readline works even when ~/.mal-history does not exist

diff --git a/go/src/readline/readline.go b/go/src/readline/readline.go
index c3994a1..31c1fbb 100644 (file)
--- a/go/src/readline/readline.go
+++ b/go/src/readline/readline.go
@@ -8,6 +8,7 @@ package readline
 // free()
 #include <stdlib.h>
 // readline()
+#include <stdio.h> // FILE *
 #include <readline/readline.h>
 // add_history()
 #include <readline/history.h>
@@ -25,29 +26,32 @@ import (
 )
 
 var HISTORY_FILE = ".mal-history"
+var history_path string
 
-var rl_history_loaded = false
-
-func Readline(prompt string) (string, error) {
-       history_path := filepath.Join(os.Getenv("HOME"), "/", HISTORY_FILE)
-
-       if !rl_history_loaded {
-               rl_history_loaded = true
-               content, e := ioutil.ReadFile(history_path)
-               if e != nil {
-                       return "", e
-               }
+func loadHistory(filename string) error {
+       content, err := ioutil.ReadFile(history_path)
+       if err != nil {
+               return err
+       }
 
-               for _, add_line := range strings.Split(string(content), "\n") {
-                       if add_line == "" {
-                               continue
-                       }
-                       c_add_line := C.CString(add_line)
-                       C.add_history(c_add_line)
-                       C.free(unsafe.Pointer(c_add_line))
+       for _, add_line := range strings.Split(string(content), "\n") {
+               if add_line == "" {
+                       continue
                }
+               c_add_line := C.CString(add_line)
+               C.add_history(c_add_line)
+               C.free(unsafe.Pointer(c_add_line))
        }
 
+       return nil
+}
+
+func init() {
+       history_path = filepath.Join(os.Getenv("HOME"), HISTORY_FILE)
+       loadHistory(history_path)
+}
+
+func Readline(prompt string) (string, error) {
        c_prompt := C.CString(prompt)
        defer C.free(unsafe.Pointer(c_prompt))