package main // #cgo darwin CFLAGS: -I/usr/local/opt/readline/include // #cgo darwin LDFLAGS: -L/usr/local/opt/readline/lib // #cgo LDFLAGS: -lreadline // #include // #include // #include // #include import "C" import ( "os" "os/signal" "strings" "syscall" "unsafe" ) func initReadLine() { C.rl_catch_sigwinch = 0 C.rl_catch_signals = 0 c := make(chan os.Signal, 1) signal.Notify(c, syscall.SIGWINCH) signal.Notify(c, os.Interrupt) go func() { for sig := range c { switch sig { case syscall.SIGWINCH: C.rl_resize_terminal() case os.Interrupt: C.rl_cleanup_after_signal() default: } } }() } func readLine(prompt *string) *string { var p *C.char //readline allows an empty prompt(NULL) if prompt != nil { p = C.CString(*prompt) } ret := C.readline(p) if p != nil { C.free(unsafe.Pointer(p)) } if ret == nil { return nil } //EOF s := C.GoString(ret) C.free(unsafe.Pointer(ret)) return &s } func addHistory(s string) { p := C.CString(s) C.add_history(p) C.free(unsafe.Pointer(p)) } var indentCount = 0 var str = "" func (self *JSRepl) setIndent() { open := strings.Count(str, "{") open += strings.Count(str, "(") closed := strings.Count(str, "}") closed += strings.Count(str, ")") indentCount = open - closed if indentCount <= 0 { self.prompt = "> " } else { self.prompt = strings.Join(make([]string, indentCount*2), "..") self.prompt += " " } } func (self *JSRepl) read() { initReadLine() L: for { switch result := readLine(&self.prompt); true { case result == nil: break L case *result != "": str += *result + "\n" self.setIndent() if indentCount <= 0 { if *result == "exit" { self.Stop() break L } hist := str[:len(str)-1] addHistory(hist) //allow user to recall this line self.history.WriteString(str) self.parseInput(str) str = "" } } } } func (self *JSRepl) PrintValue(v interface{}) { method, _ := self.re.vm.Get("prettyPrint") v, err := self.re.vm.ToValue(v) if err == nil { method.Call(method, v) } }