Jeweller-Tsai

defmodule Node do
  defstruct value: "", children: []
end

Jeweller-Tsai

defmodule DateRange do

  defstruct first: nil, last: nil, first_gregorian_days: nil, last_greogorian_days: nil

  defmodule Operator do
    def first <~> last do
      DateRange.new first, last
    end
  end

Jeweller-Tsai

defmodule ExclusiveDateRange do

  defstruct first: nil, last: nil

  def new(first, last) do
    %ExclusiveDateRange{first: first, last: last}
  end

  defimpl Enumerable, for: ExclusiveDateRange do
    def reduce _dr, {:halt, acc}, _fun do

Jeweller-Tsai

def next %Date{year: y, month: m, day: d} do
  case Date.new(y, m, d + 1) do
    {:ok, nd} -> nd
    {:error, _} ->
      case Date.new(y, m + 1, 1) do
        {:ok, nd} -> nd
        {:error, _} ->
          {:ok, nd} = Date.new(y + 1, 1, 1)
          nd
      end

Jeweller-Tsai

# iterate through a date range, and print the dates
date_range |> Enum.each(fn date -> date |> inspect |> IO.puts end)

Jeweller-Tsai

defmodule DateRange do

  defstruct first: nil, last: nil

end

d1 = ~D[2016-07-01]
d2 = ~D[2016-07-31]
%DateRange{first: d1, last: d2} # => %DateRange{first: ~D[2016-07-01], last: ~D[2016-07-31]}

Jeweller-Tsai

def july do
  1..31
  |> Enum.map(fn i ->
      {:ok, d} = Date.new 2016, 7, i
      d
  end)
  |> Enum.filter(fn d ->
      !weekend?(d)
  end)
end

Jeweller-Tsai

d1 = Date.new 2016, 7, 1
d2 = Date.new 2016, 7, 31
(d1 .. d2).each { |d| puts d unless d.sunday? or d.saturday? }

Jeweller-Tsai

body = %{"title": "Creating an awesome worklog client using Elixir"} |> Poison.encode!
HTTPoison.post! @url, body, %{"Authorization" => "token your_access_token"}

Jeweller-Tsai

defmodule ElixirTail do
  def tail path do
    Stream.resource(fn -> File.open!(path) end,
    fn file ->
      case IO.read(file, :line) do
        :eof ->
          :timer.sleep 10
          {[], file}
        data ->
          IO.write data