test of the split command
-----------------------

  $ cat >> $HGRCPATH <<EOF
  > [defaults]
  > amend=-d "0 0"
  > fold=-d "0 0"
  > split=-d "0 0"
  > amend=-d "0 0"
  > [web]
  > push_ssl = false
  > allow_push = *
  > [phases]
  > publish = False
  > [diff]
  > git = 1
  > unified = 0
  > [ui]
  > interactive = true
  > [extensions]
  > hgext.graphlog=
  > EOF
  $ echo "evolve=$(echo $(dirname $TESTDIR))/hgext/evolve.py" >> $HGRCPATH
  $ mkcommit() {
  >    echo "$1" > "$1"
  >    hg add "$1"
  >    hg ci -m "add $1"
  > }


Basic case, split a head
  $ hg init testsplit
  $ cd testsplit
  $ mkcommit _a
  $ mkcommit _b
  $ mkcommit _c
  $ mkcommit _d
  $ echo "change to a" >> _a
  $ hg amend
  $ hg debugobsolete
  9e84a109b8eb081ad754681ee4b1380d17a3741f aa8f656bb307022172d2648be6fb65322f801225 0 (*) {'user': 'test'} (glob)
  f002b57772d7f09b180c407213ae16d92996a988 0 {9e84a109b8eb081ad754681ee4b1380d17a3741f} (*) {'user': 'test'} (glob)

To create commits with the number of split
  $ export NUM=0
  $ export HGEDITOR="NUM=$((NUM+1)); echo split$NUM > $1"
  $ hg split << EOF
  > y
  > y
  > y
  > n
  > N
  > y
  > y
  > EOF
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  reverting _a
  adding _d
  diff --git a/_a b/_a
  1 hunks, 1 lines changed
  examine changes to '_a'? [Ynesfdaq?] y
  
  @@ -1,0 +2,1 @@
  +change to a
  record change 1/2 to '_a'? [Ynesfdaq?] y
  
  diff --git a/_d b/_d
  new file mode 100644
  examine changes to '_d'? [Ynesfdaq?] y
  
  @@ -0,0 +1,1 @@
  +_d
  record change 2/2 to '_d'? [Ynesfdaq?] n
  
  created new head
  Done splitting? [yN] N
  diff --git a/_d b/_d
  new file mode 100644
  examine changes to '_d'? [Ynesfdaq?] y
  
  @@ -0,0 +1,1 @@
  +_d
  record this change to '_d'? [Ynesfdaq?] y
  
  no more change to split

  $ hg debugobsolete
  9e84a109b8eb081ad754681ee4b1380d17a3741f aa8f656bb307022172d2648be6fb65322f801225 0 (*) {'user': 'test'} (glob)
  f002b57772d7f09b180c407213ae16d92996a988 0 {9e84a109b8eb081ad754681ee4b1380d17a3741f} (*) {'user': 'test'} (glob)
  aa8f656bb307022172d2648be6fb65322f801225 8a76f55839e6badd47ed8338803d8bc16f578d68 1e105584671a463974ee2122f95979ce5e507f1a 0 (*) {'user': 'test'} (glob)

Cannot split a commit with uncommited changes
  $ hg up "desc(_c)"
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo "_cd" > _c
  $ hg split 
  abort: uncommitted changes
  [255]

Split a revision specified with -r
  $ hg up "desc(_c)" -C
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo "change to b" >> _b
  $ hg amend -m "_cprim"
  2 new unstable changesets
  $ hg evolve --all
  move:[6] split0
  atop:[9] _cprim
  move:[7] split0
  atop:[10] split0
  working directory is now at * (glob)
  $ hg log -r "desc(_cprim)" -v -p
  changeset:   9:719157b217ac
  parent:      1:37445b16603b
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  files:       _b _c
  description:
  _cprim
  
  
  diff --git a/_b b/_b
  --- a/_b
  +++ b/_b
  @@ -1,0 +2,1 @@
  +change to b
  diff --git a/_c b/_c
  new file mode 100644
  --- /dev/null
  +++ b/_c
  @@ -0,0 +1,1 @@
  +_c
  
  $ hg split -r "desc(_cprim)" <<EOF
  > y
  > y
  > y
  > n
  > y
  > EOF
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  reverting _b
  adding _c
  diff --git a/_b b/_b
  1 hunks, 1 lines changed
  examine changes to '_b'? [Ynesfdaq?] y
  
  @@ -1,0 +2,1 @@
  +change to b
  record change 1/2 to '_b'? [Ynesfdaq?] y
  
  diff --git a/_c b/_c
  new file mode 100644
  examine changes to '_c'? [Ynesfdaq?] y
  
  @@ -0,0 +1,1 @@
  +_c
  record change 2/2 to '_c'? [Ynesfdaq?] n
  
  created new head
  Done splitting? [yN] y

Stop before splitting the commit completely creates a commit with all the
remaining changes

  $ hg debugobsolete
  9e84a109b8eb081ad754681ee4b1380d17a3741f aa8f656bb307022172d2648be6fb65322f801225 0 (*) {'user': 'test'} (glob)
  f002b57772d7f09b180c407213ae16d92996a988 0 {9e84a109b8eb081ad754681ee4b1380d17a3741f} (*) {'user': 'test'} (glob)
  aa8f656bb307022172d2648be6fb65322f801225 8a76f55839e6badd47ed8338803d8bc16f578d68 1e105584671a463974ee2122f95979ce5e507f1a 0 (*) {'user': 'test'} (glob)
  10200229058723ce8d67f6612c1f6b4f73b1fe73 719157b217acc43d397369a448824ed4c7a302f2 0 (*) {'user': 'test'} (glob)
  5d0c8b0f2d3e5e1ff95f93d7da2ba06650605ab5 0 {10200229058723ce8d67f6612c1f6b4f73b1fe73} (*) {'user': 'test'} (glob)
  8a76f55839e6badd47ed8338803d8bc16f578d68 0ea1d0d23e674ea8a6affe760741c82bb8e380f7 0 (*) {'user': 'test'} (glob)
  1e105584671a463974ee2122f95979ce5e507f1a b6099ccb49cae181af7c59ed5603a1dfca632445 0 (*) {'user': 'test'} (glob)
  719157b217acc43d397369a448824ed4c7a302f2 8eb71353cb2c70fc1154be3af79c0ce98898ae88 ead904640c8543606f72490c6ae10955fb11fff0 0 (*) {'user': 'test'} (glob)

Cannot specify multiple revisions with -r
  $ hg split -r "desc(_a)::"
  abort: you can only specify one revision to split
  [255]

Cannot split a commit that is not a head if instability is not allowed
  $ cat >> $HGRCPATH <<EOF
  > [experimental]
  > evolution=createmarkers
  > evolutioncommands=split
  > EOF
  $ hg split -r "desc(_c)"
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  abort: cannot split commit: 719157b217ac not a head
  [255]