146 lines
3.1 KiB
Elixir
146 lines
3.1 KiB
Elixir
defmodule TodoServer do
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def start(entries \\ []) do
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spawn(fn -> loop(TodoList.new(entries)) end)
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end
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def from_list(todo_list) do
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spawn(fn -> loop(todo_list) end)
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end
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defp loop(todo_list) do
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new_todo_list =
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receive do
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message ->
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process_message(todo_list, message)
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after
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1000 -> todo_list
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end
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loop(new_todo_list)
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end
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defp process_message(todo_list, {:add, entry}) do
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TodoList.add(todo_list, entry)
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end
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defp process_message(todo_list, {:entries, sender, date}) do
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entries = TodoList.entries(todo_list, date)
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send(sender, {:entries, entries})
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todo_list
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end
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defp process_message(todo_list, {:update, id, update_fun}) do
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TodoList.update(todo_list, id, update_fun)
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end
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defp process_message(todo_list, {:delete, id}) do
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TodoList.delete(todo_list, id)
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end
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defp process_message(todo_list, invalid_message) do
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IO.puts("Invalid message: #{IO.inspect(invalid_message)}")
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todo_list
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end
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def add(pid, entry) do
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send(pid, {:add, entry})
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nil
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end
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def entries(pid, date) do
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send(pid, {:entries, self(), date})
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receive do
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{:entries, value} ->
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{:ok, value}
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after
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1000 -> {:error}
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end
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end
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def update(pid, id, update_fun) do
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send(pid, {:update, id, update_fun})
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nil
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end
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def delete(pid, id) do
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send(pid, {:delete, id})
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nil
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end
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end
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defmodule TodoList do
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defstruct entries: %{}, next_id: 1
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def new(entries \\ []) do
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Enum.reduce(entries, %__MODULE__{}, &add(&2, &1))
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end
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def add(
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%__MODULE__{entries: entries, next_id: next_id} = todo_list,
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%{date: _, title: _} = entry
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) do
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new_entry = Map.put(entry, :id, next_id)
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new_entries = Map.put(entries, next_id, new_entry)
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%__MODULE__{todo_list | entries: new_entries, next_id: next_id + 1}
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end
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def entries(%__MODULE__{} = todo_list, date) do
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todo_list.entries
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|> Map.filter(fn {_, entry} -> entry.date == date end)
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|> Map.values()
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end
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def update(%__MODULE__{entries: entries} = todo_list, id, update_fun)
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when is_function(update_fun, 1) do
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case Map.fetch(entries, id) do
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:error ->
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todo_list
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{:ok, entry} ->
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new_entry = update_fun.(entry)
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new_entries = Map.put(entries, id, new_entry)
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%__MODULE__{todo_list | entries: new_entries}
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end
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end
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def delete(%__MODULE__{entries: entries} = todo_list, id) when is_number(id) do
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new_entries = Map.delete(entries, id)
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%__MODULE__{todo_list | entries: new_entries}
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end
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end
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defmodule TodoList.CSVImporter do
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def import(path) do
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path
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|> File.stream!()
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|> Stream.map(&parse_line/1)
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|> TodoList.new()
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end
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defp parse_line(line) do
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line
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|> String.trim()
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|> String.split(",")
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|> create_entry()
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end
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defp create_entry([date, title]) do
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final_date = parse_date(date)
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%{date: final_date, title: title}
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end
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defp parse_date(string) do
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[year, month, day] = string |> String.split("-") |> Enum.map(&String.to_integer/1)
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Date.new!(year, month, day)
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end
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end
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