$ gl commit -m "foo and bar"
$ gl commit -m "only foo" foo.py
$ gl commit -m "only foo and baz" foo.py baz.py
$ gl commit -m "only foo" -e bar.py
$ gl commit -m "only foo and baz" -e bar.py -i baz.py
$ gl commit -m "foo, bar and baz" -i baz.py