It'd be nice if there the Bazel plugin had an option to automatically format bzl files on save. When using the open source Bazel, you tend to accumulate many bzl files, mostly related to third_party.
I found a workaround in the mean time:

The bazel team is working on a Skylark-specific linter/formatter (separate to buildifier for BUILD files). Once that's out, we'll look at auto-formatting .bzl files on save.
According to the buildifier codebase, this feature seems to be present - and it looks like the Bazel plugin has started linting my .bzl files. Has this been added and can this issue therefore be closed?
Thanks, it is fixed now, closing.
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I found a workaround in the mean time: