# HG changeset patch
# User Mike Miller <mtmiller@octave.org>
# Date 1582011432 28800
# Node ID 8565d950a3ca0b9251fee0069582e93cfcfb34f3
# Parent  739045a86cfdd84490c8dbec402f272d0bb82a0f
allow history_timestamp_format_string to be empty (bug #57843)

* oct-hist.cc (history_system::timestamp_format_string): Allow value to be
empty.  Add tests.


diff -r 739045a86cfd -r 8565d950a3ca libinterp/corefcn/oct-hist.cc
--- a/libinterp/corefcn/oct-hist.cc	Sun Feb 16 21:08:35 2020 -0500
+++ b/libinterp/corefcn/oct-hist.cc	Mon Feb 17 23:37:12 2020 -0800
@@ -312,7 +312,7 @@
                                            int nargout)
   {
     return set_internal_variable (m_timestamp_format_string, args, nargout,
-                                  "timestamp_format_string", false);
+                                  "timestamp_format_string");
   }
 
   // Display, save, or load history.  Stolen and modified from bash.
@@ -884,6 +884,15 @@
   return history_sys.timestamp_format_string (args, nargout);
 }
 
+/*
+%!test
+%! history_timestamp_format_string ("# Example history marker", "local");
+%! assert (history_timestamp_format_string (), "# Example history marker")
+%!test <*57843>
+%! history_timestamp_format_string ("", "local");
+%! assert (history_timestamp_format_string (), "")
+*/
+
 DEFUN (history_save, args, nargout,
        doc: /* -*- texinfo -*-
 @deftypefn  {} {@var{val} =} history_save ()