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+;; -*- lexical-binding: t; -*-
+;;
+;; Configure desktop environment settings, including both
+;; window-management (EXWM) as well as additional system-wide
+;; commands.
+
+(require 's)
+(require 'f)
+(require 'dash)
+(require 'exwm)
+(require 'exwm-config)
+(require 'exwm-randr)
+(require 'exwm-systemtray)
+
+(defun pactl (cmd)
+  (shell-command (concat "pactl " cmd))
+  (message "Volume command: %s" cmd))
+
+(defun volume-mute () (interactive) (pactl "set-sink-mute @DEFAULT_SINK@ toggle"))
+(defun volume-up () (interactive) (pactl "set-sink-volume @DEFAULT_SINK@ +5%"))
+(defun volume-down () (interactive) (pactl "set-sink-volume @DEFAULT_SINK@ -5%"))
+
+(defun brightness-up ()
+  (interactive)
+  (shell-command "xbacklight -inc 5")
+  (message "Brightness increased"))
+
+(defun brightness-down ()
+  (interactive)
+  (shell-command "xbacklight -dec 5")
+  (message "Brightness decreased"))
+
+(defun lock-screen ()
+  (interactive)
+  ;; A sudoers configuration is in place that lets me execute this
+  ;; particular command without having to enter a password.
+  ;;
+  ;; The reason for things being set up this way is that I want
+  ;; xsecurelock.service to be started as a system-wide service that
+  ;; is tied to suspend.target.
+  (shell-command "/usr/bin/sudo /usr/bin/systemctl start xsecurelock.service"))
+
+(defun set-xkb-layout (layout)
+  "Set the current X keyboard layout."
+
+  (shell-command (format "setxkbmap %s" layout))
+  (message "Set X11 keyboard layout to '%s'" layout))
+
+(defun create-window-name ()
+  "Construct window names to be used for EXWM buffers by
+  inspecting the window's X11 class and title.
+
+  A lot of commonly used applications either create titles that
+  are too long by default, or in the case of web
+  applications (such as Cider) end up being constructed in
+  awkward ways.
+
+  To avoid this issue, some rewrite rules are applied for more
+  human-accessible titles."
+
+  (pcase (list (or exwm-class-name "unknown") (or exwm-title "unknown"))
+    ;; In Cider windows, rename the class and keep the workspace/file
+    ;; as the title.
+    (`("Google-chrome" ,(and (pred (lambda (title) (s-ends-with? " - Cider" title))) title))
+     (format "Cider<%s>" (s-chop-suffix " - Cider" title)))
+
+    ;; Attempt to detect IRCCloud windows via their title, which is a
+    ;; combination of the channel name and network.
+    ;;
+    ;; This is what would often be referred to as a "hack". The regexp
+    ;; will not work if a network connection buffer is selected in
+    ;; IRCCloud, but since the title contains no other indication that
+    ;; we're dealing with an IRCCloud window
+    (`("Google-chrome"
+       ,(and (pred (lambda (title)
+                     (s-matches? "^[\*\+]\s#[a-zA-Z0-9/\-]+\s\|\s[a-zA-Z\.]+$" title)))
+             title))
+     (format "IRCCloud<%s>" title))
+
+    ;; For other Chrome windows, make the title shorter.
+    (`("Google-chrome" ,title)
+     (format "Chrome<%s>" (s-truncate 42 (s-chop-suffix " - Google Chrome" title))))
+
+    ;; Gnome-terminal -> Term
+    (`("Gnome-terminal" ,title)
+     ;; fish-shell buffers contain some unnecessary whitespace and
+     ;; such before the current working directory. This can be
+     ;; stripped since most of my terminals are fish shells anyways.
+     (format "Term<%s>" (s-trim-left (s-chop-prefix "fish" title))))
+
+    ;; For any other application, a name is constructed from the
+    ;; window's class and name.
+    (`(,class ,title) (format "%s<%s>" class (s-truncate 12 title)))))
+
+;; EXWM launch configuration
+;;
+;; This used to use use-package, but when something breaks use-package
+;; it doesn't exactly make debugging any easier.
+
+(let ((titlef (lambda ()
+                (exwm-workspace-rename-buffer (create-window-name)))))
+  (add-hook 'exwm-update-class-hook titlef)
+  (add-hook 'exwm-update-title-hook titlef))
+
+(fringe-mode 3)
+(exwm-enable)
+
+;; 's-N': Switch to certain workspace
+(setq exwm-workspace-number 10)
+(dotimes (i 10)
+  (exwm-input-set-key (kbd (format "s-%d" i))
+                      `(lambda ()
+                         (interactive)
+                         (exwm-workspace-switch-create ,i))))
+
+;; Launch applications / any command  with completion (dmenu style!)
+(exwm-input-set-key (kbd "s-d") #'counsel-linux-app)
+(exwm-input-set-key (kbd "s-x") #'ivy-run-external-command)
+(exwm-input-set-key (kbd "s-p") #'ivy-password-store)
+
+;; Add X11 terminal selector to a key
+(exwm-input-set-key (kbd "C-x t") #'ts/switch-to-terminal)
+
+;; Toggle between line-mode / char-mode
+(exwm-input-set-key (kbd "C-c C-t C-t") #'exwm-input-toggle-keyboard)
+
+;; Volume keys
+(exwm-input-set-key (kbd "<XF86AudioMute>") #'volume-mute)
+(exwm-input-set-key (kbd "<XF86AudioRaiseVolume>") #'volume-up)
+(exwm-input-set-key (kbd "<XF86AudioLowerVolume>") #'volume-down)
+
+;; Brightness keys
+(exwm-input-set-key (kbd "<XF86MonBrightnessDown>") #'brightness-down)
+(exwm-input-set-key (kbd "<XF86MonBrightnessUp>") #'brightness-up)
+(exwm-input-set-key (kbd "<XF86Display>") #'lock-screen)
+
+;; Shortcuts for switching between keyboard layouts
+(defmacro bind-xkb (lang key)
+  `(exwm-input-set-key (kbd (format "s-%s" ,key))
+                       (lambda ()
+                         (interactive)
+                         (set-xkb-layout ,lang))))
+
+(bind-xkb "us" "k u")
+(bind-xkb "de" "k d")
+(bind-xkb "no" "k n")
+(bind-xkb "ru" "k r")
+
+;; These are commented out because Emacs no longer starts (??) if
+;; they're set at launch.
+;;
+;; (bind-xkb "us" "л г")
+;; (bind-xkb "de" "л в")
+;; (bind-xkb "no" "л т")
+;; (bind-xkb "ru" "л к")
+
+;; Line-editing shortcuts
+(exwm-input-set-simulation-keys
+ '(([?\C-d] . delete)
+   ([?\C-w] . ?\C-c)))
+
+;; Show time & battery status in the mode line
+(display-time-mode)
+(display-battery-mode)
+
+;; enable display of X11 system tray within Emacs
+(exwm-systemtray-enable)
+
+;; Configure xrandr (multi-monitor setup).
+;;
+;; This makes some assumptions about how my machines are connected to
+;; my home setup during the COVID19 isolation period.
+
+(defun set-randr-config (screens)
+  (setq exwm-randr-workspace-monitor-plist
+        (-flatten (-map (lambda (screen)
+                          (-map (lambda (screen-id) (list screen-id (car screen))) (cdr screen)))
+                        screens))))
+
+;; Layouts for Vauxhall (laptop)
+
+(defun randr-vauxhall-layout-single ()
+  "Laptop screen only!"
+  (interactive)
+  (set-randr-config '(("eDP1" (number-sequence 0 9))))
+  (shell-command "xrandr --output eDP1 --auto --primary")
+  (shell-command "xrandr --output HDMI1 --off")
+  (shell-command "xrandr --output DP2 --off")
+  (exwm-randr-refresh))
+
+(defun randr-vauxhall-layout-all ()
+  "Use all screens at home."
+  (interactive)
+  (set-randr-config
+   '(("eDP1" 0)
+     ("HDMI1" 1 2 3 4 5)
+     ("DP2" 6 7 8 9)))
+
+  (shell-command "xrandr --output HDMI1 --right-of eDP1 --auto --primary")
+  (shell-command "xrandr --output DP2 --right-of HDMI1 --auto")
+  (exwm-randr-refresh))
+
+(defun randr-vauxhall-layout-wide-only ()
+  "Use only the wide screen at home."
+  (interactive)
+  (set-randr-config
+   '(("eDP1" 8 9 0)
+     ("HDMI1" 1 2 4 5 6 7)))
+
+  (shell-command "xrandr --output DP2 --off")
+  (shell-command "xrandr --output HDMI1 --right-of eDP1 --auto --primary")
+  (exwm-randr-refresh))
+
+;; Layouts for frog (desktop)
+
+(defun randr-frog-layout-right-only ()
+  "Use only the right screen on frog."
+  (interactive)
+  (set-randr-config `(("DP-1" ,(number-sequence 0 9))))
+  (shell-command "xrandr --output DP-2 --off")
+  (shell-command "xrandr --output DP-1 --auto --primary"))
+
+(defun randr-frog-layout-both ()
+  "Use the left and right screen on frog."
+  (interactive)
+  (set-randr-config `(("DP-2" 1 2 3 4 5)
+                      ("DP-1" 6 7 8 9 0)))
+
+  (shell-command "xrandr --output DP-2 --auto --primary --left-of DP-1")
+  (shell-command "xrandr --output DP-1 --auto --right-of DP-2"))
+
+(pcase (s-trim (shell-command-to-string "hostname"))
+  ("vauxhall"
+   (exwm-input-set-key (kbd "s-m s") #'randr-vauxhall-layout-single)
+   (exwm-input-set-key (kbd "s-m a") #'randr-vauxhall-layout-all)
+   (exwm-input-set-key (kbd "s-m w") #'randr-vauxhall-layout-wide-only))
+
+  ("frog"
+   (exwm-input-set-key (kbd "s-m b") #'randr-frog-layout-both)
+   (exwm-input-set-key (kbd "s-m r") #'randr-frog-layout-right-only)))
+
+(exwm-randr-enable)
+
+;; Let buffers move seamlessly between workspaces by making them
+;; accessible in selectors on all frames.
+(setq exwm-workspace-show-all-buffers t)
+(setq exwm-layout-show-all-buffers t)
+
+(provide 'desktop)