Change plugins behavior

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

plugins.go

@@ -0,0 +1,45 @@
+package spilltea
+
+import (
+	"embed"
+	"fmt"
+	"io/fs"
+	"os"
+	"path/filepath"
+)
+
+//go:embed plugins/*.lua
+var PluginsFS embed.FS
+
+// InstallDefaultPlugins copies embedded default plugins into dir, skipping
+// files that already exist. Returns the number of files written.
+func InstallDefaultPlugins(dir string) (int, error) {
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		return 0, fmt.Errorf("create plugins dir: %w", err)
+	}
+
+	entries, err := fs.ReadDir(PluginsFS, "plugins")
+	if err != nil {
+		return 0, err
+	}
+
+	written := 0
+	for _, e := range entries {
+		if e.IsDir() {
+			continue
+		}
+		dst := filepath.Join(dir, e.Name())
+		if _, err := os.Stat(dst); err == nil {
+			continue
+		}
+		data, err := PluginsFS.ReadFile("plugins/" + e.Name())
+		if err != nil {
+			return written, fmt.Errorf("read embedded %s: %w", e.Name(), err)
+		}
+		if err := os.WriteFile(dst, data, 0o644); err != nil {
+			return written, fmt.Errorf("write %s: %w", dst, err)
+		}
+		written++
+	}
+	return written, nil
+}