Adding support for Elixir pre-commits

[atavistock]

Adds support for common Elixir precommit hooks

• Built-in syntax formatter
• Built-in test runner
• Static code analysis via Credo
• Static code analysis via Dialyzer

Two of these are built-in to Elixir itself but two are added via a mix file. I've added both credo and dialyzer by hand to my environment using Elixir mix, and I'm not sure if theres a reasonable way to check for them.

[domenkozar]

@atavistock do you want to fix this PR?

[atavistock]

Yes, just haven't been able to circle back to it. Will have more time later this week.

…

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[atavistock]

@domenkozar Fixed the typos and updated to match current master branch

[atavistock]

Looks like a close bracket was lost, now fixed.

[atavistock]

Okay, only on the OS/X tests its getting:

  Could not set environment: 150: Operation not permitted while System Integrity Protection is engaged
  Error: Process completed with exit code 150.

This far beyond my OS/X and Nix knowledge. Is this something anyone else has seen before? I will try to dig into this but I'm not sure I will be able to in a reasonable time.

[domenkozar]

You'll need to rebase on top of master.

[domenkozar]

Ping :)

[nifoc]

As far as I can tell, pre-commit doesn't understand elixir as a type tag. I get the following error:

Type tag 'elixir' is not recognized.  Try upgrading identify and pre-commit?

Checking the identify repository, it indeed looks like elixir is not supported at the moment.

How is this supposed to work? Can you somehow configure type tags manually? (Couldn't find anything obvious on pre-commit.com)

[nifoc]

Submitted a PR to identify and the above error is now gone.

However, nix flake check does not work, because:

• Dependencies are not copied into the drv (because they're part of the .gitignore)

       > Shall I install Hex? (if running non-interactively, use "mix local.hex --force") [Yn] ** (Mix) Could not find an SCM for dependency :ecto from Pan.MixProject
       > Could not find Hex, which is needed to build dependency :ecto