diff tests/test-mq-qdiff @ 9725:3f522d2fa633

diff: add --inverse option

Most of the time, one can reverse a diff by swapping the revisions passed with
-r but it happens that if you use the global -R, and diff against the tip of
the current repo, you can't swap the revisions. One use-case for that is
reviewing changes from a bundle before unbundling. One could also pipe the
output of `hg diff` to a command line filter that reverses the diff, but that
would remove the benefit from color diffs. Therefore, having an option in
`hg diff` to reverse a diff is a good thing.

The option flag selection was tricky. GNU patch uses -R/--reverse but -R is
already used as a global option and --reverse would make --rev ambiguous.

--- a/tests/test-mq-qdiff	Thu Nov 05 15:06:35 2009 +0100
+++ b/tests/test-mq-qdiff	Thu Nov 05 15:18:56 2009 +0100
@@ -55,5 +55,8 @@
 echo % qdiff -U 1 -B
 hg qdiff --nodates -U 1 -B
 
-echo qdiff -w
+echo % qdiff -w
 hg qdiff --nodates -w
+
+echo % qdiff --inverse
+hg qdiff --nodates --inverse