Port configuration from programming module

config.el

@@ -65,6 +65,9 @@
                         :inherit avy-lead-face)
       `(avy-lead-face-2 :foreground ,avy-lead-face-2-fg
                         :inherit avy-lead-face))))
+(after! symbol-overlay
+  (custom-theme-set-faces! nil
+    '(symbol-overlay-default-face :inherit hl-line)))
 
 ;; This determines the style of line numbers in effect. If set to `nil', line
 ;; numbers are disabled. For relative line numbers, set this to `relative'.
@@ -233,10 +236,20 @@
         :desc "VTerm"                       "t" #'+vterm/other-window
         :desc "VTerm (same window)"         "T" #'+vterm/here)))
 
+;; Tab key should indent and absolutely nothing more.
+(after! yasnippet
+  (map! (:map yas-minor-mode-map
+         "<tab>"      nil
+         "TAB"        nil
+         "<C-return>" #'yas-expand)))
+
 ;; -----------------------------------------------------------------------------
 ;; Configuration for additional packages on top of doom and its modules.
 ;; -----------------------------------------------------------------------------
 
+;; Nicer box comments.
+(use-package! box-comments
+  :bind (("C-x C-'" . +x-box-comment/box-comment)))
 
 ;; A nicer interface for ripgrep. Note that since doom required rg we don't
 ;; consider the case if it's not installed.
@@ -253,12 +266,26 @@
                  "Open the result in other window without changing to it."
                  (interactive)
                  (save-selected-window (deadgrep-visit-result-other-window)))
-         "<RET>" #'deadgrep-visit-result-other-window)))
+         "RET" #'deadgrep-visit-result-other-window)))
 
 ;; Duplicate things.
 (use-package! duplicate-thing
   :bind (("M-C" . duplicate-thing)))
 
+;; Navigate betweeon occurences of the same symbol.
+(use-package! symbol-overlay
+  :bind (("M-RET" . symbol-overlay-put)
+         ("M-n" . symbol-overlay-switch-forward)
+         ("M-p" . symbol-overlay-switch-backward)
+         ("<C-M-return>" . symbol-overlay-remove-all))
+  :hook (prog-mode . symbol-overlay-mode)
+  :config
+  ;; Since we're reusing colours from orderless which only has four faces.
+  (setq symbol-overlay-faces '(orderless-match-face-0
+                               orderless-match-face-1
+                               orderless-match-face-2
+                               orderless-match-face-3)))
+
 ;; It's the 21st century, a file explorer should be pretty.
 (use-package! treemacs-icons-dired
   :after dired
@@ -274,6 +301,13 @@
 (use-package! x-lib
   :defer t)
 
+;; Load `yank-indent' without deferring.
+(use-package! yank-indent
+  :config
+  (advice-add 'yank :after #'+x-yank-indent-a)
+  (advice-add 'yank-pop :after #'+x-yank-indent-a)
+  (advice-add 'consult-yank-pop :after #'+x-yank-indent-a))
+
 ;; -----------------------------------------------------------------------------
 ;; Global configuration.
 ;; -----------------------------------------------------------------------------
@@ -309,6 +343,8 @@
 (defalias #'end-of-visual-line #'end-of-line)
 (defalias #'beginning-of-visual-line #'beginning-of-line)
 
+;; Enable the fill column indicator.
+(add-hook 'prog-mode-hook #'display-fill-column-indicator-mode)
 
 ;; -----------------------------------------------------------------------------
 ;; Global keybindings.

packages.el

@@ -12,10 +12,13 @@
   :recipe (:local-repo "repos/x-lib"))
 (package! deadgrep)
 (package! duplicate-thing)
+(package! symbol-overlay)
 (package! treemacs-icons-dired)
 (package! whole-line-or-region)
 (package! x-lib
   :recipe (:local-repo "repos/x-lib"))
+(package! yank-indent
+  :recipe (:local-repo "repos/x-lib"))
 
 ;; To install a package directly from a remote git repo, you must specify a
 ;; `:recipe'. You'll find documentation on what `:recipe' accepts here: