lisp/calc/calc-yank.el

   1 ;;; calc-yank.el --- kill-ring functionality for Calc
   2
   3 ;; Copyright (C) 1990-1993, 2001-2015 Free Software Foundation, Inc.
   4
   5 ;; Author: David Gillespie <daveg@synaptics.com>
   6 ;; Maintainer: Jay Belanger <jay.p.belanger@gmail.com>
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;;; Code:
  26
  27 ;; This file is autoloaded from calc-ext.el.
  28
  29 (require 'calc-ext)
  30 (require 'calc-macs)
  31
  32 ;;; Kill ring commands.
  33
  34 (defun calc-kill (nn &optional no-delete)
  35   (interactive "P")
  36   (if (eq major-mode 'calc-mode)
  37       (calc-wrapper
  38        (calc-force-refresh)
  39        (calc-set-command-flag 'no-align)
  40        (let ((num (max (calc-locate-cursor-element (point)) 1))
  41              (n (prefix-numeric-value nn)))
  42          (if (< n 0)
  43              (progn
  44                (if (eobp)
  45                    (setq num (1- num)))
  46                (setq num (- num n)
  47                      n (- n))))
  48          (calc-check-stack num)
  49          (let ((stuff (calc-top-list n (- num n -1))))
  50            (calc-cursor-stack-index num)
  51            (let ((first (point)))
  52              (calc-cursor-stack-index (- num n))
  53              (if (null nn)
  54                  (backward-char 1))   ; don't include newline for raw C-k
  55              (copy-region-as-kill first (point))
  56              (if (not no-delete)
  57                  (calc-pop-stack n (- num n -1))))
  58            (setq calc-last-kill (cons (car kill-ring) stuff)))))
  59     (kill-line nn)))
  60
  61 (defun calc-force-refresh ()
  62   (if (or calc-executing-macro calc-display-dirty)
  63       (let ((calc-executing-macro nil))
  64         (calc-refresh))))
  65
  66 (defun calc-locate-cursor-element (pt)
  67   (save-excursion
  68     (goto-char (point-max))
  69     (calc-locate-cursor-scan (- calc-stack-top) calc-stack pt)))
  70
  71 (defun calc-locate-cursor-scan (n stack pt)
  72   (if (or (<= (point) pt)
  73           (null stack))
  74       n
  75     (forward-line (- (nth 1 (car stack))))
  76     (calc-locate-cursor-scan (1+ n) (cdr stack) pt)))
  77
  78 (defun calc-kill-region (top bot &optional no-delete)
  79   (interactive "r")
  80   (if (eq major-mode 'calc-mode)
  81       (calc-wrapper
  82        (calc-force-refresh)
  83        (calc-set-command-flag 'no-align)
  84        (let* ((top-num (calc-locate-cursor-element top))
  85               (top-pos (save-excursion
  86                          (calc-cursor-stack-index top-num)
  87                          (point)))
  88               (bot-num (calc-locate-cursor-element (1- bot)))
  89               (bot-pos (save-excursion
  90                          (calc-cursor-stack-index (max 0 (1- bot-num)))
  91                          (point)))
  92               (num (- top-num bot-num -1)))
  93          (copy-region-as-kill top-pos bot-pos)
  94          (setq calc-last-kill (cons (car kill-ring)
  95                                     (calc-top-list num bot-num)))
  96          (if (not no-delete)
  97              (calc-pop-stack num bot-num))))
  98     (if no-delete
  99         (copy-region-as-kill top bot)
 100       (kill-region top bot))))
 101
 102 (defun calc-copy-as-kill (n)
 103   (interactive "P")
 104   (calc-kill n t))
 105
 106 (defun calc-copy-region-as-kill (top bot)
 107   (interactive "r")
 108   (calc-kill-region top bot t))
 109
 110 ;; This function uses calc-last-kill if possible to get an exact result,
 111 ;; otherwise it just parses the yanked string.
 112 ;; Modified to use Emacs 19 extended concept of kill-ring. -- daveg 12/15/96
 113 ;;;###autoload
 114 (defun calc-yank ()
 115   (interactive)
 116   (calc-wrapper
 117    (calc-pop-push-record-list
 118     0 "yank"
 119     (let ((thing (if (fboundp 'current-kill)
 120                      (current-kill 0 t)
 121                    (car kill-ring-yank-pointer))))
 122       (if (eq (car-safe calc-last-kill) thing)
 123           (cdr calc-last-kill)
 124         (if (stringp thing)
 125             (let ((val (math-read-exprs (calc-clean-newlines thing))))
 126               (if (eq (car-safe val) 'error)
 127                   (progn
 128                     (setq val (math-read-exprs thing))
 129                     (if (eq (car-safe val) 'error)
 130                         (error "Bad format in yanked data")
 131                       val))
 132                 val))))))))
 133
 134 ;;; The Calc set- and get-register commands are modified versions of functions
 135 ;;; in register.el
 136
 137 (defvar calc-register-alist nil
 138   "Alist of elements (NAME . (TEXT . CALCVAL)).
 139 NAME is a character (a number).
 140 TEXT and CALCVAL are the TEXT and internal structure of stack entries.")
 141
 142 (defun calc-set-register (register text calcval)
 143   "Set the contents of the Calc register REGISTER to (TEXT . CALCVAL),
 144 as well as set the contents of the Emacs register REGISTER to TEXT."
 145   (set-register register text)
 146   (setf (alist-get register calc-register-alist) (cons text calcval)))
 147
 148 (defun calc-get-register (reg)
 149   "Return the CALCVAL portion of the contents of the Calc register REG,
 150 unless the TEXT portion doesn't match the contents of the Emacs register REG,
 151 in which case either return the contents of the Emacs register (if it is
 152 text) or `nil'."
 153   (let ((cval (cdr (assq reg calc-register-alist)))
 154         (val (cdr (assq reg register-alist))))
 155     (if (stringp val)
 156         (if (and (stringp (car cval))
 157                  (string= (car cval) val))
 158             (cdr cval)
 159           val))))
 160
 161 (defun calc-copy-to-register (register start end &optional delete-flag)
 162   "Copy the lines in the region into register REGISTER.
 163 With prefix arg, delete as well.
 164
 165 Interactively, reads the register using `register-read-with-preview'."
 166   (interactive (list (register-read-with-preview "Copy to register: ")
 167                      (region-beginning) (region-end)
 168                      current-prefix-arg))
 169   (if (eq major-mode 'calc-mode)
 170       (let* ((top-num (calc-locate-cursor-element start))
 171              (top-pos (save-excursion
 172                         (calc-cursor-stack-index top-num)
 173                         (point)))
 174              (bot-num (calc-locate-cursor-element (1- end)))
 175              (bot-pos (save-excursion
 176                         (calc-cursor-stack-index (max 0 (1- bot-num)))
 177                         (point)))
 178              (num (- top-num bot-num -1))
 179              (str (buffer-substring top-pos bot-pos)))
 180         (calc-set-register register str (calc-top-list num bot-num))
 181         (if delete-flag
 182             (calc-wrapper
 183              (calc-pop-stack num bot-num))))
 184     (copy-to-register register start end delete-flag)))
 185
 186 (defun calc-insert-register (register)
 187   "Insert the contents of register REGISTER.
 188
 189 Interactively, reads the register using `register-read-with-preview'."
 190   (interactive (list (register-read-with-preview "Insert register: ")))
 191   (if (eq major-mode 'calc-mode)
 192       (let ((val (calc-get-register register)))
 193         (calc-wrapper
 194          (calc-pop-push-record-list
 195           0 "insr"
 196           (if (not val)
 197               (error "Bad format in register data")
 198             (if (consp val)
 199                 val
 200               (let ((nval (math-read-exprs (calc-clean-newlines val))))
 201                 (if (eq (car-safe nval) 'error)
 202                     (progn
 203                       (setq nval (math-read-exprs val))
 204                       (if (eq (car-safe nval) 'error)
 205                           (error "Bad format in register data")
 206                         nval))
 207                   nval)))))))
 208     (insert-register register)))
 209
 210 (defun calc-add-to-register (register start end prepend delete-flag)
 211   "Add the lines in the region to register REGISTER.
 212 If PREPEND is non-nil, add them to the beginning of the register,
 213 otherwise the end.  If DELETE-FLAG is non-nil, also delete the region."
 214   (let* ((top-num (calc-locate-cursor-element start))
 215          (top-pos (save-excursion
 216                     (calc-cursor-stack-index top-num)
 217                     (point)))
 218          (bot-num (calc-locate-cursor-element (1- end)))
 219          (bot-pos (save-excursion
 220                     (calc-cursor-stack-index (max 0 (1- bot-num)))
 221                     (point)))
 222          (num (- top-num bot-num -1))
 223          (str (buffer-substring top-pos bot-pos))
 224          (calcval (calc-top-list num bot-num))
 225          (cval (cdr (assq register calc-register-alist))))
 226     (if (not cval)
 227         (calc-set-register register str calcval)
 228       (if prepend
 229           (calc-set-register
 230            register
 231            (concat str (car cval))
 232            (append calcval (cdr cval)))
 233         (calc-set-register
 234          register
 235          (concat (car cval) str)
 236          (append (cdr cval) calcval))))
 237     (if delete-flag
 238         (calc-wrapper
 239          (calc-pop-stack num bot-num)))))
 240
 241 (defun calc-append-to-register (register start end &optional delete-flag)
 242   "Copy the lines in the region to the end of register REGISTER.
 243 With prefix arg, also delete the region.
 244
 245 Interactively, reads the register using `register-read-with-preview'."
 246   (interactive (list (register-read-with-preview "Append to register: ")
 247                      (region-beginning) (region-end)
 248                      current-prefix-arg))
 249   (if (eq major-mode 'calc-mode)
 250       (calc-add-to-register register start end nil delete-flag)
 251     (append-to-register register start end delete-flag)))
 252
 253 (defun calc-prepend-to-register (register start end &optional delete-flag)
 254   "Copy the lines in the region to the beginning of register REGISTER.
 255 With prefix arg, also delete the region.
 256
 257 Interactively, reads the register using `register-read-with-preview'."
 258   (interactive (list (register-read-with-preview "Prepend to register: ")
 259                      (region-beginning) (region-end)
 260                      current-prefix-arg))
 261   (if (eq major-mode 'calc-mode)
 262       (calc-add-to-register register start end t delete-flag)
 263     (prepend-to-register register start end delete-flag)))
 264
 265
 266
 267 (defun calc-clean-newlines (s)
 268   (cond
 269
 270    ;; Omit leading/trailing whitespace
 271    ((or (string-match "\\`[ \n\r]+\\([^\001]*\\)\\'" s)
 272         (string-match "\\`\\([^\001]*\\)[ \n\r]+\\'" s))
 273     (calc-clean-newlines (math-match-substring s 1)))
 274
 275    ;; Convert newlines to commas
 276    ((string-match "\\`\\(.*\\)[\n\r]+\\([^\001]*\\)\\'" s)
 277     (calc-clean-newlines (concat (math-match-substring s 1) ","
 278                                  (math-match-substring s 2))))
 279
 280    (t s)))
 281
 282
 283 (defun calc-do-grab-region (top bot arg)
 284   (when (memq major-mode '(calc-mode calc-trail-mode))
 285     (error "This command works only in a regular text buffer"))
 286   (let* ((from-buffer (current-buffer))
 287          (calc-was-started (get-buffer-window "*Calculator*"))
 288          (single nil)
 289          data vals pos)
 290     (if arg
 291         (if (consp arg)
 292             (setq single t)
 293           (setq arg (prefix-numeric-value arg))
 294           (if (= arg 0)
 295               (setq top (point-at-bol)
 296                     bot (point-at-eol))
 297             (save-excursion
 298               (setq top (point))
 299               (forward-line arg)
 300               (if (> arg 0)
 301                   (setq bot (point))
 302                 (setq bot top
 303                       top (point)))))))
 304     (setq data (buffer-substring top bot))
 305     (calc)
 306     (if single
 307         (setq vals (math-read-expr data))
 308       (setq vals (math-read-expr (concat "[" data "]")))
 309       (and (eq (car-safe vals) 'vec)
 310            (= (length vals) 2)
 311            (eq (car-safe (nth 1 vals)) 'vec)
 312            (setq vals (nth 1 vals))))
 313     (if (eq (car-safe vals) 'error)
 314         (progn
 315           (if calc-was-started
 316               (pop-to-buffer from-buffer)
 317             (calc-quit t)
 318             (switch-to-buffer from-buffer))
 319           (goto-char top)
 320           (forward-char (+ (nth 1 vals) (if single 0 1)))
 321           (error (nth 2 vals))))
 322     (calc-slow-wrapper
 323      (calc-enter-result 0 "grab" vals))))
 324
 325
 326 (defun calc-do-grab-rectangle (top bot arg &optional reduce)
 327   (and (memq major-mode '(calc-mode calc-trail-mode))
 328        (error "This command works only in a regular text buffer"))
 329   (let* ((col1 (save-excursion (goto-char top) (current-column)))
 330          (col2 (save-excursion (goto-char bot) (current-column)))
 331          (from-buffer (current-buffer))
 332          (calc-was-started (get-buffer-window "*Calculator*"))
 333          data mat vals lnum pt pos)
 334     (if (= col1 col2)
 335         (save-excursion
 336           (unless (= col1 0)
 337             (error "Point and mark must be at beginning of line, or define a rectangle"))
 338           (goto-char top)
 339           (while (< (point) bot)
 340             (setq pt (point))
 341             (forward-line 1)
 342             (setq data (cons (buffer-substring pt (1- (point))) data)))
 343           (setq data (nreverse data)))
 344       (setq data (extract-rectangle top bot)))
 345     (calc)
 346     (setq mat (list 'vec)
 347           lnum 0)
 348     (when arg
 349       (setq arg (if (consp arg) 0 (prefix-numeric-value arg))))
 350     (while data
 351       (if (natnump arg)
 352           (progn
 353             (if (= arg 0)
 354                 (setq arg 1000000))
 355             (setq pos 0
 356                   vals (list 'vec))
 357             (let ((w (length (car data)))
 358                   j v)
 359               (while (< pos w)
 360                 (setq j (+ pos arg)
 361                       v (if (>= j w)
 362                             (math-read-expr (substring (car data) pos))
 363                           (math-read-expr (substring (car data) pos j))))
 364                 (if (eq (car-safe v) 'error)
 365                     (setq vals v w 0)
 366                   (setq vals (nconc vals (list v))
 367                         pos j)))))
 368         (if (string-match "\\` *-?[0-9][0-9]?[0-9]?[0-9]?[0-9]?[0-9]? *\\'"
 369                           (car data))
 370             (setq vals (list 'vec (string-to-number (car data))))
 371           (if (and (null arg)
 372                    (string-match "[[{][^][{}]*[]}]" (car data)))
 373               (setq pos (match-beginning 0)
 374                     vals (math-read-expr (math-match-substring (car data) 0)))
 375             (let ((s (if (string-match
 376                           "\\`\\([0-9]+:[ \t]\\)?\\(.*[^, \t]\\)[, \t]*\\'"
 377                           (car data))
 378                          (math-match-substring (car data) 2)
 379                        (car data))))
 380               (setq pos -1
 381                     vals (math-read-expr (concat "[" s "]")))
 382               (if (eq (car-safe vals) 'error)
 383                   (let ((v2 (math-read-expr s)))
 384                     (unless (eq (car-safe v2) 'error)
 385                       (setq vals (list 'vec v2)))))))))
 386       (if (eq (car-safe vals) 'error)
 387           (progn
 388             (if calc-was-started
 389                 (pop-to-buffer from-buffer)
 390               (calc-quit t)
 391               (switch-to-buffer from-buffer))
 392             (goto-char top)
 393             (forward-line lnum)
 394             (forward-char (+ (nth 1 vals) (min col1 col2) pos))
 395             (error (nth 2 vals))))
 396       (unless (equal vals '(vec))
 397         (setq mat (cons vals mat)))
 398       (setq data (cdr data)
 399             lnum (1+ lnum)))
 400     (calc-slow-wrapper
 401      (if reduce
 402          (calc-enter-result 0 "grb+" (list reduce '(var add var-add)
 403                                            (nreverse mat)))
 404        (calc-enter-result 0 "grab" (nreverse mat))))))
 405
 406
 407 (defun calc-copy-to-buffer (nn)
 408   "Copy the top of stack into an editing buffer."
 409   (interactive "P")
 410   (let ((thebuf (and (not (memq major-mode '(calc-mode calc-trail-mode)))
 411                      (current-buffer)))
 412         (movept nil)
 413         oldbuf newbuf)
 414     (calc-wrapper
 415      (save-excursion
 416        (calc-force-refresh)
 417        (let ((n (prefix-numeric-value nn))
 418              (eat-lnums calc-line-numbering)
 419              (big-offset (if (eq calc-language 'big) 1 0))
 420              top bot)
 421          (setq oldbuf (current-buffer)
 422                newbuf (or thebuf
 423                           (calc-find-writable-buffer (buffer-list) 0)
 424                           (calc-find-writable-buffer (buffer-list) 1)
 425                           (error "No other buffer")))
 426          (cond ((and (or (null nn)
 427                          (consp nn))
 428                      (= (calc-substack-height 0)
 429                         (- (1- (calc-substack-height 1)) big-offset)))
 430                 (calc-cursor-stack-index 1)
 431                 (if (looking-at
 432                      (if calc-line-numbering "[0-9]+: *[^ \n]" " *[^ \n]"))
 433                     (goto-char (1- (match-end 0))))
 434                 (setq eat-lnums nil
 435                       top (point))
 436                 (calc-cursor-stack-index 0)
 437                 (setq bot (- (1- (point)) big-offset)))
 438                ((> n 0)
 439                 (calc-cursor-stack-index n)
 440                 (setq top (point))
 441                 (calc-cursor-stack-index 0)
 442                 (setq bot (- (point) big-offset)))
 443                ((< n 0)
 444                 (calc-cursor-stack-index (- n))
 445                 (setq top (point))
 446                 (calc-cursor-stack-index (1- (- n)))
 447                 (setq bot (point)))
 448                (t
 449                 (goto-char (point-min))
 450                 (forward-line 1)
 451                 (setq top (point))
 452                 (calc-cursor-stack-index 0)
 453                 (setq bot (point))))
 454          (with-current-buffer newbuf
 455            (if (consp nn)
 456                (kill-region (region-beginning) (region-end)))
 457            (push-mark (point) t)
 458            (if (and overwrite-mode (not (consp nn)))
 459                (calc-overwrite-string (with-current-buffer oldbuf
 460                                         (buffer-substring top bot))
 461                                       eat-lnums)
 462              (or (bolp) (setq eat-lnums nil))
 463              (insert-buffer-substring oldbuf top bot)
 464              (and eat-lnums
 465                   (let ((n 1))
 466                     (while (and (> (point) (mark))
 467                                 (progn
 468                                   (forward-line -1)
 469                                   (>= (point) (mark))))
 470                       (delete-char 4)
 471                       (setq n (1+ n)))
 472                     (forward-line n))))
 473            (when thebuf
 474              (setq movept (point)))
 475            (when (get-buffer-window (current-buffer))
 476              (set-window-point (get-buffer-window (current-buffer))
 477                                (point)))))))
 478     (when movept
 479       (goto-char movept))
 480     (when (and (consp nn)
 481                (not thebuf))
 482       (calc-quit t)
 483       (switch-to-buffer newbuf))))
 484
 485 (defun calc-overwrite-string (str eat-lnums)
 486   (when (string-match "\n\\'" str)
 487     (setq str (substring str 0 -1)))
 488   (when eat-lnums
 489     (setq str (substring str 4)))
 490   (if (and (string-match "\\`[-+]?[0-9.]+\\(e-?[0-9]+\\)?\\'" str)
 491            (looking-at "[-+]?[0-9.]+\\(e-?[0-9]+\\)?"))
 492       (progn
 493         (delete-region (point) (match-end 0))
 494         (insert str))
 495     (let ((i 0))
 496       (while (< i (length str))
 497         (if (= (setq last-command-event (aref str i)) ?\n)
 498             (or (= i (1- (length str)))
 499                 (let ((pt (point)))
 500                   (end-of-line)
 501                   (delete-region pt (point))
 502                   (if (eobp)
 503                       (insert "\n")
 504                     (forward-char 1))
 505                   (if eat-lnums (setq i (+ i 4)))))
 506           (self-insert-command 1))
 507         (setq i (1+ i))))))
 508
 509 ;; First, require that buffer is visible and does not begin with "*"
 510 ;; Second, require only that it not begin with "*Calc"
 511 (defun calc-find-writable-buffer (buf mode)
 512   (and buf
 513        (if (or (string-match "\\`\\( .*\\|\\*Calc.*\\)"
 514                              (buffer-name (car buf)))
 515                (and (= mode 0)
 516                     (or (string-match "\\`\\*.*" (buffer-name (car buf)))
 517                         (not (get-buffer-window (car buf))))))
 518            (calc-find-writable-buffer (cdr buf) mode)
 519          (car buf))))
 520
 521
 522 (defun calc-edit (n)
 523   (interactive "p")
 524   (calc-slow-wrapper
 525    (when (eq n 0)
 526      (setq n (calc-stack-size)))
 527    (let* ((flag nil)
 528           (allow-ret (> n 1))
 529           (list (math-showing-full-precision
 530                  (mapcar (if (> n 1)
 531                              (function (lambda (x)
 532                                          (math-format-flat-expr x 0)))
 533                            (function
 534                             (lambda (x)
 535                               (if (math-vectorp x) (setq allow-ret t))
 536                               (math-format-nice-expr x (frame-width)))))
 537                          (if (> n 0)
 538                              (calc-top-list n)
 539                            (calc-top-list 1 (- n)))))))
 540      (calc-edit-mode (list 'calc-finish-stack-edit (or flag n)) allow-ret)
 541      (while list
 542        (insert (car list) "\n")
 543        (setq list (cdr list)))))
 544   (calc-show-edit-buffer))
 545
 546 (defun calc-alg-edit (str)
 547   (calc-edit-mode '(calc-finish-stack-edit 0))
 548   (calc-show-edit-buffer)
 549   (insert str "\n")
 550   (backward-char 1)
 551   (calc-set-command-flag 'do-edit))
 552
 553 (defvar calc-edit-mode-map
 554   (let ((map (make-sparse-keymap)))
 555     (define-key map "\n" 'calc-edit-finish)
 556     (define-key map "\r" 'calc-edit-return)
 557     (define-key map "\C-c\C-c" 'calc-edit-finish)
 558     map)
 559   "Keymap for use by the calc-edit command.")
 560
 561 (defvar calc-original-buffer)
 562 (defvar calc-return-buffer)
 563 (defvar calc-one-window)
 564 (defvar calc-edit-handler)
 565 (defvar calc-restore-trail)
 566 (defvar calc-allow-ret)
 567 (defvar calc-edit-top)
 568
 569 (defun calc-edit-mode (&optional handler allow-ret title)
 570   "Calculator editing mode.  Press RET, LFD, or C-c C-c to finish.
 571 To cancel the edit, simply kill the *Calc Edit* buffer."
 572   (interactive)
 573   (unless handler
 574     (error "This command can be used only indirectly through calc-edit"))
 575   (let ((oldbuf (current-buffer))
 576         (buf (get-buffer-create "*Calc Edit*")))
 577     (set-buffer buf)
 578     (kill-all-local-variables)
 579     (use-local-map calc-edit-mode-map)
 580     (setq buffer-read-only nil)
 581     (setq truncate-lines nil)
 582     (setq major-mode 'calc-edit-mode)
 583     (setq mode-name "Calc Edit")
 584     (run-mode-hooks 'calc-edit-mode-hook)
 585     (make-local-variable 'calc-original-buffer)
 586     (setq calc-original-buffer oldbuf)
 587     (make-local-variable 'calc-return-buffer)
 588     (setq calc-return-buffer oldbuf)
 589     (make-local-variable 'calc-one-window)
 590     (setq calc-one-window (and (one-window-p t) pop-up-windows))
 591     (make-local-variable 'calc-edit-handler)
 592     (setq calc-edit-handler handler)
 593     (make-local-variable 'calc-restore-trail)
 594     (setq calc-restore-trail (get-buffer-window (calc-trail-buffer)))
 595     (make-local-variable 'calc-allow-ret)
 596     (setq calc-allow-ret allow-ret)
 597     (let ((inhibit-read-only t))
 598       (erase-buffer))
 599     (add-hook 'kill-buffer-hook (lambda ()
 600                                   (let ((calc-edit-handler nil))
 601                                     (calc-edit-finish t))
 602                                   (message "(Canceled)")) t t)
 603     (insert (propertize
 604              (concat
 605               (or title title "Calc Edit Mode. ")
 606               "Press `C-c C-c'"
 607               (if allow-ret "" " or RET")
 608               " to finish, `C-x k RET' to cancel.\n\n")
 609              'font-lock-face 'italic 'read-only t 'rear-nonsticky t 'front-sticky t))
 610     (make-local-variable 'calc-edit-top)
 611     (setq calc-edit-top (point))))
 612 (put 'calc-edit-mode 'mode-class 'special)
 613
 614 (defun calc-show-edit-buffer ()
 615   (let ((buf (current-buffer)))
 616     (if (and (one-window-p t) pop-up-windows)
 617         (pop-to-buffer (get-buffer-create "*Calc Edit*"))
 618       (and calc-embedded-info (get-buffer-window (aref calc-embedded-info 1))
 619            (select-window (get-buffer-window (aref calc-embedded-info 1))))
 620       (switch-to-buffer (get-buffer-create "*Calc Edit*")))
 621     (setq calc-return-buffer buf)
 622     (if (and (< (window-width) (frame-width))
 623              calc-display-trail)
 624         (let ((win (get-buffer-window (calc-trail-buffer))))
 625           (if win
 626               (delete-window win))))
 627     (set-buffer-modified-p nil)
 628     (goto-char calc-edit-top)))
 629
 630 (defun calc-edit-return ()
 631   (interactive)
 632   (if (and (boundp 'calc-allow-ret) calc-allow-ret)
 633       (newline)
 634     (calc-edit-finish)))
 635
 636 ;; The variable calc-edit-disp-trail is local to calc-edit finish, but
 637 ;; is used by calc-finish-selection-edit and calc-finish-stack-edit.
 638 (defvar calc-edit-disp-trail)
 639
 640 (defun calc-edit-finish (&optional keep)
 641   "Finish calc-edit mode.  Parse buffer contents and push them on the stack."
 642   (interactive "P")
 643   (message "Working...")
 644   (or (and (boundp 'calc-original-buffer)
 645            (boundp 'calc-return-buffer)
 646            (boundp 'calc-one-window)
 647            (boundp 'calc-edit-handler)
 648            (boundp 'calc-restore-trail)
 649            (eq major-mode 'calc-edit-mode))
 650       (error "This command is valid only in buffers created by calc-edit"))
 651   (let ((buf (current-buffer))
 652         (original calc-original-buffer)
 653         (return calc-return-buffer)
 654         (one-window calc-one-window)
 655         (calc-edit-disp-trail calc-restore-trail))
 656     (save-excursion
 657       (when (or (null (buffer-name original))
 658                 (progn
 659                   (set-buffer original)
 660                   (not (eq major-mode 'calc-mode))))
 661         (error "Original calculator buffer has been corrupted")))
 662     (goto-char calc-edit-top)
 663     (if (buffer-modified-p)
 664         (eval calc-edit-handler))
 665     (if (and one-window (not (one-window-p t)))
 666         (delete-window))
 667     (if (get-buffer-window return)
 668         (select-window (get-buffer-window return))
 669       (switch-to-buffer return))
 670     (if keep
 671         (bury-buffer buf)
 672       (kill-buffer buf))
 673     (if calc-edit-disp-trail
 674         (calc-wrapper
 675          (calc-trail-display 1 t)))
 676     (message "")))
 677
 678 (defun calc-edit-cancel ()
 679   "Cancel calc-edit mode.  Ignore the Calc Edit buffer and don't change stack."
 680   (interactive)
 681   (let ((calc-edit-handler nil))
 682     (calc-edit-finish))
 683   (message "(Canceled)"))
 684
 685 (defun calc-finish-stack-edit (num)
 686   (let ((buf (current-buffer))
 687         (str (buffer-substring calc-edit-top (point-max)))
 688         (start (point))
 689         pos)
 690     (if (and (integerp num) (> num 1))
 691         (while (setq pos (string-match "\n." str))
 692           (aset str pos ?\,)))
 693     (switch-to-buffer calc-original-buffer)
 694     (let ((vals (let ((calc-language nil)
 695                       (math-expr-opers (math-standard-ops)))
 696                   (and (string-match "[^\n\t ]" str)
 697                        (math-read-exprs str)))))
 698       (when (eq (car-safe vals) 'error)
 699         (switch-to-buffer buf)
 700         (goto-char (+ start (nth 1 vals)))
 701         (error (nth 2 vals)))
 702       (calc-wrapper
 703        (if (symbolp num)
 704            (progn
 705              (set num (car vals))
 706              (calc-refresh-evaltos num))
 707          (if calc-edit-disp-trail
 708              (calc-trail-display 1 t))
 709          (and vals
 710               (let ((calc-simplify-mode (if (eq last-command-event ?\C-j)
 711                                             'none
 712                                           calc-simplify-mode)))
 713                 (if (>= num 0)
 714                     (calc-enter-result num "edit" vals)
 715                   (calc-enter-result 1 "edit" vals (- num))))))))))
 716
 717 (provide 'calc-yank)
 718
 719 ;; Local variables:
 720 ;; generated-autoload-file: "calc-loaddefs.el"
 721 ;; End:
 722
 723 ;;; calc-yank.el ends here