gnu: Add emacs-outli.

* gnu/packages/emacs-xyz.scm (emacs-outli): New variable.

Change-Id: If1a082000f8105829ca9e0ecbedee1da4201bf40
Signed-off-by: Andreas Enge <andreas@enge.fr>

gnu/packages/emacs-xyz.scm

@@ -157,6 +157,7 @@
 ;;; Copyright © 2025 Cayetano Santos <csantosb@inventati.org>
 ;;; Copyright © 2025 Lee Thompson <lee.p.thomp@gmail.com>
 ;;; Copyright @ 2025 Amy Pillow <amypillow@lavache.com>
+;;; Copyright © 2025 Kurome <hunt31999@gmail.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -25899,6 +25900,32 @@ programming-mode, and special action has to be taken to switch to the
 text-mode (i.e. Org-mode).")
       (license license:gpl3+))))
 
+(define-public emacs-outli
+  (package
+    (name "emacs-outli")
+    (version "0.2.3")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/jdtsmith/outli")
+                    (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "01q37gbfc0mal3ha2x5a1axdcd2c0d55imav4w0cfzs3sm48azvs"))))
+    (build-system emacs-build-system)
+    (arguments (list #:tests? #f))      ; no tests
+    (home-page "https://github.com/jdtsmith/outli")
+    (synopsis "Simple and stylish comment-based outliner for Emacs")
+    (description "This package provides @code{outli-mode}, a minimal and elegant
+outliner for Emacs that enhances @code{outline-minor-mode} with configurable
+heading syntax, styled headings, and org-mode-inspired navigation and structure
+editing.  It supports comment-based headers with customizable stems and repeat
+characters, styled overlines and backgrounds, tab-based visibility toggling,
+org-style speed keys for headline manipulation, and imenu integration for fast
+navigation.")
+    (license license:gpl3+)))
+
 (define-public emacs-outshine
   (let ((commit "bf1eed10dd7a89b63d0fc014944033db397c1e23")
         (revision "1"))