`.swiftformat` config not detected

[nguyenvukhang]

Here's a minimal example:

// main.swift
class A {
    let v: Int
    init() {
        self.v = 0
    }
}

// .swiftformat
--self init-only

With these two files in the same folder and with swiftformat installed,

• Calling :Neoformat yields

  // main.swift
  class A {
      let v: Int
      init() {
          v = 0
      }
  }
  

• While calling :!swiftformat %:p yields the expected outcome:

  // main.swift
  class A {
      let v: Int
      init() {
          self.v = 0
      }
  }
  

I tried poking around in formatters/swift.vim and a bit in neoformat.vim but I can't quite isolate the issue.