goquickfix

The goquickfix command quickly fixes Go source that is well typed but Go refuses to compile e.g. declared and not used: x.

Installation

go install github.com/motemen/go-quickfix/cmd/goquickfix@latest

Usage

goquickfix [-w] [-revert] <path>...

Flags:
  -revert: try to revert possible quickfixes introduced by goquickfix
  -w: write result to (source) file instead of stdout

Description

While coding, you may write a Go program that is completely well typed but go build (or run or test) refuses to build, like this:

package main

import (
	"fmt"
	"log"
)

func main() {
	nums := []int{3, 1, 4, 1, 5}
	for i, n := range nums {
		fmt.Println(n)
	}
}

The Go compiler will complain:

main.go:5:2: "log" imported and not used
main.go:10:6: declared and not used: i

Do we have to bother to comment out the import line or remove the unused identifier one by one for the Go compiler? Of course no, goquickfix does the work instead of you.

Run

goquickfix -w main.go

and you will get the source rewritten so that Go compiles it well without changing the semantics:

package main

import (
	"fmt"
	_ "log"
)

func main() {
	nums := []int{3, 1, 4, 1, 5}
	for i, n := range nums {
		fmt.Println(n)
		_ = i
	}
}

Now, you can go run or go test your code successfully.