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Window numbers for Emacs !

Introduction

Window numbers for Emacs: Navigate your windows and frames using numbers !

This package is an extended and actively maintained version of the https://github.com/nschum/window-numbering.el package by Nikolaj Schumacher, with some ideas and code taken from https://github.com/abo-abo/ace-window.

This version brings, among other things, support for number sets across multiple frames, giving the user a smoother experience of multi-screen Emacs.

Installation

  • Clone the repo:
  cd /path/to/install/folder
  git clone https://github.com/deb0ch/winum.el
  • Add the following to your Emacs configuration:
  (add-to-list 'load-path "/path/to/install/folder/winum.el/")

  (require 'winum)

  (winum-mode)

How to use

Key binding Description
C-x w <n> select window <n>, where <n> ranges from 0 to 9. A negative argument deletes the window.
C-x w ` select window by number. Number can be given as prefix arg or will be read from minibuffer.
  • select-window-0-or-10 By default, C-x w 0 is bound to =select-window-0-or-10=c. If window 0 is not assigned, it will act on the window 10 instead. You can rebind this to the more straightforward select-window-0 if you prefer.
  • select-window-by-number

    If you happen to have more than 10 windows, you can use the select-window-by-number function, bound by default to C-x w `.

    This function allows several ways to input the window number:

    • Use a numbered prefix argument.
      Ex: C-1 C-2 C-x w ` to select window 12.
    • Use a negative prefix argument to delete the window.
      Ex: C-- C-1 C-2 C-x w ` to delete window 12.
    • Use the negative prefix argument to delete window 0.
      Ex: C-- C-x w ` to delete window 0.
    • Use the default prefix argument to delete current window.
      Ex: C-u C-x w ` to delete current window.
    • If no prefix argument ig given, a number is read from minibuffer. A negative input will delete the window instead of selecting it.

Configuration

Keybindings

By default, all key bindings are prefixed with a value stored in winum-keymap-prefix, by default C-x w. See Customize options.

The default prefix is C-x w for compatibility with common Emacs bindings. If you prefer no to use a prefix and have shorter key bindings, you can also override winum-keymap before activating winum-mode:

  (require 'winum)

  (setq winum-keymap
        (let ((map (make-sparse-keymap)))
          (define-key map (kbd "C-`") 'winum-select-window-by-number)
          (define-key map (kbd "M-0") 'winum-select-window-0-or-10)
          (define-key map (kbd "M-1") 'winum-select-window-1)
          (define-key map (kbd "M-2") 'winum-select-window-2)
          (define-key map (kbd "M-3") 'winum-select-window-3)
          (define-key map (kbd "M-4") 'winum-select-window-4)
          (define-key map (kbd "M-5") 'winum-select-window-5)
          (define-key map (kbd "M-6") 'winum-select-window-6)
          (define-key map (kbd "M-7") 'winum-select-window-7)
          (define-key map (kbd "M-8") 'winum-select-window-8)
          map))

  (winum-mode)

Customize options

Several options are available through Emacs' Customize interface under convenience > winum:

  • winum-keymap-prefix Prefix key sequence for keybindings. Default: (kbd "C-x w")
  • winum-scope Frames affected by a number set. Choices are 'frame-local 'visible or 'global. Default: 'global
  • winum-reverse-frame-list If t, order frames by reverse order of creation. Has effect only when winum-scope is not 'frame-local. Default: nil
  • winum-auto-assign-0-to-minibuffer If non-nil, winum-mode assigns 0 to the minibuffer if active. Default: t
  • winum-assign-func Function called for each window by winum-mode. This is called before automatic assignment begins. The function should return a number to have it assigned to the current-window, nil otherwise. Default: nil Example: always assign Calculator the number 9 and NeoTree the number 0:
  (defun my-winum-assign-func ()
    (cond
     ((equal (buffer-name) "*Calculator*")
      9)
     ((string-match-p (buffer-name) ".*\\*NeoTree\\*.*")
      0)
     (t
      nil)))

  (setq winum-assign-func 'my-winum-assign-func)
  • winum-auto-setup-mode-line When nil, winum-mode will not display window numbers in the mode-line. You might want this to be nil if you use a package that already manages window numbers in the mode-line. Default: t
  • winum-mode-line-position The position in the mode-line winum-mode displays the number. Default: 1
  • winum-ignored-buffers List of buffers to ignore when selecting window. Default: '(" which-key")
  • face: winum-face Face used for the number in the mode-line.

Configuration file example

Here is an example that you could put in your .emacs, which includes all available winum options.

  (add-to-list 'load-path "/path/to/install/folder/winum.el/")

  (require 'winum)

  (defun my-winum-assign-func ()
    (cond
     ((equal (buffer-name) "*Calculator*")
      9)
     ((string-match-p (buffer-name) ".*\\*NeoTree\\*.*")
      0)
     (t
      nil)))

  (set-face-property 'winum-face :weight 'bold)

  (setq window-numbering-scope            'global
        winum-reverse-frame-list          nil
        winum-auto-assign-0-to-minibuffer t
        winum-assign-func                 'my-winum-assign-func
        winum-auto-setup-mode-line        t
        winum-mode-line-position          1
        winum-ignored-buffers             '(" *which-key*")
        winum-keymap (let ((map (make-sparse-keymap)))
                       (define-key map (kbd "C-`") 'select-window-by-number)
                       (define-key map (kbd "M-0") 'select-window-0-or-10)
                       (define-key map (kbd "M-1") 'select-window-1)
                       (define-key map (kbd "M-2") 'select-window-2)
                       (define-key map (kbd "M-3") 'select-window-3)
                       (define-key map (kbd "M-4") 'select-window-4)
                       (define-key map (kbd "M-5") 'select-window-5)
                       (define-key map (kbd "M-6") 'select-window-6)
                       (define-key map (kbd "M-7") 'select-window-7)
                       (define-key map (kbd "M-8") 'select-window-8)
                       (define-key map (kbd "M-9") 'select-window-9)
                       map))

  (winum-mode)