Tolerate inability to write settings file.

It's questionable that the unsolicited write of the settings is
reasonable at all, but at the very least it shouldn't crash if it
can't, e.g., when outputting to /dev/null for testing.

TESTED:
Now prints message and continues on failed attempt to write
/dev/null.settings.  Writes settings successfully with real
output file specified.

diff --git a/getmyancestors.py b/getmyancestors.py
index 28f84e6496aa084fbf434f2522767b2c021e10ba..f0a57a14a14b5c171ca0a400adb38bacfaaaabed 100755 (executable)
--- a/getmyancestors.py
+++ b/getmyancestors.py
@@ -1189,12 +1189,17 @@ def main():
             return str(getattr(value, "name", value))
 
         formatting = "{:74}{:\t>1}\n"
-        with open(args.outfile.name.split(".")[0] + ".settings", "w") as settings_file:
-            settings_file.write(formatting.format("time stamp: ", time.strftime("%X %x %Z")))
-            for action in parser._actions:
-                settings_file.write(
-                    formatting.format(action.option_strings[-1], parse_action(action))
-                )
+        settings_name = args.outfile.name.split(".")[0] + ".settings"
+        try:
+            with open(settings_name, "w") as settings_file:
+                settings_file.write(formatting.format("time stamp: ", time.strftime("%X %x %Z")))
+                for action in parser._actions:
+                    settings_file.write(
+                        formatting.format(action.option_strings[-1], parse_action(action))
+                    )
+        except OSError as exc:
+            print("Unable to write %s: %s" % (settings_name, repr(exc)),
+                  file=sys.stderr)
 
     # initialize a FamilySearch session and a family tree object
     print("Login to FamilySearch...")