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lib/toml.ex
defmodule Fnord.Toml do
@moduledoc """
TOML parsing utilities.
This module is a wrapper around the third-party `:toml` package.
The rest of the codebase should depend on this wrapper rather than calling
the external library directly. This keeps TOML usage consistent across
features and makes it easy to swap parser implementations later.
All functions return `{:ok, map}` on success and `{:error, reason}` on failure.
"""
@type decode_error ::
{:toml_decode_error, String.t()}
| {:toml_file_error, path :: String.t(), reason :: term()}
@spec decode(binary) :: {:ok, map()} | {:error, decode_error}
def decode(toml) when is_binary(toml) do
toml
|> Toml.decode()
|> case do
{:ok, data} when is_map(data) ->
{:ok, data}
{:error, reason} ->
{:error, {:toml_decode_error, format_decode_error(reason)}}
end
end
@spec decode_file(String.t()) :: {:ok, map()} | {:error, decode_error}
def decode_file(path) when is_binary(path) do
case File.read(path) do
{:ok, contents} ->
contents
|> Toml.decode(filename: path)
|> case do
{:ok, data} when is_map(data) ->
{:ok, data}
{:error, reason} ->
{:error, {:toml_decode_error, format_decode_error(reason)}}
end
{:error, reason} ->
{:error, {:toml_file_error, path, reason}}
end
end
defp format_decode_error(reason) do
if is_binary(reason) do
reason
else
inspect(reason)
end
end
end