How to change a module's source file attribute?

@file if I recall correctly. But it’s meant to be used for generated files only, as well as @line.

@file works on a function basis, not for the whole module unfortunately.

The closes I know is to strip the beam.

:beam_lib.strip_files(["Elixir.X.beam"]).

Honestly though I’m not sure why you would want to manipulate the source compile attribute. source and vsn are 2 quick checks in production that you are running the modules you think you should be running.

I want to manipulate it in generated modules, not in those written by hand of course.

The solution might be to use Module.create explicitly instead of using defmodule - you can alter the file in the environment passed in there.

I thought about that but there are issues.

For example, if we do like this

q = quote do
def foo, do: 1/0
def bar, do: 2/0
end
Module.create(Y, q, Map.put(__ENV__, :file, "y.ex"))

then when calling Y.foo() and Y.bar() the lines in the stracktraces are the same. I think this is because quote does not add metadata line: number in this case (only when the quotes are generated by the compiler when calling macros do they get the line: number metadata).

I also tried to do quote location: :keep do ... but then the file is the physical file, not y.ex.

The only solution I found is to do Macro.postwalk to add the metadata keep: {"y.ex", number} on every node that has the metadata line: number.

This solution is working well, but a more direct way would be preferable. The possibilities are:

1. have @file set the file for all following functions and macros, not only the next one

2. support quote location: "filepath" do and quote lines: true do

In fact, I think both points 1) and 2) would be useful for my and other use cases.

quote doesn’t, but calling a macro with AST does.

Yep, that’s what I said (unless I expressed myself badly )

Just clarifying that quoting into something is not the same as building Macro’s in Elixir (which is oddly different from other languages). ^.^;