$ cat >> $HGRCPATH << EOF

  > [extensions]

  > show =

  > EOF

  $ hg init repo0

  $ cd repo0

Empty repo / no checkout results in error

  $ hg show stack

  abort: stack view only available when there is a working directory

  [255]

Stack displays single draft changeset as root revision

  $ echo 0 > foo

  $ hg -q commit -A -m 'commit 0'

  $ hg show stack

    @  9f171 commit 0

Stack displays multiple draft changesets

  $ echo 1 > foo

  $ hg commit -m 'commit 1'

  $ echo 2 > foo

  $ hg commit -m 'commit 2'

  $ echo 3 > foo

  $ hg commit -m 'commit 3'

  $ echo 4 > foo

  $ hg commit -m 'commit 4'

  $ hg show stack

    @  2737b commit 4

    o  d1a69 commit 3

    o  128c8 commit 2

    o  181cc commit 1

    o  9f171 commit 0

Public parent of draft base is displayed, separated from stack

  $ hg phase --public -r 0

  $ hg show stack

    @  2737b commit 4

    o  d1a69 commit 3

    o  128c8 commit 2

    o  181cc commit 1

   /   (stack base)

  o  9f171 commit 0

  $ hg phase --public -r 1

  $ hg show stack

    @  2737b commit 4

    o  d1a69 commit 3

    o  128c8 commit 2

   /   (stack base)

  o  181cc commit 1

Draft descendants are shown

  $ hg -q up 2

  $ hg show stack

    o  2737b commit 4

    o  d1a69 commit 3

    @  128c8 commit 2

   /   (stack base)

  o  181cc commit 1

  $ hg -q up 3

  $ hg show stack

    o  2737b commit 4

    @  d1a69 commit 3

    o  128c8 commit 2

   /   (stack base)

  o  181cc commit 1

working dir on public changeset should display special message

  $ hg -q up 1

  $ hg show stack

  (empty stack; working directory is a published changeset)

Branch point in descendants displayed at top of graph

  $ hg -q up 3

  $ echo b > foo

  $ hg commit -m 'commit 5 (new dag branch)'

  created new head

  $ hg -q up 2

  $ hg show stack

   \ /  (multiple children)

    |

    o  d1a69 commit 3

    @  128c8 commit 2

   /   (stack base)

  o  181cc commit 1

  $ cd ..

Base is stopped at merges

  $ hg init merge-base

  $ cd merge-base

  $ echo 0 > foo

  $ hg -q commit -A -m initial

  $ echo h1 > foo

  $ hg commit -m 'head 1'

  $ hg -q up 0

  $ echo h2 > foo

  $ hg -q commit -m 'head 2'

  $ hg phase --public -r 0:tip

  $ hg -q up 1

  $ hg merge -t :local 2

  0 files updated, 1 files merged, 0 files removed, 0 files unresolved

  (branch merge, don't forget to commit)

  $ hg commit -m 'merge heads'

TODO doesn't yet handle case where wdir is a draft merge

  $ hg show stack

    @  8ee90 merge heads

   /   (stack base)

  o  59478 head 1

  $ echo d1 > foo

  $ hg commit -m 'draft 1'

  $ echo d2 > foo

  $ hg commit -m 'draft 2'

  $ hg show stack

    @  430d5 draft 2

    o  787b1 draft 1

   /   (stack base)

  o  8ee90 merge heads

  $ cd ..

Now move on to stacks when there are more commits after the base branchpoint

  $ hg init public-rebase

  $ cd public-rebase

  $ echo 0 > foo

  $ hg -q commit -A -m 'base'

  $ hg phase --public -r .

  $ echo d1 > foo

  $ hg commit -m 'draft 1'

  $ echo d2 > foo

  $ hg commit -m 'draft 2'

  $ hg -q up 0

  $ echo 1 > foo

  $ hg commit -m 'new 1'

  created new head

  $ echo 2 > foo

  $ hg commit -m 'new 2'

  $ hg -q up 2

Newer draft heads don't impact output

  $ hg show stack

    @  eaffc draft 2

    o  2b218 draft 1

   /   (stack base)

  o  b66bb base

Newer public heads are rendered

  $ hg phase --public -r '::tip'

  $ hg show stack

    o  baa4b new 2

   /    (2 commits ahead)

  :

  :    (stack head)

  : @  eaffc draft 2

  : o  2b218 draft 1

  :/   (stack base)

  o  b66bb base

If rebase is available, we show a hint how to rebase to that head

  $ hg --config extensions.rebase= show stack

    o  baa4b new 2

   /    (2 commits ahead; hg rebase --source 2b218 --dest baa4b)

  :

  :    (stack head)

  : @  eaffc draft 2

  : o  2b218 draft 1

  :/   (stack base)

  o  b66bb base

Similar tests but for multiple heads

  $ hg -q up 0

  $ echo h2 > foo

  $ hg -q commit -m 'new head 2'

  $ hg phase --public -r .

  $ hg -q up 2

  $ hg show stack

    o  baa4b new 2

   /    (2 commits ahead)

  : o  9a848 new head 2

  :/    (1 commits ahead)

  :

  :    (stack head)

  : @  eaffc draft 2

  : o  2b218 draft 1

  :/   (stack base)

  o  b66bb base

  $ hg --config extensions.rebase= show stack

    o  baa4b new 2

   /    (2 commits ahead; hg rebase --source 2b218 --dest baa4b)

  : o  9a848 new head 2

  :/    (1 commits ahead; hg rebase --source 2b218 --dest 9a848)

  :

  :    (stack head)

  : @  eaffc draft 2

  : o  2b218 draft 1

  :/   (stack base)

  o  b66bb base