macosx/StringUtility: add helper to format time strings

modules/gui/macosx/StringUtility.h

@@ -48,6 +48,7 @@ unsigned int CocoaKeyToVLC(unichar i_key);
 - (NSString *)localizedString:(const char *)psz;
 - (NSString *)wrapString: (NSString *)o_in_string toWidth: (int)i_width;
 - (NSString *)getCurrentTimeAsString:(input_thread_t *)p_input negative:(BOOL)b_negative;
+- (NSString *)stringForTime:(long long int)time;
 
 - (NSString *)OSXStringKeyToString:(NSString *)theString;
 - (NSString *)VLCKeyToString:(NSString *)theString;

modules/gui/macosx/StringUtility.m

@@ -133,6 +133,27 @@ static VLCStringUtility *_o_sharedInstance = nil;
         return [NSString stringWithUTF8String:secstotimestr(psz_time, (time.i_time / 1000000))];
 }
 
+- (NSString *)stringForTime:(long long int)time
+{
+    if (time > 0) {
+        long long positiveDuration = llabs(time);
+        if (positiveDuration > 3600)
+            return [NSString stringWithFormat:@"%s%01ld:%02ld:%02ld",
+                    time < 0 ? "-" : "",
+                    (long) (positiveDuration / 3600),
+                    (long)((positiveDuration / 60) % 60),
+                    (long) (positiveDuration % 60)];
+        else
+            return [NSString stringWithFormat:@"%s%02ld:%02ld",
+                    time < 0 ? "-" : "",
+                    (long)((positiveDuration / 60) % 60),
+                    (long) (positiveDuration % 60)];
+    } else {
+        // Return a string that represents an undefined time.
+        return @"--:--";
+    }
+}
+
 #pragma mark -
 #pragma mark Key Shortcuts