Feature request: Custom failure message

[bholtbholt]

In some cases, especially front-end tools, lint failures can be automated. It would be nice to append a custom failure message when a particular tool fails.

For example:

pre-commit:
  parallel: true
  commands:
    eslint:
      tags: frontend javascript
      glob: "*.{js,jsx,ts,tsx}"
      runner: yarn eslint {staged_files}
      fail: Try running yarn lint:js --fix to automatically fix these errors

Output could look like

SUMMARY: (done in 9.76 seconds)
✔️  ujs-limit
✔️  jquery-limit
✔️  prettier
🥊  eslint
    Try running yarn lint:js --fix to automatically fix these errors
✔️  typecheck

[mrexox]

Hey, @bholtbholt! What do you think of the change in this PR - #301? Does it work for you?

[bholtbholt]

That change looks perfect @mrexox! Thanks for doing it 🙏