#+TITLE: Window numbers for Emacs !

[[https://github.com/syl20bnr/spacemacs][file:https://cdn.rawgit.com/syl20bnr/spacemacs/442d025779da2f62fc86c2082703697714db6514/assets/spacemacs-badge.svg]] [[https://melpa.org/#/winum][file:https://melpa.org/packages/winum-badge.svg]]

* Contents :TOC:
 - [[#introduction][Introduction]]
 - [[#installation][Installation]]
   - [[#using-melpa][Using Melpa]]
   - [[#manual-installation][Manual installation]]
 - [[#how-to-use][How to use]]
 - [[#configuration][Configuration]]
   - [[#keybindings][Keybindings]]
   - [[#customize-options][Customize options]]
   - [[#configuration-file-example][Configuration file example]]
 - [[#future-developments][Future developments]]

* 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][window-numbering]] package by Nikolaj Schumacher, with some ideas and code taken
from [[https://github.com/abo-abo/ace-window][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
** Using Melpa
The recommended way of installing =winum= is from the [[https://melpa.org/#/winum][Melpa]] package repository:

#+BEGIN_SRC emacs-lisp
M-x package-install RET winum RET
#+END_SRC

You will find instructions to setup Melpa [[https://github.com/melpa/melpa#usage][here]] if you don't have it setup yet.

Once the package is installed, you will need to activate =winum-mode= in your
Emacs configuration:

#+BEGIN_SRC emacs-lisp
  (require 'winum)

  (winum-mode)
#+END_SRC

** Manual installation
- Clone the repo:

#+BEGIN_SRC shell
  cd /path/to/install/folder
  git clone https://github.com/deb0ch/winum.el
#+END_SRC

- Add the following to your Emacs configuration:

#+BEGIN_SRC emacs-lisp
  (add-to-list 'load-path "/path/to/install/folder/winum.el/")

  (require 'winum)

  (winum-mode)
#+END_SRC

* 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=. 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][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 could 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=:

#+BEGIN_SRC emacs-lisp
  (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)
#+END_SRC

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.

  This function along with `winum-auto-assign-0-to-minibuffer' are the only ways
  to have 0 assigned to a window.

  Example: always assign *Calculator* the number 9 and *NeoTree* the number 0:

#+BEGIN_SRC emacs-lisp
  (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)
#+END_SRC

  Default: =nil=

- =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 assigning numbers.

  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.

#+BEGIN_SRC emacs-lisp
  (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)
#+END_SRC

* Future developments
- send buffer to numbered window

  Send current window's buffer to window N. With prefix argument focus will
  follow.

  Also provide a `winum-send-buffer-to-window-by-number` function (and find
  shorter names).

- swap buffer with numbered window

  Same as previous, but will swap buffers instead of just sending them.

  Also provide a `winum-swap-buffre-with-window-by-number` function (and find
  better names).

- Evilify

  Adapt the package to the famous `evil-mode` and use a leader key.

- Override native =other-window= (~C-x o~) to use window numbers

- Autocomplete read-from-minibuffer

- Feel free to submit any issue or a pull request, including the above
  mentionned points :)