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user9474
Asked: 2010-04-14 10:19:50 +0800 CST

How to check if Emacs is in GUI mode (and execute `tool-bar-mode` only then)?

  • 772

I have this line in my .emacs file:

(tool-bar-mode 0)

because I hate the toolbars in my GUI emacs (/Applications/Emacs.app/Contents/MacOS/Emacs).

But when I start up my other, text-based emacs in the terminal (/opt/local/bin/emacs) it complains about that command:

Symbol's function definition is void: tool-bar-mode

How can I add an if condition so that it executes the tool-bar-mode command only when I'm in the GUI emacs?

Thanks!

mac-osx emacs

4 Answers

  1. Okay, found it myself. Just add 

    ;; turn off toolbar
(if window-system
    (tool-bar-mode 0))
    • 23

  2. another way to do it would be:

     (if (functionp 'tool-bar-mode) (tool-bar-mode 0))

    like this, the function is called only if it exists

    • 3

  3. It works for me without complaint on Linux. You might try nil or -1 instead of 0:

    (tool-bar-mode nil)

    What happens if you do emacs -nw?

    • 0

  4. Use of the window-system variable as a boolean is deprecated. Instead, use display-graphic-p or any of the other display-*-p predicates which report frame’s specific UI-related capabilities.

    In case you want your code to be backward-compatible with the previous versions of Emacs, then the following compatibility wrapper is the way to go:

    (if (< emacs-major-version 23)
    (or window-system (getenv "DISPLAY"))
  (display-graphic-p))
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