feat(adapter): registry with detect filtering and duplicate guard

internal/gitx/repo.go

@@ -0,0 +1,74 @@
+// Package gitx wraps git CLI invocations the canonical repo needs.
+package gitx
+
+import (
+	"bytes"
+	"fmt"
+	"os/exec"
+)
+
+type Repo struct {
+	Dir string
+}
+
+func New(dir string) *Repo { return &Repo{Dir: dir} }
+
+func (r *Repo) run(args ...string) ([]byte, error) {
+	cmd := exec.Command("git", args...)
+	cmd.Dir = r.Dir
+	var stdout, stderr bytes.Buffer
+	cmd.Stdout = &stdout
+	cmd.Stderr = &stderr
+	if err := cmd.Run(); err != nil {
+		return nil, fmt.Errorf("git %v: %w: %s", args, err, stderr.String())
+	}
+	return stdout.Bytes(), nil
+}
+
+func (r *Repo) Init() error {
+	_, err := r.run("init", "-q", "-b", "main")
+	return err
+}
+
+func (r *Repo) Configure(name, email string) error {
+	if _, err := r.run("config", "user.name", name); err != nil {
+		return err
+	}
+	_, err := r.run("config", "user.email", email)
+	return err
+}
+
+func (r *Repo) AddAll() error {
+	_, err := r.run("add", "-A")
+	return err
+}
+
+func (r *Repo) Add(paths ...string) error {
+	args := append([]string{"add", "--"}, paths...)
+	_, err := r.run(args...)
+	return err
+}
+
+func (r *Repo) Commit(msg string) error {
+	_, err := r.run("commit", "-q", "-m", msg)
+	return err
+}
+
+func (r *Repo) HeadCommit() (string, error) {
+	b, err := r.run("rev-parse", "HEAD")
+	return string(bytes.TrimSpace(b)), err
+}
+
+func (r *Repo) ShowFileAtHead(path string) ([]byte, error) {
+	return r.run("show", "HEAD:"+path)
+}
+
+func (r *Repo) IsRepo() bool {
+	_, err := r.run("rev-parse", "--git-dir")
+	return err == nil
+}
+
+func (r *Repo) Revert(n int) error {
+	_, err := r.run("revert", "--no-edit", fmt.Sprintf("HEAD~%d..HEAD", n-1))
+	return err
+}

internal/gitx/repo_test.go

@@ -0,0 +1,43 @@
+package gitx
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestInitAddCommit(t *testing.T) {
+	dir := t.TempDir()
+	r := New(dir)
+
+	require.NoError(t, r.Init())
+	require.NoError(t, r.Configure("nobody", "[email protected]"))
+
+	require.NoError(t, os.WriteFile(filepath.Join(dir, "a.txt"), []byte("hi"), 0o600))
+	require.NoError(t, r.AddAll())
+	require.NoError(t, r.Commit("initial"))
+
+	head, err := r.HeadCommit()
+	require.NoError(t, err)
+	assert.NotEmpty(t, head)
+}
+
+func TestShowFileAtHead(t *testing.T) {
+	dir := t.TempDir()
+	r := New(dir)
+	require.NoError(t, r.Init())
+	require.NoError(t, r.Configure("nobody", "[email protected]"))
+	require.NoError(t, os.WriteFile(filepath.Join(dir, "a.txt"), []byte("v1"), 0o600))
+	require.NoError(t, r.AddAll())
+	require.NoError(t, r.Commit("v1"))
+
+	body, err := r.ShowFileAtHead("a.txt")
+	require.NoError(t, err)
+	assert.Equal(t, "v1", string(body))
+
+	_, err = r.ShowFileAtHead("nope.txt")
+	assert.Error(t, err)
+}