* NEWS.org (Added): Announce the new style. * style/lineno.el: New file.
diff --git a/NEWS.org b/NEWS.org
index cd9f3f515ed..d9f9ba209d8 100644
--- a/NEWS.org
+++ b/NEWS.org
@@ -11,7 +11,7 @@
** Added
-- Add new support files =style/lua-unicode-math.el=,
+- Add new support files =style/lineno.el=, =style/lua-unicode-math.el=,
=style/sourcesans.el= and =style/sourceserif.el=.
** Changed
diff --git a/style/lineno.el b/style/lineno.el
new file mode 100644
index 00000000000..c93dac8e4e1
--- /dev/null
+++ b/style/lineno.el
@@ -0,0 +1,126 @@
+;;; lineno.el --- AUCTeX style for `lineno.sty' (v5.9) -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2026 Free Software Foundation, Inc.
+
+;; Author: Arash Esbati <arash@gnu.org>
+;; Maintainer: auctex-devel@gnu.org
+;; Created: 2026-06-05
+;; Keywords: tex
+
+;; This file is part of AUCTeX.
+
+;; AUCTeX is free software; you can redistribute it and/or modify it
+;; under the terms of the GNU General Public License as published by the
+;; Free Software Foundation; either version 3, or (at your option) any
+;; later version.
+
+;; AUCTeX is distributed in the hope that it will be useful, but WITHOUT
+;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+;; for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This file adds support for `lineno.sty' (v5.9) from 2026-03-08.
+;; `lineno.sty' is part of TeXLive.
+
+;;; Code:
+
+(require 'tex)
+(require 'latex)
+
+;; Silence the compiler:
+(declare-function font-latex-add-keywords "font-latex" (keywords class))
+
+(TeX-add-style-hook
+ "lineno"
+ (lambda ()
+ (TeX-add-symbols
+ ;; 3.2 How to turn on line numbering
+ '("linenumbers" ["Number"])
+ '("linenumbers*")
+
+ ;; 3.3 How to turn off line numbering
+ "nolinenumbers"
+
+ ;; 4.1 Running line numbers
+ "setrunninglinenumbers"
+
+ ;; 4.1.1 Reseting or setting the line number
+ '("resetlinenumber" ["Number"])
+
+ '("runninglinenumbers" ["Number"])
+ '("runninglinenumbers*" )
+
+ ;; 4.2 Pagewise line numbers
+ "setpagewiselinenumbers"
+ "pagewiselinenumbers"
+
+ ;; 4.2.1 Margin switching
+ "switchlinenumbers"
+ "switchlinenumbers*"
+
+ ;; 4.2.2 Running mode with margin switching1
+ "runningpagewiselinenumbers"
+ "realpagewiselinenumbers"
+
+ ;; 4.3 Margin selection
+ "leftlinenumbers" "leftlinenumbers*"
+ "rightlinenumbers" "rightlinenumbers*"
+
+ ;; 4.6 Numbering only one in five lines
+ '("modulolinenumbers" ["Number"])
+
+ ;; 4.7 How the line numbers look like
+ "linenumberfont"
+ "thelinenumber"
+
+ ;; 5 Line number references
+ '("linelabel" TeX-arg-define-label))
+
+ (LaTeX-add-environments
+ ;; 3.2 How to turn on line numbering
+ '("linenumbers" ["Number"])
+ '("linenumbers*")
+
+ ;; 4.1 Running line numbers
+ '("runninglinenumbers" ["Number"])
+ '("runninglinenumbers*")
+
+ ;; 4.2 Pagewise line numbers
+ '("pagewiselinenumbers"))
+
+ ;; 4.7 How the line numbers look like
+ (LaTeX-add-lengths "linenumbersep")
+
+ ;; Fontification
+ (when (and (featurep 'font-latex)
+ (eq TeX-install-font-lock 'font-latex-setup))
+ (font-latex-add-keywords '(("linenumbers" "*[")
+ ("resetlinenumber" "[")
+ ("runninglinenumbers" "*[")
+ ("switchlinenumbers" "*")
+ ("leftlinenumbers" "*")
+ ("rightlinenumbers" "*")
+ ("modulolinenumbers" "["))
+ 'function)
+ (font-latex-add-keywords '("nolinenumbers"
+ "setrunninglinenumbers"
+ "setpagewiselinenumbers"
+ "pagewiselinenumbers"
+ "runningpagewiselinenumbers"
+ "realpagewiselinenumbers")
+ 'function-noarg)
+ (font-latex-add-keywords '(("linelabel" "{"))
+ 'reference)))
+ TeX-dialect)
+
+(defvar LaTeX-lineno-package-options
+ '("left" "right" "switch" "switch*" "pagewise" "running"
+ "modulo" "mathline" "displaymath")
+ "Package options for the lineno package.")
+
+;;; lineno.el ends here
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