/*
+(See Documentation/git-fast-import.txt for maintained documentation.)
Format of STDIN stream:
stream ::= cmd*;
new_commit ::= 'commit' sp ref_str lf
mark?
- ('author' sp name '<' email '>' when lf)?
- 'committer' sp name '<' email '>' when lf
+ ('author' sp name sp '<' email '>' sp when lf)?
+ 'committer' sp name sp '<' email '>' sp when lf
commit_msg
('from' sp (ref_str | hexsha1 | sha1exp_str | idnum) lf)?
('merge' sp (ref_str | hexsha1 | sha1exp_str | idnum) lf)*
new_tag ::= 'tag' sp tag_str lf
'from' sp (ref_str | hexsha1 | sha1exp_str | idnum) lf
- ('tagger' sp name '<' email '>' when lf)?
+ ('tagger' sp name sp '<' email '>' sp when lf)?
tag_msg;
tag_msg ::= data;