About
The unconvert program analyzes Go packages to identify unnecessary
type conversions; i.e., expressions T(x) where x already has type T.
Install
$ go get github.com/mdempsky/unconvert
Usage
$ unconvert -v bytes fmt
GOROOT/src/bytes/reader.go:117:14: unnecessary conversion
abs = int64(r.i) + offset
^
GOROOT/src/fmt/print.go:411:21: unnecessary conversion
p.fmt.integer(int64(v), 16, unsigned, udigits)
^
Flags
Using the -v flag, unconvert will also print the source line and a
caret to indicate the unnecessary conversion's position therein.
Using the -apply flag, unconvert will rewrite the Go source files
without the unnecessary type conversions.
Using the -all flag, unconvert will analyze the Go packages under all
possible GOOS/GOARCH combinations, and only identify conversions that
are unnecessary in all cases.
E.g., syscall.Timespec's Sec and Nsec fields are int64 under
linux/amd64 but int32 under linux/386. An int64(ts.Sec) conversion
that appears in a linux/amd64-only file will be identified as
unnecessary, but it will be preserved if it occurs in a file that's
compiled for both linux/amd64 and linux/386.