Evil mode and latex support

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+;;; titlesec.el --- AUCTeX style for `titlesec.sty' (v2.11)  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2016--2022 Free Software Foundation, Inc.
+
+;; Author: Arash Esbati <arash@gnu.org>
+;; Maintainer: auctex-devel@gnu.org
+;; Created: 2015-09-19
+;; 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 AUCTeX; see the file COPYING.  If not, write to the Free
+;; Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+;; 02110-1301, USA.
+
+;;; Commentary:
+
+;; This file adds support for `titlesec.sty' (v2.11) from
+;; 2019/07/16.  `titlesec.sty' is part of TeXLive.
+
+;;; Code:
+
+(require 'tex)
+(require 'latex)
+
+;; Silence the compiler:
+(declare-function font-latex-add-keywords
+                  "font-latex"
+                  (keywords class))
+
+(defvar LaTeX-titlesec-key-val-options
+  '(("page" ("even" "odd"))
+    ("numberless"))
+  "Key=value options for \"\\titleformat\" and \"\\titlespacing\"
+macros provided by \"titlesec.sty\".")
+
+(defvar LaTeX-titlesec-section-command-list
+  '("part"
+    "chapter"
+    "section"
+    "subsection"
+    "subsubsection"
+    "paragraph"
+    "subparagraph")
+  "List of sectioning commands available in \"titlesec.sty\".")
+
+(defvar LaTeX-titlesec-section-shape-list
+  '("hang"
+    "block"
+    "display"
+    "runin"
+    "leftmargin"
+    "rightmargin"
+    "drop"
+    "wrap"
+    "frame")
+  "List of sectioning shapes available for \"\\titleformat\" command.")
+
+(defun LaTeX-titlesec-section-command-list ()
+  "Remove \"chapter\" from variable
+`LaTeX-titlesec-section-command-list' and return the remainder.
+Removal is based on the return value of function
+`LaTeX-largest-level'.  Items returned are prefixed with
+`TeX-esc'."
+  (mapcar (lambda (elt) (concat TeX-esc elt))
+          (if (< (LaTeX-largest-level) 2)
+              (symbol-value 'LaTeX-titlesec-section-command-list)
+            (remove "chapter" LaTeX-titlesec-section-command-list))))
+
+(defun LaTeX-arg-titlesec-titlespec (optional)
+  "Insert the first argument of \"\\titleformat\" and \"\\titlespacing\".
+Depending on returned value of function `LaTeX-largest-level',
+append a \"name\" key with corresponding values to
+`LaTeX-titlesec-key-val-options'.  The values are retrieved from
+`LaTeX-titlesec-section-command-list'.  The values of this list
+are also added stand-alone as keys.  If OPTIONAL is non-nil,
+insert the argument in brackets."
+  (let ((keyvals
+         (TeX-read-key-val
+          optional
+          (append
+           `(("name"
+              ,(mapcar (lambda (elt) (concat TeX-esc elt))
+                       (if (< (LaTeX-largest-level) 2)
+                           (symbol-value 'LaTeX-titlesec-section-command-list)
+                         (remove "chapter" LaTeX-titlesec-section-command-list)))))
+           (mapcar #'list
+                   (mapcar (lambda (elt) (concat TeX-esc elt))
+                           (if (< (LaTeX-largest-level) 2)
+                               (symbol-value 'LaTeX-titlesec-section-command-list)
+                             (remove "chapter" LaTeX-titlesec-section-command-list))))
+           LaTeX-titlesec-key-val-options)
+          "Sectioning command")))
+    (TeX-argument-insert keyvals optional)))
+
+(TeX-add-style-hook
+ "titlesec"
+ (lambda ()
+
+   ;; Load "titleps.el" when "pagestyles" package option is given
+   (when (LaTeX-provided-package-options-member "titlesec" "pagestyles")
+     (TeX-run-style-hooks "titleps"))
+
+   (TeX-add-symbols
+    ;; 2.4. Tools
+    '("titlelabel" t)
+
+    ;; \titleformat*{<command>}{<format>}
+    '("titleformat*" (LaTeX-arg-titlesec-titlespec) t)
+
+    ;; 3. Advanced Interface
+    ;; \titleformat{<command>}[<shape>]{<format>}{<label>}{<sep>}{<before-code>}[<after-code>]
+    '("titleformat"
+      (LaTeX-arg-titlesec-titlespec)
+      [TeX-arg-eval completing-read
+                    (TeX-argument-prompt t nil "Shape")
+                    LaTeX-titlesec-section-shape-list]
+      (TeX-arg-conditional (y-or-n-p "With optional after-code? ")
+                           (4 [nil])
+                           (4)))
+
+    '("chaptertitlename" 0)
+
+    ;; 3.2. Spacing
+    ;; \titlespacing{<command>}{<left>}{<before-sep>}{<after-sep>}[<right-sep>]
+    '("titlespacing"
+      (LaTeX-arg-titlesec-titlespec)
+      (TeX-arg-length "Left margin")
+      (TeX-arg-length "Before vertical space")
+      (TeX-arg-length "Space between title and text")
+      [TeX-arg-length "Right margin"])
+
+    '("titlespacing*"
+      (LaTeX-arg-titlesec-titlespec)
+      (TeX-arg-length "Left margin")
+      (TeX-arg-length "Before vertical space")
+      (TeX-arg-length "Space between title and text")
+      [TeX-arg-length "Right margin"])
+
+    ;; 3.3. Spacing related tools
+    '("filright"  0)
+    '("filcenter" 0)
+    '("filleft"   0)
+    '("fillast"   0)
+    '("filinner"  0)
+    '("filouter"  0)
+    '("wordsep"   0)
+    '("nostruts"  0)
+
+    ;; 3.4. Rules
+    '("titleline"
+      [TeX-arg-eval completing-read
+                    (TeX-argument-prompt t nil "Alignment")
+                    '("l" "r" "c")]
+      t)
+
+    '("titlerule" [TeX-arg-length "Rule height"])
+
+    '("titlerule*" [TeX-arg-length "Box width"] "Text")
+
+    '("iftitlemeasuring" 2)
+
+    ;; 3.5. Page styles
+    '("assignpagestyle"
+      (TeX-arg-eval completing-read
+                    (TeX-argument-prompt nil nil "Sectioning command")
+                    (LaTeX-titlesec-section-command-list))
+      (TeX-arg-pagestyle))
+
+    ;; 3.9. Creating new levels and changing the class
+    '("titleclass"
+      (TeX-arg-eval completing-read
+                    (TeX-argument-prompt nil nil "Sectioning command")
+                    (LaTeX-titlesec-section-command-list))
+      (TeX-arg-eval completing-read
+                    (TeX-argument-prompt nil nil "Class")
+                    '("page" "top" "straight"))
+      [TeX-arg-eval completing-read
+                    (TeX-argument-prompt t nil "Super level command")
+                    (LaTeX-titlesec-section-command-list)]) )
+
+   ;; Don't increase indent at \iftitlemeasuring:
+   (add-to-list 'LaTeX-indent-begin-exceptions-list "iftitlemeasuring" t)
+   (LaTeX-indent-commands-regexp-make)
+
+   ;; 3.4. Rules: A variant of \titleline to be used only with calcwidth
+   (when (LaTeX-provided-package-options-member "titlesec" "calcwidth")
+     (TeX-add-symbols
+      '("titleline*"
+        (TeX-arg-eval completing-read
+                      (TeX-argument-prompt nil nil "Alignment")
+                      '("l" "r" "c"))
+        t)))
+
+   ;; The length of the longest line is returned in \titlewidth
+   (LaTeX-add-lengths "titlewidth"
+                      "titlewidthlast"
+                      "titlewidthfirst")
+
+   ;; Fontification: We only add macros which are used at top level;
+   ;; most of macros definded above are intended to be used in
+   ;; arguments of \titleformat
+   (when (and (featurep 'font-latex)
+              (eq TeX-install-font-lock 'font-latex-setup))
+     (font-latex-add-keywords '(("titlelabel"        "{")
+                                ;;
+                                ;; \titleformat comes in 2 flavors:
+                                ;; with *, it takes only 2 mandatory
+                                ;; argument; w/o *, a lot more.  It is
+                                ;; not (yet) possible to realize this
+                                ;; behaviour within font-latex.  Hence
+                                ;; we reduce the fontification to the
+                                ;; first 2 mandatory arguments and
+                                ;; ignore the rest.  *[ are optional anyway.
+                                ("titleformat"       "*{[{")
+                                ("titlespacing"      "*{{{{[")
+                                ("iftitlemeasuring"  "{{")
+                                ("assignpagestyle"   "{{")
+                                ("titleclass"        "{[{["))
+                              'function)))
+ TeX-dialect)
+
+(defvar LaTeX-titlesec-package-options
+  '(;; 2.1. Format
+    "rm" "sf" "tt" "md" "bf" "up" "it" "sl" "sc"
+    "big" "medium" "small" "tiny"
+    "raggedleft" "center" "raggedright"
+
+    ;; 2.2. Spacing
+    "compact"
+
+    ;; 2.3. Uppercase
+    "uppercase"
+
+    ;; 3.3. Spacing related tools
+    "indentafter"   "noindentafter"
+    "rigidchapters" "rubberchapters"
+    "bottomtitles"  "nobottomtitles" "nobottomtitles*"
+    "aftersep"      "largestsep"     "pageatnewline"
+    "nostruts"
+
+    ;; 3.4. Rules
+    "calcwidth"
+
+    ;; 3.7. Other Package Options
+    "explicit"
+    "newparttoc"
+    "oldparttoc"
+    "clearempty"
+    "toctitles"
+    "newlinetospace"
+    "loadonly"
+
+    ;; 5. titleps and Page Styles
+    "pagestyles")
+  "Package options for the titlesec package.")
+
+;;; titlesec.el ends here