tests/test-histedit-edit.t

py3: conditionalize the raise statement

raise E,V,T is not acceptable in Python 3, thats is conditionalized.
Moreover this will result in syntax error so we have to use exec() to
execute this. Related PEP- https://www.python.org/dev/peps/pep-3109/#id14

My implementation is motivated from the six implementation except they are
defining a new function exec_() to prevent adding an extra frame AFAIK :)

https://bitbucket.org/gutworth/six/src/ca4580a5a648/six.py#six.py-680

  $ . "$TESTDIR/histedit-helpers.sh"

  $ cat >> $HGRCPATH <<EOF
  > [extensions]
  > histedit=
  > strip=
  > EOF

  $ initrepo ()
  > {
  >     hg init r
  >     cd r
  >     for x in a b c d e f g; do
  >         echo $x > $x
  >         hg add $x
  >         hg ci -m $x
  >     done
  > }

  $ initrepo

log before edit
  $ hg log --graph
  @  changeset:   6:3c6a8ed2ebe8
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     g
  |
  o  changeset:   5:652413bf663e
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     f
  |
  o  changeset:   4:e860deea161a
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     e
  |
  o  changeset:   3:055a42cdd887
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     d
  |
  o  changeset:   2:177f92b77385
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     c
  |
  o  changeset:   1:d2ae7f538514
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     b
  |
  o  changeset:   0:cb9a9f314b8b
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     a
  
dirty a file
  $ echo a > g
  $ hg histedit 177f92b77385 --commands - 2>&1 << EOF
  > EOF
  abort: uncommitted changes
  [255]
  $ echo g > g

edit the history
  $ hg histedit 177f92b77385 --commands - 2>&1 << EOF| fixbundle
  > pick 177f92b77385 c
  > pick 055a42cdd887 d
  > edit e860deea161a e
  > pick 652413bf663e f
  > pick 3c6a8ed2ebe8 g
  > EOF
  0 files updated, 0 files merged, 3 files removed, 0 files unresolved
  Editing (e860deea161a), you may commit or record as needed now.
  (hg histedit --continue to resume)

try to update and get an error
  $ hg update tip
  abort: histedit in progress
  (use 'hg histedit --continue' or 'hg histedit --abort')
  [255]

edit the plan via the editor
  $ cat >> $TESTTMP/editplan.sh <<EOF
  > cat > \$1 <<EOF2
  > drop e860deea161a e
  > drop 652413bf663e f
  > drop 3c6a8ed2ebe8 g
  > EOF2
  > EOF
  $ HGEDITOR="sh $TESTTMP/editplan.sh" hg histedit --edit-plan
  $ cat .hg/histedit-state
  v1
  055a42cdd88768532f9cf79daa407fc8d138de9b
  3c6a8ed2ebe862cc949d2caa30775dd6f16fb799
  False
  3
  drop
  e860deea161a2f77de56603b340ebbb4536308ae
  drop
  652413bf663ef2a641cab26574e46d5f5a64a55a
  drop
  3c6a8ed2ebe862cc949d2caa30775dd6f16fb799
  0
  strip-backup/177f92b77385-0ebe6a8f-histedit.hg

edit the plan via --commands
  $ hg histedit --edit-plan --commands - 2>&1 << EOF
  > edit e860deea161a e
  > pick 652413bf663e f
  > drop 3c6a8ed2ebe8 g
  > EOF
  $ cat .hg/histedit-state
  v1
  055a42cdd88768532f9cf79daa407fc8d138de9b
  3c6a8ed2ebe862cc949d2caa30775dd6f16fb799
  False
  3
  edit
  e860deea161a2f77de56603b340ebbb4536308ae
  pick
  652413bf663ef2a641cab26574e46d5f5a64a55a
  drop
  3c6a8ed2ebe862cc949d2caa30775dd6f16fb799
  0
  strip-backup/177f92b77385-0ebe6a8f-histedit.hg

Go at a random point and try to continue

  $ hg id -n
  3+
  $ hg up 0
  abort: histedit in progress
  (use 'hg histedit --continue' or 'hg histedit --abort')
  [255]

Try to delete necessary commit
  $ hg strip -r 652413b
  abort: histedit in progress, can't strip 652413bf663e
  [255]

commit, then edit the revision
  $ hg ci -m 'wat'
  created new head
  $ echo a > e

qnew should fail while we're in the middle of the edit step

  $ hg --config extensions.mq= qnew please-fail
  abort: histedit in progress
  (use 'hg histedit --continue' or 'hg histedit --abort')
  [255]
  $ HGEDITOR='echo foobaz > ' hg histedit --continue 2>&1 | fixbundle

  $ hg log --graph
  @  changeset:   6:b5f70786f9b0
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     f
  |
  o  changeset:   5:a5e1ba2f7afb
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     foobaz
  |
  o  changeset:   4:1a60820cd1f6
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     wat
  |
  o  changeset:   3:055a42cdd887
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     d
  |
  o  changeset:   2:177f92b77385
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     c
  |
  o  changeset:   1:d2ae7f538514
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     b
  |
  o  changeset:   0:cb9a9f314b8b
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     a
  

  $ hg cat e
  a

Stripping necessary commits should not break --abort

  $ hg histedit 1a60820cd1f6 --commands - 2>&1 << EOF| fixbundle
  > edit 1a60820cd1f6 wat
  > pick a5e1ba2f7afb foobaz
  > pick b5f70786f9b0 g
  > EOF
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  Editing (1a60820cd1f6), you may commit or record as needed now.
  (hg histedit --continue to resume)

  $ mv .hg/histedit-state .hg/histedit-state.bak
  $ hg strip -q -r b5f70786f9b0
  $ mv .hg/histedit-state.bak .hg/histedit-state
  $ hg histedit --abort
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 3 files
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg log -r .
  changeset:   6:b5f70786f9b0
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     f
  

check histedit_source

  $ hg log --debug --rev 5
  changeset:   5:a5e1ba2f7afb899ef1581cea528fd885d2fca70d
  phase:       draft
  parent:      4:1a60820cd1f6004a362aa622ebc47d59bc48eb34
  parent:      -1:0000000000000000000000000000000000000000
  manifest:    5:5ad3be8791f39117565557781f5464363b918a45
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  files:       e
  extra:       branch=default
  extra:       histedit_source=e860deea161a2f77de56603b340ebbb4536308ae
  description:
  foobaz
  
  

  $ hg histedit tip --commands - 2>&1 <<EOF| fixbundle
  > edit b5f70786f9b0 f
  > EOF
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  Editing (b5f70786f9b0), you may commit or record as needed now.
  (hg histedit --continue to resume)
  $ hg status
  A f

  $ hg summary
  parent: 5:a5e1ba2f7afb 
   foobaz
  branch: default
  commit: 1 added (new branch head)
  update: 1 new changesets (update)
  phases: 7 draft
  hist:   1 remaining (histedit --continue)

(test also that editor is invoked if histedit is continued for
"edit" action)

  $ HGEDITOR='cat' hg histedit --continue
  f
  
  
  HG: Enter commit message.  Lines beginning with 'HG:' are removed.
  HG: Leave message empty to abort commit.
  HG: --
  HG: user: test
  HG: branch 'default'
  HG: added f
  saved backup bundle to $TESTTMP/r/.hg/strip-backup/b5f70786f9b0-c28d9c86-backup.hg (glob)

  $ hg status

log after edit
  $ hg log --limit 1
  changeset:   6:a107ee126658
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     f
  

say we'll change the message, but don't.
  $ cat > ../edit.sh <<EOF
  > cat "\$1" | sed s/pick/mess/ > tmp
  > mv tmp "\$1"
  > EOF
  $ HGEDITOR="sh ../edit.sh" hg histedit tip 2>&1 | fixbundle
  $ hg status
  $ hg log --limit 1
  changeset:   6:1fd3b2fe7754
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     f
  

modify the message

check saving last-message.txt, at first

  $ cat > $TESTTMP/commitfailure.py <<EOF
  > from mercurial import error
  > def reposetup(ui, repo):
  >     class commitfailure(repo.__class__):
  >         def commit(self, *args, **kwargs):
  >             raise error.Abort('emulating unexpected abort')
  >     repo.__class__ = commitfailure
  > EOF
  $ cat >> .hg/hgrc <<EOF
  > [extensions]
  > # this failure occurs before editor invocation
  > commitfailure = $TESTTMP/commitfailure.py
  > EOF

  $ cat > $TESTTMP/editor.sh <<EOF
  > echo "==== before editing"
  > cat \$1
  > echo "===="
  > echo "check saving last-message.txt" >> \$1
  > EOF

(test that editor is not invoked before transaction starting)

  $ rm -f .hg/last-message.txt
  $ HGEDITOR="sh $TESTTMP/editor.sh" hg histedit tip --commands - 2>&1 << EOF | fixbundle
  > mess 1fd3b2fe7754 f
  > EOF
  abort: emulating unexpected abort
  $ test -f .hg/last-message.txt
  [1]

  $ cat >> .hg/hgrc <<EOF
  > [extensions]
  > commitfailure = !
  > EOF
  $ hg histedit --abort -q

(test that editor is invoked and commit message is saved into
"last-message.txt")

  $ cat >> .hg/hgrc <<EOF
  > [hooks]
  > # this failure occurs after editor invocation
  > pretxncommit.unexpectedabort = false
  > EOF

  $ hg status --rev '1fd3b2fe7754^1' --rev 1fd3b2fe7754
  A f

  $ rm -f .hg/last-message.txt
  $ HGEDITOR="sh $TESTTMP/editor.sh" hg histedit tip --commands - 2>&1 << EOF
  > mess 1fd3b2fe7754 f
  > EOF
  ==== before editing
  f
  
  
  HG: Enter commit message.  Lines beginning with 'HG:' are removed.
  HG: Leave message empty to abort commit.
  HG: --
  HG: user: test
  HG: branch 'default'
  HG: added f
  ====
  note: commit message saved in .hg/last-message.txt
  transaction abort!
  rollback completed
  abort: pretxncommit.unexpectedabort hook exited with status 1
  [255]
  $ cat .hg/last-message.txt
  f
  
  
  check saving last-message.txt

(test also that editor is invoked if histedit is continued for "message"
action)

  $ HGEDITOR=cat hg histedit --continue
  f
  
  
  HG: Enter commit message.  Lines beginning with 'HG:' are removed.
  HG: Leave message empty to abort commit.
  HG: --
  HG: user: test
  HG: branch 'default'
  HG: added f
  note: commit message saved in .hg/last-message.txt
  transaction abort!
  rollback completed
  abort: pretxncommit.unexpectedabort hook exited with status 1
  [255]

  $ cat >> .hg/hgrc <<EOF
  > [hooks]
  > pretxncommit.unexpectedabort =
  > EOF
  $ hg histedit --abort -q

then, check "modify the message" itself

  $ hg histedit tip --commands - 2>&1 << EOF | fixbundle
  > mess 1fd3b2fe7754 f
  > EOF
  $ hg status
  $ hg log --limit 1
  changeset:   6:62feedb1200e
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     f
  

rollback should not work after a histedit
  $ hg rollback
  no rollback information available
  [1]

  $ cd ..
  $ hg clone -qr0 r r0
  $ cd r0
  $ hg phase -fdr0
  $ hg histedit --commands - 0 2>&1 << EOF
  > edit cb9a9f314b8b a > $EDITED
  > EOF
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  adding a
  Editing (cb9a9f314b8b), you may commit or record as needed now.
  (hg histedit --continue to resume)
  [1]
  $ HGEDITOR=true hg histedit --continue
  saved backup bundle to $TESTTMP/r0/.hg/strip-backup/cb9a9f314b8b-cc5ccb0b-backup.hg (glob)

  $ hg log -G
  @  changeset:   0:0efcea34f18a
     tag:         tip
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     a
  
  $ echo foo >> b
  $ hg addr
  adding b
  $ hg ci -m 'add b'
  $ echo foo >> a
  $ hg ci -m 'extend a'
  $ hg phase --public 1
Attempting to fold a change into a public change should not work:
  $ cat > ../edit.sh <<EOF
  > cat "\$1" | sed s/pick/fold/ > tmp
  > mv tmp "\$1"
  > EOF
  $ HGEDITOR="sh ../edit.sh" hg histedit 2
  warning: histedit rules saved to: .hg/histedit-last-edit.txt
  hg: parse error: cannot fold into public change 18aa70c8ad22
  [255]
  $ cat .hg/histedit-last-edit.txt
  fold 0012be4a27ea 2 extend a
  
  # Edit history between 0012be4a27ea and 0012be4a27ea
  #
  # Commits are listed from least to most recent
  #
  # You can reorder changesets by reordering the lines
  #
  # Commands:
  #
  #  e, edit = use commit, but stop for amending
  #  m, mess = edit commit message without changing commit content
  #  p, fold = use commit
  #  d, drop = remove commit from history
  #  f, fold = use commit, but combine it with the one above
  #  r, roll = like fold, but discard this commit's description
  #