specify path to diablo.ini (#928)

Source/diablo.cpp

@@ -113,6 +113,7 @@ static void print_help_and_exit()
 	printf("    %-20s %-30s\n", "--version", "Print the version and exit");
 	printf("    %-20s %-30s\n", "--data-dir", "Specify the folder of diabdat.mpq");
 	printf("    %-20s %-30s\n", "--save-dir", "Specify the folder of save files");
+	printf("    %-20s %-30s\n", "--config-dir", "Specify the location of diablo.ini");
 	printf("    %-20s %-30s\n", "-n", "Skip startup videos");
 	printf("    %-20s %-30s\n", "-f", "Display frames per second");
 	printf("    %-20s %-30s\n", "-x", "Run in windowed mode");
@@ -156,6 +157,8 @@ static void diablo_parse_flags(int argc, char **argv)
 			SetBasePath(argv[++i]);
 		} else if (strcasecmp("--save-dir", argv[i]) == 0) {
 			SetPrefPath(argv[++i]);
+		} else if (strcasecmp("--config-dir", argv[i]) == 0) {
+			SetConfigPath(argv[++i]);
 		} else if (strcasecmp("-n", argv[i]) == 0) {
 			showintrodebug = FALSE;
 		} else if (strcasecmp("-f", argv[i]) == 0) {

SourceS/paths.cpp

@@ -12,6 +12,7 @@ namespace {
 
 std::string *basePath = NULL;
 std::string *prefPath = NULL;
+std::string *configPath = NULL;
 
 void AddTrailingSlash(std::string *path) {
 #ifdef _WIN32
@@ -48,6 +49,13 @@ const std::string &GetPrefPath()
 	return *prefPath;
 }
 
+const std::string &GetConfigPath()
+{
+	if (configPath == NULL)
+		configPath = FromSDL(SDL_GetPrefPath("diasurgical", "devilution"));
+	return *configPath;
+}
+
 void SetBasePath(const char *path)
 {
 	if (basePath == NULL) basePath = new std::string;
@@ -62,4 +70,12 @@ void SetPrefPath(const char *path)
 	AddTrailingSlash(prefPath);
 }
 
+void SetConfigPath(const char *path)
+{
+	if (configPath == NULL)
+		configPath = new std::string;
+	*configPath = path;
+	AddTrailingSlash(configPath);
+}
+
 } // namespace dvl

SourceS/paths.h

@@ -6,8 +6,10 @@ namespace dvl {
 
 const std::string &GetBasePath();
 const std::string &GetPrefPath();
+const std::string &GetConfigPath();
 
 void SetBasePath(const char *path);
 void SetPrefPath(const char *path);
+void SetConfigPath(const char *path);
 
 } // namespace dvl

SourceX/storm/storm.cpp

@@ -35,7 +35,7 @@ static bool IsSVidVideoMode = false;
 #endif
 
 radon::File& getIni() {
-  static radon::File ini(GetPrefPath() + "diablo.ini");
+  static radon::File ini(GetConfigPath() + "diablo.ini");
   return ini;
 }