signature

signature

signature finds low readability functions.

package a

// func decls
func _(_, _, _, _, _ int)    {}         // OK
func _(_, _, _, _, _, _ int) {}         // want "too many params"
func _() (_, _, _ int)       { return } // OK
func _() (_, _, _, _ int)    { return } // want "too many results"

// func literals
func _() {
	_ = func(_, _, _, _, _ int) {}         // OK
	_ = func(_, _, _, _, _, _ int) {}      // want "too many params"
	_ = func() (_, _, _ int) { return }    // OK
	_ = func() (_, _, _, _ int) { return } // want "too many results"
}

Install

You can get signature by go install command (Go 1.16 and higher).

$ go install github.com/gostaticanalysis/signature/cmd/signature@latest

How to use

signature run with go vet as below when Go is 1.12 and higher.

$ go vet -vettool=$(which signature) ./...

signature accepts two options -params and -results. -params specifies max number of parameters and -results specifies max number of results. The default value of -params is 5 and -results is 3.

$ go vet -vettool=$(which signature) -signature.params 3 -signature.results 4 ./...

Analyze with golang.org/x/tools/go/analysis

You can use signature.Analyzer with unitchecker.