Emacs: Set tab indent for just one file on the fly

Question

I work on an open source project where the creator sets his tab-indents to 2 spaces.

I\'d like to just enable it on the fly for the one file I work on and not other fil

Answer 1

I use a snippet of code in my init.el that tries to auto-detect files that use 2-space indents, and switch Emacs's indentation for that file to 2 spaces when it sees such files:

(add-hook 'js-mode-hook
          (lambda ()
            (when (string-match-p "^  [A-Za-z]" (buffer-string))
              (make-variable-buffer-local 'js-indent-level)
              (set-variable 'js-indent-level 2))))