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/

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@FromIRC

<linuksz> what's wrong with it? (the last 3 line contains the error, but i don't know what's wrong)

Johannes Müller

@straight-shoota

@linukzs What's the error message?

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@FromIRC

<linuksz> http://sprunge.us/fUHD

Ghost

@ghost~55586c4815522ed4b3e08557

I think you want input: nil in the process creation line

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@FromIRC

<linuksz> input: nil works

<linuksz> but why should it be nil when i want to use it

<linuksz> ?

Ghost

@ghost~55586c4815522ed4b3e08557

it's kinda weird we know (it'll be changed soon), specifying nil will allows you to control the process. Using true will just let the terminal (where you run your program) interact with the process, not your program.. (makes sense?)

From IRC (bridge bot)

@FromIRC

<linuksz> so it always controls the input, but when it's true, i can write text for dmenu from the terminal?

<linuksz> and when it's nil, it can be accessed from the program?

Ghost

@ghost~55586c4815522ed4b3e08557

Exactly

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@FromIRC

<linuksz> can i do the same thing with the output of the program?

<linuksz> i found a code example: https://stackoverflow.com/questions/35484700/how-to-execute-a-shell-script-in-crystal-while-capturing-output#35490899

Ghost

@ghost~55586c4815522ed4b3e08557

It'll be clearer when #4445 is merged

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@FromIRC

<Papierkorb> ... Or just curl http://example.com - Yes, with backticks.

<linuksz> but why do the above example use a memory io

<linuksz> ?

Gabriel Torrecillas Sartori

@G4BB3R

What is the idiomatic way to transform (a | nil) into a ? I mean, giving it a default value if nil

Ghost

@ghost~55586c4815522ed4b3e08557

It depends, how do you assign a ?

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@FromIRC

<Papierkorb> @G4BB3R, a || "some default"

<Papierkorb> Watch out for when used on a Bool?

Hanyuan Li

@hanyuone

Has anyone used libgen?

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@FromIRC

<bmcginty> @Qwerp-Derp: Yes. I couldn't get it to remove common prefixes from things, but that was my only issue.

Hanyuan Li

@hanyuone

Hmmm, what do I put in the "includes" field?

name: LibGTK
ldflags: "-lgtk-3"
packages: "gtk-3"
destdir: src/libgtk
definitions:
  application:
    description: Application
    includes: [ gtk/application.h ]
    prefixes: [ gtk_ ]

Currently I have this, but it doesn't work

bmcginty?

I'm confused as to why this syntax:

a, b : Int32

is available in structs, but not classes

Hanyuan Li

@hanyuone

Hello?

Serdar Dogruyol - Sedo セド

@sdogruyol

hi @Qwerp-Derp

Hanyuan Li

@hanyuone

Hello @sdogruyol!

I'm having problems with libgen, can you help?

Serdar Dogruyol - Sedo セド

@sdogruyol

sorry, I don't have much experience with libgen @Qwerp-Derp

Gabriel Torrecillas Sartori

@G4BB3R

There is no (easy) way to load from DB and it receive a json with correct column names instead of list with values?

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@FromIRC

<RX14> "a json" do you mean a named tuple?

unreadable

@unreadable

you can get the result as a tuple

I made a function that converts that tupple to json

Gabriel Torrecillas Sartori

@G4BB3R

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@FromIRC

<RX14> you want something like this: crystal-lang/crystal-db#56

unreadable

@unreadable

  #converts tuples to json
def to_json(keys : Tuple, values : Tuple) : String
    if keys.size != values.size
      puts "Different tuple sizes!"
      return ""
    end
    json = "{"
    keys.size.times do |i|
      key = "\"" + keys[i] + "\":"
      val = "\"" + values[i] + "\","
      json += (key + val)
    end
    json.rchop + "}"
end

ex: to_json({"name", "email",}tuple)

From IRC (bridge bot)

@FromIRC

<RX14> please please don't do that

<RX14> that's no escaping at all

<RX14> use JSON.build

unreadable

@unreadable

Not sure if needed

Yeah I've used that before

require "json"

string = JSON.build do |json|
  json.object do
    json.field "name", "foo"
    json.field "values" do
      json.array do
        json.number 1
        json.number 2
        json.number 3
      end
    end
  end
end
string # => %<{"name":"foo","values":[1,2,3]}>

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@FromIRC

<RX14> it's always needed

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