Git does not quote file names containing spaces when generating header
lines. However, I misread the Git implementation and thought it used
spaces as a name terminator by default, implying that names with spaces
would be quoted.
Rewrite the the name parsing code to better match Git. Specifically,
when both names in a header are not quoted, test all splits to see if
any of them produce two equal names. Also account for spaces in file
names when parsing file metadata.
Finally, allow trailing spaces on file names, which seem to be allowed
by Git (although this sounds like a terrible idea to me.)
Covers that multiple fragments actually works and the unique error
contidions, but otherwise relies on the lower level tests for
correctness. Also update some comments and the README based on
observations from writing/debugging these tests.
The parsed OIDs are usually prefixes, not full hashes, so rename the
fields appropriately. Also note that values that are too long to be
valid OIDs are still accepted by the library.
Fix parseGitHeaderIndex to allow abbreviated OIDs and add a note about
this to the README. The behavior might change again later, based on some
experimentation with Git.
Billy Keyes