November 2017 - Pharo-users

Publishing a book with Pillar
by Stephane Ducasse Nov. 13, 2017

Nov. 13, 2017

Hi guys we are working on pillar and we will probably release a new alph version soon. I'm updating the doc. But I found that the doc I was writing can help some of you. Julien is written a nice booklet on USBdrivers and he told me that this doc works super well on mac. Stef

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Peeking at a stream
by Prof. Andrew P. Black Nov. 13, 2017

Nov. 13, 2017

I sometimes find, when working with a stream, that I need to "peek aheadâ a few items, without disturbing the state of the stream. The message stream peek gives me the next item, but doesnât generalize to multiple items, So I end up writing code like this: findSomething | savedPosition result | savedPosition := stream position. stream position: start. âcode involving various manipulations of stream, including stream next" result := stream position + 1. stream position: savedPosition. ^ result This code involves at least two temps, is not very easy to read, and risks not resetting the stream properly if I do a return. It seems to me that a better solution would be what Kent Beck calls an âexecute aroundâ method: findSomething ^ stream unchangedDuring: [ :s | âcode involving various manipulations of stream, including stream next" stream position + 1 ] Iâm not sure that I like the name #unchangedDuring:; perhaps you can think of a better one? The implementation of this would be PositionableStream >> #unchangedDuring: aBlock "execute aBlock with self as argument. Ensure that when this method returns, I still have my current state." | savedPosition | savedPosition := self position. ^ [ aBlock value: self ] ensure: [ self position: savedPosition ] or perhaps PositionableStream >> #unchangedDuring: aBlock "execute aBlock with self as argument. Ensure that when this method returns, I still have my current state." ^ [ aBlock value: self copy ] which might be better in the case that the stream is a file stream and aBlock causes the buffer to be refreshed from the disk. Do other Smalltalks have a method like this? Does it already exist in Pharo, somewhere that Iâve failed to look? Would it be a worthwhile addition to Pharo? What would be a good name?

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NeoJSON. Allowing null or an object
by Juraj Kubelka Nov. 13, 2017

Nov. 13, 2017

Hi, Please, how should I modify the mapping to be able to parse the following example? -=-=-=- rectangleJson := '{ "origin" : null, "corner" : null }'. (NeoJSONReader on: rectangleJson readStream) mapInstVarsFor: Point; for: Rectangle do: [ :mapping | (mapping mapInstVar: #origin) valueSchema: Point. (mapping mapInstVar: #corner) valueSchema: Point ]; nextAs: Rectangle. -=-=-=- I receive from a server JSON messages including null values. Can we say use Point value schema or null? How? In the documentation I can see the example: -=-=-=- String streamContents: [ :stream | (NeoJSONWriter on: stream) mapAllInstVarsFor: Point; writeNil: true; nextPut: Point new ]. -=-=-=- that produces {"x":null,"y":null} But I do not see how to apply this for the following example: -=-=-=- String streamContents: [ :stream | (NeoJSONWriter on: stream) mapAllInstVarsFor: Point; for: Rectangle do: [ :mapping | (mapping mapInstVar: #origin) valueSchema: Point. (mapping mapInstVar: #corner) valueSchema: Point ]; writeNil: true; nextPut: Rectangle new ]. -=-=-=- Thanks, Juraj

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RB refactoring rewrite variable to a symbol
by Peter UhnÃ¡k Nov. 13, 2017

Nov. 13, 2017

Hi, how can I rewrite a(n instance) variable to a symbol? E.g. [IN] something: aSomething something := aSomething [OUT] something: aSomething self write: aSomething into: #something I can capute the input just fine... ``@var := ``@arg but I have no idea how to convert the var into a symbol (or string). Thanks, Peter

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PharoLauncher directories
by stephan Nov. 13, 2017

Nov. 13, 2017

I run into all kinds of issues with the directory structure used by the new PharoLauncher. pharo-local seems to be shared now for multiple images. That makes using configurations practically impossible as they are not expecting to have to deal with pre-downloaded older and newer monticello files. The missing sources files is less of a problem. Stephan

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I18n in pharo
by ÐÐ¸ÐºÐµÐ½ÑÐ¸Ð¹ ÐÐ¾ÑÐ°Ð¿Ð¾Ð² Nov. 13, 2017

Nov. 13, 2017

Will Pharo 7 be ready for i18n of applications? I mean some simple and useful way like in Cincom Visual Works, where translation dictionaries are separated from code and could be dinamycally changed without changing my application. It is very important for huge commercial applications, especially with lots of UI forms, dialogs and user-messages. I transfer my code from Cincom VW (VW is not available now for Russia due to politic situation) to Pharo and is very interested in simple internationalization mechanism. I don't want to reinvent the wheel but sometimes it seems to me that pharo developers are forced to do it. By the way, the error i had last week with clean Pharo 6\Pharo 6.1 installation ("UTF8InvalidText: Invalid utf8 input detected" on image load - error caused by cyrillic path to application folder) didn't solved and i had no feedback from community. best regards, Vikenti Potapov.

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Re: [Pharo-users] Pharo-users Digest, Vol 55, Issue 94
by ÐÐ¸ÐºÐµÐ½ÑÐ¸Ð¹ ÐÐ¾ÑÐ°Ð¿Ð¾Ð² Nov. 12, 2017

Nov. 12, 2017

I want to get these esug videos, but i've searched through the whole pharo site and i haven't found them ... :( I appreciate if you point me where to find help on working with minimal image\deploying with Pharo. And i also think this very important information should be available on pharo site at conspicuous place. What about Dr.Geo - i've downloaded this program to test from official site (http://www.drgeo.eu/download#TOC-PC-Mac-GNU-Linux) I launched DrGeo.bat, as it noted in instruction. It shown me console window and Pharo command line options. That's all. It didn't start. I think, the reason is - also cyrillic paths, but ... who knows? And also i mean some simple and understandable deployment tool (as in Cincom VW exists) but not manual-written bash scripts. This tool asks me what class\accessor send open message, asks what to strip and how to pack my image. Few simple steps and i have perfectly cleaned minimal image with all image started methods tuned to load necessary class. It's really cool stuff. It's a pity, my low-level SmallTalk knowledge (VW + Pharo) is not enough to port this tool or create the new one. Please, understand me right, i don't criticize pharo, but i'm trying to understand what to do and how to do with less efforts for me. And these are the questions every developer asks. > On 11-11-17 18:58, ???????? ??????? wrote: > > Another stumbling block is application deployment. > > You want to start from a minimal image and load everything you need with > a Metacello baseline/configuration. And you want to change some settings > to run without sources. You will run into parts that are not modularized > enough yet and need their baselines to be split up further than they are > now. > > The minimal image is rather minimal. See the esug videos > > Stephan

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Soup bug(fix)
by Siemen Baader Nov. 12, 2017

Nov. 12, 2017

Hi all, who maintains Soup, the HTML parser? Stef? It seems to auto-close <button> (and <a>) tags when nested inside another element. I wrote this test that fails: testNestedButton "this works with nested <div> tags instead of <button> and when there is no enclosing <div> at all. but here <button> is auto-closed." "a does not work either" | soup | soup := Soup fromString: '<div><button> <span>text</span> </button> </div>'. self assert: soup div button span string equals: 'text' ---- Where should I look to prevent Soup from auto-closing the tag, and where & how should I submit my fix? cheers, Siemen

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Writing "powerpoint" like presentations in Pharo?
by Tim Mackinnon Nov. 12, 2017

Nov. 12, 2017

Hi - has anyone made anything where you can create a full screen presentation in Pharo with slides with some large text, bullet points and embedded pictures - but then itâs a facade that lets you evaluate items in the slide or jump to any code mentioned? Sort of like what Alan Kay does in the eToys images? I need to do a presentation next week and I always loved it when I was fooled into thinking I was looking at a staticâish powerpoint and then suddenly realised it was a live environment. It doesnât sound that hard to do something simple - but Iâm not sure if I can pull it off in time for my presentation. But am curious if we have something. (For bonus points, GT-Spotter stuff would work in it over top of the presentation to demonstrate simple things) Tim

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RewriteTool maintained?
by Peter UhnÃ¡k Nov. 12, 2017

Nov. 12, 2017

Hi, has Mark Rizun's Rewrite Tool been abandoned? Thanks, Peter

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