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My friend and I collaborate on a C++ project and we agree to use 4 whiltespaces for indentation. I am using Emacs and this is my indentation setting

(setq-default c-basic-offset 4) 

By doing this, I believe that I can use tab safely without pressing the space bar for 4 or 8 or 12 times. However, my friends (Eclipse user) and I see awkwardly indented (misaligned) code in our own code editor. Then we accuse each other for using tabs instead of 4 whitespaces.

How can I find the ground truth in our cpp file? We want to know who introduces \t to our code.

We use svn for source control and do not have a nice UI for code review. So I prefer to check this \t character locally.

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First of all you should set the default value of indent-tabs-mode to nil. Either toggle it off with customize or put the following lisp code into your init file.

(setq-default indent-tabs-mode nil)

You can check for tabs in a file with M-x white-space-mode in its buffer. Tabs are indicated with » when that mode is active.

If you want to prominently highlight tabs permanently you can use the following code from emacswiki in your init file.

;; Draw tabs with the same color as trailing whitespace  
(add-hook 'font-lock-mode-hook  
      (lambda ()  
        (font-lock-add-keywords  
         nil  
         '(("\t" 0 'trailing-whitespace prepend)))))

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