commit_utils.go

package git

import (
	"bytes"
)

// Parse commit information from the (uncompressed) raw
// data from the commit object.
// \n\n separate headers from message
func parseCommitData(data []byte) (*Commit, error) {
	commit := new(Commit)
	commit.parents = make([]sha1, 0, 1)
	// we now have the contents of the commit object. Let's investigate...
	nextline := 0
l:
	for {
		eol := bytes.IndexByte(data[nextline:], '\n')
		switch {
		case eol > 0:
			line := data[nextline : nextline+eol]
			spacepos := bytes.IndexByte(line, ' ')
			reftype := line[:spacepos]
			switch string(reftype) {
			case "tree":
				id, err := NewIdFromString(string(line[spacepos+1:]))
				if err != nil {
					return nil, err
				}
				commit.Tree.Id = id
			case "parent":
				// A commit can have one or more parents
				oid, err := NewIdFromString(string(line[spacepos+1:]))
				if err != nil {
					return nil, err
				}
				commit.parents = append(commit.parents, oid)
			case "author":
				sig, err := newSignatureFromCommitline(line[spacepos+1:])
				if err != nil {
					return nil, err
				}
				commit.Author = sig
			case "committer":
				sig, err := newSignatureFromCommitline(line[spacepos+1:])
				if err != nil {
					return nil, err
				}
				commit.Committer = sig
			}
			nextline += eol + 1
		case eol == 0:
			commit.CommitMessage = string(data[nextline+1:])
			break l
		default:
			break l
		}
	}
	return commit, nil
}