(require 'ehelp)
(defgroup terminal nil
"Terminal emulator for Emacs."
:group 'terminals)
(defcustom terminal-escape-char ?\C-^
"*All characters except for this are passed verbatim through the
terminal-emulator. This character acts as a prefix for commands
to the emulator program itself. Type this character twice to send
it through the emulator. Type ? after typing it for a list of
possible commands.
This variable is local to each terminal-emulator buffer."
:type 'character
:group 'terminal)
(defcustom terminal-scrolling t "*If non-nil, the terminal-emulator will losingly `scroll' when output occurs
past the bottom of the screen. If nil, output will win and `wrap' to the top
of the screen.
This variable is local to each terminal-emulator buffer."
:type 'boolean
:group 'terminal)
(defcustom terminal-more-processing t
"*If non-nil, do more-processing.
This variable is local to each terminal-emulator buffer."
:type 'boolean
:group 'terminal)
(defcustom terminal-redisplay-interval 5000
"*Maximum number of characters which will be processed by the
terminal-emulator before a screen redisplay is forced.
Set this to a large value for greater throughput,
set it smaller for more frequent updates but overall slower
performance."
:type 'integer
:group 'terminal)
(defvar terminal-more-break-insertion
"*** More break -- Press space to continue ***")
(defvar terminal-meta-map nil)
(if terminal-meta-map
nil
(let ((map (make-sparse-keymap)))
(define-key map [t] 'te-pass-through)
(setq terminal-meta-map map)))
(defvar terminal-map nil)
(if terminal-map
nil
(let ((map (make-sparse-keymap)))
(define-key map [menu-bar] (make-sparse-keymap))
(define-key map [t] 'te-pass-through)
(define-key map [switch-frame] 'handle-switch-frame)
(define-key map "\e" terminal-meta-map)
(setq terminal-map map)))
(defvar terminal-escape-map nil)
(if terminal-escape-map
nil
(let ((map (make-sparse-keymap)))
(define-key map [t] 'undefined)
(let ((s "0"))
(while (<= (aref s 0) ?9)
(define-key map s 'digit-argument)
(aset s 0 (1+ (aref s 0)))))
(define-key map "b" 'switch-to-buffer)
(define-key map "o" 'other-window)
(define-key map "e" 'te-set-escape-char)
(define-key map "\C-l" 'redraw-display)
(define-key map "\C-o" 'te-flush-pending-output)
(define-key map "m" 'te-toggle-more-processing)
(define-key map "x" 'te-escape-extended-command)
(define-key map "w" 'te-edit)
(define-key map "?" 'te-escape-help)
(define-key map (char-to-string help-char) 'te-escape-help)
(setq terminal-escape-map map)))
(defvar te-escape-command-alist nil)
(if te-escape-command-alist
nil
(setq te-escape-command-alist
'(("Set Escape Character" . te-set-escape-char)
("Edit" . te-edit)
("Refresh" . redraw-display)
("Record Output" . te-set-output-log)
("Photo" . te-set-output-log)
("Tofu" . te-tofu) ("Stuff Input" . te-stuff-string)
("Flush Pending Output" . te-flush-pending-output)
("Enable More Processing" . te-enable-more-processing)
("Disable More Processing" . te-disable-more-processing)
("Scroll at end of page" . te-do-scrolling)
("Wrap at end of page" . te-do-wrapping)
("Switch To Buffer" . switch-to-buffer)
("Other Window" . other-window)
("Kill Buffer" . kill-buffer)
("Help" . te-escape-help)
("Set Redisplay Interval" . te-set-redisplay-interval)
)))
(defvar terminal-more-break-map nil)
(if terminal-more-break-map
nil
(let ((map (make-sparse-keymap)))
(define-key map [t] 'te-more-break-unread)
(define-key map (char-to-string help-char) 'te-more-break-help)
(define-key map " " 'te-more-break-resume)
(define-key map "\C-l" 'redraw-display)
(define-key map "\C-o" 'te-more-break-flush-pending-output)
(define-key map "\r" 'te-more-break-advance-one-line)
(setq terminal-more-break-map map)))
(defvar te-process nil)
(defvar te-log-buffer nil)
(defvar te-height nil)
(defvar te-width nil)
(defvar te-more-count nil)
(defvar te-redisplay-count nil)
(defvar te-pending-output nil)
(defvar te-saved-point)
(defvar te-more-old-point nil)
(defvar te-more-old-local-map nil)
(defvar te-more-old-filter nil)
(defvar te-more-old-mode-line-format nil)
(defvar te-pending-output-info nil)
(defconst te-terminal-name-prefix "emacs-em"
"Prefix used for terminal type names for Terminfo.")
(defconst te-terminfo-directory
(file-name-as-directory
(expand-file-name "emacs-terminfo" temporary-file-directory))
"Directory used for run-time terminal definition files for Terminfo.")
(defvar te-terminal-name nil)
(defun te-escape ()
(interactive)
(let (s
(local (current-local-map))
(global (current-global-map)))
(unwind-protect
(progn
(use-global-map terminal-escape-map)
(use-local-map terminal-escape-map)
(setq s (read-key-sequence
(if current-prefix-arg
(format "Emacs Terminal escape[%s for help]> %d "
(substitute-command-keys
"\\<terminal-escape-map>\\[te-escape-help]")
(prefix-numeric-value current-prefix-arg))
(format "Emacs Terminal escape[%s for help]> "
(substitute-command-keys
"\\<terminal-escape-map>\\[te-escape-help]"))))))
(use-global-map global)
(use-local-map local))
(message "")
(cond
((and (stringp s)
(string= s (make-string 1 terminal-escape-char)))
(setq last-command-char terminal-escape-char)
(let ((terminal-escape-char -259))
(te-pass-through)))
((setq s (lookup-key terminal-escape-map s))
(call-interactively s)))
))
(defun te-escape-help ()
"Provide help on commands available after terminal-escape-char is typed."
(interactive)
(message "Terminal emulator escape help...")
(let ((char (single-key-description terminal-escape-char)))
(with-electric-help
(function (lambda ()
(princ (format "Terminal-emulator escape, invoked by \"%s\"
Type \"%s\" twice to send a single \"%s\" through.
Other chars following \"%s\" are interpreted as follows:\n"
char char char char))
(princ (substitute-command-keys "\\{terminal-escape-map}\n"))
(princ (format "\nSubcommands of \"%s\" (%s)\n"
(where-is-internal 'te-escape-extended-command
terminal-escape-map t)
'te-escape-extended-command))
(let ((l (sort (copy-sequence te-escape-command-alist)
(function (lambda (a b)
(string< (car a) (car b)))))))
(while l
(let ((doc (or (documentation (cdr (car l)))
"Not documented")))
(if (string-match "\n" doc)
(setq doc (substring doc 0 (match-beginning 0))))
(princ " \"")
(princ (car (car l)))
(princ "\":\n ")
(princ doc)
(write-char ?\n))
(setq l (cdr l))))
nil)))))
(defun te-escape-extended-command ()
(interactive)
(let ((c (let ((completion-ignore-case t))
(completing-read "terminal command: "
te-escape-command-alist
nil t))))
(if c
(catch 'foo
(setq c (downcase c))
(let ((l te-escape-command-alist))
(while l
(if (string= c (downcase (car (car l))))
(throw 'foo (call-interactively (cdr (car l))))
(setq l (cdr l)))))))))
(defun te-escape-extended-command-unread ()
(interactive)
(setq unread-command-events (listify-key-sequence (this-command-keys)))
(te-escape-extended-command))
(defun te-set-escape-char (c)
"Change the terminal-emulator escape character."
(interactive "cSet escape character to: ")
(let ((o terminal-escape-char))
(message (if (= o c)
"\"%s\" is the escape char"
"\"%s\" is now the escape; \"%s\" passes through")
(single-key-description c)
(single-key-description o))
(setq terminal-escape-char c)))
(defun te-stuff-string (string)
"Read a string to send to through the terminal emulator
as though that string had been typed on the keyboard.
Very poor man's file transfer protocol."
(interactive "sStuff string: ")
(process-send-string te-process string))
(defun te-set-output-log (name)
"Record output from the terminal emulator in a buffer."
(interactive (list (if te-log-buffer
nil
(read-buffer "Record output in buffer: "
(format "%s output-log"
(buffer-name (current-buffer)))
nil))))
(if (or (null name) (equal name ""))
(progn (setq te-log-buffer nil)
(message "Output logging off."))
(if (get-buffer name)
nil
(save-excursion
(set-buffer (get-buffer-create name))
(fundamental-mode)
(buffer-disable-undo (current-buffer))
(erase-buffer)))
(setq te-log-buffer (get-buffer name))
(message "Recording terminal emulator output into buffer \"%s\""
(buffer-name te-log-buffer))))
(defun te-tofu ()
"Discontinue output log."
(interactive)
(te-set-output-log nil))
(defun te-toggle (sym arg)
(set sym (cond ((not (numberp arg)) arg)
((= arg 1) (not (symbol-value sym)))
((< arg 0) nil)
(t t))))
(defun te-toggle-more-processing (arg)
(interactive "p")
(message (if (te-toggle 'terminal-more-processing arg)
"More processing on" "More processing off"))
(if terminal-more-processing (setq te-more-count -1)))
(defun te-toggle-scrolling (arg)
(interactive "p")
(message (if (te-toggle 'terminal-scrolling arg)
"Scroll at end of page" "Wrap at end of page")))
(defun te-enable-more-processing ()
"Enable ** MORE ** processing"
(interactive)
(te-toggle-more-processing t))
(defun te-disable-more-processing ()
"Disable ** MORE ** processing"
(interactive)
(te-toggle-more-processing nil))
(defun te-do-scrolling ()
"Scroll at end of page (yuck)"
(interactive)
(te-toggle-scrolling t))
(defun te-do-wrapping ()
"Wrap to top of window at end of page"
(interactive)
(te-toggle-scrolling nil))
(defun te-set-redisplay-interval (arg)
"Set the maximum interval (in output characters) between screen updates.
Set this number to large value for greater throughput,
set it smaller for more frequent updates (but overall slower performance."
(interactive "NMax number of output chars between redisplay updates: ")
(setq arg (max arg 1))
(setq terminal-redisplay-interval arg
te-redisplay-count 0))
(put 'te-more-break-unread 'suppress-keymap t)
(defun te-more-break-unread ()
(interactive)
(if (eq last-input-char terminal-escape-char)
(call-interactively 'te-escape)
(message "Continuing from more break (\"%s\" typed, %d chars output pending...)"
(single-key-description last-input-char)
(te-pending-output-length))
(setq te-more-count 259259)
(te-more-break-unwind)
(let ((terminal-more-processing nil))
(te-pass-through))))
(defun te-more-break-resume ()
"Proceed past the **MORE** break,
allowing the next page of output to appear"
(interactive)
(message "Continuing from more break")
(te-more-break-unwind))
(defun te-more-break-help ()
"Provide help on commands available in a terminal-emulator **MORE** break"
(interactive)
(message "Terminal-emulator more break help...")
(sit-for 0)
(with-electric-help
(function (lambda ()
(princ "Terminal-emulator more break.\n\n")
(princ (format "Type \"%s\" (te-more-break-resume)\n%s\n"
(where-is-internal 'te-more-break-resume
terminal-more-break-map t)
(documentation 'te-more-break-resume)))
(princ (substitute-command-keys "\\{terminal-more-break-map}\n"))
(princ "Any other key is passed through to the program
running under the terminal emulator and disables more processing until
all pending output has been dealt with.")
nil))))
(defun te-more-break-advance-one-line ()
"Allow one more line of text to be output before doing another more break."
(interactive)
(setq te-more-count 1)
(te-more-break-unwind))
(defun te-more-break-flush-pending-output ()
"Discard any output which has been received by the terminal emulator but
not yet processed and then proceed from the more break."
(interactive)
(te-more-break-unwind)
(te-flush-pending-output))
(defun te-flush-pending-output ()
"Discard any as-yet-unprocessed output which has been received by
the terminal emulator."
(interactive)
(if (null (cdr te-pending-output))
(message "(There is no output pending)")
(let ((length (te-pending-output-length)))
(message "Flushing %d chars of pending output" length)
(setq te-pending-output
(list 0 (format "\n*** %d chars of pending output flushed ***\n"
length)))
(te-update-pending-output-display)
(te-process-output nil)
(sit-for 0))))
(defun te-pass-through ()
"Character is passed to the program running under the terminal emulator.
One characters is treated specially:
the terminal escape character (normally C-^)
lets you type a terminal emulator command."
(interactive)
(cond ((eq last-input-char terminal-escape-char)
(call-interactively 'te-escape))
(t
(if (and (symbolp last-input-char)
(get last-input-char 'ascii-character))
(setq last-input-char (get last-input-char 'ascii-character)))
(if (and (integerp last-input-char)
(not (zerop (logand last-input-char ?\M-\^@))))
(setq last-input-char (+ 128 (logand last-input-char 127))))
(if (integerp last-input-char)
(progn
(and terminal-more-processing (null (cdr te-pending-output))
(te-set-more-count nil))
(process-send-string te-process (make-string 1 last-input-char))
(te-process-output t))
(message "Function key `%s' ignored"
(single-key-description last-input-char))))))
(defun te-set-window-start ()
(let* ((w (get-buffer-window (current-buffer)))
(h (if w (window-height w))))
(cond ((not w)) ((>= h (/ (- (point) (point-min)) (1+ te-width)))
(set-window-start w (point-min)))
((>= h (/ (- (point-max) (point)) (1+ te-width)))
(set-window-start w (- (point-max) (* h (1+ te-width)) -1)))
(t nil))))
(defun te-pending-output-length ()
(let ((length (car te-pending-output))
(tem (cdr te-pending-output)))
(while tem
(setq length (+ length (length (car tem))) tem (cdr tem)))
length))
(defvar terminal-edit-map nil)
(if terminal-edit-map
nil
(setq terminal-edit-map (make-sparse-keymap))
(define-key terminal-edit-map "\C-c\C-c" 'terminal-cease-edit))
(put 'terminal-edit-mode 'mode-class 'special)
(defun terminal-edit-mode ()
"Major mode for editing the contents of a terminal-emulator buffer.
The editing commands are the same as in Fundamental mode,
together with a command \\<terminal-edit-map>to return to terminal emulation: \\[terminal-cease-edit]."
(use-local-map terminal-edit-map)
(setq major-mode 'terminal-edit-mode)
(setq mode-name "Terminal Edit")
(setq mode-line-modified (default-value 'mode-line-modified))
(setq mode-line-process nil)
(run-mode-hooks 'terminal-edit-mode-hook))
(defun te-edit ()
"Start editing the terminal emulator buffer with ordinary Emacs commands."
(interactive)
(terminal-edit-mode)
(force-mode-line-update)
(if (eq (key-binding "\C-c\C-c") 'terminal-cease-edit)
(message "Editing: Type C-c C-c to return to Terminal")
(message "%s"
(substitute-command-keys
"Editing: Type \\[terminal-cease-edit] to return to Terminal"))))
(defun terminal-cease-edit ()
"Finish editing message; switch back to Terminal proper."
(interactive)
(let ((buffer-read-only nil))
(widen)
(let ((opoint (point-marker))
(width te-width)
(h (1- te-height)))
(goto-char (point-min))
(while (>= h 0)
(let ((p (point)))
(cond ((search-forward "\n" (+ p width) 'move)
(forward-char -1)
(insert-char ?\s (- width (- (point) p)))
(forward-char 1))
((eobp)
(insert-char ?\s (- width (- (point) p))))
((= (following-char) ?\n)
(forward-char 1))
(t
(setq p (point))
(if (search-forward "\n" nil t)
(delete-region p (1- (point)))
(delete-region p (point-max))))))
(if (= h 0)
(if (not (eobp)) (delete-region (point) (point-max)))
(if (eobp) (insert ?\n)))
(setq h (1- h)))
(goto-char opoint)
(set-marker opoint nil nil)
(setq te-saved-point (point))
(setq te-redisplay-count 0)
(setq te-more-count -1)))
(setq mode-line-modified (default-value 'mode-line-modified))
(use-local-map terminal-map)
(setq major-mode 'terminal-mode)
(setq mode-name "terminal")
(setq mode-line-process '(":%s")))
(defun te-more-break ()
(te-set-more-count t)
(make-local-variable 'te-more-old-point)
(setq te-more-old-point (point))
(make-local-variable 'te-more-old-local-map)
(setq te-more-old-local-map (current-local-map))
(use-local-map terminal-more-break-map)
(make-local-variable 'te-more-old-filter)
(setq te-more-old-filter (process-filter te-process))
(make-local-variable 'te-more-old-mode-line-format)
(setq te-more-old-mode-line-format mode-line-format
mode-line-format (list "-- **MORE** "
mode-line-buffer-identification
"%-"))
(set-process-filter te-process
(function (lambda (process string)
(save-excursion
(set-buffer (process-buffer process))
(setq te-pending-output (nconc te-pending-output
(list string))))
(te-update-pending-output-display))))
(te-update-pending-output-display)
(if (eq (window-buffer (selected-window)) (current-buffer))
(message "More break "))
(or (eobp)
(null terminal-more-break-insertion)
(save-excursion
(forward-char 1)
(delete-region (point) (+ (point) te-width))
(insert terminal-more-break-insertion)))
(run-hooks 'terminal-more-break-hook)
(sit-for 0) (throw 'te-process-output t))
(defun te-more-break-unwind ()
(use-local-map te-more-old-local-map)
(set-process-filter te-process te-more-old-filter)
(goto-char te-more-old-point)
(setq mode-line-format te-more-old-mode-line-format)
(force-mode-line-update)
(let ((buffer-read-only nil))
(cond ((eobp))
(terminal-more-break-insertion
(forward-char 1)
(delete-region (point)
(+ (point) (length terminal-more-break-insertion)))
(insert-char ?\s te-width)
(goto-char te-more-old-point)))
(setq te-more-old-point nil)
(let ((te-more-count 259259))
(te-newline)))
(te-process-output t))
(defun te-set-more-count (newline)
(let ((line (/ (- (point) (point-min)) (1+ te-width))))
(if newline (setq line (1+ line)))
(cond ((= line te-height)
(setq te-more-count te-height))
((= line (1- te-height))
(setq te-more-count te-height))
((or (< line (/ te-height 2))
(> (- te-height line) 10))
(setq te-more-count (- te-height line)))
(t
(setq te-more-count (- te-height
(if (> te-height 10) 2 1)))))))
(defun te-newline ()
"Move down a line, optionally do more processing, perhaps wrap/scroll,
move to start of new line, clear to end of line."
(end-of-line)
(cond ((not terminal-more-processing))
((< (setq te-more-count (1- te-more-count)) 0)
(te-set-more-count t))
((eq te-more-count 0)
(te-more-break)))
(if (eobp)
(progn
(delete-region (point-min) (+ (point-min) te-width))
(goto-char (point-min))
(if terminal-scrolling
(progn (delete-char 1)
(goto-char (point-max))
(insert ?\n))))
(forward-char 1)
(delete-region (point) (+ (point) te-width)))
(insert-char ?\s te-width)
(beginning-of-line)
(te-set-window-start))
(defun te-move-to-position ()
(let ((y (- (te-get-char) 32))
(x (- (te-get-char) 32)))
(if (or (> x te-width)
(> y te-height))
()
(goto-char (+ (point-min) x (* y (1+ te-width))))
))
(setq te-more-count -1))
(defun te-clear-rest-of-line ()
(save-excursion
(let ((n (- (point) (progn (end-of-line) (point)))))
(delete-region (point) (+ (point) n))
(insert-char ?\s (- n)))))
(defun te-clear-rest-of-screen ()
(save-excursion
(te-clear-rest-of-line)
(while (progn (end-of-line) (not (eobp)))
(forward-char 1) (end-of-line)
(delete-region (- (point) te-width) (point))
(insert-char ?\s te-width))))
(defun te-clear-screen ()
(erase-buffer)
(let ((i 0))
(while (< i te-height)
(setq i (1+ i))
(insert-char ?\s te-width)
(insert ?\n)))
(delete-region (1- (point-max)) (point-max))
(goto-char (point-min))
(setq te-more-count -1))
(defun te-insert-lines ()
(if (not (bolp))
() (save-excursion
(let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
(n (min (- (te-get-char) ?\s) line))
(i 0))
(delete-region (- (point-max) (* n (1+ te-width))) (point-max))
(if (eq (point) (point-max)) (insert ?\n))
(while (< i n)
(setq i (1+ i))
(insert-char ?\s te-width)
(or (eq i line) (insert ?\n))))))
(setq te-more-count -1))
(defun te-delete-lines ()
(if (not (bolp))
() (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
(n (min (- (te-get-char) ?\s) line))
(i 0))
(delete-region (point)
(min (+ (point) (* n (1+ te-width))) (point-max)))
(save-excursion
(goto-char (point-max))
(while (< i n)
(setq i (1+ i))
(insert-char ?\s te-width)
(or (eq i line) (insert ?\n))))))
(setq te-more-count -1))
(defun te-beginning-of-line ()
(beginning-of-line))
(defun te-backward-char ()
(if (not (bolp))
(backward-char 1)))
(defun te-forward-char ()
(if (not (eolp))
(forward-char 1)))
(defun te-delete ()
(if (bolp)
()
(delete-region (1- (point)) (point))
(insert ?\s)
(forward-char -1)))
(defun te-beep ()
(beep))
(defun te-insert-spaces ()
(let* ((p (point))
(n (min (- (te-get-char) 32)
(- (progn (end-of-line) (point)) p))))
(if (<= n 0)
nil
(delete-char (- n))
(goto-char p)
(insert-char ?\s n))
(goto-char p)))
(defun te-delete-char ()
(let* ((p (point))
(n (min (- (te-get-char) 32)
(- (progn (end-of-line) (point)) p))))
(if (<= n 0)
nil
(insert-char ?\s n)
(goto-char p)
(delete-char n))
(goto-char p)))
(defun te-losing-unix ()
nil)
(defun te-output-tab ()
(let* ((p (point))
(x (- p (progn (beginning-of-line) (point))))
(l (min (- 8 (logand x 7))
(progn (end-of-line) (- (point) p)))))
(goto-char (+ p l))))
(defun te-down-vertically-or-scroll ()
"Move down a line vertically, or scroll at bottom."
(let ((column (current-column)))
(end-of-line)
(if (eobp)
(progn
(delete-region (point-min) (+ (point-min) te-width))
(goto-char (point-min))
(delete-char 1)
(goto-char (point-max))
(insert ?\n)
(insert-char ?\s te-width)
(beginning-of-line))
(forward-line 1))
(move-to-column column))
(te-set-window-start))
(defun te-filter (process string)
(let* ((obuf (current-buffer)))
(unwind-protect
(progn
(set-buffer (process-buffer process))
(goto-char te-saved-point)
(and (bufferp te-log-buffer)
(if (null (buffer-name te-log-buffer))
(setq te-log-buffer nil)
(set-buffer te-log-buffer)
(goto-char (point-max))
(insert-before-markers string)
(set-buffer (process-buffer process))))
(setq te-pending-output (nconc te-pending-output (list string)))
(te-update-pending-output-display)
(te-process-output (eq (current-buffer)
(window-buffer (selected-window))))
(set-buffer (process-buffer process))
(setq te-saved-point (point)))
(set-buffer obuf))))
(defun te-process-output (preemptible)
(setq preemptible t)
(catch 'te-process-output
(let ((buffer-read-only nil)
(string nil) ostring start char (matchpos nil))
(while (cdr te-pending-output)
(setq ostring string
start (car te-pending-output)
string (car (cdr te-pending-output))
char (aref string start))
(if (eq (setq start (1+ start)) (length string))
(progn (setq te-pending-output
(cons 0 (cdr (cdr te-pending-output)))
start 0
string (car (cdr te-pending-output)))
(te-update-pending-output-display))
(setcar te-pending-output start))
(if (and (> char ?\037) (< char ?\377))
(cond ((eolp)
(if (eq start 0)
(setq te-pending-output
(cons 0 (cons (make-string 1 char)
(cdr te-pending-output))))
(setcar te-pending-output (1- start)))
(te-newline))
((null string)
(delete-char 1) (insert char)
(te-redisplay-if-necessary 1))
(t
(let ((end (or (and (eq ostring string) matchpos)
(setq matchpos (string-match
"[\000-\037\177-\377]"
string start))
(length string))))
(delete-char 1) (insert char)
(setq char (point)) (end-of-line)
(setq end (min end (+ start (- (point) char))))
(goto-char char)
(if (eq end matchpos) (setq matchpos nil))
(delete-region (point) (+ (point) (- end start)))
(insert (if (and (eq start 0)
(eq end (length string)))
string
(substring string start end)))
(if (eq end (length string))
(setq te-pending-output
(cons 0 (cdr (cdr te-pending-output))))
(setcar te-pending-output end))
(te-redisplay-if-necessary (1+ (- end start))))))
(funcall
(if (eq char ?\^p)
(or (cdr (assq (te-get-char)
'((?= . te-move-to-position)
(?c . te-clear-rest-of-line)
(?C . te-clear-rest-of-screen)
(?\C-o . te-insert-lines)
(?\C-k . te-delete-lines)
(?\C-a . te-beginning-of-line)
(?\C-b . te-backward-char)
(?d . te-delete-char)
(?_ . te-insert-spaces)
(?\C-f . te-forward-char)
(?\C-g . te-beep)
(?\C-j . te-down-vertically-or-scroll)
(?\C-l . te-clear-screen)
)))
'te-losing-unix)
(or (cdr (assq char
'((?\C-j . te-newline)
(?\177 . te-delete)
(?\C-m . te-beginning-of-line)
(?\C-g . te-beep)
(?\C-h . te-backward-char)
(?\C-i . te-output-tab))))
'te-losing-unix)))
(te-redisplay-if-necessary 1))
(and preemptible
(input-pending-p)
(throw 'te-process-output t)))))
(walk-windows (lambda (w)
(when (and (not (eq w (selected-window)))
(eq (window-buffer w) (current-buffer)))
(set-window-point w (point))))))
(defun te-get-char ()
(if (cdr te-pending-output)
(let ((start (car te-pending-output))
(string (car (cdr te-pending-output))))
(prog1 (aref string start)
(if (eq (setq start (1+ start)) (length string))
(setq te-pending-output (cons 0 (cdr (cdr te-pending-output))))
(setcar te-pending-output start))))
(catch 'char
(let ((filter (process-filter te-process)))
(unwind-protect
(progn
(set-process-filter te-process
(function (lambda (p s)
(or (eq (length s) 1)
(setq te-pending-output (list 1 s)))
(throw 'char (aref s 0)))))
(accept-process-output te-process))
(set-process-filter te-process filter))))))
(defun te-redisplay-if-necessary (length)
(and (<= (setq te-redisplay-count (- te-redisplay-count length)) 0)
(eq (current-buffer) (window-buffer (selected-window)))
(waiting-for-user-input-p)
(progn (te-update-pending-output-display)
(sit-for 0)
(setq te-redisplay-count terminal-redisplay-interval))))
(defun te-update-pending-output-display ()
(if (null (cdr te-pending-output))
(setq te-pending-output-info "")
(let ((length (te-pending-output-length)))
(if (< length 1500)
(setq te-pending-output-info "")
(setq te-pending-output-info (format "(%dK chars output pending) "
(/ (+ length 512) 1024))))))
(force-mode-line-update))
(defun te-sentinel (process message)
(cond ((eq (process-status process) 'run))
((null (buffer-name (process-buffer process)))) (t (let ((b (current-buffer)))
(save-excursion
(set-buffer (process-buffer process))
(setq buffer-read-only nil)
(fundamental-mode)
(goto-char (point-max))
(delete-blank-lines)
(delete-horizontal-space)
(insert "\n*******\n" message "*******\n"))
(if (and (eq b (process-buffer process))
(waiting-for-user-input-p))
(progn (goto-char (point-max))
(recenter -1)))))))
(defvar te-stty-string "stty -nl erase '^?' kill '^u' intr '^c' echo pass8"
"Shell command to set terminal modes for terminal emulator.")
(defcustom explicit-shell-file-name nil
"*If non-nil, is file name to use for explicitly requested inferior shell."
:type '(choice (const :tag "None" nil)
file)
:group 'terminal)
(defun terminal-emulator (buffer program args &optional width height)
"Under a display-terminal emulator in BUFFER, run PROGRAM on arguments ARGS.
ARGS is a list of argument-strings. Remaining arguments are WIDTH and HEIGHT.
BUFFER's contents are made an image of the display generated by that program,
and any input typed when BUFFER is the current Emacs buffer is sent to that
program as keyboard input.
Interactively, BUFFER defaults to \"*terminal*\" and PROGRAM and ARGS
are parsed from an input-string using your usual shell.
WIDTH and HEIGHT are determined from the size of the current window
-- WIDTH will be one less than the window's width, HEIGHT will be its height.
To switch buffers and leave the emulator, or to give commands
to the emulator itself (as opposed to the program running under it),
type Control-^. The following character is an emulator command.
Type Control-^ twice to send it to the subprogram.
This escape character may be changed using the variable `terminal-escape-char'.
`Meta' characters may not currently be sent through the terminal emulator.
Here is a list of some of the variables which control the behavior
of the emulator -- see their documentation for more information:
terminal-escape-char, terminal-scrolling, terminal-more-processing,
terminal-redisplay-interval.
This function calls the value of terminal-mode-hook if that exists
and is non-nil after the terminal buffer has been set up and the
subprocess started."
(interactive
(cons (save-excursion
(set-buffer (get-buffer-create "*terminal*"))
(buffer-name (if (or (not (boundp 'te-process))
(null te-process)
(not (eq (process-status te-process)
'run)))
(current-buffer)
(generate-new-buffer "*terminal*"))))
(append
(let* ((default-s
(or explicit-shell-file-name
(getenv "ESHELL")
(getenv "SHELL")
"/bin/sh"))
(s (read-string
(format "Run program in emulator (default %s): "
default-s))))
(if (equal s "")
(list default-s '())
(te-parse-program-and-args s))))))
(switch-to-buffer buffer)
(if (null width) (setq width (- (window-width (selected-window)) 1)))
(if (null height) (setq height (- (window-height (selected-window)) 1)))
(terminal-mode)
(setq te-width width te-height height)
(setq te-terminal-name (concat te-terminal-name-prefix
(number-to-string te-width)
(number-to-string te-height)))
(setq mode-line-buffer-identification
(list (format "Emacs terminal %dx%d: %%b " te-width te-height)
'te-pending-output-info))
(let ((buffer-read-only nil))
(te-clear-screen))
(let (process)
(while (setq process (get-buffer-process (current-buffer)))
(if (y-or-n-p (format "Kill process %s? " (process-name process)))
(delete-process process)
(error "Process %s not killed" (process-name process)))))
(condition-case err
(let ((process-environment
(cons (concat "TERM=" te-terminal-name)
(cons (concat "TERMCAP=" (te-create-termcap))
(cons (concat "TERMINFO=" (te-create-terminfo))
process-environment)))))
(setq te-process
(start-process "terminal-emulator" (current-buffer)
"/bin/sh" "-c"
(format "%s; exec %s"
te-stty-string
(mapconcat 'te-quote-arg-for-sh
(cons program args) " "))))
(set-process-filter te-process 'te-filter)
(set-process-sentinel te-process 'te-sentinel))
(error (fundamental-mode)
(signal (car err) (cdr err))))
(setq inhibit-quit t) (use-local-map terminal-map)
(run-hooks 'terminal-mode-hook)
(message "Entering Emacs terminal-emulator... Type %s %s for help"
(single-key-description terminal-escape-char)
(mapconcat 'single-key-description
(where-is-internal 'te-escape-help terminal-escape-map t)
" ")))
(defun te-parse-program-and-args (s)
(cond ((string-match "\\`\\([-a-zA-Z0-9+=_.@/:]+[ \t]*\\)+\\'" s)
(let ((l ()) (p 0))
(while p
(setq l (cons (if (string-match
"\\([-a-zA-Z0-9+=_.@/:]+\\)\\([ \t]+\\)*"
s p)
(prog1 (substring s p (match-end 1))
(setq p (match-end 0))
(if (eq p (length s)) (setq p nil)))
(prog1 (substring s p)
(setq p nil)))
l)))
(setq l (nreverse l))
(list (car l) (cdr l))))
((and (string-match "[ \t]" s) (not (file-exists-p s)))
(list shell-file-name (list "-c" (concat "exec " s))))
(t (list s ()))))
(put 'terminal-mode 'mode-class 'special)
(defun terminal-mode ()
"Set up variables for use with the terminal-emulator.
One should not call this -- it is an internal function
of the terminal-emulator"
(kill-all-local-variables)
(buffer-disable-undo (current-buffer))
(setq major-mode 'terminal-mode)
(setq mode-name "terminal")
(setq mode-line-process '(":%s"))
(setq buffer-read-only t)
(setq truncate-lines t)
(make-local-variable 'terminal-escape-char)
(setq terminal-escape-char (default-value 'terminal-escape-char))
(make-local-variable 'terminal-scrolling)
(setq terminal-scrolling (default-value 'terminal-scrolling))
(make-local-variable 'terminal-more-processing)
(setq terminal-more-processing (default-value 'terminal-more-processing))
(make-local-variable 'terminal-redisplay-interval)
(setq terminal-redisplay-interval (default-value 'terminal-redisplay-interval))
(make-local-variable 'te-width)
(make-local-variable 'te-height)
(make-local-variable 'te-process)
(make-local-variable 'te-pending-output)
(setq te-pending-output (list 0))
(make-local-variable 'te-saved-point)
(setq te-saved-point (point-min))
(make-local-variable 'te-pending-output-info) (setq te-pending-output-info "")
(make-local-variable 'inhibit-quit)
(make-local-variable 'te-log-buffer)
(setq te-log-buffer nil)
(make-local-variable 'te-more-count)
(setq te-more-count -1)
(make-local-variable 'te-redisplay-count)
(setq te-redisplay-count terminal-redisplay-interval)
)
(defun te-quote-arg-for-sh (string)
(cond ((string-match "\\`[-a-zA-Z0-9+=_.@/:]+\\'"
string)
string)
((not (string-match "[$]" string))
(prin1-to-string string))
(t
(let ((harder "")
(start 0)
(end 0))
(while (cond ((>= start (length string))
nil)
((setq end (string-match "[\"\\$]"
string start))
t)
(t (setq harder (concat harder
(substring string start)))
nil))
(setq harder (concat harder (substring string start end)
"\\"
(substring string
end
(1+ end)))
start (1+ end)))
(concat "\"" harder "\"")))))
(defun te-create-terminfo ()
"Create and compile a terminfo entry for the virtual terminal. This is kept
in the directory specified by `te-terminfo-directory'."
(when (and system-uses-terminfo
(not (file-exists-p (concat te-terminfo-directory
(substring te-terminal-name-prefix 0 1)
"/" te-terminal-name))))
(let ( (terminfo
(concat
(format "%s,\n\tmir, xon,cols#%d, lines#%d,"
te-terminal-name te-width te-height)
"bel=^P^G, clear=^P\\f, cr=^P^A, cub1=^P^B, cud1=^P\\n,"
"cuf1=^P^F, cup=^P=%p1%'\\s'%+%c%p2%'\\s'%+%c,"
"dch=^Pd%p1%'\\s'%+%c, dch1=^Pd!, dl=^P^K%p1%'\\s'%+%c,"
"dl1=^P^K!, ed=^PC, el=^Pc, home=^P=\\s\\s,"
"ich=^P_%p1%'\\s'%+%c, ich1=^P_!, il=^P^O%p1%'\\s'%+%c,"
"il1=^P^O!, ind=^P\\n, nel=\\n,\n"))
(file-name (concat te-terminfo-directory te-terminal-name ".tif")) )
(make-directory te-terminfo-directory t)
(let ((temp-file
(make-temp-file (expand-file-name "tif" te-terminfo-directory))))
(with-temp-file temp-file
(insert terminfo))
(rename-file temp-file file-name))
(let ((process-environment
(cons (concat "TERMINFO="
(directory-file-name te-terminfo-directory))
process-environment)))
(set-process-sentinel (start-process "tic" nil "tic" file-name)
'te-tic-sentinel))))
(directory-file-name te-terminfo-directory))
(defun te-create-termcap ()
"Create a termcap entry for the virtual terminal"
(concat (format "%s:co#%d:li#%d:%s"
te-terminal-name te-width te-height (if terminal-scrolling
"" "ns:"))
"cm=^p=%+ %+ :cr=^p^a:le=^p^b:nd=^p^f:"
"nw=^j:ce=^pc:cd=^pC:cl=^p^l:bl=^p^g:"
"IC=^p_%+ :DC=^pd%+ :AL=^p^o%+ :DL=^p^k%+ :"
"LP:NF:"
"ic=^p_!:dc=^pd!:al=^p^o!:dl=^p^k!:ho=^p= :"
"im=:ei=:dm=:ed=:mi:do=^p^j:nl=^p^j:bs:")
)
(defun te-tic-sentinel (proc state-change)
"If tic has finished, delete the .tif file"
(if (equal state-change "finished
")
(delete-file (concat te-terminfo-directory te-terminal-name ".tif"))))
(provide 'terminal)