feat: pad numbers

2021/lib/advent_of_code.ex

@@ -5,8 +5,17 @@ defmodule AdventOfCode do
 
   def solver(selector) do
     [day, part] = String.split(selector, ".")
-    day_module = Macro.camelize("Day#{day}")
+    part_module(day, part)
-    part_module = Macro.camelize("Part#{part}")
-    Module.concat([AdventOfCode, day_module, part_module])
   end
+
+  def part_module(day, part) do
+    Module.concat(day_module(day), Macro.camelize("Part#{part_number(part)}"))
+  end
+
+  def day_module(day) do
+    Module.concat(AdventOfCode, Macro.camelize("Day#{day_number(day)}"))
+  end
+
+  defp day_number(day), do: String.pad_leading(day, 2, "0")
+  defp part_number(part), do: String.trim_leading(part, "0")
 end

2021/lib/advent_of_code/day0/part0.ex

@@ -1,11 +0,0 @@
-defmodule AdventOfCode.Day0.Part0 do
-  alias AdventOfCode.PuzzleSolver
-
-  use PuzzleSolver
-
-  @impl PuzzleSolver
-  def solve(stream) do
-    Stream.run(stream)
-    "42"
-  end
-end

2021/lib/mix/advent_of_code.ex

@@ -3,11 +3,6 @@ defmodule Mix.AdventOfCode do
   Helpers for `AdventOfCode` mix tasks.
   """
 
-  def day_module(day) do
+  defdelegate day_module(day), to: AdventOfCode
-    Module.concat(AdventOfCode, Macro.camelize("Day#{day}"))
+  defdelegate part_module(day, part), to: AdventOfCode
-  end
-
-  def part_module(day, part) do
-    Module.concat(day_module(day), Macro.camelize("Part#{part}"))
-  end
 end

2021/priv/inputs/0.0.input

@@ -1,3 +0,0 @@
-foo
-bar
-baz

2021/test/advent_of_code/day0/part_0_test.exs

@@ -1,7 +0,0 @@
-defmodule AdventOfCode.Day0.Part0Test do
-  use AdventOfCode.PuzzleCase, module: AdventOfCode.Day0.Part0
-
-  test "returns the answer to live the universe and everything" do
-    assert_solution "life the universe and everything", "42"
-  end
-end

2021/test/advent_of_code_test.exs

@@ -5,9 +5,17 @@ defmodule AdventOfCodeTest do
 
   describe "solver/1" do
     test "returns a module for a solver" do
-      assert solver("1.1") == AdventOfCode.Day1.Part1
+      assert solver("1.1") == AdventOfCode.Day01.Part1
-      assert solver("2.2") == AdventOfCode.Day2.Part2
+      assert solver("2.2") == AdventOfCode.Day02.Part2
-      assert solver("3.1") == AdventOfCode.Day3.Part1
+      assert solver("3.1") == AdventOfCode.Day03.Part1
+    end
+
+    test "returns a solver module for zero padded numbers" do
+      assert solver("01.01") == AdventOfCode.Day01.Part1
+      assert solver("02.2") == AdventOfCode.Day02.Part2
+      assert solver("3.01") == AdventOfCode.Day03.Part1
+      assert solver("12.1") == AdventOfCode.Day12.Part1
+      assert solver("24.02") == AdventOfCode.Day24.Part2
     end
   end
 end