tests/test-absorb-edit-lines.t

changelog-v2: use helper constant in the code to pack/unpack entries

This makes the code simpler to read and modify. This is probably less
efficient, but we are talking about the Python implementation here, so
performance is concerne secondary to readability.

Differential Revision: https://phab.mercurial-scm.org/D11934

  $ cat >> $HGRCPATH << EOF
  > [extensions]
  > absorb=
  > EOF

  $ hg init repo1
  $ cd repo1

Make some commits:

  $ for i in 1 2 3; do
  >   echo $i >> a
  >   hg commit -A a -m "commit $i" -q
  > done

absorb --edit-lines will run the editor if filename is provided:

  $ hg absorb --edit-lines --apply-changes
  nothing applied
  [1]
  $ HGEDITOR=cat hg absorb --edit-lines --apply-changes a
  HG: editing a
  HG: "y" means the line to the right exists in the changeset to the top
  HG:
  HG: /---- 4ec16f85269a commit 1
  HG: |/--- 5c5f95224a50 commit 2
  HG: ||/-- 43f0a75bede7 commit 3
  HG: |||
      yyy : 1
       yy : 2
        y : 3
  nothing applied
  [1]

Edit the file using --edit-lines:

  $ cat > editortext << EOF
  >       y : a
  >      yy :  b
  >      y  : c
  >     yy  : d  
  >     y y : e
  >     y   : f
  >     yyy : g
  > EOF
  $ HGEDITOR='cat editortext >' hg absorb -q --edit-lines --apply-changes a
  $ hg cat -r 0 a
  d  
  e
  f
  g
  $ hg cat -r 1 a
   b
  c
  d  
  g
  $ hg cat -r 2 a
  a
   b
  e
  g