Some notes:
- Replaced msgpack_unpacker usage with regular xmalloc’ed buffer. Also since
msgpack_unpack_next (as well as msgpack_unpacker_next) is not ever going to
return MSGPACK_UNPACK_EXTRA_BYTES this condition was checked manually.
Function that does return this status is msgpack_unpack, but it is marked as
obsolete.
- Zero type is checked prior to main switch in shada_read_next_item because
otherwise check would be skipped.
- Zeroing entry at the start of shada_read_next_item makes it safer.
- dedent('') does not work.
- v:oldfiles list is only replaced with bang, if it is NULL or empty.
Notes:
- E136 code greatly changed its meaning: now it is write error and not read
error.
- E195 was removed because shada_read_everything will already do all the
necessary error reporting.
- E886 can be reported by both :rshada and :wshada, but :rshada comes first and
AFAIR it is the only error which is not E575 and can be reported by :rshada.
According to the manual (POSIX) this is the only case when errno is set by these
functions. This is needed because some functions (e.g. buflist_new) leave errno
set to non-zero value under some conditions (e.g. when opening non-existing
files).
This test can safely be ignored for other kinds of strings, but history string
contains separator after the last NUL byte and string containing NUL byte inside
thus means that separator will be placed at one position, but seeked at
another.
What works:
1. ShaDa file dumping: header, registers, jump list, history, search patterns,
substitute strings, variables.
2. ShaDa file reading: registers, global marks, variables.
Most was not tested.
TODO:
1. Merging.
2. Reading history, local marks, jump and buffer lists.
3. Documentation update.
4. Converting some data from &encoding.
5. Safer variant of dumping viminfo (dump to temporary file then rename).
6. Removing old viminfo code (currently masked with `#if 0` in a ShaDa file for
reference).
