GNU bug report logs - #69420
29.2; iSQL point/process-mark fix

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Gary Hollis <ghollisjr <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.2; iSQL point/process-mark fix
Date: Mon, 26 Feb 2024 23:56:05 -0500

When the point is not at the very end of the iSQL buffer, the
process-mark is not kept in a reasonable state if sql-send-string is
called.

Example to reproduce bug:
1. Open a sql-mode buffer.
2. Connect to a SQL database of choice.
3. Move the point of the iSQL buffer to the top, e.g. with M-<
4. Send good queries via sql-send-string, sql-send-region etc.
5. In iSQL buffer, move point to end, e.g. with M->
6. Enter a good query.

Expected result: The new query successfully sends and sql process 
returns output.
Actual result: Whatever contents had been output from the 
sql-send-string, sql-send-region etc. will be sent along with the new query.

To fix: a call to (end-of-buffer) can be placed within the
(save-excursion ...) context before sending any input in the
sql-send-string function, e.g.

;; from sql.el with fix for bug added with BUG FIX comment:
(defun sql-send-string (str)
  "Send the string STR to the SQL process."
  (interactive "sSQL Text: ")

  (let ((comint-input-sender-no-newline nil)
        (s (replace-regexp-in-string "[[:space:]\n\r]+\\'" "" str)))
    (if (sql-buffer-live-p sql-buffer)
    (progn
      ;; Ignore the hoping around...
      (save-excursion
        ;; Set product context
        (with-current-buffer sql-buffer
              (end-of-buffer) ; BUG FIX: correct point before sending input
              (when sql-debug-send
                (message ">>SQL> %S" s))
              (insert "\n")
              (comint-set-process-mark)

          ;; Send the string (trim the trailing whitespace)
          (sql-input-sender (get-buffer-process (current-buffer)) s)

          ;; Send a command terminator if we must
          (sql-send-magic-terminator sql-buffer s sql-send-terminator)

              (when sql-pop-to-buffer-after-send-region
            (message "Sent string to buffer %s" sql-buffer))))

      ;; Display the sql buffer
      (sql-display-buffer sql-buffer))

      ;; We don't have no stinkin' sql
      (user-error "No SQL process started"))))


In GNU Emacs 29.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.40,
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