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/

Weston

@wwselleck

i tried making that "my" language, but just coudlnt

Kent 'picat' Gruber

@picatz

I've done some weird stuff like doing go bindings to ruby.

Weston

@wwselleck

its just tooo bare bones. Just to make a data type sortable takes like 50 lines.

Kent 'picat' Gruber

@picatz

I think Crystal does everything go does better ( in my opinionated opinon )

Feel free to make issues or whatever as you find them and we can address them on github / put that shiz into version control

Even if you have questions for how something works.

That way, if someone else had a similar question, at least it'd be documented.

Weston

@wwselleck

So like this: https://github.com/picatz/command_lion/blob/master/examples/read_file.rb

This would be triggered using ./myprogram --read

Kent 'picat' Gruber

@picatz

it'd be $ruby app.rb --read file.txt

for that one

( I'm dumb sometimes, sorry :smile: )

I'd like to add :file type I'd think

That way I can have a nice little wrapper for when users are working with files perhaps.

It'd be an opt-in thing, where they could just use :string and then open the file.

But, I'd like for a :file type to have some sort of builtin helper method to abort if the file doesn't exist or something maybe.

Weston

@wwselleck

command :hello do
  flag "hello"

is the flag redudant there

Kent 'picat' Gruber

@picatz

The flag would probably be redundant there, yeah.

Don't forget the end of course ;)

The command :index is used to basically be able to reference the command object elsewhere in the app.

commands and options ( which are direct subclasses of commands ) are indexed in hashes basically.

the index ( key ) being the :index symbol you give it.

The index is also used as the default flag if not specified otherwise.

I've sort of recently adopted that.

But, I'm cool with it. I think it makes things simpler without adding too much complexity. I think.

In practice there wouldn't be a big problem being redundant if people didn't know and always set the flag

I almost never use the flags block in my examples

There you can explicitly set short and long flag types.

I gotta go do some stuff, but I'll be back later :v:

Weston

@wwselleck

l8r

Weston

@wwselleck

oh boy this whole block/yield stuff is going to take some practice.

it seems similar to nodeish callbacks on the surface, but they're used very differently it seems

Kent 'picat' Gruber

@picatz

It's not too bad, but takes some getting used to: https://gist.github.com/picatz/7f280bea5b8cf05491df95fbb445d78c

You can do some nifty things with blocks.

Best thing to do is load up crystal play and play around with stuff.

For really small examples.

Stephan Langeveld

@Fanna1119

whats the difference between block one and 2 ?

1.upto(100) do |x|
    puts x
end

1.upto(100) {|x| puts x}

Kent 'picat' Gruber

@picatz

Basically a do can be a { and a end can be a }.

So, my understanding is, basically nothing.

Stephan Langeveld

@Fanna1119

@picatz ahh thank you :), coming from a non ruby background. i am still in the phase where i don't what works and what doesn't as well as not sure what is the "right" way of doing some things just yet haha

Kent 'picat' Gruber

@picatz

No worries :+1:

I don't mind helping out, at least as much as I can :joy:

cevarief

@cevarief

Is it possible to call a class without instantiating but still keep overloading?

cevarief

@cevarief

yes possible

But it should be all using self. Can self call non self method?

Rubi

@codenoid

btw, how to activate this > https://github.com/rhysd/vim-crystal#completion

Rubi

@codenoid

nice, i use super tab

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