Fix: Handle default prompt when stdout is redirected (mandiant#938)

* when stdout is redirected, use default prompt values

floss/main.py

@@ -606,7 +606,11 @@ def main(argv=None) -> int:
 
     if results.metadata.language not in ("", "unknown"):
         if args.enabled_types == [] and args.disabled_types == []:
-            prompt = input("Do you want to enable string deobfuscation? (this could take a long time) [y/N] ")
+            # when stdout is redirected, such as in 'floss foo.exe | less' use default prompt values
+            if sys.stdout.isatty():
+                prompt = input("Do you want to enable string deobfuscation? (this could take a long time) [y/N] ")
+            else:
+                prompt = "n"
 
             if prompt.lower() == "y":
                 logger.info("enabled string deobfuscation")