diff tests/test-mq-qdiff.out @ 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.out	Thu Nov 05 15:06:35 2009 +0100
+++ b/tests/test-mq-qdiff.out	Thu Nov 05 15:18:56 2009 +0100
@@ -76,7 +76,7 @@
 +hello  world
 +     goodbye world
  7
-qdiff -w
+% qdiff -w
 diff -r 35fb829491c1 lines
 --- a/lines
 +++ b/lines
@@ -86,3 +86,21 @@
  1
  2
  3
+% qdiff --inverse
+diff -r 35fb829491c1 lines
+--- a/lines
++++ b/lines
+@@ -1,11 +1,9 @@
+-
+-
+ 1
+ 2
+ 3
+ 4
+-hello  world
+-     goodbye world
++hello world
++goodbye world
+ 7
+ 8
+ 9