return func(f *ast.File) bool {
		if imports(f, path) {
			deleteImport(f, path)
			return true
		}
		return false
	}
}

func addDelImportFn(p1 string, p2 string) func(*ast.File) bool {
	return func(f *ast.File) bool {
		fixed := false
		if !imports(f, p1) {
			addImport(f, p1)
			fixed = true
		}
		if imports(f, p2) {
			deleteImport(f, p2)
			fixed = true
		}
		return fixed
	}
}

	// This logic is taken from golang.org/x/tools/imports package.
	return strings.Contains(importPath, ".")
}

// DeleteImport deletes the import path from the file f, if present.
// If there are duplicate import declarations, all matching ones are deleted.
func DeleteImport(fset *token.FileSet, f *ast.File, path string) (deleted bool) {
	return DeleteNamedImport(fset, f, "", path)
}

		newImport.Path.ValuePos = prev.Pos()
		newImport.EndPos = prev.Pos()
	}

	f.Imports = append(f.Imports, newImport)
	return true
}

// deleteImport deletes the import path from the file f, if present.
func deleteImport(f *ast.File, path string) (deleted bool) {
	oldImport := importSpec(f, path)

	// Find the import node that imports path, if any.
	for i, decl := range f.Decls {