This fixes a case where adding an import when there are is no
existing import declaration can corrupt the position of
comments attached to types. This was the last known
goimports/astutil corruption case.
See golang.org/issue/6884 for more details.
Unfortunately this requires changing the API to add a
*token.FileSet, which we should've had before. I will update
goimports (the only user of this API?) immediately after
submitting this.
This CL also contains a hack (used only in this case of no
imports): rather than fix the comment positions by hand
(something that only Robert might know how to do), it instead
just prints the AST, manipulates the source, and re-parses
the AST. We can fix up later.
Fixesgolang/go#6884
R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/38270043
Tests will still pass because it's marked as known broken,
but it will log the unexpected for now.
R=golang-dev, crawshaw
CC=golang-dev
https://golang.org/cl/27330043
Lifts the import management utilities from gofix into
a package, so they can be used by goimports.
R=bradfitz
CC=golang-dev
https://golang.org/cl/22430043
