Ignore double backslashes (newlines) in Latex (#784)

smartparens-latex.el

@@ -83,13 +83,31 @@
  (delete-char 2)
  (forward-char 2))))
 
+(defun sp-number-of-backslashes-before-point ()
+ (let ((p (point)))
+ (while (and (> p 0) (equal (char-before p) ?\\ ))
+ (setq p (- p 1)))
+ (- (point) p)))
+
+(defun sp--latex-backslash-skip-match (ms mb _me)
+ "Skips a match if preceeded by uneven number of backslashes."
+ (and ms
+ (save-excursion
+ (goto-char mb)
+ (not (evenp (sp-number-of-backslashes-before-point))))))
+
 (defun sp-latex-point-after-backslash (id action context)
- "Return t if point follows a backslash, nil otherwise.
-This predicate is only tested on \"insert\" action.
+ "Return t if point follows an uneven number of backslashes (a
+double backslash is a newline; we'd like to ignore those), nil
+otherwise. This predicate is only tested on \"insert\" action.
 ID, ACTION, CONTEXT."
  (when (eq action 'insert)
- (let ((trigger (sp-get-pair id :trigger)))
- (looking-back (concat "\\\\" (regexp-quote (if trigger trigger id)))))))
+ (let* ((trigger (sp-get-pair id :trigger))
+ (start (- (point) (length (if trigger trigger id)))))
+ (when (> start 1)
+ (save-excursion
+ (goto-char start)
+ (not (evenp (sp-number-of-backslashes-before-point))))))))
 
 (defun sp-latex-point-before-word-p (id action context)
  "Return t if point is before a word while in navigate action.
@@ -98,7 +116,7 @@ ID, ACTION, CONTEXT."
  (looking-at-p "\\sw")))
 
 (add-to-list 'sp-navigate-skip-match
- '((tex-mode plain-tex-mode latex-mode) . sp--backslash-skip-match))
+ '((tex-mode plain-tex-mode latex-mode) . sp--latex-backslash-skip-match))
 
 (sp-with-modes '(
  tex-mode
@@ -111,9 +129,11 @@ ID, ACTION, CONTEXT."
  :skip-match 'sp-latex-skip-match-apostrophe
  :unless '(sp-latex-point-after-backslash
  sp-latex-point-before-word-p))
+
  ;; math modes, yay. The :actions are provided automatically if
  ;; these pairs do not have global definitions.
- (sp-local-pair "$" "$")
+ (sp-local-pair "$" "$"
+ :unless '(sp-latex-point-after-backslash))
  (sp-local-pair "\\[" "\\]"
  :unless '(sp-latex-point-after-backslash))
 
@@ -131,64 +151,104 @@ ID, ACTION, CONTEXT."
  :post-handlers '(sp-latex-skip-double-quote))
 
  ;; add the prefix function sticking to {} pair
- (sp-local-pair "{" nil :prefix "\\\\\\(\\sw\\|\\s_\\)*")
-
+ (sp-local-pair "{" "}"
+ :prefix "\\\\\\(\\sw\\|\\s_\\)*"
+ :unless '(sp-latex-point-after-backslash))
+
  ;; do not add more space when slurping
- (sp-local-pair "{" "}")
- (sp-local-pair "(" ")")
- (sp-local-pair "[" "]")
+ (sp-local-pair "\\{" "\\}"
+ :unless '(sp-latex-point-after-backslash))
+ (sp-local-pair "[" "]"
+ :unless '(sp-latex-point-after-backslash))
+ (sp-local-pair "(" ")"
+ :unless '(sp-latex-point-after-backslash))
+ (sp-local-pair "\\(" "\\)"
+ :unless '(sp-latex-point-after-backslash))
 
  ;; pairs for big brackets. Needs more research on what pairs are
  ;; useful to add here. Post suggestions if you know some.
  (sp-local-pair "\\left(" "\\right)"
  :trigger "\\l("
  :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\left[" "\\right]"
  :trigger "\\l["
  :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\left\\{" "\\right\\}"
  :trigger "\\l{"
  :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\left|" "\\right|"
  :trigger "\\l|"
  :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\bigl(" "\\bigr)"
+ :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\biggl(" "\\biggr)"
+ :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\Bigl(" "\\Bigr)"
+ :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\Biggl(" "\\Biggr)"
+ :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\bigl[" "\\bigr]"
+ :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\biggl[" "\\biggr]"
+ :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\Bigl[" "\\Bigr]"
+ :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\Biggl[" "\\Biggr]"
+ :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\bigl\\{" "\\bigr\\}"
+ :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\biggl\\{" "\\biggr\\}"
+ :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\Bigl\\{" "\\Bigr\\}"
+ :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\Biggl\\{" "\\Biggr\\}"
+ :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\lfloor" "\\rfloor"
+ :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\lceil" "\\rceil"
+ :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
  (sp-local-pair "\\langle" "\\rangle"
+ :when '(sp-in-math-p)
+ :unless '(sp-latex-point-after-backslash)
  :post-handlers '(sp-latex-insert-spaces-inside-pair))
 
  ;; some common wrappings
- (sp-local-tag "\"" "``" "''" :actions '(wrap))
  (sp-local-tag "\\b" "\\begin{_}" "\\end{_}")
  (sp-local-tag "bi" "\\begin{itemize}" "\\end{itemize}")
  (sp-local-tag "be" "\\begin{enumerate}" "\\end{enumerate}"))