What you want to get is to make this module to be available for arcanist. There are a couple of ways to achieve it depending on your requirements.

Right now swiftlint should be installed beforehand. On OS X you can do it through homebrew brew install swiftlint.

You also have to configure your rules in .swiftlint.yml (documentation)

You can add this repository as a git submodule and in this case .arcconfig should look like:

{
  "load": ["path/to/submodule"]
  // ...
}

arcanist can load modules from an absolute path. But there is one more trick - it also searches for modules in a directory up one level from itself.

It means that you can clone this repository to the same directory where arcanist and libphutil are located. In the end it should look like this:

> ls
arcanist
swift-linter
libphutil

In this case you .arcconfig should look like

{
  "load": ["swift-linter"]
  // ...
}

Another approach is to clone swift-linter to a fixed location and use absolute path like:

cd ~/.dev-tools
git clone https://github.com/vhbit/swift-linter

{
  "load": ["~/.dev-tools/swift-linter"]
  // ...
}

Both ways of global installation are actually almost equally as in most cases you'd like to have a bootstrapping script for all tools.

Once installed, linter can be used and configured just as any other arcanist linter

Here is a simplest .arclint:

{
    "linters": {
        "swift": {
            "type": "swift-lint",
            "include": "(^Source/.*\\.swift$)"
        },
        // ...
    }
}