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Add behaviour to __using__ macro #21

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Add behaviour to __using__ macro #21

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13 changes: 13 additions & 0 deletions lib/fsmx/fsm.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,8 @@ defmodule Fsmx.Fsm do
{:ok, struct} | {:error, any}

if Code.ensure_loaded?(Ecto) do
@callback transition_changeset(Ecto.Schema.t(), Fsmx.state_t(), Fsmx.state_t(), map()) ::
Ecto.Changeset.t()
@callback transition_changeset(Ecto.Schema.t(), Fsmx.state_t(), Fsmx.state_t(), map(), atom()) ::
Ecto.Changeset.t()
@callback after_transition_multi(struct, Fsmx.state_t(), Fsmx.state_t(), atom()) ::
Expand All @@ -50,6 +52,11 @@ defmodule Fsmx.Fsm do
{state_field, _} = Code.eval_quoted(Keyword.get(opts, :state_field, :state))

quote do
if not Module.get_attribute(__MODULE__, :__fsmx__behaviour, false) do
@behaviour Fsmx.Fsm
Module.put_attribute(__MODULE__, :__fsmx__behaviour, true)
end

@before_compile unquote(__MODULE__)

def __fsmx__(unquote(state_field), :transitions),
Expand All @@ -61,11 +68,17 @@ defmodule Fsmx.Fsm do

defmacro __before_compile__(_env) do
quote generated: false do
@impl Fsmx.Fsm
def before_transition(struct, _from, _to, _state_field), do: {:ok, struct}

if Code.ensure_loaded?(Ecto) do
@impl Fsmx.Fsm
def transition_changeset(changeset, _from, _to, _params), do: changeset

@impl Fsmx.Fsm
def transition_changeset(changeset, _from, _to, _params, _state_field), do: changeset

@impl Fsmx.Fsm
def after_transition_multi(struct, _from, _to, _state_field), do: {:ok, struct}
end
end
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