apeiros_ changed the topic of #ruby to: Ruby 1.9.3-p286: http://ruby-lang.org || Paste >3 lines of text on http://gist.github.com
<zastern> I make too many typos for irb to be that useful :)
<Spooner> Its main benefit for you would be code highlighting (colour) and being able to easily look up documentation.
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<zastern> ehh.
<zastern> What I have found useful though, is the debugger, for working through errors
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<Spooner> I never use it. Nothing wrong with old fashioned debugging with p (well, that and proper tests, o fcourse).
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<waxjar> there was this new debugging library called letters that was very interesting
<davidcelis> Kernel#puts and pry are enough for me
<waxjar> i like to use it to make the terminal beep :D
<zastern> Thank god for the inventor of the visual terminal bell.
<zastern> Whoever that was.
<Spooner> waxjar : I like the idea of having #o so I can get output in the middle of a pipe.
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<RubyPanther> Well, before you worry about debugging tools, why are you debugging in the first place? Is it to find out what happens when you do something, or to find out what is happening in your code?
<RubyPanther> If you're doing modern testing, you should use that to find out what is happening
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<jrajav> RubyPanther: You thinking testing is a substitute for debugging?
<RubyPanther> No, I think testing tells people (who do it) what their code does.
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<waxjar> i find i mostly use tests to verify that changes i made don't break stuff
<RubyPanther> So they only should need a debugger when they don't know what something would do, to try things out
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<Spooner> And if it tells you that, that is great, but it doesn't help you fix it (beyond pointing you at a single or group of faulty methods).
<jrajav> Call me crazy, but they can also be useful to, you know, DEBUG
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<jrajav> You can't test for a bug that you don't know the origin of
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<RubyPanther> If your methods are small and you have good coverage, it is hard to have a bug and not be able to trace it through the tests, to isolate
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<RubyPanther> But print statement style debugging does the same thing, tells you where the bug is. So if you're using that, you also don't need the debugger for information about bugs. Just for experimenting.
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<RubyPanther> So between people who do modern testing and people who print-debug, I figure that is most people.
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<ddd> being able to step through execution 1 line at a time and check vars and see what exact lines were called etc has been a great aid, in *addition* to writing tests to make sure A) i didn't break something i did earlier, and B) it does what I expect. They alert me when there's a problem, and the debugger helps me figure it out.
<ddd> it *also* works as a great tool for testing things out and poking at things.
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<ddd> being able to step through the stack and through exceptions and seeing what was looking like what at the time of the exception is also a great tool
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<ddd> being able to set breakpoints and execute up to them and then slowly step through the problem area has helped me in more than one occasion. (also helps me not have to clean up the damned p and puts afterwards hehe)
<shadewind> what's the best way to get the filename component of a path without opening the file? using hte File class seems to require opening the file
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<ddd> File.basename(__FILE__) iirc
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<shadewind> ddd: I'm so stupid... I should really have seen that the basename method is not an instance method :)
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<zastern> I feel like this would be a lot easier if I understood C and could read the source of the things I'm looking up :(
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<shadewind> ddd: right. Is there an instance method equivalent?
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<ddd> not that I know of
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<zastern> When the ruby docs talk about "ios", what exactly do they mean? Output?
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<shadewind> ddd: I'm a bit new to the docs... is :: for class methods and # for instance methods?
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<ddd> no :: is a delimiter. like Module::Class#method .method is usually for instances
<ddd> vs #method for methods on a class
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<ryanf> the opposite of what ddd said
<ryanf> you were right the first time shadewind
<ddd> err?
<ryanf> although sometimes people use . instead of ::
<ryanf> ddd: "is :: for class methods and # for instance methods?
<ryanf> "
<ryanf> the answer to that question is "yes"
<ryanf> . can be used instead of :: for class methods, but # is always for instance methods
<ddd> That would mean it would be File::basename
<ryanf> yes
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<ryanf> personally I like the . notation better for class methods, but people do use :: for that
<Spaceghostc2c> You can use . or :: for class methods.
<shadewind> ryanf: sure, but the docs seem to list class methods with the :: prefix in the left column
<Spaceghostc2c> ::Module::class_method or ::Module.class_method
<ryanf> yes, that's correct shadewind
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<Spaceghostc2c> The leading :: isn't necessary.
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<ddd> ok I stand correct.
<ddd> err corrected
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<ddd> my bad
<ddd> (went to play with ri for a second. ri responds as you depict)
<shadewind> anyway... a module is essentially a class which cannot be instantiated?
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<ddd> shadewind: my apologies :)
<shadewind> I get that they are used for completely different things
<shadewind> ddd: no problem, we all make mistakes :)
<Spooner> shadewind : On a very basic level, yes, but a module is used either as a namespace or for extending classes as a sort of multiple inheritance.
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<shadewind> Spooner: yes I get that they have entirely different purposes, I'm talking about the technical details
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<shadewind> that is, a module is used as a namespace for a library et.c.
<ryanf> yes
<ryanf> class inherits from module
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<ryanf> i.e., the Class class inherits from the Module class
<shadewind> I see
<shadewind> right
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<shadewind> which means that a non-instance method is technically the same as a class method in a class
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<zastern> What's the difference between a method named like ::this or like #this ?
<Spooner> Yes, technically.
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<shadewind> and to repeat, I understand that they are different things conceptually (which is clear from the names "module" and "class")
<Spooner> We just discussed that. Foo::bar or Foo.bar refers to a class/module method, whcih is called on the module/class directly in either of those ways.
<Spooner> However, Foo#bar is available on the instance e.g. foo = Foo.new; foo.bar
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<zastern> That doesn't mean much to me right now, but hopefully it will soon
<Spooner> In the case of modules, Foo#bar would only be available if that module was included in a class that was instantiated.
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<Spooner> zastern : Yeah, the class/instance/module trinity takes a bit of a leap of faith, but soon becomes second nature.
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<zastern> Spooner: I think the issue is that LRTHW focuses on "doing things" and not understanding the semantics of what those things "actually are".
<shadewind> # isn't a real operator, is it?
<Spooner> Nope.
<shadewind> just something used in the docs to signify instance methods?
<Spooner> It is just documentation (meaning use . on an instance, rather than . or :: on a class/module).
<shadewind> right
<Spooner> zastern : exercise 40 does discuss these relationships.
<zastern> Spooner: heh im only on 20 right now, and it's pretty damn confusing
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<zastern> e.g. I can't really wrap my head around seek. I sort of get what it does, but I don't quite understand "why"
<shadewind> the syntax "def self.foobar(arg)" seems like a special case of defining a "singleton method" as described in Ruby User's Guide
<shadewind> inside a class 'self' means the class object
<Spooner> Yeah, we generally do: class << self; def foobar(arg)...end; def foochicken(arg)...end;end to do the same thing.
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<shadewind> Spooner: hmm... could you elaborate on that?
<Spooner> And yes, shadewind, the self there refers to the class itself, since it is inside its scope that it is being run (no instances exist at that point).
<Spooner> shadewind : "class << self; def foobar(arg)...end; end" is the same as "def self.foobar(arg)...end;"
<shadewind> Spooner: right
<shadewind> what does the << operator do?
<Spooner> It does what you want it to, but generally means add or append.
<shadewind> by "what you want it to", you mean that it can be defined using def <<(blah) et.c.
<shadewind> ?
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<Spooner> What it actually does in this case is to allow you to access the class's metaclass within class << self ... end - any instance methods added to that class act like class methods on the main class. Advanced topic. Just accept it for now ;)
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<shadewind> Spooner: I see. saves me from typing self.blah
<Spooner> Yes, << is just accessing a method.
<Spooner> It also allows you to do a lot of other things directly on the metaclass, that you can't do otherwise.
<shadewind> somehow, operator overloading in ruby doesn't make me want to throw up as much as operator overloading in C++ does
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<Spooner> As I understand it, there is no such thing, per se, as a class method. It is really an instance method on that class's metaclass.
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<shadewind> Spooner: just like in Objective-C then
<Spooner> I wouldn't know.
<shadewind> sort of
<shadewind> Spooner: but "class" in this context is some sort of special (or non-special?) variable then?
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<Spooner> shadewind : One thing you need to beware of, if you are used to C++ overloading, is that += is purely syntactic sugar. It isn't an operator (it just resolves as a = a + b).
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<shadewind> Spooner: makes sens
<shadewind> Spooner: so what I'd want to define in that case is +(rhs) and not +=(rhs)
<Spooner> class is a keyword. I honestly don't know what magic is involved in mixing an operator with a keyword in "class << self", but someone might.
<shadewind> :)
<Spooner> Yes. This is also why we use string << "frog" and array << 2 rather than using +=, since the latter creates a new String/Array.
<Spooner> Whereas in C++, you'd be able to append-in-place using +=
<shadewind> in C++ you be able to do all sorts of crazy shit
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<Spooner> Ruby is all about crazy shit too. Just not as painful crazy shit.
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<shadewind> Spooner: not quite as ugly crazy shit
<Spooner> Yeah, that too ;)
<shadewind> and I'm not saying that because I find C++ too hard
<shadewind> I regularly use C++ for production work
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<shadewind> I just don't happen to find it very nice
<shadewind> although useful
<felipec> is there a shorter way to do this? array.group_by { |e| e[:id] }
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<Spooner> I don't like C++ too much. I have started using C again to do Ruby extensions though. I can almost palate it in that limited context.
<felipec> I would like to do something like array.group_by(&:id)
<shadewind> C is beautiful in its simplicity
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<Spooner> felipe : Nope, don't think so.
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<Spooner> felipe : Add an #id to whatever is in the array if it worries you enough.
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<harushimo> what is the class eval method do?
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<Spooner> Evaluates code in the context of the class/module.
<harushimo> quick example. I'm also looking at the ruby docs
<harushimo> I'm just curious
<harushimo> the program I'm writing uses it. I got some skeleton code for one function and I'm working on the other one
<Spooner> class C; end; C.class_eval "self" #=> C
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<harushimo> ok
<Spooner> The program you are writing uses it? How do you know you need it if you don't know what it does?
<harushimo> it was my in skeleton code
<Spooner> Oh, you were given code to start you off? I see.
<harushimo> I didn't understand what method was doing
<harushimo> it was in this skeleton code
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<harushimo> the code doesn't work
<harushimo> I'm debugging it right now
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<harushimo> give me some time. I do have some questions on it
<harushimo> i want to look it over.
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<harushimo> Spooner: thank you for helping me
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<werdnativ> Using capistano, I want to `tar` some files to a string and pass it to the put command for uploading. Is there a way to use IO.popen or StringIO, etc. to get this input in a streaming way?
<harushimo> you've been correcting me along the way. I'm getting somewhat better ruby
<harushimo> i'm not there yet
<Spooner> I'd only be sleeping if I didn't and who wants that?
<harushimo> i just took a nice long nap
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<Trioke> Spooner: Sleeeeep! A elusive creature. Almost... mythical ;).
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<Spooner> harushimo : Not sure why they suggest using class_eval(string) when you can use class_eval do...end
<harushimo> its becuase of the test case on the bottome
<harushimo> I mean bottom
<Spooner> No, I mean it is horrid to eval a string, when you can write the code in a block.
<harushimo> this should return [nil, 1, 2]
<harushimo> oh okay
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<harushimo> when I try running it, this gives me some errors
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<Spooner> Errors are part of the game.
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<harushimo> I know
<harushimo> that is why I'm debugging
<harushimo> hehe
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<Spooner> harushimo : I really can't see how it is possible to do what is required *if you use the provided code*
<fbernier> is there a way to check if a class is part of a module?
<fbernier> even with multiple levels
<Spooner> A specific module or to find out which module it is in?
<fbernier> a specific
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<ddd> you could check .parent.class
<Spooner> ddd, not superclass, but namespace.
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<ddd> like I have module Dtf ; module Session ; class Environment so if I run Dtf::Session::Environment.parent.class it says module (which is its)
<fbernier> I have an instance of Feedzirra::Parser::RSS, and I want to check if it's part of Feedzira
<Spooner> fbernier : You have to play with the name string, which is painfully dumb, but it is the only way. E.g. klass.name.split("::").first == my_module.name
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<Spooner> ddd No, that isn't what you are getting. Dtf::Session::Environment.parent is Class and its class is module (Class is a subclass of Module). Nothing to do with Dtf or Session.
<fbernier> ok so something like this: instance.class.name.split('::').include? 'Feedzirra'
<ddd> err?
<fbernier> thanks Spooner
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<ddd> Spooner: [99] pry(main)> Dtf::Session::Environment.parent
<ddd> => Dtf::Session
<Spooner> fbernier : Not strictly, since that would match Fish::Feedzirra::Wombat too. In this case you can get away with it though.
<fbernier> yeah ..
<ddd> add class to that and it comes back Module
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<Spooner> ddd No, that is following inheritance, not namespacing.
<Spooner> Actually no, #parent isn't Ruby, it is just a method that object happens to provide ;) You are confusing me.
<ddd> Spooner: OK, didn't realize it was namespace he wanted. He said (or I took it to mean) something like @my_feed = Feedzirra::Parser::RSS and he wanted to find out if it was part of Feedzirra. which @my_feed.class.parent.to_s('Feedzirra') would do
<ddd> err
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<ddd> @my_feed.class.parent.to_s.include?('Feedzirra')
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<ddd> or parents in that case
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<ddd> so I thought he wanted to check the inheritence path. my bad
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<Spooner> ddd There is no #parent in Ruby. You are thinking of superclass.
<ddd> Spooner: err then how am I calling it?
<Spooner> Because you aren't using vanilla Ruby?
<ddd> how am I not? Ruby 1.9.3-p286
<ddd> ruby 1.9.3p286 (2012-10-12 revision 37165)
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<Spooner> With no gems loaded?
<ddd> yes I have gems loaded.
<ddd> so does he :)
<ddd> ok so how do I track down *which* gem is giving me that method
<Spooner> So it isn't vanilla Ruby ;) Class.superclass does it normally. I am guessing someone else gavbe you #parent.
<Spooner> If you have pry, you could use show-source Class.parent and that should tell you which file it is in.
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<ddd> yeah i use pry. sec
<Spooner> I'm curious where it is. Having #parent as an alias for #superclass seems unnecessary and sounds like Rails evil ;D
<ddd> active_support
<Spooner> Aha! Close enough :D
<ddd> ctivesupport-3.2.8/lib/active_support/core_ext/module/introspection.rb @ line 7 for parent_name ctivesupport-3.2.8/lib/active_support/core_ext/module/introspection.rb @ line 30 for parent
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<ddd> Spooner: thank you for setting me straight.
<Spooner> You had me doubting for a minute there!
<ddd> i thought you were nuts actually ;)
<ddd> but I'm a big enough boy to take being wrong. you schooled me, for which I'm happy
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<Spooner> I suspect it is quite hard to separate vanilla from activesupport, if you use Rails a lot.
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<ddd> not using rails. using activerecord with some of the support modules. (yes you can use AR with non rails apps :))
<Spooner> I know, I have, but 99% of AR is Rails.
<ddd> this is a PORA I'm writing
<Spooner> *99% of AR usage is Rails.
<ddd> yeah, i'd argue the statistics but damned close enough it'd be nitpicking :)
<Spooner> PORA?
<ddd> Plain Old Ruby Application
<ddd> family to PORO Plain Old Ruby Object
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<ddd> of course, people could argue there is no such thing as a ruby 'application' as its a scripting language, however, thats splitting hairs methinks
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<Spooner> I have no problem with application.
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<RubyPanther> it is splitting fake hairs
<ddd> i did get into ruby because of rails (rails was becoming big and i'd heard of ruby but never used it, rails seemed 'special' so i checked it out. took me *directly* to writing straight ruby though using some of the paradigms from rails-land like app/models etc.
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<ddd> now i'm coding ruby gems, and yes, rails's apps/models has infiltrated there too for me :) i have to write a special line but i do like that layout, personally.
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<RubyPanther> even if that was a real distinction, okay in C then... #include "ruby/ruby.h" \n ruby_init(); \n rb_load_file("application.rb")
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<RubyPanther> You can code in C and treat the Ruby interpreter as your stdlib, at the extreme
<Spaceghostc2c> RubyPanther: Is that even close to the right syntax? :D
<Spooner> You could also argue that Ruby is the application and you are thus not creating the application.
<RubyPanther> My syntax was capable of strict parsing, I do believe.
<Spaceghostc2c> RubyPanther: I mean, does it do what I'd expect?
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<RubyPanther> Spaceghostc2c: Sure. And instead of rb_load_file you can use rb_require, though if you want something from rubygems you'll have to resort to rb_funcall(rb_cObject, rb_intern("require"), 1, rb_str_new2("bundler") );
<Spaceghostc2c> RubyPanther: That's kind of cool.
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<RubyPanther> Spaceghostc2c: it is nice, all the Ruby tools and C tools at your fingertips mixed together
<Spaceghostc2c> RubyPanther: That's pretty hawt, for sure.
<Spaceghostc2c> If I knew C well, I'd tackle that shit. Good on you.
<Spaceghostc2c> I'm a bit more comfortable with java, as horrible as that sounds.
<RubyPanther> In Perl you have to navigate XS hell before you're allowed to talk directly from C
<RubyPanther> I haven't done more than Hello World in Java, if I ever end up with one of those old Java thin clients then I'll think about it.
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<RubyPanther> What we need is an mRuby thin client.
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<Spaceghostc2c> RubyPanther: I guess one cool thing about the jvm is the number of opcodes is so small.
<RubyPanther> RiteVM is small enough you can easily just sit down and write bytecode like it was ASM.
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<Spaceghostc2c> That's a ruby vm?
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<RubyPanther> Yeah, that's the VM for mRuby.
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<Spaceghostc2c> Oh!
<Spaceghostc2c> RubyPanther: Do you use rvm or something else?
<RubyPanther> Originally it was Matz's lightweight replacement for 1.8, but YARV is more advanced and was a better choice for the mail interpreter so Rite got pushed down to embedded support
<RubyPanther> Spaceghostc2c: I'm using rbenv and loving it
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<RubyPanther> "main interpreter"
<Spaceghostc2c> I've got to work on a quick little server to serve up directory indexes really quickly.
<Spaceghostc2c> Some prat is writing one in asm.
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<tomoyuki28jp> How can I install 'net/http'? Is it better to use open-uri instead?
<waxjar> net/http is part of the standard library, you can just require it
<tomoyuki28jp> waxjar: require 'net/http' => false
<RubyPanther> tomoyuki28jp: just use open-uri unless you have a reason to need something else
<tomoyuki28jp> waxjar: on rails console
<waxjar> that's weird
<Spooner> tomoyuki28jp : false just means it is already loaded, so it doesn't load again. It would raise LoadError if it hadn't loaded.
<tomoyuki28jp> Spooner: NameError: undefined local variable or method `http' for main:Object
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<Spooner> That implies you aren't putting it in quotes.
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<tomoyuki28jp> Spooner: no I don't quote http
<Spooner> No, I am misreading what you pasted.
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<Spooner> You don't get a global #http method if you load net/http
<waxjar> tomoyuki28jp: see http://www.ruby-doc.org/stdlib-1.9.3/ for usage
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<tomoyuki28jp> ah, I think I should use Net::HTTP instead.
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<Pip> Any good Ruby tutorial for beginners?
<waxjar> ugh, frames and url copying :s
<Spooner> Frames are for noobs.
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<waxjar> yea, i wish they'd fix that
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<eindoofus> hi, I'm going through a ruby book and using windows at the moment and I forgot what command to launch to use simple ruby commands in the ruby command prompt lie "a=1" "a=2" "a+b"
<eindoofus> btw, it's strangly quiet in here... is it because it's Saturday?
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<Spooner> eindoofus : Depends if people are asking questions. Just a momentary lull.
<Spooner> And the command is "irb"
<eindoofus> I see.
<eindoofus> thanks :)
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<eindoofus> also, is there a way to wait at the end of a ruby program so that the console window doesn't close?
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<Spooner> eindoofus : Yeah, run it from a cmd window. Don't run it by clicking on the file.
<Spooner> Though if you must, you could use "gets" to force the user to press return.
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<eindoofus> thanks
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<eindoofus> sorry, last thing. what indent style do ruby/rails developers typically use?: http://en.wikipedia.org/wiki/Indent_style
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<Spooner> 2-space - no hard tabs.
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<Spooner> Er, do...end for multi-line blocks and {...} for single-line blocks (so you don't have to worry about { on newline or not).
<eindoofus> oh
<eindoofus> I forgot about do, end. I'm brand spanking new to this. lol
<Spooner> Just read a bit of code.
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<Nautilus> I'm on ubuntu 12.04 and want to setup a sass/compass dev env, in synaptic I see libcompass-ruby and libcompass-ruby1.8 ... why two? How to decide what to do?
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<Spooner> Nautilus : At a guess, the 1.8 version is to support the old version and the other is the currently developed version (for 1.9).
<Spooner> Depends which Ruby you are using.
<Spooner> Which you want, that is.
<n_blownapart> hi how and where (on which line) is the array created in the first of these two examples? the second example apparently does not create an array. thanks you: http://pastie.org/5055432
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<Spooner> n_blownapart : The only arrays there are fields.
<Nautilus> Spooner: and if I install the 1.8 I'm guessing it won't auto-upgrade, while the other one would?
<Spooner> There are compatibility issues between the two Ruby versions, so I'd guess not.
<Nautilus> oh, I see. So I'm back to How to decide what to do?
<Spooner> As I say, it depends which Ruby you are using.
<n_blownapart> Spooner: I tried puts fields.class and got an error. sorry not sure why or how i can check in a case like this.
<Nautilus> far as I know, none
<Spooner> Oh, use 1.9.3 then ;)
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<Nautilus> and that should be fine for U12.04, sass/compass dev env? I suspect so but get twitchy when installing things I dont understand yet
<Spooner> n_blownapart : Both examples are actually the same. Only the latter one is a bit more wordy.
<swarley> hi
<Nautilus> Spooner: ^
<n_blownapart> Spooner: hmm. the books says " no intermediate array is created on the second example. The File object 'does its own work.' "
<Spooner> Nautilus : Yeah, 1.9.3 is fine. 1.8.7 is probably the one you get if you just install "ruby" but is nearing end of life ;)
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<Nautilus> Spooner: hm, i don't have a specific "1.9.3" option, it's libcompass-ruby and libcompass-ruby1.
<Spooner> n_blownapart : Hmm, I suppose then that readlines() generates an array. Yeah.
<Nautilus> 1.8*
<Spooner> Nautilus : Oh, I see. I hadn't thought that it _included_ ruby. Sorry.
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<n_blownapart> Spooner: thanks ! but in this case there is no way to view it with #class . Is intermediate another way to say 'implicit'.?
<Spooner> http://packages.debian.org/sid/ruby-compass the first dep is the actual ruby.
<Nautilus> head+desk. all this for a text processor
<Nautilus> (no fault of ruby, just... head+desk)
<Spooner> Most people work the other way around. They install stuff for Ruby, not Ruby as part of stuff. Sorry, I was confused.
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<Nautilus> gotcha. Yea, just trying to setup a sass/compass environment
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<Nautilus> so i should probably do it the other way around and that means I probably have even more Q's
<Spooner> Well, I'd recommend installing the ruby1.9.1 package (it says that, but probably means 1.9.3 for arcane reasons).
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<n_blownapart> anyone, is 'intermediate' and 'implicit' array synonymous? Spooner
<Spooner> n_blownapart : Yes, it is generating an array, which I would say was intermediate, rather than implicit.
<Spooner> n_blownapart : You can "prove" it with File.readlines("members.txt").tap{|a| p a.class }.inject(0)
<Spooner> Or just doing: p File.readlines("members.txt").class
<n_blownapart> Spooner: whoa that is a mouthfull. will check it out. thanks !
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<Spooner> Nautilus : No idea. The more usual way to install Ruby on Linux is via RVM or rbenv rather than via package manager, though you only really need to do it that way if you want multiple versions at once, which I doubt you do.
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<Nautilus> correct, just one version. I'm using synaptic just because I find it easier to search for packages, then usually install with apt-get
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<Nautilus> i see 1.9.1-full, 1.8, 1.9.3, but only 1.8 has the ubuntu logo next to it (maybe that means its in the default repo)
<thmzlt> Nautilus: is that 12.04?
<Nautilus> yes
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<thmzlt> there's ruby 1.9.3 in there
<Nautilus> ^
<thmzlt> that's probably what you're looking for
<Nautilus> any idea why some packages have the U logo next to it?
<thmzlt> not really, I use ubuntu server edition
<Spooner> thmzlt Yeah, but not sure if compass wants that (when used as a package).
<Nautilus> gotcha
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<thmzlt> Spooner: sorry, I got the conversation in the middle
<Spooner> But I'm really beyond my experience. I'd just install libcompass-ruby and see what it installed for me.
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<Nautilus> parsing 'what it installed' is beyond my experience too.
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<Spooner> Good point. Specifically which Ruby version is what I meant.
<thmzlt> if you aren't using ruby directly, I'd say just go with whatever apt does
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<Nautilus> is it something I can undo reasonably easy?
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<Spooner> You can just right-click in synaptic and "mark for complete removal".
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<Nautilus> ok, how's this look for syntax? "sudo apt-get install libcompass-ruby" ... thanks for hanging in while I'm pedantic about this
<Spooner> Anyway, good luck ;) I'm to bed. And yeah, that looks right to me.
<Nautilus> thanks a bunch
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<synthetix> hey guys
<synthetix> when i type :! irb -r % in vim
<synthetix> i've got following message
<synthetix> /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require':LoadError: cannot load such file
<synthetix> i understood smth with a path
<synthetix> where do i need to change it ?
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<Nautilus> now that I have libcompass-ruby installed, I typed "compass" and didn't expect it to do much without additional command info, what I get is ... `select_appropriate_command_line_ui': uninitialized constant Compass::Exec::Helpers::Haml (NameError) what's that mean to me?
<Nautilus> though I suppose that's for the compass channel
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<Nautilus> thanks for the help, got a good bit done. nites
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<AlecTaylor> hi
<eindoofus> Hi, I just followed along with the following code in my book: http://pastie.org/5055603 and I' wondering whether it's supposed to work for 1.9.3? I'm not getting the output => "catdog"
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<AlecTaylor> What's wrong with my function? `def palindrome?(str) return str==str.reverse end`
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<RubyPanther> AlecTaylor: maybe you need a newline or a ; after the the method declaration
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<AlecTaylor> RubyPanther: I have all that
<RubyPanther> AlecTaylor: maybe you need to massage your input, soften it up a little
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<AlecTaylor> RubyPanther: eh
<RubyPanther> THat's as good a hint as I'm gonna give but it is a good one
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<Ivo> what docs do I need to look at to find out about "#{attr}=" methods?
<Ivo> i.e creating custom attr readers and writers
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<Mon_Ouie> def foo=(bar); end are just regular methods, there's nothing special about writing one
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<Mon_Ouie> They just get a special syntax with which they are evaluated to the rhs, regardless of their return values
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<vedic> Probably I am asking a very simple question to Project Managers/Developers/Admins. I am looking for opinion on "Where do you prefer setting up version control repository for your project source code?" At your own premise or at hosting provider or colocate your server at hosting provider?
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<Spaceghostc2c> vedic: Git doesn't need a central server.
<Spaceghostc2c> It's a DVCS.
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<Ivo> Submitted to grader.
<Ivo> Submitted to grader.
<Ivo> I'm wondering if there's a nicer syntax to do what I'm doing here? https://gist.github.com/3887650
<vedic> Spaceghost2c: My question is not able version control per say. I am asking about the what practice you follow. Hosting the version control at any one server in premise or at hosting provider (like VPS) or colocate your own server at hosting provider? Lets say there 10 members in a project and alll need access to repository to push their part and pull from what others have done. So at least the one location must get all the pushes to get propogated to all other
<Ivo> Spaceghostc2c: but practically every project has some sort of canonical repo, which is a symbolic central server though
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<Spaceghostc2c> Ivo: I can't speak for other people's bad decisions. You can use the gatekeeper repo or the golden repo, but you don't need it.
<Ivo> vedic: both github and bitbucket provide excellent private services, and they *need* to stay up, or a shitstorm will occur
<Spaceghostc2c> vedic: There are many models that allow for that.
<vedic> Spaceghostc2c: And with bug tracking
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<Spaceghostc2c> But lots of people tend to treat git like a typical VCS and it makes me sad.
<Spaceghostc2c> vedic: What does that have to do with it?
<vedic> Ivo: I got it. So it is considered normal to share the critical code at bitbucket
<Ivo> vedic: you pay for a private account, which means you don't have to share it with everyone
<Ivo> gitorious is the other big one
<Spaceghostc2c> Isn't there some gitlab thingy?
<Ivo> yeah, but who's server is better tested? github, or gitlab?
<Spaceghostc2c> It shouldn't fucking matter. :)
<Ivo> Spaceghostc2c: shouldn't, but does. People want reliability
<Spaceghostc2c> Ivo: Git, bruv.
<Spaceghostc2c> Git.
<Ivo> I don
<Ivo> I don't follow
<Spaceghostc2c> Most people don't.
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<Spaceghostc2c> It is insanely hilarious when people say "I can't work, github is down"
<Ivo> well that's just stupid
<Spaceghostc2c> Like, I literally explode with laughter.
<Spaceghostc2c> It gets awkward after I finish laughing.
<Ivo> those people literally don't understand dcvs
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<Ivo> it's perfectly fine to use git in a cvs model, and is only enhanced by the fact that you can fall back to a dcvs model if your central server goes down
<Spaceghostc2c> I guess.
<Spaceghostc2c> But I suppose it's more acceptable to me when you know git properly.
<Ivo> I don't think I'm learning ruby properly...
<Ivo> oh well
<Spaceghostc2c> It's okay!
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<Ivo> that's reassuring, Spaceghostc2c. Thanks
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<profx_> im getting stuck lots learning Ruby as well
<profx_> it isn't for everyone, thats for sure
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<profx_> what is class_eval ?
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<Mon_Ouie> A method that runs a block in a context where self is the class you call it on, and where methods that are defined within that block will be added as instance methods to the class
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<Mon_Ouie> (It can also be used to evaluate strings, but it's more common to use blocks with that one, mostly because string-based evals are avoided like the plague)
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<profx_> i really wish I knew what every word of that meant
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<Spaceghostc2c> profx_: It's mostly technobabble.
<profx_> what does 'where self is the class you call it on' mean ?
<profx_> Spaceghostc2c: that still doesn't help
<Mon_Ouie> Foo.class_eval { self } == Foo
<profx_> what is foo ?
<Mon_Ouie> Foo.class_eval { def bar; end }; Foo.method_defined? :bar
<Mon_Ouie> A class
<profx_> ok, so to understand class_eval you need just one class ?
<Mon_Ouie> Well, you need a class to be able to use it (or a module, since it actually works on modules too despite the name)
<profx_> lets not talk modules
<profx_> it is difficult enough to understand on its own
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<profx_> so you need more than one class to understand it ?
<Mon_Ouie> I'm not sure what you mean by that
<profx_> sorry, at this point I have a really hard time 'reading' between the lines
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<Mon_Ouie> What could be "needed" to understand it?
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<profx_> ok, sure
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<profx_> so, you gave an example, in layman's terms, using that single example can you explain what it is doing ?
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<profx_> well, it seems you wrote two examples
<Mon_Ouie> They just show two of the things that hold true when you use class_eval with a block
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<profx_> so I guess its hard to determine which of the two I am discussing, so ill choose the simpler one "Foo.class_eval { self } == Foo"
<Mon_Ouie> self is the receiver of the #class_eval method (the thing you call it on), and methods are defined on that object
<profx_> sorry, that just looks like blah, blah, blah to me
<profx_> over my head
<profx_> are you explaining class_eval or self ?
<Mon_Ouie> class_eval. I assumed you knew what self was.
<profx_> well, it starts with "self is"
<profx_> so I wasn't sure
<Mon_Ouie> self is the current object. When you do "some_method" (as opposed to an_object.some_method), it is called on self
<profx_> and again
<Mon_Ouie> "self is" as in "Within the block, self is set to"
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<profx_> so your still explaining self to me then ?
<profx_> i see we aren't getting far
<Mon_Ouie> Only in the line that says it's the current object
<profx_> ill try later, thanks
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<negev> how do you set an object property based on a variable, eg obj.{key} = "foo" ?
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<profx_> how can I find if a method was released in a certain version of ruby ?
<Mon_Ouie> obj.send("#{key}=", "foo")
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<negev> thanks
<Mon_Ouie> profx_: I think the closest thing to that is scanning the log files in the SVN repo for the method's name — it's not indicated in the documentation
<profx_> lol
<profx_> ok, thanks
<Mon_Ouie> (If you want to check that for #cass_eval, it's going to be a *long* time ago :p)
<profx_> sure
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<qubit> does ruby have a way to assign to multiple elements of a hash in one operation? Like in perl I can do `@hash{'foo','bar'} = (1,2)` and %hash will be { foo => 1, bar => 2 }
<Mon_Ouie> No. You could zip over the keys and the values (as arrays) and do each update separately though.
<Mon_Ouie> Well, we do have Hash#merge though, depending on what you're looking for.
<Mon_Ouie> a_hash.merge("foo" => 1, "bar" => 2)
<profx_> i get undefined method in 1.8 and 1.9 for yeild
<Mon_Ouie> It's spelt "yield"
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<profx_> sure, my mistake
<Mon_Ouie> And most of the time it's used as a keyword, not a method
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<profx_> each { |y| yield [x, y] }
<profx_> in `each': undefined method `yeild'
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<Mon_Ouie> You did misspel it according to that error
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<profx_> saw that after I posted it
<Mon_Ouie> misspell*, quite ironically :p
<qubit> Mon_Ouie: ya, merge wont do it unfortunately. I'll just iterate over each :-(
<qubit> thanks for the info though :-)
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<profx_> array = ['ab','bc','ba'] array2 = [ [0,2], [1] ]
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<profx_> i want to replace in array2, the index of array with array[value]
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<profx_> but im not sure how to iterate over array2
<profx_> as its an array of arrays
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<Mon_Ouie> It's nothing special. As far as Ruby is concerned, an Array is a regular object too. You can still just use #each.
<profx_> but I want to keep the structure of array2
<Mon_Ouie> Oh, maybe you want to iterate recursively?
<profx_> ugh
<Mon_Ouie> If you know there will always be two levels of nesting, just nest two loops
<profx_> that word gives me shivers down my spine
<profx_> yes, nesting would be preferred
<profx_> i just wasnt sure if that was elegant enough
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<Spaceghostc2c> profx_: Your words excite me in a most innapropriate way.
<profx_> Spaceghostc2c: im not sure how I feel about that statement
<Spaceghostc2c> Me neither.
<profx_> im hoping you are not a trucker, 45, and living in your moms basement
<profx_> if you were, I may never return to this channel
<Spaceghostc2c> I wish things were going that well for me.
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<profx_> array.each do |index_array| ?
<Spaceghostc2c> profx_: What do you need exactly?
<profx_> that would give me each array within array in index_array, which I can then to index_array.each
<profx_> im doing the anaagrams question
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<profx_> i have two arrays, atm. one contains all the strings I am testing for anagrams in, the other is an array of indexes to that array, for all words that are anagrams
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<profx_> array = ['ab','bc','ba'] array2 = [ [0,2], [1] ]
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<profx_> i am trying to produce: array3 = [ ['ab','ba'], ['bc] ]
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<Mon_Ouie> Then you'd nest two calls to #map
<Hanmac1> profx_ didnt i allready anwer that to you jesterday?
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<profx_> Hanmac1: about 90% of it
<profx_> Hanmac:
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<Hanmac> i can make array3 out of array1 without using array2 ... (so you dont need array2)
<profx_> you did += [index]}.values
<profx_> and I tried array[index], but it fails
<profx_> yes, you can Hanmac :)
<profx_> but I , cannot :(
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<Mon_Ouie> The rule is simplyl that if the last character of an element is the first of the next one, they should be grouped?
<Hanmac> ['ab','bc','ba'].group_by{|s|s.chars.sort}.values
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<Mon_Ouie> Oh, never mind
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<profx_> s:command not found
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<profx_> i wasn't in irb :)
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<profx_> ha
<profx_> used each_char and it works
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<profx_> so can I ask
<profx_> what is in |s| ?
<profx_> each word in the array, I assume
<profx_> and s.each_char.sort will do a sort on each word in the array
<Hanmac> |s| is a block parameter ... like the i in an for loop
<nemesit|osx> hm how can i execute sudo commands with ruby?
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<profx_> block parameter as in a method parameter ?
<profx_> similar to in java ?
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<Mon_Ouie> Java has a (oh so verbose) syntax for defining anonynmous classes within methods. That's the closest thing they have to blocks (a.k.a closures).
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<Mon_Ouie> (if you want to compare it, I mean)
<profx_> but I use |variable| so I can sort each element in the array ?
<profx_> in this case, the variable is s
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<Hanmac> |v| is what the current iteration is stored ...
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<profx_> ok, so I really don't understand how the elements are each partitioned into individual arrays and they are also compared to each other ?
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<profx_> time for bed, nite
<profx_> thanks again Hanmac
<Hanmac> because String dont have sort anymore i need it to turn both "ab" and "ba" into an common object in this case ["a","b"]
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<Hanmac> i need an common object so group_by can work
<profx_> what is .values ?
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<Hanmac> it returns the values of an hash: {key1 => value1,key2 => value2}.values returns [value1,value2]
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<profx_> so you are taking an array, making a hash which then makes an array ?
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<Hanmac> yeah
<profx_> ok, what is the keys in this array ?
<profx_> since you are only getting the .values from it ?
<profx_> im assuming I would need to use .index ? (rather than .values)
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<Hanmac> ["ab", "cd", "ba"].group_by{|o| o.each_char.sort}.keys #=> [["a", "b"], ["c", "d"]]
<Hanmac> the keys are the splited and sorted chars
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<profx_> ugh, sorry, how do I produce that output ?
<profx_> i mean, if I did: string = ["ab", "cd", "ba"]
<profx_> then anagram = string.group_by...
<profx_> how can I output anagram so its an array of arrays ?
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<Hanmac> p anagram
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<profx_> ah
<profx_> p is not an alias for puts ?
<profx_> perhaps prints ?
<Mon_Ouie> No, p it uses #inspect instead of #to_s
<profx_> oh, they all have different results
<Mon_Ouie> And also puts has a special case for arrays, hence the difference in this case
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<Mon_Ouie> (puts [a, b] is the same as puts a; puts b)
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<Mon_Ouie> p object is puts object.inspect
<romankrv> Hello. my question is: How uninstall rubygem from system as system RubyGems packaging system? Thanks
<profx_> ok, now I am actually going to bed
<profx_> my forehead almost hit my keyboard
<profx_> no offense Mon_Ouie ;)
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<romankrv> again my question: Hello. my question is: How uninstall rubygem from system as system RubyGems packaging system? Thanks
<romankrv> romankrv @ 11:39
<Hanmac> romankrv why do you want uninstall rubygems?
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<romankrv> I want to remove gem system from system.
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<romankrv> or reinstall
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<Hanmac> "gem system" so you have an gem named "system" installed? oO
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<romankrv> no, i install http://rubyforge.org/frs/download.php/76073/rubygems-1.8.24.tgz but not i want to remove it from macosx? how it remove
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<romankrv> please help me about this question
<Hanmac> information: with newer ruby, rubygems is bounded with ruby, so it cant be removed without breaking ruby
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<shevy> hehe bounded
<shevy> why not bonded :D
<romankrv> that is; i must remove ruby that to remove gem?
<shevy> ruby bondage!
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<shevy> romankrv you could kill the gem file
<shevy> "find / -name gem"
<shevy> Hanmac whoa, removing rubygems would break ruby?
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<Hanmac> shevy he still dont answer me cleary why he wants to remove rubygems ... i think he does not understand what it is
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<romankrv> ok - thanks. I have one question yet: what is better use: RVM or rbenv? and what in more get resource (hdd, memory, cpu etc) ? and what more clearly to use?
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<shevy> romankrv I always compile and use ruby from source, so my answer is both RVM and rbenv is unnecessary
<shevy> rbenv is much smaller though so comparing the two is unfair
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<shevy> and if you are concerned about resources
<shevy> use C not Ruby :-)
<shevy> Hanmac, I decided that I need to master C
<shevy> there is just no way around it
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<Hanmac> shevy that sounds good, and if you master C, you can tame C++ too :P
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<shevy> nah
<shevy> C shall be enough
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<shevy> I won't like C anyway
<shevy> but learning C++ on top of that is just useless!
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<shevy> I'd like for C to add cout << "bla" though
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<shevy> and a _simple_ OOP model
<shevy> gtk C "OOP" stinks"
<shevy> vala stinks too
<shevy> there is too much stinkage in programming
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<kyletcarey> screen
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<negev> if you have the name of a class in a variable, say a = "MyClass" how can you use the variable to call a class method, eg MyClass.do_stuff ?
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<arturaz_> negev, if you use activesupport: a.constantize.do_stuff
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<arturaz_> if it
<arturaz_> if it's without :: -> Object.const_get(a).do_stuff
<negev> ah nice, thanks
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<Hanmac> negev it works as oneliner too: "ABC::XYZ".split("::").inject(Object,:const_get)
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<negev> hi, i've got a model object descended from a class called NSManagedObject. if i call obj.name from elsewhere in the code i can see the name, but inside the model class i can't do @name to get the name, how can i figure out how to access the properties? i've tried listing the instance variables but it seems there aren't any
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<Hanmac> negev it depends on the class, i dont know about NSManagedObject
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<Spooner> Hanmac : It is something in iOS/rubymotion so I'd guess the name will be external to Ruby, but negev decided that knowing wasn't that important ;)
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<elliot98> the net library works in 1.9.2 for ssl authentication, but getting an error with the same exact code on 1.9.3
<elliot98> what has changed?
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<shevy> we have File.extname
<shevy> what is the other way?
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<shevy> File.extname "abc.avi" # => ".avi"
<shevy> the one returning the "abc" part
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<Hanmac> shevy: File.basename "abc.avi", File.extname("abc.avi") #=> "abc"
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<shevy> ewwwwwwww :(
<shevy> that is one ugly thing haha ;)
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<Hanmac> hm yeah .basename is a bit shitty
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<nouh> sdf
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<sakh> if im inserting the following code into haml page
<sakh> check_box_tag "bla bla", :checked => true
<sakh> it does not seem to work?
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<sakh> checkbox stays unchecked, what am I doing wrong?
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<Spooner> sakh This is a rails question, but seems it doesnt' want a hash: http://apidock.com/rails/ActionView/Helpers/FormTagHelper/check_box_tag
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<Snader_LB> hi all
<Spooner> 'lo Snader_LB
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<matti> Spooner Spooner Spooner
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<Spooner> Hey matti! Got Fizzbuzz into the 2.0 stdlib yet?
<Snader_LB> if there's anyone with write access to the Web site <http://www.ruby-lang.org/>, or just a dev getting there, please PM me for a bit
<Snader_LB> there are some typos i'd like to report via this way
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<matti> Spooner: Not funny :<
<Spooner> Yeah, I already know they have a code-freeze on, before release.
<Spooner> :D
<matti> Spooner: Plus, the idea is to move most of stdlib to gems.
<matti> Spooner: Aside of that, nobody gives likes my FizzBuzz ;d
<Spooner> Oh yeah, that is true, but they will be gems distributed with Ruby, so effectively the same thing, only they can be updated.
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<Spooner> matti : I think it is a grand project.
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<matti> Spooner: Not funny, Mark II
<matti> ;d
<shevy> matti!
<shevy> let's marry
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<matti> Spooner: Stop mocking noobs ;p
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<shevy> stop nooking moobs!
<matti> shevy: Are you an cute asian girl?
<matti> s/an/a/
<matti> shevy: Preferably Japanese.
<shevy> no :(
<matti> Well then. I need to refuse.
<matti> But thanks for the offer.
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<matti> Very kind, indeed.
<matti> Provided that nobody would like to marry me ;d
<matti> [ ;p ]
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<sakh> ty Spooner, its confusing as I remember seeing this hash somewhere in docs
<Spooner> sakh : Yeah, it does take a hash, but not for that which is a regular arg.
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<Spooner> sakh Specific Rails questions are better in #rubyonrails though.
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<Spooner> sakh It is terrible API though, to have a default argument AND a hash. Bleh bleh bleh!
<sakh> oh ok thanks
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<matti> Spooner: Rails is like that ;d
<shevy> hehe
<shevy> I'd wish ruby projects would work
<shevy> can it be so hard to want a script that uploads a video to youtube
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<Spooner> shevy : I can guantee that all my gems don't work. At least I'm consistent.
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<shevy> lol
<shevy> this youtube-g gem does not work
<Spooner> If they do work, it is purely accidental.
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<waxjar> shevy, i was recently looking for youtube gems. youtube_it seems to be the best one
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<shevy> aha
<shevy> let's see, thanks
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<thejoecarroll> hi folks
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<matti> Ohai thejoecarroll
<thejoecarroll> hi matti
<thejoecarroll> you have a minute to help a n00b with some questions about instance variables, accessors and initialize
<thejoecarroll> ?
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<matti> thejoecarroll: Just ask :)
<thejoecarroll> cheers :-)
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<matti> Hey meskyanichi
<thejoecarroll> i'm working on an edx assignment. i don't want the solution, just to figure it out for myself. i have a couple of ideas, and i wanted to know where/whetehr i'm going wrong
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<Spooner> matti I'm waiting for someone to ask if they can ask if they can ask a question ;)
<matti> meskyanichi: I had no idea that you sit on IRC as well.
<meskyanichi> hello
<matti> Spooner: That does happen ;d
<meskyanichi> I'm on and off :)
<matti> meskyanichi: :)
<matti> thejoecarroll: You can show sample code.
<matti> thejoecarroll: Or explain the problem very well ;]
<thejoecarroll> here you go: http://pastie.org/5057396
<thejoecarroll> you won't get a better explanation from me :-)
<thejoecarroll> that's the full text of of the particular task
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<Spooner> thejoecarroll : You aren't the first person in the last 24 hours with this problem in #ruby ;)
<thejoecarroll> i'm sure :-D
<matti> Yeah.
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<matti> There will be 3 already.
<matti> Haha
<thejoecarroll> aw, thought there would have been more ;-)
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<thejoecarroll> some people have shamelessly put tasks up on stackexchange and asked for solutions
<Spooner> I can honestly say that it is a dreadful question and I can't see how you can do it with the given code (it isn't hard, but it is impossible if you absolutely use the code you are given).
<thejoecarroll> anyway, to be clear, i want to figure it out myself; i just need to get a few details straight
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<Spooner> Yeah, they will do. People are pretty stupid (because we want people to get good grades, not to learn anything).
<Spooner> But anyway, yes, I looked at this yesterday, out of interest. Ask away.
<matti> I'd do it differently.
<Spooner> matti would implement it as a C extension gem.
<thejoecarroll> well, i did think some of the instructions that are meant to help are a little confusing and complicate the matter
<matti> Spooner: Not funny, Mark III.
<matti> Spooner: I'd do it with method_missing
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<thejoecarroll> btw, i cleaned up that pastie (commented the instructive text so the ruby code is properly highlighted etc.)
<Spooner> Not a good way, matti, since you "use up" method_missing (Yes, you can method-chain it, but why bother if you can do it simply with dynamic code?).
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<matti> Spooner: For flexibility.
<Spooner> Why do you need it to be flexible? You know exactly what methods you need.
<Spooner> method_missing is better when you don't know what you need until run-time.
<matti> Indeed.
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<matti> What if I want to handle foo, bar, baz, quux, etc.
<matti> And have quux_history.
<Spooner> Sorry, by run-time I mean after object instantiation rather than during class definition.
<thejoecarroll> what i'm doing first is to create a Foo class that just does bar_history as asked. then i'll generalise that and add it to Class, defining #{attr_name}= etc. using class_eval as required
<matti> Spooner: Ah.
* matti is just a noob
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<thejoecarroll> but i'm embarrassed to say that getting the first of these steps isn't working the way i expected
<Spooner> So where are you falling over?
<shevy> the cliff
<thejoecarroll> my first question is to do with initialising variables
<thejoecarroll> (in fact, once i get that straight, i hope to manage the rest myself)
<shevy> I usually put the variables in a method called "reset"
<Hanmac> thejoecarroll:
<Hanmac> define_method("#{attr_name}=") {|val| (instance_variable_get("@#{attr_name}_history") || instance_variable_set("@#{attr_name}_history", [nil])) << val; instance_variable_set("@#{attr_name}",val)}
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<thejoecarroll> thanks, Hanmac , but i don't want a solution to the problem
<thejoecarroll> i provided the full problem for context
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<thejoecarroll> what i want to clarify is can you initialise an instance variable outside a class method definition?
<thejoecarroll> e.g. the following doesn't work:
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<Spooner> thejoecarroll Nope, you are creating an instance vairable on the class once, not on each instance.
<thejoecarroll> so it seems
<thejoecarroll> so my next thought was the standard constructor method, initialize
<Hanmac> (@bar_history ||=[nil]) << value
<Spooner> You need to use @bar_history ||= [nil] in the method, so that it sets it if it doesn't already exist.
<thejoecarroll> and what i wanted to check is that there's no way reopen the initialize method the way you can reopen classes etc?
<Spooner> You can't put it in initialize, since there is no guarantee that Foo class won't have an initialize and _not_ call "super".
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<thejoecarroll> i assume that if i were to write in an initialize for this instance variable, any class that uses the custom accessor and wants to define it's own initialize will break it, no?
<thejoecarroll> yeah, Spooner, that's what i was thinking
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<Spooner> Yes. You could use initialize here and it would work, but it would not likely work in the real world (and also you don't know which variables to create in initialize).
<thejoecarroll> so the only way to do it is a conditional assignment
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<thejoecarroll> great
<Spooner> Yeah, you need to create it when it is requested.
<thejoecarroll> that straightens things out for me
<thejoecarroll> i believe i can manage the rest
<thejoecarroll> thanks guys
<thejoecarroll> basically wanted to establish that there was nothing else special about initialize other than its name (which logically should be new, no?)
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<thejoecarroll> and that instance variables only work within method definitions
<Spooner> No, new is the class method. It creates an instance and calls initialize on it.
<thejoecarroll> ah
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<thejoecarroll> actually, that makes sense
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<thejoecarroll> i've been reading up on metaprogramming with this as starting point: http://ruby-metaprogramming.rubylearning.com/
<Spooner> But yes, there is nothing special about it other than that it always gets called from #new.
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<thejoecarroll> ok, that's clear
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<thejoecarroll> unfortunately some of the stuff i've read has muddied the waters as much as it has clarified other stuff. and some of it just needs to be read several times to sink in (and some experiments tried), e.g. Why?'s old metaid.rb article http://ruby-metaprogramming.rubylearning.com/html/seeingMetaclassesClearly.html
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<thejoecarroll> still getting my head around the some of the intricacies of the ruby object model
<thejoecarroll> love it though :-)
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<wwoodrum> hey guys
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<wwoodrum> im trying to write a scrit using the Fibonacci sequence
<wwoodrum> and I have most of the code written but I can't figure out how to start using a user defined value
<Spooner> Haven't had a Fibonacci for a week or two.
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<matti> Spooner: LOL
<wwoodrum> is what i have
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<wwoodrum> im getting 8,13,21,34
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<matti> Spooner: There seem to be something up on universities.
<matti> Spooner: FizzBuzz, Fibonacci, meta-programming.
<matti> ;]
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<Spooner> There does. I'm just happy to see they are teaching Ruby rather than Java (or Ada, which is what we got back in the day).
<thejoecarroll> btw, thanks Spooner & Hanmac for the reminding me of the ||= idiom for assignments. i'd forgotten all about that. concise and elegant
<rTypo> also probably Project Euler
<wwoodrum> so.. im assuming you guys already helped somone with fibonacci?
<Spooner> wwoodrum : Yeah, but not sure what your question is. Your code seems to work for me.
<wwoodrum> yeah it works, but I want to be able to input a value and start the sequence from that number
<matti> rTypo: Oh, yeah. Good point.
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<Spooner> wwoodrum : You can't.
<wwoodrum> =[
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<wwoodrum> -A method fibonacci(n) that calculates the nth user defined Fibonacci number.
<wwoodrum> -A method fibonacci(n) that calculates the nth user defined Fibonacci number.]=
<Spooner> However, if you want to improve it, don't generate the entire array. You only actually need to remember the last two values. You don't want a million element array.
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<wwoodrum> -Implements an option for the user to enter either integers (example above) or floats (decimals) before displaying the Fibonacci sequence.
<wwoodrum> oohh ok
<Spooner> Oh, I see, then you just need to do: puts fib(value)
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<wwoodrum> when i put fib(value) i get 8,8,8,8
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<wwoodrum> if i enter 6
<Spooner> Yeah, indexes start at 0 in Ruby. You probably want fib(value + 1) then
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<wwoodrum> kk
<Spooner> I mean: value -1
<Spooner> 10.times gives you 0 up to 9
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<Spooner> Or you might want to change the number in the method, so 1 is the first index. Depends what floats your boat ;)
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<thejoecarroll> Hanmac: going back to the solution you suggested earlier, what is the consensus on (ab)use of define_method, instance_variable_get, instance_variable_set etc.?
<thejoecarroll> (i finished the problem successfully some time ago with my own alternative, using class_eval, as instructed)
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<thejoecarroll> it seems to me that those methods, run counter to the general approach towards objects' instance variables
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<thejoecarroll> i discovered them and played around with them a bit yesterday, but figured that using them extensively is probably not good practice
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<thejoecarroll> i'm referring to your suggestion:
<thejoecarroll> define_method("#{attr_name}=") {|val| (instance_variable_get("@#{attr_name}_history") || instance_variable_set("@#{attr_name}_history", [nil])) << val; instance_variable_set("@#{attr_name}",val)}
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<Spooner> thejoecarroll : Using those methods is not any better or worse than using the class eval("bleh") route.
<thejoecarroll> fair enough
<thejoecarroll> i'd say eval has the potential to be more readable
<Spooner> The thing is that using them externally to the object, to bypass encapsulation, is bad, but the thing with Ruby is that you can always do something; it is just more convoluted to avoid the "protections" to try to encourage people not to do stupid stuff (or to make them doubly careful when they need to).
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<Spooner> thejoecarroll : eval is also faster at run-time, since you aren't manipulating strings and calling methods, but just directly accessing @frog_history
<Hanmac> i mosty try to awoid eval when possible
<Spooner> Yes, you should always use the least horrible method ;)
<thejoecarroll> that's a good detail to know, Spooner
<Spooner> thejoecarroll : But 99% of the time, that speed won't matter one jot (premature optimisation is a BIG mistake).
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<Spooner> thejoecarroll : Having read the specification, try removing lines 30&31 and see if you get the result it asks for.
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<thejoecarroll> well, it passed all the tests for the course's autograder: https://gist.github.com/3889067
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<thejoecarroll> but, i just tested it in irb, and i got nil, rather than [nil]...
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<shevy> wat
<shevy> [nil] is an array
<Spooner> Those tests aren't up to scratch then ;)
<Spooner> shevy No, it wants [nil], not nil.
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<thejoecarroll> i'd have to agree
<thejoecarroll> :-D
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<Spooner> thejoecarroll : You need to implement the history reader yourself is all. This is why I said that the given starting code _prevents_ you from actually completing the assignment.
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<thejoecarroll> well-spotted
<thejoecarroll> how long have you been coding ruby Spooner ?
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<thejoecarroll> you called that pretty quickly
<Spooner> Too long. As I said, though, I did this a couple of days ago.
<thejoecarroll> although, i guess you've already been bothered with this assignment earlier :-)
<thejoecarroll> yeah :-)
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<Spooner> If you get it working, I'll show you my version ;)
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<Spooner> Or you can have it now, allowing for the fact that you've technically finished your version.
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<thejoecarroll> i used to code as a hobby as a kid and for a while in my teens (basic, logo, pascal, c, c++, lisp) but lost interest at some point and only recently (i'm in my 30s now) got interested again, partly because i'm a sysadmin & it manager, and partly because ruby has inspired me. it's a really beautiful language, imho
<thejoecarroll> i'll fix mine first, then compare notes :-)
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<thejoecarroll> this is going on right now, pretty insane: http://www.redbullstratos.com/live/
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<Spooner> thejoecarroll : Yeah, I have been programming on and off since my teens, but very rarely professionally (40 now).
<peterhellberg> Just started playing around with perftools.rb, and I must say that I’m impressed :)
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<thejoecarroll> hmm
<Spooner> I agree.
<thejoecarroll> i thought this would work, but it doesn't (no errors, but nil is returned not inside an array):
<thejoecarroll> def #{attr_name}_history
<thejoecarroll> @#{attr_name}_history || [nil]
<thejoecarroll> end
<Spooner> ||=
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<thejoecarroll> ah
<thejoecarroll> oops :-)
<Spooner> Though you are right, that should still return [nil] (if you are using/testing it correctly).
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<thejoecarroll> that's what i thought
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<thejoecarroll> testing in irb || worked , i.e. nil || [nil] #=> [nil]
<thejoecarroll> since i don't actually want to do an assignment
<thejoecarroll> || should be more correct
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<thejoecarroll> actually, it was correct
<thejoecarroll> i just forgot to define the Foo class again before testing
<Spooner> Yeah, || does make more sense since you don't have to set it, depending on how you are doing the rest of it (I use ||=, but that is because of how I do other stuff ;P).
<thejoecarroll> i changed it back to || and can confirm that works. now let's see if i submit this more correct version, will the course's autograder still give me 100%. if now, i'll report an erratum
<thejoecarroll> s/now/not
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<Spooner> It presumably didn't check that part of the spec.
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<Spooner> thejoecarroll : My solution is https://gist.github.com/3889080 (though I'll admit the testing could be more thorough if I was being anal, it is quite enough for me :D). Going to be AFK a bit.
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<shevy> that's it
<shevy> I am gonna master vim and C AT THE SAME TIME
<shaman42> see you in 5 years then.
<shaman42> 2 months for c and rest for vim
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<peterhellberg> One could never dream of learning all of Vim… it just keeps on giving and giving, year after year ;)
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<thejoecarroll> is there a direct equivalent of PHP's array_intersect_key() in ruby?
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<yxhuvud> what does it do?
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<Spooner> thejoecarroll : "arr1 & arr2" will do an intersection.
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<Spooner> Oh, it doesn't mean arrays, it means hashes ;) Bloody PHP
<thejoecarroll> someone on another channel is saying it's not working exactly as he expected
<thejoecarroll> yep :-)
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<blazes816> new_hash = old_hash.keep_if{|k, v| other_hash.has_key? k}
<thejoecarroll> i'm surprised if ruby is missing a convenience php has. he's new to ruby too, so thought i'd check here if there's some awesome method we've overlooked. just found this article: http://rubysource.com/rails-mass-assignment-issue-a-php-perspective/
<blazes816> something like that if it does what I assume
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<Spooner> Yeah, that looks right, blazes816
<thejoecarroll> actually, that article doesn't address it
<thejoecarroll> array_intersect_key() computes the intersection of arrays using keys for comparison
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<Spooner> Yeah, blazes816 answer does exactly that. Thing is, I can't see a use-case for it, so hard to argue whether Ruby should have it (you can add special case stuff forever and ever).
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<bttf> i have ruby1.8 packages installed on a prod machine ... i have never compiled ruby from source before and was wondering, should i be able to compile the 1.9.3 packages and seamlessly upgrade my existing 1.8.7 installation ?
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<blazes816> new_hash = old_hash[other_hash.keys] would work if #[] took an array and returned a new hash from it
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<blazes816> well, I guess it wouldn't do the intersection
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<blazes816> that php/mass-assignment article is ridiculous. it has nothing to do with ruby, it has to do with AR, which many people know sucks
<blazes816> probably on par with the people who use PDO
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<Spooner> And anyone using unsafe input is a muppet and doesnt' have a lot to do with Rails or PHP either ;)
<pnbeast> bttf: FWIW, what I usually do is leave the distro's standard version alone, and compile my own, current version in another directory, then link it out of /usr/local/bin w/ a slightly different name. That is painful in some ways but convenient in others.
<workmad3> blazes816: on top of that, the whole thing about mass-assignment was a blown-up case of people overreacting to a mostly non-issue
<thejoecarroll> thanks blazes816 & Spooner
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<workmad3> blazes816: it blew up because of a case of github managing to miss a place they should have been whitelisting attribute assignment, and then everyone was like 'oh noes, mass assignment is a massive security hole, we must find ways to make sure this is never a problem'
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<blazes816> definitely agree. and it made them change to a totally different and unnecessary system
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<workmad3> blazes816: I quite like the new github system tbh
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<blazes816> oh, I mean rails
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<blazes816> not gh
<workmad3> blazes816: ah, you mean the whole strong-parameters thing?
<blazes816> gh's new stuff makes a lot of sense
<blazes816> yeah
<workmad3> blazes816: yeah, I'm not convinced by that approach tbh
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<blazes816> I mean, it's fine, but it could have been solved by have a default attr_accessible nil, or something
<workmad3> blazes816: and it breaks a lot of things... and IMO it moves the information to the wrong place
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<blazes816> workmad3: the info is my biggest complaint
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<workmad3> blazes816: I guess the thing there is that if you use non-AR models, strong-params still protects
<workmad3> blazes816: while the attr_accessible stuff is something that hasn't been pulled out into ActiveModel, afaik... but that indicates something
<workmad3> blazes816: active_attributes does try and do that, but I think AM should pull that side of things in personally :)
<blazes816> i didn't realize it wasn't in AM, but that sounds strange
<blazes816> yeah, for sure
<blazes816> everything that's non-persistence related
<blazes816> probably move that hyphen
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<workmad3> blazes816: thinking about it, I can actually think that the info is in the right place for strong-params
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<workmad3> blazes816: because it's frequently dependent on the controller you're in what attributes are allowed to be passed through... e.g. an admin controller allows more params to be assigned than a users controller
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<workmad3> blazes816: and that's a use-case that is annoying with attr_accessible mass-assignment :)
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<blazes816> that's definitely a good use-case
<workmad3> blazes816: a guy I work with also commented the other day that, to him (with a lot of java experience) it seemed odd to have authorization-style stuff in the domain model :)
<blazes816> i still think the model should be in-charge of what to allow, and provide alternative interfaces for doing such, but open to it
<blazes816> I'd setting for it being in an auth-related object if one exists
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<Hanmac> shevy: "an small step for a man, but an large fall for the mankind" :D
<blazes816> but they're not stock-rails so that'd be difficult
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<kendrick_> hi there, i'm trying to fix a bug in a coworker's bit of ruby. i don't actually know much in the way of ruby, but i'm confused by this
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<kendrick_> there's an object, xx, that when i look at xx.study it shows me "5::Fixnum"
<kendrick_> however, in a case xx when Fixnum ... else ... end block, it jumps to the else
<Mon_Ouie> Then, at the second point, xx is not a Fixnum
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<kendrick_> Mon_Ouie: well, xx doesn't get altered
<Mon_Ouie> Then it wasn't a Fixnum in the first place
<workmad3> kendrick_: xx isn't a Fixnum
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<kendrick_> so then why does xx.study show 5::Fixnum ?
<Mon_Ouie> You shouldn't rely on Fixnum either way: use when Integer then …
<kendrick_> again, i don't know ruby :)
<workmad3> kendrick_: the result of calling xx.study is a Fixnum
<kendrick_> Mon_Ouie: to be precisey, the case actually does when Fixnum, Integer ... else ... :)
<Mon_Ouie> That's redundant, any Fixnum is an Integer
<kendrick_> so would i want the 'case' to be on xx.study instead of xx?
<kendrick_> well, this isn't an integer, either, then :)
<kendrick_> code block is something like:
<Mon_Ouie> workmad3: What's that #study method anyway?
<kendrick_> [:foo, :bar, :baz].each do |x|
<workmad3> Mon_Ouie: I'm guessing it's a custom method on whatever object xx is
<kendrick_> xx = eval x.to_s
<kendrick_> .. then that case/when/else/end
<kendrick_> Mon_Ouie & workmad3 hah, aha, no wonder i couldn't find it via google
<kendrick_> shoot, brb. weekend = taking care of children while i try to do this fix :(
<Mon_Ouie> kendrick_: puts xx.class; p xx should tell you more
<Hanmac> kendrick_ in this case xx can be "absolutely" anything
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<workmad3> Hanmac: anything apart from a Fixnum anyway, thanks to a process of elimination ;)
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<kendrick_> class = String
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<kendrick_> which i guess does not surprise me, considering that x.to_s :)
<workmad3> kendrick_: so xx is a string
<kendrick_> i wonder what my coworker was thinking :)
<workmad3> kendrick_: which also seems to indicate that you've monkey-patched string at some point in your code-base ;)
<kendrick_> not it. :)
<kendrick_> otoh, his system is replacing an older one i wrote in PHP, so......
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<kendrick_> so i guess .study is something he wrote for logging/execption-raising purposes
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<workmad3> kendrick_: quite possibly... sounds a bit odd (especially as it sounds like what he really wanted/needed was just the .inspect method)
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<kendrick_> yeah i found the def for study. it crams .inspect and .class together, sometimes along with something length-related. again, this seems to be a helper function for debugging output purposes.
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<kendrick_> worst case scenario, since i know the cronjobs that invoke this script are sending it the right input, is to comment this block out and throw a FIXME comment in there
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<kendrick_> my coworker's under a bit of stress, and has been doing this himself, until we recently hired another engineer who's been helping him.
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<kendrick_> that said, it's annoying that he puts stuff that's obviously broken (cannot parse its own command-line args :) ) into production
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<peterhellberg> Released a new gem today, feels nice to have a productive weekend once in a while ;)
<peterhellberg> kendrick_: What about the test suite?
<kendrick_> heh, i _looked _at Tux Paint the other day. does that count as working on it?
<peterhellberg> kendrick_: Is it also broken?
<kendrick_> peterhellberg: no clue what kind of test stuff he has set up for this
<peterhellberg> kendrick_: Ah
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<peterhellberg> I’ve been having some issues with Travis CI today, it would be nice if there was some way to differentiate errors with launching the virtual machines and actual test run failures
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<kendrick_> sigh ok
<peterhellberg> Oh, and the little project I’ve been working on today just got linked from the main site: http://www.hashids.org/ruby/
<kendrick_> emailed my engineering team list :)
<kendrick_> thanks and cya folks! i'll probably pop in here now and then as i get more accustomed to this new codebase & ruby :)
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<kendrick_> *sigh* exception raised later in the script :D
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<peterhellberg> kendrick_: Ouch, I hope you figure it out :)
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<kendrick_> code out of sync
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<kendrick_> crap in production that's not in repository
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<workmad3> kendrick_: damn :( sounds like your team mate needs a bit of re-education in good developer practices, like making sure nothing gets to production that isn't in source control
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<workmad3> (hell, nothing gets to production without being tested too... preferably with both developer tests and business tests, and possibly some QA...)
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<hvq> hi, what does the hash :provides => :json do? If I want to look up functions like that, where can I see the references? Thanks
<hvq> get "/thing/?", :provides => :json do
<workmad3> hvq: so is this in the context of sinatra?
<Spooner> hvq It does nothing, but I am assuming you are talking about it in a very specific method call - in Rails, perhaps? Oh, Sinatra.
<kendrick_> workmad3: yeah. :( he's been under duress<sp?> lately. so getting a bit sloppy
<hvq> Spooner, workmad3: it's Sinatra
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<workmad3> hvq: maybe you should be reading sinatra documentation then :P
<kendrick_> sadly, that makes stuff break and everyone else's lives harder :) we have far too many fun projects to work on, instead of debugging
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<workmad3> kendrick_: unfortunately :( it's important to keep discipline even under duress, but it's also hard
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<Spooner> hvq : ":provides => :json configures the route to respond with an Content-Type: application/json" you know, Google responded to "sinatra provides json" perfectly well.
<workmad3> Spooner: yes, but now hvq has a new way to google - 'Spooner: what does X mean?' :P
<Spooner> I know. Grand, isn't it? Thus the sarcastic response.
<hvq> workmad3, Spooner: yeah, thanx! perhap I didnt include sinatra in the keywords, got no idea they are related :P
<workmad3> Spooner: I prefered my sarcastic 'rtfm' response ;)
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<Spooner> workmad3: And I haven't provided my invoice as a Google search consultant yet ;)
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<workmad3> Spooner: ooh, that's something to start doing :D
<workmad3> Spooner: what are your rates? £200 a search? :D
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<Spooner> workmad3: I dunno. I don't think the UK government could process the amount of tax I'd generate on that fee. It would wrap all the bank's clocks around to 0 again ;)
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<workmad3> Spooner: we could start a brand new industry
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<workmad3> Spooner: and at those rates, it would be worth trillions within a few days :D
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<Spooner> It already exists actually. There are SMS "ask any question" companies that are just googling for £5 or whatever.
<workmad3> Spooner: and besides... just funnel the profits through a shell account in jersey
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<Spooner> workmad3 : Think we've embarrassed poor hvq enough yet?
<workmad3> Spooner: I'm not sure... we could keep going for a bit longer :)
<hvq> workmad3, Spooner: :@)
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<profx_> anyone else working on their Berkley assignment ?
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<Spaceghostc2c> profx_: Berkeley doesn't tell me what to do!
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<Spaceghostc2c> Berkeley ain't my mom!
* profx_ sighs
<wwoodrum> word up ruby scripting homies
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<otters> scripting
<otters> hah
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<wwoodrum> if i convert an integer to float. will it automatically add .00 ?
<wwoodrum> or no...?
<Spooner> wwoodrum : It will truncate it, if that is what you mean.
<profx_> Spooner: the reverse wouold, you mean
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<profx_> float -> int would truncate
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<wwoodrum> well im back to the fibonacci number... is fibonacci possible with flaots or just integers?
<Spooner> profx_ : Yeah, brain not on ;)
<profx_> wwoodrum: just ints
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<wwoodrum> my professor wants: -Implements an option for the user to enter either integers (example above) or floats (decimals) before displaying the Fibonacci sequence.
<Spooner> wwoodrum : There is no sense in a fibonacci from an int. So you would be converting a float to an int if you are to accept floats.
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<Spooner> Oh jeez. No point from a float. I should give up today ;)
<wwoodrum> any idea what he wants?
<profx_> wwoodrum: make it multi-purpose, convert all floats to ints ?
<Spooner> Yeah, just run .to_i on the input.
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<Spooner> Though that makes no sense at all, since it is an integer, not a float. But that is professors for you - they are prepared to break all sense of logic in trying to fix a problem around their teaching goals ;)
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<wwoodrum> i think he wants the user to choose ints ( 0,0,1) or floats so it displays (0.00,0.00,1.00)
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<profx_> ah, so the result type is dependant upon the input type
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<Spooner> wwoodrum : The use of "then" is superfluous.
<profx_> in irb, can I reference the last command or the result returned from the last command ?
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<wwoodrum> what should i use instead of then?
<Spooner> Just don't use it.
<Spooner> Leave it out ;)
<wwoodrum> just use if else?
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<wwoodrum> kk
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<Spooner> The use of "then" is purely optional, so we don't use it. The only use that makes sense is in a one-liner "if x then 2 else 12 end" but you might as well use ?: in that case.
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<wwoodrum> gotcha, yeh took then out and still eveyrthing works fine..
<wwoodrum> jsut trying to figure out this float thing
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<Spooner> The requirement doesn't make sense to me, to tell the truth.
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<wwoodrum> yeah me either, I posted on the class discussion board. He is a pretty confusing professor last week required a lone_sum product, and so i used addition but then he pinged my grade 30 points because he wanted a lone_product and accused me of copying last semesters work when his instructions clearly stated lone_sum
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<Spooner> "If you can't do, then teach" (though not universally true, it is certainly common).
<wwoodrum> hah, well thanks again spooner! you're a great help
<Spooner> The thing is, for example, that "2.0".to_i == "2".to_i = 2, so you already _can_ enter floats or ints.
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<profx_> sorry, what is : ?
<Spooner> profx_ ?: you mean? It is the ternary operator and shorthand for if/else
<profx_> i mean, :
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<Spaceghostc2c> profx_: Depends on how you use it.
<profx_> books["Gravity's Rainbow" ] = :splendid
<Spaceghostc2c> It's called a colon.
<Spaceghostc2c> profx_: :splendid.class
<Spooner> Oooh, I thought you were referencing my message about using ?: earlier.
<boxy> Hey I'm using active record and need to pull all records with a certain movie 'rating' i've been previously using Movie.all but i'm having trouble finding documentation on how to do this?
<profx_> nope, I wasn't Spooner, sorry for the confusion
<Spooner> S'ok, profx_, I'll forgive you ;)
<profx_> ok, what is it, in that context ?
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<Spooner> As Spaceghostc2c said, just do :splendid.class to find out.
<profx_> would splendid do the same thing ? books["Gravity's Rainbow"] = splendid
<profx_> Spooner: that was not clear
<profx_> to try that command, I mean
<profx_> so its a symbol
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<Spooner> Although, in all fairness, Spaceghostc2c, there are plenty of cases where that wouldn't work to explain what something was (for example a method call, which would tell you what it returned, not that it was a method call).
<profx_> and splendid.class is an error
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<Spaceghostc2c> Spooner: Right, and I hope he knows what a method is at this point.
<Spaceghostc2c> profx_: because splended is a local variable that hasn't been assigned a value.
<profx_> ah, ok, so the symbol is needed (:)
<Spooner> splendid would be a local variable or a method call, so yeah, if there wasn't one it would be an error.
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<profx_> i thought it was a value, being assigned to a hash (key,value)
<profx_> but if it was, then it would be enclosed in ""
<Spooner> The : used as a prefix is a symbol, yes (though also as a postfix in certain circumstances, such as in a hash { frog: 12 } then the key, :frog, is a Symbol.
<Spaceghostc2c> profx_: "Waffle": "sauce"
<profx_> and the key (string) would point to the value (string)
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<profx_> you meant { :frog 12 } ?
<Spaceghostc2c> Nope.
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<Spaceghostc2c> frog: 12
<Spaceghostc2c> profx_: You should really get a book on this.
<Spooner> profx_: { frog: 12 } is shorthand for { :frog => 12 }
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<profx_> ah
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<profx_> so, what i said though is valid
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<Spaceghostc2c> Not quite.
<Spaceghostc2c> {:frog 12} wouldn't work
<profx_> ok, so what does a Symbol do ?
<profx_> it isn't a string
<Spaceghostc2c> profx_: Have you used any other programming languages?
<profx_> its not something that contains a value, like a variable
<Spaceghostc2c> Yes it is.
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<profx_> like a Java constant? (symbol)
<Spooner> Nope.
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<profx_> CONSTANT is immutable
<profx_> i guess thats were im thinking they are similar
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<Spooner> It is and it isn't. The value in CONSTANT can't be changed (though strictly, in Ruby, you can change it but you get a warning), but the object can be altered. That is: CONSTANT = "fish"; CONSTANT << " paste"; CONSTANT = 3 # The second statement is fine, the last isn't.
<Spooner> A symbol is a value, like a string or a number, not a type of variable.
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<profx_> oh
<profx_> ok
<Spooner> It just can't be changed. s = "fish"; s << "paste" is OK (makes s == "fishpaste", but :fish can't be appended to like that. As said, you probably want a tutorial not a lecture here :$
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<Spaceghostc2c> profx_: Mmm, no.
<Spaceghostc2c> symbols are mutable.
<Spaceghostc2c> Constants aren't.
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<Spooner> Spaceghostc2c: No, symbols are not mutable.
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<waxjar> I think of Symbols as immutable, singleton Strings
<Spaceghostc2c> Oh gotcha.
<Spooner> But there is a difference between a mutable variable and a mutable object.
<Spaceghostc2c> Yeah.
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<Spaceghostc2c> Spooner: thanks, almost imparted bad info.
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<Spooner> waxjar : Although a reasonable way to look at it, not sure that is useful to newbies ;)
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<waxjar> true, tho it might be useful for people that are familiar with other languagues
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<Spooner> Spaceghostc2c : Meh, imparting bad info is part and parcel of being in #ruby. I do it every day and did less than an hour ago.
<Spaceghostc2c> :D
<Spaceghostc2c> Spooner: <3
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<Synthead> in python, I can do something like print('You entered "%s".' % variable). Can I do something like this with ruby?
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<Synthead> and not just for printing strings, for strings in general
<workmad3> Synthead: yes
<Spooner> Just the same thing, yes, Synthead
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<workmad3> Synthead: p 'you entered "%s".' % "foo"
<Spooner> Synthead : In fact, that is legal Ruby as well ;)
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<workmad3> oh yeah, ruby has 'print' along with 'p' and 'puts' :)
<pnbeast> And a printf, too, no?
<Synthead> workmad3, Spooner: puts 'That is %s, thanks!' % 'great'
<workmad3> pnbeast: yeah, and an sprintf, iirc :)
<workmad3> there's lots of ways to print crap in ruby... hard to remember them all :P
<heftig> '%<b>02d %<a>02d' % {a:3, b:4}
<Spooner> Now we need to find out if % used like that is Python STEALING from Ruby or Ruby being inspired by Python (I shall boycott!)!
<yaymukund> class_eval v. define_method. Is there one that's generally preferred, or is this still a debatable/stylistic thing?
<Spaceghostc2c> Synthead: printf
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<Spaceghostc2c> It's there.
<heftig> yaymukund: you mean class_eval with def?
<Spooner> yaymukund : Use define_method if you can. Eval is to be avoided on pain of death.
<workmad3> Spooner: don't know
<yaymukund> heftig: yes, exactly
<Spaceghostc2c> yaymukund: One would prefer the lesser of two evals.
<heftig> Spooner: class_eval can also take a block
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<workmad3> Spooner: however, if ruby didn't have it, you could easily implement % formatting yourself in ruby :)
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<heftig> yaymukund: def isn't a closure, so it doesn't capture local variables
<heftig> yaymukund: saves on memory if you don't need them
<Spooner> heftig : True, but then you'd just be using define_method in it anyway.
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<heftig> Spooner: no, you can use def
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<Spooner> Oh right, sorry. See, bad advice again! My record is not tarnished!
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<yaymukund> hmm I'm gonna go with debatable :p I should read some more then.
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<Spooner> yaymukund : Probably doesn't make a huge difference then. I was only arguing against using text eval compared to non-dynamic code.
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<workmad3> yaymukund: they work slightly differently, basically
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<workmad3> yaymukund: and have different performance characteristics (like the closure/non-closure that heftig mentioned)
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<yaymukund> yup, I'm going metaprogramming for the first time so I probably want to know the subtleties and performance...what you said :p
<workmad3> yaymukund: you can also do 'def some_obj.some_method' to define a method on a specific object
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<yaymukund> workmad3: huh, never seen that one before.
<yaymukund> oh but it's on that specific instance
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<workmad3> yaymukund: yeah, it's a syntax for defining methods on the singleton class of an object
<Spooner> yaymukund : You probably have seen it: def self.frog (which adds the method on the class, which is self there).
<workmad3> yaymukund: and I bet you have seen it ^^
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<yaymukund> hah, nifty
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<yaymukund> is it like define_singleton_method in ruby 1.9?
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<workmad3> yaymukund: except that it doesn't create a closure
<yaymukund> oh gotcha
<yaymukund> def is to define_method as def self.method is to define_singleton_method
<yaymukund> roughly
<workmad3> yaymukund: roughly :)
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<bttf> so i installed rvm using sudo to do a system-wide installation of 1.9.3; i set it as the default ruby version ... now when i try to run my rails application on apache, i get errors from routines getting ran from my ruby1.8 installation, what gives?
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<pnbeast> bttf: Are you using a Linux distribution? Did you step outside the package management system of that distribution for your 1.9.3 install?
<bttf> yes im using debian squeeze and yes i did
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<bttf> i dl'ed rvm using curl
<bttf> debian squeeze repo
<bttf> repo's did not have ruby1.9.3 available ...
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<pnbeast> bttf: I don't have a good solution for you, but this is a large part of why package management systems exist. Maybe you can re-install the system version of Ruby to at least get that back - dunno.
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<bttf> pnbeast: ruby1.9.3 is required to use the latest rails
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<bttf> i guess you have a point though
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<bttf> i guess i will have to install an older version of redmine/ruby/rails that will be compatiable with this linux distro
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<Spooner> bttf : Well, you could still try installing in the home dir, not system, with RVM. Or use rbenv and rbenv_install.
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<rking> Hrm. Anyone know of an example gem that has a conditional dependency on another gem, depending on OS?
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<ryanf> you can release different gems tagged by os, right?
<ryanf> I mean, different copies of the same gem
<Spaceghostc2c> Yeah. Or you can release one gem with the ability to work on all platforms with different code.
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<ryanf> Spaceghostc2c: yeah, in this case I think the issue isn't with the gem's own code, but with needing to depend on different other gems depending on what platform you're on
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<ryanf> it seems like in practice people usually just make it an undeclared dependency
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<profx_> how can I do to: something.type and have hash returned ?
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<rking> ryanf: But if I do that, it won't pull it in for the non-stupid OSs, right?
<rking> (The non-declared dep)
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<ryanf> yeah, not saying it's a good solution :)
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<rking> Kk.
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<peterhellberg> There are some room for improvement when it comes to the .gemspec format
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<rking> peterhellberg: That just says "use Bundler", basically.
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<peterhellberg> Yeah, unfortunately
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<peterhellberg> net-ssh is having this issue (having a jRuby-specific dependency in the main .gemspec isn’t that great)
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<rking> Which, the thing about that is that it's not even right: when you use Bundler it'll calculate the Gemfile.lock from whatever machine runs it
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<peterhellberg> bson has a separate .java.gemspec for jRuby
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<rking> What I'm doing to solve that is make a bundler/ dir that ends up getting Gemfile.lock.osx and Gemfile.lock.lnx, then having the devs symlink to whichever one is appropriate, then just let the other OS people know if it's time to redo the "bundle update".
<rking> peterhellberg: Hrm, I'll look at that.
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<rking> Thank you
<peterhellberg> np
<rking> (The rubygems.org/gems/bson page doesn't actually have a link to its Github repo)
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<rking> peterhellberg: Yeah, that doesn't seem DRY or necessary.
<rking> Just put that code in a conditional, I'd say. Then you have one .gemspec
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<Spaceghostc2c> I agree having one gemspec is a better way, imo.
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<ryanf> wow, that's horrific
<ryanf> linked before reading
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<rking> ryanf: Actually, it's not that bad.
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<rking> I'd rather do that then push OS-specific gems.
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<rking> ryanf: Guard should do that for rb-inotify + rb-fsevent.
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<ryanf> I can't picture that working well with bundler at all
<rking> Bundler is its own problem.
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<ryanf> releasing a gem that doesn't work in a bundler context is kind of your problem
<ryanf> since almost everyone uses it
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<rking> (Specifically: It'd be nice to add platform-specific checks to Gemfile.lock, but the way it's implemented, bundler would blow up if you tried to extend new language onto the Gemfile.lock itself)
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<rking> Nono, it's not that it wouldn't work for Bundler.
<ryanf> it seems like it wouldn't. if you don't declare the dependency in-band, bundler won't let you load it, right?
<rking> It's just that you'd still have to solve the problem of platform-specific Gemfile.lock stuff, which I think the bundler/Gemfile.lock.{osx,lnx,win} solution is Ok ish.
<rking> Ahh crap you're right.
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<ryanf> doesn't rubygems have the concept of platform-specific gems though?
<rking> I think so
<ryanf> it definitely has something like that, but I can't find much evidence or information about it online
<peterhellberg> Yes, it is perfectly fine to release separate gems for separate platforms
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<Spaceghostc2c> Yeah, but you don't have to. :D
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<peterhellberg> It works just fine, and you get the correct version for your platform on "gem install"
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<rking> You just set the #platform = 'whatever' then it "gem build"s for that platform, then you can push that alongside your os-unspecific one?
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<peterhellberg> https://rubygems.org/gems/kinetosis <- One of my gems, that requires x86_64-darwin-10
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<ryanf> that sounds like the best approach, as long as it lets you have different deps for the different platforms
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<peterhellberg> Probably not a good example though, since Apple has stopped putting Sudden Motion Sensors in their laptops :)
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<rking> peterhellberg: So you're using Gem::Platform::CURRENT, meaning you manually gem build && push from each platform?
<rking> ryanf: Actually, yeah. There's no reason Guard can't do this.
<rking> ryanf: Though, wait
<rking> The thing with guard is that not everbody has libinotify/libfsevent or whatever as a dep.
<rking> OK, I gotit.
<peterhellberg> Kinetosis is a highly OSX specific gem, so that is why I was using Gem::Platform::CURRENT
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<rking> Make a 3rd gem, fsnotifyevent, that does the platform-specific uploads.
<rking> Then Guard could have guard-fsnotifyevent as its optional dep.
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<rking> peterhellberg: Right. But one could imagine a build process that looped through, setting that to something else, then pushing each of those .gem's, no?
<ryanf> yeah, that sounds reasonable. it could mess up people's Gemfile.locks, but that problem already exists with the current guard approach
<ryanf> basically this whole thing is a huge mess
<peterhellberg> rking: Sure thing
<peterhellberg> Well, time for bed now. Good luck :)
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<peterhellberg> I wrote my own wrapper for rb-fsevent recently, just to have _something_ that would work under Mountain Lion… kicker and guard was quite unstable for me, but that might have changed in the last couple of weeks
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<rking> ryanf: How would it mess up their Gemfile.lock's?
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<ryanf> if you have a project that multiple people are working on, and you're tracking your .lock, it will flip back and forth when people bundle install on different platforms, right?
<ryanf> but honestly I have no idea how to solve that problem with guard and the notify gems as it is
<tommylommykins> hmm
<tommylommykins> is there a shorthand for the block {|thing| thing}?
<ryanf> no
<tommylommykins> D:
<ryanf> {|o|o} :)
<rking> ryanf: But it won't.
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<tommylommykins> hmm
<tommylommykins> actually, maybe I could just remove the block and use the enumerator returned in this case \0/
<rking> ryanf: E.g. pry could stop doing the conditional gem 'rb-inotify' thing and just depend on 'rb-fseventinotify' only.
<ryanf> rking: why not? won't the bit where it says the dependencies of fsnotifyevent change?
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<ryanf> yeah, but the .lock includes versions of dependencies-of-dependencies too
<ryanf> it's fine for pry because we're a library and therefore don't track our .lock
<ryanf> but for applications it would still suck
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<peterhellberg> tommylommykins: It is unfortunate that anaphora isn’t natively supported in Ruby, but this discussion comes up once in a while :)
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<ryanf> but yes, i agree that would be a nice way to handle it in situations where you don't have to track the lock file
<rking> ryanf: Does the .lock include the platform name?
<ryanf> I don't know
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<ryanf> but even if it doesn't, the bit specifying the version of rb-inotify or whatever would still be changing
<rking> No
<rking> Pry wouldn't mention rb-inotify anywhere.
<ryanf> it doesn't matter if pry does. I'm talking about the Gemfile.lock of the end user
<rking> It wouldn't either.
<ryanf> even if the user doesn't explicitly type "rb-inotify" anywhere, the lock is a complete list of every single dependency, dependency-of-dependency, etc
<ryanf> which will necessarily include the platform-specific notification gem
<rking> I'm proposing a new, tiny gem that only does one thing: its gemspec is platform-specific to depend on rb-inotify or rb-fsevent
<ryanf> I understand that
<ryanf> but the lock will still specify the version of whatever gem that gem is depending on
<rking> Riiight.
<rking> Doggonnit.
<ryanf> it's basically not a solvable problem without having some more granular way of specifying which deps the lock file should care about
<ryanf> or not tracking the lock, but that would be really painful for other reasons
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<rking> OK, then this goes back to my original thought on this one.
<rking> Is that rb-fseventify should just compile different C stuff.
<ryanf> yeah, I just realized that while I was afk :)
<rking> In general I find it a bit annoying that there's not such a thing as POSIX+ that defines a common API to solve things like inotify vs. fsevent, but there's no reason we can't handle that at a different language level.
<ryanf> if you just vendor all three notification gems into one and conditionally compile/load the right one, you're good
<rking> I just didn't want to propose that because it would be my first extconf.rb if they say, "OK cool. Pull req it."
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<rking> All 3? 3rd == poll implementation?
<ryanf> oh, I thought there was one for windows too
<ryanf> all 2 then
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<rking> Maybe.
<ryanf> plus a no-op for systems that don't support inotify or fsevent
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<ryanf> and implementations that aren't compatible with those gems, etc
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<rking> I have to chug four energy drinks back-to-back to care what happens on Windows.
<rking> Yeah, the no-op being its existing polling stuff.
<ryanf> the polling implementation doesn't have to live in that gem, but you still need to make other systems not mind installing the useless gem for this to work properly
<ryanf> yeah
<ryanf> whatever
<ryanf> I guess for the gem to be useful outside guard, it might as well have the polling fallback built in
<rking> Right
<rking> I was thinking of putting the extconf in guard itself, but then it loses that "outside of guard" factor.
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<ryanf> yeah you probably don't want to bloat up the guard repo with two different platform-specific c extensions
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<rking> Hehe, the bloat aspect isn't even a concern for me.
<rking> You still have to download the code.
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<rking> And as epitron is quick to point out, breaking things into sub-gems, though appealing because of DRY and proper organization, ends up having a big performance hit due to rubygems stuffing $LOAD_PATH full.
<ryanf> yeah
<rking> ryanf: Thanks for talking this through. I was going to file a much dumber Guard issue.
<ryanf> no problem
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<ryanf> that jruby bug turned out not to be our fault btw
<ryanf> how are your 1.8 problems?
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<rking> Haven't looked yet.
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<rking> And the kids are back so my session is ending. ☺
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<Synthead> is there a way I can make dynamic URLs for doing GET requests?
<Synthead> without doing it by hand?
<Spaceghostc2c> 'dynamic urls'?
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<Synthead> Spaceghostc2c: yeah, for example, http://server?it&would&be=nice&to&make=this&from&a=hash
<Spaceghostc2c> You mean query params?
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<Synthead> Spaceghostc2c: sure
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<friskd> Hey all, i'm trying to use open-uri
<tommylommykins> hmm
<friskd> Ist that the only place to get docs?
<friskd> Its horribly incomplete.
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<tommylommykins> I'm trying take some Pathname objects and get some other pathnames which are the same but with different extensions