Custom backend for elixir compilation warnings

[Boris Kuznetsov]

Hi,

I’m working on console application written in elixir.

I would like to make it “live editable”, so I run it with mix run --no-halt.

It has shortcut to trigger recompilation with IEx.Helpers.recompile().

The issue I have is that many parts of elixir write to stdout when you trigger recompilation.

So far, it has two type of messages:

1) success / failure messages, handled by Mix.shell.info/1, Mix.shell.error/1

2) compilation warning messages, handled by :elixir_errors module.

Mix.shell allows you to define custom behaviour for its actions with Mix.shell(Custom.MixShell).

To do the same thing with :elixir_errors Erlang’s module, you have to re-define it from scratch.

Is it possible to have custom backend for :elixir_errors module?

The issue I’m trying to resolve is my application has many virtual windows and I want to show all warnings / errors in separate windows, i.e. redirect output from stdout to some file as an example.

Thank you.

[José Valim]

Hi Boris!

The compile mix tasks already returns all diagnostics as a data structure, so I would recommend you to implement your own IEx.Helper.recompile so you have access to those diagnostic values. It should be relatively straight-forward.

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[Boris Kuznetsov]

Probably I could get the resulting data structure, but the real challenge I think is to suppress all the stdout messages issued by many different mix tasks used in recompilation process.

Here is the example:

https://github.com/elixir-lang/elixir/blob/master/lib/elixir/lib/kernel/typespec.ex#L152

When we trigger recompilation, we still get this warning to the main window’s stdout.

The only way I can see how to remove it from stdout is to override the :elixir_errors.erl_warn/3 function.

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