$ cat >> $HGRCPATH <<EOF
  > [extensions]
  > EOF
  $ echo "evolve=$(echo $(dirname $TESTDIR))/hgext3rd/evolve/" >> $HGRCPATH

  $ glog() {
  >   hg log -G --template '{rev}@{branch}({phase}) {desc|firstline}\n' "$@"
  > }

  $ hg init repo --traceback
  $ cd repo
  $ echo a > a
  $ hg ci -Am adda
  adding a

Test that amend captures branches

  $ hg branch foo
  marked working directory as branch foo
  (branches are permanent and global, did you want a bookmark?)
  $ hg amend -d '0 0' -n "this a note on the obsmarker and supported for hg>=4.4"
  $ hg debugobsolete
  07f4944404050f47db2e5c5071e0e84e7a27bba9 6a022cbb61d5ba0f03f98ff2d36319dfea1034ae 0 (*) {'ef1': '*', 'user': 'test'} (glob)
  $ hg obslog
  @  6a022cbb61d5 (1) adda
  |
  x  07f494440405 (0) adda
       rewritten(branch) as 6a022cbb61d5 using amend by test (Thu Jan 01 00:00:00 1970 +0000)
         note: this a note on the obsmarker and supported for hg>=4.4
  
  $ hg branch
  foo
  $ hg branches
  foo                            1:6a022cbb61d5
  $ glog
  @  1@foo(draft) adda
  
Test no-op

  $ hg amend -d '0 0'
  nothing changed
  [1]
  $ glog
  @  1@foo(draft) adda
  

Test forcing the message to the same value, no intermediate revision.

  $ hg amend -d '0 0' -m 'adda'
  nothing changed
  [1]
  $ glog
  @  1@foo(draft) adda
  

Test collapsing into an existing revision, no intermediate revision.

  $ echo a >> a
  $ hg ci -m changea
  $ echo a > a
  $ hg status
  M a
  $ hg pstatus
  $ hg diff
  diff -r f7a50201fe3a a
  --- a/a	Thu Jan 01 00:00:00 1970 +0000
  +++ b/a	* +0000 (glob)
  @@ -1,2 +1,1 @@
   a
  -a
  $ hg pdiff
  $ hg ci -m reseta
  $ hg debugobsolete
  07f4944404050f47db2e5c5071e0e84e7a27bba9 6a022cbb61d5ba0f03f98ff2d36319dfea1034ae 0 (*) {'ef1': '*', 'user': 'test'} (glob)
  $ hg phase 2
  2: draft
  $ glog
  @  3@foo(draft) reseta
  |
  o  2@foo(draft) changea
  |
  o  1@foo(draft) adda
  
Specify precise commit date with -d
  $ hg amend -d '2001-02-03 04:05:06 +0700'
  $ hg parents --template '{rev}  {date|date}\n'
  4  Sat Feb 03 04:05:06 2001 +0700

Specify "now" as commit date with -D
  $ before=`date +%s`
  $ hg amend -D
  $ commit=`hg parents --template '{date|hgdate} rev{rev}\n'`
  $ after=`date +%s`
  $ (echo $before ; echo $commit; echo $after) | sort -k1 -n -s
  \d+ (re)
  \d+ 0 rev5 (re)
  \d+ (re)

Specify current user as committer with -U
  $ HGUSER=newbie hg amend -U
  $ hg parents --template '{rev}  {author}\n'
  6  newbie

Check that --logfile works
  $ echo "logfile message" > logfile.txt
  $ hg amend -l logfile.txt
  $ hg log -r . -T "{desc}\n"
  logfile message

# Make sure we don't get reparented to -1 with no username (issue4211)
  $ HGUSER=
  $ hg amend -e --config ui.username= -m "empty user"
  abort: no username supplied
  (use 'hg config --edit' to set your username)
  [255]
  $ hg sum
  parent: 7:* tip (glob)
   logfile message
  branch: foo
  commit: 1 unknown (clean)
  update: (current)
  phases: 3 draft

setting the user after we have performed the test with no username
  $ HGUSER=test

Check the help
  $ hg amend -h
  hg amend [OPTION]... [FILE]...
  
  aliases: refresh
  
  combine a changeset with updates and replace it with a new one
  
      Commits a new changeset incorporating both the changes to the given files
      and all the changes from the current parent changeset into the repository.
  
      See 'hg commit' for details about committing changes.
  
      If you don't specify -m, the parent's message will be reused.
  
      If --extract is specified, the behavior of 'hg amend' is reversed: Changes
      to selected files in the checked out revision appear again as uncommitted
      changed in the working directory.
  
      Returns 0 on success, 1 if nothing changed.
  
  options ([+] can be repeated):
  
   -A --addremove           mark new/missing files as added/removed before
                            committing
   -a --all                 match all files
   -e --edit                invoke editor on commit messages
      --extract             extract changes from the commit to the working copy
      --patch               make changes to wdir parent by editing patch
      --close-branch        mark a branch as closed, hiding it from the branch
                            list
   -s --secret              use the secret phase for committing
   -n --note TEXT           store a note on amend
   -I --include PATTERN [+] include names matching the given patterns
   -X --exclude PATTERN [+] exclude names matching the given patterns
   -m --message TEXT        use text as commit message
   -l --logfile FILE        read commit message from file
   -d --date DATE           record the specified date as commit date
   -u --user USER           record the specified user as committer
   -D --current-date        record the current date as commit date
   -U --current-user        record the current user as committer
   -i --interactive         use interactive mode
  
  (some details hidden, use --verbose to show complete help)

Check that we abort if --patch and --extract both are used at once
  $ hg amend --patch --extract
  abort: cannot use both --patch and --extract
  [255]

  $ cd ..

Check the pre-check logic for content-divergence
  $ hg init precheckrepo
  $ cd precheckrepo
  $ echo a > a
  $ hg ci -Am "added a"
  adding a
  $ echo newchanges > a
  $ hg amend
  $ hg up 0 --hidden -q
  updated to hidden changeset 9092f1db7931
  (hidden revision '9092f1db7931' was rewritten as: aafaf407b00d)
  working directory parent is obsolete! (9092f1db7931)

when rewritting an already rewritten changeset (i.e cset being rewritten will
be the base of divergence)
  $ hg amend -m "i am gonna create divergence"
  abort: amend of 9092f1db7931 creates content-divergence with aafaf407b00d
  (add --verbose for details or see 'hg help evolution.instability')
  [255]
  $ hg amend -m "i am gonna create divergence" --verbose
  abort: amend of 9092f1db7931 creates content-divergence with aafaf407b00d
      changeset 9092f1db7931 already have a successors as changeset aafaf407b00d
      rewriting changeset 9092f1db7931 would create "content-divergence"
      set experimental.evolution.allowdivergence=True to overwrite this check
  (see 'hg help evolution.instability' for details on content-divergence)
  [255]

when rewritting a cset which has a predecessor with non-obsolete successor

to prepare the repo
1) create content-divergence
2) remove divergence by pruning one of the divergent cset
  $ echo edited_a > a
  $ hg ci -m "edited a"
  1 new orphan changesets
  $ hg debugobsolete $(hg id -ir 0 --debug) $(hg id -ir 2 --debug)
  1 new obsolescence markers
  2 new content-divergent changesets

remove divergence by pruning one side of divergenence
  $ hg debugobsolete $(hg id -ir 2 --debug)
  1 new obsolescence markers
  obsoleted 1 changesets

  $ hg evolve -l
  $ hg amend -m "i am gonna create divergence"
  abort: amend of f8c05838af90 creates content-divergence with aafaf407b00d, from 9092f1db7931
  (add --verbose for details or see 'hg help evolution.instability')
  [255]
  $ hg amend -m "i am gonna create divergence" --verbose
  abort: amend of f8c05838af90 creates content-divergence with aafaf407b00d, from 9092f1db7931
      changeset f8c05838af90 is an evolution of changeset 9092f1db7931
      changeset 9092f1db7931 already have a successors as changeset aafaf407b00d
      rewriting changeset f8c05838af90 would create "content-divergence"
      set experimental.evolution.allowdivergence=True to overwrite this check
  (see 'hg help evolution.instability' for details on content-divergence)
  [255]