62 lines
1.5 KiB
Elixir
62 lines
1.5 KiB
Elixir
defmodule ChiyaWeb.Markdown do
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@moduledoc """
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Module used for rendering markdown.
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Rendering also collects and replaces internal [references](`Mirage.References`) to other entities like Lists and Tags.
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"""
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import Ecto.Changeset, only: [get_change: 2, put_change: 3]
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def options(),
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do: %Earmark.Options{
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code_class_prefix: "lang- language-",
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footnotes: true,
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breaks: true,
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escape: false,
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registered_processors: processors()
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}
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@doc """
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Renders markdown with Earmark.
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"""
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def render(markdown) do
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markdown
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|> ChiyaWeb.References.replace_references()
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|> Earmark.as_html!(options())
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end
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@doc """
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Renders markdown to HTML inside a changeset if markdown changed.
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Markdown field and HTML field can be configured.
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"""
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def maybe_render(changeset, markdown_field, html_field) do
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if markdown = get_change(changeset, markdown_field) do
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html = render(markdown)
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put_change(changeset, html_field, html)
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else
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changeset
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end
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end
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def processors() do
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heading = fn
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{_, _, [content], _} = n when is_binary(content) ->
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slug = Slugger.slugify_downcase(content)
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Earmark.AstTools.merge_atts_in_node(n, id: slug)
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node ->
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node
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end
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[
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Earmark.TagSpecificProcessors.new([
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{"h1", heading},
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{"h2", heading},
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{"h3", heading},
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{"h4", heading},
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{"h5", heading},
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{"h6", heading}
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])
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]
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end
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end
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