FixWarnings

Automatically fixes compiler warnings in your Elixir project.

Does that look familiar?

Compiling 5 files (.ex)
warning: variable "params" is unused
  lib/controller.ex:24

... 500 lines more...

warning: variable "curr_line" is unused
  lib/foo.ex:31

FixWarnings automatically fixes the trivial warnings directly in your Elixir source code. It removes unused aliases and adds a _ prefix to unused variables with.

Alpha Warning

I extracted this from a quickly hacked together script, which worked well for me. But don't trust this blindly yet, verify with git diff first.

Limitations:

• You have to manually copy the log output that contains the warnings into a file

Guide

Add fix_warnings to your mix.exs.

def deps do
  [
    {:fix_warnings, "~> 0.1.0", only: :dev}
  ]
end

Install dependency

mix deps.get

Clean your files so that everything is compiled from scratch:

mix clean

Run your Elixir. E.g. for a phoenix application:

clear # empty the console window, so we can copy the ouptut.
mix

Manually copy (as in Cmd+a, Cmd+c, Cmd+v) the console output that contains all the warnings into a file (Note to myself: there must be multiple better ways to achieve this).

Now run fix_warnings.

mix fix_warnings -f path/to/output.log

Enjoy

git diff

TODOs (PRs welcome)

• There might be a few edge-cases
• Find a way so fix_warnings can tap into STDERR directly, so we don't have to mess with around copying console output to files.
• Add more warnings
• Refactor mix task