ios: If a .rafilter file has a single filter it is applied automatically.

ios/RetroArch/RADirectoryFilterList.m

@@ -16,23 +16,51 @@
    unsigned _filterCount;
 }
 
-- (id)initWithPath:(NSString*)path
++ (RADirectoryFilterList*) directoryFilterListAtPath:(NSString*)path useExpression:(NSRegularExpression**)regex
+{
+   if (regex)
+      *regex = nil;
+
+   if (path && ra_ios_is_file([path stringByAppendingPathComponent:@".rafilter"]))
+   {
+      config_file_t* configFile = config_file_new([[path stringByAppendingPathComponent:@".rafilter"] UTF8String]);
+      
+      unsigned filterCount = 0;
+      char* regexValue= 0;
+      
+      if (configFile && config_get_uint(configFile, "filter_count", &filterCount) && filterCount > 1)
+         return [[RADirectoryFilterList alloc] initWithPath:path config:configFile];
+      else if (regex && filterCount == 1 && config_get_string(configFile, "filter_1_regex", &regexValue))
+         *regex = [NSRegularExpression regularExpressionWithPattern:[NSString stringWithUTF8String:regexValue] options:0 error:nil];
+      
+      free(regexValue);
+   }
+
+   return nil;
+}
+
+- (id)initWithPath:(NSString*)path config:(config_file_t*)config
 {
    self = [super initWithStyle:UITableViewStylePlain];
-   
+
    _path = path;
-   _filterList = config_file_new([[path stringByAppendingPathComponent:@".rafilter"] UTF8String]);
-   
+   _filterList = config;
+
    if (!_filterList || !config_get_uint(_filterList, "filter_count", &_filterCount) || _filterCount == 0)
    {
       [RetroArch_iOS displayErrorMessage:@"No valid filters were found."];
    }
-   
+
    [self setTitle: [path lastPathComponent]];
-  
+   
    return self;
 }
 
+- (id)initWithPath:(NSString*)path
+{
+   return [self initWithPath:path config:config_file_new([[path stringByAppendingPathComponent:@".rafilter"] UTF8String])];
+}
+
 - (void)dealloc
 {
    if (_filterList)

ios/RetroArch/RADirectoryList.m

@@ -41,10 +41,10 @@ static NSString* check_path(NSString* path)
 {
    path = check_path(path);
    
-   if (path && ra_ios_is_file([path stringByAppendingPathComponent:@".rafilter"]))
-      return [[RADirectoryFilterList alloc] initWithPath:path];
-   else
-      return [RADirectoryList directoryListWithPath:path filter:nil];
+   NSRegularExpression* expr = nil;
+   RADirectoryFilterList* filterList = [RADirectoryFilterList directoryFilterListAtPath:path useExpression:&expr];
+
+   return filterList ? filterList : [RADirectoryList directoryListWithPath:path filter:expr];
 }
 
 + (id)directoryListWithPath:(NSString*)path filter:(NSRegularExpression*)regex

ios/RetroArch/browser.h

@@ -6,5 +6,9 @@ extern BOOL ra_ios_is_file(NSString* path);
 @end
 
 @interface RADirectoryFilterList : UITableViewController
+// Check path to see if a directory filter list is needed.
+// If one is not needed useExpression will be set to a default expression to use.
++ (RADirectoryFilterList*) directoryFilterListAtPath:(NSString*)path useExpression:(NSRegularExpression**)regex;
+
 - (id)initWithPath:(NSString*)path;
 @end