Don't require a game on startup

cli.c

@@ -2,10 +2,15 @@
 #include <stdio.h>
 
 int parseCLIArgs(int argc, char **argv, CLIArgs *args) {
-    if (argc != 2) {
-        fprintf(stderr, "usage: %s /path/to/rom.vb\n", argv[0]);
-        return 1;
+    int arg;
+
+    args->filename = NULL;
+    for (arg = 1; arg < argc; ++arg) {
+        if (args->filename) {
+            fprintf(stderr, "usage: %s /path/to/rom.vb\n", argv[0]);
+            return 1;
+        }
+        args->filename = argv[arg];
     }
-    args->filename = argv[1];
     return 0;
 }

main.c

@@ -1,5 +1,6 @@
 #include "cli.h"
 #include <SDL2/SDL.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include "ui.h"
 
@@ -7,6 +8,7 @@ int main(int argc, char **argv) {
     CLIArgs args;
     UIContext *ui;
     int status;
+    bool running = false;
 
     if (parseCLIArgs(argc, argv, &args)) {
         return 1;
@@ -25,10 +27,13 @@ int main(int argc, char **argv) {
     }
 
     if (args.filename) {
-        uiLoadGame(ui, args.filename);
+        if (uiLoadGame(ui, args.filename)) {
+            return 1;
+        }
+        running = true;
     }
 
-    status = uiRun(ui);
+    status = uiRun(ui, running);
     uiDestroy(ui);
     SDL_Quit();
     return status;

ui.c

@@ -105,10 +105,10 @@ typedef enum status_t {
     status_running
 } status_t;
 
-int uiRun(UIContext *ui) {
+int uiRun(UIContext *ui, bool running) {
     static uint8_t leftEye[384*224];
     static uint8_t rightEye[384*224];
-    status_t status = status_running;
+    status_t status = running ? status_running : status_paused;
 
     while (1) {
         struct nk_context *ctx;

ui.h

@@ -1,11 +1,13 @@
 #ifndef SHROOMS_VB_NATIVE_UI_
 #define SHROOMS_VB_NATIVE_UI_
 
+#include <stdbool.h>
+
 typedef struct UIContext UIContext;
 
 UIContext *uiInit();
 void uiDestroy(UIContext *ui);
 int uiLoadGame(UIContext *ui, const char *path);
-int uiRun(UIContext *ui);
+int uiRun(UIContext *ui, bool running);
 
 #endif