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How to highlight tabs in Emacs

I use spaces for indentation in source code, how can I highlight/mark tabs, that are in code?

It could be red, the same as when I use (setq-default show-trailing-whitespace t)

Solution

  • Just use command toggle-highlight-tabs from library highlight-chars.el.

    Or you can turn on tab highlighting by default by adding function hc-highlight-tabs to font-lock-mode-hook in your init file:

    (add-hook 'font-lock-mode-hook 'hc-highlight-tabs)

    You can turn on/off the highlighting provided by library Highlight Chars:

    • in the current buffer only (i.e., locally),
    • globally whenever Font Lock mode is enabled, or
    • automatically whenever a buffer is in a given major mode