February 2009 - MacRuby-devel - lists.macosforge.org

high-performance macruby: llvm and trading apps
by Joel Reymont 18 Feb '09

18 Feb '09

I'm creating a Mac trading app, not unlike http://ninjatrader.com which is for Windows and uses .NET. I need a DSL for writing trading systems which would run every time a price quote is received over the network, a few times per second. This suggests compiling trading strategies to machine code, e.g. using LLVM on the backend. This would allow me to make use of vector processing, for example, to squeeze the maximum out of multiple CPU cores. I would also like a DSL to extend the app with new functionality, perhaps to build the GUI portion of the app itself. It doesn't seem that MacRuby in its present state is suitable for writing trading systems that run several times per second and use vector processing. I don't see a good alternative either. What would you folks suggest? How much work would it be to run MacRuby on top of LLVM? Thanks, Joel --- http://tinyco.de Mac Trading Apps

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accessing ruby objects from Objective-C
by S. Woodside 18 Feb '09

18 Feb '09

Hi, If you look at http://simonwoodside.com/weblog/2009/2/10/wondeful_joy_mix_ruby_and/ I describe calling ruby side objects from the ObjC side. I can make it work using dynamic classes but of course that generates compiler warnings (like no '-baz' method found). Of course it still works, but is there any way for my ObjC classes to know at compile time what are the class names and methods on the ruby classes? --simon -- http://simonwoodside.com

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Ruby/SDL bindings with MacRuby (Cocoa?)
by Timothy McDowell 16 Feb '09

16 Feb '09

Is it possible for me to use the Ruby/SDL bindings with MacRuby/Cocoa? Also, can Quartz handle movement of sprites (gifs, pngs, jpgs?) and the like? Would Quartz be just fine for game development? -- --Timothy.

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Apple's RoundTransparentWindow sample ported to MacRuby
by Matt Aimonetti 15 Feb '09

15 Feb '09

Hey guys, I felt the need to dive into an old Apple sample to understand how to do some advance window manipulation: http://developer.apple.com/samplecode/RoundTransparentWindow/index.html Porting the sample to MacRuby was pretty straight forward :) http://github.com/mattetti/macruby-roundtransparentwindow/tree/master Laurent, feel free to change the license and provide the example with MacRuby if you think that could help other developers. - Matt

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Memory allocation problem
by Dave Baldwin 14 Feb '09

14 Feb '09

Here is a simple test case to show the problem. macirb >> str = [10].pack('N').unpack('g')[0].to_s macruby(29176,0x7fff70513720) malloc: *** free() called with 0x8004a5c60 with refcount 0 macruby(29176,0x7fff70513720) malloc: reference count underflow for 0x8004a5c60, break on auto_refcount_underflow_error to debug. macruby(29176,0x7fff70513720) malloc: *** free() called with 0x8004a5c40 with refcount 0 macruby(29176,0x7fff70513720) malloc: reference count underflow for 0x8004a5c40, break on auto_refcount_underflow_error to debug. => "1.40129846432482e-44" macruby -v MacRuby version 0.4 (ruby 1.9.0 2008-06-03) [universal-darwin9.0, x86_64] Taken from trunk on 30 Jan 09. Dave.

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Bug: NSValueTransformer receivers NSCFNumber, not fixnum
by Brian Marick 14 Feb '09

14 Feb '09

Is this a bug? I don't see anything quite like it in Trac. I have a binding to a button's state property. Here's the binding: @comboBox.bind 'enabled', toObject: @button, withKeyPath: 'state', options: { NSValueTransformerBindingOption => OffStateMeansTrueTransformer.alloc.init } At the point the binding is made, the state of the button is a fixnum 0. The value transformer is immediately called to set the starting value. Here's the transformedValue code: def transformedValue(state) puts "state -> bool transforming #{state.inspect}" # prints #<NSCFNumber:0x1022180> # state.intValue is 0 Because of this, I have to cast the state before making comparisons: case state.intValue when NSOffState then true when NSOnState then false else raise "The value to transform should be either NSOffState or NSOnState." end If this is a bug, I'll write a testcase. ----- Brian Marick, independent consultant Mostly on agile methods with a testing slant www.exampler.com, www.exampler.com/blog, www.twitter.com/marick

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Another Cucumber Related Bug
by M. Scott Ford 14 Feb '09

14 Feb '09

Hello, The following block of code generates a segmentation fault. I am going to try to track down where it is coming from. Commenting out the args.extend line will prevent the failure. I am going to digg in and try to figure out what is wrong, but I thought that an extra pair of eyes would be nice. Especially since I have no idea where to start. :) Any tips? require 'optparse' args = [] args.extend(OptionParser::Arguable) args.clear -Scott

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µgem (notice I am using your Greek character!) question
by Tim Rand 13 Feb '09

13 Feb '09

Hi Matt, First of all, thank you so much for working on the gem issue with macruby. There is no more important work in the world, er universe, right now than this--I mean it, from the bottom of my frustrated-at-not-being-able-to-use-sqlite3-heart. I am hoping you could comment on why sqlite3-ruby seems to install, but still isn't functional. Here is how I did with my first try at using µgem. 1. Installing rake via µgem appears to have worked! (this is hard to verify because "require 'rake'" works in macirb even before installing with µgem). 2. Installing sqlite3 via µgem seems to have worked! (BUT "require 'sqlite3'" STILL FAILS in macirb). How do you test gems installed via µgem? Where do they install to? Does that path need to be added to the $: for macirb to find them? Sorry for the basic questions... Thanks, Tim Here is my terminal screen: Tim:~/Documents/References/Technical/Ruport Book and pics/microgem/bin> sudo ./µgem install rake [info] Installing `rake-0.8.3' Tim:~/Documents/References/Technical/Ruport Book and pics/microgem/bin> which rake /usr/bin/rake Tim:~/Documents/References/Technical/Ruport Book and pics/microgem/bin> macgem which rake /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.0/rake.rb Tim:~/Documents/References/Technical/Ruport Book and pics/microgem/bin> sudo ./µgem install sqlite3-ruby Password: [info] Installing `sqlite3-ruby-1.2.4' Tim:~/Documents/References/Technical/Ruport Book and pics/microgem/bin> macgem which sqlite3 Can't find sqlite3 Tim:~/Documents/References/Technical/Ruport Book and pics/microgem/bin> macgem which sqlite3-ruby Can't find sqlite3-ruby Tim:~/Documents/References/Technical/Ruport Book and pics/microgem/bin> macgem query --local *** LOCAL GEMS *** alloy-microgem (0.2.0)

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Help with bug from Cucumber codebase
by M. Scott Ford 12 Feb '09

12 Feb '09

Hello, I have been trying to get cucumber working with MacRuby, and I have run into a bug. I have tracked the source of it down to a block of code in cucumber's code base[BLOCK 1]. I have condensed this down to a much smaller example[BLOCK 2]. In ruby 1.9.1 the second block results in 'yellow,bold', but in macruby the second block results in nil. My guess is that there is a bug in the merge implementation or the constructor implementation. I am not familiar enough with ruby to know which, so I will take a look at both. I feel this should be added as a test case, but I am not sure where to put that, since I am new to the project. Any tips? -Scott ----- BLOCK 1 ---------- ALIASES = Hash.new do |h,k| if k.to_s =~ /(.*)_param/ h[$1] + ',bold' end end.merge({ 'missing' => 'yellow', 'pending' => 'yellow', 'failed' => 'red', 'passed' => 'green', 'outline' => 'cyan', 'skipped' => 'cyan', 'comment' => 'grey', 'tag' => 'blue' }) if ENV['CUCUMBER_COLORS'] # Example: export CUCUMBER_COLORS="passed=red:failed=yellow" ENV['CUCUMBER_COLORS'].split(':').each do |pair| a = pair.split('=') ALIASES[a[0]] = a[1] end end ALIASES.each do |method, color| unless method =~ /.*_param/ code = <<-EOF def #{method}(string=nil, &proc) #{ALIASES[method].split(",").join("(") + "(string, &proc" + ")" * ALIASES[method].split(",").length} end # This resets the colour to the non-param colour def #{method}_param(string=nil, &proc) #{ALIASES[method+'_param'].split(",").join("(") + "(string, &proc" + ")" * ALIASES[method+'_param'].split(",").length} + #{ALIASES[method].split(",").join(' + ')} end EOF eval(code) end end -------------- END BLOCK 1 -------------- ------- BLOCK 2 ------------------ ALIASES = Hash.new do |h,k| if k.to_s =~ /(.*)_param/ h[$1] + ',bold' end end.merge({ 'missing' => 'yellow' }) puts ALIASES['missing_param'] --------- END BLOCK 2 ---------

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Hot Cocoa disappearing window behaviour
by Dave Baldwin 12 Feb '09

12 Feb '09

It seams like the default behaviour of windows generated in Hot Cocoa is to allow their content height to be shrunk to zero (by dragging the lower right corner). At which time you are left with just the title bar and no way to recover once you have released the mouse button (AFAIK). A minimum width is already provided. layout_view demonstrates this behaviour. It is probably a good idea to set a minimum height value by default. Dave.

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