This commit introduces package github.com/git-lfs/git-lfs/git/gitattr,
which manifests a tree-like representation of a repository's
.gitattribute file(s).
It introduces the following top-level and member functions:
- func ParseLines(r io.Reader) ([]*Line, error)
Parses the lines of a .gitattributes-like io.Reader into a set of
wildmatch to attribute-set pairings, or an error if one was
encountered.
- func New(db *gitobj.ObjectDatabase, t *gitobj.Tree) (*Tree, error)
Visits all trees reachable from "t" in a depth-first search to
reconstruct a tree-representation of all .gitattributes file(s) in the
repository.
- func (t *Tree) Applied(to string) []*Attr
Finds all attributes in-order that are applied to "to" relative to the
receiving *Tree's location in the repository's tree structure.
This will become useful in subsequent commits when this is used to scan
a repository's .gitattributes files before rewriting the blobs in that
repository during the forthcoming 'git lfs migrate import --fixup' mode.
