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A dependency-free utility library containing 100+ useful functions.

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moar lib io.ex
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lib/io.ex 

defmodule Moar.IO do

  # @related [test](test/io_test.exs)

  @moduledoc "IO-related functions"



  defmodule ANSI do

    @doc "Parses a string as described in `Moar.IO.cformat/2`"

    @spec parse(String.t()) :: iolist()

    def parse(string),

      do: Regex.split(pattern(), string, include_captures: true) |> Enum.map(&convert/1)



    @doc "Converts one formatting expression to an iolist"

    @spec convert(String.t()) :: iolist()

    def convert(string) do

      trimmed_string = String.trim(string)



      if String.first(trimmed_string) == "{" && String.last(trimmed_string) == "}" do

        [_, formats, text] = Regex.run(pattern(), trimmed_string)

        formats = formats |> String.split(~r/\W+/) |> Enum.map(&String.to_atom/1) |> maybe_unwrap_list()

        [formats, text, :reset]

      else

        string

      end

    end



    defp maybe_unwrap_list([item]), do: item

    defp maybe_unwrap_list(list) when is_list(list), do: list



    defp pattern, do: ~r/\{([^:]+):\s?([^\}]*)}/

  end



  @doc "Formats a string and prints it to stdout. See `cformat/2` for details."

  @spec cputs(String.t(), boolean()) :: :ok

  def cputs(string, emit? \\ IO.ANSI.enabled?()),

    do: string |> cformat(emit?) |> IO.puts()



  @doc """

  Accepts a string with special formatting syntax and converts it into an `iolist` that contains

  ANSI color and formatting codes. The second parameter, `emit?` can be used to enable or disable

  formatting; it defaults to the value of `IO.ANSI.enabled?/0`.



  The formatting syntax looks like:



      "My {green: hovercraft} is {red italic: full of eels}!"



  The formatting options are the ANSI codes that are allowed to be sent to `IO.ANSI.format/2`.

  There doesn't seem to be a list of valid codes, but the names of most of the zero-arity functions

  in `IO.ANSI` can be used. The order of the formatting options is not important.



  The resulting iolist can be used anywhere that iodata is expected. This module's `cstring/2` function

  will take the same input and return a string, and `cputs/2` will take the same input and print it to

  stdout.

  """

  @spec cformat(String.t(), boolean()) :: iolist()

  def cformat(string, emit? \\ IO.ANSI.enabled?()),

    do: string |> Moar.IO.ANSI.parse() |> IO.ANSI.format_fragment(emit?)



  @doc "Formats a string and returns the formatted string. See `cformat/2` for details."

  @spec cstring(String.t(), boolean()) :: String.t()

  def cstring(string, emit? \\ IO.ANSI.enabled?()),

    do: string |> cformat(emit?) |> to_string()

end