constantcheck

constantcheck is a golang analyzer for checking the possibility of replacing the literals used in the code with constants from already imported packages.

Installation

go get -u github.com/AntonBraer/constantcheck@latest

Usage

./constantcheck ./...

Examples

Let's say we have a project structure like this:

├── helps
│   ├── helps.go
├──main.go

package main

import (
	"fmt"

	"example/helps"
)

func main() {
	if err := helps.Ping(); err != nil{
		fmt.Println("myImportantError")	
    }
}

package helps

import (
	"fmt"
)

const CustomError = "myImportantError"

func Ping() error{
	fmt.Println("Pong")
	return nil
}

After checking the linter, we should get an error that we can use a constant from helps package with name CustomError

I couldn't show it in tests because there is some problem with imports in testing. But the linter parses ALL imported packages of the file, not just standard ones