If you want to change private bar to public Bar from package foo, the standard trick is to use gofmt's rewrite option and run "gofmt -r 'foo.bar -> foo.Bar' -w

If you want to change private bar to public Bar from package foo, the standard trick is to use gofmt's rewrite option and run "gofmt -r 'foo.bar -> foo.Bar' -w *.go".