Add olivetti to Emacs to center certain buffers

home-manager/software/emacs/default.nix

@@ -61,6 +61,7 @@
       epkgs.move-text
       epkgs.multi-vterm
       epkgs.nix-mode
+      epkgs.olivetti
       epkgs.parsebib
       epkgs.pdf-tools
       epkgs.perspective

home-manager/software/emacs/emacs.d/lib/olivetti.el

@@ -0,0 +1,4 @@
+(use-package olivetti
+  :hook (markdown-mode . olivetti-mode)
+  :config
+  (setq olivetti-body-width 89))

home-manager/software/emacs/emacs.d/modules.el

@@ -20,6 +20,7 @@
 (load-file (modules-path "langtool.el"))
 (load-file (modules-path "markdown.el"))
 (load-file (modules-path "move_text.el"))
+(load-file (modules-path "olivetti.el"))
 (load-file (modules-path "pdf_tools.el"))
 (load-file (modules-path "spellcheck.el"))