Add treemacs with some sensible default config

README.org

@@ -359,6 +359,55 @@ Loading this file is handled automatically on my [[https://git.xenia.me.uk/xenia
     (diff-hl-disable-on-remote t)
     (diff-hl-draw-borders nil))
 #+end_src
+
+** Treemacs
+#+begin_src emacs-lisp
+  (use-package treemacs
+    :ensure t
+    :defer t
+    :config
+    ;; The default width and height of the icons is 22 pixels. If you are
+    ;; using a Hi-DPI display, uncomment this to double the icon size.
+    ;;(treemacs-resize-icons 44)
+
+    (treemacs-follow-mode t)
+    (treemacs-filewatch-mode t)
+    (treemacs-fringe-indicator-mode 'always)
+    (when treemacs-python-executable
+      (treemacs-git-commit-diff-mode t))
+
+    (pcase (cons (not (null (executable-find "git")))
+                 (not (null treemacs-python-executable)))
+      (`(t . t)
+       (treemacs-git-mode 'deferred))
+      (`(t . _)
+       (treemacs-git-mode 'simple)))
+
+    (treemacs-hide-gitignored-files-mode nil)
+    :bind
+    ("M-0"       . treemacs-select-window)
+    ("C-x t 1"   . treemacs-delete-other-windows)
+    ("C-x t t"   . treemacs)
+    ("C-x t d"   . treemacs-select-directory)
+    ("C-x t B"   . treemacs-bookmark)
+    ("C-x t C-t" . treemacs-find-file)
+    ("C-x t M-t" . treemacs-find-tag))
+
+  ;; (use-package treemacs-icons-dired
+  ;;   :hook (dired-mode . treemacs-icons-dired-enable-once)
+  ;;   :ensure t)
+
+  (use-package treemacs-magit
+    :after (treemacs magit)
+    :ensure t)
+
+  (use-package treemacs-nerd-icons
+    :after (treemacs nerd-icons)
+    :ensure t
+    :config
+    (treemacs-load-theme "nerd-icons"))
+#+end_src
+
 * Org-mode
 For reference information, see [[https://orgmode.com][Org-mode website]]