Add c-based localization support

internal/i18n/i18n.go

@@ -0,0 +1,38 @@
+package i18n
+
+/*
+#include <locale.h>
+#include <stdlib.h>
+#include <libintl.h>
+
+static void init_i18n(const char* domain, const char* localedir) {
+	setlocale(LC_ALL, "");
+	bindtextdomain(domain, localedir);
+	bind_textdomain_codeset(domain, "UTF-8");
+	textdomain(domain);
+}
+*/
+import "C"
+
+import (
+	"log"
+	"unsafe"
+)
+
+func Init(domain, localeDir string) {
+	cDomain := C.CString(domain)
+	defer C.free(unsafe.Pointer(cDomain))
+
+	cDir := C.CString(localeDir)
+	defer C.free(unsafe.Pointer(cDir))
+
+	log.Println("initialize localization for domain", domain, "with directory", localeDir)
+	C.init_i18n(cDomain, cDir)
+}
+
+func T(msgid string) string {
+	c := C.CString(msgid)
+	defer C.free(unsafe.Pointer(c))
+
+	return C.GoString(C.gettext(c))
+}