<crystal-gh>
[crystal] potatogopher opened pull request #3496: Rename Contributing.md to CONTRIBUTING.md (master...patch-1) https://git.io/vXZSR
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<FromGitter>
<sdogruyol> @redcodefinal congrats
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<FromGitter>
<phoffer> @sdogruyol I ran into an oddity with websocket routing that I’m not sure is a bug or just a limitation of `WebSocketHandler` being separate from `RouteHandler`… ⏎ I’m trying to have a sort of “subscription” web socket handler that looks like this: ⏎ ``` code paste, see link``` ⏎ Is this a bug or just a limitation? It’s not a big problem, I’m just working through Kemal web socket prototyping and trying to fully
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<FromGitter>
<raydf> @redcodefinal nice lib :).
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<FromGitter>
<paulcsmith> @sdogruyol What kind of middlwares are you reusing and composing that are so helpful? Sounds super interesting, but I'm not entirely sure how you are using them
<FromGitter>
<sdogruyol> think of the request - response lifecycle going from up to down
<FromGitter>
<paulcsmith> Do you also use them for finding and assigning values? I've been trying to figure out how to use middleware for that, but it doesn't really seem possible/nice since you'd need to open up the HTTP context and add instance variables with optional types for the things you assign. Or maybe I just don't know how to do it
<FromGitter>
<paulcsmith> That is super cool looking
<FromGitter>
<paulcsmith> So does Middlewares::User load up a user and assign it to the context?
<FromGitter>
<sdogruyol> indeed
<FromGitter>
<sdogruyol> well not `User` but `user_id` in my case
<FromGitter>
<paulcsmith> Ohh would you mind sharing that middleware? I've been trying to figure out how to do something like that
<FromGitter>
<sdogruyol> because for now you can't store `Object`
<FromGitter>
<paulcsmith> Ohh ok that makes sense
<FromGitter>
<sdogruyol> hold on
<FromGitter>
<paulcsmith> So in the controller/action you still need to grab the actual record from the DB
<FromGitter>
<sdogruyol> and this middlewares are super testable
<FromGitter>
<sdogruyol> @paulcsmith yep
<FromGitter>
<sdogruyol> this is actually for existence
<FromGitter>
<paulcsmith> Cool :D Thanks for sharing @sdogruyol. Reminds me of plugs in Elixir
<FromGitter>
<paulcsmith> Kind of a bummer that records can't be assigned to the server context, but I don't think that could really be done :( Not a big deal though. A lot can be done in middleware as you showed
<FromGitter>
<sdogruyol> yeah
<FromGitter>
<paulcsmith> Pretty awesome
<FromGitter>
<sdogruyol> someone else also said the same
<FromGitter>
<sdogruyol> looked like plug
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<FromGitter>
<redcodefinal> Hey guys, anyone have any experience with [stumpy_png](https://github.com/l3kn/stumpy_png)? I'm planning on writing some utilities on top of it, specifically for combining images, layering them one on top of the other, expansion, inflation etc. Wanted to hear if anyone here has any stumpy_png code they'd be willing to share.
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<BlaXpirit>
redcodefinal, i dont have much. but it's very simple, just pixels
<FromGitter>
<redcodefinal> @BlaXpirit neato thanks man
<BlaXpirit>
basically the only call i have is img[xx, yy].to_rgb8 lol
<FromGitter>
<redcodefinal> I am also having an issue with crystal being able to find stumpy. I put it into my shards.yml. I ran ```shards install``` and it downloaded ```stumpy_core``` and ```stumpy_png``` to the libs directory
<FromGitter>
<redcodefinal> However when using ```require "stumpy_png``` it says it can't find it.
<BlaXpirit>
redcodefinal, what directory structure
<BlaXpirit>
if your code is in src/ that may be it
<FromGitter>
<redcodefinal> yeah the code im running is in src
<BlaXpirit>
from my limited experience, i think itgoes to src only if it's a library
<FromGitter>
<redcodefinal> jeez you did a chipmunk implementation too, you are a busy dude
<FromGitter>
<redcodefinal> ah nice! not a bad solution
<FromGitter>
<redcodefinal> until windows support that is ;>
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<RX14>
BlaXpirit, isn't the problem just that @redcodefinal is running crystal from src/ instead of the root?
<FromGitter>
<redcodefinal> @RX14 yes that was exactly the problem
<FromGitter>
<redcodefinal> I thought shards were global, to the project, not needing to be in the root
<RX14>
the chat log is pretty confusing...
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<FromGitter>
<redcodefinal> So I got a basic copy paste working but I noticed that it won't combine transparencies. anyone know any good way to combine the colors if one is transparent? ⏎ ``````
<BlaXpirit>
oh, you need that functionality? I didn't think it would be needed for making a ... collage
<BlaXpirit>
combining colors needs a non-obvious formula. that library doesn't do it
<FromGitter>
<phoffer> How do I copy a file from one location to another? I see `IO.copy`, and that `File` inherits that class method, but I must be missing something because I can’t get it to work
<Papierkorb>
I have to figure out a way to profile my code. Is there something better than having a profile{ .. } method which logs Time difference?
<BlaXpirit>
well there are generic profilers for llvm probably but that can get messy
<Papierkorb>
Oh that's interesting. Running the torrent client in release mode has no issues keeping up with stuff, while the default mode one uses constant 100% on busy torrents
<Papierkorb>
100% CPU time*
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<FromGitter>
<redcodefinal> It's so weird having to think about the difference between compile time and run time after being in the interpreted world for so long
<FromGitter>
<redcodefinal> but so far I'm having a blast with Crystal
<BlaXpirit>
also typeof doesnt execute its argument
<FromGitter>
<redcodefinal> does it just take the last argument from the method for typeof
<BlaXpirit>
redcodefinal, no no, it's just that `p` returns its argument. and also the last expression is returned from the method
<FromGitter>
<redcodefinal> but it doesn't execute the method?
<BlaXpirit>
sorry for confusion
<BlaXpirit>
redcodefinal, it doesnt execute the method. it knows that with these types of arguments the method would've returned that type
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<FromGitter>
<redcodefinal> hmm thats neato
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<FromGitter>
<redcodefinal> When making a method that returns nothing, what data type do you use? Nil?
<BlaXpirit>
redcodefinal, yes. though people almost never write that a method returns : Nil
<FromGitter>
<redcodefinal> @BlaXpirit whys that? No need because of crystals inference?
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<BlaXpirit>
redcodefinal, well there's never a need to specify any types in methods. it's all for type safety and documentation
<BlaXpirit>
and i guess people just find it weird to write : Nil
<Papierkorb>
I do it from time to time to make sure to not return anything, else a user might think that the result of that method is intentional and uses it and then their app breaks down the road or so
<Papierkorb>
for private methods I don't care, for some public methods I do care. Though I also tend to write out the (non-nil) return type explicitly if either 1) it's not obvious, so to help the reader 2) the code may be finicky so to make the compiler error out on code changes
<Papierkorb>
*bad code changes
<FromGitter>
<redcodefinal> Yeah I just like being explicit when dealing with types, I agree with @BlaXpirit about the fear of someone changing something down the road and then their stuff no longer works.