Electric quote mode: Conditionally replace " (Bug#24710)

* lisp/electric.el (electric-quote-replace-double): New user option.
(electric-quote-post-self-insert-function): Use it.

* test/lisp/electric-tests.el (electric-quote-replace-double-disabled)
(electric-quote-replace-double-bob)
(electric-quote-replace-double-bol)
(electric-quote-replace-double-after-space)
(electric-quote-replace-double-after-letter)
(electric-quote-replace-double-after-paren): New unit tests.

* doc/emacs/text.texi (Quotation Marks): Document
'electric-quote-replace-double'.

1 files changed, 7 insertions, 0 deletions

diff --git a/doc/emacs/text.texi b/doc/emacs/text.texi
index 496b43ce1e3..5aa0c77d34c 100644
--- a/doc/emacs/text.texi
+++ b/doc/emacs/text.texi
@@ -443,6 +443,13 @@ non-@code{nil}, and in programming-language strings if
 @code{nil} for @code{electric-quote-string} and @code{t} for the other
 variables.
 
+@vindex electric-quote-replace-double
+  You can also set the option @code{electric-quote-replace-double} to
+a non-@code{nil} value.  Then, typing @t{"} insert an appropriate
+curved double quote depending on context: @t{“} at the beginning of
+the buffer or after a line break, whitespace, opening parenthesis, or
+quote character, and @t{”} otherwise.
+
   Electric Quote mode is disabled by default.  To toggle it, type
 @kbd{M-x electric-quote-mode}.  To toggle it in a single buffer, use
 @kbd{M-x electric-quote-local-mode}.  To suppress it for a single use,