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paper_forge

0.1.0
0.3.0 0.2.0 0.1.0

A pure Elixir PDF generation engine with multi-page documents, text layout, vector graphics, standard PDF fonts, embedded TrueType fonts, Unicode visible text, JPEG and PNG images, transparency, compression, page margins, coordinate systems, and metadata.

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paper_forge lib paper_forge metadata.ex
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lib/paper_forge/metadata.ex 

defmodule PaperForge.Metadata do

  @moduledoc """

  Represents basic PDF document metadata.

  """



  defstruct title: nil,

            author: nil,

            subject: nil,

            keywords: [],

            creator: "PaperForge",

            producer: "PaperForge"



  @type t :: %__MODULE__{

          title: binary() | nil,

          author: binary() | nil,

          subject: binary() | nil,

          keywords: [binary()],

          creator: binary() | nil,

          producer: binary() | nil

        }



  @spec new(keyword()) :: t()

  def new(options \\ []) do

    struct!(__MODULE__, options)

  end



  @spec to_dictionary(t()) :: map()

  def to_dictionary(%__MODULE__{} = metadata) do

    %{}

    |> put_optional("Title", metadata.title)

    |> put_optional("Author", metadata.author)

    |> put_optional("Subject", metadata.subject)

    |> put_optional("Creator", metadata.creator)

    |> put_optional("Producer", metadata.producer)

    |> put_keywords(metadata.keywords)

  end



  defp put_optional(dictionary, _key, nil), do: dictionary

  defp put_optional(dictionary, key, value), do: Map.put(dictionary, key, value)



  defp put_keywords(dictionary, []), do: dictionary



  defp put_keywords(dictionary, keywords) do

    Map.put(dictionary, "Keywords", Enum.join(keywords, ", "))

  end

end