package main import ( "log" "os" "github.com/FooSoft/zero-epwing-go/zig" ) func main() { book, err := zig.Load(os.Args[1]) if err != nil { log.Fatal(err) } fp, err := os.Create(os.Args[2]) defer fp.Close() for _, subbook := range book.Subbooks { for _, entry := range subbook.Entries { fp.WriteString(entry.Heading) fp.WriteString("\n") } } }