Run eslint from project root

[hochata]

The current proposed solution for #19 works fine, but I think there are a couple issues:

• First, I think it would be better if it worked out of the box. At least for me, it took me by surprise and at first I thought it was a configuration problem with the project rather than the package.
• It is another iteration of "Finding the root of a project". Emacs already has a builtin solution for this in the form of the project package

So this MR tries to run eslint from the project root found by project and fall-backs to the default directory if not inside a project.

[orzechowskid]

oh this is great, thank you!

[orzechowskid]

hm actually I don't believe this works correctly for monorepos. project-current returns the vc repository root which is not guaranteed to be the same as the directory containing the eslint config file. I've opened #32 , on branch bugfix/default-directory-with-project - would you be able to have a look and see if that change satisfies your use-case?

[hochata]

I actually added that option to fix a problem I had in a monorepo. My general point was that project can be tweaked to find the correct root instead of having a custom solution.

In this case, project-vc has a project-vc-extra-root-markerts variable that allows to define extra roots for a project. By adding "eslintrc.json" to it I can get it to pick the correct root.

Regardless, I just saw that this caused an issue with older Emacs version... my bad.

The solution you proposed would work fine for me. And it looks less likely to break things.