Add pulsar to config

README.org

@@ -1079,7 +1079,10 @@ let
       <<emacs-rustic-package>>
       <<emacs-plantuml-package>>
       <<emacs-protobuf-package>>
+
+      # User interface packages.
       <<emacs-swiper-package>>
+      <<emacs-pulsar-package>>
       <<emacs-desktop-package>>
       <<emacs-doom-themes-package>>
       <<emacs-doom-modeline-package>>
@@ -1158,6 +1161,7 @@ When Emacs is started, it normally tries to load a Lisp program from an ititiali
 
 ;; User interface.
 <<emacs-swiper-elisp>>
+<<emacs-pulsar-elisp>>
 <<emacs-transparency-elisp>>
 <<emacs-doom-themes-elisp>>
 <<emacs-doom-modeline-elisp>>
@@ -2460,6 +2464,21 @@ epkgs.ivy-prescient
 (ivy-prescient-mode +1)
 #+END_SRC
 
+** Pulsar
+
+#+NAME: emacs-pulsar-package
+#+BEGIN_SRC nix
+epkgs.pulsar
+#+END_SRC
+
+[[https://protesilaos.com/emacs/pulsar][Pulsar]] is a simple package that temporarily highlights the current line after a given function is invoked. It's built on the =pulse.el= library which is included with core [[https://gnu.org/software/emacs/][GNU/Emacs]].
+
+#+NAME: emacs-pulsar-elisp
+#+BEGIN_SRC emacs-lisp
+(require 'pulsar)
+(pulsar-setup
+#+END_SRC
+
 ** Transparency
 
 It's possible to control the frame opacity in [[https://gnu.org/software/emacs/][GNU/Emacs]]. Unlike other transparency hacks, it's not merely showing the desktop background image, but is true transparency -- you can see other windows behind the Emacs window.

modules/emacs.nix

@@ -55,11 +55,14 @@ let
       epkgs.rustic
       epkgs.plantuml-mode
       epkgs.protobuf-mode
+
+      # User interface packages.
       epkgs.ivy
       epkgs.counsel
       epkgs.ivy-rich
       epkgs.ivy-posframe
       epkgs.ivy-prescient
+      epkgs.pulsar
       epkgs.desktop-environment
       epkgs.doom-themes
       epkgs.doom-modeline