view tests/test-topic-stack.t @ 6634:991cbf0f66f2

evolve: drop unused dagutil.py

This file had some issues detected by pytype, and when I went to check what the
problem was, this file turned out to be completely unused.

It was used previously for obsdiscovery, but since 77f3699e711e it's unused.

  $ . "$TESTDIR/testlib/topic_setup.sh"

Initial setup


  $ cat << EOF >> $HGRCPATH
  > [ui]
  > logtemplate = {rev} {branch} \{{get(namespaces, "topics")}} {phase} {desc|firstline}\n
  > [experimental]
  > evolution=all
  > EOF

  $ hg init main
  $ cd main
  $ hg topic other
  marked working directory as topic: other
  $ echo aaa > aaa
  $ hg add aaa
  $ hg commit -m c_a
  active topic 'other' grew its first changeset
  (see 'hg help topics' for more information)
  $ echo aaa > bbb
  $ hg add bbb
  $ hg commit -m c_b
  $ hg topic foo
  $ echo aaa > ccc
  $ hg add ccc
  $ hg commit -m c_c
  active topic 'foo' grew its first changeset
  (see 'hg help topics' for more information)
  $ echo aaa > ddd
  $ hg add ddd
  $ hg commit -m c_d
  $ echo aaa > eee
  $ hg add eee
  $ hg commit -m c_e
  $ echo aaa > fff
  $ hg add fff
  $ hg commit -m c_f
  $ hg log -G
  @  5 default {foo} draft c_f
  |
  o  4 default {foo} draft c_e
  |
  o  3 default {foo} draft c_d
  |
  o  2 default {foo} draft c_c
  |
  o  1 default {other} draft c_b
  |
  o  0 default {other} draft c_a
  

Check that topic without any parent does not crash --list
---------------------------------------------------------

  $ hg up other
  switching to topic other
  0 files updated, 0 files merged, 4 files removed, 0 files unresolved
  $ hg topic --list
  ### topic: other
  ### target: default (branch)
  s2@ c_b (current)
  s1: c_a
  $ hg phase --public 'topic("other")'
  active topic 'other' is now empty
  (use 'hg topic --clear' to clear it if needed)

After changing the phase of all the changesets in "other" to public, the topic should still be active, but is empty. We should be better at informing the user about it and displaying good data in this case.

  $ hg topic
     foo   (4 changesets)
   * other (0 changesets)
  $ hg stack
  ### topic: other
  ### target: default (branch)
  (stack is empty)
  s0^ c_b (base current)

  $ hg up foo
  switching to topic foo
  4 files updated, 0 files merged, 0 files removed, 0 files unresolved

Simple test
-----------

'hg stack' list all changeset in the topic

  $ hg topic
   * foo (4 changesets)
  $ hg stack
  ### topic: foo
  ### target: default (branch)
  s4@ c_f (current)
  s3: c_e
  s2: c_d
  s1: c_c
  s0^ c_b (base)
  $ hg stack -v
  ### topic: foo
  ### target: default (branch)
  s4(6559e6d93aea)@ c_f (current)
  s3(0f9ac936c87d): c_e
  s2(e629654d7050): c_d
  s1(8522f9e3fee9): c_c
  s0(ea705abc4f51)^ c_b (base)
  $ hg stack -Tjson | "$PYTHON" -m json.tool
  [
      {
          "desc": "c_f",
          "isentry": true,
          "node": "6559e6d93aeadba940874f54f106c61931b5b8cf",
          "stack_index": 4,
          "state": [
              "current"
          ],
          "symbol": "@"
      },
      {
          "desc": "c_e",
          "isentry": true,
          "node": "0f9ac936c87d1d991011862aff4e86d0c3300a89",
          "stack_index": 3,
          "state": [
              "clean"
          ],
          "symbol": ":"
      },
      {
          "desc": "c_d",
          "isentry": true,
          "node": "e629654d70505107cca3d12782d9c5a50d8fb9c8",
          "stack_index": 2,
          "state": [
              "clean"
          ],
          "symbol": ":"
      },
      {
          "desc": "c_c",
          "isentry": true,
          "node": "8522f9e3fee92d4ec4e688ac3fbd2ee0f8fd5036",
          "stack_index": 1,
          "state": [
              "clean"
          ],
          "symbol": ":"
      },
      {
          "desc": "c_b",
          "isentry": false,
          "node": "ea705abc4f51e26d356ed94b3443e8c19b76cedf",
          "stack_index": 0,
          "state": [
              "base"
          ],
          "symbol": "^"
      }
  ]
  $ hg stack -v -Tjson | "$PYTHON" -m json.tool
  [
      {
          "desc": "c_f",
          "isentry": true,
          "node": "6559e6d93aeadba940874f54f106c61931b5b8cf",
          "stack_index": 4,
          "state": [
              "current"
          ],
          "symbol": "@"
      },
      {
          "desc": "c_e",
          "isentry": true,
          "node": "0f9ac936c87d1d991011862aff4e86d0c3300a89",
          "stack_index": 3,
          "state": [
              "clean"
          ],
          "symbol": ":"
      },
      {
          "desc": "c_d",
          "isentry": true,
          "node": "e629654d70505107cca3d12782d9c5a50d8fb9c8",
          "stack_index": 2,
          "state": [
              "clean"
          ],
          "symbol": ":"
      },
      {
          "desc": "c_c",
          "isentry": true,
          "node": "8522f9e3fee92d4ec4e688ac3fbd2ee0f8fd5036",
          "stack_index": 1,
          "state": [
              "clean"
          ],
          "symbol": ":"
      },
      {
          "desc": "c_b",
          "isentry": false,
          "node": "ea705abc4f51e26d356ed94b3443e8c19b76cedf",
          "stack_index": 0,
          "state": [
              "base"
          ],
          "symbol": "^"
      }
  ]

  $ hg stack -T '{rev}: [{branch}] [{topic}] {desc}\n'
  5: [default] [foo] c_f
  4: [default] [foo] c_e
  3: [default] [foo] c_d
  2: [default] [foo] c_c
  1: [default] [] c_b

check that topics and stack are available even if ui.strict=true

  $ hg topics
   * foo (4 changesets)
  $ hg stack
  ### topic: foo
  ### target: default (branch)
  s4@ c_f (current)
  s3: c_e
  s2: c_d
  s1: c_c
  s0^ c_b (base)
  $ hg topics --config ui.strict=true
   * foo (4 changesets)
  $ hg stack --config ui.strict=true
  ### topic: foo
  ### target: default (branch)
  s4@ c_f (current)
  s3: c_e
  s2: c_d
  s1: c_c
  s0^ c_b (base)

merge case (displaying info about external)
-------------------------------------------

  $ hg up default
  0 files updated, 0 files merged, 4 files removed, 0 files unresolved
  $ hg topics zzz
  marked working directory as topic: zzz
  $ echo zzz > zzz
  $ hg add zzz
  $ hg commit -m zzz_a
  active topic 'zzz' grew its first changeset
  (see 'hg help topics' for more information)
  $ hg merge foo
  4 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg commit -m "merged foo"

stack -m display data about child

  $ hg stack foo
  ### topic: foo
  ### target: default (branch)
  s4: c_f
  s3: c_e
  s2: c_d
  s1: c_c
  s0^ c_b (base)

  $ hg stack foo --children
  ### topic: foo
  ### target: default (branch)
  s4: c_f (external-children)
  s3: c_e
  s2: c_d
  s1: c_c
  s0^ c_b (base)

error case, nothing to list

  $ hg strip --config extensions.strip= t1 --no-backup
  0 files updated, 0 files merged, 5 files removed, 0 files unresolved

  $ hg up foo
  switching to topic foo
  4 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ hg topic --clear
  $ hg stack
  ### target: default (branch)
  (stack is empty)
  s0^ c_f (base current)

Test "t#" reference
-------------------


  $ hg up s2
  abort: cannot resolve "s2": branch "default" has only 0 non-public changesets
  [255]
  $ hg topic foo
  marked working directory as topic: foo
  $ hg up t42
  abort: cannot resolve "t42": topic "foo" has only 4 changesets
  [255]
  $ hg up s42
  abort: cannot resolve "s42": topic "foo" has only 4 changesets
  [255]
  $ hg up s2
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ hg summary
  parent: 3:e629654d7050 
   c_d
  branch: default//foo
  commit: (clean)
  update: 2 new changesets (update)
  phases: 4 draft
  topic:  foo

Case with some of the topic unstable
------------------------------------

  $ echo bbb > ddd
  $ hg commit --amend
  2 new orphan changesets
  $ hg log -G
  @  6 default {foo} draft c_d
  |
  | *  5 default {foo} draft c_f
  | |
  | *  4 default {foo} draft c_e
  | |
  | x  3 default {foo} draft c_d
  |/
  o  2 default {foo} draft c_c
  |
  o  1 default {} public c_b
  |
  o  0 default {} public c_a
  
  $ hg topic --list
  ### topic: foo
  ### target: default (branch)
  s4$ c_f (orphan)
  s3$ c_e (orphan)
  s2@ c_d (current)
  s1: c_c
  s0^ c_b (base)
  $ hg up s3
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg topic --list
  ### topic: foo
  ### target: default (branch)
  s4$ c_f (orphan)
  s3@ c_e (current orphan)
  s2: c_d
  s1: c_c
  s0^ c_b (base)
  $ hg topic --list --color=debug
  [stack.summary.topic|### topic: [topic.active|foo]]
  [stack.summary.branches|### target: default (branch)]
  [stack.index stack.index.orphan|s4][stack.state stack.state.orphan|$] [stack.desc stack.desc.orphan|c_f][stack.state stack.state.orphan| (orphan)]
  [stack.index stack.index.current stack.index.orphan|s3][stack.state stack.state.current stack.state.orphan|@] [stack.desc stack.desc.current stack.desc.orphan|c_e][stack.state stack.state.current stack.state.orphan| (current orphan)]
  [stack.index stack.index.clean|s2][stack.state stack.state.clean|:] [stack.desc stack.desc.clean|c_d]
  [stack.index stack.index.clean|s1][stack.state stack.state.clean|:] [stack.desc stack.desc.clean|c_c]
  [stack.index stack.index.base|s0][stack.state stack.state.base|^] [stack.desc stack.desc.base|c_b][stack.state stack.state.base| (base)]
  $ hg up s2
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved

Also test the revset:

  $ hg log -r 'stack()'
  2 default {foo} draft c_c
  6 default {foo} draft c_d
  4 default {foo} draft c_e
  5 default {foo} draft c_f

  $ hg log -r 'stack(foo)'
  hg: parse error: stack takes no arguments, it works on current topic
  [10]

  $ hg log -r 'stack(foobar)'
  hg: parse error: stack takes no arguments, it works on current topic
  [10]

Stack relation:

  $ hg log -r 'foo#stack'
  2 default {foo} draft c_c
  4 default {foo} draft c_e
  5 default {foo} draft c_f
  6 default {foo} draft c_d

Stack relation subscript:

  $ hg log -r 'foo#stack[0]'
  1 default {} public c_b
  $ hg log -r 's0 and foo#stack[0]'
  1 default {} public c_b
  $ hg log -r 'foo#stack[4]'
  5 default {foo} draft c_f
  $ hg log -r 's4 and foo#stack[4]'
  5 default {foo} draft c_f

Case with multiple heads on the topic
-------------------------------------

Make things linear again

  $ hg rebase -s 'desc(c_e)' -d 'desc(c_d) - obsolete()'
  rebasing 4:0f9ac936c87d foo "c_e"
  rebasing 5:6559e6d93aea foo "c_f"
  $ hg log -G
  o  8 default {foo} draft c_f
  |
  o  7 default {foo} draft c_e
  |
  @  6 default {foo} draft c_d
  |
  o  2 default {foo} draft c_c
  |
  o  1 default {} public c_b
  |
  o  0 default {} public c_a
  


Create the second branch

  $ hg up 'desc(c_d)'
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo aaa > ggg
  $ hg add ggg
  $ hg commit -m c_g
  $ echo aaa > hhh
  $ hg add hhh
  $ hg commit -m c_h
  $ hg log -G
  @  10 default {foo} draft c_h
  |
  o  9 default {foo} draft c_g
  |
  | o  8 default {foo} draft c_f
  | |
  | o  7 default {foo} draft c_e
  |/
  o  6 default {foo} draft c_d
  |
  o  2 default {foo} draft c_c
  |
  o  1 default {} public c_b
  |
  o  0 default {} public c_a
  

Test output

  $ hg top -l
  ### topic: foo (2 heads)
  ### target: default (branch)
  s6@ c_h (current)
  s5: c_g
  s2^ c_d (base)
  s4: c_f
  s3: c_e
  s2: c_d
  s1: c_c
  s0^ c_b (base)

Case with multiple heads on the topic with instability involved
---------------------------------------------------------------

We amend the message to make sure the display base picks the right changeset

  $ hg up 'desc(c_d)'
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ echo ccc > ddd
  $ hg commit --amend -m 'c_D' 
  4 new orphan changesets
  $ hg rebase -d . -s 'desc(c_g)'
  rebasing 9:81264ae8a36a foo "c_g"
  rebasing 10:fde5f5941642 foo "c_h"
  $ hg log -G
  o  13 default {foo} draft c_h
  |
  o  12 default {foo} draft c_g
  |
  @  11 default {foo} draft c_D
  |
  | *  8 default {foo} draft c_f
  | |
  | *  7 default {foo} draft c_e
  | |
  | x  6 default {foo} draft c_d
  |/
  o  2 default {foo} draft c_c
  |
  o  1 default {} public c_b
  |
  o  0 default {} public c_a
  

  $ hg topic --list
  ### topic: foo (2 heads)
  ### target: default (branch)
  s6: c_h
  s5: c_g
  s2^ c_D (base current)
  s4$ c_f (orphan)
  s3$ c_e (orphan)
  s2@ c_D (current)
  s1: c_c
  s0^ c_b (base)

Trying to list non existing topic
  $ hg stack thisdoesnotexist
  abort: cannot resolve "thisdoesnotexist": no such topic found
  [255]
  $ hg topic --list thisdoesnotexist
  abort: cannot resolve "thisdoesnotexist": no such topic found
  [255]

Complex cases where commits with same topic are not consecutive but are linear
==============================================================================

  $ hg log --graph
  o  13 default {foo} draft c_h
  |
  o  12 default {foo} draft c_g
  |
  @  11 default {foo} draft c_D
  |
  | *  8 default {foo} draft c_f
  | |
  | *  7 default {foo} draft c_e
  | |
  | x  6 default {foo} draft c_d
  |/
  o  2 default {foo} draft c_c
  |
  o  1 default {} public c_b
  |
  o  0 default {} public c_a
  
Converting into a linear chain
  $ hg rebase -s 'desc("c_e") - obsolete()' -d 'desc("c_h") - obsolete()'
  rebasing 7:215bc359096a foo "c_e"
  rebasing 8:ec9267b3f33f foo "c_f"

  $ hg log -G
  o  15 default {foo} draft c_f
  |
  o  14 default {foo} draft c_e
  |
  o  13 default {foo} draft c_h
  |
  o  12 default {foo} draft c_g
  |
  @  11 default {foo} draft c_D
  |
  o  2 default {foo} draft c_c
  |
  o  1 default {} public c_b
  |
  o  0 default {} public c_a
  
Changing topics on some commits in between
  $ hg topic foobar -r 'desc(c_e) + desc(c_D)'
  switching to topic foobar
  4 new orphan changesets
  changed topic on 2 changesets to "foobar"
  $ hg log -G
  @  17 default {foobar} draft c_D
  |
  | *  16 default {foobar} draft c_e
  | |
  | | *  15 default {foo} draft c_f
  | | |
  | | x  14 default {foo} draft c_e
  | |/
  | *  13 default {foo} draft c_h
  | |
  | *  12 default {foo} draft c_g
  | |
  | x  11 default {foo} draft c_D
  |/
  o  2 default {foo} draft c_c
  |
  o  1 default {} public c_b
  |
  o  0 default {} public c_a
  
  $ hg rebase -s 'desc("c_f") - obsolete()' -d 'desc("c_e") - obsolete()'
  rebasing 15:77082e55de88 foo "c_f"
  switching to topic foo
  1 new orphan changesets
  switching to topic foobar
  $ hg rebase -s 'desc("c_g") - obsolete()' -d 'desc("c_D") - obsolete()'
  rebasing 12:0c3e8aed985d foo "c_g"
  switching to topic foo
  rebasing 13:b9e4f3709bc5 foo "c_h"
  rebasing 16:4bc813530301 foobar "c_e"
  switching to topic foobar
  rebasing 18:4406ea4be852 tip foo "c_f"
  switching to topic foo
  switching to topic foobar
  $ hg up
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg log --graph
  o  22 default {foo} draft c_f
  |
  @  21 default {foobar} draft c_e
  |
  o  20 default {foo} draft c_h
  |
  o  19 default {foo} draft c_g
  |
  o  17 default {foobar} draft c_D
  |
  o  2 default {foo} draft c_c
  |
  o  1 default {} public c_b
  |
  o  0 default {} public c_a
  
  $ hg log -r 'desc("c_D")' -T '{rev}: {join(extras, " ")}\n'
  17: _rewrite_noise=[0-9a-f]+ amend_source=[0-9a-f]+ branch=default topic=foobar (re)

XXX: The following should show single heads
XXX: The behind count is weird, because the topic are interleaved.

  $ hg stack
  ### topic: foobar
  ### target: default (branch), 3 behind
  s2@ c_e (current)
    ^ c_h
  s1: c_D
  s0^ c_c (base)

  $ hg stack -v
  ### topic: foobar
  ### target: default (branch), 3 behind
  s2(5985c9f0df93)@ c_e (current)
                  ^ c_h
  s1(cab9d344b7b5): c_D
  s0(8522f9e3fee9)^ c_c (base)

  $ hg stack --debug
  ### topic: foobar
  ### target: default (branch), 3 behind
  s2(5985c9f0df9331630a4f003f01d320303b8dcae1)@ c_e (current)
                                              ^ c_h
  s1(cab9d344b7b582ae7c125f0eae77c18c771c508d): c_D
  s0(8522f9e3fee92d4ec4e688ac3fbd2ee0f8fd5036)^ c_c (base)

  $ hg stack foo
  ### topic: foo
  ### target: default (branch), ambiguous rebase destination - topic 'foo' has 3 heads
  s4: c_f
    ^ c_e
  s3: c_h
  s2: c_g
    ^ c_D
  s1: c_c
  s0^ c_b (base)

case involving a merge
----------------------

  $ cd ..
  $ hg init stack-gap-merge
  $ cd stack-gap-merge

  $ echo aaa > aaa
  $ hg commit -Am 'c_A'
  adding aaa
  $ hg debug-topic-namespace my-tns
  marked working directory as topic namespace: my-tns
  $ hg topic red
  marked working directory as topic: red
  $ echo bbb > bbb
  $ hg commit -Am 'c_B'
  adding bbb
  active topic 'red' grew its first changeset
  (see 'hg help topics' for more information)
  $ echo ccc > ccc
  $ hg commit -Am 'c_C'
  adding ccc
  $ hg topic blue
  $ echo ddd > ddd
  $ hg commit -Am 'c_D'
  adding ddd
  active topic 'blue' grew its first changeset
  (see 'hg help topics' for more information)
  $ hg up 'desc("c_B")'
  switching to topic red
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ echo eee > eee
  $ hg commit -Am 'c_E'
  adding eee
  $ echo fff > fff
  $ hg commit -Am 'c_F'
  adding fff
  $ hg topic blue
  $ echo ggg > ggg
  $ hg commit -Am 'c_G'
  adding ggg
  $ hg up 'desc("c_D")'
  2 files updated, 0 files merged, 3 files removed, 0 files unresolved
  $ hg topic red
  $ hg merge 'desc("c_G")'
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg commit -Am 'c_H'
  $ hg topic blue
  $ echo iii > iii
  $ hg ci -Am 'c_I'
  adding iii

  $ hg log -G
  @  8 default {blue} draft c_I
  |
  o    7 default {red} draft c_H
  |\
  | o  6 default {blue} draft c_G
  | |
  | o  5 default {red} draft c_F
  | |
  | o  4 default {red} draft c_E
  | |
  o |  3 default {blue} draft c_D
  | |
  o |  2 default {red} draft c_C
  |/
  o  1 default {red} draft c_B
  |
  o  0 default {} draft c_A
  

  $ hg stack red
  ### topic: red
  ### target: default (branch), 6 behind
  s5: c_H
    ^ c_G
    ^ c_D
  s4: c_C
  s1^ c_B (base)
  s3: c_F
  s2: c_E
  s1: c_B
  s0^ c_A (base)
  $ hg stack blue
  ### topic: blue
  ### target: default (branch), ambiguous rebase destination - topic 'blue' has 3 heads
  s3@ c_I (current)
    ^ c_H
  s2: c_D
    ^ c_C
  s1: c_G
  s0^ c_F (base)

Even with some obsolete and orphan changesets

(the ordering of each branch of "blue" change because their hash change. we
should stabilize this eventually)

  $ hg up 'desc("c_B")'
  switching to topic red
  0 files updated, 0 files merged, 6 files removed, 0 files unresolved
  $ hg commit --amend --user test2
  7 new orphan changesets
  $ hg up 'desc("c_C")'
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg commit --amend --user test2
  $ hg up 'desc("c_D")'
  switching to topic blue
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg commit --amend --user test2

  $ hg log -G --rev 'sort(all(), "topo")'
  @  11 default {blue} draft c_D
  |
  | *  8 default {blue} draft c_I
  | |
  | *    7 default {red} draft c_H
  | |\
  | | *  6 default {blue} draft c_G
  | | |
  | | *  5 default {red} draft c_F
  | | |
  | | *  4 default {red} draft c_E
  | | |
  | x |  3 default {blue} draft c_D
  |/ /
  x /  2 default {red} draft c_C
  |/
  | *  10 default {red} draft c_C
  |/
  x  1 default {red} draft c_B
  |
  | o  9 default {red} draft c_B
  |/
  o  0 default {} draft c_A
  

  $ hg stack red
  ### topic: red
  ### target: default (branch), 7 behind
  s5$ c_H (orphan)
    ^ c_G
    ^ c_D
  s4$ c_C (orphan)
  s1^ c_B (base)
  s3$ c_F (orphan)
  s2$ c_E (orphan)
  s1: c_B
  s0^ c_A (base)
  $ hg stack blue
  ### topic: blue
  ### target: default (branch), ambiguous rebase destination - topic 'blue' has 3 heads
  s3$ c_I (orphan)
    ^ c_H
  s2$ c_G (orphan)
    ^ c_F
  s1@ c_D (current orphan)
  s0^ c_C (base orphan)

more obsolescence

  $ hg up 'max(desc("c_H"))'
  switching to topic red
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg commit --amend --user test3
  $ hg up 'max(desc("c_G"))'
  switching to topic blue
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ hg commit --amend --user test3
  $ hg up 'max(desc("c_B"))'
  switching to topic red
  0 files updated, 0 files merged, 3 files removed, 0 files unresolved
  $ hg commit --amend --user test3
  $ hg up 'max(desc("c_C"))'
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg commit --amend --user test3
  $ hg up 'max(desc("c_D"))'
  switching to topic blue
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg commit --amend --user test3

  $ hg log -G --rev 'sort(all(), "topo")'
  @  16 default {blue} draft c_D
  |
  | *  13 default {blue} draft c_G
  | |
  | | *    12 default {red} draft c_H
  | | |\
  | | | | *  8 default {blue} draft c_I
  | | | | |
  | | +---x  7 default {red} draft c_H
  | | | |/
  | +---x  6 default {blue} draft c_G
  | | |
  | * |  5 default {red} draft c_F
  | | |
  | * |  4 default {red} draft c_E
  | | |
  +---x  3 default {blue} draft c_D
  | |
  x |  2 default {red} draft c_C
  |/
  | *  15 default {red} draft c_C
  |/
  x  1 default {red} draft c_B
  |
  | o  14 default {red} draft c_B
  |/
  o  0 default {} draft c_A
  

  $ hg stack red
  ### topic: red
  ### target: default (branch), 7 behind
  s5$ c_H (orphan)
    ^ c_G
    ^ c_D
  s4$ c_F (orphan)
  s3$ c_E (orphan)
  s1^ c_B (base)
  s2$ c_C (orphan)
  s1: c_B
  s0^ c_A (base)
  $ hg stack blue
  ### topic: blue
  ### target: default (branch), ambiguous rebase destination - topic 'blue' has 3 heads
  s3$ c_I (orphan)
    ^ c_H
  s2$ c_G (orphan)
    ^ c_F
  s1@ c_D (current orphan)
  s0^ c_C (base orphan)

Test stack behavior with a split
--------------------------------

get things linear again

  $ hg rebase -r s1 -d default
  rebasing 16:c9b07601c2f4 tip blue "c_D"
  switching to topic-namespace my-tns
  switching to topic blue
  $ hg rebase -r s2 -d s1
  rebasing 13:90c34d9f99aa blue "c_G"
  $ hg rebase -r s3 -d s2
  rebasing 8:77174443ad61 blue "c_I"
  $ hg stack
  ### topic: blue
  ### target: default (branch)
  s3: c_I
  s2: c_G
  s1@ c_D (current)
  s0^ c_A (base)

making a split
(first get something to split)

  $ hg up s2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg status --change .
  A ggg
  $ echo zzz > Z
  $ hg add Z
  $ hg commit --amend
  1 new orphan changesets
  $ hg status --change .
  A Z
  A ggg
  $ hg stack
  ### topic: blue
  ### target: default (branch)
  s3$ c_I (orphan)
  s2@ c_G (current)
  s1: c_D
  s0^ c_A (base)
  $ hg --config extensions.evolve=  --config ui.interactive=yes split << EOF
  > y
  > y
  > n
  > c
  > EOF
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  adding Z
  adding ggg
  diff --git a/Z b/Z
  new file mode 100644
  examine changes to 'Z'?
  (enter ? for help) [Ynesfdaq?] y
  
  @@ -0,0 +1,1 @@
  +zzz
  record change 1/2 to 'Z'?
  (enter ? for help) [Ynesfdaq?] y
  
  diff --git a/ggg b/ggg
  new file mode 100644
  examine changes to 'ggg'?
  (enter ? for help) [Ynesfdaq?] n
  
  continue splitting? [Ycdq?] c

  $ hg debugobsolete
  8da160be12a0d8d40b5aad42aea02123e255f802 6646bdc8cb87942886d4b8548bc243aaacf94b61 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '16', 'operation': 'amend', 'user': 'test'}
  2dc043b3e268bc3d7f30fc2319a72f4430af1d31 6044ea1ba1f7e573bc33312518cd005c45e2ad7d 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '16', 'operation': 'amend', 'user': 'test'}
  d2c0265139080fe437d3550f5a6c975bc5c3f545 03ec02fb9548883827e62560d0b1e786851f4536 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '16', 'operation': 'amend', 'user': 'test'}
  97cd99629af4d20fc3ccb0989d36294a85dd026d 17318610d72be0981692fb3f02ef1bf30191367e 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '16', 'operation': 'amend', 'user': 'test'}
  78da2467366f01b547bd1fc39bcfcc5917be7caa 90c34d9f99aafcc26de07beb0b3c85856de0fa46 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '16', 'operation': 'amend', 'user': 'test'}
  6646bdc8cb87942886d4b8548bc243aaacf94b61 3603891aa2fe38371f226d956f39252576155fba 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '16', 'operation': 'amend', 'user': 'test'}
  6044ea1ba1f7e573bc33312518cd005c45e2ad7d 0a3ac1989f8bde7725203cba7a812e547af916fc 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '16', 'operation': 'amend', 'user': 'test'}
  03ec02fb9548883827e62560d0b1e786851f4536 c9b07601c2f4a8c6c0bd8fe292d6d2e85b872d56 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '16', 'operation': 'amend', 'user': 'test'}
  c9b07601c2f4a8c6c0bd8fe292d6d2e85b872d56 eed7b08171dd3b5a9359789531abc0bed2161580 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '4', 'operation': 'rebase', 'user': 'test'}
  90c34d9f99aafcc26de07beb0b3c85856de0fa46 7fae9524de068a420f7fa9f262669c461ada141f 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '4', 'operation': 'rebase', 'user': 'test'}
  77174443ad6187ba2a216529d7c9785b5f309b70 cc55835562515ff390751032f9e735606c549e96 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '4', 'operation': 'rebase', 'user': 'test'}
  7fae9524de068a420f7fa9f262669c461ada141f e2ca321d00b4adb62525539578290e49e662da79 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '8', 'operation': 'amend', 'user': 'test'}
  e2ca321d00b4adb62525539578290e49e662da79 744c2a22b7da8397bcbd2d472911d51404e54a38 ff95a51a90b9c6710e71bc8ea62c382a5d45e500 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '12', 'operation': 'split', 'user': 'test'}
  $ hg --config extensions.evolve= obslog --all
  o  744c2a22b7da (21) c_G
  |    split(parent, content) from e2ca321d00b4 using split by test (Thu Jan 01 00:00:00 1970 +0000)
  |
  | @  ff95a51a90b9 (22) c_G
  |/     split(parent, content) from e2ca321d00b4 using split by test (Thu Jan 01 00:00:00 1970 +0000)
  |
  x  e2ca321d00b4 (20) c_G
  |    amended(content) from 7fae9524de06 using amend by test (Thu Jan 01 00:00:00 1970 +0000)
  |
  x  7fae9524de06 (18) c_G
  |    rebased(parent) from 90c34d9f99aa using rebase by test (Thu Jan 01 00:00:00 1970 +0000)
  |
  x  90c34d9f99aa (13) c_G
  |    reauthored(user) from 78da2467366f using amend by test (Thu Jan 01 00:00:00 1970 +0000)
  |
  x  78da2467366f (6) c_G
  
  $ hg export .
  # HG changeset patch
  # User test3
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID ff95a51a90b9c6710e71bc8ea62c382a5d45e500
  # Parent  744c2a22b7da8397bcbd2d472911d51404e54a38
  # EXP-Topic-Namespace my-tns
  # EXP-Topic blue
  c_G
  
  diff -r 744c2a22b7da -r ff95a51a90b9 ggg
  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
  +++ b/ggg	Thu Jan 01 00:00:00 1970 +0000
  @@ -0,0 +1,1 @@
  +ggg
  $ hg export .^
  # HG changeset patch
  # User test3
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 744c2a22b7da8397bcbd2d472911d51404e54a38
  # Parent  eed7b08171dd3b5a9359789531abc0bed2161580
  # EXP-Topic-Namespace my-tns
  # EXP-Topic blue
  c_G
  
  diff -r eed7b08171dd -r 744c2a22b7da Z
  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
  +++ b/Z	Thu Jan 01 00:00:00 1970 +0000
  @@ -0,0 +1,1 @@
  +zzz

Check that stack output still makes sense

  $ hg stack
  ### topic: blue
  ### target: default (branch)
  s4$ c_I (orphan)
  s3@ c_G (current)
  s2: c_G
  s1: c_D
  s0^ c_A (base)