Find unnecessarily exported identifiers in a package and help unexport them.

Test and developed on Go 1.5

go get -u github.com/isaiah/unexport

# use -dryrun to show the changes, by default it will try to unexport the
# identifier by lowercase the first character
unexport -dryrun cmd/compile/internal/gc

# under your desired project in GOPATH
unexport
# or specify targeting pakcage
unexport cmd/compile/internal/gc

Note it doesn't go recursively into the package, you'll have to check each package separately.

Run unexport -help to check the other options

First it will analyze usage of each idenfiers of the current package in the whole scope of workspace (GOPATH & GOROOT), and then use gorename to check conflicts and apply the changes. For performance reasons, (thread safty & caching) the code is adopted from x/tools/refactor/rename.

This is the solution for the 5th Go challenge