errifscope

README

errifscope

errifscope is linter to find if block that can encapsulate the scope of error variable.

By confining the scope of error to if, it is possible to reduce reassignment to err and avoid creating variables such as err1 and err2.

Installation

go install github.com/otakakot/errifscope/cmd/errifscope@latest

Usage

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

Examples

package main

func f() error {
	return nil
}

func main() {
	err := f()
	if err != nil {
		return
	}
}

Running errifscope on the above code will produce the following output:

./main.go:9:2: can be scoped with if block

You can be rewritten as:

package main

func f() error {
	return nil
}

func main() {
	if err := f(); err != nil {
		return
	}
}

Documentation

Index

• Variables

Variables

var Analyzer = &analysis.Analyzer{
	Name: "errifscope",
	Doc:  "errifscope is linter to find if block that can encapsulate the scope of error variable.",
	Run:  run,
	Requires: []*analysis.Analyzer{
		inspect.Analyzer,
	},
}