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package ethrepl
// #cgo darwin CFLAGS: -I/usr/local/opt/readline/include
// #cgo darwin LDFLAGS: -L/usr/local/opt/readline/lib
// #cgo LDFLAGS: -lreadline
// #include <stdio.h>
// #include <stdlib.h>
// #include <readline/readline.h>
// #include <readline/history.h>
import "C"
import (
"fmt"
"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 {
val, err := method.Call(method, v)
if err == nil {
fmt.Printf("%v", val)
}
}
}
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