chore(emacs): Move emacs config to tools/emacs

1 files changed, 103 insertions, 0 deletions

diff --git a/tools/emacs/init/nixos.el b/tools/emacs/init/nixos.el
new file mode 100644
index 000000000000..e384e9b77db8
--- /dev/null
+++ b/tools/emacs/init/nixos.el
@@ -0,0 +1,103 @@
+;; Configure additional settings if this is one of my NixOS machines
+;; (i.e. if ExWM is required)
+;; -*- lexical-binding: t; -*-
+
+(require 's)
+(require 'f)
+(require 'dash)
+
+(defun pulseaudio-ctl (cmd)
+  (shell-command (concat "pulseaudio-ctl " cmd))
+  (message "Volume command: %s" cmd))
+
+(defun volume-mute () (interactive) (pulseaudio-ctl "mute"))
+(defun volume-up () (interactive) (pulseaudio-ctl "up"))
+(defun volume-down () (interactive) (pulseaudio-ctl "down"))
+
+(defun brightness-up ()
+  (interactive)
+  (shell-command "exec light -A 10")
+  (message "Brightness increased"))
+
+(defun brightness-down ()
+  (interactive)
+  (shell-command "exec light -U 10")
+  (message "Brightness decreased"))
+
+(defun lock-screen ()
+  (interactive)
+  (shell-command "screen-lock"))
+
+(defun generate-randr-config ()
+  (-flatten `(,(-map (lambda (n) (list n "DP2")) (number-sequence 1 7))
+              (0 "eDP1")
+              ,(-map (lambda (n) (list n "eDP1")) (number-sequence 8 9)))))
+
+(use-package exwm
+  :hook ((exwm-update-class . (lambda ()
+                                ;; Make class name the buffer name
+                                (exwm-workspace-rename-buffer exwm-class-name))))
+  :init
+  (progn
+    (require 'exwm-config)
+
+    (fringe-mode 3)
+
+    (setq exwm-workspace-number 10)
+
+    ;; 's-r': Reset
+    (exwm-input-set-key (kbd "s-r") #'exwm-reset)
+    ;; 's-w': Switch workspace
+    (exwm-input-set-key (kbd "s-w") #'exwm-workspace-switch)
+    ;; 's-N': Switch to certain workspace
+    (dotimes (i 10)
+      (exwm-input-set-key (kbd (format "s-%d" i))
+                          `(lambda ()
+                             (interactive)
+                             (exwm-workspace-switch-create ,i))))
+
+    ;; Launch applications with completion (dmenu style!)
+    (exwm-input-set-key (kbd "s-d") #'ivy-run-external-command)
+    (exwm-input-set-key (kbd "s-p") #'ivy-password-store)
+    (exwm-input-set-key (kbd "C-s-p") '(lambda ()
+                                         (interactive)
+                                         (ivy-password-store "~/.aprila-secrets")))
+
+    ;; Add Alacritty selector to a key
+    (exwm-input-set-key (kbd "C-x t") #'counsel-switch-to-alacritty)
+
+    ;; 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)
+
+    ;; Line-editing shortcuts
+    (exwm-input-set-simulation-keys
+     '(([?\C-d] . delete)
+       ([?\C-w] . ?\C-c)))
+
+    ;; Enable EXWM
+    (exwm-enable)
+
+    ;; Show time in the mode line
+    (display-time-mode)
+
+    ;; Configure xrandr when running on laptop
+    (when (equal (shell-command-to-string "hostname") "adho\n")
+      (require 'exwm-randr)
+      (setq exwm-randr-workspace-output-plist (generate-randr-config))
+      (exwm-randr-enable))
+
+    ;; Let buffers move seamlessly between workspaces
+    (setq exwm-workspace-show-all-buffers t)
+    (setq exwm-layout-show-all-buffers t)))
+
+(provide 'nixos)