;;; xscheme.el --- run MIT Scheme under Emacs
-;; Copyright (C) 1986, 1987, 1989, 1990 Free Software Foundation, Inc.
+;; Copyright (C) 1986, 1987, 1989, 1990, 2001 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: languages, lisp
;;; Commentary:
-;; A major mode for editing Scheme and interacting with MIT's C-Scheme.
+;; A major mode for interacting with MIT Scheme.
;;
-;; Requires C-Scheme release 5 or later
-;; Changes to Control-G handler require runtime version 13.85 or later
+;; Requires MIT Scheme release 5 or later.
+;; Changes to Control-G handler require runtime version 13.85 or later.
;;; Code:
:type 'boolean
:group 'xscheme)
+(defcustom xscheme-start-hook nil
+ "If non-nil, a procedure to call when the Scheme process is started.
+When called, the current buffer will be the Scheme process-buffer."
+ :type 'hook
+ :group 'xscheme
+ :version 20.3)
+
(defun xscheme-evaluation-commands (keymap)
(define-key keymap "\e\C-x" 'xscheme-send-definition)
(define-key keymap "\C-x\C-e" 'advertised-xscheme-send-previous-expression)
"Run MIT Scheme in an inferior process.
Output goes to the buffer `*scheme*'.
With argument, asks for a command line."
- (interactive
- (list (let ((default
- (or xscheme-process-command-line
- (xscheme-default-command-line))))
- (if current-prefix-arg
- (read-string "Run Scheme: " default)
- default))))
- (setq xscheme-process-command-line command-line)
- (pop-to-buffer (xscheme-start-process command-line)))
+ (interactive (list (xscheme-read-command-line current-prefix-arg)))
+ (xscheme-start command-line xscheme-process-name xscheme-buffer-name))
+
+(defun xscheme-start (command-line process-name buffer-name)
+ (setq-default xscheme-process-command-line command-line)
+ (switch-to-buffer
+ (xscheme-start-process command-line process-name buffer-name))
+ (make-local-variable 'xscheme-process-command-line)
+ (setq xscheme-process-command-line command-line))
+
+(defun xscheme-read-command-line (arg)
+ (let ((default
+ (or xscheme-process-command-line
+ (xscheme-default-command-line))))
+ (if arg
+ (read-string "Run Scheme: " default)
+ default)))
+
+(defun xscheme-default-command-line ()
+ (concat scheme-program-name " -emacs"
+ (if scheme-program-arguments
+ (concat " " scheme-program-arguments)
+ "")
+ (if scheme-band-name
+ (concat " -band " scheme-band-name)
+ "")))
(defun reset-scheme ()
"Reset the Scheme process."
(interactive)
- (let ((process (get-process "scheme")))
+ (let ((process (get-process xscheme-process-name)))
(cond ((or (not process)
(not (eq (process-status process) 'run))
(yes-or-no-p
"The Scheme process is running, are you SURE you want to reset it? "))
(message "Resetting Scheme process...")
- (if process (kill-process process t))
- (xscheme-start-process xscheme-process-command-line)
+ (if process
+ (progn
+ (kill-process process t)
+ (delete-process process)))
+ (xscheme-start-process xscheme-process-command-line
+ xscheme-process-name
+ xscheme-buffer-name)
(message "Resetting Scheme process...done")))))
+\f
+;;;; Multiple Scheme buffer management commands
-(defun xscheme-default-command-line ()
- (concat scheme-program-name " -emacs"
- (if scheme-program-arguments
- (concat " " scheme-program-arguments)
- "")
- (if scheme-band-name
- (concat " -band " scheme-band-name)
- "")))
+(defun start-scheme (buffer-name &optional globally)
+ "Choose a scheme interaction buffer, or create a new one."
+ ;; (interactive "BScheme interaction buffer: \nP")
+ (interactive
+ (list (read-buffer "Scheme interaction buffer: "
+ xscheme-buffer-name
+ nil)
+ current-prefix-arg))
+ (let ((buffer (get-buffer-create buffer-name)))
+ (let ((process (get-buffer-process buffer)))
+ (if process
+ (switch-to-buffer buffer)
+ (if (or (not (buffer-file-name buffer))
+ (yes-or-no-p (concat "Buffer "
+ (buffer-name buffer)
+ " contains file "
+ (buffer-file-name buffer)
+ "; start scheme in it? ")))
+ (progn
+ (xscheme-start (xscheme-read-command-line t)
+ buffer-name
+ buffer-name)
+ (if globally
+ (global-set-scheme-interaction-buffer buffer-name)))
+ (message "start-scheme aborted"))))))
+
+(fset 'select-scheme 'start-scheme)
+
+(defun global-set-scheme-interaction-buffer (buffer-name)
+ "Set the default scheme interaction buffer."
+ (interactive
+ (list (read-buffer "Scheme interaction buffer: "
+ xscheme-buffer-name
+ t)))
+ (let ((process-name (verify-xscheme-buffer buffer-name nil)))
+ (setq-default xscheme-buffer-name buffer-name)
+ (setq-default xscheme-process-name process-name)
+ (setq-default xscheme-runlight-string
+ (save-excursion (set-buffer buffer-name)
+ xscheme-runlight-string))
+ (setq-default xscheme-runlight
+ (if (eq (process-status process-name) 'run)
+ default-xscheme-runlight
+ ""))))
+
+(defun local-set-scheme-interaction-buffer (buffer-name)
+ "Set the scheme interaction buffer for the current buffer."
+ (interactive
+ (list (read-buffer "Scheme interaction buffer: "
+ xscheme-buffer-name
+ t)))
+ (let ((process-name (verify-xscheme-buffer buffer-name t)))
+ (make-local-variable 'xscheme-buffer-name)
+ (setq xscheme-buffer-name buffer-name)
+ (make-local-variable 'xscheme-process-name)
+ (setq xscheme-process-name process-name)
+ (make-local-variable 'xscheme-runlight)
+ (setq xscheme-runlight (save-excursion (set-buffer buffer-name)
+ xscheme-runlight))))
+
+(defun local-clear-scheme-interaction-buffer ()
+ "Make the current buffer use the default scheme interaction buffer."
+ (interactive)
+ (if (xscheme-process-buffer-current-p)
+ (error "Cannot change the interaction buffer of an interaction buffer"))
+ (kill-local-variable 'xscheme-buffer-name)
+ (kill-local-variable 'xscheme-process-name)
+ (kill-local-variable 'xscheme-runlight))
+
+(defun verify-xscheme-buffer (buffer-name localp)
+ (if (and localp (xscheme-process-buffer-current-p))
+ (error "Cannot change the interaction buffer of an interaction buffer"))
+ (let* ((buffer (get-buffer buffer-name))
+ (process (and buffer (get-buffer-process buffer))))
+ (cond ((not buffer)
+ (error "Buffer does not exist" buffer-name))
+ ((not process)
+ (error "Buffer is not a scheme interaction buffer" buffer-name))
+ (t
+ (save-excursion
+ (set-buffer buffer)
+ (if (not (xscheme-process-buffer-current-p))
+ (error "Buffer is not a scheme interaction buffer"
+ buffer-name)))
+ (process-name process)))))
\f
;;;; Interaction Mode
-(defun scheme-interaction-mode ()
- "Major mode for interacting with the inferior Scheme process.
+(defun scheme-interaction-mode (&optional preserve)
+ "Major mode for interacting with an inferior MIT Scheme process.
Like scheme-mode except that:
\\[advertised-xscheme-send-previous-expression] sends the expression before point to the Scheme process as input
-\\[xscheme-yank-previous-send] yanks the expression most recently sent to Scheme
+\\[xscheme-yank-pop] yanks an expression previously sent to Scheme
+\\[xscheme-yank-push] yanks an expression more recently sent to Scheme
All output from the Scheme process is written in the Scheme process
buffer, which is initially named \"*scheme*\". The result of
with no args, if that value is non-nil.
Likewise with the value of scheme-mode-hook.
scheme-interaction-mode-hook is called after scheme-mode-hook."
- (interactive)
- (kill-all-local-variables)
+ (interactive "P")
+ (if (not preserve)
+ (let ((previous-mode major-mode))
+ (kill-all-local-variables)
+ (make-local-variable 'xscheme-previous-mode)
+ (make-local-variable 'xscheme-buffer-name)
+ (make-local-variable 'xscheme-process-name)
+ (make-local-variable 'xscheme-previous-process-state)
+ (make-local-variable 'xscheme-runlight-string)
+ (make-local-variable 'xscheme-runlight)
+ (make-local-variable 'xscheme-last-input-end)
+ (setq xscheme-previous-mode previous-mode)
+ (let ((buffer (current-buffer)))
+ (setq xscheme-buffer-name (buffer-name buffer))
+ (setq xscheme-last-input-end (make-marker))
+ (let ((process (get-buffer-process buffer)))
+ (if process
+ (progn
+ (setq xscheme-process-name (process-name process))
+ (setq xscheme-previous-process-state
+ (cons (process-filter process)
+ (process-sentinel process)))
+ (xscheme-process-filter-initialize t)
+ (xscheme-modeline-initialize xscheme-buffer-name)
+ (set-process-sentinel process 'xscheme-process-sentinel)
+ (set-process-filter process 'xscheme-process-filter))
+ (setq xscheme-previous-process-state (cons nil nil)))))))
(scheme-interaction-mode-initialize)
(scheme-mode-variables)
- (make-local-variable 'xscheme-previous-send)
(run-hooks 'scheme-mode-hook 'scheme-interaction-mode-hook))
+(defun exit-scheme-interaction-mode ()
+ "Take buffer out of scheme interaction mode"
+ (interactive)
+ (if (not (eq major-mode 'scheme-interaction-mode))
+ (error "Buffer not in scheme interaction mode"))
+ (let ((previous-state xscheme-previous-process-state))
+ (funcall xscheme-previous-mode)
+ (let ((process (get-buffer-process (current-buffer))))
+ (if process
+ (progn
+ (if (eq (process-filter process) 'xscheme-process-filter)
+ (set-process-filter process (car previous-state)))
+ (if (eq (process-sentinel process) 'xscheme-process-sentinel)
+ (set-process-sentinel process (cdr previous-state))))))))
+
(defun scheme-interaction-mode-initialize ()
(use-local-map scheme-interaction-mode-map)
(setq major-mode 'scheme-interaction-mode)
(setq mode-name "Scheme Interaction"))
(defun scheme-interaction-mode-commands (keymap)
- (define-key keymap "\C-c\C-m" 'xscheme-send-current-line)
- (define-key keymap "\C-c\C-p" 'xscheme-send-proceed)
- (define-key keymap "\C-c\C-y" 'xscheme-yank-previous-send))
+ (let ((entries scheme-interaction-mode-commands-alist))
+ (while entries
+ (define-key keymap
+ (car (car entries))
+ (car (cdr (car entries))))
+ (setq entries (cdr entries)))))
+
+(defvar scheme-interaction-mode-commands-alist nil)
+(setq scheme-interaction-mode-commands-alist
+ (append scheme-interaction-mode-commands-alist
+ '(("\C-c\C-m" xscheme-send-current-line)
+ ("\C-c\C-o" xscheme-delete-output)
+ ("\C-c\C-p" xscheme-send-proceed)
+ ("\C-c\C-y" xscheme-yank)
+ ("\ep" xscheme-yank-pop)
+ ("\en" xscheme-yank-push))))
(defvar scheme-interaction-mode-map nil)
(if (not scheme-interaction-mode-map)
(if (not (eq major-mode 'scheme-interaction-mode))
(if (eq major-mode 'scheme-debugger-mode)
(scheme-interaction-mode-initialize)
- (scheme-interaction-mode)))))
+ (scheme-interaction-mode t)))))
(fset 'advertised-xscheme-send-previous-expression
'xscheme-send-previous-expression)
(if (not (eq major-mode 'scheme-debugger-mode))
(progn
(if (not (eq major-mode 'scheme-interaction-mode))
- (scheme-interaction-mode))
+ (scheme-interaction-mode t))
(scheme-debugger-mode-initialize)))))
(defun xscheme-debugger-mode-p ()
(progn
(reset-scheme)
(xscheme-wait-for-process)
- (goto-char (point-max))
- (apply 'insert-before-markers strings)
(xscheme-send-string-1 strings))))
((xscheme-debugger-mode-p) (error "No sends allowed in debugger mode"))
((and (not xscheme-allow-pipelined-evaluation)
(let ((string (apply 'concat strings)))
(xscheme-send-string-2 string)
(if (eq major-mode 'scheme-interaction-mode)
- (setq xscheme-previous-send string))))
+ (xscheme-insert-expression string))))
(defun xscheme-send-string-2 (string)
- (let ((process (get-process "scheme")))
- (send-string process (concat string "\n"))
+ (let ((process (get-process xscheme-process-name)))
+ (process-send-string process (concat string "\n"))
(if (xscheme-process-buffer-current-p)
(set-marker (process-mark process) (point)))))
-(defun xscheme-yank-previous-send ()
- "Insert the most recent expression at point."
- (interactive)
- (push-mark)
- (insert xscheme-previous-send))
-
(defun xscheme-select-process-buffer ()
"Select the Scheme process buffer and move to its output point."
(interactive)
- (let ((process (or (get-process "scheme") (error "No scheme process"))))
+ (let ((process
+ (or (get-process xscheme-process-name)
+ (error "No scheme process"))))
(let ((buffer (or (process-buffer process) (error "No process buffer"))))
(let ((window (get-buffer-window buffer)))
(if window
(switch-to-buffer buffer))
(goto-char (process-mark process))))))
\f
+;;;; Scheme expressions ring
+
+(defun xscheme-insert-expression (string)
+ (setq xscheme-expressions-ring (cons string xscheme-expressions-ring))
+ (if (> (length xscheme-expressions-ring) xscheme-expressions-ring-max)
+ (setcdr (nthcdr (1- xscheme-expressions-ring-max)
+ xscheme-expressions-ring)
+ nil))
+ (setq xscheme-expressions-ring-yank-pointer xscheme-expressions-ring))
+
+(defun xscheme-rotate-yank-pointer (arg)
+ "Rotate the yanking point in the kill ring."
+ (interactive "p")
+ (let ((length (length xscheme-expressions-ring)))
+ (if (zerop length)
+ (error "Scheme expression ring is empty")
+ (setq xscheme-expressions-ring-yank-pointer
+ (let ((index
+ (% (+ arg
+ (- length
+ (length xscheme-expressions-ring-yank-pointer)))
+ length)))
+ (nthcdr (if (< index 0)
+ (+ index length)
+ index)
+ xscheme-expressions-ring))))))
+
+(defun xscheme-yank (&optional arg)
+ "Insert the most recent expression at point.
+With just C-U as argument, same but put point in front (and mark at end).
+With argument n, reinsert the nth most recently sent expression.
+See also the commands \\[xscheme-yank-pop] and \\[xscheme-yank-push]."
+ (interactive "*P")
+ (xscheme-rotate-yank-pointer (if (listp arg) 0
+ (if (eq arg '-) -1
+ (1- arg))))
+ (push-mark (point))
+ (insert (car xscheme-expressions-ring-yank-pointer))
+ (if (consp arg)
+ (exchange-point-and-mark)))
+
+;; Old name, to avoid errors in users' init files.
+(fset 'xscheme-yank-previous-send
+ 'xscheme-yank)
+
+(defun xscheme-yank-pop (arg)
+ "Insert or replace a just-yanked expression with an older expression.
+If the previous command was not a yank, it yanks.
+Otherwise, the region contains a stretch of reinserted
+expression. yank-pop deletes that text and inserts in its
+place a different expression.
+
+With no argument, the next older expression is inserted.
+With argument n, the n'th older expression is inserted.
+If n is negative, this is a more recent expression.
+
+The sequence of expressions wraps around, so that after the oldest one
+comes the newest one."
+ (interactive "*p")
+ (setq this-command 'xscheme-yank)
+ (if (not (eq last-command 'xscheme-yank))
+ (progn
+ (xscheme-yank)
+ (setq arg (- arg 1))))
+ (if (not (= arg 0))
+ (let ((before (< (point) (mark))))
+ (delete-region (point) (mark))
+ (xscheme-rotate-yank-pointer arg)
+ (set-mark (point))
+ (insert (car xscheme-expressions-ring-yank-pointer))
+ (if before (exchange-point-and-mark)))))
+
+(defun xscheme-yank-push (arg)
+ "Insert or replace a just-yanked expression with a more recent expression.
+If the previous command was not a yank, it yanks.
+Otherwise, the region contains a stretch of reinserted
+expression. yank-pop deletes that text and inserts in its
+place a different expression.
+
+With no argument, the next more recent expression is inserted.
+With argument n, the n'th more recent expression is inserted.
+If n is negative, a less recent expression is used.
+
+The sequence of expressions wraps around, so that after the oldest one
+comes the newest one."
+ (interactive "*p")
+ (xscheme-yank-pop (- 0 arg)))
+\f
(defun xscheme-send-region (start end)
"Send the current region to the Scheme process.
The region is sent terminated by a newline."
(interactive "r")
(if (xscheme-process-buffer-current-p)
- (progn (goto-char end)
- (set-marker (process-mark (get-process "scheme")) end)))
+ (progn
+ (goto-char end)
+ (if (not (bolp))
+ (insert-before-markers ?\n))
+ (set-marker (process-mark (get-process xscheme-process-name))
+ (point))
+ (set-marker xscheme-last-input-end (point))))
(xscheme-send-string (buffer-substring start end)))
(defun xscheme-send-definition ()
(defun xscheme-send-char (char)
"Prompt for a character and send it to the Scheme process."
(interactive "cCharacter to send: ")
- (send-string "scheme" (char-to-string char)))
+ (process-send-string xscheme-process-name (char-to-string char)))
+
+(defun xscheme-delete-output ()
+ "Delete all output from interpreter since last input."
+ (interactive)
+ (let ((proc (get-buffer-process (current-buffer))))
+ (save-excursion
+ (goto-char (process-mark proc))
+ (re-search-backward
+ "^;\\(Unspecified return value$\\|Value\\( [0-9]+\\)?: \\|\\(Abort\\|Up\\|Quit\\)!$\\)"
+ xscheme-last-input-end
+ t)
+ (forward-line 0)
+ (if (< (marker-position xscheme-last-input-end) (point))
+ (progn
+ (delete-region xscheme-last-input-end (point))
+ (insert-before-markers "*** output flushed ***\n"))))))
\f
;;;; Interrupts
(defun xscheme-send-proceed ()
"Cause the Scheme process to proceed from a breakpoint."
(interactive)
- (send-string "scheme" "(proceed)\n"))
+ (process-send-string xscheme-process-name "(proceed)\n"))
(defun xscheme-send-control-g-interrupt ()
"Cause the Scheme processor to halt and flush input.
(interactive)
(let ((inhibit-quit t))
(cond ((not xscheme-control-g-synchronization-p)
- (interrupt-process "scheme"))
- (xscheme-control-g-disabled-p
+ (interrupt-process xscheme-process-name))
+ ((save-excursion
+ (set-buffer xscheme-buffer-name)
+ xscheme-control-g-disabled-p)
(message "Relax..."))
(t
- (setq xscheme-control-g-disabled-p t)
- (message "Sending C-G interrupt to Scheme...")
- (interrupt-process "scheme")
- (send-string "scheme" (char-to-string 0))))))
+ (save-excursion
+ (set-buffer xscheme-buffer-name)
+ (setq xscheme-control-g-disabled-p t))
+ (message xscheme-control-g-message-string)
+ (interrupt-process xscheme-process-name)
+ (sleep-for 0.1)
+ (xscheme-send-char 0)))))
+
+(defconst xscheme-control-g-message-string
+ "Sending C-G interrupt to Scheme...")
(defun xscheme-send-control-u-interrupt ()
"Cause the Scheme process to halt, returning to previous rep loop."
(defun xscheme-send-interrupt (char mark-p)
"Send a ^A type interrupt to the Scheme process."
(interactive "cInterrupt character to send: ")
- (quit-process "scheme")
- (send-string "scheme" (char-to-string char))
+ (quit-process xscheme-process-name)
+ (sleep-for 0.1)
+ (xscheme-send-char char)
(if (and mark-p xscheme-control-g-synchronization-p)
- (send-string "scheme" (char-to-string 0))))
+ (xscheme-send-char 0)))
\f
;;;; Internal Variables
(defvar xscheme-process-command-line nil
"Command used to start the most recent Scheme process.")
-(defvar xscheme-previous-send ""
- "Most recent expression transmitted to the Scheme process.")
+(defvar xscheme-process-name "scheme"
+ "Name of xscheme process that we're currently interacting with.")
+
+(defvar xscheme-buffer-name "*scheme*"
+ "Name of xscheme buffer that we're currently interacting with.")
+
+(defvar xscheme-expressions-ring-max 30
+ "*Maximum length of Scheme expressions ring.")
+
+(defvar xscheme-expressions-ring nil
+ "List of expressions recently transmitted to the Scheme process.")
+
+(defvar xscheme-expressions-ring-yank-pointer nil
+ "The tail of the Scheme expressions ring whose car is the last thing yanked.")
+
+(defvar xscheme-last-input-end)
(defvar xscheme-process-filter-state 'idle
"State of scheme process escape reader state machine:
(defvar xscheme-string-receiver nil
"Procedure to send the string argument from the scheme process.")
-(defcustom xscheme-start-hook nil
- "If non-nil, a procedure to call when the Scheme process is started.
-When called, the current buffer will be the Scheme process-buffer."
- :type 'hook
- :group 'xscheme)
+(defconst default-xscheme-runlight
+ '(": " xscheme-runlight-string)
+ "Default global (shared) xscheme-runlight modeline format.")
+(defvar xscheme-runlight "")
(defvar xscheme-runlight-string nil)
(defvar xscheme-mode-string nil)
-(defvar xscheme-filter-input nil)
+(setq-default scheme-mode-line-process
+ '("" xscheme-runlight))
+
+(mapcar 'make-variable-buffer-local
+ '(xscheme-expressions-ring
+ xscheme-expressions-ring-yank-pointer
+ xscheme-process-filter-state
+ xscheme-running-p
+ xscheme-control-g-disabled-p
+ xscheme-allow-output-p
+ xscheme-prompt
+ xscheme-string-accumulator
+ xscheme-mode-string
+ scheme-mode-line-process))
\f
;;;; Basic Process Control
-(defun xscheme-start-process (command-line)
- (let ((buffer (get-buffer-create "*scheme*")))
+(defun xscheme-start-process (command-line the-process the-buffer)
+ (let ((buffer (get-buffer-create the-buffer)))
(let ((process (get-buffer-process buffer)))
(save-excursion
(set-buffer buffer)
(set-marker (process-mark process) (point-max))
(progn (if process (delete-process process))
(goto-char (point-max))
- (scheme-interaction-mode)
+ (scheme-interaction-mode nil)
+ (setq xscheme-process-name the-process)
(if (bobp)
(insert-before-markers
(substitute-command-keys xscheme-startup-message)))
(setq process
(let ((process-connection-type nil))
(apply 'start-process
- (cons "scheme"
+ (cons the-process
(cons buffer
(xscheme-parse-command-line
command-line))))))
+ (if (not (equal (process-name process) the-process))
+ (setq xscheme-process-name (process-name process)))
+ (if (not (equal (buffer-name buffer) the-buffer))
+ (setq xscheme-buffer-name (buffer-name buffer)))
+ (message "Starting process %s in buffer %s"
+ xscheme-process-name
+ xscheme-buffer-name)
(set-marker (process-mark process) (point-max))
(xscheme-process-filter-initialize t)
- (xscheme-modeline-initialize)
+ (xscheme-modeline-initialize xscheme-buffer-name)
(set-process-sentinel process 'xscheme-process-sentinel)
(set-process-filter process 'xscheme-process-filter)
(run-hooks 'xscheme-start-hook)))))
(defun xscheme-process-running-p ()
"True iff there is a Scheme process whose status is `run'."
- (let ((process (get-process "scheme")))
+ (let ((process (get-process xscheme-process-name)))
(and process
(eq (process-status process) 'run))))
(defun xscheme-process-buffer ()
- (let ((process (get-process "scheme")))
+ (let ((process (get-process xscheme-process-name)))
(and process (process-buffer process))))
(defun xscheme-process-buffer-window ()
;;;; Process Filter
(defun xscheme-process-sentinel (proc reason)
- (xscheme-process-filter-initialize (eq reason 'run))
- (if (eq reason 'run)
- (xscheme-modeline-initialize)
- (progn
- (setq scheme-mode-line-process "")
- (setq xscheme-mode-string "no process")))
- (if (and (not (memq reason '(run stop)))
- xscheme-signal-death-message)
- (progn (beep)
- (message
-"The Scheme process has died! Do M-x reset-scheme to restart it"))))
+ (let* ((buffer (process-buffer proc))
+ (name (buffer-name buffer)))
+ (save-excursion
+ (set-buffer buffer)
+ (xscheme-process-filter-initialize (eq reason 'run))
+ (if (not (eq reason 'run))
+ (progn
+ (setq scheme-mode-line-process "")
+ (setq xscheme-mode-string "no process")
+ (if (equal name (default-value 'xscheme-buffer-name))
+ (setq-default xscheme-runlight ""))))
+ (if (and (not (memq reason '(run stop)))
+ xscheme-signal-death-message)
+ (progn
+ (beep)
+ (message
+"The Scheme process has died! Do M-x reset-scheme to restart it"))))))
(defun xscheme-process-filter-initialize (running-p)
(setq xscheme-process-filter-state 'idle)
(setq xscheme-control-g-disabled-p nil)
(setq xscheme-allow-output-p t)
(setq xscheme-prompt "")
- (setq scheme-mode-line-process '(": " xscheme-runlight-string)))
+ (if running-p
+ (let ((name (buffer-name (current-buffer))))
+ (setq scheme-mode-line-process '(": " xscheme-runlight-string))
+ (xscheme-modeline-initialize name)
+ (if (equal name (default-value 'xscheme-buffer-name))
+ (setq-default xscheme-runlight default-xscheme-runlight))))
+ (if (or (eq xscheme-runlight default-xscheme-runlight)
+ (equal xscheme-runlight ""))
+ (setq xscheme-runlight (list ": " 'xscheme-buffer-name ": " "?")))
+ (rplaca (nthcdr 3 xscheme-runlight)
+ (if running-p "?" "no process")))
(defun xscheme-process-filter (proc string)
- (let ((xscheme-filter-input string))
+ (let ((xscheme-filter-input string)
+ (call-noexcursion nil))
(while xscheme-filter-input
- (cond ((eq xscheme-process-filter-state 'idle)
- (let ((start (string-match "\e" xscheme-filter-input)))
- (if start
- (progn
- (xscheme-process-filter-output
- (substring xscheme-filter-input 0 start))
- (setq xscheme-filter-input
- (substring xscheme-filter-input (1+ start)))
- (setq xscheme-process-filter-state 'reading-type))
+ (setq call-noexcursion nil)
+ (save-excursion
+ (set-buffer (process-buffer proc))
+ (cond ((eq xscheme-process-filter-state 'idle)
+ (let ((start (string-match "\e" xscheme-filter-input)))
+ (if start
+ (progn
+ (xscheme-process-filter-output
+ (substring xscheme-filter-input 0 start))
+ (setq xscheme-filter-input
+ (substring xscheme-filter-input (1+ start)))
+ (setq xscheme-process-filter-state 'reading-type))
(let ((string xscheme-filter-input))
(setq xscheme-filter-input nil)
(xscheme-process-filter-output string)))))
- ((eq xscheme-process-filter-state 'reading-type)
- (if (zerop (length xscheme-filter-input))
- (setq xscheme-filter-input nil)
+ ((eq xscheme-process-filter-state 'reading-type)
+ (if (zerop (length xscheme-filter-input))
+ (setq xscheme-filter-input nil)
(let ((char (aref xscheme-filter-input 0)))
(setq xscheme-filter-input
(substring xscheme-filter-input 1))
(let ((entry (assoc char xscheme-process-filter-alist)))
(if entry
(funcall (nth 2 entry) (nth 1 entry))
- (progn
- (xscheme-process-filter-output ?\e char)
- (setq xscheme-process-filter-state 'idle)))))))
- ((eq xscheme-process-filter-state 'reading-string)
- (let ((start (string-match "\e" xscheme-filter-input)))
- (if start
- (let ((string
- (concat xscheme-string-accumulator
- (substring xscheme-filter-input 0 start))))
- (setq xscheme-filter-input
- (substring xscheme-filter-input (1+ start)))
- (setq xscheme-process-filter-state 'idle)
- (funcall xscheme-string-receiver string))
+ (progn
+ (xscheme-process-filter-output ?\e char)
+ (setq xscheme-process-filter-state 'idle)))))))
+ ((eq xscheme-process-filter-state 'reading-string)
+ (let ((start (string-match "\e" xscheme-filter-input)))
+ (if start
+ (let ((string
+ (concat xscheme-string-accumulator
+ (substring xscheme-filter-input 0 start))))
+ (setq xscheme-filter-input
+ (substring xscheme-filter-input (1+ start)))
+ (setq xscheme-process-filter-state 'idle)
+ (if (listp xscheme-string-receiver)
+ (progn
+ (setq xscheme-string-receiver
+ (car xscheme-string-receiver))
+ (setq call-noexcursion string))
+ (funcall xscheme-string-receiver string)))
(progn
(setq xscheme-string-accumulator
(concat xscheme-string-accumulator
xscheme-filter-input))
(setq xscheme-filter-input nil)))))
- (t
- (error "Scheme process filter -- bad state"))))))
+ (t
+ (error "Scheme process filter -- bad state"))))
+ (if call-noexcursion
+ (funcall xscheme-string-receiver call-noexcursion)))))
\f
;;;; Process Filter Output
(let ((string (apply 'concat args)))
(save-excursion
(xscheme-goto-output-point)
- (while (string-match "\\(\007\\|\f\\)" string)
- (let ((start (match-beginning 0))
- (end (match-end 0)))
- (insert-before-markers (substring string 0 start))
- (if (= ?\f (aref string start))
- (progn
- (if (not (bolp))
- (insert-before-markers ?\n))
- (insert-before-markers ?\f))
- (beep))
- (setq string (substring string (1+ start)))))
- (insert-before-markers string)))))
+ (let ((old-point (point)))
+ (while (string-match "\\(\007\\|\f\\)" string)
+ (let ((start (match-beginning 0))
+ (end (match-end 0)))
+ (insert-before-markers (substring string 0 start))
+ (if (= ?\f (aref string start))
+ (progn
+ (if (not (bolp))
+ (insert-before-markers ?\n))
+ (insert-before-markers ?\f))
+ (beep))
+ (setq string (substring string (1+ start)))))
+ (insert-before-markers string)
+ (if (and xscheme-last-input-end
+ (equal (marker-position xscheme-last-input-end) (point)))
+ (set-marker xscheme-last-input-end old-point)))))))
(defun xscheme-guarantee-newlines (n)
(if xscheme-allow-output-p
(setq n (1- n))))))
(defun xscheme-goto-output-point ()
- (let ((process (get-process "scheme")))
+ (let ((process (get-process xscheme-process-name)))
(set-buffer (process-buffer process))
(goto-char (process-mark process))))
-(defun xscheme-modeline-initialize ()
+(defun xscheme-modeline-initialize (name)
(setq xscheme-runlight-string "")
+ (if (equal name (default-value 'xscheme-buffer-name))
+ (setq-default xscheme-runlight-string ""))
(setq xscheme-mode-string "")
- (setq mode-line-buffer-identification '("Scheme: " xscheme-mode-string)))
+ (setq mode-line-buffer-identification
+ (list (concat name ": ")
+ 'xscheme-mode-string)))
(defun xscheme-set-runlight (runlight)
(setq xscheme-runlight-string runlight)
+ (if (equal (buffer-name (current-buffer))
+ (default-value 'xscheme-buffer-name))
+ (setq-default xscheme-runlight-string runlight))
+ (rplaca (nthcdr 3 xscheme-runlight) runlight)
(force-mode-line-update t))
\f
;;;; Process Filter Operations
(defvar xscheme-process-filter-alist
- '((?D xscheme-enter-debugger-mode
+ '((?A xscheme-eval
+ xscheme-process-filter:string-action-noexcursion)
+ (?D xscheme-enter-debugger-mode
xscheme-process-filter:string-action)
(?E xscheme-eval
xscheme-process-filter:string-action)
xscheme-process-filter:simple-action)
(?b xscheme-start-gc
xscheme-process-filter:simple-action)
+ (?c xscheme-unsolicited-read-char
+ xscheme-process-filter:simple-action)
(?e xscheme-finish-gc
xscheme-process-filter:simple-action)
(?f xscheme-exit-input-wait
(?w xscheme-cd
xscheme-process-filter:string-action)
(?z xscheme-display-process-buffer
- xscheme-process-filter:simple-action)
- (?c xscheme-unsolicited-read-char
xscheme-process-filter:simple-action))
"Table used to decide how to handle process filter commands.
Value is a list of entries, each entry is a list of three items.
(setq xscheme-string-accumulator "")
(setq xscheme-process-filter-state 'reading-string))
+(defun xscheme-process-filter:string-action-noexcursion (action)
+ (xscheme-process-filter:string-action (cons action nil)))
+
(defconst xscheme-runlight:running "run"
"The character displayed when the Scheme process is running.")
(defun xscheme-enter-input-wait ()
(xscheme-set-runlight xscheme-runlight:input)
+ (setq xscheme-control-g-disabled-p nil)
(setq xscheme-running-p nil))
(defun xscheme-exit-input-wait ()
(setq xscheme-running-p t))
(defun xscheme-enable-control-g ()
- (setq xscheme-control-g-disabled-p nil))
+ (setq xscheme-control-g-disabled-p nil)
+ (if (string= (current-message) xscheme-control-g-message-string)
+ (message nil)))
(defun xscheme-display-process-buffer ()
(let ((window (or (xscheme-process-buffer-window)
(defun xscheme-write-value (string)
(if (zerop (length string))
- (xscheme-write-message-1 "(no value)" ";No value")
+ (xscheme-write-message-1 "(no value)" ";Unspecified return value")
(xscheme-write-message-1 string (format ";Value: %s" string))))
(defun xscheme-write-message-1 (message-string output-string)
- (let* ((process (get-process "scheme"))
+ (let* ((process (get-process xscheme-process-name))
(window (get-buffer-window (process-buffer process))))
(if (or (not window)
(not (pos-visible-in-window-p (process-mark process)
(xscheme-guarantee-newlines 2))
(defun xscheme-coerce-prompt (string)
- (if (string-match "^[0-9]+ " string)
+ (if (string-match "^[0-9]+ \\[[^]]+\\] " string)
(let ((end (match-end 0)))
- (concat (substring string 0 end)
- (let ((prompt (substring string end)))
- (let ((entry (assoc prompt xscheme-prompt-alist)))
- (if entry
- (cdr entry)
- prompt)))))
+ (xscheme-process-filter-output (substring string end))
+ (substring string 0 (- end 1)))
string))
-(defvar xscheme-prompt-alist
- '(("[Normal REPL]" . "[Evaluator]")
- ("[Error REPL]" . "[Evaluator]")
- ("[Breakpoint REPL]" . "[Evaluator]")
- ("[Debugger REPL]" . "[Evaluator]")
- ("[Visiting environment]" . "[Evaluator]")
- ("[Environment Inspector]" . "[Where]"))
- "An alist which maps the Scheme command interpreter type to a print string.")
-
(defun xscheme-cd (directory-string)
(save-excursion
(set-buffer (xscheme-process-buffer))
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