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package testgit
import (
"bytes"
"fmt"
"strings"
"testing"
"lindenii.org/go/furgit/object/id"
"lindenii.org/go/furgit/object/typ"
)
// TreeEntry is one entry of a tree built by [Repo.MkTree]
// or reported by [Repo.LsTree].
type TreeEntry struct {
Mode string
Type typ.Type
OID id.ObjectID
Name string
}
// MkTree builds a tree object from entries and returns its object ID.
func (repo *Repo) MkTree(tb testing.TB, entries []TreeEntry) (id.ObjectID, error) {
tb.Helper()
var stdin bytes.Buffer
for _, entry := range entries {
fmt.Fprintf(&stdin, "%s %s %s\t%s\n", entry.Mode, entry.Type.Name(), entry.OID.String(), entry.Name)
}
stdout, err := repo.run(tb, &stdin, "git", "mktree")
if err != nil {
return id.ObjectID{}, fmt.Errorf("mktree: %w", err)
}
treeID, err := repo.objectFormat.FromString(strings.TrimSuffix(string(stdout), "\n"))
if err != nil {
return id.ObjectID{}, fmt.Errorf("parse git mktree output %q: %w", string(stdout), err)
}
return treeID, nil
}
// LsTree lists the top-level entries of a tree object in Git tree order.
func (repo *Repo) LsTree(tb testing.TB, oid id.ObjectID) ([]TreeEntry, error) {
tb.Helper()
stdout, err := repo.run(tb, nil, "git", "ls-tree", "-z", "--full-tree", "--end-of-options", oid.String())
if err != nil {
return nil, fmt.Errorf("ls-tree: %w", err)
}
var entries []TreeEntry
for record := range bytes.SplitSeq(stdout, []byte{0}) {
if len(record) == 0 {
continue
}
meta, name, found := bytes.Cut(record, []byte{'\t'})
if !found {
return nil, fmt.Errorf("ls-tree: record %q has no tab separator", record)
}
fields := bytes.SplitN(meta, []byte{' '}, 3)
if len(fields) != 3 {
return nil, fmt.Errorf("ls-tree: record %q has malformed metadata", record)
}
ty, err := typ.Parse(string(fields[1]))
if err != nil {
return nil, fmt.Errorf("ls-tree: record %q: parse type: %w", record, err)
}
entryOID, err := repo.objectFormat.FromString(string(fields[2]))
if err != nil {
return nil, fmt.Errorf("ls-tree: record %q: parse oid: %w", record, err)
}
entries = append(entries, TreeEntry{
Mode: string(fields[0]),
Type: ty,
OID: entryOID,
Name: string(name),
})
}
return entries, nil
}
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