xdg
Go implementation of the XDG Base Directory Specification
...The package also includes the locations of well-known user directories, as well as other common directories such as fonts and applications. The current implementation supports most flavors of Unix, Windows, macOS and Plan 9. On Windows, where XDG environment variables are not usually set, the package uses Known Folders as defaults. Therefore, appropriate locations are used for common folders which may have been redirected.