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;;;; TOPLEVEL INPUT HISTORY
;;; Aug 1991, (c) Toshihiro MATSUI, Electrotechnical Laboratory
;;
;; line editor
;; (in-package "LISP")
;; need tty module to switch between raw and cooked mode
(require 'tty "tty")
(export '(*line-edit-dispatch* refresh-line line-head line-left
line-right line-delch line-delch-previous line-tail
line-refresh line-insert line-null line-abort line-end line-edit
*history-max* *history* *history-index* *history-sequence*
new-history add-history print-history h get-history !))
;; line editor command dispatch table
(defvar *line-edit-dispatch* (make-array 128))
(defun refresh-line (str start end)
(cursor-pos start)
(erase-eol)
(dotimes (i (- end start))
(write-byte (elt str (+ i start)) *terminal-io*) )
(cursor-pos start) )
(defun line-head (ch line index end)
(cursor-pos 0)
(list line 0 end))
(defun line-left (ch line index end)
(if (> index 0) (cursor-backward) )
(list line (max 0 (1- index)) end) )
(defun line-right (ch line index end)
(when (< index end) (cursor-forward) (incf index))
(list line index end) )
(defun line-delch (ch line index end)
(when (< index end)
(setq line (list-delete line index))
(decf end)
(refresh-line line index end))
(list line index end))
(defun line-delch-previous (ch line index end)
(when (> index 0)
(decf index)
(setq line (list-delete line index))
(decf end)
(refresh-line line index end))
(list line index end))
(defun line-tail (ch line index end)
(cursor-pos end)
(list line end end))
(defun line-refresh (ch line index end)
(refresh-line line 0 end)
(cursor-pos index)
(list line end end))
(defun line-insert (ch line index end)
(setq line (list-insert ch index line))
(incf end)
(refresh-line line index end)
(incf index)
(cursor-forward)
(list line index end))
(defun line-clear (ch line index end)
(cursor-pos 0)
(erase-eol)
(list '( ) 0 0))
(defun line-null (ch line index end) (list line index end))
(defun line-abort (ch line index end) (throw 'line-edit nil))
(defun line-end (ch line index end) (throw 'line-edit line))
;; initialize dispatch table
(dotimes (i 128)
(setf (aref *line-edit-dispatch* i) 'line-insert) )
(dotimes (i 32)
(setf (aref *line-edit-dispatch* i) 'line-null) )
(setf (aref *line-edit-dispatch* 1) 'line-head) ;^A
(setf (aref *line-edit-dispatch* 2) 'line-left) ;^B
(setf (aref *line-edit-dispatch* 3) 'line-abort) ;^C
(setf (aref *line-edit-dispatch* 4) 'line-delch) ;^D
(setf (aref *line-edit-dispatch* 6) 'line-right) ;^F
(setf (aref *line-edit-dispatch* 7) 'line-refresh) ;^G
(setf (aref *line-edit-dispatch* 8) 'line-left) ;^H
(setf (aref *line-edit-dispatch* 10) 'line-end) ;^J
(setf (aref *line-edit-dispatch* 11) 'line-right) ;^K
(setf (aref *line-edit-dispatch* 12) 'line-tail) ;^L
(setf (aref *line-edit-dispatch* 13) 'line-end) ;^M
(setf (aref *line-edit-dispatch* 18) 'line-refresh) ;^R
(setf (aref *line-edit-dispatch* 21) 'line-clear) ;^u
(setf (aref *line-edit-dispatch* 127) 'line-delch-previous)
(defun line-edit (line)
"line (string) is edited and returned"
(let* ((linelist (coerce line cons)) result
(ch) (end (length line)) (index end) func)
(format t "; ~%~a" line)
(tty-raw)
(cursor-pos end)
(finish-output)
(setq ch (read-char))
(setq result
(catch 'line-edit
(while t
(setq result
(funcall (aref *line-edit-dispatch* ch)
ch linelist index end) )
(finish-output *terminal-io*)
(setq linelist (car result)
index (cadr result)
end (caddr result))
(setq ch (read-char)) ) ) )
(tty-cooked)
(if result (coerce linelist string) ) )
)
;;; HISTORY
(defvar *HISTORY-MAX* 50)
(defvar *HISTORY*)
(defvar *history-index* 0)
(defvar *history-sequence* 0)
(defun new-history (n)
(setq *history* (make-array n))
(setq *history-max* n)
(setq *history-index* 0)
(setf (aref *history* 0) (list *history-sequence* nil)))
(defun add-history (h)
(incf *history-sequence*)
(incf *history-index*)
(when (>= *history-index* *history-max*)
(setf *history-index* (1- *history-max*))
(replace *History* *history* :start1 0 :start2 1))
(setf (aref *history* *history-index*) (list *history-sequence* h))
(if (and (boundp 'x::*eustop-window*)
(find-method x::*eustop-window* :update-history))
(send x::*eustop-window* :update-history))
*history*)
(defun print-history (&optional (strm *terminal-io*) &aux h)
(dotimes (i (1+ *history-index*))
(setq h (elt *history* i))
(if (consp h)
(format strm "~2d: ~A~%" (car h) (cadr h))) )
)
(defun h () "print-history" (print-history))
(defun get-history (n)
(if (numberp n)
(if (<= n 0)
(cadr (elt *history* (+ *history-index* n -1)) )
(cadr (elt *history* (min *history-index*
(max 0 (- n (car (aref *history* 1)) -1))))) )
(do ((i (1- *history-index*) (1- i))
(pattern (string n))
(his))
((<= i 0) nil)
(if (substringp pattern (string (setq his (cadr (aref *history* i)))))
(return-from get-history his)))))
(defun ! (&optional (n 0))
(let* ((history-string (get-history n))
(edited-string (line-edit history-string)))
(terpri)
(cond (edited-string
(add-history edited-string)
(evaluate-stream (make-string-input-stream edited-string)) )
(t nil))))
;(defun toplevel-prompt (strm)
; (format strm "~d.~a " (1+ *history-sequence*) *prompt-string*))
(provide :history "@(#)$Id$")
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