+### `--dir`
+Working directory (default is '.nitpretty').
+
+### `-o`, `--output`
+Output name (default is pretty.nit).
+
+### `--diff`
+Show diff between source and output.
+
+### `--meld`
+Show diff between source and output using meld.
+
+### `--check`
+Check format of Nit source files.
+
+This option creates a temporary pretty printed file then checks if the output
+of the diff command on the source file and the pretty printed one is empty.
+
+### `--break-strings`
+Break too long string literals.
+
+### `--inline-do`
+Force do keyword on the same line as the method signature.