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Using dunolint as an Emacs reformatter

dunolint can be used to automatically reformat dune files during editing with Emacs using the reformatter package. Once the latter is installed, a dunolint reformatter can be configured as such:

(reformatter-define dunolint-format
  :program "dunolint"
  :args (list "tools" "lint-file" "--filename" (buffer-file-name))
  :lighter " DoF")