Use utf-8 on Windows

chsrc.c

@@ -107,7 +107,7 @@ static const char const
   pl_ruby, pl_python, pl_nodejs, pl_perl,  pl_php,    pl_cran,
   pl_rust, pl_go,     pl_dotnet, pl_maven, pl_gradle, pl_julia
 };
-#undef arg
+#undef cmdfunc
 
 static const char const*
 usage[] = {
@@ -145,6 +145,8 @@ print_help ()
 int
 main (int argc, char const *argv[])
 {
+  xy_useutf8();
+
   // 未提供参数时
   if (argc<=1) {
     print_help(); return 0;

helper.h

@@ -12,6 +12,13 @@
 #include <string.h>
 #include <stdlib.h>
 
+#ifdef _WIN32
+  #include <windows.h>
+  #define xy_useutf8() SetConsoleOutputCP(65001)
+#else
+  #define xy_useutf8()
+#endif
+
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
 
 char*