Inconsistencies between git and darcs.

Summary:

- git allows you to create a file named '*';
  darcs doesn't (though it doesn't throw an
  error when you try). Similarly with '?'.

- when you try to delete '*', git deletes
  everything, treating '*' as wildcard.
  darcs gives a nonexistent file message.

- when you delete a file and then try to
  create a file with the same name, git gives
  you an error "Resource Exists". But git doesn't
  allow you to modify the resource either.
  darcs behaves better.

See transcript below:

Prelude> :m + Data.FileStore
Prelude Data.FileStore> let d = darcsFileStore "d"
Prelude Data.FileStore> let a = Author "j" ""
Prelude Data.FileStore> create d "aaa" a "n" "hi"
Prelude Data.FileStore> index d
["aaa"]
Prelude Data.FileStore> create d "*" a "n" "hi"
Prelude Data.FileStore> index d
["aaa"]
Prelude Data.FileStore> delete d "*" a "n"
*** Exception: UnknownError: Could not darcs record *

darcs failed:  None of the files you specified exist!

Prelude Data.FileStore> index d
["aaa"]
Prelude Data.FileStore> delete d "aaa" a "n"
Prelude Data.FileStore> index d
[]
Prelude Data.FileStore> create d "aaa" a "n" "hi"
Prelude Data.FileStore> index d
["aaa"]

Prelude Data.FileStore> let g = gitFileStore "g"
Prelude Data.FileStore> initialize g
Prelude Data.FileStore> index g
[]
Prelude Data.FileStore> create g "*" a "hi" "contents"
Prelude Data.FileStore> index g
["*"]
Prelude Data.FileStore> create g "aa" a "hi" "contents"
Prelude Data.FileStore> index g
["*","aa"]
Prelude Data.FileStore> delete g "*" a "hi"
Prelude Data.FileStore> index g
[]
Prelude Data.FileStore> create g "aa" a "hi" "contents"
*** Exception: ResourceExists
Prelude Data.FileStore> latest g "aa"
"ba42127ed54a804570fc0fd3b979d2bc1ebf1fd7"
Prelude Data.FileStore> modify g "aa" "ba412" a "hi" "contents"
*** Exception: NotFound


-------------------------------------

Note:  git will detect renames in "log" and "whatchanged"
if you supply the "-M" flag:

jgm@protagoras:~/tmp/ebo/aaa [26]% git whatchanged
commit 06676810341c00b306b1afc6d1ab7daaf86daa96
Author: John MacFarlane <jgm@berkeley.edu>
Date:   Fri Jan 16 18:54:34 2009 -0800

    added new a

:000000 100644 0000000... e69de29... A  a

commit c46967e899d01edb552d37689c6b0e9861d6e458
Author: John MacFarlane <jgm@berkeley.edu>
Date:   Fri Jan 16 18:54:16 2009 -0800

    moved a to b

:100644 000000 e69de29... 0000000... D  a
:000000 100644 0000000... e69de29... A  b

commit 4b86a6b28537593d362c18357f8cc0ac3a493ecf
Author: John MacFarlane <jgm@berkeley.edu>
Date:   Fri Jan 16 18:54:08 2009 -0800

    added a

:000000 100644 0000000... e69de29... A  a

jgm@protagoras:~/tmp/ebo/aaa [27]% git whatchanged -M
commit 06676810341c00b306b1afc6d1ab7daaf86daa96
Author: John MacFarlane <jgm@berkeley.edu>
Date:   Fri Jan 16 18:54:34 2009 -0800

    added new a

:000000 100644 0000000... e69de29... A  a

commit c46967e899d01edb552d37689c6b0e9861d6e458
Author: John MacFarlane <jgm@berkeley.edu>
Date:   Fri Jan 16 18:54:16 2009 -0800

    moved a to b

:100644 100644 e69de29... e69de29... R100       a       b

commit 4b86a6b28537593d362c18357f8cc0ac3a493ecf
Author: John MacFarlane <jgm@berkeley.edu>
Date:   Fri Jan 16 18:54:08 2009 -0800

    added a

:000000 100644 0000000... e69de29... A  a