can be set with the `format.outputDirectory` configuration option.
The `-o` option takes precedence over `format.outputDirectory`.
To store patches in the current working directory even when
-`format.outputDirectory` points elsewhere, use `-o .`.
+`format.outputDirectory` points elsewhere, use `-o .`. All directory
+components will be created.
By default, the subject of a single patch is "[PATCH] " followed by
the concatenation of lines from the commit message up to the first blank