ui/treemacs: refactor & activate treemacs-git-mode

modules/ui/treemacs/config.el

@@ -1,19 +1,48 @@
 ;;; ui/treemacs/config.el -*- lexical-binding: t; -*-
 
+(defvar +treemacs-git-mode 'simple
+  "Type of git integration for `treemacs-git-mode'.
+
+There are 3 possible values:
+
+  1) `simple', which highlights only files based on their git status, and is
+     slightly faster,
+  2) `extended', which highlights both files and directories, but requires
+     python,
+  3) `deferred', same as extended, but highlights asynchronously.
+
+This must be set before `treemacs' has loaded.")
+
+
+;;
+;;; Packages
+
+(use-package! treemacs
+  :defer t
+  :init
   (setq treemacs-follow-after-init t
         treemacs-is-never-other-window t
         treemacs-sorting 'alphabetic-case-insensitive-asc
         treemacs-persist-file (concat doom-cache-dir "treemacs-persist")
         treemacs-last-error-persist-file (concat doom-cache-dir "treemacs-last-error-persist"))
+  :config
+  ;; Allow ace-window to target treemacs windows
+  (after! ace-window
+    (delq! 'treemacs-mode aw-ignored-buffers))
 
-
-(after! treemacs
   ;; Don't follow the cursor
   (treemacs-follow-mode -1)
 
-  ;; Allow ace-window to target treemacs windows
-  (after! ace-window
-    (delq! 'treemacs-mode aw-ignored-buffers)))
+  (when +treemacs-git-mode
+    ;; If they aren't supported, fall back to simpler methods
+    (when (and (memq +treemacs-git-mode '(deferred extended))
+               (not (executable-find "python3")))
+      (setq +treemacs-git-mode 'simple))
+    (treemacs-git-mode +treemacs-git-mode)
+    (setq treemacs-collapse-dirs
+          (if (memq treemacs-git-mode '(extended deferred))
+              3
+            0))))
 
 
 (use-package! treemacs-evil