* lisp/progmodes/sh-script.el (sh-font-lock-quoted-subshell): Try to better

handle multiline elements.

Fixes: debbugs:18380

1 files changed, 7 insertions, 4 deletions

diff --git a/lisp/progmodes/sh-script.el b/lisp/progmodes/sh-script.el
index 3b0550dccca..5631358b472 100644
--- a/lisp/progmodes/sh-script.el
+++ b/lisp/progmodes/sh-script.el
@@ -1051,13 +1051,11 @@ Point is at the beginning of the next line."
   "Search for a subshell embedded in a string.
 Find all the unescaped \" characters within said subshell, remembering that
 subshells can nest."
-  ;; FIXME: This can (and often does) match multiple lines, yet it makes no
-  ;; effort to handle multiline cases correctly, so it ends up being
-  ;; rather flaky.
   (when (eq ?\" (nth 3 (syntax-ppss))) ; Check we matched an opening quote.
     ;; bingo we have a $( or a ` inside a ""
     (let (;; `state' can be: double-quote, backquote, code.
           (state (if (eq (char-before) ?`) 'backquote 'code))
+          (startpos (point))
           ;; Stacked states in the context.
           (states '(double-quote)))
       (while (and state (progn (skip-chars-forward "^'\\\\\"`$()" limit)
@@ -1088,7 +1086,12 @@ subshells can nest."
                  (`double-quote nil)
                  (_ (setq state (pop states)))))
           (_ (error "Internal error in sh-font-lock-quoted-subshell")))
-        (forward-char 1)))))
+        (forward-char 1))
+      (when (< startpos (line-beginning-position))
+        (put-text-property startpos (point) 'syntax-multiline t)
+        (add-hook 'syntax-propertize-extend-region-functions
+                  'syntax-propertize-multiline nil t))
+      )))
 
 
 (defun sh-is-quoted-p (pos)