AdventOfCode/dayN.exs

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Elixir
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defmodule DayREPLACE_ME do
def part1(input) do
input
end
def part2(_input) do
:ok
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end
def input do
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with [input_filename] <- System.argv(),
{:ok, input} <- File.read(input_filename) do
input
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else
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_ -> :error
end
end
#######################
# HERE BE BOILERPLATE #
#######################
def run do
case input() do
:error -> print_usage()
input -> run_parts_with_timer(input)
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end
end
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defp run_parts_with_timer(input) do
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run_with_timer(1, fn -> part1(input) end)
run_with_timer(2, fn -> part2(input) end)
end
defp run_with_timer(part, fun) do
{time, result} = :timer.tc(fun)
IO.puts("Part #{part} (completed in #{format_time(time)}):\n")
IO.puts("#{result}\n")
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end
defp format_time(μsec) when μsec < 1_000, do: "#{μsec}μs"
defp format_time(μsec) when μsec < 1_000_000, do: "#{μsec / 1000}ms"
defp format_time(μsec), do: "#{μsec / 1_000_000}s"
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defp print_usage do
IO.puts("Usage: elixir dayREPLACE_ME.exs input_filename")
end
end
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# DayREPLACE_ME.run()