chore: migrate mail themes to shared framework and locked upstream inputs

tools/cli/delete.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"path/filepath"
 
+	"gitea-mail-templates/tools/builder"
 	"github.com/urfave/cli/v2"
 )
 
@@ -34,12 +35,21 @@ func runDelete(c *cli.Context) error {
 	folder := c.String("folder")
 
 	for _, styleName := range names {
+		if !builder.ValidName(styleName) {
+			return fmt.Errorf("invalid theme name %q", styleName)
+		}
 		styleDir := filepath.Join(folder, styleName)
+		if info, err := os.Lstat(styleDir); err == nil && info.Mode()&os.ModeSymlink != 0 {
+			return fmt.Errorf("refusing to delete a theme symlink")
+		}
 
 		if _, err := os.Stat(styleDir); os.IsNotExist(err) {
 			fmt.Printf("\033[33m[W]\033[0m [CLI] '%s' does not exist, skipped\n", styleName)
 			continue
 		}
+		if _, err := builder.LoadTheme(styleDir); err != nil {
+			return fmt.Errorf("refusing to delete a non-theme directory: %w", err)
+		}
 
 		if err := os.RemoveAll(styleDir); err != nil {
 			return fmt.Errorf("cannot delete %s: %w", styleDir, err)