# HG changeset patch
# User Sushil khanchi <sushilkhanchi97@gmail.com>
# Date 1550777571 -19800
# Node ID b2a8e67b093362c7e1008a9f8d6530a645eb0696
# Parent  29733c2b0fd31eecc677e6e90706eef18c08cca1
evolve: handle a case in pubic-div when merging results in same as public

In public divergence resolution, what we do is:
1) first apply content divergence resolution
2) then phase divergent resolution on resultant node of 1) case

While doing case 1 it is possible that result of merging the two csets
would have same changes as public one contains. And then processing
the case 2 would create an empty commit which is not something we want
to do.
So this patch catch that same case when merging results in same as public
cset and don't create a new node, instead to solve the divergence
it just add a obsmarker from "other divergent" to "public divergent"
i.e. [other, (public,)]

Next patch will add the continue case handling for this same case.

This patch also adds the tests for the different cases which are possible
for the above mentioned case.
There is test for continue case too which is broken in this patch
and will be fixed in next patch.

diff -r 29733c2b0fd3 -r b2a8e67b0933 hgext3rd/evolve/evolvecmd.py
--- a/hgext3rd/evolve/evolvecmd.py	Thu Feb 28 02:08:58 2019 +0530
+++ b/hgext3rd/evolve/evolvecmd.py	Fri Feb 22 01:02:51 2019 +0530
@@ -516,8 +516,11 @@
         # divergent with that same public cset.
         # here newnode is phase divergent, lets resolve this divergence.
         if not res:
+            # resolution was not successful, return
             return (res, newnode)
-
+        if newnode == publicdiv.node():
+            # no changes were found that are different from public cset
+            return (res, newnode)
         prec = publicdiv
         bumped = repo[newnode]
         return _resolvephasedivergent(ui, repo, prec=prec, bumped=bumped,
@@ -570,6 +573,19 @@
         haspubdiv = True
         publicnode = evolvestate['public-divergent']
         publicdiv = repo[publicnode]
+        othernode = evolvestate['other-divergent']
+        otherdiv = repo[othernode]
+
+        with repo.dirstate.parentchange():
+            repo.dirstate.setparents(publicnode, nodemod.nullid)
+            dirstatedance(repo, divergent, publicnode, None)
+        # check if node to be committed has changes same as public one
+        s = publicdiv.status()
+        if not (s.added or s.removed or s.deleted or s.modified):
+            # no changes, create markers to resolve divergence
+            obsolete.createmarkers(repo, [(otherdiv, (publicdiv,))],
+                                   operation='evolve')
+            return (True, publicnode)
     try:
         with repo.dirstate.parentchange():
             repo.dirstate.setparents(resparent, nodemod.nullid)
diff -r 29733c2b0fd3 -r b2a8e67b0933 tests/test-evolve-public-content-divergent.t
--- a/tests/test-evolve-public-content-divergent.t	Thu Feb 28 02:08:58 2019 +0530
+++ b/tests/test-evolve-public-content-divergent.t	Fri Feb 22 01:02:51 2019 +0530
@@ -698,3 +698,307 @@
 
   $ hg evolve -l
   $ cd ..
+
+
+Testing the case when "merging results in same as public cset" where:
+both the csets are on same parent and no conflict in merging.
+---------------------------------------------------------------------
+
+Prepare the repo:
+
+  $ hg init pubdiv5
+  $ cd pubdiv5
+  $ for ch in a b c; do
+  >   echo $ch > $ch;
+  >   hg ci -Am "added "$ch;
+  > done;
+  adding a
+  adding b
+  adding c
+
+  $ hg up .^
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ echo ch > ch
+  $ hg add ch
+  $ hg ci -m "added ch"
+  created new head
+
+  $ hg up .^
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ echo ch > ch
+  $ hg add ch
+  $ hg ci -m "added c"
+  created new head
+
+  $ hg glog
+  @  4:f7c1071f1e7c added c
+  |   draft
+  |
+  | o  3:90522bccf499 added ch
+  |/    draft
+  |
+  | o  2:155349b645be added c
+  |/    draft
+  |
+  o  1:5f6d8a4bf34a added b
+  |   draft
+  |
+  o  0:9092f1db7931 added a
+      draft
+  
+
+  $ hg prune 2 -s 3
+  1 changesets pruned
+  $ hg prune 2 -s 4 --hidden
+  1 changesets pruned
+  2 new content-divergent changesets
+  $ hg phase --public -r 4
+
+  $ hg glog
+  @  4:f7c1071f1e7c added c
+  |   public
+  |
+  | *  3:90522bccf499 added ch
+  |/    draft content-divergent
+  |
+  o  1:5f6d8a4bf34a added b
+  |   public
+  |
+  o  0:9092f1db7931 added a
+      public
+  
+  $ hg evolve --content-divergent --any
+  merge:[4] added c
+  with: [3] added ch
+  base: [2] added c
+  merging "other" content-divergent changeset '90522bccf499'
+  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
+
+  $ hg evolve -l
+
+  $ hg par
+  changeset:   4:f7c1071f1e7c
+  tag:         tip
+  parent:      1:5f6d8a4bf34a
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     added c
+  
+
+Testing the case when "merging results in same as public cset" where:
+both the csets are on different parent and no conflict in merging and relocation.
+---------------------------------------------------------------------------------
+
+Prepare the repo:
+
+  $ cd ..
+  $ hg init pubdiv6
+  $ cd pubdiv6
+  $ for ch in a b c d; do
+  >   echo $ch > $ch;
+  >   hg ci -Am "added "$ch;
+  > done;
+  adding a
+  adding b
+  adding c
+  adding d
+
+  $ hg up 1
+  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
+  $ echo dh > dh
+  $ hg add dh
+  $ hg ci -m "added dh"
+  created new head
+
+  $ hg up 2
+  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ echo dh > dh
+  $ hg add dh
+  $ hg ci -m "added d"
+  created new head
+
+  $ hg glog
+  @  5:e800202333a4 added d
+  |   draft
+  |
+  | o  4:5acd58ef5066 added dh
+  | |   draft
+  | |
+  +---o  3:9150fe93bec6 added d
+  | |     draft
+  | |
+  o |  2:155349b645be added c
+  |/    draft
+  |
+  o  1:5f6d8a4bf34a added b
+  |   draft
+  |
+  o  0:9092f1db7931 added a
+      draft
+  
+
+  $ hg prune 3 -s 4
+  1 changesets pruned
+  $ hg prune 3 -s 5 --hidden
+  1 changesets pruned
+  2 new content-divergent changesets
+  $ hg phase --public -r 5
+
+  $ hg glog
+  @  5:e800202333a4 added d
+  |   public
+  |
+  | *  4:5acd58ef5066 added dh
+  | |   draft content-divergent
+  | |
+  o |  2:155349b645be added c
+  |/    public
+  |
+  o  1:5f6d8a4bf34a added b
+  |   public
+  |
+  o  0:9092f1db7931 added a
+      public
+  
+  $ hg evolve --content-divergent --any
+  merge:[5] added d
+  with: [4] added dh
+  base: [3] added d
+  rebasing "other" content-divergent changeset 5acd58ef5066 on 155349b645be
+  updating to "local" side of the conflict: e800202333a4
+  merging "other" content-divergent changeset 'ae3429430ef1'
+  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
+
+  $ hg evolve -l
+
+  $ hg par
+  changeset:   5:e800202333a4
+  tag:         tip
+  parent:      2:155349b645be
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     added d
+  
+Testing the case when "merging results in same as public cset" where:
+both the csets are on same parent and merging leads to conflict.
+---------------------------------------------------------------------
+
+Prepare the repo:
+
+  $ cd ..
+  $ hg init pubdiv7
+  $ cd pubdiv7
+  $ for ch in a b c; do
+  >   echo $ch > $ch;
+  >   hg ci -Am "added "$ch;
+  > done;
+  adding a
+  adding b
+  adding c
+
+  $ hg up .^
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ echo chconflict > ch
+  $ hg add ch
+  $ hg ci -m "added ch"
+  created new head
+
+  $ hg up .^
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ echo ch > ch
+  $ hg add ch
+  $ hg ci -m "added c"
+  created new head
+
+  $ hg glog
+  @  4:f7c1071f1e7c added c
+  |   draft
+  |
+  | o  3:229da2719b19 added ch
+  |/    draft
+  |
+  | o  2:155349b645be added c
+  |/    draft
+  |
+  o  1:5f6d8a4bf34a added b
+  |   draft
+  |
+  o  0:9092f1db7931 added a
+      draft
+  
+
+  $ hg prune 2 -s 3
+  1 changesets pruned
+  $ hg prune 2 -s 4 --hidden
+  1 changesets pruned
+  2 new content-divergent changesets
+  $ hg phase --public -r 4
+
+  $ hg glog
+  @  4:f7c1071f1e7c added c
+  |   public
+  |
+  | *  3:229da2719b19 added ch
+  |/    draft content-divergent
+  |
+  o  1:5f6d8a4bf34a added b
+  |   public
+  |
+  o  0:9092f1db7931 added a
+      public
+  
+  $ hg evolve --content-divergent --any
+  merge:[4] added c
+  with: [3] added ch
+  base: [2] added c
+  merging "other" content-divergent changeset '229da2719b19'
+  merging ch
+  warning: conflicts while merging ch! (edit, then use 'hg resolve --mark')
+  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
+  fix conflicts and see `hg help evolve.interrupted`
+  [1]
+
+  $ hg diff
+  diff -r f7c1071f1e7c ch
+  --- a/ch	Thu Jan 01 00:00:00 1970 +0000
+  +++ b/ch	Thu Jan 01 00:00:00 1970 +0000
+  @@ -1,1 +1,5 @@
+  +<<<<<<< local: f7c1071f1e7c - test: added c
+   ch
+  +=======
+  +chconflict
+  +>>>>>>> other: 229da2719b19 - test: added ch
+
+  $ echo ch > ch
+  $ hg res -m
+  (no more unresolved files)
+  continue: hg evolve --continue
+
+  $ hg evolve --continue
+  computing new diff
+  transaction abort!
+  rollback completed
+  abort: cannot obsolete public changeset: f7c1071f1e7c
+  (see 'hg help phases' for details)
+  [255]
+
+  $ hg evolve -l
+  229da2719b19: added ch
+    content-divergent: f7c1071f1e7c (public) (precursor 155349b645be)
+  
+
+  $ hg par
+  changeset:   4:f7c1071f1e7c
+  tag:         tip
+  parent:      1:5f6d8a4bf34a
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     added c
+  
+  changeset:   3:229da2719b19
+  parent:      1:5f6d8a4bf34a
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  instability: content-divergent
+  summary:     added ch
+