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/

George Dietrich

@Blacksmoke16

could call .to_set on it

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@FromIRC

<Sankalp> True

George Dietrich

@Blacksmoke16

https://crystal-lang.org/api/1.4.1/Enumerable.html

Note that most search and filter methods traverse an Enumerable eagerly, producing an Array as the result. For a lazy alternative refer to the Iterator and Iterable modules.

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@FromIRC

<Sankalp> Ahh.. I see.

<Sankalp> Thank you, Blacksmoke16!

Kirill Zvonov

@kzvonov

Hey guys! I've a problem installing Crystal on my M1 Pro Chip inside a docker container. To be precise (1) I have M1 Pro chip (2) I have a container with ruby powered by Debian 11 (3) I'm trying to run this script RUN curl -fsSL https://crystal-lang.org/install.sh | bash

I suppose I can compile it from the source code, but are there any guides about it?

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@FromIRC

<Sankalp> There's a guide on how to install it on a debian system https://crystal-lang.org/install/on_debian/

Kirill Zvonov

@kzvonov

Yep, there's, but it doesn't work for Mac M1 Pro Chip when you are installing crystal in a Docker container

(1) % docker run --rm -it debian bash

(2) apt update && apt install curl

(3) curl -fsSL https://crystal-lang.org/install.sh | bash

(4) crystal -> bash: crystal: command not found

It doesn't work

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@FromIRC

<frojnd> @kzvonov what does the output say after you run curl ... command ?

<frojnd> @kzvanov also add dpkg -l |grep crystal to docker and see the output

Kirill Zvonov

@kzvonov

dpkg -l |grep crystal
ii  crystal1.2-docs                    1.2.2-1+1.103                  all          Documentation for the Crystal Programming Language
ii  crystal1.2-samples                 1.2.2-1+1.103                  all          Sample code for the Crystal Programming Language

@FromIRC frojnd thanks for helping

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@FromIRC

@kzvonov, I'm a bot, bleep, bloop. I relay messages between IRC (#crystal-lang on irc.libera.chat) and here

<frojnd> @kzvanov can you also paste the output of: curl -fsSL https://crystal-lang.org/install.sh | bash

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@FromIRC

<frojnd> Maybe because you are on arm?

Kirill Zvonov

@kzvonov

any suggestions?

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@FromIRC

<frojnd> I know there were some experimenting with arm but more on https://forum.crystal-lang.org https://forum.crystal-lang.org/t/docker-images-for-arm-rpi/1105/6?

Kirill Zvonov

@kzvonov

Thanks!

George Dietrich

@Blacksmoke16

@kzvonov checkout https://packagecloud.io/84codes/crystal

Paul M. Lambert

@plambert

Dumb, quick question: anyone know of a relatively loose date/time string parser that allows a whole lot of common patterns? Like 2022-05-02 06:07:08 and 5/2/2022 6pm and such?

Not looking for anything perfect, just to allow CLI users the chance to use whatever format they try first...

moe

@moe:busyloop.net

[m]

didn't find one when i last looked

shouldn't be too hard to port one of the ruby ones tho, if you're so inclined. e.g. https://github.com/mojombo/chronic

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<wwalker> Looking for an ORM recommendation. I did some looking and ended up at Granite, but it's README starts with "Looking for Maintainers"... I only need the simplest of ORMs, but with sqlite support. I might not even need an ORM.

George Dietrich

@Blacksmoke16

https://crystal-lang.github.io/crystal-db/api/0.11.0/DB/Serializable.html works quite well. You would need to handle insert/updates yourself. But that can be fairly easily abstracted into a method

Ali Naqvi

@naqvis

Dumb, quick question: anyone know of a relatively loose date/time string parser that allows a whole lot of common patterns? Like 2022-05-02 06:07:08 and 5/2/2022 6pm and such?

you can use Time::Format with some extra cleanup to try parse String to Time
https://carc.in/#/r/d4wj

Paul M. Lambert

@plambert

Dumb, quick question: anyone know of a relatively loose date/time string parser that allows a whole lot of common patterns? Like 2022-05-02 06:07:08 and 5/2/2022 6pm and such?

you can use Time::Format with some extra cleanup to try parse String to Time
https://carc.in/#/r/d4wj

Wow, thank you, that's a great start!

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@FromIRC

<wwalker> if I have multiple source files to build a single binary, what does my shard.yml targets section look like?

George Dietrich

@Blacksmoke16

youd prob require all the required files within 1 file and use that as your target in shard.yml

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@FromIRC

<wwalker> Every example I see has main: src/main.cr

George Dietrich

@Blacksmoke16

i.e. you dont specify all your source files as targets

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@FromIRC

<wwalker> @Blacksmoke16: thank you.

George Dietrich

@Blacksmoke16

yea, look in that file and you'll see like:

require "..."
require "..."
...

Paul M. Lambert

@plambert

Can I do string manipulation inside a macro?

For example, the equivalent of "foo".gsub(/o/) {|m| "x"}

George Dietrich

@Blacksmoke16

yes, but depends on what exactly you want to do id say, as it only has a subset of the API

Paul M. Lambert

@plambert

Specifically, I am defining classes, and want to define methods with the class names changed from FooBarBaz to foo_bar_baz

George Dietrich

@Blacksmoke16

{{ pp "foo".gsub /o/, "x" }}

.underscore?

Paul M. Lambert

@plambert

Wow! Thanks. :)

I never thought to search for that. :)

Paul M. Lambert

@plambert

OK, while I'm here, a question I've had for a while…

I'd love to be able to create a macro that defines a class

But also adds it to a list, and later populate a case statement and an enum

I think this is possible, and if it's possible, it's surely been done... so if anyone has an idea where I might find an example to look at and learn from, I'd love to know!

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