect. https://gemtalksystems.com/licensing/ What I read there is that the Limited (email address required) license supports 50 GB of (on-disk) objects, with a 2GB shared page cache. Stephan

Sept. 28, 2015

Re: [Pharo-users] Is Pharo the best system to make this application?

by Stephan Eggermont

On 27-09-15 22:06, Justin Northrop wrote: > I've described it here: > > https://www.reddit.com/r/smalltalk/comments/3mk0pe/what_system_should_i_use… > > Basically, it's a visual programming language, and an environment > controlled by this language that allows real-time shared editing of the > visual language, and real-time transmission of audio and video. Pharo will support you well in quickly finding out where the difficulties are. Real-time shared video provides interesting challenges, not just to the programming environment. Stephan

Sept. 28, 2015

Re: [Pharo-users] is " #^ " legal syntax?

by Udo Schneider

> The definition is that # can be followed by a message selector > (including binary selectors such as -), or by a quoted string, or by an > opening parenthesis (array literal). Thanks for the info. Thinking in terms of the parser tokens makes things clear now. Thanks, Udo On 27/09/15 13:05, Thierry Goubier wrote: > Hi Udo, > > #^ is invalid by definition. #'^' is the right way to write it. > > The definition is that # can be followed by a message selector > (including binary selectors such as -), or by a quoted string, or by an > opening parenthesis (array literal). > > Regards, > > Thierry > > Le 27/09/2015 12:27, Udo Schneider a Ã©crit : >> All, >> >> I just hit a case where I needed to return the caret character "^" as a >> Symbol. However simply doing something like >> >> method >> ^ #^. >> >> doesn't work. Even inspecting the symbol itself >> >> #^ inspect. >> >> doesn't work. "Quoting" the caret works fine: >> >> method >> ^ #'^'. >> >> So I'm wondering whether #^ (w/o) quoting is considered to be legal >> syntax and it's a parser "bug" or whether it's invalid by definition >> >> CU, >> >> Udo >> >> >> > > >

Sept. 28, 2015

Re: [Pharo-users] Pharo - database without database

by Adam

Hello, it is true: http://book.seaside.st/book/advanced/persistency Thank You very much. Adam Dne Po 28. zÃ¡ÅÃ 2015 08:50:28, stepharo napsal(a): > If I'm correct we wrote about it on the seaside book > http://book.seaside.st > > Le 27/9/15 20:23, Adam a Ã©crit : > > Hello, > > > > thank You for great hints. I will look at this. > > > > Have a nice day, > > > > Adam. > > > > Dne Ne 27. zÃ¡ÅÃ 2015 19:16:10, phil(a)highoctane.be napsal(a): > >> Adam, > >> > >> SandstoneDb may be of interest to you: > >> > >> http://www.smalltalkhub.com/#!/~gnaritas/SandstoneDb > >> "SandstoneDb is a lightweight Prevayler style embedded object database > >> with > >> an ActiveRecord API that doesn't require a command pattern and works for > >> small apps that a single Squeak image can handle. The idea is to make a > >> Squeak image durable and crash proof and suitable for use in small office > >> applications. > >> > >> Data is kept in ram for speed and on disk for safety. All data is > >> reloaded > >> from disk on image startup. > >> > >> Since we're dealing with live objects in memory, concurrency is handled > >> via > >> optional record level critical sections rather than optimistic locking > >> and > >> commit failures. It's up to the developer to use critical sections at the > >> appropriate points by using the critical method on the record. > >> > >> Saves are atomic for an ActiveRecord and all its non ActiveRecord > >> children, > >> for example, an order and its items. There is no atomic save across > >> multiple ActiveRecords. A record is a cluster of objects that are stored > >> in > >> a single file together. > >> > >> After installing SandstoneDb make sure to restart your image before > >> attempting to use it or running the tests." > >> > >> > >> Fuel may also have something in stock: > >> > >> https://ci.inria.fr/pharo-contribution/view/Books/job/EnterprisePharoBook > >> /la stSuccessfulBuild/artifact/book-result/Fuel/Fuel.pdf > >> > >> > >> I also use Mapless > >> > >> http://sebastianconcept.github.io/Mapless/ > >> > >> > >> HTH > >> > >> Phil > >> > >> On Sun, Sep 27, 2015 at 6:47 PM, Adam <adam(a)234.cz> wrote: > >>> Hello, > >>> > >>> I was wondering if it is possible for Pharo to load lots of data and > >>> query > >>> them without using external DB, just using object memory. Well, someting > >>> like > >>> GemStone/S, but not so sophisticated. > >>> > >>> I did some research so here is details what I found. I would appreciate > >>> if > >>> someone can tell me if any points of this agenda can be allready done or > >>> need > >>> to be programmed, or if this whole idea is waste of time and it is > >>> better > >>> to > >>> use external DB. > >>> > >>> 1) Object memory limit: Current object memory of Pharo is limited to > >>> 4GB. > >>> Free > >>> version of GemStone/S is also limited to 4GB, so I would rather stick > >>> with > >>> Pharo until I reach this level. And in the future this limit grow due to > >>> 64bit > >>> version of VM. > >>> 2) Saving to disk: Is it possible to save object or group of objects to > >>> disk > >>> and ensure consistency? With some transaction mechanism and transaction > >>> log? > >>> 3) RAM limit: Is it possible to delete objects from memory, move them to > >>> the > >>> disk and not break its connections to other objects? For example by > >>> redirecting object internal ID to some kind of hollow object, that will > >>> renew > >>> receiver of message from disk if necessary... This approach can also > >>> possibly > >>> split object memory into more "remote" sources. > >>> 4) Indexing: What optimalization for searching current collections in > >>> Pharo > >>> do? For example: how to store instances of City if I would like to > >>> search > >>> through it by name and also by its postal code? Is there some library > >>> for > >>> creating fulltext search (maybe Spotter uses that - I did not study it > >>> yet). > >>> > >>> Have a nice day, and thanks for any answer. > >>> > >>> Adam

Sept. 28, 2015

Re: [Pharo-users] Pharo - database without database

by stepharo

If I'm correct we wrote about it on the seaside book http://book.seaside.st Le 27/9/15 20:23, Adam a Ã©crit : > Hello, > > thank You for great hints. I will look at this. > > Have a nice day, > > Adam. > > > Dne Ne 27. zÃ¡ÅÃ 2015 19:16:10, phil(a)highoctane.be napsal(a): >> Adam, >> >> SandstoneDb may be of interest to you: >> >> http://www.smalltalkhub.com/#!/~gnaritas/SandstoneDb >> "SandstoneDb is a lightweight Prevayler style embedded object database with >> an ActiveRecord API that doesn't require a command pattern and works for >> small apps that a single Squeak image can handle. The idea is to make a >> Squeak image durable and crash proof and suitable for use in small office >> applications. >> >> Data is kept in ram for speed and on disk for safety. All data is reloaded >> from disk on image startup. >> >> Since we're dealing with live objects in memory, concurrency is handled via >> optional record level critical sections rather than optimistic locking and >> commit failures. It's up to the developer to use critical sections at the >> appropriate points by using the critical method on the record. >> >> Saves are atomic for an ActiveRecord and all its non ActiveRecord children, >> for example, an order and its items. There is no atomic save across >> multiple ActiveRecords. A record is a cluster of objects that are stored in >> a single file together. >> >> After installing SandstoneDb make sure to restart your image before >> attempting to use it or running the tests." >> >> >> Fuel may also have something in stock: >> >> https://ci.inria.fr/pharo-contribution/view/Books/job/EnterprisePharoBook/la >> stSuccessfulBuild/artifact/book-result/Fuel/Fuel.pdf >> >> >> I also use Mapless >> >> http://sebastianconcept.github.io/Mapless/ >> >> >> HTH >> >> Phil >> >> On Sun, Sep 27, 2015 at 6:47 PM, Adam <adam(a)234.cz> wrote: >>> Hello, >>> >>> I was wondering if it is possible for Pharo to load lots of data and query >>> them without using external DB, just using object memory. Well, someting >>> like >>> GemStone/S, but not so sophisticated. >>> >>> I did some research so here is details what I found. I would appreciate if >>> someone can tell me if any points of this agenda can be allready done or >>> need >>> to be programmed, or if this whole idea is waste of time and it is better >>> to >>> use external DB. >>> >>> 1) Object memory limit: Current object memory of Pharo is limited to 4GB. >>> Free >>> version of GemStone/S is also limited to 4GB, so I would rather stick with >>> Pharo until I reach this level. And in the future this limit grow due to >>> 64bit >>> version of VM. >>> 2) Saving to disk: Is it possible to save object or group of objects to >>> disk >>> and ensure consistency? With some transaction mechanism and transaction >>> log? >>> 3) RAM limit: Is it possible to delete objects from memory, move them to >>> the >>> disk and not break its connections to other objects? For example by >>> redirecting object internal ID to some kind of hollow object, that will >>> renew >>> receiver of message from disk if necessary... This approach can also >>> possibly >>> split object memory into more "remote" sources. >>> 4) Indexing: What optimalization for searching current collections in >>> Pharo >>> do? For example: how to store instances of City if I would like to search >>> through it by name and also by its postal code? Is there some library for >>> creating fulltext search (maybe Spotter uses that - I did not study it >>> yet). >>> >>> Have a nice day, and thanks for any answer. >>> >>> Adam >

Sept. 28, 2015

Re: [Pharo-users] is " #^ " legal syntax?

by Thierry Goubier

Le 28/09/2015 03:58, Ben Coman a Ã©crit : > Interesting though that > > #'a' printIt--> #a > > but > > #'^' printIt--> #'^' If the symbol contains characters which would not make it a valid symbol, enclose with quotes. Note that #'' is possible. Thierry > > cheers -ben > > On Sun, Sep 27, 2015 at 7:05 PM, Thierry Goubier > <thierry.goubier(a)gmail.com> wrote: >> Hi Udo, >> >> #^ is invalid by definition. #'^' is the right way to write it. >> >> The definition is that # can be followed by a message selector (including >> binary selectors such as -), or by a quoted string, or by an opening >> parenthesis (array literal). >> >> Regards, >> >> Thierry >> >> >> Le 27/09/2015 12:27, Udo Schneider a Ã©crit : >>> >>> All, >>> >>> I just hit a case where I needed to return the caret character "^" as a >>> Symbol. However simply doing something like >>> >>> method >>> ^ #^. >>> >>> doesn't work. Even inspecting the symbol itself >>> >>> #^ inspect. >>> >>> doesn't work. "Quoting" the caret works fine: >>> >>> method >>> ^ #'^'. >>> >>> So I'm wondering whether #^ (w/o) quoting is considered to be legal >>> syntax and it's a parser "bug" or whether it's invalid by definition >>> >>> CU, >>> >>> Udo >>> >>> >>> >> >> > >

Sept. 28, 2015