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lib/external_configs/frontmatter.ex
defmodule ExternalConfigs.Frontmatter do
@moduledoc """
Parses YAML frontmatter out of markdown-like documents.
Supported input:
---
key: value
other: [a, b]
---
Body markdown goes here.
Returns `{:ok, %{frontmatter: map(), body: binary()}}` on success. Inputs
that do not contain a complete `---` ... `---` block (no opener, or an
opener without a closer) are returned as body with an empty frontmatter
map. The original content is preserved verbatim so callers can still
display or re-parse it.
"""
@type parsed :: %{frontmatter: map(), body: binary()}
@spec parse(binary()) :: {:ok, parsed} | {:error, term()}
def parse(content) when is_binary(content) do
case split(content) do
{:no_frontmatter, body} ->
{:ok, %{frontmatter: %{}, body: body}}
{:ok, yaml, body} ->
case decode_yaml(yaml) do
{:ok, map} -> {:ok, %{frontmatter: map, body: body}}
{:error, reason} -> {:error, {:invalid_yaml, reason}}
end
end
end
# Splits the input into (yaml, body). Recognizes a leading `---` fence
# (optionally preceded by a UTF-8 BOM and/or blank lines) and the closing
# `---` fence that terminates the frontmatter block.
@spec split(binary()) ::
{:ok, binary(), binary()} | {:no_frontmatter, binary()}
defp split(content) do
stripped = strip_bom(content)
case String.split(stripped, ~r/\r?\n/, parts: 2) do
[first, rest] ->
if fence?(first) do
case split_body(rest) do
{:ok, yaml, body} -> {:ok, yaml, body}
:no_close -> {:no_frontmatter, content}
end
else
{:no_frontmatter, content}
end
_ ->
{:no_frontmatter, content}
end
end
defp fence?(line), do: String.trim(line) == "---"
defp split_body(rest) do
lines = String.split(rest, ~r/\r?\n/)
do_split_body(lines, [])
end
defp do_split_body([], _acc), do: :no_close
defp do_split_body([line | tail], acc) do
if fence?(line) do
yaml = acc |> Enum.reverse() |> Enum.join("\n")
body = Enum.join(tail, "\n")
{:ok, yaml, body}
else
do_split_body(tail, [line | acc])
end
end
defp strip_bom(<<0xEF, 0xBB, 0xBF, rest::binary>>), do: rest
defp strip_bom(other), do: other
defp decode_yaml("") do
{:ok, %{}}
end
defp decode_yaml(yaml) do
case YamlElixir.read_from_string(yaml) do
{:ok, map} when is_map(map) -> {:ok, map}
# Empty YAML documents can decode to nil; treat that as empty frontmatter.
{:ok, nil} -> {:ok, %{}}
{:ok, other} -> {:error, {:not_a_mapping, other}}
{:error, reason} -> {:error, reason}
end
end
end