Beginners September 2012

beginners@lists.squeakfoundation.org

11 participants
11 discussions

Re: [Scratch] building the scratch image from the source?
by Bert Freudenberg 28 Sep '12

28 Sep '12

On 2012-09-28, at 18:27, Matthew Miller <mattdm(a)mattdm.org> wrote: > On Fri, Sep 28, 2012 at 06:23:39PM +0200, Bert Freudenberg wrote: >> This may sound odd, but e.g. the GPL states that sources must be >> distributed in their "Preferred Form For Modification". In Smalltalk's >> case, that preferred form is the image. All the code is available and >> ready to be inspected and modified using Smalltalk tools. It's just a bit >> different from most other popular programming systems. > > No, it sounds reasonable. I can probably get the Fedora packaging committee > to okay it. (Which is my agenda is asking this question -- I don't > _actually_ want to make any modifications at this point.) > > Is the preferred form _just_ the Scratch.image, or is it the image plus the > SqueakV2.sources plus the src/Scratch.changes file? All three. Sources and changes are a database of the source code (referenced from the image using absolute file offsets). Since Fedora accepted Etoys, I see no problem for Scratch. - Bert -

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Re: [Scratch] building the scratch image from the source?
by Bert Freudenberg 28 Sep '12

28 Sep '12

On 2012-09-28, at 17:00, Matthew Miller <mattdm(a)mattdm.org> wrote: > Pardon me for the squeak newbie question. Is it possible to build the > scratch image from the source files distributed in a scripted way? Do you do > this internally when working on the project? No. > In Fedora, shipping compiled binaries in the source isn't okay. The > Scratch.image isn't an arch-specific compiled binary, but it *is* squeak vm > bytecode, right? It is a snapshot of the complete run-time memory of Squeak. Squeak is a version of Smalltalk, the original object-oriented system. It is not text-based. Coding in Smalltalk means loading a snapshot from disk, modifying objects in memory, and dumping the whole thing to a file between sessions. The "image" is evolved from version to version. It has some objects in it that were created decades ago. Literally. The last time the image was bootstrapped was in the 70ies. This may sound odd, but e.g. the GPL states that sources must be distributed in their "Preferred Form For Modification". In Smalltalk's case, that preferred form is the image. All the code is available and ready to be inspected and modified using Smalltalk tools. It's just a bit different from most other popular programming systems. Btw, we have a special list for Squeak newbie questions: http://lists.squeak.org/mailman/listinfo/beginners (actually, I'm going to cc this reply to that list) - Bert -

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Objects graph
by Mateusz Grotek 27 Sep '12

27 Sep '12

Dear Squeakers, I have the following problem: Please imagine objects as a directed graph. What I want to do is to run a method exactly once for each object. I can do it in O(N*log(N)) time by using a tree or other datastructures. It seems it's impossible to do it in O(N). The reason for that is there is a comment in Object class which says I should not extend it by adding any additional instance variables. Additional points: 1. I want to be able to do this for ANY object, so subclassing and adding an instance variable to a subclass won't work. (imagine for example, that I need to create an extension of Smalltalk which should work with all current Smalltalk classes, or something like that) 2. I cannot create an isomorphic graph with some other objects (of a special class created by me), because I do not know how to detect sharing of subobjects and cycles. Is there a nice solution of this problem? What would happen if I add an instance variable to Object (besides more memory used)? Do you think adding one instance variable to Object class as a standard feature of Squeak's library would break anything. This variable could be used for example in veryDeepCopy etc. Maybe it's not a good idea... Kind regards, Mateusz

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Computational complexity of become: and becomeForward:
by Mateusz Grotek 27 Sep '12

27 Sep '12

Dear Squeakers, What is the computational complexity of become: and becomeForward:? Best wishes, Mateusz

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Bigdaddy27 left a message for you
by Blendr 27 Sep '12

27 Sep '12

Bigdaddy27 left a message for you Only you can see the sender and content of your message, and you can delete it anytime. You can instantly reply using our message exchange system: http://us1.blendr.com/01223056288/in/MIs7XKpRLPs/?lang_id=3&m=63&mid=506465… Some other people in the area who are on Badoo Euro (Boston, United States) amy smith (Boston, United States) Zizou (Boston, United States) http://us1.blendr.com/01223056288/in/MIs7XKpRLPs/?lang_id=3&m=63&mid=506465… If the link in this message does not work, try copying and pasting it into your browser. This email is part of our delivery procedure for the message sent by Bigdaddy27. If you have received this email by mistake, please ignore it. The message will be deleted soon. Have fun! The Blendr Team Blendr is powered by Badoo. You have received this email from Badoo Trading Limited (postal address below). If you do not wish to receive further email communications from Badoo, http://us1.blendr.com/impersonation.phtml?lang_id=3&email=beginners%40lists… here to opt out. Badoo Trading Limited is a limited company registered in England and Wales under CRN 7540255 with its registered office at 44a The Green, Warlingham, Surrey, CR6 9NA.

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How to start Squeak from a Linux terminal?
by Herbert König 14 Sep '12

14 Sep '12

Hi, I managed to download squeak all in one to a Linux computer running Ubuntu 12.04 (new to Linux). I made the necessary files executable, made Squeak run headless. It works if I double click squeak.sh in the GUI. If I open a terminal, CD into the Squeak folder and type "squeak.sh" I get a "command not found". Never felt so newbie in decades :-)) Thanks, Herbert

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Marching ants
by Bert Freudenberg 13 Sep '12

13 Sep '12

This came up on stack overflow (*), might be interesting to some: (PolygonMorph vertices: Rectangle fromUser corners color: Color transparent borderWidth: 2 borderColor: Color black) dashedBorder: {10. 10. Color white. 0. 1}; openInHand - Bert - (*) http://stackoverflow.com/questions/12393970/

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Re: Global string search and replace in an image
by Andy Burnett 12 Sep '12

12 Sep '12

Thanks everyone, that has given me some great ideas. I think refactoring is clearly the way to go, and - at least - I now know how to search for the terms in the source code. Cheers Andy

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Re: Global string search and replace in an image
by Andy Burnett 11 Sep '12

11 Sep '12

I thought Andy was talking about source code. > > Personally, if I have to rename a method, I search for all senders and fix > them with copy&paste. Same for class renames, inst var renames, etc. There > just are not that many occurrences, so fixing each one individually is > quick, plus I get to verify that the change is indeed what I wanted. > > There is a tool to automate a lot of this called the Refactoring Browser, > which many developers like, but I don't even have it in my image. > Thanks very much to both of you. Bert, you are quite right, I was talking about changing strings in source code - sorry, I should have made that clear. The problem is that we I am dealing with an image where a number of strings have been hard coded into various methods. What I was looking for was a global - source code - search and replace. Does that exist? Or, is it possible to FileOut the entire source tree, do a search and replace externally, and then file it in again. I have tried this in the past, but the image never seems to work properly afterwards. Clearly, the correct way to solve the problem is to abstract the hard coded text into another object - or maybe a global variable? Perhaps I will just have to bite the bullet. This would make it far easier for internationalisation etc. Actually, are there any packages to help with internationalisation? Cheers Andy

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OmniBrowser and Refactoring
by H. Hirzel 11 Sep '12

11 Sep '12

Andy, There is a SystemBrowser which has many more features than SystemBrowser which comes with the Squeak trunk image. On 9/11/12, Bert Freudenberg <bert(a)freudenbergs.de> wrote: > > On 2012-09-11, at 01:43, Chris Cunnington <smalltalktelevision(a)gmail.com> > wrote: > >> On 12-09-10 7:34 PM, Andy Burnett wrote: >>> Hello, >>> >>> Is there a method - or other mechanism - that would let me find all >>> instances of 'foo' and replace them with 'bar' within an image? I imagine >>> there must be, but I can't find it. >>> .... > There is a tool to automate a lot of this called the Refactoring Browser, > which many developers like, but I don't even have it in my image. > > - Bert - The Refactoring Browser is included in OmniBrowser You may load it by executing the following code snippet "Omnibrowser, including Refactoring engine" (Installer ss project: 'MetacelloRepository') install: 'ConfigurationOfOmniBrowser'. ((Smalltalk at: #ConfigurationOfOmniBrowser) project perform: #lastVersion) load: #( Dev ). This is from the Workspace 'Extending the system' which is in the 'Help' menu. It has menu choices like refactor --> search code refactor --> source regex Maybe somebody else can point you to the right direction when and how to apply this. HTH --Hannes

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Beginners September 2012