Add option to specify the order for printed messages

As mentioned in the previous commit, this change makes it possible to
select the first or last N matches in conjunction with the -l flag.

1 files changed, 7 insertions, 0 deletions

diff --git a/quarg/actions.py b/quarg/actions.py
index 70cde03..6aadc3d 100644
--- a/quarg/actions.py
+++ b/quarg/actions.py
@@ -45,6 +45,13 @@ class ParseDate(argparse.Action):
     def __call__(self, parser, namespace, datespec, option_string=None):
         setattr(namespace, self.dest, parse_isodate(datespec))
 
+class ParseOrder(argparse.Action):
+    def __call__(self, parser, namespace, orderspec, option_string=None):
+        if orderspec not in ['asc', 'desc']:
+            errx(f'Invalid order \'{orderspec}\'. Possible values are: asc, desc')
+
+        setattr(namespace, self.dest, orderspec)
+
 class ParseAround(argparse.Action):
     def __call__(self, parser, namespace, aroundspec, option_string=None):
         if '/' in aroundspec: