54 lines
1.1 KiB
Elixir
54 lines
1.1 KiB
Elixir
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defmodule PreDotHn.Frontmatter do
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@frontmatter_pattern ~r/---\r?\n/
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def make_frontmatter(path, frontmatter_text) do
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case YamlElixir.read_from_string(frontmatter_text) do
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{:ok, fm} ->
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fm
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_other ->
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%{}
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end
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|> merge_frontmatter_defaults(path)
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end
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def merge_frontmatter_defaults(fm, path) do
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{date, slug} = path_parts(path)
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fm
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|> Map.put_new_lazy("slug", fn ->
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slug
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end)
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|> Map.put_new_lazy("date", fn ->
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date
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end)
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|> Map.put_new_lazy("title", fn ->
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""
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end)
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end
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@path_parts ~r/([0-9]{4}-[0-9]{2}-[0-9]{2})?-?(.*)?/
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def path_parts(path) do
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filename = Path.basename(path)
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[basename | _] = String.split(filename, ".")
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[_, date_part, slug_part] = Regex.run(@path_parts, basename)
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date_part = if date_part == "", do: nil, else: date_part
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slug_part = if slug_part == "", do: date_part, else: slug_part
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{date_part, slug_part}
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end
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def front_matter_split(body) do
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case String.split(body, @frontmatter_pattern, parts: 3) do
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["", frontmatter, body] ->
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{frontmatter, body}
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_other ->
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{"", body}
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end
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end
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end
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