[PATCH] revert: always display hunks reversed when reverting to parent

[Denis Laxalde]

# HG changeset patch
# User Denis Laxalde <denis.laxalde at logilab.fr>
# Date 1488805881 -3600
#      Mon Mar 06 14:11:21 2017 +0100
# Node ID 9f2b436197b02608e1546f57ac6426ec1427c7fd
# Parent  b4cd912d7704cd976e1bee3a3c927e0e578ec88f
# Available At http://hg.logilab.org/users/dlaxalde/hg
#              hg pull http://hg.logilab.org/users/dlaxalde/hg -r 9f2b436197b0
revert: always display hunks reversed when reverting to parent

When reverting to the parent of working directory, operation is "discard" so
we want hunks to be presented in the same order as the diff (i.e. "reversed").
So we do not query the experimental.revertalternateinteractivemode option in
this case and always set "reversehunks" to True.

diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -3258,15 +3258,18 @@ def _performrevert(repo, parents, ctx, a
         diffopts = patch.difffeatureopts(repo.ui, whitespace=True)
         diffopts.nodates = True
         diffopts.git = True
-        reversehunks = repo.ui.configbool('experimental',
-                                          'revertalternateinteractivemode',
-                                          True)
+        operation = 'discard'
+        reversehunks = True
+        if node != parent:
+            operation = 'revert'
+            reversehunks = repo.ui.configbool('experimental',
+                                              'revertalternateinteractivemode',
+                                              True)
         if reversehunks:
             diff = patch.diff(repo, ctx.node(), None, m, opts=diffopts)
         else:
             diff = patch.diff(repo, None, ctx.node(), m, opts=diffopts)
         originalchunks = patch.parsepatch(diff)
-        operation = 'discard' if node == parent else 'revert'
 
         try:
 
diff --git a/tests/test-revert-interactive.t b/tests/test-revert-interactive.t
--- a/tests/test-revert-interactive.t
+++ b/tests/test-revert-interactive.t
@@ -380,29 +380,29 @@ Check the experimental config to invert 
   3 hunks, 3 lines changed
   examine changes to 'folder1/g'? [Ynesfdaq?] y
   
-  @@ -1,5 +1,4 @@
-  -firstline
+  @@ -1,4 +1,5 @@
+  +firstline
    c
    1
    2
    3
   discard change 1/3 to 'folder1/g'? [Ynesfdaq?] y
   
-  @@ -2,7 +1,7 @@
+  @@ -1,7 +2,7 @@
    c
    1
    2
    3
-  - 3
-  +4
+  -4
+  + 3
    5
    d
   discard change 2/3 to 'folder1/g'? [Ynesfdaq?] y
   
-  @@ -7,3 +6,2 @@
+  @@ -6,2 +7,3 @@
    5
    d
-  -lastline
+  +lastline
   discard change 3/3 to 'folder1/g'? [Ynesfdaq?] n
   
   $ hg diff --nodates