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

puts [1, 2, 3, 4, 5].count { |i| i.to_s.matches? /3/ }

or in this specific case puts [1, 2, 3, 4, 5].count 3

Alex Kampa

@alex-kampa

thanks, the ".matches?" looks good, short and idiomatic. I know, RTFD :-)

Thanks @Blacksmoke16

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@FromIRC

<mfiano> Is there a way I can run ameba automatically when I "run" or "spec"?

George Dietrich

@Blacksmoke16

setup a Makefile

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@FromIRC

<mfiano> Fair enough

George Dietrich

@Blacksmoke16

dont think youd want to run it every time you go to run the program tho

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@FromIRC

<mfiano> Probably whenever I spec though

George Dietrich

@Blacksmoke16

yea

Jason Waldrip

@jwaldrip

alright, solved that one... next Q

how is is possible to call .from_json on an abstract class and have it resolve to one of its decendants?

George Dietrich

@Blacksmoke16

https://crystal-lang.org/api/master/JSON/Serializable.html#use_json_discriminator(field,mapping)-macro

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@FromIRC

<mfiano> Ah cool, no Makefile required

George Dietrich

@Blacksmoke16

crystal spec && ./bin/ameba?

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@FromIRC

<mfiano> on save, vim-crystal seems to annotate the margin and with error icons, and when cursor is on one of those lines, message in status bar

George Dietrich

@Blacksmoke16

ah nice, i know sublime runs the formatter on save as wel, is super nice

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@FromIRC

<mfiano> Yeah vim-crystal seems to run the formatter (optionally [disabled by default for some reason]), and ameba if available, though no mention of that or switch for it

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<mfiano> Day 1 actually getting the tooling set up and writing a small amount of code, and I must say, Crystal was easier to get comfortable with than most of the few dozen or so languages I've tried.

George Dietrich

@Blacksmoke16

:thumbsup:

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@FromIRC

<mfiano> development_dependencies are included when not building with --release, right, or is there some other criteria that classifies what "development" means?

George Dietrich

@Blacksmoke16

they're dependencies not used in the final build of the code

i.e. ameba, and testing stuff

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@FromIRC

<mfiano> Right, I'm looking at debug.cr right now...they say you can call Debug.enabled = true if you don't want to set an env var, so I'm wondering if I can check some flag as to not call that in release builds

George Dietrich

@Blacksmoke16

{% unless flag? :release %}
  Debug.enabled = true
{% end %}

would be true whenever its built without --release

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@FromIRC

<mfiano> You mean the inverse ;⁠)

<mfiano> But, thanks

George Dietrich

@Blacksmoke16

i mean Debug.enabled would be true w/o --release

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@FromIRC

<mfiano> Oh yes you're right, I read your description wrong.

<mfiano> It might be about time for bed :⁠/

George Dietrich

@Blacksmoke16

but to answer your earlier question doing like shards build --release would also technically install dev dependencies, but is likely you're not requiring those in your main code anyway.

would want to use --production or --without-development, can do shards --help for more info

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<mfiano> Where is a good place to put such meta-code as the above?

George Dietrich

@Blacksmoke16

would need to go in your main entrypoint file, or some other file that requires it

oh i have an idea

have a debug.cr file that you put this stuff in

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@FromIRC

<mfiano> Does it matter that it's before the main entry point's "require"s?

George Dietrich

@Blacksmoke16

then you can add a {% skip_file if flag?(:release) %} so that the code isn't processed in release mode

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@FromIRC

<mfiano> Oh hmm...and where would that macro form go?

George Dietrich

@Blacksmoke16

first line of debug.cr

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@FromIRC

<mfiano> Aha!

George Dietrich

@Blacksmoke16

https://crystal-lang.org/api/master/Crystal/Macros.html#skip_file:Nop-instance-method

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@FromIRC

<mfiano> I like that better. It probably means I have to explicitly require debug.cr before other requires for this to work properly, rather than an arbitrary *...or I could be wrong

George Dietrich

@Blacksmoke16

i would advise against using like require "./**"

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@FromIRC

<mfiano> Yeah I would too

<mfiano> Though I must be doing something wrong here.

<mfiano> https://gist.github.com/fc1cd170def70e6ca81b3cbfab61b3ad

<mfiano> i did shards install, but get undefined constant Debug

George Dietrich

@Blacksmoke16

oh well you need to require the lib

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