tests/test-convert-datesort.t

upgrade: move descriptions and selection logic in individual classes

Our goal here is to get top level definition for all the format variants. Having
them defined outside of the function enabled other users of that logic.

They are two keys components of a format variant:

1) the name and various descriptions of its effect,

2) the code that checks if the repo is using this variant and if the config
   enables it.

That second items make us pick a class-based approach, since different variants
requires different code (even if in practice, many can reuse the same logic).
Each variants define its own class that is then used like a singleton.  The
class-based approach also clarify the definitions part a bit since each are
simple assignment in an indented block.

The 'fromdefault' and 'fromconfig' are respectively replaced by a class
attribute and a method to be called at the one place where "fromconfig"
matters.

Overall, they are many viable approach for this, but this is the one I picked.

  $ cat >> $HGRCPATH <<EOF
  > [extensions]
  > convert=
  > EOF
  $ hg init t
  $ cd t
  $ echo a >> a
  $ hg ci -Am a0 -d '1 0'
  adding a
  $ hg branch brancha
  marked working directory as branch brancha
  (branches are permanent and global, did you want a bookmark?)
  $ echo a >> a
  $ hg ci -m a1 -d '2 0'
  $ echo a >> a
  $ hg ci -m a2 -d '3 0'
  $ echo a >> a
  $ hg ci -m a3 -d '4 0'
  $ hg up -C 0
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg branch branchb
  marked working directory as branch branchb
  $ echo b >> b
  $ hg ci -Am b0 -d '6 0'
  adding b
  $ hg up -C brancha
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo a >> a
  $ hg ci -m a4 -d '5 0'
  $ echo a >> a
  $ hg ci -m a5 -d '7 0'
  $ echo a >> a
  $ hg ci -m a6 -d '8 0'
  $ hg up -C branchb
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo b >> b
  $ hg ci -m b1 -d '9 0'
  $ hg up -C 0
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo c >> c
  $ hg branch branchc
  marked working directory as branch branchc
  $ hg ci -Am c0 -d '10 0'
  adding c
  $ hg up -C brancha
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg ci --close-branch -m a7x -d '11 0'
  $ hg up -C branchb
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg ci --close-branch -m b2x -d '12 0'
  $ hg up -C branchc
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg merge branchb
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg ci -m c1 -d '13 0'
  $ cd ..

convert with datesort

  $ hg convert --datesort t t-datesort
  initializing destination t-datesort repository
  scanning source...
  sorting...
  converting...
  12 a0
  11 a1
  10 a2
  9 a3
  8 a4
  7 b0
  6 a5
  5 a6
  4 b1
  3 c0
  2 a7x
  1 b2x
  0 c1

graph converted repo

  $ hg -R t-datesort log -G --template '{rev} "{desc}"\n'
  o    12 "c1"
  |\
  | _  11 "b2x"
  | |
  | | _  10 "a7x"
  | | |
  o | |  9 "c0"
  | | |
  | o |  8 "b1"
  | | |
  | | o  7 "a6"
  | | |
  | | o  6 "a5"
  | | |
  | o |  5 "b0"
  |/ /
  | o  4 "a4"
  | |
  | o  3 "a3"
  | |
  | o  2 "a2"
  | |
  | o  1 "a1"
  |/
  o  0 "a0"
  

convert with datesort (default mode)

  $ hg convert t t-sourcesort
  initializing destination t-sourcesort repository
  scanning source...
  sorting...
  converting...
  12 a0
  11 a1
  10 a2
  9 a3
  8 b0
  7 a4
  6 a5
  5 a6
  4 b1
  3 c0
  2 a7x
  1 b2x
  0 c1

graph converted repo

  $ hg -R t-sourcesort log -G --template '{rev} "{desc}"\n'
  o    12 "c1"
  |\
  | _  11 "b2x"
  | |
  | | _  10 "a7x"
  | | |
  o | |  9 "c0"
  | | |
  | o |  8 "b1"
  | | |
  | | o  7 "a6"
  | | |
  | | o  6 "a5"
  | | |
  | | o  5 "a4"
  | | |
  | o |  4 "b0"
  |/ /
  | o  3 "a3"
  | |
  | o  2 "a2"
  | |
  | o  1 "a1"
  |/
  o  0 "a0"
  

convert with closesort

  $ hg convert --closesort t t-closesort
  initializing destination t-closesort repository
  scanning source...
  sorting...
  converting...
  12 a0
  11 a1
  10 a2
  9 a3
  8 b0
  7 a4
  6 a5
  5 a6
  4 a7x
  3 b1
  2 b2x
  1 c0
  0 c1

graph converted repo

  $ hg -R t-closesort log -G --template '{rev} "{desc}"\n'
  o    12 "c1"
  |\
  | o  11 "c0"
  | |
  _ |  10 "b2x"
  | |
  o |  9 "b1"
  | |
  | | _  8 "a7x"
  | | |
  | | o  7 "a6"
  | | |
  | | o  6 "a5"
  | | |
  | | o  5 "a4"
  | | |
  o | |  4 "b0"
  |/ /
  | o  3 "a3"
  | |
  | o  2 "a2"
  | |
  | o  1 "a1"
  |/
  o  0 "a0"