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Programming in Emacs Lisp

16.6 Indent Tabs Mode

By default, Emacs inserts tabs in place of multiple spaces when it formats a region. (For example, you might indent many lines of text all at once with the indent-region command.) Tabs look fine on a terminal or with ordinary printing, but they produce badly indented output when you use TeX or Texinfo since TeX ignores tabs.

The following turns off Indent Tabs mode:

;;; Prevent Extraneous Tabs (setq-default indent-tabs-mode nil)

Note that this line uses setq-default rather than the setq command that we have seen before. The setq-default command sets values only in buffers that do not have their own local values for the variable.

See section `Tabs vs. Spaces' in The GNU Emacs Manual.

See section `Local Variables in Files' in The GNU Emacs Manual.