[Feature request] Add version and expose through flag

[mx-psi]

Hi, it would be useful for debugging if ineffassign was versioned and one could get that version through --version flag. Right now it's hard to know what version of ineffassign is installed. Ideally one would get the commit of the build but I don't know if that can be done easily and keep the installation through go get.

[gordonklaus]

I can see how this would be useful if you don't have control over which version you're running. Maybe in the meantime you can depend on a specific version? go get supports version tags, as in:

GO111MODULE=on go get github.com/gordonklaus/ineffassign@v0.0.0-20210103220932-664217a59c00

(You need GO111MODULE=on when running outside a module, until Go module mode is the default.)

It looks like we might be able to use runtime/debug.BuildInfo to get the version but I also see that there are open issues about getting the version of the main module. Needs investigation.

[kolyshkin]

With go 1.18, you can use

[kir@kir-rhat ~]$ go version -m `which ineffassign`
/home/kir/go/bin/ineffassign: go1.18.1
	path	github.com/gordonklaus/ineffassign
	mod	github.com/gordonklaus/ineffassign	v0.0.0-20210914165742-4cc7213b9bc8	h1:PVRE9d4AQKmbelZ7emNig1+NT27DUmKZn5qXxfio54U=
	dep	golang.org/x/mod	v0.4.2	h1:Gz96sIWK3OalVv/I/qNygP42zyoKp3xptRVCWRFEBvo=
	dep	golang.org/x/sys	v0.0.0-20210510120138-977fb7262007	h1:gG67DSER+11cZvqIMb8S8bt0vZtiN6xWYARwirrOSfE=
	dep	golang.org/x/tools	v0.1.5	h1:ouewzE6p+/VEB31YYnTbEJdi8pFqKp4P4n85vwo3DHA=
	dep	golang.org/x/xerrors	v0.0.0-20200804184101-5ec99f83aff1	h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
	build	-compiler=gc
	build	CGO_ENABLED=1
	build	CGO_CFLAGS=
	build	CGO_CPPFLAGS=
	build	CGO_CXXFLAGS=
	build	CGO_LDFLAGS=
	build	GOARCH=amd64
	build	GOOS=linux
	build	GOAMD64=v1