#ruby on 2019-11-01 — irc logs at freenode.irclog.whitequark.org

2019-10-22 15:51 havenwood changed the topic of #ruby to: Rules & more: https://ruby-community.com | Ruby 2.6.5, 2.5.7, 2.7.0-preview2: https://www.ruby-lang.org | Paste 4+ lines of text to https://dpaste.de/ and select Ruby as the language | Rails questions? Ask in #RubyOnRails | Books: https://goo.gl/wpGhoQ | Logs: https://irclog.whitequark.org/ruby | Can't talk? Register/identify with Nickserv first!

00:00 <havenwood> sudo su - psilly1; ruby -retc -e "puts Etc.getlogin" #>> pillyorigialnotsu

00:01 <havenwood> Etc.getpwuid(Process.uid).name #>> psilly1

00:01 <havenwood> Anyway, if they check logs, that's ^ a simple example. of Etc.getlogin being wrong.

00:02 <havenwood> Or just: Etc.getpwuid.name

00:02 <havenwood> &>> require 'etc'; Etc.getpwuid.name

00:02 <rubydoc> # => "ruby" (https://carc.in/#/r/7xhg)

00:02 <havenwood> &>> require 'etc'; Etc.getlogin

00:02 <rubydoc> # => "ruby" (https://carc.in/#/r/7xhh)

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00:49 <tomreyn> hi, sorry for the newbie question but i'm failing to find a proper answer: is it normaly to have those two ruby's in the path to the binary files? ~/.local/share/rubygems/ruby/ruby/2.5.0/bin

00:49 <tomreyn> and if not so, how can i make bundler not create this path?

00:50 <tomreyn> my expectation would be to rather see a path like ~/.local/share/rubygems/ruby/2.5.0/bin

00:50 <tomreyn> this is with ruby 2.5.1p57

00:50 <havenwood> tomreyn: How'd you install it?

00:50 <tomreyn> Bundler version 1.16.1

00:51 <havenwood> tomreyn: Is your `gem env gemdir` as expected: ~/.local/share/rubygems/ruby/ruby/2.5.0

00:52 <havenwood> tomreyn: say more about how you setup Ruby and on what kind of system?

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00:52 <tomreyn> havenwood: first of all i rm -r'd ~/.local/share/rubygems, then i did a git checkout of a ruby application (wpscan) and then i ran "bundler", then "bundler install"

00:52 <tomreyn> $ gem env gemdir

00:52 <tomreyn> /var/lib/gems/2.5.0

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00:53 <tomreyn> but i do prefer to keep things in the user scope

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00:54 <havenwood> tomreyn: For example, my $GEM_HOME is ~/.gem/ruby/2.7.0 so my bin/ dir is ~/.gem/ruby/2.7.0/bin.

00:54 <tomreyn> env | grep -Ei 'RUBY|GEM|BUNDL' returns nothing for me

00:55 <tomreyn> should i explicitly set GEM_HOME then? but this does still not explain why i have this ruby/ruby without the explicit declaration

00:55 <havenwood> tomreyn: I'm using chruby, which set GEM_HOME. You can set GEM_HOME yourself.

00:55 <tomreyn> this is an ubuntu 18.04.3 system, if it matters

00:56 <havenwood> tomreyn: You can arbitrarily set the gem home directory. Did you install Ruby with apt?

00:56 <havenwood> tomreyn: How'd you install Ruby?

00:56 <tomreyn> yes, i installed ruby with apt

00:56 <havenwood> tomreyn: I'd leave it be. I'd assume the ruby/ruby is some convention but admittedly I've not noticed that before.

00:56 <tomreyn> readlink -f $(which ruby) returns /usr/bin/ruby2.5

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00:57 <tomreyn> i'm not sure about the convention, i don't see this anywhere else

00:57 <havenwood> tomreyn: But yeah, you have RubyGems install wherever you want or alternatively set --path on a per-project basis to have Bundler remember an alternative path.

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00:58 <tomreyn> i rather suspect that i misconfigured it at some point, but don't know where those settings could be stored

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01:01 <tomreyn> thanky you!

01:01 <tomreyn> err thank you!

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01:35 <hahuang65> is there an inverse method of `Enumerable#zip`?

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01:38 <leftylink> hmm. if it's specifically an Array, one can use `Array#transpose` to do the reverse of `Enumerable#zip` for non-arrays... perhaps one would have to do a map.with_object and do it manually

01:38 <leftylink> &>> [1, 2, 3].zip([4, 5, 6]).transpose

01:38 <rubydoc> # => [[1, 2, 3], [4, 5, 6]] (https://carc.in/#/r/7xid)

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03:41 <baweaver> New fun article out: https://dev.to/baweaver/deeper-magics-monoids-in-ruby-and-rails-324o

03:43 <adam12> baweaver: Ooh very nice.

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03:52 <adam12> I wonder with the release of Bazel 1.0, I'll finally get Sorbet on FreeBSD.

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05:10 <xall> How to write the equivalent in Minitest (from Rspec): `allow(ScoredPlay).to receive(:new) { |score, play| [score, play] }`?

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05:21 <xall> Seems like it might not be possible for Minitest mocks to return whatever is given. The docs show that the return value is explicitly required.

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05:26 <xall> so i guess the solution is to manually stub it out

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06:42 <dajonker> 2

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10:54 <Cork> anyone here managed to use WinRM to control a windows ad server?

10:55 <Cork> been trying to get it to work but it gives me a ton of problems

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11:01 <NL3limin4t0r> I'v used WinRM in a project to query a Windows only application via a powershell command.

11:01 <NL3limin4t0r> What's your current issue?

11:01 <NL3limin4t0r> Never tried anything with an ad server though.

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11:19 <ahmadn> Hello all. I have a quick Q. I am using omniauth and seeing that it correctly redirects to the callback url and everything working just fine. However I am noticing that sensitive data (such as state, token, etc) are being passed to the callback as query parameters. URLs get logged in many places. Isn't this a security risk?

11:19 <ahmadn> googling this didn't return anything useful.

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16:35 <davidw> I went ahead and filed a bug... https://bugs.ruby-lang.org/issues/16288 - it's kind of fun to chase this stuff down

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16:58 <adam12> davidw: Interesting bug report. Only on 2.6.6?

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16:59 <davidw> adam12, I see it with 2.5 too

16:59 <adam12> davidw: Running that test code triggers it?

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17:03 <davidw> adam12, no, running the sample rails app I have does. I need to clean that up just a bit and attach it

17:03 <davidw> I couldn't get a really simple test case :-/

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17:33 <barg> is it possible that gem list | grep sinatra doesn't show anything.. then I make a Gemfile that includes gem 'sinatra' and I do bundle install.. Then when I leave that directory and do gem list, that it shows sinatra?

17:34 <barg> i'd have thought it wouldn't show outside of that directory 'cos i thought bundle install would only install the gem locally

17:34 <adam12> barg: It doesn't install locally, unless you tell it to. There's a variety of ways, from --path to `bundle` and `BUNDLE_PATH` environment variable.

17:34 <adam12> barg: But by default, it installs to `GEM_HOME`

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17:36 <barg> thanks.. strange thing also is i had some directories with a Gemfile that mentioned sinatra.. I guess I hadn't done bundle install on such a Gemfile before?

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17:36 <adam12> barg: Possibly.

17:37 <barg> how might it be possible I could have used sinatra before but not had the gem installed?

17:38 <barg> maybe I reinstalled ruby and lost those gems, that's one possibility

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18:32 <NL3limin4t0r> barg: If you use RVM it might be because you switch Ruby versions. Each Ruby version has it's own gems installed (although minor Ruby versions might share gems).

18:33 <NL3limin4t0r> ^ 2.4.0 might use the same $GEM_HOME as 2.4.1 for example.

18:34 <NL3limin4t0r> However 2.4.0 and 2.5.0 most likely won't.

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18:37 <NL3limin4t0r> > echo $GEM_HOME #=> /home/johwen/.rvm/gems/ruby-2.4.1

18:37 <NL3limin4t0r> and when I swap to another directory

18:37 <NL3limin4t0r> > echo $GEM_HOME #=> /home/johwen/.rvm/gems/ruby-2.6.1

18:39 <jfhbrook> I got a weird one: I noticed that my rbenv-installed ruby 2.5.7 was using the 2.6.0 gems folder

18:40 <jfhbrook> like it was all working 🤷‍♂️ but it's extremely weird and I'm sure something is going to break on me eventually

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18:45 <NL3limin4t0r> Here you can see that 2.5.1 and 2.5.3 share the same $GEM_HOME behind the screens https://i.imgur.com/PTtYPMQ.png

18:45 <NL3limin4t0r> jfhbrook: That's indeed kinda strange.

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18:52 <jfhbrook> yeah, it's bizarre. no idea how or why it would do that, don't know enough about how rbenv and rubygems work yet

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18:58 <havenwood> jfhbrook: RubyGems uses the Ruby ABI number, which these days is MAJOR.MINOR.0.

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18:59 <havenwood> (Ruby 1.9's ABI was 1.9.1, iir.)

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19:05 <leftylink> oh hmm. this is not really about Ruby, it is more about regular expressions, but I'm not in #regexp so this is the only place I am in to talk about it

19:05 <leftylink> &>> /|/

19:05 <rubydoc> # => /|/ (https://carc.in/#/r/7xq6)

19:05 <leftylink> I was surprised to know that that is a valid regexp. but it makes sense I guess

19:05 <leftylink> since /A|/ is valid, obviously /|/ would be valid too

19:05 <leftylink> "obviously"

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19:06 <leftylink> it was probably not obvious if I only just found out about it

19:06 <leftylink> only obvious in hindsight.

19:06 <havenwood> leftylink: it matches empty OR empty

19:07 <havenwood> &>> /||/ # empty or empty or empty

19:07 <rubydoc> # => /||/ (https://carc.in/#/r/7xq7)

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19:07 <havenwood> &>> /||/s # case insensitive empty or empty or empty

19:07 <rubydoc> # => /||/ (https://carc.in/#/r/7xq8)

19:07 <havenwood> :P

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19:08 <leftylink> luckily, ruby String#split, when given a string, will not silently convert it to a regular expression. woe betide any languages whose String#split equivalent does.

19:08 <leftylink> when they try to split on a single pipe

19:09 <leftylink> they are in for a nasty nasty surprise

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19:12 <leftylink> ... and predictably, there are stack overflow questions about why splitting on a single pipe in that(/those) language(s) do(es) not work

19:12 <leftylink> er, wait, "does" is always the correct word in that sentence

19:12 <leftylink> ... and predictably, there are stack overflow questions about why splitting on a single pipe in that(/those) language(s) does not work

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19:16 <NL3limin4t0r> Is that language JS?

19:18 <NL3limin4t0r> Never mind, just tested it out and JS doesn't silently convert strings in split to a regex.

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20:10 <jfhbrook> I haven't seen that anywhere

20:10 <jfhbrook> I work with javascript and python and have done scala in a past role

20:11 <jfhbrook> bash kinda doesn't count cause it doesn't have a regexp type anyway

20:11 <jfhbrook> I'd be curious to know perl's behavior - will learn someday

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20:14 <Rudolph> bash only has string types, but in [[ =~ ]] they're converted to a regex anyways

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20:20 <psilly0> Hello - Is there a way to spoof [Etc.getlogin] so i can change the User it displays to me? Maybe some system variable?

20:21 <Rudolph> havenwood: ^

20:21 <havenwood> sudo su - psilly1; ruby -retc -e "puts Etc.getlogin" #>> pillyorigialnotsu

20:21 <havenwood> psilly0: Try that ^

20:22 <havenwood> psilly0: Compare with: Etc.getpwuid(Process.uid).name #>> psilly1

20:22 <psilly0> thanks havenwood, sorry about yesterday i had to run and quit IRC

20:22 <psilly0> let me try this

20:22 <havenwood> Rudolph: thanks :)

20:22 <Rudolph> np :>

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20:25 <psilly0> hmmm still showing the orginal user i started the SSH session with

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20:32 <leftylink> that seems to be consistent with the claimed behaviour of "pillyorigialnotsu" - "originalnotsu" seems to imply that it'd be the original user the SSH session was started with

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20:34 <havenwood> psilly0: you switched users, and that isn't reflected - hence wrong

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20:35 <havenwood> psilly0: Just an example of it being wrong

20:36 <psilly0> i see

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20:37 <psilly0> is there a way to change Etc.getlogin to something custom i want

20:37 <psilly0> i logged in with psilly0

20:37 <psilly0> i want etc.getlogin to display psilly7

20:37 <leftylink> anything can be changed to whatever you want, really

20:37 <leftylink> &>> require 'etc'; module IAmSam refine Etc.singleton_class do def getlogin; 'sam' end end end; using IAmSam; p Etc.getlogin

20:37 <rubydoc> # => "sam"... check link for more (https://carc.in/#/r/7xrl)

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20:37 <leftylink> now you're sam, congrats

20:37 <psilly0> let me try

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20:39 <leftylink> so basically, the same way you would change any other function to return whatever you wnt

20:39 <leftylink> write the code for the function in such a wy.

20:39 <leftylink> s/wy/way/

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20:41 <animo8> Hi, I'm writing a Befunge interpreter and am facing an issue that's a bit hard to explain

20:42 <animo8> I need to call a private instance method from a class instance lambda variable that takes self as a parameter, or find a better design

20:42 <animo8> Should I send a gist of my code? it's a bit over 100 lines

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20:46 <psilly0> member:leftylink if thats the case ill just define a new function to pull from ENV variable $USER

20:46 <adam12> animo8: 100% use a gist. And make it easily reproducable. Ala, I can download it, run it here, and see any error if possible. Not many people want to parse through 100 lines of unfamiliar code :)

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20:46 <psilly0> thanks for your help dude

20:49 <leftylink> perhaps it is useful to say that `send` can call private methods. I make no judgment as to whether it's a good idea to do so, but possible.

20:49 <leftylink> &>> class A; class << self; attr_reader :f end; @f = ->i { i.send(:foo) }; private def foo; :foo_called end end; p A.f[A.new]

20:49 <rubydoc> # => :foo_called... check link for more (https://carc.in/#/r/7xro)

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20:59 <leftylink> also imagine my surprise when refine says `TypeError: wrong argument type Module (expected Class)` ... luckily stack overflow came to the rescue to show how it could be done

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21:09 <havenwood> animo8: Sounds like there might be a better design. :)

21:09 <animo8> havenwood: Probably. I'm trimming it and making it self-contained and then I'll upload it to gist

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21:25 <animo8> Here's my code, sorry in advance https://gist.github.com/omrisim210/a37c0c492f0463b8fbc80d13adc45b55

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21:26 <animo8> The problematic lines are 73 - 76

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21:27 <animo8> Because this is a megaclass one option would be to move the instructions hash to an instance variable and initialize it in the constructor, but that bloats the constructor (is that a bad thing?)

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21:30 <animo8> I don't think I'll ever have more than 1 instance of `Interpreter` so that's actually a feasible thing to do, but if I do that I'd prefer to make sure only one instance of `Interpreter` is active at any given time. Is that doable or should I just trust the programmer to use it correctly?

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21:32 <animo8> Also expanding on the initializer bloat issue, if I do init `@instructions` in the initializer Rubocop complains because the method is too long. Should I just mute that warning or is there a more idiomatic solution?

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21:35 <leftylink> I will mention that a `case` inside `step` would be able to handle the instructions, but I understand if it is done the way it is done (`instructions` hash) for some performance reason. I will have to trust that the performance was found to be important at that part

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21:37 <havenwood> animo8: Use a constant rather than class instance variable.

21:37 <havenwood> animo8: INSTRUCTIONS =

21:38 <havenwood> animo8: If you don't want to expose it externally, chase it with: private_constant :INSTRUCTIONS

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21:40 <havenwood> animo8: s.send(:direction=, Directions::RIGHT)

21:41 <animo8> leftylink: This way it's extendable at runtime (not useful for this language but I once tried to implement a forth-like language that could define new instructions/words). Also it just looks cleaner to me

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21:41 <animo8> havenwood: The constant solution is actually brilliant, no idea why I didn't think of that. Way simpler than my current kludge

21:41 <havenwood> animo8: I'd use #fetch instead of #[] when you know it exists

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21:42 <havenwood> animo8: INSTRUCTIONS.fetch(@cursor).call(self)

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21:42 <havenwood> animo8: Freeze INSTRUCTIONS for good measure

21:43 <animo8> havenwood: Doesn't your `send` solution violate encapsulation? I'd rather have as little ugly non-idiomatic code as possible and this just seems like a recipe for more trouble down the road

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21:43 <havenwood> animo8: Yes, was pondering which way to suggest "fixing" it but multitasking atm.

21:44 <havenwood> animo8: Just `exit` is `exit 0` and that's known so just `exit`. If you want error status, `abort` instead.

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21:45 <animo8> havenwood: IMO the explicit exit code is more readable

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21:46 <animo8> What do you mean by "error status"? AFAIK exit is for numeric exit codes and abort is for exit messages. Am I right?

21:46 <havenwood> animo8: Sure, it's fine. Like `return` in bash though I'd flag it in code review to use the default.

21:46 <havenwood> `return` instead of `return $?` even though the latter is explicit

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21:47 <havenwood> animo8: #abort is for a 1 exit status. if you pass an argument it'll STDERR it.

21:47 <animo8> havenwood: Hmm, nowadays I mostly write fish for shell config and <insert real language> for actual programs so my bash is kind of rusty. But I see what you mean

21:48 <animo8> havenwood: I see. Good to know about #abort!

21:48 <havenwood> animo8: So `exit` is for an exit status of 0 and `abort` is for an exit status of 1. if you need a specific non-zero/one exit status you can use `exit`. It's a nit in any case.

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21:48 <havenwood> animo8: #warn is nice to use over $stderr.puts since it respects -W warning level flags.

21:50 <havenwood> animo8: It's not *really* breaking encapsulation since you're calling from the inside—but still awkward.

21:51 <animo8> Yeah. I prefer the more idiomatic and prettier solution

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21:52 <havenwood> animo8: You could define private methods for each and return the symbol from each lambda.

21:52 <havenwood> animo8: That's probably closest to current design.

21:52 <havenwood> animo8: Then use metaprogramming to DRY up declaration of the private methods.

21:52 <animo8> I'll just make instructions a top level global

21:53 <havenwood> animo8: Don't define your own global variables.

21:53 <havenwood> animo8: Use constants.

21:53 <havenwood> animo8: It's pretty much an anti-pattern in Ruby to define your own class or global variables.

21:54 <animo8> I see. So just a regular constant

21:54 <havenwood> animo8: A regular constant with a frozen hash, keys pointing only to method name Symbols.

21:55 <leftylink> the question asked was to call a private method. of course we are going to see things like `send`. otherwise, what? you can refine in an attr_writer, I guess?????

21:55 <leftylink> &>> class A attr_reader :v; module AW refine A do attr_writer :v end end; using AW; SET = ->s { s.v = 5 } end; A::SET[a = A.new]; a.v

21:55 <rubydoc> # => 5 (https://carc.in/#/r/7xrt)

21:55 <animo8> Wait a second, now that I think about it making instructions a constant still doesn't fix my problem because it needs to call `direction=` on the Interpreter instance

21:56 <animo8> So the solution is to either make instructions an instance var (acceptable) or violate encapsulation (maybe acceptable?)

21:56 <havenwood> animo8: {'0' => :instruction_0, '>' => :instruction_right}

21:56 <animo8> havenwood: Oh, now I see what you meant. I'll have a go at implementing it

21:56 <havenwood> animo8: public_send INSTRUCTIONS.fetch('>'), self

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21:57 <havenwood> animo8: Then metaprogram away the definition of 0-9

21:57 <havenwood> '0'.upto('9').each { define_method ...

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21:58 <leftylink> &>> class A attr_reader :v; module AW refine A do attr_writer :v end end; using AW; SET = ->s { s.v = 5 } end; A::SET[a = A.new]; [a.v, ((a.v = 777) rescue :couldnt_set)]

21:58 <rubydoc> # => [5, :couldnt_set] (https://carc.in/#/r/7xrx)

21:58 <leftylink> confrming that the SET can set, but outside code can't

21:59 <leftylink> since it's not using AW ("A Writer")

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22:00 <leftylink> eh, better confirm that a.v's value is still safe after the set attempt

22:00 <leftylink> &>> class A attr_reader :v; module AW refine A do attr_writer :v end end; using AW; SET = ->s { s.v = 5 } end; A::SET[a = A.new]; [a.v, ((a.v = 777) rescue :couldnt_set), a.v]

22:00 <rubydoc> # => [5, :couldnt_set, 5] (https://carc.in/#/r/7xry)

22:00 <leftylink> ok

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22:01 <animo8> leftylink: That's actually pretty clever as well, but seeing as I might need to set other variables from instructions I think I'd rather implement instructions as instance methods and store their names as symbols in a constant `INSTRUCTIONS` hash

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23:29 <animo8> Hi again, I implemented the design havenwood suggested and am now facing another problem that I can't figure out how to debug

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23:30 <animo8> Sorry to be dumping code again, but here's the gist with the program and the error https://gist.github.com/omrisim210/2ee77e6a2133e14303ed68b950626cd0

23:31 <animo8> Ruby seems to be complaining about an arity error in the block I pass to `define_method` (at least that's what I understand from the error)

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23:42 <leftylink> since there's only one public_send, this should be pretty easy to track down

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23:47 <animo8> leftylink: So you're saying the arity error is in `public_send`? That's not what I understand from the error message

23:47 <leftylink> Directions.constants.each do |name|

23:47 <leftylink> @direction = Directions.const_get(name)

23:47 <leftylink> end

23:47 <leftylink> define_method "instruction_#{name.to_s.downcase}".to_sym do

23:47 <leftylink> oops

23:47 <leftylink> wrong paste

23:47 <leftylink> 1: from ./befunge.rb:144:in `public_send'

23:48 <leftylink> seems pretty unambiguous to me

23:48 <havenwood> animo8: you can skip #to_sym there

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23:48 <animo8> Huh, I was looking at the last line of the error but after tinkering with pry it seems that leftylink is right. Whoops!

23:49 <animo8> havenwood: Thanks for the tip, will do that

23:49 <havenwood> animo8: looking at it in use, I'd say switch to: 10.times do |n|

23:50 <animo8> Why is `#to_sym` not necessarry though? Does `define_method` implicitly call it?

23:50 <animo8> havenwood: I can see how `times` might look better than `upto` but is there a functional difference?

23:51 <havenwood> animo8: yes, it'll be integers - but that's nicer

23:51 <havenwood> animo8: hmm

23:51 <havenwood> yeah

23:51 <havenwood> animo8: it's like: 0.upto(90

23:51 <havenwood> animo8: it's like: 0.upto(9)

23:51 <animo8> Oh right, I forgot I was operating on strings

23:52 <havenwood> animo8: 10.times { |n| define_method("instruction_#{n}") { @stack.push(n) } }

23:52 <animo8> I'm just gonna have to call `to_s` when defining the method instead of `to_i` when pushing the number but whatever, I'll change it

23:52 <havenwood> animo8: #{} is a to_s

23:52 <animo8> Oh right, interpolation

23:52 <animo8> Yup

23:52 <havenwood> animo8: And no String is allocated, so that's a good solution.

23:53 <havenwood> no extra string*

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23:53 <animo8> Huh. It seems harder to keep track of allocations in Ruby than in C++ or Rust

23:53 <animo8> Well, thanks for the help

23:53 <havenwood> use the magic comment; # frozen_string_literal: true

23:53 <havenwood> animo8: nnp

23:54 <animo8> havenwood: I do use it, rubocop warns me if I don't

23:54 <havenwood> 👍🏽

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23:55 <havenwood> animo8: I'd put INSTRUCTIONs inside Interpreter class.

23:55 <animo8> Or I could make it private as it's not useful for any other code

23:55 <havenwood> animo8: From the outside, it'll be Interpreter::INSTRUCTIONs and from the inside just Interpreter.

23:56 <havenwood> animo8: Yeah, private inside Interpreter is reasonable.

23:56 <havenwood> But not top level.

23:56 <havenwood> animo8: It looks like Directions should be inside Interpreter too, but maybe that's just lost in translation from the full one.

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23:57 <animo8> No, that's the whole thing. I'm quite slow :p

23:57 <havenwood> animo8: You ca ndo: `@cursor = @grid.dig(0, 0)` instead of `@cursor = @grid[0][0]` to save a method call.

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