func parsePackageImport()

in mockgen/mockgen.go [667:701]

• 32 lines of code
• 9 McCabe index (conditional complexity)

func parsePackageImport(srcDir string) (string, error) {
	moduleMode := os.Getenv("GO111MODULE")
	// trying to find the module
	if moduleMode != "off" {
		currentDir := srcDir
		for {
			dat, err := ioutil.ReadFile(filepath.Join(currentDir, "go.mod"))
			if os.IsNotExist(err) {
				if currentDir == filepath.Dir(currentDir) {
					// at the root
					break
				}
				currentDir = filepath.Dir(currentDir)
				continue
			} else if err != nil {
				return "", err
			}
			modulePath := modfile.ModulePath(dat)
			return filepath.ToSlash(filepath.Join(modulePath, strings.TrimPrefix(srcDir, currentDir))), nil
		}
	}
	// fall back to GOPATH mode
	goPaths := os.Getenv("GOPATH")
	if goPaths == "" {
		return "", fmt.Errorf("GOPATH is not set")
	}
	goPathList := strings.Split(goPaths, string(os.PathListSeparator))
	for _, goPath := range goPathList {
		sourceRoot := filepath.Join(goPath, "src") + string(os.PathSeparator)
		if strings.HasPrefix(srcDir, sourceRoot) {
			return filepath.ToSlash(strings.TrimPrefix(srcDir, sourceRoot)), nil
		}
	}
	return "", errOutsideGoPath
}