[patch] Prompt problems in tcl-mode

[Jesper Harder]

Hi,

The following patch adresses two problems in Tcl mode:

* The Tcl prompt, "%", isn't deleted correctly, which results in
  multiple prompts on the same line when sending functions or the
  region to the inferior Tcl buffer. There are two reasons for this:

  1. Due to field boundaries `beginning-of-line' doesn't move over the
     prompt.

  2. A trailing newline is always added even if it's already present.

* On ms-windows /no/ prompt is displayed. The reason is explained on
  <http://wiki.tcl.tk/3005>:

       [..] on Windows, Emacs is unable to make the Tcl interpreter
       start in the "interactive" mode. The problem is that Tcl calls
       istty() to determine whether tcl_interactive should be set and
       whether prompts should be displayed. But the Windows version of
       Emacs can not make istty() return the right value so this
       doesn't happen and tclsh thinks it's running non-interactive.

  My change makes it work out-of-the-box if you're using tclsh.  It
  doesn't fix it if you're using wish, though (which is the default in
  Emacs).


2006-04-18  Jesper Harder  <address@hidden>

        * tcl.el (tcl-eval-region): Replace multiple trailing newlines
        with just one.
        (tcl-send-string): Use (forward-line 0) rather than
        beginning-of-line.
        (tcl-send-region): Delete.
        (inferior-tcl): Set tcl_interactive to 1 on ms-windows.

diff -c /Users/harder/emacs/lisp/progmodes/tcl.el /Users/harder/tcl.el
*** /Users/harder/emacs/lisp/progmodes/tcl.el   Tue Jan 17 00:09:02 2006
--- /Users/harder/tcl.el        Tue Apr 18 22:23:25 2006
***************
*** 1042,1060 ****
  (defun tcl-send-string (proc string)
    (with-current-buffer (process-buffer proc)
      (goto-char (process-mark proc))
!     (beginning-of-line)
      (if (looking-at comint-prompt-regexp)
        (set-marker inferior-tcl-delete-prompt-marker (point))))
    (comint-send-string proc string))
  
- (defun tcl-send-region (proc start end)
-   (with-current-buffer (process-buffer proc)
-     (goto-char (process-mark proc))
-     (beginning-of-line)
-     (if (looking-at comint-prompt-regexp)
-       (set-marker inferior-tcl-delete-prompt-marker (point))))
-   (comint-send-region proc start end))
- 
  (defun switch-to-tcl (eob-p)
    "Switch to inferior Tcl process buffer.
  With argument, positions cursor at end of buffer."
--- 1042,1052 ----
  (defun tcl-send-string (proc string)
    (with-current-buffer (process-buffer proc)
      (goto-char (process-mark proc))
!     (forward-line 0)
      (if (looking-at comint-prompt-regexp)
        (set-marker inferior-tcl-delete-prompt-marker (point))))
    (comint-send-string proc string))
  
  (defun switch-to-tcl (eob-p)
    "Switch to inferior Tcl process buffer.
  With argument, positions cursor at end of buffer."
***************
*** 1079,1088 ****
    "Send the current region to the inferior Tcl process.
  Prefix argument means switch to the Tcl buffer afterwards."
    (interactive "r\nP")
!   (let ((proc (inferior-tcl-proc)))
!     (tcl-send-region proc start end)
!     (tcl-send-string proc "\n")
!     (if and-go (switch-to-tcl t))))
  
  (defun tcl-eval-defun (&optional and-go)
    "Send the current defun to the inferior Tcl process.
--- 1071,1080 ----
    "Send the current region to the inferior Tcl process.
  Prefix argument means switch to the Tcl buffer afterwards."
    (interactive "r\nP")
!   (tcl-send-string
!    (inferior-tcl-proc)
!    (replace-regexp-in-string "\n*$" "\n" (buffer-substring start end)))
!   (when and-go (switch-to-tcl t)))
  
  (defun tcl-eval-defun (&optional and-go)
    "Send the current defun to the inferior Tcl process.
***************
*** 1149,1155 ****
    (unless (comint-check-proc "*inferior-tcl*")
      (set-buffer (apply (function make-comint) "inferior-tcl" cmd nil
                       tcl-command-switches))
!     (inferior-tcl-mode))
    (set (make-local-variable 'tcl-application) cmd)
    (setq inferior-tcl-buffer "*inferior-tcl*")
    (pop-to-buffer "*inferior-tcl*"))
--- 1141,1150 ----
    (unless (comint-check-proc "*inferior-tcl*")
      (set-buffer (apply (function make-comint) "inferior-tcl" cmd nil
                       tcl-command-switches))
!     (inferior-tcl-mode)
!     ;; Make tclsh display a prompt on ms-windows. Doesn't affect wish, 
unfortunately.
!     (when (eq system-type 'windows-nt)
!       (tcl-send-string (inferior-tcl-proc) "set ::tcl_interactive 1; 
concat\n")))
    (set (make-local-variable 'tcl-application) cmd)
    (setq inferior-tcl-buffer "*inferior-tcl*")
    (pop-to-buffer "*inferior-tcl*"))
***************
*** 1551,1553 ****
--- 1546,1549 ----
  
  ;; arch-tag: 8a032554-c3ef-422e-b84c-acec0522179d
  ;;; tcl.el ends here
+ 

Diff finished.  Tue Apr 18 22:23:37 2006