apeiros changed the topic of #ruby to: Ruby 2.0.0-p247: http://ruby-lang.org (Ruby 1.9.3-p448) || Paste >3 lines of text on http://gist.github.com
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<pipework> Packaging ruby isn't fun.
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<wald0> why by default when I use vim with ruby, there's a "#" char for the newlines ?
<sdegutis> what's the best way to hide internal data structures in a Ruby class created via C?
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<popl> wald0: there isn't
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<popl> wald0: try it after a line that doesn't begin with #
<popl> s/it/entering a new line/
<wald0> popl: i ask that because i have also see it in a ruby source code, so you mean that it doesn't has any purpose at all ?
<popl> wald0: I mean it's not doing what you think it does
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<popl> wald0: what do you mean you saw it in a ruby source code?
<wald0> popl: well, it looks an empty comment to me
<popl> wald0: have you tried doing what I suggested?
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<wald0> popl: yes, it worked, i was just curious about if this had any meaning
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<popl> wald0: just autocommenting with vim
<wald0> i see
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<popl> wald0: vim does this with commenting in most languages
<popl> wald0: ctrl-u to get rid of it
<blip99> hi all, when doing array concat i do A.concat(B) and the end result goes in A - but I want the result to go in B but in the same order of A_elements...B_elements
<blip99> should I just use + symbol and assign to B, instead of concat ?
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<seitensei> What is the best way to remove special characters within a string?
<seitensei> I'm currently using .scan().to_s, but that returns an array of strings
<Rylai> seitensei: "special characters"?
<Rylai> such as?
<seitensei> @#$%^&*アあ赤.!?...etc
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<seitensei> specifically, what I'm doing right now is .scan(/[a-zA-Z\s]/).to_s
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<Rylai> '
<Rylai> err.
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<itcharlie> seitensei: what you need to do is a string substitution.
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<itcharlie> look at gsub( )
<popl> >> a = (1..10).to_a; b = (11..20).to_a; a.reverse.each{|x| b.unshift(x)}; p b
<eval-in> popl => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] ... (https://eval.in/39421)
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<popl> heh, and he left
<popl> s/he/they/
<seitensei> gsub(), huh? Thanks.
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<itcharlie> yeah so example : string_variable.gsub(/\@/, '' ) # this would remove @ character from string variable. but if you want to change in place make sure you use gsub!
<itcharlie> seitensei: ^
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<seitensei> I see.
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<seitensei> I do see a problem with that, but it might because there's something I don't know
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<itcharlie> seitensei: whats the problem?
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<seitensei> I'm getting rid of everything that isn't latin character, save for spaces
<seitensei> Putting \W in there would do all that, but it would get spaces as well
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<itcharlie> I see
<itcharlie> and in the substitution you just want to delete the character and not replace it with space?
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<seitensei> Yep.
<seitensei> What I'm doing is converting strings into url-friendly forms without special non-latin characters
<seitensei> Spaces, I'm probably going to be substituting with hyphens
<itcharlie> seitensei: maybe try the URI::Escape gem?
<itcharlie> well that won't be removing the special characters but it would be escaping them making it url friendly
<seitensei> True, but it wouldn't exactly be human-friendly
<itcharlie> I see
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<seitensei> If I input a string like "Moby-Dick; or, The Whale", my goal is to get an output pf "Moby-Dick-or-The-Whale" out
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<itcharlie> ok so how about converting string to array of characters. iterating through each character and first checking whether that character is a space ( if so then skip to next character ) then checking if its a special character and if so then replace with "-".
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<popl> >> "Moby-Dick; or, The Whale".gsub(/\W+/, '-')
<eval-in> popl => "Moby-Dick-or-The-Whale" (https://eval.in/39422)
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<itcharlie> seitensei: then space can be replaced so you would be ok with using gsub . like popl example above
<popl> is there something like Perl strictures for ruby?
<Nilium> I can't tell if you actually mean strictures or typo'd structures
<popl> strictures
<Nilium> So, what would you do with them in Ruby?
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<popl> hm
<pontiki> popl: i don't know that ruby doesn't run all the time with the equivalent of strictures in perl
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<popl> ok
<popl> thanks a lot
<seitensei> popl: That works, but not when there's a non-word character in the middle of text or norma, punctuation
<popl> seitensei: You didn't provide any other examples
<seitensei> So something like "I am." would instead seem to feed "I-am-"
<seitensei> but it is certainly human readable
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<popl> so you want to leave full stops alone when they appear at the end of strings?
<popl> would you please take a few minutes and think about all your requirements, and *then* ask the channel?
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<seitensei> I think I was pretty clear on what I was going- stripping out all special characters, and replacing spaces with hyphens
<pontiki> >> "I am.".scan(/\w+/).join("-")
<eval-in> pontiki => "I-am" (https://eval.in/39426)
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<pontiki> "Moby-Dick; or, The Whale".scan(/\w+/).join("-")
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<pontiki> >> "Moby-Dick; or, The Whale".scan(/\w+/).join("-")
<eval-in> pontiki => "Moby-Dick-or-The-Whale" (https://eval.in/39427)
<pontiki> seitensei?
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<seitensei> \w
* seitensei headdesk.
<pontiki> i'm willing to bet there are still edge cases where that falls down
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<Nilium> It's probably not worth being concerned about, though.
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<pontiki> "".scan(/\w+/).join("-")
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<pontiki> >> "".scan(/\w+/).join("-")
<eval-in> pontiki => "" (https://eval.in/39428)
<pontiki> >> nil.scan(/\w+/).join("-")
<eval-in> pontiki => undefined method `scan' for nil:NilClass (NoMethodError) ... (https://eval.in/39429)
<pontiki> expected
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<Nilium> Why would you try to do that for nil? O_o
<pontiki> >> " ".scan(/\w+/).join("-")
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<eval-in> pontiki => "" (https://eval.in/39430)
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<pontiki> Nilium: i expected it to fail. if it didn't, something is wrong :)
<Nilium> I suppose you could make it not fail by implementing method_missing for NilClass.
<pontiki> i'm just trying edge cases
<Nilium> class NilClass ; def method_missing(*) ; nil ; end ; end ← Fun times for everyone.
<seitensei> I don't think any of those would be issues in normal use.
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<pontiki> >> "a".scan(/\w+/).join("-")
<eval-in> pontiki => "a" (https://eval.in/39431)
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<pontiki> seitensei: that's what we all say :)
<pontiki> right up until we get a whiny nil
<seitensei> That's what we all hope to be the case
<seitensei> Admittedly, the production environment is an odd odd place
<pontiki> the hope is to make the test environment the weirdest place the code will ever run
<Kelet> No, whenever I write a program and I have such cases I formally prove that it can never be nil unless cosmic radiation flips a bit, but that's why I have ECC RAM.
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* pontiki unleashes the butterfly swarm at kelet's code
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<sdegutis> if you were going to wrap a really simple ObjC class, without using RubyCocoa or MacRuby, but just the normal ruby.h stuff, would you use Data_Make_Struct ?
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<sdegutis> oh sorry wrong room probably
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<pontiki> might be
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<pontiki> i haven't a clue about using ObjC with ruby
<sdegutis> yeah that was a terribly stupid question
<sdegutis> heres a way better one
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<sdegutis> how can i attach a random C pointer to a Ruby object that i create in C, so that i can get this C pointer back out of it again later?
<sdegutis> should i just use rb_iv_get and rb_iv_set?
<sdegutis> those take a VALUE though, and i have a void*
<bnagy> sdegutis: people don't like it when you crosspost without at least saying you're doing it
<bnagy> fyi
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<sdegutis> bnagy: im trying to figure out which is the right room
<sdegutis> its a lot harder to ask metaquestions like that without just asking the question
<pontiki> this is true
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<bnagy> you could get an answer in either
<pontiki> but it is nice to say (crosspost from..)
<sdegutis> pontiki: ok, noted. thx
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<bnagy> but your odds are going to improve in about 3-4 hours
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<sdegutis> why?
<bnagy> europe wakes up
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<sdegutis> heh
<sdegutis> and i go to sleep :)
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<thecodethinker> is there any way for you to poll input in ruby?
<sdegutis> so i was looking for a way to wrap a void* in a VALUE, and it looked like Data_Make_Struct might be what i need
<sdegutis> but it seems like it does more than that, maybe too much. its hard to tell
<bnagy> thecodethinker: yes, but the actual answer depends on what you mean by 'poll input'
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<thecodethinker> bnagy: I am making a program that relies on user input. I am looking to make it NOT event driven.
<bnagy> there's a nice gem, think it's called highline
<pontiki> does highline do async?
<bnagy> yep, highline. Check it out.
<pontiki> did not know that :)
<thecodethinker> this one
<thecodethinker> ?
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<bnagy> otherwise IO.getc IO.readline etc, but it gets really ugly really fast
<pontiki> but those are all synchronous
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<bnagy> yeah I don't know offhand what you'd for for async
<bnagy> curses libs in ruby are apparently a pig to work with
<bnagy> guess you could just start rolling a big ol select loop, or see if EventMachine has a relevant extension
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<pontiki> thecodethinker: if i understand what you're after, you want nonblocking reads. read the IO man page to get some info on that.
<pontiki> i've not done it, so i'm not going to say how hard it is.
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<sdegutis> thanks guys
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<pontiki> so true, this: https://i.chzbgr.com/maxW500/7688881920/h81F5B33E/ -- i think someone's gonna have to change the beer song kata
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<thecodethinker> Is there a way to poll user input. I gave highline a try but it doesn't seem to constantly poll it. I need a way for the program to detect input w/o the user hitting enter. Can that happen?
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<pontiki> thecodethinker: i think that's why i pointed you at the non-blocking IO stuff...
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<bnagy> thecodethinker: getc will fire every time there's a keypress
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<bnagy> I think highline supports some of that stuff, but I could be mistaken
<pontiki> getc waits for a keypress
<pontiki> i suppose you could put that in a thread tho
<bnagy> yeah, that's how I'd do it
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<bnagy> have a Thread pouring keypresses into a Queue and then have something else doing whatever actions need to be done
<bnagy> cause you'd probably need some kind of toeknizer
<bnagy> but I say all this knowing 0 about the requirements
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<thecodethinker> I am following this tutorial and I'm having a bit of trouble with this line of code: $:.push File.expand_path('../lib', __FILE__)
<thecodethinker> Can someone decypher this for me?
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<pontiki> thecodethinker: it pushes the application root + lib directory onto the load path
<pontiki> more often see $:.unshift to put it in front
<thecodethinker> ah
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<thecodethinker> cool
<thecodethinker> thanks
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<hmsimha> so i'm trying to familiarize myself with a codebase that i've been working with
<hmsimha> This is a large project that has been created and maintained by one person, and I am the first new person to come on board
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<pontiki> is the other person still around?
<hmsimha> I'm wondering if it would be appropriate to push my possibly obvious comments to the repository
<hmsimha> yes he is
<hmsimha> for example: STRIP_FILTER = lambda{ |field| field.to_s.strip} #formats as string with leading and trailing whitespace removed
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<pontiki> oh, ah, yeah, those are actually pretty useless comments
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<pontiki> and they're the type that don't get maintained, usually
<hmsimha> ok. Thanks!
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<pontiki> those sorts of comments are okay when you're doing something to demonstrate something to a newbie to ruby
<pontiki> but not in working code, really
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<hmsimha> ok. I guess I am a newbie so they are helpful to me while trying to go through the code
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<pontiki> that's fair
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<pontiki> if you keep them as personal notes, not a problem
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<hmsimha> this entire file I am working with right now has no comments though
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<pontiki> are you new to ruby?
<hmsimha> it's hard to determine what kinds of comments, if any, would be appropriate to add
<pontiki> or just this project?
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<pontiki> well, ok, personal opinion here.
<hmsimha> I am definitely new to rails, I'm not experienced in ruby by any means either
<pontiki> much of ruby code i've seen has no comments
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<pontiki> but the lack of comments is really only disturbing to me when the previous coders made certain design or algorithmic choices that are not obvious
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<pontiki> and in cases in ruby where they've run amok with metaprogramming
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<hmsimha> ok thank you, that is helpful
<pontiki> the reasons why a certain implementation choice was made can save a future dev days of chasing down alternatives that might not exist, and that the previous devs have already eliminated
<pontiki> metaprogramming amok time is just wrong
<pontiki> otoh, i've littered a fair bit of code i've touched with bad doggerel, too, so...
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<pontiki> and even comments like "some right bastard mucked with this *again* and it broke the entire build" are quite useful to find
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<pontiki> to me, there are two kinds of useless comments
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<pontiki> one that simply says exactly what the code is doing
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<pontiki> the other is the boilerplate muck that some firm's coding standards dictate
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<pontiki> and that's enough from me
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<hmsimha> but aren't comments that say what the code is doing helpful, for example, for someone who wants to read descriptions of api methods without having to pore through the code?
<pontiki> not per line, heavens no
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<pontiki> because that's actually giving too much internal info
<pontiki> you document the contract for the API
<pontiki> not how it does it
<hmsimha> right.. but perhaps a comment describing a chunk of code and its utility, or an overall synopsis of the method itself?
<pontiki> if you look at ruby-doc, you see a much better way
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<pontiki> you see the methods described as *what* they do, and what the parameters are
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<pontiki> some examples are given to show how it's used
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<pontiki> then if you do want to see how it works, there's an expando link and voila
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<pontiki> but that level of commentary is for external user documentation
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<pontiki> in your STRIP_FILTER example above, if that is an exposed constant, i'd know exactly what it would be in most cases
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<pontiki> and the fact that it is a constant means i read it as a noun, as opposed to if it were snake_case, i'd think it was a method, therefore read it as a verb
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<pontiki> am i making sense, or am i just confusing things?
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<hmsimha> i think i am following, i'm just going over ruby-docs now too
<pontiki> if you hover over a method, you should see the background go pale yellow and a link appear in the upper right
<hmsimha> it's hard to determine what kinds of things may or may not be obvious to more experienced rubyists, but i guess i can assume that unless I have reason to believe otherwise, my comments won't be necessary
<hmsimha> there's a "click to toggle source code" button
<pontiki> yes, that's it
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* pontiki wishes someone else would say something about this...
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<narcan> anyone here use fnordmetric ?
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<warren> Hi, I'm having trouble with the scrypt rubygem. I am unable to reproduce a particular one-way hash from a similar C implementation of scrypt. It might be because I am using ruby incorrectly, or perhaps I am using the scrypt rubygem in an unexpected way that is unsupported.
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<warren> If you "gem install scrypt" and run that pasted ruby code, the last two lines of output do not match.
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<bnagy> just the standard scrypt gem?
<bnagy> ah crap I don't have any MRI, can't use C extensions
<bnagy> wait, yeah I still do
<bnagy> what's your sample input and output?
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<warren> bnagy: sample input and output are in that paste
<warren> bnagy: and yes, standard scrypt gem
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<warren> Here are 5 sample inputs and outputs for the scrypt C++ unit test.
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<bnagy> ok.. first issue is that I think 1024 is wrong
<warren> hmm
<bnagy> try 128 ( it's bytelength )
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<warren> oooh
<warren> oops
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<warren> bnagy: ooh, that made the output a familiar type of wrong
<warren> I saw this same wrong output while fixing the C++ unit test
<warren> hmm
<warren> test/scrypt_tests.cpp(20): error in "scrypt_hashtest": check HexStr(scrypthash).c_str() == expected[i] failed [065898d7ab2daa8235cdda9511d248f3010b5e11f682f80741ef2b0000000000 != 00000000002bef4107f882f6115e0b01f348d21195dacd3582aa2dabd7985806]
<warren> oh wait
<warren> no, it doesn't match
<warren> bnagy: thanks, I'm closer now ...
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<bnagy> warren: I also think they shifted the arg order
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<bnagy> if you look at the src it wants __sc_crypt(secret, salt, n, r, p, key_len)
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<warren> i'm calling it via def self.scrypt(secret, salt, *args)
<warren> which calls __sc_crypt(secret, salt, n, r, p, key_len)
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<bnagy> and what are n r and p supposed to be?
<warren> n=1024 r=1 p=1
<warren> by scrypt's specification
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<bnagy> oh ok, so 256 bit out
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<warren> 80 bytes input, 32 bytes output
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<bnagy> yep
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<warren> using __sc_crypt() directly has no difference in the output
<warren> this might be a byteorder issue in how I'm decoding it back to hex
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<bnagy> I think it's got to be a 0 salt
<bnagy> not blank
<bnagy> cause of all those leading 0
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<warren> ahhh
<warren> trying that
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<warren> bnagy: although that would require modifying the rubygem
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<warren> or maybe not ...
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<warren> I can run SCrypt::Ext.crypto_scrypt() directly?
<bnagy> can't see why you would have to?
<warren> salt = 0
<bnagy> can't you just pass a correct salt to the engine function?
<warren> has no length
<warren> hm
<warren> I want no salt at all.
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<ericboehs1> How can I have a thread die when its parent does?
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<ericboehs1> Thread.new { system ('sleep 10000') }
<warren> bnagy: attach_function :crypto_scrypt, [:pointer, :size_t, :pointer, :size_t, :uint64, :uint32, :uint32, :pointer, :size_t], :int, :blocking
<warren> bnagy: what is size_t?
<ericboehs1> I want sleep to die when the process that called Thread.new dies.
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<bnagy> it's a C type .. well, FFI type
<bnagy> ericboehs1: all threads will be killed when the main thread exits
<ericboehs1> bnagy: I guess it doesn't because it's a system call?
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<bnagy> really? :/
<ericboehs1> Yeah...
<bnagy> works fine for me
<bnagy> warren: so here's what's weird - those scrypt expected values all have a leading 00000
<ericboehs1> bnagy: Try it: ruby -e 'Thread.new { system "sleep 100" }'; ps auxww | grep "[s]leep"
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<warren> bnagy: yes, that's expected
<warren> bnagy: weird and expected
<warren> bnagy: rare hash outputs are how you create artificial scarcity in a bitcoin-like design
<bnagy> ericboehs1: huh, yeah you're right
<bnagy> warren: ah ok, all good then... apart from not working
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<ericboehs1> So does anyone know how to kill a threaded system call in ruby?
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<bnagy> it's not a system call, it's just the sleep command
<bnagy> you could look at fork() and see if you can get more control that way
<ericboehs1> The sleep command is an example.
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<bnagy> warren: it's weird. Are there either any other gems, or can you write against the same C lib it's wrapping?
<bnagy> like, in c
<ericboehs1> A long timeout will actually work in my use case.. I think I'll just do seomthing like: Thread.new { system "(sleep 100) & sleep 5 ; kill $!" }
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<ericboehs1> Solving ruby problems with bash :D
<apeiros> suicidal app
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<apeiros> def seppuku!; `kill -9 #{$$}`; end
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<warren> bnagy: I can easily just wrap the same C lib, but it won't be acceptable to upstream. they want either native ruby or an existing rubyge.
<bnagy> warren: yeah, just for debugging
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<[narcan]> anyone here used fnordmetric ?
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<warren> I'm rather new to ruby... I'll test it by making my own FFI rubygem.
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<bnagy> warren: hm.. wait is this written by hand?
<bnagy> usually these FFI gems would just wrap a well known external lib
<warren> bnagy: unclear
<bnagy> if you have a C lib you know, IMHO I would FFI that
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<bnagy> unless it's clear this guy hasn't just written his own version, in c
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<warren> i'm looking at the original author of scrypt's source now
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<warren> yeah, __sc_crypt makes no difference
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<bnagy> but I don't know where those test vectors are from
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<warren> bnagy: yeah, I noticed the empty salt test
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<warren> i'm looking into how ToString() decodes it
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<warren> Looks like uint256 is an array of int's
<bnagy> looks normal to me :/
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<warren> bnagy: I copied my own scrypt implementation into a FFI, the output is #<FFI::MemoryPointer address=0x00000002648850 size=32>
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<warren> bnagy: how would you recommend that I convert that pointer to 32 bytes into hex?
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<bnagy> warren: ptr.read_array_of_uint8(32) maybe?
<bnagy> then pack
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<warren> hmm, where is that in docs?
<warren> I should learn where to find this stuff.
<bnagy> FFI docs are a little sketchy, sorry
<bnagy> but you can use reflection via irb etc
<bnagy> some_ffi_ptr.methods etc
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<warren> ahh
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<warren> bnagy: you weren't kidding about FFI docs
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<bnagy> >> [0,0].map {|e| "%02x" % e}.join
<eval-in> bnagy => "0000" (https://eval.in/39454)
<bnagy> there's a wiki as well :/
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<warren> cool bot
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* Nilium looks up to see what it is someone is trying to do
<Nilium> Sounds easy to me, though not a clue how you'd do it via ruby-ffi.
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<warren> bnagy: wow. that resulted in exactly the same output as the rubygem wrapped scrypt FFI
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<bnagy> \o/
<warren> so ... it's something different about the decoding
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<bnagy> flawless victory :<
<warren> that's great actually
<warren> oh
<warren> either the input is encoded wrong, or i'm decoding it wrong
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<warren> scrypt rubygem itself is doing its job
<warren> empty salt is correct
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<bnagy> you could check ParseHex()?
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<warren> yeah, looking into that
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<warren> it's great to know that the rubygem itself is fine
<warren> It's ME that's wrong. =)
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<warren> 065898d7ab2daa8235cdda9511d248f3010b5e11f682f80741ef2b0000000000
<warren> 00000000002bef4107f882f6115e0b01f348d21195dacd3582aa2dabd7985806
<warren> bnagy: oh!
<warren> bnagy: it should have been obvious
<warren> see it? =)
<apeiros> interesting reordering
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<bnagy> I do, but mine didn't have 0000 at either end
<apeiros> bytes reversed?
<warren> hm
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<apeiros> >> ['065898d7ab2daa8235cdda9511d248f3010b5e11f682f80741ef2b0000000000'].pack("H*").reverse.unpack("H*").first
<eval-in> apeiros => "00000000002bef4107f882f6115e0b01f348d21195dacd3582aa2dabd7985806" (https://eval.in/39469)
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<warren> hmm
<warren> I was wrong
<apeiros> (note: I didn't read the backlog, so no idea what you're doing and what your actual problem is :D)
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<warren> bnagy: nevermind, the output wasn't the same with the FFI and our scrypt implementation
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<warren> what does .first do?
<apeiros> it gets the first element of the array
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<apeiros> unpack returns an Array
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<warren> ahh
<warren> that explains other problems I had =)
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<warren> well, at least I have a working scrypt implementation now... next I need to figure out why the scrypt rubygem isn't doing what I expect.
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<bnagy> so, what, your wrapper works?
<bnagy> just use that then ;)
<warren> bnagy: upstream won't accept it
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<warren> I either need to 1) figure out how I'm using scrypt rubygem incorrectly 2) write scrypt in native ruby, which I suspect will be way too slow since it's designed to be memory inefficient and slow 3) or fix the scrypt rubygem to do this thing it wasn't intended to do.
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<bnagy> ok then just fix the gem - if you've got working FFI code you should be able to see where it's different, no?
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<warren> our implementation of scrypt forked from the upstream scrypt a LONG time ago and we stripped out everything we don't need for performance
<xybre> Wait, you're trying to make scrypt *more* performant?
<xybre> Isn't that sort of exactly the opposite of the goal?
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<warren> hahahaha
<warren> yes
<warren> xybre: we're using scrypt in a weird way. It's a proof-of-work, the validator needs to be as fast as possible.
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<xybre> Making rainbow tables or something?
<xybre> scrypt won't be performant in Ruby, while Ruby can be optimized, bit shifting and all that is not fun stuff in Ruby, and it will be slower at runtime due to method resolution and object instantiation. For high performance applications a C extension is the only way to go.
<warren> xybre: bitcoin uses sha256d for proof-of-work, you need to find rare hash outputs with lots of leading zeroes to randomly solve a block solution. litecoin replaced the proof-of-work with scrypt + particular parameters.
<warren> xybre: I agree
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<xybre> That should be seriously flexing the security of SHA-2 and Scrypt algos.
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<jonahR> If anyone needs a simple RVM intro, I wrote a simple tip (article) about using RVM for projects at coderwall, https://coderwall.com/p/812law
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<xybre> jonahR: going to spam every channel with that?
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<jonahR> only pasted into two channels. Sorry
<gnufied> xybre: thats uncalled for. it is not spam.
<jonahR> only trying to help out new ruby devs
<Xeago> better keep it on you clipboard when somebody mentions it
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<gnufied> I am amazed what people will call spam these days.
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<bnagy> linkbaiting is spam imho
<gnufied> bnagy: do we call spam when you post your github project etc?
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<gnufied> spam is inherently, something which is not revelant to the group/community
<bnagy> if I ever did it when it wasn't actually directly related to the discussion, yeah, you could
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<xybre> When I see someone copy paste the same blurb with a link between multiple channels it is a yellow flag.
<jonahR> gnufied: thanks for staying true to MINSWAN
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<xybre> At least you're not a bot, had that happen last week.
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<warren> bnagy: working but "wrong"
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<warren> bnagy: although i'm being told by the litecoin devs who forked scrypt long ago that our scrypt is optimized and a lot faster than the original
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<bnagy> nice
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<bnagy> what's 'wrong'?
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<warren> bnagy: I can imagine the scrypt rubygem maintainer won't like the idea of including yet another implementation
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<bnagy> I'm confused though - does your c code pass their tests?
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<warren> bnagy: "their" being who?
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<bnagy> the ruby scrypt
<warren> no
<warren> our C code is hard-coded to litecoin's scrypt parameters.
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<bnagy> hrm
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<bnagy> can't you just publish your own gem, then use that?
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<warren> The upstream owner of bitcoin-ruby is resistant to relying on FFI at all. He isn't convinced that the speed of the hash matters. I don't think he realizes how horrible scrypt would be in native ruby.
<warren> but he begrudgingly will accept an existing, widely used library
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<bnagy> it would probably be vaguely ok in jruby :P
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<bnagy> but I guess that's going to fly even less
<warren> He said no to relying on java, even though most people run this in jruby.
<bnagy> sounds like a bit of work to write it in ruby though
<bnagy> I'd love to see the benchmarks though :)
<warren> I thought this would be a quick port when I saw the scrypt rubygem ... supposed to be working on my thesis now. =)
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<puppeh> can I do '$addToSet' in mongo for a nested field?
<warren> bnagy: one of my team thinks he fixed it to use tarsnap's scrypt: http://paste.mhanne.net/raw/422952187de7d308b31f5bff9ca400c3d14f6ec3
<warren> testing now
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<warren> bnagy: curious, 1024 was actually correct
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<bnagy> yeah I took that back when I realised the arg order was reversed
<bnagy> it's using the orig as the salt that's the change
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<bnagy> wt..f
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<bnagy> yeah works via the normal scrypt method too
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<bnagy> well that's freaky. I don't think I would ever have thought of trying that
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<warren> bnagy: at least with the parallel code it will be easy to benchmark the two
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<bnagy> scrypt_1024_1_1_256 I guess I never read the source for that
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<bnagy> trippy :)
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<Judge> moin moin :)
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<warren> bnagy: thanks for all the help, this new language is strange to me
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<matti> ]
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<Xeago> mind if I ask an AR related quesiton here? #rubyonrails is slow and seems to ignore me, as it has done so in the past
<Xeago> how would I make model A always load its associations?
<Xeago> such that a query like "select a.*, b.* from a, b where a.b_id = b.id" is generated
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<troessner> ?
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<Jad`> hey all,
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<jlebrech> where do you put options for dropdowns if a model has a lot of options, i don't feel there warrant being in the db.
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<TIJ> i am trying to install gli version 1.6.0 but it automatically install the latest version 2.7.0 what should i do?
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<Kelet> TIJ, Download the specific version you need and install it presumably
<Kelet> TIJ, Why do you want 1.6.0?
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<Kelet> TIJ, Anyway, all you need to do is download https://github.com/davetron5000/gli/archive/v1.6.0.zip, unzip it, cd to the directory, and type gem build gli.gemspec
<Kelet> and then gem install gli-1.6.0.gem
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<Kelet> Or preferably just change your code to use the new version presumably, but you probably just want to get shit done, so go for it.
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<_br_> Btw. have you guys seen this? Fun! :) https://www.bloc.io/ruby-warrior/#/
<reactormonk> length is 58, but puts is only run once. No stderr. http://sprunge.us/hEaR
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<xeqtr> Need some help with sort
<xeqtr> I have a bunch of files in a certain dir. They are all called rc_1.rb, rc_2.rb, etc
<xeqtr> I need to get the file with the highest number in it
<xeqtr> I did Dir.glob("*").sort and then took the last one and removed rc_ and .rb
<xeqtr> this worked for the first 9 files
<xeqtr> but when 10 comes along that wont end up at the end of the array. it'll end up after 1 so it all stops working here
<xeqtr> Any suggestions on how to solve this please?
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<migimunz> do you need the file with the highest number or the number itself?
<xeqtr> mostly the number it self. if i need the file i can fetch it later when i have the number
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<_br_> xeqtr: Since you have a fixed naming scheme, maybe this is what you want ? ( Dir.glob("*.rb").collect! { |f| f.tr( "^0-9", "" ).to_i } ).max
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<xeqtr> _br_ nice, i just got it working by using these two functions https://gist.github.com/jackganzha/886382
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<xeqtr> thank you both for the help
<_br_> np
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<_br_> xeqtr: maybe this is better. Dir.glob( "*.rb" ).sort_by { |item| item.tr( "^0-9", "" ).to_i }.pop
<_br_> a bit more maintainable.
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<xeqtr> _br_ does that return the highest number?
<_br_> no it returns the filename with the highest number
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<xeqtr> aah
<_br_> xeqtr: Find all *.rb, sort them by the int and give me the last value of the array (largest)
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<xeqtr> _br_ it would be nicer to use. i just need to rewrite some lines first cause now i'm using the same function to return all files, some files, and then just picking the highest from that result
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<_br_> uh, I see.
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<_br_> well, need my caffene fix. bbl
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<zai> if I install a gem with rdoc documentation: where do I find the rdoc documentation? (ubuntu)
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<zai> found it. it's $(gem env gemdir)/doc
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<_br_> zai: gem gem help contents
<_br_> zai: gem contents <gemname> | egrep -i doc
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<perlsyntax> Does RubyGems come with ruby 1.9.3?
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<perlsyntax> nevemind i found it:)
<perlsyntax> forgot it was gem silly me.
<zai> thx _br_
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<perlsyntax> hi zai
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<lord4163> Hello
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<lord4163> I wanted to know if it's really hard to make a GUI application which can read/write xml, send web requests, download files and play them? :)
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<lord4163> Has to be crossplatform, and what do you guys use to create GUI's in Ruby?
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<nikeita> lord4163, you can give Shoes a try…here u can find an article on my blog http://pragtob.wordpress.com/2013/07/17/shoes-4-a-progress-report/
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<nikeita> sorry last one
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<lord4163> nikeita: Cool thanks, that one is cross platform?
<nikeita> yes, but check the docs
<mwmnj> Any Heroku users around?
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<lord4163> nikeita: I'll take a look at your blog, but do you think I can do what I just said?
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<nikeita> yes
<nikeita> of course depend on the gui you want to design
<nikeita> do not expect full fledged UI components
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<lord4163> nikeita: basically I want a login screen and when logged in it continues to the videoplayer
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<nikeita> ok, then th UI is nto the problem…u should read the docs to video support
<nikeita> to/for
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<nikeita> other option is JRuby
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<lord4163> nikeita: Okay :)
<nikeita> with that you have all Java UI components and cross platform
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<lord4163> nikeita: you think Java is better for this project? :)
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<lord4163> nikeita: ain't I develish then? :D
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<lord4163> nikeita: One of the apparent questions is: “Can I use shoes4 right now?” The answer is: “Not yet.”
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<Xeago> does the error message in here mean an internal pry error? http://hastebin.com/corewaniqo
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<Kelet> lord4163, I've had good luck with JRuby + Swing, but it's pretty "heavy" in terms of, like Java, it sucks up the memory and such.
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<lord4163> Kelet: What about Qt?
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<lupine> qt-ruby is a bit special at times and places
<Kelet> I feel like one of Ruby's downfalls is that nearly all ui bindings are outdated or just ugly
<lupine> I honestly can't recommend it
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<Kelet> and by ugly I mean they are fairly straight bindings and not very idiomatic ruby
<wuest> Kelet: I agree. I'd love for shoes to not be broken from a packaging standpoint, since it is pretty darn good otherwise.
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<Kelet> Yeah, I used shoes some years ago, it seems like it is what ruby needs :)
<Kelet> hopefully the new developers can eventually deliver something good
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<Kelet> but when I used it, it essentially came with a separate distribution of Ruby which is ick
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<nikeita> lord4163, for this kind o prj i think jruby is the way to go, imho
<nikeita> if u want ruby.
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<shevy> Kelet I think the new maintainers failed to deliver with shoes
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<Kelet> shevy, Yeah, which is super unfortunate because I think not having things like Shoes keeps Ruby from evolving in other directions, but since I'm not contributing to the area I won't complain too much :)
<shevy> yep
<shevy> the evolution of the WWW also made development for bindings in ruby for GUIs harder
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<shevy> like when everyone is using rails, they see little need in using ruby-qt or ruby-gnome. or shoes
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<wuest> Yeah. Clearly applications should just be packaged up with Webrick and distributed as portable web apps :p
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<kreantos> hello, when i start my sinatra application it tells me "https.rb:22:in `require': cannot load such file -- openssl (LoadError)" i installed then openssl via rvm but then it says "/net/http.rb:678: [BUG] Segmentation fault (core dumped)"
<ericwood> kreantos: do you have openssl installed on the computer (not talking about the gem, but the actual libraries)
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<kreantos> yes
<ericwood> kreantos: what platform are you using?
<ericwood> OS X?
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<kreantos> ubuntu 13.04
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<ericwood> weird.
<ericwood> you may want to try #sinatra
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<ericwood> this channel is more devoted to just plain 'ol ruby; the sinatra channel will probably be more helpful
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<kreantos> i have installed libssl-dev and openssl on ubuntu
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<kreantos> ok, thanks ericwood
<ericwood> I think those are the right packages, but it's been a while since I've used aptitude
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<ericwood> my best guess is that there's some stuff that's dynamically linked and the headers are missing
<ericwood> but you'd probably see that when installing the openssl gem...
<ericwood> hhhmmmmm
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* ericwood is of no use at this point
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<Xeago> i could also be incompatible versions
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<_br_> I generated dynamically a class object. I'd like to "require" it into objectspace. What is the best way to approach this ? ObjectSpace.class_eval ?
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<sdegutis> Is there a less convoluted way to get a C-str from a Symbol than rb_id2name(SYM2ID(obj)) ?
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<Xeago> sdegutis: you may also try #ruby-lang
<sdegutis> thanks
<Xeago> more core-developers are in there
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<cr3> how can I filter a function that yields a bunch of values?
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<elepedus> Hi all
<elepedus> I've got a problem with a web scraper I wrote
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<elepedus> It ran fine for about half an hour and then i got this error https://gist.github.com/elepedus/6105098
<elepedus> and I have not idea how to fix it :(
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<andrewcarter> hey guys- we're looking into using rake tasks to replace maven on our build server
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<andrewcarter> one nice thing maven does is let you "inherit" build tasks
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<andrewcarter> is there a way to use a remote "sub rake"?
<_br_> elepedus: Maybe it fills up your memory, did you log exactly what was going on? e.g. what page was being scraped etc. ?
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<_br_> elepedus: Since its a long-running process you might have a memory leak issue, not sure.
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<elepedus> _br_: I didn't log anything, unfortunately
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<elepedus> but, i think it was about 1200 pages through (out of 2800)
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<_br_> andrewcarter: "sub rake" ? What does that mean? Is that a inherited build task or something ?
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<_br_> elepedus: Well, then its absolutely impossible to help you, because we can't rule out anything.
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<HAPPYFUNBRO> hey. this command should store the output of the command in the variable, right? db2_config_check = `su - "someuser" --session-command "db2set -all DB2COMM"`
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<_br_> HAPPYFUNBRO: Well, no, su forks another process
<Xeago> AARGH, recruitment hell
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<HAPPYFUNBRO> _br_ so how would I store the output of that command./
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<elepedus> _br_: I'm thinking of trying to split the array I'm using into a few pieces using values_at and trying again. Do you think that might help? What changes can I make to make it easier to debug?
<sanav> i'm a newbie .I face a problem while learning mixin .Please check this : http://pastebin.com/kwyks2qg/
<_br_> HAPPYFUNBRO: Since you are doing shell hackery I would suggest a simple plain log file on /tmp or so.
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<_br_> elepedus: You need to integrate a sane and proper log file system and output what is going on at the moment .. secondly for long running ruby processes you need to monitor whats going on e.g. memory consumption etc.
<andrewcarter> _br_: yea
<_br_> elepedus: Like I wrote, without more information, tracking down the issue is difficult.
<andrewcarter> _br_: I coudn't find that documented but I saw some people using it
<andrewcarter> looks like it works but
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<HAPPYFUNBRO> _br_ there must be a way to do this
<elepedus> _br_: thanks for trying :) I'll look into implementing logging
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<_br_> elepedus: np
<HAPPYFUNBRO> *without creating a log
<_br_> HAPPYFUNBRO: Sure there is but it will be unmaintainable imo
<lectrick> What's the best (fastest, least resource-intensive) way to approximate PI in Ruby?
<HAPPYFUNBRO> _br_ why?
<_br_> lectrick: Math::PI ?
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<HAPPYFUNBRO> I mean, I have a script that appears to shiw it working
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<_br_> andrewcarter: No clue, what you are talking about. Still no idea if you mean inheritance with "sub rake"
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<andrewcarter> _br_: it seems to basically import the methods from another rake task
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<_br_> sanav: Seems like rather you have a SYNTAX error. Try running ruby -c on your file to see if its ok.
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<_br_> andrewcarter: Ah, ok now it makes more sense.
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<andrewcarter> _br_: yea so I'd like to be able to do that from a remote file but
<andrewcarter> might be to many layers of voodoo magic to make that happen
<andrewcarter> I need to rethink what I'm trying to do :p
<andrewcarter> I think I'll just make a build server step that gets the latest Rakefile
<sanav> _br_: unexpected in '\n' in R.rb
<andrewcarter> and make a config it can reference
<sanav> _br_: unexpected '\n' in R.rb
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<aedorn> HAPPYFUNBRO: Your original command will capture output, as long as your implementation of 'su' doesn't send stdout to someplace else.
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<HAPPYFUNBRO> aedorn yes, it should work
<HAPPYFUNBRO> shouldn't this work then not_if { db2_config_check.match(/TCPIP/) }
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<HAPPYFUNBRO> (TCPIP is in the oputput string)
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<lectrick> _br_: If I want a value of arbitrary precision :)
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<_br_> andrewcarter: Possibly, rake has still many holes.
<_br_> lectrick: how many digits ?
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<aedorn> HAPPYFUNBRO: Yes, it should as long as db2_config_check came back as a string. You might want to double check your output by adding "p db2_config_check" to make sure you're storing what you think you're storing when this is running.
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<lectrick> _br_: However many I want? I was more interested in the best solutions available to that problem (if possible, in ruby) than in the actual value itself.
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<HAPPYFUNBRO> what the hell is going on here:
<HAPPYFUNBRO> db2_config_check = 'word'
<HAPPYFUNBRO> not_if { db2_config_check.match(/word/) }
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<HAPPYFUNBRO> but the code block in question still runs
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<_br_> lectrick: Hm, "however many i want" is tricky. I think the digits in ::PI are rather limited. If you want arbitrary precision you either need something that calculates arbitrary precision e.g. mersienne prime implementation or a really long contant what satisfies your entropy.
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<cr3> how can I use methods like each, filter, etc. on a function that yields values?
<_br_> HAPPYFUNBRO: If you do this kind of stuff you might want to look into "named pipes"
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<HAPPYFUNBRO> _br_ this should work though
<HAPPYFUNBRO> no?
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<_br_> HAPPYFUNBRO: No, su spawns an entire new Process.
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<HAPPYFUNBRO> _br_ look again:
<HAPPYFUNBRO> db2_config_check = 'word'[11:44] <HAPPYFUNBRO> not_if { db2_config_check.match(/word/) }
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<HAPPYFUNBRO> no su there
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<_br_> what is "not_if" ?
<aedorn> chef thing
<_br_> unless?
<HAPPYFUNBRO> it's a chef construct
<_br_> ah
<_JamieD_> how do I convert a float into the next integer up? e.g. 2.1 > 3 or 5.8 > 6
<HAPPYFUNBRO> oh shit
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<aedorn> HAPPYFUNBRO: try using !!db2_config_check.match(/word/)
<HAPPYFUNBRO> yeah, do not run if this is true
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<_br_> Facinating. Why did the chef people define a new operator "not_if" ? What was wrong with "unless" ?
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<lectrick> _br_: Because they could, probably lol
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<aedorn> _br_: It's a condition modifier for tasks. So you build your task up and at the end you can add that in without having to add an unless modifier at the end of the task description.
<_br_> _JamieD_: Well there is #round but it works on the normal math of everything above >.5 is round up aso.
<_br_> aedorn: ah interesting, thanks
<aedorn> _JamieD_: use #ceil to round up
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<_JamieD_> aedorn: thanks
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<michael_mbp> hello
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<aedorn> why must laptop vendors put pozidriv screws in
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<_br_> aedorn: Well, some vendors even invent special screws (hint: apple) so I wouldn't complain too much about pozidriver screws.
<michael_mbp> true
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<michael_mbp> btw any ideas on handling currency input in EUR format?
<_br_> michael_mbp: Hm, "money" gem ?
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<michael_mbp> i.e. 2.340,20 is 2340.20
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<michael_mbp> _br_: without the money gem, I don't think that'll help with this
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<michael_mbp> the way I see is a gsub strategy
<_br_> michael_mbp: oh, I see your problem now. No, thats a country specific formatting of currency. Haven't seen a "out of the box" solution for that.
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<aedorn> oh my mistake, it's a quadrex screw...
<aedorn> that makes it so much better... /sarcasm
<michael_mbp> _br_: yeah
<_br_> aedorn: hehe
<michael_mbp> lol aedorn
<michael_mbp> _br_: I'll spec this tdd... only sensible way :)
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<michael_mbp> thanks
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<michael_mbp> _br_: what's the term for this kind of input?
<michael_mbp> 'country specific formatting of currency' is a bit long :)
<_br_> michael_mbp: I still think using e.g. the money gem as a basis makes sense. There is alot of goodness in there which helps you with other tasks. Formatting the output shouldn't be to difficult with all the helper functions in there.
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<michael_mbp> yeah I saw that one...
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<_br_> Anyone have an idea if its possible with RMagick to use an image and a mask and produce a alpha channel png ?
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<aedorn> michael_mbp: Try RubyMoney, it has a formatter in it for different currencies. Not sure if it's what you want, though: https://github.com/RubyMoney/money
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<aedorn> oh
<aedorn> I just read up
<michael_mbp> :)
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<_br_> Never mind the imagemagick one, found it,.
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<aedorn> actually does look like the money gem will parse strings out too
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<adimania> Hi, can unicorn handle https traffic directly without nginx/apache/any other server?
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<aedorn> Money.parse("2.345,12", "EUR").to_f #=> 2345.12
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<atmosx> adimania: sure why not
<atmosx> adimania: all rack-server can
<atmosx> unicorn is pretty secure also, there lots of people running it without using nginx as proyx
<adimania> any docs or config example which you can share?
<atmosx> I can give you mine
<atmosx> wait
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<HAPPYFUNBRO> could someone explain why this code is broken? http://pastebin.com/7ytzuuDq
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<adimania> atmosx, there is no ssl specific config.
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<adimania> this can serve http traffic well but if I try https I get "Error 107 (net::ERR_SSL_PROTOCOL_ERROR): SSL protocol error."
<_br_> adimania: Unicorn is a socalled application server. If you want SSL/TLS capability, I strongly suggest not relying on unicorn alone, but rather use it as a reverse-proxy together with some proper proxy.
<atmosx> adimania: I miss the point where you mentioned SSL
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<Kelet> HAPPYFUNBRO, Maybe your root password is wrong
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<atmosx> adimania: unicorn can not handle HTTPS directly from what I've know. So either you're going for a dirty hack or you'd better of off use nginx
<atmosx> which is very simple really
<Kelet> I sincerely hope that isn't your actual root password ._.
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<atmosx> use a socket on unicorn and map-it on the nginx config
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<_br_> I think puma can do SSL sockets out of the box. Not sure if Unicorn/Rainbows do that atm.
<adimania> _br_, I totally agree with you. We have an application which checks for ssl explicitly. Now my upstream, http://unicorn, fails this check. That is why I was wondering
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<_br_> Quite interesting btw. if you look at shootouts between Unicorn/Rainbows/Puma etc.
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<_br_> I still think not using a battle tested proxy and only app server alone is a bad idea.
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<kaspergrubbe> Anyone sufficient in Ruby that could take a look at this: https://gist.github.com/kaspergrubbe/6105698 how do i get it to execute the method within the scope of the Worker class?
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<dobry-den> kaspergrubbe: wouldnt it make more sense to initialize Worker with a name?
<dobry-den> puts Worker.new("Kasper").hello
<dobry-den> oh duh, it's just a toy example since you want to pass in arbitrary work
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<kaspergrubbe> dobry-den: Sure, but the real life example is a bit more complicated
<kaspergrubbe> yes :-)
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<dobry-den> maybe look at instance_eval and yield?
<dobry-den> im rusty
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<kaspergrubbe> good idea, I will try to look into that, thanks
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<kaspergrubbe> yes :-)
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<kaspergrubbe> dobry-den: If you are interested i've updated the gist with a solution. TL;DR: instance_eval worked like magic on my block :)
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<Paul-Atreides> besides rails and sinatra, what are some web frameworks you guys would recommend?
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<_br_> Paul-Atreides: Well, depends on your use-case. Padrino ?
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<Paul-Atreides> _br_: im testing padrino. it's for a site a guy and i are going to work on.
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<ericboehs> Is it possible to make the hotlist only count mentions?
<zendeavor> smells like rails
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<ericboehs> Oh man.. not at all.. I thought I was in #weechat ! haha
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<stegosaur> hi, i have a hash and my keys have - characters in them... i need to get the value and doing hash[my-key] will error out because of the hash
<HAPPYFUNBRO> why is this chef / ruby code executing improperly? http://pastebin.com/PcqqRsL0
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<stegosaur> how can i escape the -?
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<kold> I have an object with defined min/max ages for some Obstacles and am trying to get back only entries that a given age falls between. So far I can query them by this: Obstacle.all.find {|k| k.min_age >= 1 && m.max_age <= 5 }, but I'm not sure how to get the comparison of the age 3 in to this
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<suffix> how would I go about doing a File.exists?(/some/directory/somefile) where somefile would need to match a regxp?
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<danielrb> hey
<danielrb> say i have a method def test(param1, param2, param3) and i want to call this like so:
<danielrb> test(params_array_or_hash)
<danielrb> how cn i do that?
<jblack> def test(myhashinput)
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<danielrb> oh
<danielrb> in python there is a way to do it though
<danielrb> using kwargs or something
<jblack> Right, just pass in the variabl. it just works.
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<jblack> def usehash(ahash) ahash.each {|k,v| puts k,v,'--'}; end
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<jblack> usehash({:one=>1, :two=>2})
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<jblack> Sure, you can switch over to passing a hash without problem
<danielrb> so if i just call it with success?(p_params) it'll work?
<danielrb> that's great
<jblack> yeah, though you'll have to change self.success to use p_params[:payment_status] and such
<danielrb> oh
<danielrb> okay
<danielrb> also, any suggestions to clean up the success? method
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<jblack> nothing like using payment processing and a new language at the same time. Your customers will love yoU!
<danielrb> lol
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<jblack> I don't care much for that if statement. I think you can replace it with...
<jblack> return thisthing && thatthing && theother
<danielrb> oh yeha
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<danielrb> *yeah
<danielrb> gotta love ruby
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<jblack> I'm not sure you know what it's going to return if your if statement evaluates to false.
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<jblack> I think that would be false, actually, but feels like you kinda got lucky on that
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<danielrb> alright
<danielrb> thanks
<jblack> np, dude. =)
<danielrb> :)
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<BlakeRG> how do i add an attribute reader to a class i am extending?
<BlakeRG> rather than just overriding the existing list with my own
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<jblack> BlakeRG: They're not additive for you?
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<BlakeRG> jblack: won't this just overwrite the list of attribute readers in the class it's extending? http://pastie.org/private/gziutisjw8zh0ztradp3q
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<BlakeRG> :alert, :badge, :custom, :sound, :content_available all exist in the base class, i just want to add on :URL
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<jblack> I think if you do attr_reader :URL, your subclass will have reader methods for all of them.
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<jblack> why not test with some throwaway code? =)
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<BlakeRG> i'm not even sure i know how to test for that jblack, sorry
<BlakeRG> suppose i could just see if it bombs
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<zendeavor> use a repl
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<jblack> just make a trivial class with some attr_readers, subclass it with one more, and see what you get. =)
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<BlakeRG> what method is best for listing getters in a class
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<lectrick> BlakeRG: Since the getter creation methods are just macros that make normal methods, you're better off calling .attributes on an object after you .new it
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<cr3> is there a way to get values for multiple keys in a hash in one call?
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<lectrick> BlakeRG: You can probably filter the methods by <Class>.new.methods.select{|m| m.to_s =~ /=$/}
<lectrick> Those are only the setters though
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<BlakeRG> oh, very interesting lectrick, that is why i can not see the methods
<lectrick> BlakeRG: Yeah, there's no special "getter" or "setter" methods. They're all just "methods". But there ARE instance variables, which you can "ask" an object what it has.
<BlakeRG> i'm sitting here running .methods on an un instantiate class
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<cr3> aha! I was looking for values_at
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<lectrick> BlakeRG: I think you can also do Class.instance_methods... although now I forget if those are the "class instance" methods (aka "class" methods)
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<lectrick> BlakeRG: Yeah, Classname.instance_methods are the instance (instantiated object) methods available to new objects of that class.
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<lectrick> BlakeRG: Note that if you ONLY want the instance method defined against that class (and not any of its superclasses via inheritance), you have to pass in "false" to that call. so Classname.instance_methods(false)
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<BlakeRG> ah, perfect lectrick exactly what i needed
<BlakeRG> thank you so much
<scriabin> what's the best way to get ruby-1.9.x on rhel 5.8? Is there a best-prectices approach?
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<BlakeRG> the key was realizing that these aren't object members but macros that setup getters/setters
<lectrick> BlakeRG: You're welcome. Ruby has a good number of "introspection" methods that you can sort of find out about objects by asking them questions like that, via methods
<lectrick> BlakeRG: Yep. And you can also define your own macros that do so :)
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<lectrick> They're just class methods
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<BlakeRG> cool lectrick all of my getter methods are indeed inherited by my sub-class
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<BlakeRG> .instance_methods is what i needed
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<lectrick> good. go play :)
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<rien_> how do I properly handle an exception so that execution proceeds as normal after then begin/rescue/end block?
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<matled> rien_: if you don't return/exit/... in the rescue execution proceeds as normal
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<rien_> matled: hmm ok. I think it was a crazy moment I was having with rspec matching regexps from an exception's message :)
<rien_> matled: thanks!
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<seivan> Hmm, any frameworks for making CLI applications? A recall a few but it's been a while.
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<Nilium> CLI meaning command-line interface or common language infrastructure?
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<gazarsgo> like getopts wrappers ?
* Nilium prods seivan with a stick
<seivan> Nilium: The former :)
<Nilium> Like curses or ncurses?
<seivan> I'd hope it set up best practices and a skeleton, combined with tests. Also are there better way to pipe out to external applications other than ``
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<seivan> Nilium: Simpler, and in Ruby =)
<Nilium> So scaffolding or whatever (I think that's the term the railsmongers coined) rather than the library/gem meaning of framework?
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<Nilium> Also, the curses bindings are pretty Ruby-ish.
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<lectrick> So I can't convert a Float to base_16 via (float_instance.to_s(16))... Is this for mathematical reasons? (maybe floats don't have a clear definition in other bases?)
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<Nilium> Far as I know, there's no base-16 style float
<lectrick> yeah i was afraid of that
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<Nilium> What you can do is [float].pack('f').unpack('L').to_s(16), but that's ugly. Could also just write a C function for it.
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<seivan> Nilium: Why are you making it so overly complicated.
<Nilium> Making what overly complicated?
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<Nilium> Also, I forgot part of the unpack thingy, but whatever.
<seivan> I was just asking for something that would setup a project skeleton with tests and have some helpers for best practices when writing the interface
<lectrick> Nilium: [Math::PI].pack('f').unpack('L').first.to_s(16) ... ok that works. forgot the .first
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<lectrick> although no decimal there :O
<Nilium> seivan: Because I assumed at first you meant framework as in gem/library.
<Nilium> I can't help you with the scaffolding thing, since I'm not aware of anything for that.
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<seivan> Nilium: So what gem would you recommend for that?
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<Nilium> For CLI UI stuff, I'd recommend curses or ncurses-ruby. For other stuff, like argument parsing, I'm not aware of any gems, but that's 'cause I haven't looked.
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<seivan> b.com/visionmedia/commander
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<Nilium> lectrick: As far as a C function goes, you could do something like: VALUE f_as_i(VALUE rfloat) { const double float_value = NUM2DBL(rfloat); return INT2FIX(*(const int32_t *)&float_value); } /* I think */
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<Nilium> Wow C does not translate well to a single line message on IRC.
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<Nilium> Granted C doesn't look very nice regardless.
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<Nilium> That looks nice.
<Nilium> Though I fault it for using the term 'DSL'
<seivan> Hmm
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<seivan> What is the best way to pipe out to an external application other than ``
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<Nilium> Well, what do you want to do aside from just execute something?
<Nilium> In general, I'd say use the Process module if you can, though, since it gives you better control over this stuff.
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<endash> Long time dev, first time irc chatter. Running into a bizarre, bizarre issue and hoping someone can help me figure out what's going on.
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<endash> I have a User object, which has a balance. I have a Role class, which is a subclass of Module. I instantiate Role, with a block, and then extend a User (Alice) with that Role/Module
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<bauerbob> hi. i've got an optional parameter in my opts hash, opts[:check], it is boolean. now in my function i want to set check to opts[:check] if present, otherwise to true. my dumb first try was: check = opts[:check] || true, which is always true (because nil || true is the same as false || true). what's a simple/beautiful way to make it right?
<endash> if I call alice.balance directly, it works fine, the balance is 100. I also have the function spit out the object signature. If, however, I call the method #deduct_funds, which is part of that Role/Module, calling #balance inside #deduct_funds spits out the same object signature, so it is still alice we're dealing with, but all of its properties are gone
<endash> furthermore, calling self.balance inside #deduct_funds works as expected, and alice has all her properties
<bauerbob> my 2nd try was check = opts[:check].presence || true, which is also pretty dumb, of course
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<Nilium> bauerbob: Best way is probably just to use a conditional. If not that, then `.. = !h[:check].nil? ? h[:check] : true` which is still a conditional but at least not as wordy.
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<Nilium> I'd still recommend a conditional over the ternary though.
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<Nilium> Saying conditional over the ternary is weird since they're both functionally mostly the same thing.
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<Nilium> endash: You'll probably want to provide some sort of example code and expected input and output.
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<bauerbob> for a moment i thought that check ||= opts[:check]; check ||= true; must work
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<bauerbob> but it also doesn't :-(
<endash> yarrrrrrr
<Nilium> Nah, that'd just be true.
<bauerbob> alright, i go with the conditionals :-)
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<Nilium> h[:check] || !h[:check].nil? might also work.
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<Nilium> That way if it's nil it's true and if it's not nil it's true or false.
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<bauerbob> uhm... i think i won't understand that anymore when i take a look at it in a few weeks
<Nilium> Hm, but then it'd be true if check was false..
<Nilium> Damn you, or.
<endash> oh jiminy
<endash> I wasn't using `self.` to call setters so I was creating local vars, and that's what was causing the supposedly anomolous behaviour. Total brain fart.
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<Nilium> f || (f.nil? && true) ← Maybe?
<Nilium> Where f is h[:check]
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<Nilium> >> [nil, true, false].map { |f| f || (f.nil? && true) }
<eval-in> Nilium => [true, true, false] (https://eval.in/39588)
<endash> bauerbob: I was JUST thinking of this exact issue earlier
<bauerbob> ....and your solution is....?
<Nilium> bauerbob: That look like the input/output you want?
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<endash> thinking thinking
<Nilium> nil -> true, true -> true, false -> false?
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<bauerbob> uhm... yes :-)
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<Nilium> Ok, then f || (f.nil? && true) it is.
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<Nilium> Or maybe just f || f.nil?
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<Nilium> Yeah, scratch the and, it's just f || f.nil?
<Nilium> I don't know why my brain thought that was necessary..
<Nilium> >> [nil, true, false].map { |f| f || f.nil? }
<eval-in> Nilium => [true, true, false] (https://eval.in/39591)
<endash> check.nil? || check
<endash> was my solution
<endash> oh
<endash> and is also dumb
<endash> brain farts all around
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<endash> never mind
<Nilium> Same result, so endash already did it right
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<endash> that's also your solution
<endash> oy today is not my day
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<endash> #false#.nil? || #false# => false #true#.nil? || #true# => true, #nil#.nil? || #nil# => true
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<endash> i'm now second guessing everrrrrything
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<bauerbob> i go with f.nil? || f
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<bauerbob> thank you, guys!
<Nilium> That just means you need more caffeine/cocaine/kittens
<bauerbob> lol
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<Nilium> I do not recommend the cocaine option.
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<zendeavor> at least not on freenode
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<endash> its a hell of a drug
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<workmad3> kittens > cocaine
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<idlemich1el> is there a way to check how much ram is free on the system from within ruby?
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<tjbiddle> Has anyone used Thor for building a CLI before? Was wondering if I can have both a subcommand and action for a command?
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<onewheelskyward> idlemich1el There's a link to a gem in this SO article that might be useful. http://stackoverflow.com/questions/4029391/how-do-you-find-the-physical-memory-free-on-the-machine-in-ruby
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<endash> anyone much experienced with DCI?
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<bricker> Is it possible... hear me out here... to define public instance methods that will be accessible on instances of a class but *not* its subclasses?
<bricker> That's silly, I know
<bricker> dumb question
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<DylanJ> per instance
<onewheelskyward> It sounds like you don't actually want the subclasses to be subclasses of that object, honestly.
<DylanJ> ^
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* endash nods
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<bricker> eh
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<endash> open/closed principle
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<bricker> I guess this is more of a rails-specific problem now that I think about it, since it's using some active record functionality that's causing the problem I'm having
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<endash> AR itself shouldn't be a superclass IMO
<endash> kinda bad design on their part
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<sdegutis> [crosspost from #ruby-lang] is there something like rb_funcall2 that takes a Ruby array for args, and splats them?
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<mansi> Hello, anybody here used css selector in Selenium webdriver during automation testing using Ruby?
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<mansi> <div class="ddsection ddrefreshable ddinsertfreetext ddremovable" style="padding: 4px;" id="_d4b99a9f-d1c8-4587-94e2-5ee95ebf1f76">
<mansi> <span class="ddsectiondisplay" style="font-weight: bold; text-decoration: underline;">This is new TITLE</span>
<mansi> I have my web code as above
<mansi> and I wish to get the element using "This is new TITLE" as the argument/parameter
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<mansi> I tried - driver.find_element(:css, "span.ddsectiondisplay") or driver.find_element(:css, "div.ddsection ddrefreshable ddinsertfreetext ddremovable span.ddsectiondisplay")
<mansi> but none worked for me
<mansi> Am I missing something here?
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<cr3> how can I convert a function that yields values into something that I can use like an array?
<ericwood> you want to convert a function into an array?
<cr3> for example, I'd like to be able to use .select or .map on the values yielded by the function
<ericwood> have the function return an array
<michael_mbp> hey _br_, you about?
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<cr3> ericwood: I'd really like to iterate though
<ericwood> idk what you want
<ericwood> someone else can take over
<cr3> ericwood: "idk"?
<cr3> nm, "I don't know" :)
<ericwood> lol
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<michael_mbp> _br_: I've yet to write up the README/public API etc. https://github.com/bsodmike/currency_parser
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<dagnachew> hi all
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<ismael_> hi
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<dagnachew> how are you ismael_
<ismael_> good. You?
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<dagnachew> I have finaly setteled on ruby since It's been long time I was not decided wich language and ecosystem to choose
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<ismael_> great. Good for you. So ruby is now your main programming language?
<dagnachew> ismael_, I work in non related job I was more or less compfortable with 40 000 can a year
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<dagnachew> but I have a college degree in cs way back 2003 :(
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<dagnachew> and I was lousy hence fair paid job in governement
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<dagnachew> not it related
<L8D> So what is the controversy over the {key:"value
<L8D> "} syntax shortcut from 1.9?
<L8D> I never understood it
<DanielRb> oh
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<dagnachew> but I think ruby maybe my ticket to billion $ starup :)
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<ismael_> happiness mathers. I could earn away more but I'm happy programming in ruby and for now this is what I want to do also
<dagnachew> ismael_, may I ask what degree you hold
<dagnachew> ?
<DanielRb> i don't like the new syntax either
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<DanielRb> but it's not huge of a deal
<dagnachew> ismael_, I want to build something of a betting decision maker
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<ismael_> dagnachew I finished my licenciature this year actually, but also started working
<dagnachew> ismael_, like a dashboard of given sport with teams and player stats
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<dagnachew> licenciature what his this first time I heard
<dagnachew> a computer science license ?
<L8D> ruby is all about choice and freedom though
<ismael_> DanielRb new syntax is awesome. I never got used to the old one, but it like the way it's clean now
<L8D> Also, I never use anything besides symbols in my hashes
<DanielRb> i find => easier to type, that's all
<ismael_> dagnachew kinda, information systems
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<DanielRb> symbols are great
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<dagnachew> L8D, but I fear that I will hit wall when scaling come calling altough I am far far far away from scaling issues ...maybe by the time I will need scaling ruby will remove gil and rubinuis will be the defacto implementation :)
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<ismael_> dagnachew: I'm not considered engineer but I don't need that for nothing
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<L8D> rubinius isn't a defacto implementation
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<L8D> the only defacto implemenetation is mri
<ismael_> btw, I got my degree on Portugal. So it should be a different system
<rien_> L8D: I think "de facto" doesn't mean what you think it means ;)
<ismael_> he means "standard" or "default" ??
<rien_> mri is the de facto specification of ruby
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<rien_> not implementation
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<rien_> as in "nothing else specifies the ruby language but the mri implementation"
<ismael_> mri is the mother of all rubies
<L8D> defacto means "actual"
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<rien_> "de facto implementation" doesn't mean anything
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<rien_> L8D: no, it means "established as (the adjective) by means of its own existence"
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<ismael_> "defacto" in portuguese means "actually"
<L8D> ^
<ismael_> ^^
<rien_> but it doesn't come from portuguese, it comes from latin.
<ismael_> so it does means something
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<ismael_> mean
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<L8D> in latin, it means 'literally'
<rien_> "literally" in latin is "ipsis litteris"
<rien_> so no
<wisconsin> "in fact"
<rien_> or "litteratim" you could maybe say
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<L8D> in reality
<L8D> actual
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<rien_> L8D: yes, "in reality", you got it now!
<ismael_> sure, portuguese born from latin
<L8D> but mri is sooooo much more commonly used than any other implementation
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<popl> I think you guys need MRIs. :P
<endash> you can say anything in latin in 10 different ways
<wisconsin> mri is dead
<ismael_> yeah, I mean, actually in the context of "I'm actually happy about this. For real!"
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<endash> and then rearrange all the words just for fun
<L8D> wisconsin: wut
<wisconsin> long live yarv
<popl> Yarp?
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<popl> Yaaaarp.
<L8D> yapp?
<rien_> endash: yes, but that does not mean that every latin expression means 10 different things.
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<superscott[8]> what's the most update to date and/or working DBI gem? ruby-dbi and rdbi seem to be abandoned?
<L8D> I could say "I have a water bucket" like "I own a water bucket", "I have a bucket full of water"
<L8D> etc.
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<ismael_> some of them have 23+ different meanings
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<endash> problem i thin is that we use the word "literally" metaphorically to mean "in reality".. (and I don't mean people who can literally eat a horse )
<rien_> ama aquae est mihi (I have a bucket of water) :)
<rien_> habeo ama aquae (same thing)
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<n_blownapart> sorry I'm somewhat slow. but what happens when you take away self from line 9? http://pastie.org/8188159 thanks
<zendeavor> i have a thing. a thing is in my possession.
<zendeavor> whatever.
<endash> and there's a certain art to picking out the meaning you want… for instance, my university's motto has the word "Iustitiae" in it, but reads a lot better if you translate it as "righteousness"
<endash> instead of justice
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<rien_> fun language indeed
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<n_blownapart> pax
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<ismael_> n_blownapart: it still works. And it does exactly the same thing
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<n_blownapart> ismael_: thanks, this is tied into rspec tests. people on rails were ignoring me understandably
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<n_blownapart> I'm having trouble understanding how taking away the self affects the tests outcome for bacon_instance.edible? can you switch over to rails and help me ismael_ ?
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<endash> n_blownapart: assignment is assumed ot be a local variable
<endash> so `expired = true` would create a local variable called `expired` and set it to `true`
<wisconsin> has anyone tried this? http://rubyluwak.com
<n_blownapart> endash: thanks let me ponder that.
<endash> totally tripped me up earlier today, and I've been programming ruby for 6 years :P
<endash> a missing self can reaaaalllly drive you crazy until you find it
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<n_blownapart> endash thank God that is reassuring. would you mind looking at the whole thing if you have time?
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<endash> sure
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<n_blownapart> endash: beautiful its here: http://pastie.org/8188041
<terrellt> bacon_spec.rb++
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<terrellt> Just for the name.
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<n_blownapart> endash when you remove the self you get the failure at the bottom of pastie. I don't see how the removal affects the outcome of the edible? method
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<n_blownapart> endash: I went through an entire good ruby book and it is alarming that I am still having this much trouble.
<endash> this is how i rewrote it
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<endash> expired is nil by default
<endash> and !nil is true
<endash> so expired = true doesn't change self.expired, which remains nil, and thus the bacon is edible
<wisconsin> self.expired = true calls a method
<wisconsin> expired = true is a local variable
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<ismael_> endash: it will look for a local variable with that name to assign to it. If it does not exist it will search for a method
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<wisconsin> ismael_: no, that will always be a local variable assignment
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<n_blownapart> ismael wisconsin endash holy smokes this shit is tough
<terrellt> Not really.
<terrellt> Use self.
<ismael_> endash: if there where a method param with that name self would be required because there is a local variable with that name
<terrellt> Mission complete.
<endash> ismael_: nope
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<endash> just doesn't work that way, at least 2.0
<ismael_> oh dude... I'm going to try that out but I'm sure about what I'm saying
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<terrellt> ismael_: That would kind of suck.
<terrellt> ismael_: That'd mean I could never define a local variable with the same name as a method setter.
<n_blownapart> ok well now I'm really confused.
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<endash> just tried this in 2.0 and 1.9.3
<ismael_> crap, I guess your are right
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<ismael_> you are right
<ismael_> I don't know how this idea got in my mind
<endash> its a bit of a trip up :/
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<n_blownapart> I will never ever understand ruby
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<ismael_> sorry for misleading
<Nilium> Well, I finally got tired enough of having to navigate to the ruby header directory that I just made a script for it.
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<n_blownapart> no worries at least it inspired debate
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<terrellt> I don't think it's a trip up.
<terrellt> I think it's good that you have to be explicit about setters.
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<endash> i'm not saying it's *bad* just that if you don't know what's going on you can really be scratching your head
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<n_blownapart> http://pastie.org/8188041 so could you all walk me through. how does the removal of self affect the first test , because a constructor is in each test.
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<Nilium> Explicitness is next to mild annoyance, finger cramps, and godliness.
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<n_blownapart> separate* constructor
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<n_blownapart> i.e each test has it's own object instance, so would !expired still be true?
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<n_blownapart> wouldn't*
<ismael_> I'm now installing 1.9.2 to be sure self is always required
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<terrellt> n_blownapart: ...Is your test actually erroring like that?
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<n_blownapart> terrellt: after the removal of self. I left it in the failure is without the self.
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<ismael_> n_blownapart: without self it will assing to a local variable instead of your instance variable
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<terrellt> So when you remove self from expired! you're essentially doing def expired!; return some_other_variable_im_not_storying_anywhere = true; end;
<terrellt> Storing, too.
<ismael_> n_blownapart: sorry for misleading you earlier
<n_blownapart> terrellt: part of the problem is that I've never used tests, and they are warping my brain. no worries ismael_
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<n_blownapart> terrellt: ismael_ thanks !
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<terrellt> I like to use self whether or not it's -actually- required, so I know exactly what I'm calling a method on.
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<ismael_> terrellt: plus 1
<ismael_> terrellt: do you always use self or just on assignments?
<terrellt> Always.
<ismael_> terrellt: even for normal methods? Or just getters and setters?
<terrellt> Even for normal methods.
<terrellt> Although, what -isn't- a getter or setter?
<ismael_> hm. I don't approve that
<ismael_> command methods
<terrellt> Such as?
<ismael_> for example "run"
<terrellt> Yes, self.run
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<ismael_> and why you do that? I think that's just polution. I understand why one would use self on getters and setters
<ismael_> to make sure those does not seem local variables
<terrellt> So that I can look at that line and say "okay, I'm calling the run method on this object." instead of looking up to make sure I'm not returning the value stored in the local variable called "run"
<ismael_> but using self on every method call seems just too much and uneccessary
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<terrellt> It might be okay if you were to explicitly include the parenthesis for the run call.
<terrellt> But that's less pretty.
<ismael_> on my code most of the time I don't have that problem, my making small methods with 5-10 lines max
<ismael_> *by
<ismael_> *by making ....
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<terrellt> Sure, it's not -terribly- onerous to look up most of the time, but I honestly feel explicitness is good practice - whether or not the language lets you avoid it.
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<ismael_> also, proper named methods and variables help a little
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<ismael_> and there is one gain on leaving self out. You abstract that
<terrellt> Lol, I suppose you could argue that it makes it easier to pull out a local variable.
<ismael_> and your code does not know if it is a method or instance variable and you can change it on the future instead of removing or adding a self
<ismael_> I know this is kinda stupid but leaving self out
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<ismael_> seems good to me
* terrellt shrugs.
<terrellt> As long as it's consistent.
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<ismael_> I'm remembering now about a screencast I saw about this. Well, not directly about this but it was where I got this ideas from
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<ismael_> I think it was a ruby tapas episode
<ismael_> about extracting everything into a method
<ismael_> have you seen it?
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<ismaelrb> testing this thing
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<mootpointer> ismaelrb: Greetings.
<ismaelrb> mootpointer hi
<ismaelrb> what irc client app do you guys use?
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<Tricon> ismaelrb: Linkinus.
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<ismaelrb> I'm trying Textual and irssi at the same time
<n_blownapart> limechat
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<DylanJ> ismaelrb: weechat. longtime irssi use until a few months ago
<ismaelrb> Textual is sexy but I won't pay for a irc client
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<v1rr3n> weechat is looking awsome with my xresources
<ismaelrb> DylanJ weechat seems interesting. At least seems to be better then irssi
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<n_blownapart> ismaelrb: I'm a noob but limechat is great and free
<ismaelrb> do I need to learn a lot of key bindings to use weechat ?
<n_blownapart> for osx
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<DylanJ> ismaelrb: it's pretty fugly ootb. it grew on my though. maybe i got lazy.
<v1rr3n> ismaelrb: no its mostly f keys
<bl00dsh0t> do you have any tutorials on net-ping?
<ismaelrb> n_blownapart thanks. I've used limechat in the past
<n_blownapart> are you ismael_ ?
<Tricon> I like irssi, but I like that Linkinus embeds images and videos.
<ismaelrb> n_blownapart yes ;)
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<DanielRb> Macruby looks awesomeone, anyone here have experience with it?
<DylanJ> kinda what mine looks like
<DanielRb> *awesome
<n_blownapart> I need to beg your assistance one last time re: discussion ismaelrb
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<n_blownapart> if you take away self, !expired cannot read #expired! because it is merely defined with a local variable and no instance?
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<ismaelrb> Tricon wow. Seems to be the best for now. But I'm not into a paid client.
<n_blownapart> ismaelrb ^^
<DanielRb> weechat looks nice
<Tricon> DanielRb: I've done some MacRuby.
<n_blownapart> shit I mean edible? cannot read expired! ^^ ismaelrb
<ismaelrb> DylanJ looks really awesome for a terminal client
<DanielRb> Tricon: great, what's your experience with it? good, bad.. would you rather write in Objective-C or?
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<ismaelrb> DanielRb better go with rubymotion. It actually compiles into binary as a normal Obj-C app
<Tricon> DanielRb: I do like MR, and it talks directly to the Obj-C runtime layer, so it's fast, but... 1. I like Obj-C, 2. GC is deprecated in Cocoa (in favor of ARC), 3. It's hard to invest full time, for desktop/mobile applications, a language that doesn't let me disable the GC and manually manage memory.
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<Tricon> I really like MR for scripts that can talk to Cocoa, though.
<DanielRb> hmm, if only rubymotion was open source
<Tricon> Not a fan of RubyMotion, for the record.
<ismaelrb> DanielRb I've just started the last week into rubymotion and I feel I need to learn everything in Obj-C but still I think it's worth it because you have the best of both worlds. Native apps and the ruby's dynamic and beautiful language
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<DanielRb> i do have a bit of experience with Objective-C and Cocoa though, so i think i'll give it a go
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<ismaelrb> n_blownapart sorry. I got lost
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<v1rr3n> Is there no portable way to get native apps on all platforms and avoid MR or rubymotion? Why would you need them?
<ismaelrb> n_blownapart maybe you should try stackoverflow It's easier to help there
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<v1rr3n> I'm not a Mac user so I'm just wondering?
<n_blownapart> ismaelrb: do they have a chatroom?
<DanielRb> why is ruby motion so expensive lol?
<DanielRb> in AU it's $223+
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<DanielRb> especially for students + people who don't make any money
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<qhartman> Is there a more idiomatic way to to do this sort of test on a variable: 'if !foo.nil? and foo == "bar"'
<ismaelrb> DanielRb I'm having a hard time because I'm a noob at cocoa and app development but I already feel rubymotion worth it because you can do everything you are used to in ruby. I just need to learn the framework better.
<qhartman> essentially I only want true if foo== bar, but I'm not guaranteed that the variable will be set when I get it
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<DanielRb> i see
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<ismaelrb> DanielRb I didn't pay for it, it was the company I work for. I know it seems a lot but is it?? I mean, it's a great peace of software and this way you get support and you know for sure it wont just get abandoned.
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<ismaelrb> n_blownapart they have but you need reputation to go in there. But you can just get post your question and wait. For sure you will get an answer there
<DanielRb> ismaelrb: for companies, sure.. it's worth it. but for students, it's just too expensive
<DanielRb> i
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<DanielRb> i've emailed them about a student discount, hopefully it's fair
<ismaelrb> DanielRb sure. I wouldn't buy it for personal use for sure