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// Command show-object provides a small command line utility to show the details of a specified Git object.
package main
import (
"flag"
"fmt"
"log"
"os"
"strings"
"codeberg.org/lindenii/furgit/object/stored"
"codeberg.org/lindenii/furgit/objectid"
"codeberg.org/lindenii/furgit/objecttype"
"codeberg.org/lindenii/furgit/repository"
)
func main() {
repoPath := flag.String("r", "", "path to git dir (.git or bare repo root)")
name := flag.String("h", "", "reference name or object id")
flag.Parse()
if *repoPath == "" || *name == "" {
log.Fatal("must provide -r <repo> and -h <ref-or-object-id>")
}
err := run(repoPath, name)
if err != nil {
log.Fatalf("run: %v", err)
}
}
func run(repoPath, name *string) error {
root, err := os.OpenRoot(*repoPath)
if err != nil {
return fmt.Errorf("open repo root: %w", err)
}
defer func() { _ = root.Close() }()
repo, err := repository.Open(root)
if err != nil {
return fmt.Errorf("open repository: %w", err)
}
id, err := resolveInput(repo, *name)
if err != nil {
_ = repo.Close()
return fmt.Errorf("resolve %q: %w", *name, err)
}
s, err := repo.ReadStored(id)
if err != nil {
_ = repo.Close()
return fmt.Errorf("read object %s: %w", id, err)
}
printStored(s)
err = repo.Close()
if err != nil {
return fmt.Errorf("close repository: %w", err)
}
return nil
}
func resolveInput(repo *repository.Repository, input string) (objectid.ObjectID, error) {
id, err := objectid.ParseHex(repo.Algorithm(), strings.TrimSpace(input))
if err == nil {
return id, nil
}
resolved, err := repo.Refs().ResolveFully(input)
if err != nil {
return objectid.ObjectID{}, err
}
return resolved.ID, nil
}
func printStored(s stored.StoredObject) {
var b strings.Builder
id := s.ID()
ty := s.Object().ObjectType()
tyName, ok := objecttype.Name(ty)
if !ok {
tyName = fmt.Sprintf("type %d", ty)
}
fmt.Fprintf(&b, "id: %s\n", id)
fmt.Fprintf(&b, "type: %s\n", tyName)
switch s := s.(type) {
case *stored.StoredBlob:
blob := s.Blob()
fmt.Fprintf(&b, "size: %d\n", len(blob.Data))
fmt.Fprintf(&b, "data: %q\n", string(blob.Data))
case *stored.StoredTree:
tree := s.Tree()
fmt.Fprintf(&b, "entries: %d\n", len(tree.Entries))
for _, entry := range tree.Entries {
fmt.Fprintf(&b, "%06o %s\t%s\n", entry.Mode, entry.ID, entry.Name)
}
case *stored.StoredCommit:
commit := s.Commit()
fmt.Fprintf(&b, "tree: %s\n", commit.Tree)
for _, parent := range commit.Parents {
fmt.Fprintf(&b, "parent: %s\n", parent)
}
fmt.Fprintf(&b, "author: %s <%s>\n", commit.Author.Name, commit.Author.Email)
fmt.Fprintf(&b, "committer: %s <%s>\n", commit.Committer.Name, commit.Committer.Email)
fmt.Fprintf(&b, "message:\n%s\n", string(commit.Message))
case *stored.StoredTag:
tag := s.Tag()
targetTy, ok := objecttype.Name(tag.TargetType)
if !ok {
targetTy = fmt.Sprintf("type %d", tag.TargetType)
}
fmt.Fprintf(&b, "target: %s (%s)\n", tag.Target, targetTy)
fmt.Fprintf(&b, "name: %s\n", tag.Name)
if tag.Tagger != nil {
fmt.Fprintf(&b, "tagger: %s <%s>\n", tag.Tagger.Name, tag.Tagger.Email)
}
fmt.Fprintf(&b, "message:\n%s\n", string(tag.Message))
default:
fmt.Fprintf(&b, "%#v\n", s.Object())
}
_, _ = os.Stdout.WriteString(b.String())
}
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