Window numbers for Emacs !

• Contents
• Introduction
• Installation
• How to use
• Configuration
  • Keybindings
  • Customize options
  • Configuration file example

Contents   TOC

• Introduction
• Installation
• How to use

• Configuration

  • Keybindings
  • Customize options
  • Configuration file example

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 native Emacs bindings. However, it gives long key bindings and can be incomfortable to use.

For instance, you can replace the native prefix with C-c or M-m.

If you prefer no to use a prefix to have even shorter bindings, you can also directly override winum-keymap:

  (require 'winum)

  (setcdr (assoc 'winum-mode minor-mode-map-alist)
      (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)

This is a little bit hacky but is less code than using define-key, and will also shadow the old bindings.

NB: the ` key is convenient on qwerty keyboards, however if you are using a different keyboard you should replace it with the key beside 1. For instance, ² on an azerty keyboard.

Customize options

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

• 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")
• winum-keymap-prefix Prefix key sequence for keybindings. Default: (kbd "C-x w")
• 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)

  (setcdr (assoc 'winum-mode minor-mode-map-alist)
      (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))

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

  (set-face-attribute 'winum-face nil :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-prefix               nil)

  (winum-mode)