bug#16814: `sql-interactive-mode' overwrites `comint' variables

[Emilio C. Lopes <eclig@gmx.net>]

`sql-interactive-mode' sets the variables `comint-input-ring-separator'
and `comint-input-ring-file-name' without making them buffer-local.

When I use `sql-interactive-mode' and afterwards run
`(comint-read-input-ring)' in `shell-mode' I get an empty
`comint-input-ring'.

Here is a patch:

2012-10-09  Emilio C. Lopes  <eclig@gmx.net>

    * progmodes/sql.el (sql-interactive-mode): make variables `comint-input-ring-separator' and
          `comint-input-ring-file-name' buffer-local before setting.


diff --unified lisp/progmodes/sql.el.\~1\~ lisp/progmodes/sql.el
--- lisp/progmodes/sql.el.~1~    2014-02-19 14:31:34.000000000 +0100
+++ lisp/progmodes/sql.el    2014-02-19 14:45:36.000000000 +0100
@@ -3928,8 +3928,8 @@
   ;; People wanting a different history file for each
   ;; buffer/process/client/whatever can change separator and file-name
   ;; on the sql-interactive-mode-hook.
-  (setq comint-input-ring-separator sql-input-ring-separator
-    comint-input-ring-file-name sql-input-ring-file-name)
+  (setq-local comint-input-ring-separator sql-input-ring-separator)
+  (setq-local comint-input-ring-file-name sql-input-ring-file-name)
   ;; Calling the hook before calling comint-read-input-ring allows users
   ;; to set comint-input-ring-file-name in sql-interactive-mode-hook.
   (comint-read-input-ring t))

Diff finished.  Wed Feb 19 14:45:41 2014