Can you please explain why you need to know the execution mode.
The fact a library can compile different code depending if it is compile,
test, or something else is not something we should encourage.
On Thu, Dec 9, 2021 at 8:37 PM Ivan Rublev <ivan.rublev.busin...@gmail.com>
wrote:
> Hi folks,
> After delivering the library generating code from type specs, I realised
> that I'm missing the explicit indication of whether the function/macro is
> executed within the mix compile task, the mix test task, or interactively
> (iex / live book) during the compile-time.
>
> Here is the code to illustrate the use case:
> defmacro __using__(opts) do
> ...
> cond do
> in_mix_compile? ->
> # plan the code generation when mix compile finishes to resolve
> type dependencies between BEAM files.
> in_mix_test? ->
> # raise an error and suggest compiling the module as an .ex file
> for the test environment.
> true ->
> # we're in iex / live book, generate code immediately because type
> dependencies are resolved during the sequential definition of the modules.
> end
> end
>
> Currently, I use the following hacks to get to know the execution mode:
> def in_mix_compile?(module_env) do
> tracers = Map.get(module_env || %{}, :tracers, [])
> Enum.member?(tracers, Mix.Compilers.ApplicationTracer)
> end
>
> def in_mix_test?(_module_env) do
> not is_nil(GenServer.whereis(ExUnit.Server))
> end
>
> Is it an absurd idea to add the explicit field indicating execution mode
> like the following?:
> %Module.Env{
> execution_mode: :compile | :test | :interactive
> }
>
> that can be returned by __CALLER__ in a macro or by __EVN__ in a function.
>
> Warm regards,
> Ivan.
>
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