65 lines
1.6 KiB
Elixir
65 lines
1.6 KiB
Elixir
defmodule PreDotHn.Markdown do
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@default_opts [pure_links: true, wikilinks: true, inner_html: false]
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def render(source, opts \\ []) do
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opts = Keyword.merge(@default_opts, opts, fn _key, _default_value, value -> value end)
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inner_html = Keyword.get(opts, :inner_html, false)
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EarmarkParser.as_ast(source || "", opts)
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|> case do
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{:ok, ast, _} ->
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ast
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|> Earmark.Transform.map_ast(&transformer/1)
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|> Enum.map(&maybe_remove_para(&1, inner_html))
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other ->
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other
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end
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|> Earmark.Transform.transform()
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end
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defp transformer({"a", attrs, ignored, %{wikilink: true} = meta}) do
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attrs =
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attrs
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|> Enum.map(fn
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{"href", href} ->
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{"href", "/notes#{href}"}
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other ->
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other
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end)
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{"a", attrs, ignored, meta}
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end
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defp transformer({"a", attrs, ignored, meta}) do
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href = Enum.find_value(attrs, "", fn {key, value} -> key == "href" && value end)
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href_uri = URI.parse(href)
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is_internal = href_uri.host in [host(), nil]
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attrs =
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if is_internal do
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attrs
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else
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[{"target", "_blank"} | attrs]
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end
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{"a", attrs, ignored, meta}
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end
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defp transformer(other), do: other
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defp maybe_remove_para(node, false), do: node
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defp maybe_remove_para({"p", _attrs, children, _meta}, true),
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do: Enum.map(children, &add_trailing_newline/1)
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defp maybe_remove_para(other, true), do: other
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defp add_trailing_newline(string) when is_binary(string), do: "#{string}\n"
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defp add_trailing_newline(other), do: other
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defp host(), do: Application.get_env(:pre_dot_hn, :host)
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end
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