primeiro commit

internal/hook/hook.go

@@ -0,0 +1,48 @@
+// Package hook runs post-sync hook scripts.
+package hook
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"os/exec"
+	"strconv"
+
+	"s3watch/internal/syncer"
+)
+
+// Runner executes a configured hook script after changes.
+type Runner struct {
+	path string
+	dir  string
+}
+
+// NewRunner creates a hook runner for an executable script path.
+func NewRunner(path string, dir string) Runner {
+	return Runner{path: path, dir: dir}
+}
+
+// Run executes the hook and passes change counts through environment variables.
+func (r Runner) Run(ctx context.Context, result syncer.Result) error {
+	if r.path == "" {
+		return nil
+	}
+
+	cmd := exec.CommandContext(ctx, r.path)
+	cmd.Dir = r.dir
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	cmd.Env = append(os.Environ(),
+		"S3WATCH_CHANGED="+strconv.FormatBool(result.Changed()),
+		"S3WATCH_DOWNLOADED="+strconv.Itoa(result.Downloaded),
+		"S3WATCH_UPLOADED="+strconv.Itoa(result.Uploaded),
+		"S3WATCH_UPDATED="+strconv.Itoa(result.Updated),
+		"S3WATCH_DELETED="+strconv.Itoa(result.Deleted),
+		"S3WATCH_UNCHANGED="+strconv.Itoa(result.Unchanged),
+	)
+
+	if err := cmd.Run(); err != nil {
+		return fmt.Errorf("executing %q: %w", r.path, err)
+	}
+	return nil
+}