Remove macro and use Transformer functions.

[code-shoily]

Oh this is going to be a big one. When I first started this challenge, I was fairly new to Elixir and the file structure for inputs was different. So to save myself some time figuring out the relativity of locations (maybe) I decided to use Macro and include it everywhere.

I recently restructured the input file locations (by moving them to /priv/input_files) and this makes it easier to just use functions. There are 97 modules that use the macro and the task is to replace them with function calls.

As an example:

If we previously had:

use AdventOfCode.Helpers.InputReader, year: 2015, day: 1

def run_1, do: input!() |> floor(0)
def run_2, do: input!() |> to_basement(0, 0)

They will now become:

  alias AdventOfCode.Helpers.InputReader

  def input(), do: InputReader.read_from_file(2015, 1)

  def run(input \\ input()) do
    input = parse(input)
    {run_1(input), run_2(input)}
  end

  def run_1(input), do: ...
  def run_2(input), do: ...
  def parse(input), do: ...

And then on tests, remove individual tests for run_1 and run_2 and make them a single run test. As an example -

THIS

defmodule AdventOfCode.Y2020.Day01Test do
  ...
  test "Year 2020, Day 1, Part 1" do
    assert Solution.run_1() == 1_014_624
  end

  test "Year 2020, Day 1, Part 2" do
    assert Solution.run_2() == 80_072_256
  end
end

SHOULD BECOME THIS

defmodule AdventOfCode.Y2020.Day01Test do
  ...
  test "Year 2020, Day 1" do
    assert Solution.run_1() == {1_014_624, 80_072_256}
  end

Basically, use turns into alias and we add a new @input that is read_from_input(year, day) (which is in the use macro now).

After the change is done, we should ensure it didn't break anything by running mix test --only y151 (15 = 20(15) and 01 = day 01 -- days < 10 are 0 padded ). Thankfully, I had them test cases covered 🤓

In addition, we moved some common functionalities into Transformers module. Like String.split(&1, "\n") became Transformers.lines(). If while changing this, we encounter some of those, then we can change those as well.

I will be opening up PRs that solve fraction of these and add a checkbox in here.

Will add tool to visualize/find them here soon.