September 2016 - Pharo-users

bug in debugger?
by Usman Bhatti Sept. 28, 2016

Sept. 28, 2016

Hello, I have a strange error in my image that results in image start taking up system memory and crashes when it attains the max. the VM can provide on my machine (2Gb). I am working on Pharo 4.0 + Spec debugger. After some digging in the image, I know that the error comes from an assignment operation (below in bold). And the bug only occurs when the method initialize is executed as inherited method. The strange part is that that it does not crash when the value assigned is slightly different e.g. "nosignature1" instead of "nosignature". FAMIXInvocation>>initialize super initialize. sender := nil. receiver := nil. receiverSourceCode := nil. *signature := 'nosignature'.* candidates := FMMultiMultivalueLink on: self opposite: #incomingInvocations. The crash doesn't happen when I override initialize in the subclass without sending initialize message to the superclass. So this report is about a very very specific case, but it is there. I tried to analyze further in the debugger but with announcements, etc. I wasn't able to achieve anything. So, if someone's interested to have a look, I can provide the image. regards. Usman

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Essential Documentation
by julius Sept. 28, 2016

Sept. 28, 2016

Probably this is a very beginners question but is there a documentation online or within the Pharo image for all the base-framework components like all collections, Morphic, Numbers and so on? I know Pharo uses a lot the 'see and discover yourself' approach but sometimes, especially for beginners it would be nice to have a documentation for most classes and also have programming guides. Coming from macOS and iOS development I think about something like Swift or Objective-C has. For example you have every class there documented but also you have programming guides for how to draw graphics. It would be really helpful to have somthing like that for example for Voyage (maybe it's there but I did not found it). Thanks for helping me out! Julius -- View this message in context: http://forum.world.st/Essential-Documentation-tp4916861.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

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Slots in Pharo 5
by Jan Cada Sept. 28, 2016

Sept. 28, 2016

Hi, I started to play with slots and I am observing odd behaviour after the class structure gets changed. I am having classes: Object subclass: #CTA slots: { #x. #b => ToManyRelationSlot inverse: #a inClass: #CTB } classVariables: { } category: âClassTest' and Object subclass: #CTB slots: { #x. #a => ToOneRelationSlot inverse: #b inClass: #CTA } classVariables: { } category: âClassTest' then I create instance of CTA and CTB pointing to CTA: a1 := CTA new x: 1; yourself. b1 := CTB new x: 1; a: a1; yourself. the a1 is updated as expected with b having RelationSet with my CTB instance. The problem is when I decided to update the class CTA - changing position of slot #b => ToManyRelationSlot inverse: #a inClass: #CTB. In the case I drop all the instances of CTA and CTB and recreate new by code above, the inverse update always addresses slot on same position as before and not the one with right name. For example when I change it like : Object subclass: #CTA slots: { #x. #children => ToManyRelationSlot inverse: #parent inClass: #CTA. #b => ToManyRelationSlot inverse: #a inClass: #CTB. #parent => ToOneRelationSlot inverse: #children inClass: #CTA } classVariables: { } category: âClassTest' the result of the code a1 := CTA new x: 1; yourself. b1 := CTB new x: 1; a: a1; yourself. is that slot children gets updated having RelationSet with my CTB instance instead of slot b which has empty RelationSet. The question is: Am I doing something wrong ? Is there any way how to tell class to reinit slots as its order has changed ? Thanks, Jan

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Tech Meeting notes
by stepharo Sept. 28, 2016

Sept. 28, 2016

Hi guys I tried to take some notes of the discussion and report of effort made by esteban VM works ======== - migrating our source to opensmalltalk vm 80% of our source - keybindings enhancement - shift key pressed - library symbols - change our cmake maker -> plain makefiles - port our process (running all the tests) - new VMs will get out - ARM VM is under dev and started to run. - migration planned for end of week of next weeks - right now able to build 32 and 64 on mac and linux. plan with mid october. - for windows - We will produce assert vm to help people to find problems. - Sierra support is coming. - openssl It will come after the end of the merge finished. - FFI bug about the Athens canvas. - FT bug is getting on the radar and esteban suspects that the bug is in the C plugin. We plan to throw away the FT plugin. If people want to help please have a look at thibaultRaffaillac bindings. - Pharo is using different VM functionalities so sometimes we are going on unfrequented paths. - Threaded FFI will come after 64, ARM, two bugs Probably beginning of the year. Iceberg ======== here is the log that nicolas sent to our internal mailing-list ### Last week: - Improved travis support, working on having all green tests in travis, still 4 to go. - Extending libgit support. - Support for synchronizing an Iceberg repository with code that was loaded with gitfiletree (was not working, as reported by Norbert). - Fixed some bugs (see https://github.com/npasserini/iceberg/milestone/7?closed=1) ### This week (starting 2016-09-26): - Finish having all tests running on travis. - Better management of ssh keys (which in turn is required for travis working correctly). - Also I would like to add some little GUI details that bother me in daily work (such as remembering common options, highlighting outdated repositories, or opening repositories from spotter). I think that this might take the whole week. After that I plan to add basic support synchronizing against code that was loaded from any repository. With that finished, we could release v0.3 After that, the plan for v0.4 is to make libgit our default backend, and make gitfiletree dependencies optional. - I am pretty close to have all tests running for libgit again, then we should try to use libgit as backend for the UI. But in that process also improve test coverage so that we minimize dependence on manual verification of the UI. - Remodularice in order to separate gitfiletree dependencies, so we will be able to use Iceberg without loading ossubprocess (or gitfiletree). - That will require also to write an independent cypress reader/writer, because the current one inherits from gitfiletree. If we have all this, I think that we could have a version that could be included in the base image, probably in the second half of october.

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using glorp and active record
by Sean Glazier Sept. 27, 2016

Sept. 27, 2016

Hi, I have been trying to get glorp using active record working in pharo 5. I have a descriptor class for it and the classes inherit from active Record. I describe the table as: tableForAnswer: aTable | vistorId questionId | (aTable createFieldNamed: 'id' type: platform serial) bePrimaryKey. questionId := aTable createFieldNamed: 'questionId' type: platform integer. vistorId := aTable createFieldNamed: 'vistorId' type: platform integer. aTable createFieldNamed: 'answer' type: platform text. aTable addForeignKeyFrom: vistorId to: ((self tableNamed: 'VISITORS') fieldNamed: 'ID') suffixExpression: 'MATCH SIMPLE ON UPDATE NO ACTION ON DELETE CASCADE'. aTable addForeignKeyFrom: questionId to: ((self tableNamed: 'QUESTIONS') fieldNamed: 'ID') suffixExpression: 'MATCH SIMPLE ON UPDATE NO ACTION ON DELETE CASCADE' the table in the DB was preexisting. when I do Answer findAll I get and error that it is expecting a number for the id field. in the PostgresSQLPlaform serial is defined thusly. serial "For postgresql, we use sequences, and explicitly get the values ourselves, so just tell the database that they're integers." ^self typeNamed: #serial ifAbsentPut: [GlorpSerialType new typeString: 'integer']. What the DB hands back is 'nextval('answers_id_seq'::regclass)' which seems correct if it is telling me that there exists a sequence for this field and that is the correct command to issue for the field. am I defining this table incorrectly? or should I bag using active Record. I kind of liked it when working in Visualworks because there were also tools that would read in and describe the tables and then tools to assit when you needed to migrate to another version and do the changes etc. FYI this is the query that is being run that fails. SELECT t1.table_name, t1.table_schema, t1.column_name, t1.is_nullable, t1.data_type, t1.column_default, t1.character_maximum_length, EXISTS (SELECT DISTINCT 'x' FROM ((INFORMATION_SCHEMA.table_constraints s1t1 INNER JOIN INFORMATION_SCHEMA.key_column_usage s1t3 ON ((s1t1.table_name = s1t3.table_name) AND ((s1t1.table_schema = s1t3.table_schema) AND (s1t1.constraint_name = s1t3.constraint_name)))) INNER JOIN INFORMATION_SCHEMA.columns s1t2 ON (((s1t3.column_name = s1t2.column_name) AND (s1t3.table_schema = s1t2.table_schema)) AND (s1t3.table_name = s1t2.table_name))) WHERE ((s1t1.constraint_type = 'PRIMARY KEY') AND ((s1t2.column_name = t1.column_name) AND (((s1t2.table_schema = t1.table_schema) AND (s1t2.table_name = t1.table_name)) AND ((s1t2.table_schema = t1.table_schema) AND (s1t2.table_name = t1.table_name)))))) FROM INFORMATION_SCHEMA.columns t1 WHERE ((t1.table_name = 'answers') AND (t1.table_schema = 'public')) it looks as though it is reading in the schema and is expecting and integer because we told it to in the serial method on the PostgesSQLPlatform. As much as I love diving into these frameworks to figure out the deep inner workings, I really need to be getting data in and out without a fuss. Should I follow the DBX example where the descriptor is orthogonal to the model and one does not subclass from active record? I also note that not all the glorp tests pass. I think the were rather minor fails like timezone issues or something. It took a while but the test created a number of tables in the DB. So again Have I done something Obtuse that I qught to be slapped for here? thanks

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Mustache templates listed the in Mustache site
by Esteban A. Maringolo Sept. 27, 2016

Sept. 27, 2016

Some months ago I sent a pull request [1] to add Smalltalk/Pharo to the list of supported languages in Mustache home page < http://mustache.github.io/>. Took some time but now it is in the front page. Thank you Norbert Hartl for this useful library. Regards! Esteban A. Maringolo [1] https://github.com/mustache/mustache.github.com/pull/77

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Why Pharo?
by Stephan Eggermont Sept. 26, 2016

Sept. 26, 2016

I finally found the time to put the slides and narrative together https://medium.com/@stephan_32833/pharo-50c66685913c#.jeou548z7 Stephan

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Full-Time Academic Position, University of Chile
by Alexandre Bergel Sept. 26, 2016

Sept. 26, 2016

Dear All, We have an open academic position. Full-Time Academic Position Computer Science Department, University of Chile http://www.dcc.uchile.cl The Computer Science Department of the University of Chile (DCC) is offering a full-time permanent position to carry out research and teaching, at the undergraduate and graduate levels. The DCC is the leading Computer Science Department in Chile, and one of the most active in Latin America. It pioneered the use of Unix and the adoption of the Internet in Chile. Today, it has 22 full-time professors, 10 of which come from Argentina, Uruguay, Belgium, France, and Ireland. We carry out high-quality research, publishing frequently in the most prestigious international conferences and journals. The DCC is in charge of the undergraduate Computer Science program within the Engineering Faculty of the University of Chile, reaching a thousand students in the first year of Engineering, and taking care of the CS specialization from the third year onward for over two hundreds students. Our MSc and PhD programs attract the best students from Latin America, with currently around fifty students in each program. The DCC offers newcomers an individual office and necessary equipment, as well as a starting grant for initiating their research activities; further funding is then obtained permanently upon publications. This is usually complemented with funds from a personal research project obtained from Conicyt, the national research agency, and/or with funds from larger collaborative projects. An assistant professor can supervise students of any level and have a light administrative load. Professors in our department are expected to teach three courses per year; typically one of these courses is an elective that the professor can define according to his/her interests. The salary provided by the University is very competitive, and depends on the ranking (assistant, associate, full); it is complemented with research projects. The successful candidate should be an active researcher with a PhD in Computer Science (or about to obtain it before starting the position). We are interested in any area of Computer Science, and both junior and senior researchers are welcome to apply. The candidate will be evaluated on the basis of both research and teaching activities, impact, as well as vision for the future. Important Dates We accept applications until November 30, 2016. The expected starting date is March 1, 2017 (August 2017 at the latest). Location The DCC is located in Santiago de Chile. Santiago is the capital and largest city in Chile, with a lively cultural scene and delectable cuisine. It is located at the foothills of the Andes, with over 300 days of sun per year, and both ski slopes and the Pacific coast at a 1-hour drive. Santiago is well-connected through direct flights to major hubs in both Europe and the USA. Chile is a country with a lot to offer especially to nature lovers, with over 4,300 km of seashore and mountains, filled with stunning landscapes and national parks stretching from Patagonia to the Atacama desert. For enquiries, please contact Prof. Gonzalo Navarro at gnavarro(a)dcc.uchile.cl -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

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[ANN] FFI Tutorial, Pharo5 / Libclang
by Ben Coman Sept. 25, 2016

Sept. 25, 2016

hi all, Just announcing that I'm writing a series of posts on using FFI in Pharo 5 to interface to libclang, the interface library for the LLVM C compiler. http://blog.openinworld.com/2016/09/pharo-libclang-ffi-part-1-preamble/ I'm writing this from the perspective of a FFI newbie progressively learning the system. I've left in a few mis-steps since I think it can be useful seeing what didn't work. cheers -ben

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Script to migrate all mcz packages to git?
by Holger Freyther Sept. 24, 2016

Sept. 24, 2016

Hi, I think I have seen something but can't find it right now. I would like to move to git but preserve the history (and my commit messages and the commit date/time). Is there a script that goes through all versions of a package and copies them to git repository? Will it be able to preserve the original commit date? thank you holger

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