Add metadata to 2015/1-13

lib/2015/day_01.ex

@@ -2,6 +2,8 @@ defmodule AdventOfCode.Y2015.Day01 do
   @moduledoc """
   --- Day 1: Not Quite Lisp ---
   Problem Link: https://adventofcode.com/2015/day/1
+  Difficulty: xs
+  Tags: sequential
   """
   alias AdventOfCode.Helpers.InputReader
 

lib/2015/day_02.ex

@@ -2,6 +2,8 @@ defmodule AdventOfCode.Y2015.Day02 do
   @moduledoc """
   --- Day 2: I Was Told There Would Be No Math ---
   Problem Link: https://adventofcode.com/2015/day/2
+  Difficulty: xs
+  Tags: geometry2D
   """
   alias AdventOfCode.Helpers.{InputReader, Transformers}
 

lib/2015/day_03.ex

@@ -2,6 +2,8 @@ defmodule AdventOfCode.Y2015.Day03 do
   @moduledoc """
   --- Day 3: Perfectly Spherical Houses in a Vacuum ---
   Problem Link: https://adventofcode.com/2015/day/3
+  Difficulty: xs
+  Tags: grid-walk set
   """
   alias AdventOfCode.Helpers.InputReader
 

lib/2015/day_04.ex

@@ -2,6 +2,8 @@ defmodule AdventOfCode.Y2015.Day04 do
   @moduledoc """
   --- Day 4: The Ideal Stocking Stuffer ---
   Problem Link: https://adventofcode.com/2015/day/4
+  Difficulty: s
+  Tags: md5 annoying
   """
   def run_1, do: lowest_number("bgvyzdsv", 1)
   def run_2, do: "bgvyzdsv" |> lowest_number_2(1)

lib/2015/day_05.ex

@@ -2,6 +2,8 @@ defmodule AdventOfCode.Y2015.Day05 do
   @moduledoc """
   --- Day 5: Doesn't He Have Intern-Elves For This? ---
   Problem Link: https://adventofcode.com/2015/day/5
+  Difficulty: xs
+  Tags: string
   """
   alias AdventOfCode.Helpers.{InputReader, Transformers}
 

lib/2015/day_06.ex

@@ -2,7 +2,8 @@ defmodule AdventOfCode.Y2015.Day06 do
   @moduledoc """
   --- Day 6: Probably a Fire Hazard ---
   Problem Link: https://adventofcode.com/2015/day/6
-  NOTE: This is slow!
+  Difficulty: m
+  Tags: grid vector reduction slow
   """
   alias Aja.Vector
   alias AdventOfCode.Helpers.{InputReader, Transformers}

lib/2015/day_08.ex

@@ -2,6 +2,8 @@ defmodule AdventOfCode.Y2015.Day08 do
   @moduledoc """
   --- Day 8: Matchsticks ---
   Problem Link: https://adventofcode.com/2015/day/8
+  Difficulty: m
+  Tags: string-encoding annoying
   """
   alias AdventOfCode.Helpers.{InputReader, Transformers}
 

lib/2015/day_09.ex

@@ -2,6 +2,8 @@ defmodule AdventOfCode.Y2015.Day09 do
   @moduledoc """
   --- Day 9: All in a Single Night ---
   Problem Link: https://adventofcode.com/2015/day/9
+  Difficulty: s
+  Tags: graph weighted-graph routing-algorithm
   """
   alias AdventOfCode.Helpers.{InputReader, Transformers}
 
@@ -16,7 +18,7 @@ defmodule AdventOfCode.Y2015.Day09 do
   def run_1(input), do: input |> travel_all(&Enum.min/1)
   def run_2(input), do: input |> travel_all(&Enum.max/1)
 
-  def parse(data) do
+  def parse(data \\ input()) do
     data
     |> Transformers.lines()
     |> Enum.map(fn route ->

lib/2015/day_10.ex

@@ -2,6 +2,8 @@ defmodule AdventOfCode.Y2015.Day10 do
   @moduledoc """
   --- Day 10: Elves Look, Elves Say ---
   Problem Link: https://adventofcode.com/2015/day/10
+  Difficulty: xs
+  Tags: string-encoding sequence reduction
   """
   alias AdventOfCode.Helpers.InputReader
 

lib/2015/day_11.ex

@@ -2,6 +2,8 @@ defmodule AdventOfCode.Y2015.Day11 do
   @moduledoc """
   --- Day 11: Corporate Policy ---
   Problem Link: https://adventofcode.com/2015/day/11
+  Difficulty: xs
+  Tags: sequence char-sequence validation
   """
   alias AdventOfCode.Helpers.InputReader
 

lib/2015/day_12.ex

@@ -2,6 +2,8 @@ defmodule AdventOfCode.Y2015.Day12 do
   @moduledoc """
   --- Day 12: JSAbacusFramework.io ---
   Problem Link: https://adventofcode.com/2015/day/12
+  Difficulty: xs
+  Tags: json parsing
   """
   alias AdventOfCode.Helpers.InputReader
 

lib/2015/day_13.ex

@@ -2,6 +2,8 @@ defmodule AdventOfCode.Y2015.Day13 do
   @moduledoc """
   --- Day 13: Knights of the Dinner Table ---
   Problem Link: https://adventofcode.com/2015/day/13
+  Difficulty: s
+  Tags: brute-force permutations slow
   """
   alias AdventOfCode.Helpers.{InputReader, Transformers}
 
@@ -18,7 +20,7 @@ defmodule AdventOfCode.Y2015.Day13 do
     }
   end
 
-  def parse(data) do
+  def parse(data \\ input()) do
     facts =
       data
       |> Transformers.lines()