treemacs-init.el

(use-package treemacs
  ;;  :ensure t
  :defer 10
  :init
  (with-eval-after-load 'winum
    (define-key winum-keymap (kbd "M-0") #'treemacs-select-window))
  :config
  (progn
    (setq treemacs-collapse-dirs              (if (executable-find "python") 3 0)
          treemacs-deferred-git-apply-delay   0.5
          treemacs-display-in-side-window     t
          treemacs-file-event-delay           5000
          treemacs-file-follow-delay          0.2
          treemacs-follow-after-init          t
          treemacs-follow-recenter-distance   0.1
          treemacs-goto-tag-strategy          'refetch-index
          treemacs-indentation                2
          treemacs-indentation-string         " "
          treemacs-is-never-other-window      nil
          treemacs-no-png-images              nil
          treemacs-project-follow-cleanup     nil
          treemacs-persist-file               (expand-file-name ".cache/treemacs-persist" user-emacs-directory)
          treemacs-recenter-after-file-follow nil
          treemacs-recenter-after-tag-follow  nil
          treemacs-recenter-after-project-jump   'always
          treemacs-recenter-after-project-expand 'on-distance
          treemacs-show-hidden-files          t
          treemacs-silent-filewatch           nil
          treemacs-silent-refresh             nil
          treemacs-sorting                    'alphabetic-desc
          treemacs-space-between-root-nodes   t
          treemacs-tag-follow-cleanup         t
          treemacs-tag-follow-delay           1.5
          treemacs-position                   'left
          treemacs-user-mode-line-format      nil
          treemacs-width                      60)

    ;; 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 t)
    (pcase (cons (not (null (executable-find "git")))
                 (not (null (executable-find "python3"))))
      (`(t . t)
       (treemacs-git-mode 'extended))
      (`(t . _)
       (treemacs-git-mode 'simple))))
  (global-set-key (kbd "S-<f8>") 'treemacs)
  (global-set-key (kbd "A-0") 'treemacs-select-window)
  :bind
  (:map global-map
        ("A-t 0"   . treemacs-select-window)
        ("A-t 1"   . treemacs-delete-other-windows)
        ("A-t t"   . treemacs)
        ;; ("S-f8"   . treemacs)
        ("A-t B"   . treemacs-bookmark)
        ("A-t C-t" . treemacs-find-file)
        ("A-t M-t" . treemacs-find-tag)
        ))

(use-package treemacs-evil
  :after (treemacs evil)
  ;;:ensure t
  )

(use-package treemacs-projectile
  :after (treemacs projectile)
  ;;  :ensure nil
  :config
  (setq treemacs-header-function #'treemacs-projectile-create-header)
  :bind (([M-f8] . treemacs-projectile)
         :map projectile-command-map
         ("h" . treemacs-projectile)))

(use-package treemacs-icons-dired
  :after (treemacs dired)
  ;;  :ensure t
  :config (treemacs-icons-dired-mode))

(use-package treemacs-magit
  :after (treemacs magit)
  ;;:ensure t
  )

(use-package treemacs-persp
  :after (treemacs persp-mode)
  ;;:ensure t
  :config (treemacs-set-scope-type 'Perspectives))