jhass changed the topic of #crystal-lang to: The Crystal programming language | http://crystal-lang.org | Crystal 0.18.7 | Fund Crystals development: http://is.gd/X7PRtI | Paste > 3 lines of text to https://gist.github.com | GH: https://github.com/crystal-lang/crystal | Docs: http://crystal-lang.org/docs/ | API: http://crystal-lang.org/api/ | Logs: http://irclog.whitequark.org/crystal-lang
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<FromGitter> <sdogruyol> BlaXpirit cool one
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<RX14> i should make a ROM/datamapper sort of thing in crystal
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<FromGitter> <sdogruyol> @RxX14 that would be great
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<RX14> i like the idea of the "orm" just handling converting between tuples from the database driver, and custom objects
<RX14> and possible providing coem macros to create model objects
<RX14> i think querying should be done through SQL, because thats what it's designed for
<RX14> but then ROM is cool because it's not sql limited, and can map from http and other things, which makes it more complicated.
<RX14> designing things is hard :)
<FromGitter> <kofno> Go has `range`, which lets you iterate over a channel until the it's empty and closed. (https://gobyexample.com/range-over-channels). Is there something similar for Channels in crystal?
<RX14> well,
<RX14> you can do `while item = channel.recieve?`
<RX14> receive?*
<RX14> which is short enough
<FromGitter> <kofno> ahh... ok. Thanks!
<RX14> if you use an unbuffered channel you need 2 fibers though
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<FromGitter> <kofno> I don't know go, but I think that example uses a buffered channel.
<RX14> i think so too
<RX14> because of the 2
<FromGitter> <sdogruyol> yeah that's a buffered channel
<FromGitter> <sdogruyol> oh god, Go looks so archaic :(
<BlaXpirit> well just add a fiber, not to add the scary requirement of a buffered channel https://carc.in/#/r/14wi
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<RX14> its hardly scary
<FromGitter> <sdogruyol> it's not scary
<BlaXpirit> an arbitrarily picked size limit is always scary
<RX14> not in an example
<FromGitter> <sdogruyol> haha
<RX14> not if you explain it
<FromGitter> <sdogruyol> uhmm, is there a way to check if a method is inlined or not?
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<RX14> @sdogruyol, why do you need it?
<FromGitter> <sdogruyol> curiousity it is :P
<FromGitter> <sdogruyol> and also for profit hehe
<FromGitter> <kofno> Thanks everyone. My goal was just to get more comfortable using Channels and Fibers, so I've been looking at Go for examples and seeing how they translate to Crystal. Mission accomplished :)
<FromGitter> <sdogruyol> @kofno good job!
<FromGitter> <kofno> Thanks!
<RX14> i know I can see when methods are inlined when i profile crystal
<RX14> kinda
<RX14> but i'm not sure how to just dump the whole thing
<FromGitter> <sdogruyol> have you checked this repo it has great samples https://github.com/askn/crystal-by-example
<RX14> plus, nearly everything is inlined when used only once
<FromGitter> <sdogruyol> @kofno my friend also wanted to compare the go versions to crystal so he created this repo
<FromGitter> <sdogruyol> RX14: how about blocks
<FromGitter> <sdogruyol> or any callable
<RX14> blocks are always inlined
<FromGitter> <sdogruyol> now, that's cool
<RX14> yield literally pastes the block contents
<RX14> and inlines the containing method
<RX14> its just how they are implemented
<FromGitter> <sdogruyol> is it the same for Proc e.g?
<RX14> hence 3.times generates the same code as a while loop when desugared
<RX14> uhh, i don't think proc is the same
<RX14> well it can't be
<FromGitter> <sdogruyol> yeah
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<FromGitter> <kofno> @sdogruyol That's cool. Part of this is a learning exercise for me. I want to see if I can translate these patterns myself, so I can understand them. That will make it easier for me to put them together later when I need to build something with it.
<FromGitter> <sdogruyol> @kofno cool
<FromGitter> <sdogruyol> i mean what if a Proc is generated but never used later?
<FromGitter> <sdogruyol> does it even baked into the result or get rid of
<RX14> if llvm can prove the variable is never used then it probably discards it like any other variable
<RX14> proc is just a function pointer i think
<FromGitter> <sdogruyol> yeah, probably but Proc is pretty tricky
<FromGitter> <sdogruyol> dunno about LLVM representation though
<RX14> the pointer and closure data are Void* though so they must be compiler details
<FromGitter> <sdogruyol> LLVM is pretty damn neat
<FromGitter> <sdogruyol> i have to study it sometime
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<djdarkbeat_> Hoping for a good pointer. Found something on google saturday didn’t know what it was at the time but now cant’ find the search result again.
<FromGitter> <sdogruyol> what's it?
<djdarkbeat_> I thought I saw something where you could write the format of the slices you wanted
<djdarkbeat_> (Int16,Int16, Int32,Int32,Int32,Int32,Int32,Int32)
<djdarkbeat_> then get it from IO
<RX14> i think tuple.from_io is a thing
<djdarkbeat_> but I seem to be stuck on pulling each byte group off IO
<djdarkbeat_> tuple.from_io
<djdarkbeat_> that could be good.
<RX14> actually no
<RX14> doesn't seem to be
<RX14> that would be useful
<djdarkbeat_> I have packets that are packed from multiple integer and string components, mixed endianness from different manufacturer hardware, including bitpacked elements that are boolean
<djdarkbeat_> wrote this once in Ruby 3 years ago and it’s SLOW, would love to speed it up.
<RX14> {Int16, Int32, UInt8}.from_io(io, IO::ByteFormat::LittleEndian)
<djdarkbeat_> I can swear I saw something where you could pass Slice some grammar.
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<djdarkbeat_> oooh @RX14
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<RX14> djdarkbeat_, ?
<djdarkbeat_> testing that now.
<RX14> i made it up
<RX14> it was an example of what should work
<djdarkbeat_> ouch
<RX14> >> {Int32, UInt8}
<DeBot> RX14: # => {Int32, UInt8} - https://carc.in/#/r/14wm
<RX14> >> typeof({Int32, UInt8})
<DeBot> RX14: # => Tuple(Int32:Class, UInt8:Class) - https://carc.in/#/r/14wn
<djdarkbeat_> well i’m on the right track
<djdarkbeat_> looked through the messagepack library for crystal
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<djdarkbeat_> is 17.4 the latest on homebrew?
<FromGitter> <sdogruyol> nope
<FromGitter> <sdogruyol> should be 0.18.7
<djdarkbeat_> just ran into that issue
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<FromGitter> <kofno> hrm... just noticed that carc.in doesn't work on chrome.
<FromGitter> <sdogruyol> really?
<FromGitter> <sdogruyol> I'm always using Chrome
<FromGitter> <kofno> hrm... really. Maybe it's my chrome. I usually use Opera. It works there and on firefox, but not chrome.
<FromGitter> <kofno> I get bad gateway errors when I try to run code.
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<FromGitter> <asterite> @kofno Note that concurrency patterns are missing in Crystal because that whole part isn't finished yet. Channel should probably have an `each` method so you can iterate it. That would be the equivalent of Go's `for ... range channel`
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<FromGitter> <sdogruyol> @asterite are you working on parallelism atm, is it the first priority?
<FromGitter> <kofno> @asterite Thank you. I know crystal is still WIP, but I'm pretty excited about it, so I'm playing w/ now :)
<FromGitter> <DougEverly> relatedly, is there a `channel.receive(timeout)`?
<FromGitter> <asterite> @sdogruyol I'm actually cleaning up the compiler's code. There are many places where code could be improved. My idea is that it should be really easy to understand and contribute to. So that's one my priorities right now. It might seem like a slowdown but in the long run it will make us (and everyone) go faster
<FromGitter> <asterite> @DougEverly https://github.com/crystal-lang/crystal/issues/2990
<FromGitter> <sdogruyol> @asterite yeah, i definitely agree with you
<FromGitter> <sdogruyol> imho, we should have a little guide to jump into Crystal compiler development itself :P
<FromGitter> <asterite> djdarkbeat_ seem to be gone, but the method he was needing was IO#read_bytes; https://crystal-lang.org/api/0.18.7/IO.html#read_bytes%28type%2Cformat%3AIO%3A%3AByteFormat%3D%3Cspanclass%3D%22t%22%3EIO%3C%2Fspan%3E%3Cspanclass%3D%22t%22%3E%3A%3A%3C%2Fspan%3E%3Cspanclass%3D%22t%22%3EByteFormat%3C%2Fspan%3E%3Cspanclass%3D%22t%22%3E%3A%3A%3C%2Fspan%3E%3Cspanclass%3D%22t%22%3ESystemEndian%3C%2Fspan%3E%29-instance-method
<FromGitter> <sdogruyol> will make it much more easier to contribute
<djdarkbeat_> @asterite I’m using read_bytes
<FromGitter> <asterite> @sdogruyol I'm slowly cleaning up things and documenting how things work. I think the compiler's logic is very simple. It's just a regular program. Most of the hard parts are done by LLVM
<FromGitter> <asterite> Oh, great! :)
<FromGitter> <sdogruyol> @asterite yeah, it's great and simple for a compiler, but i think i'm not that smart enough to grok it at once
<FromGitter> <sdogruyol> :D
<FromGitter> <sdogruyol> i start reading the compiler source and i find myself somewhere i don't even know haha
<FromGitter> <asterite> Yes, but that's because there are many messy parts and its not documented
<FromGitter> <asterite> I truly believe a compiler is a simple thing. It's just about processing syntax trees
<FromGitter> <sdogruyol> yeah, but the thing is that you're biased because you've been developing a compiler for more than 3 years, right? :P
<djdarkbeat_> I’m doing this
<djdarkbeat_> but I have a grammer to implement that has about 180 elements.
<FromGitter> <asterite> @sdogruyol yes, I was going to say the same :blush:
<FromGitter> <sdogruyol> :D :+1:
<djdarkbeat_> I would like to specify the grammar
<djdarkbeat_> Tuple(Int16,Int16, Int32,Int32,Int32,Int32,Int32,Int32)
<FromGitter> <asterite> We could probably add that, sounds useful
<FromGitter> <asterite> But, mmm...
<FromGitter> <asterite> what do you do with those version, type, sequence, etc.?
<FromGitter> <DougEverly> ok https://github.com/crystal-lang/crystal/issues/2990 is closed.. looks like Crystal is preferring roll-your-own recv or timeout
<FromGitter> <asterite> Maybe it's better to read the whole chunk of bytes at once and map them to a struct of some sort
<FromGitter> <sdogruyol> isn't that inefficient?
<FromGitter> <asterite> @DougEverly not exactly, we plan to have a select expression similar to Go, where in one branch you could specify a timeout
<FromGitter> <asterite> Oh, but there's the endianess... mmm... I guess it needs to be done field by field
<djdarkbeat_> I guess it would,
<FromGitter> <asterite> it can probably be simplified with macros
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<djdarkbeat_> I swear on Saturday I googled something where I found a result someone had working where they were initializing a slice off a struct like this Int16,Int16, Int32,Int32,Int32,Int32,Int32,Int32
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<djdarkbeat_> from IO
<djdarkbeat_> but I can’t find it and browser history is letting me down, starting to wonder if I imagined it.
<FromGitter> <sdogruyol> are you talking about record?
<RX14> i don't think so
<RX14> i'm pretty sure record doesn't have that method
<RX14> nop
<FromGitter> <DougEverly> looking forward to it @asterite ... also I know that current Crystal has mutex and condition variable private. Are these going to be public with the new concurrency model? There are cases where global state structures may need to be modified and synchronized and these come in handy. Go even has these in the `sync` package despite favoring channels in most cases.
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<FromGitter> <asterite> @DougEverly Mutex is now fiber-mutex, the old thread-mutex is now Thread::Mutex, so you can use that right away. We are still missing fiber-condition-variable, though
<RX14> i wish vim-crystal was faster
<RX14> on complex files it just kills the cpu
<RX14> stupid regex
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<FromGitter> <DougEverly> :thumbsup: thanks @asterite
<djdarkbeat_> seems to be getting somewhere with this:
<djdarkbeat_> {Int16,Int16, Int32}.map {|fad| fad.from_io(io, IO::ByteFormat::LittleEndian)}
<djdarkbeat_> I can grab the chunks that are the same endianness
<djdarkbeat_> but different sizes
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<RX14> maybe there should be an IO.mapping
<RX14> which defnes how to read an object from IO
<RX14> endianness for each field
<RX14> order
<RX14> etc.
<RX14> maybe even padding
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<djdarkbeat_> If I set this up
<djdarkbeat_> Hash{:version => Int16, :message_type => Int16, :sequeunce_number => Int32}
<djdarkbeat_> I can get the symbols with .keys
<djdarkbeat_> and the values with .values
<djdarkbeat_> but I when I iterate it.
<djdarkbeat_> I can’t grab the key or the value to assign what I’m plucking off IO
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<djdarkbeat_> Error in ./hello.cr:12: instantiating 'Hash(Symbol, Int16:Class | Int32:Class)#each()'
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<djdarkbeat_> This is how I am doing it for now until I find a better way
<djdarkbeat_> it works
<djdarkbeat_> version, message_type, sequence_number = {Int16,Int16, Int32}.map {|bytes| bytes.from_io(io, IO::ByteFormat::LittleEndian)}
<djdarkbeat_> with the parallel assignment.
<FromGitter> <sdogruyol> wow, cool
<FromGitter> <sdogruyol> good job
<djdarkbeat_> Hash.keys and Hask.values work
<djdarkbeat_> but within the iteration of a Hash
<djdarkbeat_> element.key and element.value does not
<djdarkbeat_> So using this as a constuct
<djdarkbeat_> Hash{:version => Int16, :message_type => Int16, :sequeunce_number => Int32}
<djdarkbeat_> does not work
<RX14> djdarkbeat_, what are you asking about iterating hashes?
<djdarkbeat_> inside the each block I can’t get the individual key or value
<RX14> djdarkbeat_, https://carc.in/#/r/14wz
<RX14> hash iteration is weird
<djdarkbeat_> Derp @rx14
<RX14> i wish crystal didn't perfom it's magic
<RX14> it's confusing that yielding a tuple expands to the block arguments
<RX14> people should be force to use each do |{key, value}| to avoid special casing
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<asterite> what's the problem? :-)
<RX14> it's just weird and obscure
<RX14> and confusing
<FromGitter> <jmoriau> @djdarkbeat_ did/could you try with a NamedTuple instead of a Hash something like {version: String, message: Int} (notice the : not =>)
<RX14> special casing yielding a tuple into expanding block args is ugly and i hate it
<djdarkbeat_> no because the packing of the packet is proprietary, mices several vendor hardware, endianness, bitstrings, UTF8 all in one. I have to be very eplicit about each element I’m grabbing.
<RX14> djdarkbeat_, then why do you want to use Hash, it has the same limitations
<FromGitter> <jmoriau> I meant using this {version: Int16, message_type: Int16, sequeunce_number: Int32} instead of {:version => Int16, :message_type => Int16, :⁠sequeunce_number => Int32}
<FromGitter> <jmoriau> @djdarkbeat_
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<FromGitter> <jmoriau> -+
<djdarkbeat_> I am not up on the distinctions of the Tuple in crystal versus the hash short syntax from Ruby.
<FromGitter> <jmoriau> @djdarkbeat_ try it, should work
<djdarkbeat_> is it correct there is no hash short syntax in Crystal?
<djdarkbeat_> that it is a named tuple instead?
<FromGitter> <jmoriau> {version: Int16, message_type: Int16, sequeunce_number: Int32} this is a NamedTuple
<FromGitter> <jmoriau> {:version => Int16, :message_type => Int16, :⁠sequeunce_number => Int32} this is a Hash
<RX14> a StaticTuple can be thought of an immutable hash
<RX14> you should be able to use a StaticTuple instead of a Hash in your usecase
<RX14> and be faster
<RX14> and cleaner imo
<djdarkbeat_> Hmm. I have a component of my bytes for the instrument readings that makes the packet dynamic in length but I see your point. I can use the static tuple for everythign except the readings segment.
<asterite> what's a hash short syntax?
<djdarkbeat_> {this: 2, that: 4}
<FromGitter> <jmoriau> the ':' notation instead of the arrow
<djdarkbeat_> the Ruby 1.8 to 1.9 leap
<asterite> oh, we use that for NamedTuple
<djdarkbeat_> right
<djdarkbeat_> and that’s what threw me a bit
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<RX14> but for your usecase f using it as something to map on to unpack an IO you can use a NamedTuple and it should be the same
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<asterite> depending on what you need the data for, I would use structs with fields, or records. Hashes are (ab)used in Ruby, and in Crystal you can't easily abuse them
<asterite> or just plain variables
<asterite> (but that's just my opinion)
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<FromGitter> <acterhd> Hello have you atomics and simd support?
<djdarkbeat_> what’s the deal with initializing Hash
<djdarkbeat_> of Int32 => Int32
<djdarkbeat_> can you mix types?
<RX14> djdarkbeat_, can you give an example
<RX14> acterhd, no, not really
<RX14> we don't have intrinsics
<djdarkbeat_> I have this
<djdarkbeat_> {version: Int16, message_type: Int16, sequence_number: Int32}
<djdarkbeat_> I am iterating over it.
<RX14> yes, exactly the same as hash
<djdarkbeat_> hash[key] = value.from_io(io, IO::ByteFormat::LittleEndian)
<djdarkbeat_> would like a hash of my output
<RX14> why not create a named tuple
<RX14> hash is wrong here
<RX14> i would create a normal tuple myself
<djdarkbeat_> {version:1,message_type:4,sequence_number:952}
<djdarkbeat_> in Ruby I would do this with inject
<FromGitter> <acterhd> i.e. you have no parallelism?
<djdarkbeat_> but I sense the thinking is a bit different in crystal
<RX14> acterhd, nope not yet, but we will before 1.0
<RX14> djdarkbeat_, yes because the compiler has to know whaat you're doing
<RX14> you might need to use macros here i'm not sure
<RX14> but using a hash is wrong here
<FromGitter> <acterhd> how you made IRC in gitter?
<RX14> custom bot written in crystal
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<RX14> acterhd, btw parallelism isn't so important in crystal because it's just so fast
<FromGitter> <acterhd> I want in crystal write path tracer
<RX14> well
<FromGitter> <acterhd> so need more threads
<djdarkbeat_> So make my output a named tuple
<RX14> you can write it now and it'll be parallel in a few months...
<RX14> djdarkbeat_, yes
<FromGitter> <acterhd> and will SIMD support?
<FromGitter> <acterhd> for JS it have
<RX14> i think it's kinda possible
<RX14> you could write it yourself using the asm literal
<RX14> or bind to llvm intrinsics maybe
<FromGitter> <acterhd> Can Crystal builded to webassembly?
<RX14> no
<RX14> technically yes
<RX14> but not
<RX14> not without a large amount of effort
<FromGitter> <acterhd> what is bigint?
<djdarkbeat_> well I’m going to have to keep my eye on this for sure, we’re aggregating live transit data from UDP streams. Rubys not going to keep up.
<RX14> libgmp arbitrary size integer acterhd
<RX14> djdarkbeat_, crystal might be 100x faster for that already due to evented io
<RX14> even without parallelism
<RX14> on IO bound, bit fiddling workflows crystal can be much much much faster
<djdarkbeat_> That’s great news.
<RX14> libevent + fibers makes any IO much faster on crystal than ruby
<RX14> well, concurrent IO
<RX14> if you perform any blocking IO when processing the udp packet it can start processing another udp packet while the first operation blocks#
<RX14> thats's more useful on tcp
<RX14> but probably still useful on udp
<FromGitter> <acterhd> i want write path tracing for create new image format, different than all in the world
<FromGitter> <acterhd> .dotx
<FromGitter> <acterhd> would be good if will opengl
<asterite> djdarkbeat_: out of curiosity, what protocol do you need to handle?
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<djdarkbeat_> I’m handling UDP packets with a proprietary structure of mixed type data of GPS strings, bitpacked sensor values and numerical instrument readings.
<djdarkbeat_> asterite I’m handling UDP packets with a proprietary structure of mixed type data of GPS strings, bitpacked sensor values and numerical instrument readings.
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<RX14> djdarkbeat_, what do you do with the data? write it to a DB?
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<asterite> djdarkbeat_: sounds super fun!
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<FromGitter> <jwoertink> Anyone here familiar with `guard`?
<FromGitter> <jwoertink> I'm trying to use it with kemal to auto-restart the server when one of the files change, but when it tried to reboot, I get a `Error binding TCP server at 0.0.0.0:3000: Address already in use (Errno)` error
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<FromGitter> <sdogruyol> Ugh, you have to stop the process first
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<FromGitter> <jwoertink> I've never really used guard before, but I'm using `guard-process`
<FromGitter> <jwoertink> and have my `Guardfile` setup with `guard 'process', name: 'crystal app.cr', stop_signal: 'KILL', command: 'crystal app.cr'`
<FromGitter> <sdogruyol> And sleep 0.1 or something to make sure it stops
<FromGitter> <sdogruyol> I have to try it myself but i am going to sleep for now.
<FromGitter> <jwoertink> sleep 0.1?
<FromGitter> <jwoertink> lol
<FromGitter> <sdogruyol> Haha
<FromGitter> <sdogruyol> Nice one :+1:
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<FromGitter> <acterhd> why no float like 1.0f?
<BlaXpirit> acterhd, what's that supposed to do if 1.0 is already a float?
<FromGitter> <jwoertink> `1.0.class #=> Float64`
<FromGitter> <acterhd> 1.0f.class can be float32
<FromGitter> <jmoriau> I thought float literals were always Float64 ?
<FromGitter> <acterhd> also, will cool if crystal can be played in browser
<FromGitter> <acterhd> and will language instead of js
<FromGitter> <jwoertink> Use Opal if you want the syntax
<FromGitter> <acterhd> and types...
<FromGitter> <jwoertink> http://opalrb.org/
<FromGitter> <acterhd> js also have some type restrictions
<FromGitter> <acterhd> for example 1.0 means float
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<crystal-gh> [crystal] asterite pushed 3 new commits to master: https://git.io/vKbdG
<crystal-gh> crystal/master 64fb781 Ary Borenszweig: Make `Slice(T)[...]` coerce the numbers to T if T is a number type. Fixes #3055
<crystal-gh> crystal/master 28205fa Ary Borenszweig: Use `Bytes[...]` instead of `UInt8.slice(...)` (a bit shorter and more clear)
<crystal-gh> crystal/master 69d731b Ary Borenszweig: Compiler: refactors
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