cmd/gofmt: ignore wildcards in gofmt -r

[joeshaw]

go version go1.2.1 darwin/amd64

I love the wildcard feature of gofmt -r, but it is also idiomatic to use single
character identifiers in Go code.  This makes it difficult to perform rewrites in
certain cases.

Suppose you have a file like http://play.golang.org/p/_6CvVWgy1v and you wanted to
change only the instance of f.Write().  If you ran gofmt -d -r 'f.Write([]byte(x)) ->
f.WriteString(x)', you would write both the f.Write() and g.Write() due to f being
interpreted as a wildcard.

I have a patch which adds a -i argument to gofmt to prevent one or more identifiers from
being interpreted as a wildcard, which I'll submit shortly.

[joeshaw]

Comment 1:

https://golang.org/cl/99790043/

[gopherbot]

Comment 2:

CL https://golang.org/cl/99790043 mentions this issue.

[griesemer]

Comment 3:

Labels changed: added release-none, repo-main.

Owner changed to @griesemer.

[rsc]

Comment 4:

gofmt -r is what it is. I don't think we should start adding new things to it.
If we need a full-blown refactoring tool, it should be somewhere else.
code.google.com/p/go.tools/cmd/eg is one promising start.

Status changed to WorkingAsIntended.