code.delx.au - gnu-emacs/blob - lisp/emulation/viper-ex.el

   1 ;;; viper-ex.el --- functions implementing the Ex commands for Viper
   2
   3 ;; Copyright (C) 1994, 1995 Free Software Foundation, Inc.
   4
   5 ;; This file is part of GNU Emacs.
   6
   7 ;; GNU Emacs is free software; you can redistribute it and/or modify
   8 ;; it under the terms of the GNU General Public License as published by
   9 ;; the Free Software Foundation; either version 2, or (at your option)
  10 ;; any later version.
  11
  12 ;; GNU Emacs is distributed in the hope that it will be useful,
  13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;; GNU General Public License for more details.
  16
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  19 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20 ;; Boston, MA 02111-1307, USA.
  21
  22 (require 'viper-util)
  23
  24 ;;; Variables
  25
  26 (defconst vip-ex-work-buf-name " *ex-working-space*")
  27 (defconst vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
  28 (defconst vip-ex-tmp-buf-name " *ex-tmp*")
  29
  30
  31 ;;; Variable completion in :set command
  32
  33 ;; The list of Ex commands. Used for completing command names.
  34 (defconst ex-token-alist
  35   '(("!") ("=") (">") ("&") ("~")
  36     ("yank") ("xit") ("WWrite") ("Write") ("write") ("wq") ("visual")
  37     ("version") ("vglobal") ("unmap") ("undo") ("tag") ("transfer") ("suspend")
  38     ("substitute") ("submitReport") ("stop")  ("sr") ("source") ("shell")
  39     ("set") ("rewind") ("recover") ("read") ("quit") ("pwd")
  40     ("put") ("preserve") ("PreviousRelatedFile") ("RelatedFile")
  41     ("next") ("Next") ("move") ("mark") ("map") ("kmark") ("join")
  42     ("help") ("goto") ("global") ("file") ("edit") ("delete") ("copy")
  43     ("chdir") ("cd") ("Buffer") ("buffer") ("args"))  )
  44
  45 ;; A-list of Ex variables that can be set using the :set command.
  46 (defconst ex-variable-alist
  47   '(("wrapscan") ("ws") ("wrapmargin") ("wm")
  48     ("global-tabstop") ("gts") ("tabstop") ("ts")
  49     ("showmatch") ("sm") ("shiftwidth") ("sw") ("shell") ("sh")
  50     ("readonly") ("ro")
  51     ("nowrapscan") ("nows") ("noshowmatch") ("nosm")
  52     ("noreadonly") ("noro") ("nomagic") ("noma")
  53     ("noignorecase") ("noic")
  54     ("global-noautoindent") ("gnoai") ("noautoindent") ("noai")
  55     ("magic") ("ma") ("ignorecase") ("ic")
  56     ("global-autoindent") ("gai") ("autoindent") ("ai")
  57     ))
  58
  59
  60
  61 ;; Token recognized during parsing of Ex commands (e.g., "read", "comma")
  62 (defvar ex-token nil)
  63
  64 ;; Type of token.
  65 ;; If non-nil, gives type of address; if nil, it is a command.
  66 (defvar ex-token-type nil)
  67
  68 ;; List of addresses passed to Ex command
  69 (defvar ex-addresses nil)
  70
  71 ;; It seems that this flag is used only for `#', `print', and `list', which
  72 ;; aren't implemented. Check later.
  73 (defvar ex-flag nil)
  74
  75 ;; "buffer" where Ex commands keep deleted data.
  76 ;; In Emacs terms, this is a register.
  77 (defvar ex-buffer nil)
  78
  79 ;; Value of ex count.
  80 (defvar ex-count nil)
  81
  82 ;; Flag for global command.
  83 (defvar ex-g-flag nil)
  84
  85 ;; If t, global command is executed on lines not matching ex-g-pat.
  86 (defvar ex-g-variant nil)
  87
  88 ;; Save reg-exp used in substitute.
  89 (defvar ex-reg-exp nil)
  90
  91
  92 ;; Replace pattern for substitute.
  93 (defvar ex-repl nil)
  94
  95 ;; Pattern for global command.
  96 (defvar ex-g-pat nil)
  97
  98 ;; `sh' doesn't seem to expand wildcards, like `*'
  99 (defconst ex-find-file-shell "csh"
 100   "Shell in which to interpret wildcards. Must be csh, tcsh, or similar.
 101 Bourne shell doesn't seem to work here.")
 102 (defvar ex-find-file-shell-options "-f"
 103   "*Options to pass to `ex-find-file-shell'.")
 104
 105 ;; Remembers the previous Ex tag.
 106 (defvar ex-tag nil)
 107
 108 ;; file used by Ex commands like :r, :w, :n
 109 (defvar ex-file nil)
 110
 111 ;; If t, tells Ex that this is a variant-command, i.e., w>>, r!, etc.
 112 (defvar ex-variant nil)
 113
 114 ;; Specified the offset of an Ex command, such as :read.
 115 (defvar ex-offset nil)
 116
 117 ;; Tells Ex that this is a w>> command.
 118 (defvar ex-append nil)
 119
 120 ;; File containing the shell command to be executed at Ex prompt,
 121 ;; e.g., :r !date
 122 (defvar ex-cmdfile nil)
 123
 124 ;; flag used in vip-ex-read-file-name to indicate that we may be reading
 125 ;; multiple file names. Used for :edit and :next
 126 (defvar vip-keep-reading-filename nil)
 127
 128 (defconst ex-cycle-other-window t
 129   "*If t, :n and :b cycles through files and buffers in other window.
 130 Then :N and :B cycles in the current window. If nil, this behavior is
 131 reversed.")
 132
 133 (defconst ex-cycle-through-non-files nil
 134   "*Cycle through *scratch* and other buffers that don't visit any file.")
 135
 136 ;; Last shell command executed with :! command.
 137 (defvar vip-ex-last-shell-com nil)
 138
 139 ;; Indicates if Minibuffer was exited temporarily in Ex-command.
 140 (defvar vip-incomplete-ex-cmd nil)
 141
 142 ;; Remembers the last ex-command prompt.
 143 (defvar vip-last-ex-prompt "")
 144
 145
 146 ;;; Code
 147
 148 ;; Check if ex-token is an initial segment of STR
 149 (defun vip-check-sub (str)
 150   (let ((length (length ex-token)))
 151     (if (and (<= length (length str))
 152              (string= ex-token (substring str 0 length)))
 153         (setq ex-token str)
 154       (setq ex-token-type 'non-command))))
 155
 156 ;; Get a complete ex command
 157 (defun vip-get-ex-com-subr ()
 158   (let (case-fold-search)
 159     (set-mark (point))
 160     (re-search-forward "[a-zA-Z][a-zA-Z]*")
 161     (setq ex-token-type 'command)
 162     (setq ex-token (buffer-substring (point) (mark t)))
 163     (exchange-point-and-mark)
 164     (cond ((looking-at "a")
 165            (cond ((looking-at "ab") (vip-check-sub "abbreviate"))
 166                  ((looking-at "ar") (vip-check-sub "args"))
 167                  (t (vip-check-sub "append"))))
 168           ((looking-at "h") (vip-check-sub "help"))
 169           ((looking-at "c")
 170            (cond ((looking-at "cd") (vip-check-sub "cd"))
 171                  ((looking-at "ch") (vip-check-sub "chdir"))
 172                  ((looking-at "co") (vip-check-sub "copy"))
 173                  (t (vip-check-sub "change"))))
 174           ((looking-at "d") (vip-check-sub "delete"))
 175           ((looking-at "b") (vip-check-sub "buffer"))
 176           ((looking-at "B") (vip-check-sub "Buffer"))
 177           ((looking-at "e")
 178            (if (looking-at "ex") (vip-check-sub "ex")
 179              (vip-check-sub "edit")))
 180           ((looking-at "f") (vip-check-sub "file"))
 181           ((looking-at "g") (vip-check-sub "global"))
 182           ((looking-at "i") (vip-check-sub "insert"))
 183           ((looking-at "j") (vip-check-sub "join"))
 184           ((looking-at "l") (vip-check-sub "list"))
 185           ((looking-at "m")
 186            (cond ((looking-at "map") (vip-check-sub "map"))
 187                  ((looking-at "mar") (vip-check-sub "mark"))
 188                  (t (vip-check-sub "move"))))
 189           ((looking-at "k[a-z][^a-z]")
 190            (setq ex-token "kmark")
 191            (forward-char 1)
 192            (exchange-point-and-mark))   ; this is canceled out by another
 193                                         ; exchange-point-and-mark at the end
 194           ((looking-at "k") (vip-check-sub "kmark"))
 195           ((looking-at "n") (if (looking-at "nu")
 196                                 (vip-check-sub "number")
 197                               (vip-check-sub "next")))
 198           ((looking-at "N") (vip-check-sub "Next"))
 199           ((looking-at "o") (vip-check-sub "open"))
 200           ((looking-at "p")
 201            (cond ((looking-at "pre") (vip-check-sub "preserve"))
 202                  ((looking-at "pu") (vip-check-sub "put"))
 203                  ((looking-at "pw") (vip-check-sub "pwd"))
 204                  (t (vip-check-sub "print"))))
 205           ((looking-at "P") (vip-check-sub "PreviousRelatedFile"))
 206           ((looking-at "R") (vip-check-sub "RelatedFile"))
 207           ((looking-at "q") (vip-check-sub "quit"))
 208           ((looking-at "r")
 209            (cond ((looking-at "rec") (vip-check-sub "recover"))
 210                  ((looking-at "rew") (vip-check-sub "rewind"))
 211                  (t (vip-check-sub "read"))))
 212           ((looking-at "s")
 213            (cond ((looking-at "se") (vip-check-sub "set"))
 214                  ((looking-at "sh") (vip-check-sub "shell"))
 215                  ((looking-at "so") (vip-check-sub "source"))
 216                  ((looking-at "sr") (vip-check-sub "sr"))
 217                  ((looking-at "st") (vip-check-sub "stop"))
 218                  ((looking-at "sus") (vip-check-sub "suspend"))
 219                  ((looking-at "subm") (vip-check-sub "submitReport"))
 220                  (t (vip-check-sub "substitute"))))
 221           ((looking-at "t")
 222            (if (looking-at "ta") (vip-check-sub "tag")
 223              (vip-check-sub "transfer")))
 224           ((looking-at "u")
 225            (cond ((looking-at "una") (vip-check-sub "unabbreviate"))
 226                  ((looking-at "unm") (vip-check-sub "unmap"))
 227                  (t (vip-check-sub "undo"))))
 228           ((looking-at "v")
 229            (cond ((looking-at "ve") (vip-check-sub "version"))
 230                  ((looking-at "vi") (vip-check-sub "visual"))
 231                  (t (vip-check-sub "vglobal"))))
 232           ((looking-at "w")
 233            (if (looking-at "wq") (vip-check-sub "wq")
 234              (vip-check-sub "write")))
 235           ((looking-at "W")
 236            (if (looking-at "WW")
 237                (vip-check-sub "WWrite")
 238              (vip-check-sub "Write")))
 239           ((looking-at "x") (vip-check-sub "xit"))
 240           ((looking-at "y") (vip-check-sub "yank"))
 241           ((looking-at "z") (vip-check-sub "z")))
 242     (exchange-point-and-mark)
 243     ))
 244
 245 ;; Get an ex-token which is either an address or a command.
 246 ;; A token has a type, \(command, address, end-mark\), and a value
 247 (defun vip-get-ex-token ()
 248   (save-window-excursion
 249     (set-buffer vip-ex-work-buf)
 250     (skip-chars-forward " \t|")
 251     (cond ((looking-at "#")
 252            (setq ex-token-type 'command)
 253            (setq ex-token (char-to-string (following-char)))
 254            (forward-char 1))
 255           ((looking-at "[a-z]") (vip-get-ex-com-subr))
 256           ((looking-at "\\.")
 257            (forward-char 1)
 258            (setq ex-token-type 'dot))
 259           ((looking-at "[0-9]")
 260            (set-mark (point))
 261            (re-search-forward "[0-9]*")
 262            (setq ex-token-type
 263                  (cond ((eq ex-token-type 'plus) 'add-number)
 264                        ((eq ex-token-type 'minus) 'sub-number)
 265                        (t 'abs-number)))
 266            (setq ex-token (string-to-int (buffer-substring (point) (mark t)))))
 267           ((looking-at "\\$")
 268            (forward-char 1)
 269            (setq ex-token-type 'end))
 270           ((looking-at "%")
 271            (forward-char 1)
 272            (setq ex-token-type 'whole))
 273           ((looking-at "+")
 274            (cond ((or (looking-at "+[-+]") (looking-at "+[\n|]"))
 275                   (forward-char 1)
 276                   (insert "1")
 277                   (backward-char 1)
 278                   (setq ex-token-type 'plus))
 279                  ((looking-at "+[0-9]")
 280                   (forward-char 1)
 281                   (setq ex-token-type 'plus))
 282                  (t
 283                   (error vip-BadAddress))))
 284           ((looking-at "-")
 285            (cond ((or (looking-at "-[-+]") (looking-at "-[\n|]"))
 286                   (forward-char 1)
 287                   (insert "1")
 288                   (backward-char 1)
 289                   (setq ex-token-type 'minus))
 290                  ((looking-at "-[0-9]")
 291                   (forward-char 1)
 292                   (setq ex-token-type 'minus))
 293                  (t
 294                   (error vip-BadAddress))))
 295           ((looking-at "/")
 296            (forward-char 1)
 297            (set-mark (point))
 298            (let ((cont t))
 299              (while (and (not (eolp)) cont)
 300                ;;(re-search-forward "[^/]*/")
 301                (re-search-forward "[^/]*\\(/\\|\n\\)")
 302                (if (not (vip-looking-back "[^\\\\]\\(\\\\\\\\\\)*\\\\/"))
 303                    (setq cont nil))))
 304            (backward-char 1)
 305            (setq ex-token (buffer-substring (point) (mark t)))
 306            (if (looking-at "/") (forward-char 1))
 307            (setq ex-token-type 'search-forward))
 308           ((looking-at "\\?")
 309            (forward-char 1)
 310            (set-mark (point))
 311            (let ((cont t))
 312              (while (and (not (eolp)) cont)
 313                ;;(re-search-forward "[^\\?]*\\?")
 314                (re-search-forward "[^\\?]*\\(\\?\\|\n\\)")
 315                (if (not (vip-looking-back "[^\\\\]\\(\\\\\\\\\\)*\\\\\\?"))
 316                    (setq cont nil))
 317                (backward-char 1)
 318                (if (not (looking-at "\n")) (forward-char 1))))
 319            (setq ex-token-type 'search-backward)
 320            (setq ex-token (buffer-substring (1- (point)) (mark t))))
 321           ((looking-at ",")
 322            (forward-char 1)
 323            (setq ex-token-type 'comma))
 324           ((looking-at ";")
 325            (forward-char 1)
 326            (setq ex-token-type 'semi-colon))
 327           ((looking-at "[!=><&~]")
 328            (setq ex-token-type 'command)
 329            (setq ex-token (char-to-string (following-char)))
 330            (forward-char 1))
 331           ((looking-at "'")
 332            (setq ex-token-type 'goto-mark)
 333            (forward-char 1)
 334            (cond ((looking-at "'") (setq ex-token nil))
 335                  ((looking-at "[a-z]") (setq ex-token (following-char)))
 336                  (t (error "Marks are ' and a-z")))
 337            (forward-char 1))
 338           ((looking-at "\n")
 339            (setq ex-token-type 'end-mark)
 340            (setq ex-token "goto"))
 341           (t
 342            (error vip-BadExCommand)))))
 343
 344 ;; Reads Ex command. Tries to determine if it has to exit because command
 345 ;; is complete or invalid. If not, keeps reading command.
 346 (defun ex-cmd-read-exit ()
 347   (interactive)
 348   (setq vip-incomplete-ex-cmd t)
 349   (let ((quit-regex1 (concat
 350                       "\\(" "set[ \t]*"
 351                       "\\|" "edit[ \t]*"
 352                       "\\|" "[nN]ext[ \t]*"
 353                       "\\|" "unm[ \t]*"
 354                       "\\|" "^[ \t]*rep"
 355                       "\\)"))
 356         (quit-regex2 (concat
 357                       "[a-zA-Z][ \t]*"
 358                       "\\(" "!" "\\|" ">>"
 359                       "\\|" "\\+[0-9]+"
 360                       "\\)"
 361                       "*[ \t]*$"))
 362         (stay-regex (concat
 363                      "\\(" "^[ \t]*$"
 364                      "\\|" "[?/].*[?/].*"
 365                      "\\|" "[ktgjmsz][ \t]*$"
 366                      "\\|" "^[ \t]*ab.*"
 367                      "\\|" "tr[ansfer \t]*"
 368                      "\\|" "sr[ \t]*"
 369                      "\\|" "mo.*"
 370                      "\\|" "^[ \t]*k?ma[^p]*"
 371                      "\\|" "^[ \t]*fi.*"
 372                      "\\|" "v?gl.*"
 373                      "\\|" "[vg][ \t]*$"
 374                      "\\|" "jo.*"
 375                      "\\|" "^[ \t]*ta.*"
 376                      "\\|" "^[ \t]*una.*"
 377                      "\\|" "^[ \t]*su.*"
 378                      "\\|['`][a-z][ \t]*"
 379                      "\\|" "![ \t]*[a-zA-Z].*"
 380                      "\\)"
 381                      "!*")))
 382
 383     (save-window-excursion ;; put cursor at the end of the Ex working buffer
 384       (set-buffer vip-ex-work-buf)
 385       (goto-char (point-max)))
 386     (cond ((vip-looking-back quit-regex1) (exit-minibuffer))
 387           ((vip-looking-back stay-regex)  (insert " "))
 388           ((vip-looking-back quit-regex2) (exit-minibuffer))
 389           (t (insert " ")))))
 390
 391 ;; complete Ex command
 392 (defun ex-cmd-complete ()
 393   (interactive)
 394   (let (save-pos dist compl-list string-to-complete completion-result)
 395
 396     (save-excursion
 397       (setq dist (skip-chars-backward "[a-zA-Z!=>&~]")
 398             save-pos (point)))
 399
 400     (if (or (= dist 0)
 401             (vip-looking-back "\\([ \t]*['`][ \t]*[a-z]*\\)")
 402             (vip-looking-back
 403              "^[ \t]*[a-zA-Z!=>&~][ \t]*[/?]*+[ \t]+[a-zA-Z!=>&~]+"))
 404         ;; Preceding characters are not the ones allowed in an Ex command
 405         ;; or we have typed past command name.
 406         ;; Note: we didn't do parsing, so there may be surprises.
 407         (if (or (vip-looking-back "[a-zA-Z!=>&~][ \t]*[/?]*[ \t]*")
 408                 (vip-looking-back "\\([ \t]*['`][ \t]*[a-z]*\\)")
 409                 (looking-at "[^ \t\n\C-m]"))
 410             nil
 411           (with-output-to-temp-buffer "*Completions*"
 412             (display-completion-list
 413              (vip-alist-to-list ex-token-alist))))
 414       ;; Preceding chars may be part of a command name
 415       (setq string-to-complete (buffer-substring save-pos (point)))
 416       (setq completion-result
 417             (try-completion string-to-complete ex-token-alist))
 418
 419       (cond ((eq completion-result t)  ; exact match--do nothing
 420              (vip-tmp-insert-at-eob " (Sole completion)"))
 421             ((eq completion-result nil)
 422              (vip-tmp-insert-at-eob " (No match)"))
 423             (t  ;; partial completion
 424              (goto-char save-pos)
 425              (delete-region (point) (point-max))
 426              (insert completion-result)
 427              (let (case-fold-search)
 428                (setq compl-list
 429                      (vip-filter-alist (concat "^" completion-result)
 430                                        ex-token-alist)))
 431              (if (> (length compl-list) 1)
 432                  (with-output-to-temp-buffer "*Completions*"
 433                    (display-completion-list
 434                     (vip-alist-to-list (reverse compl-list)))))))
 435       )))
 436
 437
 438 ;; Read Ex commands
 439 ;; Ex commands themselves are implemented in viper-ex.el
 440 (defun vip-ex (&optional string)
 441   (interactive)
 442   (or string
 443       (setq ex-g-flag nil
 444             ex-g-variant nil))
 445   (let* ((map (copy-keymap minibuffer-local-map))
 446          (address nil)
 447          (cont t)
 448          (dot (point))
 449          prev-token-type com-str)
 450
 451     (vip-add-keymap vip-ex-cmd-map map)
 452
 453     (setq com-str (or string (vip-read-string-with-history
 454                               ":"
 455                               nil
 456                               'vip-ex-history
 457                               (car vip-ex-history)
 458                               map)))
 459     (save-window-excursion
 460       ;; just a precaution
 461       (or (vip-buffer-live-p vip-ex-work-buf)
 462           (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name)))
 463       (set-buffer vip-ex-work-buf)
 464       (delete-region (point-min) (point-max))
 465       (insert com-str "\n")
 466       (goto-char (point-min)))
 467     (setq ex-token-type nil
 468           ex-addresses nil)
 469     (while cont
 470       (vip-get-ex-token)
 471       (cond ((memq ex-token-type '(command end-mark))
 472              (if address (setq ex-addresses (cons address ex-addresses)))
 473              (cond ((string= ex-token "global")
 474                     (ex-global nil)
 475                     (setq cont nil))
 476                    ((string= ex-token "vglobal")
 477                     (ex-global t)
 478                     (setq cont nil))
 479                    (t
 480                     (vip-execute-ex-command)
 481                     (save-window-excursion
 482                       (set-buffer vip-ex-work-buf)
 483                       (skip-chars-forward " \t")
 484                       (cond ((looking-at "|")
 485                              (forward-char 1))
 486                             ((looking-at "\n")
 487                              (setq cont nil))
 488                             (t (error "`%s': %s" ex-token vip-SpuriousText)))
 489                       ))
 490                    ))
 491             ((eq ex-token-type 'non-command)
 492              (error (format "`%s': %s" ex-token vip-BadExCommand)))
 493             ((eq ex-token-type 'whole)
 494              (setq address nil)
 495              (setq ex-addresses
 496                    (if ex-addresses
 497                        (cons (point-max) ex-addresses)
 498                      (cons (point-max) (cons (point-min) ex-addresses)))))
 499             ((eq ex-token-type 'comma)
 500              (if (eq prev-token-type 'whole)
 501                  (setq address (point-min)))
 502              (setq ex-addresses
 503                    (cons (if (null address) (point) address) ex-addresses)))
 504             ((eq ex-token-type 'semi-colon)
 505              (if (eq prev-token-type 'whole)
 506                  (setq address (point-min)))
 507              (if address (setq dot address))
 508              (setq ex-addresses
 509                    (cons (if (null address) (point) address) ex-addresses)))
 510             (t (let ((ans (vip-get-ex-address-subr address dot)))
 511                  (if ans (setq address ans)))))
 512       (setq prev-token-type ex-token-type))))
 513
 514
 515 ;; Get a regular expression and set `ex-variant', if found
 516 (defun vip-get-ex-pat ()
 517   (save-window-excursion
 518     (set-buffer vip-ex-work-buf)
 519     (skip-chars-forward " \t")
 520     (if (looking-at "!")
 521         (progn
 522           (setq ex-g-variant (not ex-g-variant)
 523                 ex-g-flag (not ex-g-flag))
 524           (forward-char 1)
 525           (skip-chars-forward " \t")))
 526     (let ((c (following-char)))
 527       (if (string-match "[0-9A-Za-z]" (format "%c" c))
 528           (error
 529            "Global regexp must be inside matching non-alphanumeric chars"))
 530       (if (looking-at "[^\\\\\n]")
 531           (progn
 532             (forward-char 1)
 533             (set-mark (point))
 534             (let ((cont t))
 535               (while (and (not (eolp)) cont)
 536                 (if (not (re-search-forward (format "[^%c]*%c" c c) nil t))
 537                     (if (member ex-token '("global" "vglobal"))
 538                         (error
 539                          "Missing closing delimiter for global regexp")
 540                       (goto-char (point-max))))
 541                 (if (not (vip-looking-back
 542                           (format "[^\\\\]\\(\\\\\\\\\\)*\\\\%c" c)))
 543                     (setq cont nil))))
 544             (setq ex-token
 545                   (if (= (mark t) (point)) ""
 546                     (buffer-substring (1- (point)) (mark t))))
 547             (backward-char 1))
 548         (setq ex-token nil))
 549       c)))
 550
 551 ;; get an ex command
 552 (defun vip-get-ex-command ()
 553   (save-window-excursion
 554     (set-buffer vip-ex-work-buf)
 555     (if (looking-at "/") (forward-char 1))
 556     (skip-chars-forward " \t")
 557     (cond ((looking-at "[a-z]")
 558            (vip-get-ex-com-subr)
 559            (if (eq ex-token-type 'non-command)
 560                (error "`%s': %s" ex-token vip-BadExCommand)))
 561           ((looking-at "[!=><&~]")
 562            (setq ex-token (char-to-string (following-char)))
 563            (forward-char 1))
 564           (t (error vip-BadExCommand)))))
 565
 566 ;; Get an Ex option g or c
 567 (defun vip-get-ex-opt-gc (c)
 568   (save-window-excursion
 569     (set-buffer vip-ex-work-buf)
 570     (if (looking-at (format "%c" c)) (forward-char 1))
 571     (skip-chars-forward " \t")
 572     (cond ((looking-at "g")
 573            (setq ex-token "g")
 574            (forward-char 1)
 575            t)
 576           ((looking-at "c")
 577            (setq ex-token "c")
 578            (forward-char 1)
 579            t)
 580           (t nil))))
 581
 582 ;; Compute default addresses.  WHOLE-FLAG means use the whole buffer
 583 (defun vip-default-ex-addresses (&optional whole-flag)
 584   (cond ((null ex-addresses)
 585          (setq ex-addresses
 586                (if whole-flag
 587                    (cons (point-max) (cons (point-min) nil))
 588                  (cons (point) (cons (point) nil)))))
 589         ((null (cdr ex-addresses))
 590          (setq ex-addresses
 591                (cons (car ex-addresses) ex-addresses)))))
 592
 593 ;; Get an ex-address as a marker and set ex-flag if a flag is found
 594 (defun vip-get-ex-address ()
 595   (let ((address (point-marker)) (cont t))
 596     (setq ex-token "")
 597     (setq ex-flag nil)
 598     (while cont
 599       (vip-get-ex-token)
 600       (cond ((eq ex-token-type 'command)
 601              (if (member ex-token '("print" "list" "#"))
 602                  (progn
 603                    (setq ex-flag t
 604                          cont nil))
 605                (error "Address expected in this Ex command")))
 606             ((eq ex-token-type 'end-mark)
 607              (setq cont nil))
 608             ((eq ex-token-type 'whole)
 609              (error "Trailing address expected"))
 610             ((eq ex-token-type 'comma)
 611              (error "`%s': %s" ex-token vip-SpuriousText))
 612             (t (let ((ans (vip-get-ex-address-subr address (point-marker))))
 613                  (if ans (setq address ans))))))
 614     address))
 615
 616 ;; Returns an address as a point
 617 (defun vip-get-ex-address-subr (old-address dot)
 618   (let ((address nil))
 619     (if (null old-address) (setq old-address dot))
 620     (cond ((eq ex-token-type 'dot)
 621            (setq address dot))
 622           ((eq ex-token-type 'add-number)
 623            (save-excursion
 624              (goto-char old-address)
 625              (forward-line (if (= old-address 0) (1- ex-token) ex-token))
 626              (setq address (point-marker))))
 627           ((eq ex-token-type 'sub-number)
 628            (save-excursion
 629              (goto-char old-address)
 630              (forward-line (- ex-token))
 631              (setq address (point-marker))))
 632           ((eq ex-token-type 'abs-number)
 633            (save-excursion
 634              (goto-char (point-min))
 635              (if (= ex-token 0) (setq address 0)
 636                (forward-line (1- ex-token))
 637                (setq address (point-marker)))))
 638           ((eq ex-token-type 'end)
 639            (setq address (point-max-marker)))
 640           ((eq ex-token-type 'plus) t)  ; do nothing
 641           ((eq ex-token-type 'minus) t) ; do nothing
 642           ((eq ex-token-type 'search-forward)
 643            (save-excursion
 644              (ex-search-address t)
 645              (setq address (point-marker))))
 646           ((eq ex-token-type 'search-backward)
 647            (save-excursion
 648              (ex-search-address nil)
 649              (setq address (point-marker))))
 650           ((eq ex-token-type 'goto-mark)
 651            (save-excursion
 652              (if (null ex-token)
 653                  (exchange-point-and-mark)
 654                (goto-char (vip-register-to-point
 655                            (1+ (- ex-token ?a)) 'enforce-buffer)))
 656              (setq address (point-marker)))))
 657     address))
 658
 659
 660 ;; Search pattern and set address
 661 (defun ex-search-address (forward)
 662   (if (string= ex-token "")
 663       (if (null vip-s-string)
 664           (error vip-NoPrevSearch)
 665         (setq ex-token vip-s-string))
 666     (setq vip-s-string ex-token))
 667   (if forward
 668       (progn
 669         (forward-line 1)
 670         (re-search-forward ex-token))
 671     (forward-line -1)
 672     (re-search-backward ex-token)))
 673
 674 ;; Get a buffer name and set `ex-count' and `ex-flag' if found
 675 (defun vip-get-ex-buffer ()
 676   (setq ex-buffer nil)
 677   (setq ex-count nil)
 678   (setq ex-flag nil)
 679   (save-window-excursion
 680     (set-buffer vip-ex-work-buf)
 681     (skip-chars-forward " \t")
 682     (if (looking-at "[a-zA-Z]")
 683         (progn
 684           (setq ex-buffer (following-char))
 685           (forward-char 1)
 686           (skip-chars-forward " \t")))
 687     (if (looking-at "[0-9]")
 688         (progn
 689           (set-mark (point))
 690           (re-search-forward "[0-9][0-9]*")
 691           (setq ex-count (string-to-int (buffer-substring (point) (mark t))))
 692           (skip-chars-forward " \t")))
 693     (if (looking-at "[pl#]")
 694         (progn
 695           (setq ex-flag t)
 696           (forward-char 1)))
 697     (if (not (looking-at "[\n|]"))
 698         (error "`%s': %s" ex-token vip-SpuriousText))))
 699
 700 (defun vip-get-ex-count ()
 701   (setq ex-variant nil
 702         ex-count nil
 703         ex-flag nil)
 704   (save-window-excursion
 705     (set-buffer vip-ex-work-buf)
 706     (skip-chars-forward " \t")
 707     (if (looking-at "!")
 708         (progn
 709           (setq ex-variant t)
 710           (forward-char 1)))
 711     (skip-chars-forward " \t")
 712     (if (looking-at "[0-9]")
 713         (progn
 714           (set-mark (point))
 715           (re-search-forward "[0-9][0-9]*")
 716           (setq ex-count (string-to-int (buffer-substring (point) (mark t))))
 717           (skip-chars-forward " \t")))
 718     (if (looking-at "[pl#]")
 719         (progn
 720           (setq ex-flag t)
 721           (forward-char 1)))
 722     (if (not (looking-at "[\n|]"))
 723         (error "`%s': %s"
 724                (buffer-substring (point-min) (1- (point-max))) vip-BadExCommand))))
 725
 726 ;; Expand \% and \# in ex command
 727 (defun ex-expand-filsyms (cmd buf)
 728   (let (cf pf ret)
 729     (save-excursion
 730       (set-buffer buf)
 731       (setq cf buffer-file-name)
 732       (setq pf (ex-next nil t))) ; this finds alternative file name
 733     (if (and (null cf) (string-match "[^\\]%\\|\\`%" cmd))
 734         (error "No current file to substitute for `\%'"))
 735     (if (and (null pf) (string-match "[^\\]#\\|\\`#" cmd))
 736         (error "No alternate file to substitute for `#'"))
 737     (save-excursion
 738       (set-buffer (get-buffer-create vip-ex-tmp-buf-name))
 739       (erase-buffer)
 740       (insert cmd)
 741       (goto-char (point-min))
 742       (while (re-search-forward "%\\|#" nil t)
 743         (let ((data (match-data))
 744               (char (buffer-substring (match-beginning 0) (match-end 0))))
 745           (if (vip-looking-back (concat "\\\\" char))
 746               (replace-match char)
 747             (store-match-data data)
 748             (if (string= char "%")
 749                 (replace-match cf)
 750               (replace-match pf)))))
 751       (end-of-line)
 752       (setq ret (buffer-substring (point-min) (point)))
 753       (message "%s" ret))
 754     ret))
 755
 756 ;; Get a file name and set ex-variant, `ex-append' and `ex-offset' if found
 757 (defun vip-get-ex-file ()
 758   (let (prompt)
 759     (setq ex-file nil
 760           ex-variant nil
 761           ex-append nil
 762           ex-offset nil
 763           ex-cmdfile nil)
 764     (save-excursion
 765       (save-window-excursion
 766         (set-buffer vip-ex-work-buf)
 767         (skip-chars-forward " \t")
 768         (if (looking-at "!")
 769             (if (and (not (vip-looking-back "[ \t]"))
 770                      ;; read doesn't have a corresponding :r! form, so ! is
 771                      ;; immediately interpreted as a shell command.
 772                      (not (string= ex-token "read")))
 773                 (progn
 774                   (setq ex-variant t)
 775                   (forward-char 1)
 776                   (skip-chars-forward " \t"))
 777               (setq ex-cmdfile t)
 778               (forward-char 1)
 779               (skip-chars-forward " \t")))
 780         (if (looking-at ">>")
 781             (progn
 782               (setq ex-append t
 783                     ex-variant t)
 784               (forward-char 2)
 785               (skip-chars-forward " \t")))
 786         (if (looking-at "+")
 787             (progn
 788               (forward-char 1)
 789               (set-mark (point))
 790               (re-search-forward "[ \t\n]")
 791               (backward-char 1)
 792               (setq ex-offset (buffer-substring (point) (mark t)))
 793               (forward-char 1)
 794               (skip-chars-forward " \t")))
 795         ;; this takes care of :r, :w, etc., when they get file names
 796         ;; from the history list
 797         (if (member ex-token '("read" "write" "edit" "visual" "next"))
 798             (progn
 799               (setq ex-file (buffer-substring (point)  (1- (point-max))))
 800               (setq ex-file
 801                     ;; For :e, match multiple non-white strings separated
 802                     ;; by white. For others, find the first non-white string
 803                     (if (string-match
 804                          (if (string= ex-token "edit")
 805                              "[^ \t\n]+\\([ \t]+[^ \t\n]+\\)*"
 806                            "[^ \t\n]+")
 807                          ex-file)
 808                         (progn
 809                           ;; if file name comes from history, don't leave
 810                           ;; minibuffer when the user types space
 811                           (setq vip-incomplete-ex-cmd nil)
 812                           ;; this must be the last clause in this progn
 813                           (substring ex-file (match-beginning 0) (match-end 0))
 814                           )
 815                       ""))
 816               ;; this leaves only the command name in the work area
 817               ;; file names are gone
 818               (delete-region (point) (1- (point-max)))
 819               ))
 820         (goto-char (point-max))
 821         (skip-chars-backward " \t\n")
 822         (setq prompt (buffer-substring (point-min) (point)))
 823         ))
 824
 825     (setq vip-last-ex-prompt prompt)
 826
 827     ;; If we just finished reading command, redisplay prompt
 828     (if vip-incomplete-ex-cmd
 829         (setq ex-file (vip-ex-read-file-name (format ":%s " prompt)))
 830       ;; file was typed in-line
 831       (setq ex-file (or ex-file "")))
 832     ))
 833
 834
 835 ;; Completes file name or exits minibuffer. If Ex command accepts multiple
 836 ;; file names, arranges to re-enter the minibuffer.
 837 (defun vip-complete-filename-or-exit ()
 838   (interactive)
 839   (setq vip-keep-reading-filename t)
 840   ;; don't exit if directory---ex-commands don't
 841   (cond ((ex-cmd-accepts-multiple-files-p ex-token) (exit-minibuffer))
 842         (t (minibuffer-complete-word))))
 843
 844
 845 (defun ex-cmd-accepts-multiple-files-p (token)
 846   (member token '("edit" "next" "Next")))
 847
 848 ;; If user doesn't enter anything, then "" is returned, i.e., the
 849 ;; prompt-directory is not returned.
 850 (defun vip-ex-read-file-name (prompt)
 851   (let* ((str "")
 852          (minibuffer-local-completion-map
 853           (copy-keymap minibuffer-local-completion-map))
 854          beg end cont val)
 855
 856     (vip-add-keymap ex-read-filename-map minibuffer-local-completion-map)
 857
 858     (setq cont (setq vip-keep-reading-filename t))
 859     (while cont
 860       (setq vip-keep-reading-filename nil
 861             val (read-file-name (concat prompt str) nil default-directory)
 862             str  (concat str (if (equal val "") "" " ")
 863                          val (if (equal val "") "" " ")))
 864
 865       ;; Only edit, next, and Next commands accept multiple files.
 866       ;; vip-keep-reading-filename is set in the anonymous function that is
 867       ;; bound to " " in ex-read-filename-map.
 868       (setq cont (and vip-keep-reading-filename
 869                       (ex-cmd-accepts-multiple-files-p ex-token)))
 870       )
 871
 872     (setq beg (string-match "[^ \t]" str)   ; delete leading blanks
 873           end (string-match "[ \t]*$" str)) ; delete trailing blanks
 874     (if (member ex-token '("read" "write"))
 875           (if (string-match "[\t ]*!" str)
 876               ;; this is actually a shell command
 877               (progn
 878                 (setq ex-cmdfile t)
 879                 (setq beg (1+ beg))
 880                 (setq vip-last-ex-prompt (concat vip-last-ex-prompt " !")))))
 881     (substring str (or beg 0) end)))
 882
 883 ;; Execute ex command using the value of addresses
 884 (defun vip-execute-ex-command ()
 885   (vip-deactivate-mark)
 886   (cond ((string= ex-token "args") (ex-args))
 887         ((string= ex-token "copy") (ex-copy nil))
 888         ((string= ex-token "cd") (ex-cd))
 889         ((string= ex-token "chdir") (ex-cd))
 890         ((string= ex-token "delete") (ex-delete))
 891         ((string= ex-token "edit") (ex-edit))
 892         ((string= ex-token "file") (vip-info-on-file))
 893         ((string= ex-token "goto") (ex-goto))
 894         ((string= ex-token "help") (ex-help))
 895         ((string= ex-token "join") (ex-line "join"))
 896         ((string= ex-token "kmark") (ex-mark))
 897         ((string= ex-token "mark") (ex-mark))
 898         ((string= ex-token "map") (ex-map))
 899         ((string= ex-token "move") (ex-copy t))
 900         ((string= ex-token "next") (ex-next ex-cycle-other-window))
 901         ((string= ex-token "Next") (ex-next (not ex-cycle-other-window)))
 902         ((string= ex-token "RelatedFile") (ex-next-related-buffer 1))
 903         ((string= ex-token "put") (ex-put))
 904         ((string= ex-token "pwd") (ex-pwd))
 905         ((string= ex-token "preserve") (ex-preserve))
 906         ((string= ex-token "PreviousRelatedFile") (ex-next-related-buffer -1))
 907         ((string= ex-token "quit") (ex-quit))
 908         ((string= ex-token "read") (ex-read))
 909         ((string= ex-token "recover") (ex-recover))
 910         ((string= ex-token "rewind") (ex-rewind))
 911         ((string= ex-token "submitReport") (vip-submit-report))
 912         ((string= ex-token "set") (ex-set))
 913         ((string= ex-token "shell") (ex-shell))
 914         ((string= ex-token "source") (ex-source))
 915         ((string= ex-token "sr") (ex-substitute t t))
 916         ((string= ex-token "substitute") (ex-substitute))
 917         ((string= ex-token "suspend") (suspend-emacs))
 918         ((string= ex-token "stop") (suspend-emacs))
 919         ((string= ex-token "transfer") (ex-copy nil))
 920         ((string= ex-token "buffer") (if ex-cycle-other-window
 921                                          (vip-switch-to-buffer-other-window)
 922                                          (vip-switch-to-buffer)))
 923         ((string= ex-token "Buffer") (if ex-cycle-other-window
 924                                          (vip-switch-to-buffer)
 925                                          (vip-switch-to-buffer-other-window)))
 926         ((string= ex-token "tag") (ex-tag))
 927         ((string= ex-token "undo") (vip-undo))
 928         ((string= ex-token "unmap") (ex-unmap))
 929         ((string= ex-token "version") (vip-version))
 930         ((string= ex-token "visual") (ex-edit))
 931         ((string= ex-token "write") (ex-write nil))
 932         ((string= ex-token "Write") (save-some-buffers))
 933         ((string= ex-token "wq") (ex-write t))
 934         ((string= ex-token "WWrite") (save-some-buffers t)) ; don't ask
 935         ((string= ex-token "xit") (ex-write t))
 936         ((string= ex-token "yank") (ex-yank))
 937         ((string= ex-token "!") (ex-command))
 938         ((string= ex-token "=") (ex-line-no))
 939         ((string= ex-token ">") (ex-line "right"))
 940         ((string= ex-token "<") (ex-line "left"))
 941         ((string= ex-token "&") (ex-substitute t))
 942         ((string= ex-token "~") (ex-substitute t t))
 943         ((or (string= ex-token "append")
 944              (string= ex-token "change")
 945              (string= ex-token "insert")
 946              (string= ex-token "open"))
 947          (error
 948           (format "`%s': Obsolete command, not supported by Viper"
 949                   ex-token)))
 950         ((or (string= ex-token "abbreviate")
 951              (string= ex-token "unabbreviate"))
 952          (error
 953           (format
 954            "`%s': Vi-style abbrevs are obsolete. Use the more powerful Emacs abbrevs"
 955            ex-token)))
 956         ((or (string= ex-token "list")
 957              (string= ex-token "print")
 958              (string= ex-token "z")
 959              (string= ex-token "#"))
 960          (error
 961           (format "`%s': Command not implemented in Viper" ex-token)))
 962         (t (error (format "`%s': %s" ex-token vip-BadExCommand)))))
 963
 964 (defun vip-undisplayed-files ()
 965   (mapcar
 966    (function
 967     (lambda (b)
 968       (if (null (get-buffer-window b))
 969           (let ((f (buffer-file-name b)))
 970             (if f f
 971               (if ex-cycle-through-non-files
 972                   (let ((s (buffer-name b)))
 973                     (if (string= " " (substring s 0 1))
 974                         nil
 975                       s))
 976                 nil)))
 977         nil)))
 978    (buffer-list)))
 979
 980
 981 (defun ex-args ()
 982   (let ((l (vip-undisplayed-files))
 983         (args "")
 984         (file-count 1))
 985     (while (not (null l))
 986       (if (car l)
 987           (setq args (format "%s %d) %s\n" args file-count (car l))
 988                 file-count (1+ file-count)))
 989       (setq l (cdr l)))
 990     (if (string= args "")
 991         (message "All files are already displayed")
 992       (save-excursion
 993         (save-window-excursion
 994           (with-output-to-temp-buffer " *vip-info*"
 995             (princ "\n\nThese files are not displayed in any window.\n")
 996             (princ "\n=============\n")
 997             (princ args)
 998             (princ "\n=============\n")
 999             (princ "\nThe numbers can be given as counts to :next. ")
1000             (princ "\n\nPress any key to continue...\n\n"))
1001           (vip-read-event))))))
1002
1003 ;; Ex cd command. Default directory of this buffer changes
1004 (defun ex-cd ()
1005   (vip-get-ex-file)
1006   (if (string= ex-file "")
1007       (setq ex-file "~"))
1008   (setq default-directory (file-name-as-directory (expand-file-name ex-file))))
1009
1010 ;; Ex copy and move command.  DEL-FLAG means delete
1011 (defun ex-copy (del-flag)
1012   (vip-default-ex-addresses)
1013   (let ((address (vip-get-ex-address))
1014         (end (car ex-addresses)) (beg (car (cdr ex-addresses))))
1015     (goto-char end)
1016     (save-excursion
1017       (push-mark beg t)
1018       (vip-enlarge-region (mark t) (point))
1019       (if del-flag
1020           (kill-region (point) (mark t))
1021         (copy-region-as-kill (point) (mark t)))
1022       (if ex-flag
1023           (progn
1024             (with-output-to-temp-buffer "*copy text*"
1025               (princ
1026                (if (or del-flag ex-g-flag ex-g-variant)
1027                    (current-kill 0)
1028                  (buffer-substring (point) (mark t)))))
1029             (condition-case nil
1030                 (progn
1031                   (read-string "[Hit return to continue] ")
1032                   (save-excursion (kill-buffer "*copy text*")))
1033               (quit (save-excursion (kill-buffer "*copy text*"))
1034                     (signal 'quit nil))))))
1035     (if (= address 0)
1036         (goto-char (point-min))
1037       (goto-char address)
1038       (forward-line 1))
1039       (insert (current-kill 0))))
1040
1041 ;; Ex delete command
1042 (defun ex-delete ()
1043   (vip-default-ex-addresses)
1044   (vip-get-ex-buffer)
1045   (let ((end (car ex-addresses)) (beg (car (cdr ex-addresses))))
1046     (if (> beg end) (error vip-FirstAddrExceedsSecond))
1047     (save-excursion
1048       (vip-enlarge-region beg end)
1049       (exchange-point-and-mark)
1050       (if ex-count
1051           (progn
1052             (set-mark (point))
1053             (forward-line (1- ex-count)))
1054         (set-mark end))
1055       (vip-enlarge-region (point) (mark t))
1056       (if ex-flag
1057           ;; show text to be deleted and ask for confirmation
1058           (progn
1059             (with-output-to-temp-buffer " *delete text*"
1060               (princ (buffer-substring (point) (mark t))))
1061             (condition-case nil
1062                 (read-string "[Hit return to continue] ")
1063               (quit
1064                (save-excursion (kill-buffer " *delete text*"))
1065                (error "")))
1066             (save-excursion (kill-buffer " *delete text*")))
1067         (if ex-buffer
1068             (cond ((vip-valid-register ex-buffer '(Letter))
1069                    (vip-append-to-register
1070                     (downcase ex-buffer) (point) (mark t)))
1071                   ((vip-valid-register ex-buffer)
1072                    (copy-to-register ex-buffer (point) (mark t) nil))
1073                   (t (error vip-InvalidRegister ex-buffer))))
1074         (kill-region (point) (mark t))))))
1075
1076
1077
1078 ;; Ex edit command
1079 ;; In Viper, `e' and `e!' behave identically. In both cases, the user is
1080 ;; asked if current buffer should really be discarded.
1081 ;; This command can take multiple file names. It replaces the current buffer
1082 ;; with the first file in its argument list
1083 (defun ex-edit (&optional file)
1084   (if (not file)
1085       (vip-get-ex-file))
1086   (cond ((and (string= ex-file "") buffer-file-name)
1087          (setq ex-file  (abbreviate-file-name (buffer-file-name))))
1088         ((string= ex-file "")
1089          (error vip-NoFileSpecified)))
1090
1091   (let (msg do-edit)
1092     (if buffer-file-name
1093         (cond ((buffer-modified-p)
1094                (setq msg
1095                      (format "Buffer %s is modified. Discard changes? "
1096                              (buffer-name))
1097                      do-edit t))
1098               ((not (verify-visited-file-modtime (current-buffer)))
1099                (setq msg
1100                      (format "File %s changed on disk.  Reread from disk? "
1101                              buffer-file-name)
1102                      do-edit t))
1103               (t (setq do-edit nil))))
1104
1105     (if do-edit
1106         (if (yes-or-no-p msg)
1107             (progn
1108               (set-buffer-modified-p nil)
1109               (kill-buffer (current-buffer)))
1110           (message "Buffer %s was left intact" (buffer-name))))
1111     ) ; let
1112
1113   (if (null (setq file (get-file-buffer ex-file)))
1114       (progn
1115         (ex-find-file ex-file)
1116         (vip-change-state-to-vi)
1117         (goto-char (point-min)))
1118     (switch-to-buffer file))
1119   (if ex-offset
1120       (progn
1121         (save-window-excursion
1122           (set-buffer vip-ex-work-buf)
1123           (delete-region (point-min) (point-max))
1124           (insert ex-offset "\n")
1125           (goto-char (point-min)))
1126         (goto-char (vip-get-ex-address))
1127         (beginning-of-line)))
1128   (ex-fixup-history vip-last-ex-prompt ex-file))
1129
1130 ;; splits the string FILESPEC into substrings separated by newlines `\012'
1131 ;; each line assumed to be a file name. find-file's each file thus obtained.
1132 (defun ex-find-file (filespec)
1133   (let (f filebuf tmp-buf status)
1134     (if (string-match "[^a-zA-Z0-9_.-/]" filespec)
1135         (progn
1136           (save-excursion
1137             (set-buffer (setq tmp-buf (get-buffer-create vip-ex-tmp-buf-name)))
1138             (erase-buffer)
1139             (setq status
1140                   (call-process ex-find-file-shell nil t nil
1141                                 ex-find-file-shell-options
1142                                 "-c"
1143                                 (format "echo %s | tr ' ' '\\012'" filespec)))
1144             (goto-char (point-min))
1145             ;; Issue an error, if no match.
1146             (if (> status 0)
1147                 (save-excursion
1148                   (skip-chars-forward " \t\n\j")
1149                   (if (looking-at "echo:")
1150                       (vip-forward-word 1))
1151                   (error "%S%s"
1152                          filespec
1153                          (buffer-substring (point) (vip-line-pos 'end)))
1154                   ))
1155             (reverse-region (point-min) (point-max))
1156             (goto-char (point-min))
1157             (while (not (eobp))
1158               (setq f (buffer-substring (point) (vip-line-pos 'end)))
1159               (setq filebuf (find-file f))
1160               (set-buffer tmp-buf) ; otherwise it'll be in f.
1161               (forward-to-indentation 1))
1162             ))
1163       (setq filebuf (find-file-noselect (setq f filespec))))
1164     (switch-to-buffer filebuf)
1165     ))
1166
1167 ;; Ex global command
1168 (defun ex-global (variant)
1169   (let ((gcommand ex-token))
1170     (if (or ex-g-flag ex-g-variant)
1171         (error "`%s' within `global' is not allowed" gcommand)
1172       (if variant
1173           (setq ex-g-flag nil
1174                 ex-g-variant t)
1175         (setq ex-g-flag t
1176               ex-g-variant nil)))
1177     (vip-get-ex-pat)
1178     (if (null ex-token)
1179         (error "`%s': Missing regular expression" gcommand)))
1180
1181   (if (string= ex-token "")
1182       (if (null vip-s-string)
1183           (error vip-NoPrevSearch)
1184         (setq ex-g-pat vip-s-string))
1185     (setq ex-g-pat ex-token
1186           vip-s-string ex-token))
1187   (if (null ex-addresses)
1188       (setq ex-addresses (list (point-max) (point-min)))
1189     (vip-default-ex-addresses))
1190   (let ((marks nil) (mark-count 0)
1191         com-str (end (car ex-addresses)) (beg (car (cdr ex-addresses))))
1192     (if (> beg end) (error vip-FirstAddrExceedsSecond))
1193     (save-excursion
1194       (vip-enlarge-region beg end)
1195       (exchange-point-and-mark)
1196       (let ((cont t) (limit (point-marker)))
1197         (exchange-point-and-mark)
1198         ;; skip the last line if empty
1199         (beginning-of-line)
1200         (if (eobp) (vip-backward-char-carefully))
1201         (while (and cont (not (bobp)) (>= (point) limit))
1202           (beginning-of-line)
1203           (set-mark (point))
1204           (end-of-line)
1205           (let ((found (re-search-backward ex-g-pat (mark t) t)))
1206             (if (or (and ex-g-flag found)
1207                     (and ex-g-variant (not found)))
1208                 (progn
1209                   (end-of-line)
1210                   (setq mark-count (1+ mark-count))
1211                   (setq marks (cons (point-marker) marks)))))
1212           (beginning-of-line)
1213           (if (bobp) (setq cont nil)
1214             (forward-line -1)
1215             (end-of-line)))))
1216     (save-window-excursion
1217       (set-buffer vip-ex-work-buf)
1218       (setq com-str (buffer-substring (1+ (point)) (1- (point-max)))))
1219     (while marks
1220       (goto-char (car marks))
1221       (vip-ex com-str)
1222       (setq mark-count (1- mark-count))
1223       (setq marks (cdr marks)))))
1224
1225 ;; Ex goto command
1226 (defun ex-goto ()
1227   (if (null ex-addresses)
1228       (setq ex-addresses (cons (point) nil)))
1229   (push-mark (point) t)
1230   (goto-char (car ex-addresses))
1231   (beginning-of-line))
1232
1233 ;; Ex line commands.  COM is join, shift-right or shift-left
1234 (defun ex-line (com)
1235   (vip-default-ex-addresses)
1236   (vip-get-ex-count)
1237   (let ((end (car ex-addresses)) (beg (car (cdr ex-addresses))) point)
1238     (if (> beg end) (error vip-FirstAddrExceedsSecond))
1239     (save-excursion
1240       (vip-enlarge-region beg end)
1241       (exchange-point-and-mark)
1242       (if ex-count
1243           (progn
1244             (set-mark (point))
1245             (forward-line ex-count)))
1246       (if ex-flag
1247           ;; show text to be joined and ask for confirmation
1248           (progn
1249             (with-output-to-temp-buffer " *text*"
1250               (princ (buffer-substring (point) (mark t))))
1251             (condition-case nil
1252                 (progn
1253                   (read-string "[Hit return to continue] ")
1254                   (ex-line-subr com (point) (mark t)))
1255               (quit (ding)))
1256             (save-excursion (kill-buffer " *text*")))
1257         (ex-line-subr com (point) (mark t)))
1258       (setq point (point)))
1259     (goto-char (1- point))
1260     (beginning-of-line)))
1261
1262 (defun ex-line-subr (com beg end)
1263   (cond ((string= com "join")
1264          (goto-char (min beg end))
1265          (while (and (not (eobp)) (< (point) (max beg end)))
1266            (end-of-line)
1267            (if (and (<= (point) (max beg end)) (not (eobp)))
1268                (progn
1269                  (forward-line 1)
1270                  (delete-region (point) (1- (point)))
1271                  (if (not ex-variant) (fixup-whitespace))))))
1272         ((or (string= com "right") (string= com "left"))
1273          (indent-rigidly
1274           (min beg end) (max beg end)
1275           (if (string= com "right") vip-shift-width (- vip-shift-width)))
1276          (goto-char (max beg end))
1277          (end-of-line)
1278          (vip-forward-char-carefully))))
1279
1280
1281 ;; Ex mark command
1282 (defun ex-mark ()
1283   (let (char)
1284     (if (null ex-addresses)
1285         (setq ex-addresses
1286               (cons (point) nil)))
1287     (save-window-excursion
1288       (set-buffer vip-ex-work-buf)
1289       (skip-chars-forward " \t")
1290       (if (looking-at "[a-z]")
1291           (progn
1292             (setq char (following-char))
1293             (forward-char 1)
1294             (skip-chars-forward " \t")
1295             (if (not (looking-at "[\n|]"))
1296                 (error "`%s': %s" ex-token vip-SpuriousText)))
1297         (error "`%s' requires a following letter" ex-token)))
1298     (save-excursion
1299       (goto-char (car ex-addresses))
1300       (point-to-register (1+ (- char ?a))))))
1301
1302
1303
1304 ;; Alternate file is the file next to the first one in the buffer ring
1305 (defun ex-next (cycle-other-window &optional find-alt-file)
1306   (catch 'ex-edit
1307     (let (count l)
1308       (if (not find-alt-file)
1309           (progn
1310             (vip-get-ex-file)
1311             (if (or (char-or-string-p ex-offset)
1312                     (and (not (string= "" ex-file))
1313                          (not (string-match "^[0-9]+$" ex-file))))
1314                 (progn
1315                   (ex-edit t)
1316                   (throw 'ex-edit nil))
1317               (setq count (string-to-int ex-file))
1318               (if (= count 0) (setq count 1))
1319               (if (< count 0) (error "Usage: `next <count>' (count >= 0)"))))
1320         (setq count 1))
1321       (setq l (vip-undisplayed-files))
1322       (while (> count 0)
1323         (while (and (not (null l)) (null (car l)))
1324           (setq l (cdr l)))
1325         (setq count (1- count))
1326         (if (> count 0)
1327             (setq l (cdr l))))
1328       (if find-alt-file (car l)
1329         (progn
1330           (if (car l)
1331               (let* ((w (if cycle-other-window
1332                             (get-lru-window) (selected-window)))
1333                      (b (window-buffer w)))
1334                 (set-window-buffer w (get-file-buffer (car l)))
1335                 (bury-buffer b)
1336                 ;; this puts "next <count>" in the ex-command history
1337                 (ex-fixup-history vip-last-ex-prompt ex-file))
1338             (error "Not that many undisplayed files")))))))
1339
1340
1341 (defun ex-next-related-buffer (direction &optional no-recursion)
1342
1343   (vip-ring-rotate1 vip-related-files-and-buffers-ring direction)
1344
1345   (let ((file-or-buffer-name
1346          (vip-current-ring-item vip-related-files-and-buffers-ring))
1347         (old-ring vip-related-files-and-buffers-ring)
1348         (old-win (selected-window))
1349         skip-rest buf wind)
1350
1351     (or (and (ring-p vip-related-files-and-buffers-ring)
1352              (> (ring-length vip-related-files-and-buffers-ring) 0))
1353         (error "This buffer has no related files or buffers"))
1354
1355     (or (stringp file-or-buffer-name)
1356         (error
1357          "File and buffer names must be strings, %S" file-or-buffer-name))
1358
1359     (setq buf (cond ((get-buffer file-or-buffer-name))
1360                     ((file-exists-p file-or-buffer-name)
1361                      (find-file-noselect file-or-buffer-name))
1362                     ))
1363
1364     (if (not (vip-buffer-live-p buf))
1365         (error "Didn't find buffer %S or file %S"
1366                file-or-buffer-name
1367                (abbreviate-file-name (expand-file-name file-or-buffer-name))))
1368
1369     (if (equal buf (current-buffer))
1370         (or no-recursion
1371             ;; try again
1372             (progn
1373               (setq skip-rest t)
1374               (ex-next-related-buffer direction 'norecursion))))
1375
1376     (if skip-rest
1377         ()
1378       ;; setup buffer
1379       (if (setq wind (vip-get-visible-buffer-window buf))
1380           ()
1381         (setq wind (get-lru-window (if vip-xemacs-p nil 'visible)))
1382         (set-window-buffer wind buf))
1383
1384       (if (vip-window-display-p)
1385           (progn
1386             (raise-frame (window-frame wind))
1387             (if (equal (window-frame wind) (window-frame old-win))
1388                 (save-window-excursion (select-window wind) (sit-for 1))
1389               (select-window wind)))
1390         (save-window-excursion (select-window wind) (sit-for 1)))
1391
1392       (save-excursion
1393         (set-buffer buf)
1394         (setq vip-related-files-and-buffers-ring old-ring))
1395
1396       (setq vip-local-search-start-marker (point-marker))
1397       )))
1398
1399
1400 ;; Force auto save
1401 (defun ex-preserve ()
1402   (message "Autosaving all buffers that need to be saved...")
1403   (do-auto-save t))
1404
1405 ;; Ex put
1406 (defun ex-put ()
1407   (let ((point (if (null ex-addresses) (point) (car ex-addresses))))
1408     (vip-get-ex-buffer)
1409     (setq vip-use-register ex-buffer)
1410     (goto-char point)
1411     (if (bobp) (vip-Put-back 1) (vip-put-back 1))))
1412
1413 ;; Ex print working directory
1414 (defun ex-pwd ()
1415   (message default-directory))
1416
1417 ;; Ex quit command
1418 (defun ex-quit ()
1419   ;; skip "!", if it is q!. In Viper q!, w!, etc., behave as q, w, etc.
1420   (save-excursion
1421     (set-buffer vip-ex-work-buf)
1422     (if (looking-at "!") (forward-char 1)))
1423   (if (< vip-expert-level 3)
1424       (save-buffers-kill-emacs)
1425     (kill-buffer (current-buffer))))
1426
1427
1428 ;; Ex read command
1429 (defun ex-read ()
1430   (vip-get-ex-file)
1431   (let ((point (if (null ex-addresses) (point) (car ex-addresses))))
1432     (goto-char point)
1433     (vip-add-newline-at-eob-if-necessary)
1434     (if (not (or (bobp) (eobp))) (forward-line 1))
1435     (if (and (not ex-variant) (string= ex-file ""))
1436         (progn
1437           (if (null buffer-file-name)
1438               (error vip-NoFileSpecified))
1439           (setq ex-file buffer-file-name)))
1440     (if ex-cmdfile
1441         (shell-command ex-file t)
1442       (insert-file-contents ex-file)))
1443   (ex-fixup-history vip-last-ex-prompt ex-file))
1444
1445 ;; this function fixes ex-history for some commands like ex-read, ex-edit
1446 (defun ex-fixup-history (&rest args)
1447   (setq vip-ex-history
1448         (cons (mapconcat 'identity args " ") (cdr vip-ex-history))))
1449
1450
1451 ;; Ex recover from emacs \#file\#
1452 (defun ex-recover ()
1453   (vip-get-ex-file)
1454   (if (or ex-append ex-offset)
1455       (error "`recover': %s" vip-SpuriousText))
1456   (if (string= ex-file "")
1457       (progn
1458         (if (null buffer-file-name)
1459             (error "This buffer isn't visiting any file"))
1460         (setq ex-file buffer-file-name))
1461     (setq ex-file (expand-file-name ex-file)))
1462   (if (and (not (string= ex-file (buffer-file-name)))
1463            (buffer-modified-p)
1464            (not ex-variant))
1465       (error "No write since last change \(:rec! overrides\)"))
1466   (recover-file ex-file))
1467
1468 ;; Tell that `rewind' is obsolete and to use `:next count' instead
1469 (defun ex-rewind ()
1470   (message
1471    "Use `:n <count>' instead. Counts are obtained from the `:args' command"))
1472
1473
1474 ;; read variable name for ex-set
1475 (defun ex-set-read-variable ()
1476   (let ((minibuffer-local-completion-map
1477          (copy-keymap minibuffer-local-completion-map))
1478         (cursor-in-echo-area t)
1479         str batch)
1480     (define-key
1481       minibuffer-local-completion-map " " 'minibuffer-complete-and-exit)
1482     (define-key minibuffer-local-completion-map "=" 'exit-minibuffer)
1483     (if (vip-set-unread-command-events
1484          (ex-get-inline-cmd-args "[ \t]*[a-zA-Z]*[ \t]*" nil "\C-m"))
1485         (progn
1486           (setq batch t)
1487           (vip-set-unread-command-events ?\C-m)))
1488     (message ":set  <Variable> [= <Value>]")
1489     (or batch (sit-for 2))
1490
1491     (while (string-match "^[ \\t\\n]*$"
1492                          (setq str
1493                                (completing-read ":set " ex-variable-alist)))
1494       (message ":set <Variable> ")
1495       ;; if there are unread events, don't wait
1496       (or (vip-set-unread-command-events "") (sit-for 2))
1497       ) ; while
1498     str))
1499
1500
1501 (defun ex-set ()
1502   (let ((var (ex-set-read-variable))
1503         (val 0)
1504         (set-cmd "setq")
1505         (ask-if-save t)
1506         (auto-cmd-label "; don't touch or else...")
1507         (delete-turn-on-auto-fill-pattern
1508          "([ \t]*add-hook[ \t]+'vip-insert-state-hooks[ \t]+'turn-on-auto-fill.*)")
1509         actual-lisp-cmd lisp-cmd-del-pattern
1510         val2 orig-var)
1511     (setq orig-var var)
1512     (cond ((member var '("ai" "autoindent"))
1513            (setq var "vip-auto-indent"
1514                  set-cmd "setq"
1515                  ask-if-save nil
1516                  val "t"))
1517           ((member var '("gai" "global-autoindent"))
1518            (kill-local-variable 'vip-auto-indent)
1519            (setq var "vip-auto-indent"
1520                  set-cmd "setq-default"
1521                  val "t"))
1522           ((member var '("noai" "noautoindent"))
1523            (setq var "vip-auto-indent"
1524                  ask-if-save nil
1525                  val "nil"))
1526           ((member var '("gnoai" "global-noautoindent"))
1527            (kill-local-variable 'vip-auto-indent)
1528            (setq var "vip-auto-indent"
1529                  set-cmd "setq-default"
1530                  val "nil"))
1531           ((member var '("ic" "ignorecase"))
1532            (setq var "vip-case-fold-search"
1533                  val "t"))
1534           ((member var '("noic" "noignorecase"))
1535            (setq var "vip-case-fold-search"
1536                  val "nil"))
1537           ((member var '("ma" "magic"))
1538            (setq var "vip-re-search"
1539                  val "t"))
1540           ((member var '("noma" "nomagic"))
1541            (setq var "vip-re-search"
1542                  val "nil"))
1543           ((member var '("ro" "readonly"))
1544            (setq var "buffer-read-only"
1545                  val "t"))
1546           ((member var '("noro" "noreadonly"))
1547            (setq var "buffer-read-only"
1548                  val "nil"))
1549           ((member var '("sm" "showmatch"))
1550            (setq var "blink-matching-paren"
1551                  val "t"))
1552           ((member var '("nosm" "noshowmatch"))
1553            (setq var "blink-matching-paren"
1554                  val "nil"))
1555           ((member var '("ws" "wrapscan"))
1556            (setq var "vip-search-wrap-around-t"
1557                  val "t"))
1558           ((member var '("nows" "nowrapscan"))
1559            (setq var "vip-search-wrap-around-t"
1560                  val "nil")))
1561     (if (eq val 0) ; value must be set by the user
1562         (let ((cursor-in-echo-area t))
1563           (message (format ":set %s = <Value>" var))
1564           ;; if there are unread events, don't wait
1565           (or (vip-set-unread-command-events "") (sit-for 2))
1566           (setq val (read-string (format ":set %s = " var)))
1567           (ex-fixup-history "set" orig-var val)
1568
1569           ;; check numerical values
1570           (if (member var
1571                       '("sw" "shiftwidth"
1572                         "ts" "tabstop"
1573                         "gts" "global-tabstop"
1574                         "wm" "wrapmargin"))
1575               (condition-case nil
1576                   (or (numberp (setq val2 (car (read-from-string val))))
1577                       (error "%s: Invalid value, numberp, %S" var val))
1578                 (error
1579                  (error "%s: Invalid value, numberp, %S" var val))))
1580
1581           (cond
1582            ((member var '("sw" "shiftwidth"))
1583             (setq var "vip-shift-width"))
1584            ((member var '("ts" "tabstop"))
1585             ;; make it take effect in curr buff and new bufs
1586             (setq var "tab-width"
1587                   set-cmd "setq"
1588                   ask-if-save nil))
1589            ((member var '("gts" "global-tabstop"))
1590             (kill-local-variable 'tab-width)
1591             (setq var "tab-width"
1592                   set-cmd "setq-default"))
1593            ((member var '("wm" "wrapmargin"))
1594             ;; make it take effect in curr buff and new bufs
1595             (kill-local-variable 'fill-column)
1596             (setq var "fill-column"
1597                   val (format "(- (window-width) %s)" val)
1598                   set-cmd "setq-default"))
1599            ((member var '("sh" "shell"))
1600             (setq var "explicit-shell-file-name"
1601                   val (format "\"%s\"" val)))))
1602       (ex-fixup-history "set" orig-var))
1603
1604     (setq actual-lisp-cmd (format "\n(%s %s %s) %s"
1605                                   set-cmd var val auto-cmd-label))
1606     (setq lisp-cmd-del-pattern
1607           (format "^\n?[ \t]*([ \t]*%s[ \t]+%s[ \t].*)[ \t]*%s"
1608                   set-cmd var auto-cmd-label))
1609
1610     (if (and ask-if-save
1611              (y-or-n-p (format "Do you want to save this setting in %s "
1612                                vip-custom-file-name)))
1613         (progn
1614           (vip-save-string-in-file
1615            actual-lisp-cmd vip-custom-file-name
1616            ;; del pattern
1617            lisp-cmd-del-pattern)
1618           (if (string= var "fill-column")
1619               (if (> val2 0)
1620                   (vip-save-string-in-file
1621                    (concat
1622                     "(add-hook 'vip-insert-state-hooks 'turn-on-auto-fill) "
1623                     auto-cmd-label)
1624                    vip-custom-file-name
1625                    delete-turn-on-auto-fill-pattern)
1626                 (vip-save-string-in-file
1627                  nil vip-custom-file-name delete-turn-on-auto-fill-pattern)
1628                 (vip-save-string-in-file
1629                  nil vip-custom-file-name
1630                  ;; del pattern
1631                  lisp-cmd-del-pattern)
1632                 ))
1633           ))
1634
1635     (message (format "%s %s %s" set-cmd var (if (string-match "^[ \t]*$" val)
1636                                                 (format "%S" val)
1637                                               val)))
1638     (eval (car (read-from-string actual-lisp-cmd)))
1639         (if (string= var "fill-column")
1640                 (if (> val2 0)
1641                         (auto-fill-mode 1)
1642                   (auto-fill-mode -1)))
1643
1644     ))
1645
1646 ;; In inline args, skip regex-forw and (optionally) chars-back.
1647 ;; Optional 3d arg is a string that should replace ' ' to prevent its
1648 ;; special meaning
1649 (defun ex-get-inline-cmd-args (regex-forw &optional chars-back replace-str)
1650   (save-excursion
1651     (set-buffer vip-ex-work-buf)
1652     (goto-char (point-min))
1653     (re-search-forward regex-forw nil t)
1654     (let ((beg (point))
1655           end)
1656       (goto-char (point-max))
1657       (if chars-back
1658           (skip-chars-backward chars-back)
1659         (skip-chars-backward " \t\n\C-m"))
1660       (setq end (point))
1661       ;; replace SPC with `=' to suppress the special meaning SPC has
1662       ;; in Ex commands
1663       (goto-char beg)
1664       (if replace-str
1665           (while (re-search-forward " +" nil t)
1666             (replace-match replace-str nil t)
1667             (vip-forward-char-carefully)))
1668       (goto-char end)
1669       (buffer-substring beg end))))
1670
1671
1672 ;; Ex shell command
1673 (defun ex-shell ()
1674   (shell))
1675
1676 ;; Viper help. Invokes Info
1677 (defun ex-help ()
1678   (condition-case nil
1679       (progn
1680         (pop-to-buffer (get-buffer-create "*info*"))
1681         (info "viper.info")
1682         (message "Type `i' to search for a specific topic"))
1683     (error (beep 1)
1684            (with-output-to-temp-buffer " *vip-info*"
1685              (princ (format "
1686 The Info file for Viper does not seem to be installed.
1687
1688 This file is part of the standard distribution of %sEmacs.
1689 Please contact your system administrator. "
1690                             (if vip-xemacs-p "X" "")
1691                             ))))))
1692
1693 ;; Ex source command. Loads the file specified as argument or `~/.vip'
1694 (defun ex-source ()
1695   (vip-get-ex-file)
1696   (if (string= ex-file "")
1697       (load vip-custom-file-name)
1698     (load ex-file)))
1699
1700 ;; Ex substitute command
1701 ;; If REPEAT use previous regexp which is ex-reg-exp or vip-s-string
1702 (defun ex-substitute (&optional repeat r-flag)
1703   (let ((opt-g nil)
1704         (opt-c nil)
1705         (matched-pos nil)
1706         (case-fold-search vip-case-fold-search)
1707         delim pat repl)
1708     (if repeat (setq ex-token nil) (setq delim (vip-get-ex-pat)))
1709     (if (null ex-token)
1710         (progn
1711           (setq pat (if r-flag vip-s-string ex-reg-exp))
1712           (or (stringp pat)
1713               (error "No previous pattern to use in substitution"))
1714           (setq repl ex-repl
1715                 delim (string-to-char pat)))
1716       (setq pat (if (string= ex-token "") vip-s-string ex-token))
1717       (setq vip-s-string pat
1718             ex-reg-exp pat)
1719       (setq delim (vip-get-ex-pat))
1720       (if (null ex-token)
1721           (setq ex-token ""
1722                 ex-repl "")
1723         (setq repl ex-token
1724               ex-repl ex-token)))
1725     (while (vip-get-ex-opt-gc delim)
1726       (if (string= ex-token "g") (setq opt-g t) (setq opt-c t)))
1727     (vip-get-ex-count)
1728     (if ex-count
1729         (save-excursion
1730           (if ex-addresses (goto-char (car ex-addresses)))
1731           (set-mark (point))
1732           (forward-line (1- ex-count))
1733           (setq ex-addresses (cons (point) (cons (mark t) nil))))
1734       (if (null ex-addresses)
1735           (setq ex-addresses (cons (point) (cons (point) nil)))
1736         (if (null (cdr ex-addresses))
1737             (setq ex-addresses (cons (car ex-addresses) ex-addresses)))))
1738                                         ;(setq G opt-g)
1739     (let ((beg (car ex-addresses))
1740           (end (car (cdr ex-addresses)))
1741           eol-mark)
1742       (save-excursion
1743         (vip-enlarge-region beg end)
1744         (let ((limit (save-excursion
1745                        (goto-char (max (point) (mark t)))
1746                        (point-marker))))
1747           (goto-char (min (point) (mark t)))
1748           (while (< (point) limit)
1749             (end-of-line)
1750             (setq eol-mark (point-marker))
1751             (beginning-of-line)
1752             (if opt-g
1753                 (progn
1754                   (while (and (not (eolp))
1755                               (re-search-forward pat eol-mark t))
1756                     (if (or (not opt-c) (y-or-n-p "Replace? "))
1757                         (progn
1758                           (setq matched-pos (point))
1759                           (if (not (stringp repl))
1760                               (error "Can't perform Ex substitution: No previous replacement pattern"))
1761                           (replace-match repl t))))
1762                   (end-of-line)
1763                   (vip-forward-char-carefully))
1764               (if (null pat)
1765                   (error
1766                    "Can't repeat Ex substitution: No previous regular expression"))
1767               (if (and (re-search-forward pat eol-mark t)
1768                        (or (not opt-c) (y-or-n-p "Replace? ")))
1769                   (progn
1770                     (setq matched-pos (point))
1771                     (if (not (stringp repl))
1772                         (error "Can't perform Ex substitution: No previous replacement pattern"))
1773                     (replace-match repl t)))
1774               (end-of-line)
1775               (vip-forward-char-carefully))))))
1776     (if matched-pos (goto-char matched-pos))
1777     (beginning-of-line)
1778     (if opt-c (message "done"))))
1779
1780 ;; Ex tag command
1781 (defun ex-tag ()
1782   (let (tag)
1783     (save-window-excursion
1784       (set-buffer vip-ex-work-buf)
1785       (skip-chars-forward " \t")
1786       (set-mark (point))
1787       (skip-chars-forward "^ |\t\n")
1788       (setq tag (buffer-substring (mark t) (point))))
1789     (if (not (string= tag "")) (setq ex-tag tag))
1790     (vip-change-state-to-emacs)
1791     (condition-case conds
1792         (progn
1793           (if (string= tag "")
1794               (find-tag ex-tag t)
1795             (find-tag-other-window ex-tag))
1796           (vip-change-state-to-vi))
1797       (error
1798        (vip-change-state-to-vi)
1799        (vip-message-conditions conds)))))
1800
1801 ;; Ex write command
1802 (defun ex-write (q-flag)
1803   (vip-default-ex-addresses t)
1804   (vip-get-ex-file)
1805   (let ((end (car ex-addresses)) (beg (car (cdr ex-addresses)))
1806         temp-buf writing-same-file region
1807         file-exists writing-whole-file)
1808     (if (> beg end) (error vip-FirstAddrExceedsSecond))
1809     (if ex-cmdfile
1810         (progn
1811           (vip-enlarge-region beg end)
1812           (shell-command-on-region (point) (mark t) ex-file))
1813       (if (and (string= ex-file "") (not (buffer-file-name)))
1814           (setq ex-file
1815                 (read-file-name
1816                  (format "Buffer %s isn't visiting any file. File to save in: "
1817                          (buffer-name)))))
1818
1819       (setq writing-whole-file (and (= (point-min) beg) (= (point-max) end))
1820             ex-file (if (string= ex-file "")
1821                         (buffer-file-name)
1822                       (expand-file-name ex-file)))
1823       ;; if ex-file is a directory use the file portion of the buffer file name
1824       (if (and (file-directory-p ex-file)
1825                buffer-file-name
1826                (not (file-directory-p buffer-file-name)))
1827           (setq ex-file
1828                 (concat ex-file (file-name-nondirectory buffer-file-name))))
1829
1830       (setq file-exists (file-exists-p ex-file)
1831             writing-same-file (string= ex-file (buffer-file-name)))
1832
1833       (if (and writing-whole-file writing-same-file)
1834           (if (not (buffer-modified-p))
1835               (message "(No changes need to be saved)")
1836             (save-buffer)
1837             (ex-write-info file-exists ex-file beg end))
1838         ;; writing some other file or portion of the currents
1839         ;; file---create temp buffer for it
1840         ;; disable undo in that buffer, for efficiency
1841         (buffer-disable-undo (setq temp-buf (create-file-buffer ex-file)))
1842         (unwind-protect
1843             (save-excursion
1844               (if (and file-exists
1845                        (not writing-same-file)
1846                        (not (yes-or-no-p
1847                              (format "File %s exists. Overwrite? " ex-file))))
1848                   (error "Quit")
1849                 (vip-enlarge-region beg end)
1850                 (setq region (buffer-substring (point) (mark t)))
1851                 (set-buffer temp-buf)
1852                 (set-visited-file-name ex-file)
1853                 (erase-buffer)
1854                 (if (and file-exists ex-append)
1855                     (insert-file-contents ex-file))
1856                 (goto-char (point-max))
1857                 (insert region)
1858                 (save-buffer)
1859                 (ex-write-info file-exists ex-file (point-min) (point-max))
1860                 )
1861               (set-buffer temp-buf)
1862               (set-buffer-modified-p nil)
1863               (kill-buffer temp-buf)
1864               ))
1865         )
1866       ;; this prevents the loss of data if writing part of the buffer
1867       (if (and (buffer-file-name) writing-same-file)
1868           (set-visited-file-modtime))
1869       (or writing-whole-file
1870           (not writing-same-file)
1871           (set-buffer-modified-p t))
1872       (if q-flag
1873           (if (< vip-expert-level 2)
1874               (save-buffers-kill-emacs)
1875             (kill-buffer (current-buffer))))
1876       )))
1877
1878
1879 (defun ex-write-info (exists file-name beg end)
1880   (message "`%s'%s %d lines, %d characters"
1881            (abbreviate-file-name file-name)
1882            (if exists "" " [New file]")
1883            (count-lines beg (min (1+ end) (point-max)))
1884            (- end beg)))
1885
1886 ;; Ex yank command
1887 (defun ex-yank ()
1888   (vip-default-ex-addresses)
1889   (vip-get-ex-buffer)
1890   (let ((end (car ex-addresses)) (beg (car (cdr ex-addresses))))
1891     (if (> beg end) (error vip-FirstAddrExceedsSecond))
1892     (save-excursion
1893       (vip-enlarge-region beg end)
1894       (exchange-point-and-mark)
1895       (if (or ex-g-flag ex-g-variant)
1896           (error "Can't execute `yank' within `global'"))
1897       (if ex-count
1898           (progn
1899             (set-mark (point))
1900             (forward-line (1- ex-count)))
1901         (set-mark end))
1902       (vip-enlarge-region (point) (mark t))
1903       (if ex-flag (error "`yank': %s" vip-SpuriousText))
1904       (if ex-buffer
1905           (cond ((vip-valid-register ex-buffer '(Letter))
1906                  (vip-append-to-register
1907                   (downcase ex-buffer) (point) (mark t)))
1908                 ((vip-valid-register ex-buffer)
1909                  (copy-to-register ex-buffer (point) (mark t) nil))
1910                 (t (error vip-InvalidRegister ex-buffer))))
1911       (copy-region-as-kill (point) (mark t)))))
1912
1913 ;; Execute shell command
1914 (defun ex-command ()
1915   (let (command)
1916     (save-window-excursion
1917       (set-buffer vip-ex-work-buf)
1918       (skip-chars-forward " \t")
1919       (setq command (buffer-substring (point) (point-max)))
1920       (end-of-line))
1921     (setq command (ex-expand-filsyms command (current-buffer)))
1922     (if (and (> (length command) 0) (string= "!" (substring command 0 1)))
1923         (if vip-ex-last-shell-com
1924             (setq command (concat vip-ex-last-shell-com (substring command 1)))
1925           (error "No previous shell command")))
1926     (setq vip-ex-last-shell-com command)
1927     (if (null ex-addresses)
1928         (shell-command command)
1929       (let ((end (car ex-addresses)) (beg (car (cdr ex-addresses))))
1930         (if (null beg) (setq beg end))
1931         (save-excursion
1932           (goto-char beg)
1933           (set-mark end)
1934           (vip-enlarge-region (point) (mark t))
1935           (shell-command-on-region (point) (mark t) command t))
1936         (goto-char beg)))))
1937
1938 ;; Print line number
1939 (defun ex-line-no ()
1940   (message "%d"
1941            (1+ (count-lines
1942                 (point-min)
1943                 (if (null ex-addresses) (point-max) (car ex-addresses))))))
1944
1945 ;; Give information on the file visited by the current buffer
1946 (defun vip-info-on-file ()
1947   (interactive)
1948   (let ((pos1 (vip-line-pos 'start))
1949         (pos2 (vip-line-pos 'end))
1950         lines file info)
1951     (setq lines (count-lines (point-min) (vip-line-pos 'end))
1952           file (if (buffer-file-name)
1953                    (concat (abbreviate-file-name (buffer-file-name)) ":")
1954                  (concat (buffer-name) " [Not visiting any file]:"))
1955           info (format "line=%d/%d pos=%d/%d col=%d %s"
1956                        (if (= pos1 pos2)
1957                            (1+ lines)
1958                          lines)
1959                        (count-lines (point-min) (point-max))
1960                        (point) (1- (point-max))
1961                        (1+ (current-column))
1962                        (if (buffer-modified-p) "[Modified]" "[Unchanged]")))
1963     (if (< (+ 1 (length info) (length file))
1964            (window-width (minibuffer-window)))
1965         (message (concat file " " info))
1966       (save-window-excursion
1967         (with-output-to-temp-buffer " *vip-info*"
1968           (princ (concat "\n"
1969                          file "\n\n\t" info
1970                          "\n\n\nPress any key to continue...\n\n")))
1971         (vip-read-event)
1972         (kill-buffer " *vip-info*")))
1973     ))
1974
1975
1976 (provide 'viper-ex)
1977
1978 ;;;  viper-ex.el ends here