commitgraph/read/open.go


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

package read

import (
	"fmt"
	"os"

	objectid "codeberg.org/lindenii/furgit/object/id"
)

// Open opens commit-graph data from one objects root.
//
// Open borrows root during construction and does not close it.
func Open(root *os.Root, algo objectid.Algorithm, mode OpenMode) (*Reader, error) {
	if algo.Size() == 0 {
		return nil, objectid.ErrInvalidAlgorithm
	}

	switch mode {
	case OpenSingle:
		return openSingle(root, algo)
	case OpenChain:
		return openChain(root, algo)
	default:
		return nil, fmt.Errorf("commitgraph: invalid open mode %d", mode)
	}
}