[discord] nasty hack to register the application with the current runtime args

basically saves the whole argv string to reuse it on game launch

Not working due to:
https://github.com/discordapp/discord-rpc/issues/240
https://github.com/discordapp/discord-rpc/issues/163

discord/discord.c

@@ -227,12 +227,13 @@ void discord_init(void)
    handlers.spectateGame = handle_discord_spectate;
    handlers.joinRequest  = handle_discord_join_request;
 
-   /* To-Do: Add the arguments RetroArch was started with to the register URI*/
-   const char command[256] = "retroarch";
-
    Discord_Initialize(settings->arrays.discord_app_id, &handlers, 0, NULL);
-   Discord_Register(settings->arrays.discord_app_id, NULL);
 
+   char command[PATH_MAX_LENGTH];
+
+   strlcpy(command, _argv, sizeof(command));
+   RARCH_LOG("[Discord] registering startup command: %s\n", command);
+   Discord_Register(settings->arrays.discord_app_id, command);
    discord_ready         = true;
 }
 

retroarch.c

@@ -637,6 +637,16 @@ static void retroarch_parse_input_and_config(int argc, char *argv[])
    bool explicit_menu    = false;
    global_t  *global     = global_get_ptr();
 
+   /* Nasty hack to copy the args into a global so discord can register the same arguments for launch */
+   char buf[4096];
+   for (unsigned i = 0; i < argc; i++)
+   {
+      snprintf(buf, sizeof(buf), "%s %s", _argv, argv[i]);
+      strlcpy(_argv, buf, sizeof(_argv));
+   }
+   _argc = argc;
+   string_trim_whitespace_left(_argv);
+
    const struct option opts[] = {
 #ifdef HAVE_DYNAMIC
       { "libretro",           1, NULL, 'L' },

retroarch.h

@@ -305,6 +305,9 @@ typedef struct global
 #endif
 } global_t;
 
+unsigned _argc;
+char _argv[4096];
+
 bool rarch_ctl(enum rarch_ctl_state state, void *data);
 
 int retroarch_get_capabilities(enum rarch_capabilities type,