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0.1.1
A SMPTE timecode library for Elixir
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lib/ecto/postgres/pg_utils.ex
defmodule Vtc.Ecto.Postgres.Utils do
@moduledoc false
@typedoc """
Alias of String.t() that hints raw SQL text.
"""
@type raw_sql() :: String.t()
## Exposes a macro for defining modules that will only be compiled if the caller
## has set `:vtc, Postrgrex, :include?` to `true` in their application config.
@spec __using__(Keyword.t()) :: Macro.t()
defmacro __using__(_) do
quote do
import Vtc.Ecto.Postgres.Utils, only: [defpgmodule: 2, when_pg_enabled: 1]
require Vtc.Ecto.Postgres.Utils
end
end
@doc """
Wraps defmodule, conditionally declaring the module during compilation
based on caller configuration.
"""
@spec defpgmodule(module(), do: Macro.t()) :: Macro.t()
defmacro defpgmodule(name, do: body) do
if_pg_enabled(fn ->
quote do
defmodule unquote(name) do
unquote(body)
end
end
end)
end
@doc """
Only executes if the calling application has Postgres types enabled.
"""
@spec when_pg_enabled(do: Macro.t()) :: Macro.t()
defmacro when_pg_enabled(do: body) do
if_pg_enabled(fn ->
quote do
unquote(body)
end
end)
end
defp if_pg_enabled(action, otherwise \\ fn -> nil end) do
if Code.ensure_loaded?(Ecto) and Code.ensure_loaded?(Postgrex) do
action.()
else
otherwise.()
end
end
end