Parse two-line from-file/to-file unified diff header in
git_patchset_body directly, instead of leaving pretty-printing to
format_diff_line function. Hashes as from-file/to-file are replaced
by proper from-file and to-file names (from $diffinfo); in the future
we can put hyperlinks there. This makes possible to do blobdiff with
only blobs hashes.
The lines in two-line unified diff header have now class "from_file"
and "to_file"; the style is chosen to match previous output (classes
"rem" and "add" because of '-' and '+' as first character of patch
line).
Signed-off-by: Jakub Narebski <jnareb@gmail.com> Signed-off-by: Junio C Hamano <junkio@cox.net>