#+PROPERTY: header-args:emacs-lisp :results silent
#+PROPERTY: header-args:emacs-lisp :tangle tangle/init-exwm.el

* Starting EXWM
Either start exwm in =.xinitrc= or if using a display manager setup a desktop file similar to this:
#+HEADER: :tangle /sudo::/usr/share/xsessions/exwm.desktop
#+begin_src conf
[Desktop Entry]
Name=EXWM
Comment=Emacs X Window Manager
TryExec=exwm-start
Exec=exwm-start
Type=Application
#+end_src
With the =exwm-start= script:
#+HEADER: :tangle /sudo::/usr/local/bin/exwm-start
#+begin_src shell :tangle-mode (identity #o755)
#!/usr/bin/env sh

export VISUAL=emacsclient
export EDITOR="$VISUAL"

# exec dbus-launch --exit-with-session emacs --eval "(progn (load \"/home/fpi/git/projects/dotfiles/tangle/init-exwm.el\") (exwm-enable))"
# exec dbus-launch --exit-with-session emacs
gpg-agent --daemon
export SSH_AUTH_SOCK=$(gpgconf --list-dirs agent-ssh-socket)

# exec dbus-launch --exit-with-session /home/fpi/.local/bin/emacs
export DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
exec /home/fpi/.local/bin/emacs
#+end_src
* EXWM config
#+begin_src emacs-lisp
(use-package exwm
  :straight t)
#+end_src
When starting the client from .xinitrc, `save-buffer-kill-terminal' will
force-kill Emacs before it can run through `kill-emacs-hook'.
#+BEGIN_SRC emacs-lisp
(global-set-key (kbd "C-x C-c") 'save-buffers-kill-emacs)
#+END_SRC

set keyboard
#+BEGIN_SRC emacs-lisp
(shell-command "setxkbmap -layout \"de(neo),us,ru,de\"")
#+END_SRC

** Monitor setup
#+BEGIN_SRC emacs-lisp
(use-package exwm-randr
  :config
  (setq exwm-randr-workspace-output-plist
        (when (equal fpi/current-device "pan") '(0 "DisplayPort-4" 1 "DisplayPort-6")))
  ;; (when (equal system-name "pan")
  ;;   (start-process-shell-command "xrandr" nil "xrandr --output DisplayPort-0 --off --output DisplayPort-1 --off --output DisplayPort-2 --off --output HDMI-A-0 --off --output DisplayPort-3 --mode 2560x1440 --pos 0x612 --rotate normal --output DisplayPort-4 --off --output DisplayPort-5 --mode 2560x1440 --pos 2560x0 --rotate right --output DisplayPort-6 --off")
  ;;   (exwm-workspace-add))
  (exwm-randr-enable))
#+END_SRC
** functions
#+BEGIN_SRC emacs-lisp
(defun ambrevar/switch-to-last-buffer ()
  "Switch to last open buffer in current window."
  (interactive)
  (switch-to-buffer (other-buffer (current-buffer) 1)))

(defun ambrevar/toggle-window-dedicated ()
  "Toggle whether the current active window is dedicated or not.
Run it in each window you want to 'freeze', i.e. prevent Emacs
from acting on it."
  (interactive)
  (message
   (if (let ((window (get-buffer-window (current-buffer))))
         (set-window-dedicated-p window
                                 (not (window-dedicated-p window))))
       "Window '%s' is dedicated"
     "Window '%s' is normal")
   (current-buffer)))

(defun ambrevar/toggle-window-split ()
  "Switch between vertical and horizontal split.
It only works for frames with exactly two windows."
  (interactive)
  (if (= (count-windows) 2)
      (let* ((this-win-buffer (window-buffer))
             (next-win-buffer (window-buffer (next-window)))
             (this-win-edges (window-edges (selected-window)))
             (next-win-edges (window-edges (next-window)))
             (this-win-2nd (not (and (<= (car this-win-edges)
                                         (car next-win-edges))
                                     (<= (cadr this-win-edges)
                                         (cadr next-win-edges)))))
             (splitter
              (if (= (car this-win-edges)
                     (car (window-edges (next-window))))
                  'split-window-horizontally
                'split-window-vertically)))
        (delete-other-windows)
        (let ((first-win (selected-window)))
          (funcall splitter)
          (if this-win-2nd (other-window 1))
          (set-window-buffer (selected-window) this-win-buffer)
          (set-window-buffer (next-window) next-win-buffer)
          (select-window first-win)
          (if this-win-2nd (other-window 1))))))

(defun ambrevar/toggle-single-window ()
  "Un-maximize current window.
If multiple windows are active, save window configuration and
delete other windows.  If only one window is active and a window
configuration was previously save, restore that configuration."
  (interactive)
  (if (= (count-windows) 1)
      (when single-window--last-configuration
        (set-window-configuration single-window--last-configuration))
    (setq single-window--last-configuration (current-window-configuration))
    (delete-other-windows)))
#+END_SRC
*** Window swapping
#+BEGIN_SRC emacs-lisp
(defun ambrevar/swap-windows (&optional w1 w2)
  "If 2 windows are up, swap them.
Else if W1 is a window, swap it with current window.
If W2 is a window too, swap both."
  (interactive)
  (unless (or (= 2 (count-windows))
              (windowp w1)
              (windowp w2))
    (error "Ambiguous window selection"))
  (let* ((w1 (or w1 (car (window-list))))
         (w2 (or w2
                 (if (eq w1 (car (window-list)))
                     (nth 1 (window-list))
                   (car (window-list)))))
         (b1 (window-buffer w1))
         (b2 (window-buffer w2))
         (s1 (window-start w1))
         (s2 (window-start w2)))
    (with-temp-buffer
      ;; Some buffers like EXWM buffers can only be in one live buffer at once.
      ;; Switch to a dummy buffer in w2 so that we don't display any buffer twice.
      (set-window-buffer w2 (current-buffer))
      (set-window-buffer w1 b2)
      (set-window-buffer w2 b1))
    (set-window-start w1 s2)
    (set-window-start w2 s1))
  (select-window w1))

(defun ambrevar/swap-windows-left ()
  "Swap current window with the window to the left."
  (interactive)
  (ambrevar/swap-windows (window-in-direction 'left)))
(defun ambrevar/swap-windows-below ()
  "Swap current window with the window below."
  (interactive)
  (ambrevar/swap-windows (window-in-direction 'below)))
(defun ambrevar/swap-windows-above ()
  "Swap current window with the window above."
  (interactive)
  (ambrevar/swap-windows (window-in-direction 'above)))
(defun ambrevar/swap-windows-right ()
  "Swap current window with the window to the right."
  (interactive)
  (ambrevar/swap-windows (window-in-direction 'right)))
#+END_SRC
*** Volume & Brightness
#+BEGIN_SRC emacs-lisp
(defun exwm-brightness (incdec)
  (shell-command (concat "xbacklight " incdec "10"))
  (notifications-notify :title (substring (shell-command-to-string "xbacklight") 0 -1)
			:replaces-id 6969
			:urgency 'low
			:timeout 550))

(defun exwm-volume (incdec)
  (notifications-notify
   :title (format
	   "Volume %s"
	   (substring
	    (shell-command-to-string
	     (format "amixer -D pulse set Master 5%%%s|tail -n 1|cut -d '[' -f 2|cut -d ']' -f 1"
		     incdec)) 0 -1))
   :replaces-id 6968
   :urgency 'low
   :timeout 550))
(defun exwm-togglemute ()
  (interactive)
  (notifications-notify
   :title (format
	   "Volume %s"
	   (substring
	    (shell-command-to-string
	     "amixer -D pulse set Master toggle|tail -n 1|cut -d '[' -f 3|cut -d ']' -f 1") 0 -1))
   :replaces-id 6968
   :urgency 'low
   :timeout 550))
#+END_SRC
*** XF86 Multimedia keys
#+BEGIN_SRC emacs-lisp
(defun exwm-xf86audio (cmd)
  ;; Control Spotify
  (shell-command (concat "dbus-send --type=method_call --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player." cmd)))
#+END_SRC
*** Browser switching
#+BEGIN_SRC emacs-lisp
(defun fpi/helm-exwm-switch (class &optional program other-window)
  "Switch to some EXWM windows belonging to CLASS.
If current window is not showing CLASS, switch to the last open CLASS window.
If there is none, start PROGRAM.

If PROGRAM is nil, it defaults to CLASS.
With prefix argument or if OTHER-WINDOW is non-nil, open in other window."
  ;; If current window is not in `exwm-mode' we switch to it.  Therefore we must
  ;; also make sure that current window is not a Helm buffer, otherwise calling
  ;; this function will lose focus in Helm.
  (unless helm-alive-p
    (setq program (or program class)
          other-window (or other-window current-prefix-arg))
    (let ((filter (lambda ()
                    (member (downcase (or exwm-class-name "")) class))))
      (if (and (eq major-mode 'exwm-mode)
               (funcall filter))
          (let ((helm-buffer-details-flag nil))
            (helm-exwm filter))
	(let ((last (buffer-list)))
          (while (and last
                      (not (with-current-buffer (car last)
                             (and (eq major-mode 'exwm-mode)
                                  (funcall filter)))))
            (setq last (cdr last)))
          (if last
              (funcall (if other-window 'switch-to-buffer-other-window 'switch-to-buffer) (car last))
            (when other-window (select-window (split-window-sensibly)))
            (start-process-shell-command program nil program)))))))

(defun fpi/helm-exwm-switch-browser ()
  "Switch to some `browse-url-generic-program' windows.

See `helm-exwm-switch'."
  (interactive)
  (fpi/helm-exwm-switch (quote ("qutebrowser"
				"firefox"))
			browse-url-generic-program))
#+END_SRC
** config
Time & Battery display
#+BEGIN_SRC emacs-lisp
(display-time)
(when (eq (fpi/current-device-info :type) 'mobile)
  (display-battery-mode))
#+END_SRC
Rename buffer to window title.\\
Spotify's title does not include "spotify" while playing music so just
append it.
#+BEGIN_SRC emacs-lisp
(defun fpie/exwm-rename-buffer-to-title ()
  (let ((newname (if (string-match "Spotify" (buffer-name))
		     (concat exwm-title " - Spotify")
		   exwm-title)))
    (exwm-workspace-rename-buffer newname)))

(add-hook 'exwm-update-title-hook 'fpie/exwm-rename-buffer-to-title)
#+END_SRC
#+BEGIN_SRC emacs-lisp
(add-hook 'exwm-floating-setup-hook 'exwm-layout-hide-mode-line)
(add-hook 'exwm-floating-exit-hook 'exwm-layout-show-mode-line)
#+END_SRC

Non-floating resizing with mouse
#+BEGIN_SRC emacs-lisp
(setq window-divider-default-bottom-width 2
      window-divider-default-right-width 2)
(window-divider-mode)
#+END_SRC
System tray
#+BEGIN_SRC emacs-lisp
(use-package exwm-systemtray
  :straight exwm)
(exwm-systemtray-enable)
(setq exwm-systemtray-height 16)
#+END_SRC
+auto focus+
#+BEGIN_SRC emacs-lisp :tangle no
(setq mouse-autoselect-window t
      focus-follows-mouse t)
#+END_SRC
List all buffers
#+BEGIN_SRC emacs-lisp
(setq exwm-workspace-show-all-buffers t)
(setq exwm-layout-show-all-buffers t)
#+END_SRC
*** Helm
#+BEGIN_SRC emacs-lisp :results silent
(with-eval-after-load 'helm
  ;; Need `with-eval-after-load' here since 'helm-map is not defined in 'helm-config.
  (define-key helm-map (kbd "s-\\") 'helm-toggle-resplit-and-swap-windows)
  (exwm-input--set-key (kbd "s-p") 'helm-run-external-command)
  (exwm-input-set-key (kbd "s-c") 'helm-resume)
  (exwm-input-set-key (kbd "s-b") 'helm-mini)
  (exwm-input-set-key (kbd "s-f") 'helm-find-files)
  (exwm-input-set-key (kbd "s-F") 'helm-locate)
  ;;(when (fboundp 'ambrevar/helm-locate-meta)
  ;;  (exwm-input-set-key (kbd "s-F") #'ambrevar/helm-locate-meta))
  ;;(exwm-input-set-key (kbd "s-g") 'ambrevar/helm-grep-git-or-ag)
  ;;(exwm-input-set-key (kbd "s-G") 'ambrevar/helm-grep-git-all-or-ag)
  )

(use-package helm-exwm
  :straight t)
(exwm-input-set-key (kbd "s-w") #'fpi/helm-exwm-switch-browser)
(exwm-input-set-key (kbd "s-W") #'helm-exwm-switch-browser-other-window)
#+END_SRC
*** Keys
Global bindings
#+BEGIN_SRC emacs-lisp
(exwm-input-set-key (kbd "s-K") #'exwm-reset)
(exwm-input-set-key (kbd "s-x") #'exwm-input-toggle-keyboard)

(exwm-input-set-key (kbd "s-s") #'windmove-left)
(exwm-input-set-key (kbd "s-n") #'windmove-down)
(exwm-input-set-key (kbd "s-r") #'windmove-up)
(exwm-input-set-key (kbd "s-t") #'windmove-right)

(exwm-input-set-key (kbd "s-B") #'ibuffer-list-buffers)
(exwm-input-set-key (kbd "s-X") #'kill-this-buffer)

(exwm-input-set-key (kbd "s-M") #'exwm-workspace-switch)

(exwm-input-set-key (kbd "s-\\") 'ambrevar/toggle-window-split)
(exwm-input-set-key (kbd "s-S") 'ambrevar/swap-windows-left)
(exwm-input-set-key (kbd "s-N") 'ambrevar/swap-windows-below)
(exwm-input-set-key (kbd "s-R") 'ambrevar/swap-windows-above)
(exwm-input-set-key (kbd "s-T") 'ambrevar/swap-windows-right)

(exwm-input-set-key (kbd "s-<tab>") #'ambrevar/switch-to-last-buffer)
(exwm-input-set-key (kbd "s-<return>") #'vterm)
(exwm-input-set-key (kbd "S-s-<return>") (lambda ()
					 (interactive)
					 (start-process "term" nil "tilix")))
(exwm-input-set-key (kbd "s-h") 'bury-buffer)

(exwm-input-set-key (kbd "s-g") 'previous-buffer)
(exwm-input-set-key (kbd "s-G") 'next-buffer)
#+END_SRC
#+BEGIN_SRC emacs-lisp
(exwm-input-set-key (kbd "s-!") 'helm-pass)
#+END_SRC
Volume & Brightness
#+BEGIN_SRC emacs-lisp
(exwm-input-set-key [XF86AudioLowerVolume] (lambda () (interactive) (exwm-volume "-")))
(exwm-input-set-key [XF86AudioRaiseVolume] (lambda () (interactive) (exwm-volume "+")))
(exwm-input-set-key [XF86AudioMute] 'exwm-togglemute)
(exwm-input-set-key [XF86MonBrightnessUp] (lambda () (interactive) (exwm-brightness "+")))
(exwm-input-set-key [XF86MonBrightnessDown] (lambda () (interactive) (exwm-brightness "-")))
#+END_SRC
XF86 Multimedia Keys
#+BEGIN_SRC emacs-lisp
(exwm-input--set-key [XF86AudioPlay] (lambda () (interactive) (exwm-xf86audio "PlayPause")))
(exwm-input--set-key [XF86AudioPause] (lambda () (interactive) (exwm-xf86audio "PlayPause")))
(exwm-input--set-key [XF86AudioNext] (lambda () (interactive) (exwm-xf86audio "Next")))
(exwm-input--set-key [XF86AudioPrev] (lambda () (interactive) (exwm-xf86audio "Previous")))
#+END_SRC
**** Local bindings
#+BEGIN_SRC emacs-lisp
(push ?\s-  exwm-input-prefix-keys)
(define-key exwm-mode-map (kbd "s-SPC") #'exwm-floating-toggle-floating)
(define-key exwm-mode-map (kbd "s-i") #'follow-delete-other-windows-and-split) ;; any useful?
(define-key exwm-mode-map (kbd "s-o") #'ambrevar/toggle-single-window)
(define-key exwm-mode-map (kbd "s-O") #'exwm-layout-toggle-fullscreen)

(define-key exwm-mode-map (kbd "C-q") #'exwm-input-send-next-key)
#+END_SRC
Allow access to my personal keymap.
#+BEGIN_SRC emacs-lisp
(push ?\C-z exwm-input-prefix-keys)
#+END_SRC

**** Simulation keys
#+BEGIN_SRC emacs-lisp
(setq exwm-input-simulation-keys
      '(([?\C-b] . [left])
        ([?\C-f] . [right])
        ([?\C-p] . [up])
        ([?\C-n] . [down])
        ([?\C-a] . [home])
        ([?\C-e] . [end])
        ([?\M-v] . [prior])
        ([?\C-v] . [next])
        ([?\C-d] . [delete])))
        ;;([?\C-k] . [S-end delete]))) ; doesn't work in tilix
#+END_SRC
*** Configure helm-raise-command
~(shell-command "emacsclient -e ...")~ does not work. Advice
~helm-run-or-raise~ instead and overshadow ~shell-command~.

For now ~helm-run-or-raise~ is redefined after helm is loaded in
~emacs-init.org~ instead of advised.
#+begin_src emacs-lisp
(defun fpi/get-proc-buffers (proc)
  (let ((cand (helm-exwm-candidates)))
    (remove
     nil (mapcar
	  (lambda (c)
	    (if (equal
		 (downcase proc)
		 (downcase (with-current-buffer c (or exwm-class-name ""))))
		c
	      nil)) cand))))
(defun fpi/switch-to-proc-buffer (proc)
  (switch-to-buffer (car (fpi/get-proc-buffers proc))))

;; (setq helm-raise-command "emacsclient -e '(fpi/switch-to-proc-buffer \"%s\")'")
(setq helm-raise-command t)
#+end_src
*** Screenshots
UncleDave has a nice exwm configuration in his [[https://github.com/daedreth/UncleDavesEmacs/blob/master/config.org][config]]. These snippets
are taken from there.

A nice alternative for screenshots in org-mode is ~org-screenshot.el~.
It uses ~scrot~ to take screenshots of windows and insert a link the
image into the current org buffer.

**** Screenshotting the entire screen
#+BEGIN_SRC emacs-lisp
  (defun daedreth/take-screenshot ()
    "Takes a fullscreen screenshot of the current workspace"
    (interactive)
    (when window-system
    (loop for i downfrom 3 to 1 do
          (progn
            (message (concat (number-to-string i) "..."))
            (sit-for 1)))
    (message "Cheese!")
    (sit-for 1)
    (start-process "screenshot" nil "import" "-window" "root" 
               (concat (getenv "HOME") "/" (subseq (number-to-string (float-time)) 0 10) ".png"))
    (message "Screenshot taken!")))
  (global-set-key (kbd "<print>") 'daedreth/take-screenshot)
#+END_SRC

**** Screenshotting a region
#+BEGIN_SRC emacs-lisp
(defun daedreth/take-screenshot-region ()
  "Takes a screenshot of a region selected by the user."
  (interactive)
  (when window-system
    (call-process "import" nil nil nil ".newScreen.png")
    (call-process "convert" nil nil nil ".newScreen.png" "-shave" "1x1"
                  (concat (getenv "HOME") "/" (subseq (number-to-string (float-time)) 0 10) ".png"))
    (call-process "rm" nil nil nil ".newScreen.png")))
;; (global-set-key (kbd "<Scroll_Lock>") 'daedreth/take-screenshot-region)
#+END_SRC