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I have rust-mode installed on my Emacs 24.4. The tab indentation I have is 2 whitespaces, however in Rust mode it's different. I want to setup the tab indentation size for rust-mode, how can I do that?

And actually, not only for rust mode, for other languages such as Python too.

UPDATE:

Or I think it's better for me to setup it globally regardless of the setting for each **-mode package.

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Reset to default
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In general, you can do something like this:

(add-hook '<foo>-mode-hook (lambda () (setq tab-width 4)))

If you have a single global default you prefer:

(setq-default tab-width <number you like>)
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  • what's "a single global default "?
    – Oskar K.
    Commented May 7, 2016 at 7:05
  • If you do C-h v tab-width <RET>, you'll see, "automatically becomes buffer-local when set." This means that a variable (in this case, tab-width) has a default, base value, and expects to be overwritten on a per-buffer basis. For instance: the vanilla emacs default for tab-width is 8 spaces. In my configs, I have (setq-default tab-width 4) (because 8 is silly), but then in my JavaScript configs I have a hook that sets tab-width to 2 spaces.
    – Gastove
    Commented May 7, 2016 at 17:14

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