subcmds: force consistent help text format

We're inconsistent with help text as to whether it uses title case and
whether it ends in a period.  Add a test to enforce a standard, and use
the style that Python optparse & argparse use themselves (e.g. with the
--help option): always lowercase, and never trailing period.

Change-Id: Ic1defae23daeac0ac9116aaf487427f50b34050d
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/305144
Reviewed-by: Raman Tenneti <rtenneti@google.com>
Tested-by: Mike Frysinger <vapier@google.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/subcmds/diffmanifests.py b/subcmds/diffmanifests.py
index 392e5972..6f23b345 100644
--- a/subcmds/diffmanifests.py
+++ b/subcmds/diffmanifests.py
@@ -68,10 +68,10 @@ synced and their revisions won't be found.
   def _Options(self, p):
     p.add_option('--raw',
                  dest='raw', action='store_true',
-                 help='Display raw diff.')
+                 help='display raw diff')
     p.add_option('--no-color',
                  dest='color', action='store_false', default=True,
-                 help='does not display the diff in color.')
+                 help='does not display the diff in color')
     p.add_option('--pretty-format',
                  dest='pretty_format', action='store',
                  metavar='<FORMAT>',