Don't apply whitespace cleanup to .tsv files

thoom-emacs/modules/thoom-tweaks.el

@@ -62,7 +62,13 @@
 (setq-default tab-width 4)
 (setq-default sentence-end-double-space nil)
 ;; automatically cleanup whitespace on save
-(add-hook 'before-save-hook 'whitespace-cleanup)
+(defun my-whitespace-cleanup ()
+  "Run `whitespace-cleanup' except for TSV files."
+  (unless (or (derived-mode-p 'text-mode) ; Adjust this check if necessary
+              (string-match "\\.tsv\\'" buffer-file-name))
+    (whitespace-cleanup)))
+
+(add-hook 'before-save-hook 'my-whitespace-cleanup)
 
 ;; clean up backup file spam
 (setq backup-directory-alist `(("." . "~/.saves"))