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A collection of handy Elixir macros for CQRS applications.
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lib/cqrs/documentation.ex
defmodule Cqrs.Documentation do
@moduledoc false
alias Cqrs.Documentation
defmacro option_docs(options) do
quote bind_quoted: [options: options] do
docs =
Enum.map(options, fn {name, type, opts} ->
default = Keyword.get(opts, :default, "nil")
description =
case Keyword.get(opts, :description) do
nil -> ""
desc -> ". " <> String.trim_trailing(desc, ".") <> "."
end
"* `#{name}`: `:#{type}`#{description} Defaults to `#{inspect(default)}`.\n"
end)
if length(docs) > 0 do
"""
## Options
#{docs}
"""
else
""
end
end
end
defmacro field_docs(title, fields, required_fields) do
quote bind_quoted: [title: title, fields: fields, required_fields: required_fields] do
{required_fields, optional_fields} =
Enum.split_with(fields, fn {name, _type, _opts} ->
Enum.member?(required_fields, name)
end)
required_field_docs = Documentation.__fields_docs__(required_fields, "Required")
optional_field_docs = Documentation.__fields_docs__(optional_fields, "Optional")
"""
## #{title}
#{required_field_docs}
#{optional_field_docs}
"""
end
end
defmacro __fields_docs__(fields, title) do
quote do
field_docs =
unquote(fields)
|> Enum.reject(fn {_name, _type, opts} -> Keyword.get(opts, :internal, false) end)
|> Enum.map(fn {name, type, opts} ->
description =
case Keyword.get(opts, :description) do
nil -> ""
desc -> ". " <> String.trim_trailing(desc, ".") <> "."
end
field_type =
case type do
Ecto.Enum -> opts |> Keyword.fetch!(:values) |> Enum.join(" | ")
type when is_tuple(type) -> inspect(type)
_ -> type
end
defaults =
case Keyword.get(opts, :default) do
nil -> nil
default -> "Defaults to `#{inspect(default)}`."
end
"""
* `#{name}`: `:#{field_type}`#{description} #{defaults}
"""
end)
if length(field_docs) > 0 do
"""
### #{unquote(title)}
#{field_docs}
"""
end
end
end
end