This is a 'formatexpr' plugin.

License: public domain

Usage: :set runtimepath+=/path/to/autofmt/ :set formatexpr=autofmt#compat#formatexpr()

Following method can be used: autofmt#compat#formatexpr(): Vim compatible autofmt#uax14#formatexpr(): Implementation of UAX #14 autofmt#japanese#formatexpr(): Japanese

See doc/autofmt.txt for more information.