Evil mode and latex support

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+;;; beamer.el --- AUCTeX style for the latex-beamer class  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2003-2021  Free Software Foundation, Inc.
+
+;; Author: Thomas Baumann <thomas.baumann@ch.tum.de>
+;; Created: 2003-12-20
+;; 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 the latex-beamer class.
+
+;;; Code:
+
+(require 'tex)
+(require 'latex)
+
+;; Silence the compiler:
+(declare-function font-latex-add-keywords
+                  "font-latex"
+                  (keywords class))
+
+(defun LaTeX-beamer-after-insert-env (env start _end)
+  "Do beamer-specific stuff after the insertion of an environment."
+  ;; Add `fragile' as an optional argument to the frame environment if
+  ;; a verbatim environment is inserted.
+  (when (and (TeX-member env (LaTeX-verbatim-environments) #'string-equal)
+             (save-excursion
+               (goto-char start)
+               (string-equal (LaTeX-current-environment) "frame")))
+    (save-excursion
+      (when (re-search-backward "\\\\begin[ \t]*{frame}" nil t)
+        (let ((end-of-begin (match-end 0)))
+          (goto-char end-of-begin)
+          (while (forward-comment 1))
+          (if (eq (char-after) (string-to-char LaTeX-optop))
+              (progn
+                (forward-char)
+                (insert "fragile")
+                (unless (looking-at (concat "[ \t]*" LaTeX-optcl))
+                  (insert ",")))
+            (goto-char end-of-begin)
+            (insert "[fragile]")))))))
+
+(defvar LaTeX-beamer-frametitle-history nil
+  "History of frame titles in beamer.")
+
+(TeX-add-style-hook
+ "beamer"
+ (lambda ()
+   (add-hook 'LaTeX-after-insert-env-hook #'LaTeX-beamer-after-insert-env nil t)
+
+   (TeX-run-style-hooks "amsmath" "amssymb" "amsthm" "color" "geometry"
+                        "hyperref" "inputenc" "translator" "xcolor")
+
+   (unless LaTeX-beamer-section-labels-flag
+     (make-local-variable 'LaTeX-section-hook)
+     (setq LaTeX-section-hook
+           '(LaTeX-section-heading
+             LaTeX-section-title
+             LaTeX-section-section)))
+
+   (setq LaTeX-item-list
+         (append '(("itemize" . LaTeX-item-beamer)
+                   ("enumerate" . LaTeX-item-beamer))
+                 LaTeX-item-list))
+
+   (setq LaTeX-default-document-environment "frame")
+
+   (LaTeX-paragraph-commands-add-locally "frametitle")
+
+   (TeX-add-symbols
+    '("alert" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("alt" [ TeX-arg-beamer-overlay-spec ] 2)
+    '("beamerbutton" 1)
+    '("beamergotobutton" 1)
+    '("beamerreturnbutton" 1)
+    '("beamerskipbutton" 1)
+    '("frame" TeX-arg-beamer-frametitle)
+    '("frametitle"
+      (TeX-arg-eval TeX-read-string "Title: " nil 'LaTeX-beamer-frametitle-history))
+    '("hyperlink" [ TeX-arg-beamer-overlay-spec ] 2)
+    '("hyperlinkslideprev" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("hyperlinkslidenext" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("hyperlinkframestart" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("hyperlinkframeend" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("hyperlinkframestartnext" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("hyperlinkframeendprev" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("hyperlinkpresentationstart" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("hyperlinkpresentationend" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("hyperlinkappendixstart" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("hyperlinkappendixend" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("hyperlinkdocumentstart" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("hyperlinkdocumentend" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("hypertarget" [ TeX-arg-beamer-overlay-spec ] 2)
+    '("institute" 1)
+    '("invisible" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("label" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("logo" 1)
+    '("note" TeX-arg-beamer-note 1)
+    '("only" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("onslide" [ TeX-arg-beamer-overlay-spec ])
+    '("partpage")
+    '("pause" ["Slide number"])
+    '("structure" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("temporal" [ TeX-arg-beamer-overlay-spec ] 3)
+    '("titlepage")
+    '("titlegraphic" 1)
+    '("uncover" [ TeX-arg-beamer-overlay-spec ] 1)
+    '("usetheme" LaTeX-arg-beamer-theme)
+    '("useinnertheme" LaTeX-arg-beamer-inner-theme)
+    '("useoutertheme" LaTeX-arg-beamer-outer-theme)
+    '("usecolortheme" LaTeX-arg-beamer-color-theme)
+    '("usefonttheme" LaTeX-arg-beamer-font-theme)
+    '("usetheme" LaTeX-arg-beamer-theme)
+    '("visible" [ TeX-arg-beamer-overlay-spec ] 1))
+
+   (LaTeX-add-environments
+    '("actionenv")
+    '("alertblock" 1)
+    '("beamerboxesrounded" 1)
+    '("block" (lambda (env &rest ignore)
+                (LaTeX-insert-environment
+                 env (format "{%s}" (TeX-read-string "Title: ")))))
+    '("column" "Width")
+    "columns"
+    "columnsonlytextwidth"
+    '("exampleblock" 1)
+    '("frame"  (lambda (env &rest ignore)
+                 (let ((title (TeX-read-string "(Optional) Title: " nil
+                                               'LaTeX-beamer-frametitle-history)))
+                   (LaTeX-insert-environment env)
+                   (unless (zerop (length title))
+                     (save-excursion
+                       (LaTeX-find-matching-begin)
+                       (end-of-line)
+                       (LaTeX-newline)
+                       ;; Indent the next macro insertion and don't
+                       ;; rely on the fill-function to do it:
+                       (indent-according-to-mode)
+                       (insert (format "\\frametitle{%s}" title))
+                       ;; This works because \frametitle is a
+                       ;; paragraph command.
+                       (when auto-fill-function
+                         (backward-char)
+                         (LaTeX-fill-paragraph)))))))
+    '("onlyenv" (lambda (env &rest ignore)
+                  (LaTeX-insert-environment
+                   env
+                   (let ((overlay (TeX-read-string "(Optional) Overlay: ")))
+                     (unless (zerop (length overlay))
+                       (format "<%s>" overlay))))))
+    '("overlayarea" "Area width" "Area height")
+    '("overprint"  (lambda (env &rest ignore)
+                     (LaTeX-insert-environment
+                      env
+                      (let ((width (TeX-read-string "(Optional) Area width: ")))
+                        (unless (zerop (length width))
+                          (format "[%s]" width))))))
+    "semiverbatim")
+
+   (LaTeX-largest-level-set "section")
+   (LaTeX-add-counters "lecture" "part" "section" "subsection" "subsubsection"
+                       "subsectionslide" "framenumber" "figure" "table"
+                       "beamerpauses")
+   (LaTeX-add-pagestyles "navigation")
+   (add-to-list (make-local-variable 'LaTeX-indent-environment-list)
+                '("semiverbatim" current-indentation) t)
+   (add-to-list 'LaTeX-verbatim-environments-local "semiverbatim")
+
+   ;; Fontification
+   (when (and (featurep 'font-latex)
+              (eq TeX-install-font-lock 'font-latex-setup))
+     (font-latex-add-keywords '(("title" "[{")
+                                ("subtitle" "[{")
+                                ("author" "[{")
+                                ("date" "[{")
+                                ("frametitle" "<[{")) 'slide-title)))
+ TeX-dialect)
+
+(defun TeX-arg-beamer-overlay-spec (optional &optional prompt)
+  "Prompt for overlay specification.
+If OPTIONAL is non-nil, insert the specification only if
+non-empty and enclosed in \"<>\".  PROMPT replaces the standard
+one."
+  (let ((TeX-arg-opening-brace "<")
+        (TeX-arg-closing-brace ">"))
+    (TeX-argument-insert
+     (TeX-read-string
+      (TeX-argument-prompt optional prompt "Overlay"))
+     optional)
+    (indent-according-to-mode)))
+
+(defun TeX-arg-beamer-frametitle (_optional &optional _prompt)
+  "Prompt for the frametitle."
+  (let ((title (TeX-read-string "Title: " nil 'LaTeX-beamer-frametitle-history)))
+    (if (not (zerop (length title)))
+        (insert TeX-grop TeX-esc "frametitle" TeX-grop
+                title TeX-grcl TeX-grcl)
+      (insert TeX-grop TeX-grcl))))
+
+(defun LaTeX-item-beamer ()
+  "Insert a new item with an optional overlay argument. You
+can turn off the prompt for the overlay argument by setting
+`LaTeX-beamer-item-overlay-flag' to nil. Calling the function
+with a prefix argument prompts for the overlay specification
+unconditionally."
+  (if (listp current-prefix-arg)
+      (setq current-prefix-arg (car current-prefix-arg))
+    current-prefix-arg)
+  (TeX-insert-macro "item")
+  (delete-horizontal-space)
+  (if (or current-prefix-arg LaTeX-beamer-item-overlay-flag)
+      (TeX-arg-beamer-overlay-spec 0))
+  (insert " ")
+  (indent-according-to-mode))
+
+(defun TeX-arg-beamer-note (_optional &optional _prompt)
+  "Prompt for overlay specification and optional argument."
+  (let ((overlay (TeX-read-string "(Optional) Overlay: "))
+        (options (TeX-read-string "(Optional) Options: ")))
+    (unless (zerop (length overlay))
+      (insert "<" overlay ">"))
+    (unless (zerop (length options))
+      (insert "[" options "]"))
+    (indent-according-to-mode)))
+
+(defun LaTeX-beamer-search-themes (&optional regexp extensions length)
+  "Search for beamer themes matching REGEXP with EXTENSIONS.
+The function removes the first LENGTH characters and the
+extension of the file and returns a list of strings.  LENGTH may
+also be a string.  Then the length of the string is used."
+  (let* ((match (or regexp "^beamertheme[A-Z]"))
+         (exts  (or extensions '("tex" "sty")))
+         (chars (cond ((integerp length)
+                       length)
+                      ((stringp length)
+                       (string-width length))
+                      ;; Try some DWIM magic...
+                      ((and (not length)
+                            (string-match "beamer[A-Za-z0-9]*theme" match))
+                       (- (match-end 0) (match-beginning 0)))
+                      (t (error "Invalid length: `%s'" length)))))
+    ;; (message "match=`%s' chars=`%s'" match chars)
+    (TeX-delete-duplicate-strings
+     (delete nil
+             (mapcar
+              (lambda (file)
+                (let ((case-fold-search nil))
+                  (and (numberp (string-match match file))
+                       (substring file chars))))
+              (TeX-search-files nil exts t t))))))
+
+(defun LaTeX-arg-beamer-theme (&rest _ignore)
+  "Prompt for beamer theme with completion."
+  (TeX-argument-insert
+   (completing-read
+    (TeX-argument-prompt nil nil "Theme")
+    (mapcar #'list
+            (cond ((eq LaTeX-beamer-themes 'local)
+                   (set (make-local-variable 'LaTeX-beamer-themes)
+                        (LaTeX-beamer-search-themes)))
+                  ((functionp LaTeX-beamer-themes)
+                   (funcall LaTeX-beamer-themes))
+                  ((listp LaTeX-beamer-themes)
+                   LaTeX-beamer-themes)
+                  (t (error
+                      "`LaTeX-beamer-themes' should be a list: `%s'"
+                      LaTeX-beamer-themes))))
+    nil nil nil)
+   t))
+
+(defun LaTeX-arg-beamer-inner-theme (&rest _ignore)
+  "Prompt for beamer inner theme with completion."
+  (TeX-argument-insert
+   (completing-read
+    (TeX-argument-prompt nil nil "Theme")
+    (mapcar #'list
+            (cond ((eq LaTeX-beamer-inner-themes 'local)
+                   (set (make-local-variable 'LaTeX-beamer-inner-themes)
+                        (LaTeX-beamer-search-themes "^beamerinnertheme")))
+                  ((functionp LaTeX-beamer-inner-themes)
+                   (funcall LaTeX-beamer-inner-themes))
+                  ((listp LaTeX-beamer-inner-themes)
+                   LaTeX-beamer-inner-themes)
+                  (t (error
+                      "`LaTeX-beamer-inner-themes' should be a list: `%s'"
+                      LaTeX-beamer-inner-themes))))
+    nil nil nil)
+   t))
+
+(defun LaTeX-arg-beamer-outer-theme (&rest _ignore)
+  "Prompt for beamer outer theme with completion."
+  (TeX-argument-insert
+   (completing-read
+    (TeX-argument-prompt nil nil "Theme")
+    (mapcar #'list
+            (cond ((eq LaTeX-beamer-outer-themes 'local)
+                   (set (make-local-variable 'LaTeX-beamer-outer-themes)
+                        (LaTeX-beamer-search-themes "^beameroutertheme")))
+                  ((functionp LaTeX-beamer-outer-themes)
+                   (funcall LaTeX-beamer-outer-themes))
+                  ((listp LaTeX-beamer-outer-themes)
+                   LaTeX-beamer-outer-themes)
+                  (t (error
+                      "`LaTeX-beamer-outer-themes' should be a list: `%s'"
+                      LaTeX-beamer-outer-themes))))
+    nil nil nil)
+   t))
+
+(defun LaTeX-arg-beamer-color-theme (&rest _ignore)
+  "Prompt for beamer color theme with completion."
+  (TeX-argument-insert
+   (completing-read
+    (TeX-argument-prompt nil nil "Theme")
+    (mapcar #'list
+            (cond ((eq LaTeX-beamer-color-themes 'local)
+                   (set (make-local-variable 'LaTeX-beamer-color-themes)
+                        (LaTeX-beamer-search-themes "^beamercolortheme")))
+                  ((functionp LaTeX-beamer-color-themes)
+                   (funcall LaTeX-beamer-color-themes))
+                  ((listp LaTeX-beamer-color-themes)
+                   LaTeX-beamer-color-themes)
+                  (t (error
+                      "`LaTeX-beamer-color-themes' should be a list: `%s'"
+                      LaTeX-beamer-color-themes))))
+    nil nil nil)
+   t))
+
+(defun LaTeX-arg-beamer-font-theme (&rest _ignore)
+  "Prompt for beamer font theme with completion."
+  (TeX-argument-insert
+   (completing-read
+    (TeX-argument-prompt nil nil "Theme")
+    (mapcar #'list
+            (cond ((eq LaTeX-beamer-font-themes 'local)
+                   (set (make-local-variable 'LaTeX-beamer-font-themes)
+                        (LaTeX-beamer-search-themes "^beamerfonttheme")))
+                  ((functionp LaTeX-beamer-font-themes)
+                   (funcall LaTeX-beamer-font-themes))
+                  ((listp LaTeX-beamer-font-themes)
+                   LaTeX-beamer-font-themes)
+                  (t (error
+                      "`LaTeX-beamer-font-themes' should be a list: `%s'"
+                      LaTeX-beamer-font-themes))))
+    nil nil nil)
+   t))
+
+(defun LaTeX-beamer-class-options ()
+  "Read the beamer class options from the user."
+  (TeX-load-style "hyperref")
+  (TeX-read-key-val t '(("usepdftitle" ("false")) ("envcountsect")
+                        ("notheorems") ("noamsthm") ("compress") ("t") ("c")
+                        ("leqno") ("fleqn") ("handout") ("trans") ("pdftex")
+                        ("nativepdf") ("pdfmark") ("dvips") ("dviwindo")
+                        ("dvipsone") ("vtex") ("ps2pdf") ("ignorenonframetext")
+                        ("noamssymb") ("bigger") ("smaller") ("8pt") ("9pt")
+                        ("10pt") ("11pt") ("12pt") ("14pt") ("17pt") ("20pt")
+                        ("draft") ("CJK") ("cjk") ("pgf")
+                        ("hyperref" LaTeX-hyperref-package-options-list)
+                        ("color") ("xcolor") ("ucs") ("utf8x") ("utf8")
+                        ("aspectratio" ("1610" "169" "149" "54" "43" "32")))))
+
+;;; beamer.el ends here