From 7985baf7b2279005d030f313e0673e82a08de930 Mon Sep 17 00:00:00 2001
From: JSDurand <mmemmew@gmail.com>
Date: Mon, 8 Mar 2021 10:39:49 +0800
Subject: More settings with LaTeX

* tex-conf.el (TeX-after-compilation-finished-functions): Revert the
PDF after compilation.

(pdf-sync-forward-display-action):
(pdf-sync-backward-display-action): Display the PDF in the same
window.

(TeX-source-correlate-start-server): Start syncronization between the
TeX buffer and the PDF buffer.

(font-latex-fontify-sectioning): Make sections bigger.

(LaTeX-mode-hook): Add my own preparation function.

(open-paren): Insert a pair of parentheses and put the cursor in
between.

(open-curly): Insert a pair of curly braces and put the cursor in
between.

(open-bracket): Insert a pair of square brackets and put the cursor in
between.

(durand-delete-pair): When the character before point is an open
bracket, delete the corresponding closing bracket as well.

(end-exit-paren): When the character after point is a closing bracket,
exit out of it instead of inserting a closing bracket.

(open-back-paren): If the character before point is a closing bracket,
go back one character into the brackets.

(parens-require-spaces): Don't require spaces around parentheses.

(durand-prepare-latex): Treat the escape character as a symbol, turn
on auto-fill, and don't require spaces around parentheses.

(durand-latex-delete-newline): Delete a newline before point, if any.

(LaTeX-section-hook): Delete the newline between the section and the
label, so that chktex doesn't complain about that space.
---
 tex-conf.el | 130 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 129 insertions(+), 1 deletion(-)

diff --git a/tex-conf.el b/tex-conf.el
index 4c5211d..be0ad34 100644
--- a/tex-conf.el
+++ b/tex-conf.el
@@ -35,7 +35,7 @@
         (output-pdf "PDF Tools")
         (output-html "open")))
 
-;; I don't want to split the screen.
+;;; I don't want to split the screen.
 
 ;;;###autoload
 (defun durand-TeX-pdf-tools-sync-view-a ()
@@ -56,9 +56,27 @@
       (switch-to-buffer (or (find-buffer-visiting pdf)
                             (find-file-noselect pdf))))))
 
+(add-hook 'TeX-after-compilation-finished-functions
+          #'TeX-revert-document-buffer)
+
+(setq pdf-sync-forward-display-action
+      (list (list 'display-buffer-same-window)))
+
+(setq pdf-sync-backward-display-action
+      (list (list 'display-buffer-same-window)))
+
 (advice-add #'TeX-pdf-tools-sync-view :override
             #'durand-TeX-pdf-tools-sync-view-a)
 
+;;; Correlate
+
+(setq TeX-source-correlate-start-server t)
+(TeX-source-correlate-mode 1)
+
+;;; Section display
+
+(setq font-latex-fontify-sectioning 1.3)
+
 ;;; Dollars
 
 (setq TeX-electric-math (cons "\\(" "\\)"))
@@ -71,6 +89,116 @@
   (interactive)
   (insert "\\"))
 
+;;; Parens don't require space
+
+(add-hook 'LaTeX-mode-hook #'durand-prepare-latex)
+
+;;; Brackets handling
+
+(mapc
+ (function
+  (lambda (cell)
+    (define-key LaTeX-mode-map (vector (car cell)) (cdr cell))))
+ (list
+  (cons ?\( #'open-paren)
+  (cons ?{ #'open-curly)
+  (cons ?\[ #'open-bracket)
+  (cons 'backspace #'durand-delete-pair)
+  (cons ?\) #'end-exit-paren)
+  (cons ?à #'open-back-paren)))
+
+;;;###autoload
+(defun open-paren ()
+  "open parenthesis inserts a matching pair"
+  (interactive)
+  (progn
+    (insert "()")
+    (backward-char)))
+
+;;;###autoload
+(defun open-curly ()
+  "open curly inserts a matching pair"
+  (interactive)
+  (progn
+    (insert "{}")
+    (backward-char)))
+
+;;;###autoload
+(defun open-bracket ()
+  "open bracket inserts a matching pair"
+  (interactive)
+  (progn
+    (insert "[]")
+    (backward-char)))
+
+;;;###autoload
+(defun durand-delete-pair ()
+  "Delete the matching pair"
+  (interactive)
+  (cond ((region-active-p) ; if the region is active, then do the original thing
+         (delete-backward-char 1))
+        ((looking-back "\\(\\\\(\\|\\\\\\[\\)" (- (point) 2))
+         (save-excursion
+           (backward-char 1)
+           (ignore-errors
+             (forward-sexp 1)
+             (delete-char -2)))
+         (delete-char -2))
+        ((memq (char-before) '(?\( ?\[ ?\{))
+         (save-excursion
+           (backward-char 1)
+           (ignore-errors
+             (forward-sexp 1)
+             (delete-char -1)))
+         (delete-char -1))
+        (t
+         (backward-delete-char-untabify 1))))
+
+;;;###autoload
+(defun end-exit-paren ()
+  "Use closing pasenthesis to exit the parenthesis"
+  (interactive)
+  (let ((ch (char-after nil))
+        (ch-list '(?\) ?\} ?\] ?\$)))
+    (cond ((memq ch ch-list) (forward-char))
+          ((looking-at-p "\\(\\\\)\\|\\\\]\\|\\\\}\\)")
+           (forward-char 2))
+          (t (self-insert-command 1)))))
+
+;;;###autoload
+(defun open-back-paren ()
+  "Use \"à\" to go back to the parenthesis."
+  (interactive)
+  (let ((ch (char-before nil))
+        (ch-list '(?\) ?\} ?\] ?\$)))
+    (cond ((looking-back "\\(\\\\)\\|\\\\]\\|\\\\}\\)" (- (point) 2))
+           (forward-char -2))
+          ((memq ch ch-list) (backward-char))
+          (t (self-insert-command 1)))))
+
+(make-variable-buffer-local 'parens-require-spaces)
+
+;;;###autoload
+(defun durand-prepare-latex ()
+  "Prepare some settings in LateX mode."
+  (modify-syntax-entry ?\\ "_")
+  (turn-on-auto-fill)
+  (setq parens-require-spaces nil))
+
+;;; Don't insert a new line between the section and the label.
+
+;;;###autoload
+(defun durand-latex-delete-newline ()
+  "If the character before point is a newline, then delete it."
+  (cond
+   ((= (char-before) ?\n)
+    (delete-char -1))))
+
+(setq LaTeX-section-hook
+      '(LaTeX-section-heading LaTeX-section-title
+        LaTeX-section-section durand-latex-delete-newline
+        LaTeX-section-label))
+
 ;;; Expansions
 
 (add-hook 'LaTeX-mode-hook 'LaTeX-math-mode)
-- 
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