crystal-lang/crystal

The Crystal programming language | http://crystal-lang.org | Fund Crystal's development: http://is.gd/X7PRtI | Docs: http://crystal-lang.org/docs/ | API: http://crystal-lang.org/api/

Elias Perez

@eliasjpr

maybe this is why https://carc.in/#/r/2sv9

Cris Ward

@crisward

Just open sourced this - https://github.com/crisward/mailer

Ary Borenszweig

@asterite

When you don't use a constant it's not typed, so a constant can be used as a placeholder in macros

That is, when you don't use that constant at runtime

Also known has hack #123 (just kidding)

But Elixir does something similar, only with attributes (which only exist at compile-time, I think)

Kingsley Lewis

@vonKingsley

is there a way to tell crystal to always use some link-flags, so i don't forget to pass --link-flags -I/usr/local/opt/openssl/include --link-flags -L/usr/local/opt/openssl/lib each time

José Rodrigues

@joselfr

@vonKingsley I don't know if you can configure crystal for that but you can do a shell alias. Or better a makefile.

Kingsley Lewis

@vonKingsley

thanks @jose-rodrigues i think ill add it to a shell alias

Claudio Holanda

@kazzkiq

@crisward Awesome! Will take a look at it tonight. Thanks!

Ary Borenszweig

@asterite

You can use @[Link] on LibC

Cris Ward

@crisward

@kazzkiq raise an issue if you have any problems. Took me a while to originally get the apis working ok, but pretty sure everything is there now, except the stuff mentioned in the Readme.

From IRC (bridge bot)

@FromIRC

<oprypin> @vonKingsley, have u tried {LD_,}LIBRARY_PATH=/usr/local/opt/openssl/lib crystal run blah

<oprypin> in which case, export {LD_,}LIBRARY_PATH=/usr/local/opt/openssl/lib in your shell and proceed normally

Kingsley Lewis

@vonKingsley

@oprypin I originally just tried LIBRARY_PATH=/usr/local/opt/openssl/lib crystal run which didn't work for me

From IRC (bridge bot)

@FromIRC

<oprypin> LIBRARY_PATH is for build LD_LIBRARY_PATH is for execution. so have u tried both?

Kingsley Lewis

@vonKingsley

@oprypin just tried it and it still didn't work for me, still links to openssl 0.9.8

From IRC (bridge bot)

@FromIRC

<oprypin> @vonKingsley, how are you checking that? it does not link to any particular openssl

<oprypin> you must use LD_LIBRARY_PATH when running the resulting binary

<oprypin> that's when the override happens

Kingsley Lewis

@vonKingsley

i was checking two ways 1 with otool -L on the binary. and the other was running a wireshark and checking if it was using tls 1.2, trying to troublshoot an tls issue

From IRC (bridge bot)

@FromIRC

<oprypin> ok but did u start those with LD_LIBRARY_PATH

Kingsley Lewis

@vonKingsley

Yeah I tried LD_LIBRARY_PATH=/usr/local/opt/openssl/lib crystal run tls_test.cr and it was still using, TLS V1. no worries on it. i got to run but i'll figure something out.

Faustino Aguilar

@faustinoaq

I know you should use LIBRARY_PATH at compile time and LD_LIBRARY_PATH at run time. so:

$ LIBRARY_PATH=/my/lib/path crystal build myprogram.cr
$ LD_LIBRARY_PATH=/my/lib/path ./myprogram

<oprypin> LIBRARY_PATH is for build LD_LIBRARY_PATH is for execution. so have u tried both?

I just see it :sweat_smile:

Faustino Aguilar

@faustinoaq

Does Crystal have something like Intersection Types ? [0]

[0] - https://flow.org/en/docs/types/intersections/

Ghost

@ghost~55586c4815522ed4b3e08557

@faustinoaq I don't get it, what's the difference with our unions?

Faustino Aguilar

@faustinoaq

I'm a bit confused, because I think unions behave differently [0]

[0] - https://flow.org/en/docs/types/unions/

Maybe it's not valid to compare Flow & Crystal :sweat_smile:

Ghost

@ghost~55586c4815522ed4b3e08557

From the given examples, I don't think intersection type is relevant in Crystal

ezrast

@ezrast

You might want to require that an object's class includes two different modules

Ghost

@ghost~55586c4815522ed4b3e08557

oh right

ezrast

@ezrast

I don't know what a real use case would look like though

Ghost

@ghost~55586c4815522ed4b3e08557

no idea too

From IRC (bridge bot)

@FromIRC

<oprypin> @faustinoaq, what's your use case?

Martin Verzilli

@mverzilli

when you're augmenting JS with Flow it makes sense because then you can annotate a param as "whatever you send here should have an attribute X and an attribute Y"

Ghost

@ghost~55586c4815522ed4b3e08557

pinging @asterite will maybe bring a little light here

yes @mverzilli that's what I was thinking too

Martin Verzilli

@mverzilli

in JS it's common to use ad-hoc objects to sort of gimmick named arguments, for example

Flow is a huge attempt at reverse engineering common patterns of use in JS and type-check them

well "reverse engineering" is a very poor choice of terminology :P, it'd be more "capturing"

Nick Clifford

@nickbclifford

can someone help explain the usage of fun outside of a lib declaration to me?

I've seen it used in some issues as a way to mess with the definition of main

but I don't fully understand how that works

Rubi

@codenoid

finally, crystal and @ysbaddaden selenium used in my office <3

Isaac Sloan

@elorest

Is there such a thing as a private macro?

Faustino Aguilar

@faustinoaq

<oprypin> what's your use case?

None, I was reading flow documentation, and then I ask me if there is something similar on Crystal, but the @mverzilli answer solved my question. :+1:

can someone help explain the usage of fun outside of a lib declaration to me?

I think the fun usage outside libs is very limited, fun doesn't support overloading and only support basic types, I think it is more like a C function, thinking on shared libraries or similar stuff.

By example an use case is Writing a dynamic library in Crystal, and calling it from C

Faustino Aguilar

@faustinoaq

@nickbclifford :point_up_2:

Pawan Dubey

@pawandubey

@bew Sorry for the late reply. Yes I saw your wiki - pretty good. I didn't do so much research. I knew that I wanted to parse PEGs, and I liked the DSL of Parslet. I looked at D's Pegged, Clojure's Instaparse, Haskell's Earley and a couple from Go. Although I didn't spend much time ruminating and went to implementation.

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