Readline repl for linux & osx

1 files changed, 55 insertions, 0 deletions

diff --git a/ethereum/repl_darwin.go b/ethereum/repl_darwin.go
new file mode 100644
index 000000000..b6de190e4
--- /dev/null
+++ b/ethereum/repl_darwin.go
@@ -0,0 +1,55 @@
+package main
+
+// #cgo LDFLAGS: -lreadline
+// #include <stdio.h>
+// #include <stdlib.h>
+// #include <readline/readline.h>
+// #include <readline/history.h>
+import "C"
+import "unsafe"
+
+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))
+}
+
+func (self *JSRepl) read() {
+	prompt := "eth >>> "
+
+L:
+	for {
+		switch result := readLine(&prompt); true {
+		case result == nil:
+			break L //exit loop
+
+		case *result != "": //ignore blank lines
+			addHistory(*result) //allow user to recall this line
+
+			self.parseInput(*result)
+		}
+	}
+}