lisp/emulation/viper-ex.el

   1 ;;; viper-ex.el --- functions implementing the Ex commands for Viper
   2
   3 ;; Copyright (C) 1994, 1995, 1996, 1997 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 ;; Code
  23
  24 (provide 'viper-ex)
  25
  26 ;; Compiler pacifier
  27 (defvar read-file-name-map)
  28 (defvar vip-use-register)
  29 (defvar vip-s-string)
  30 (defvar vip-shift-width)
  31 (defvar vip-ex-history)
  32 (defvar vip-related-files-and-buffers-ring)
  33 (defvar vip-local-search-start-marker)
  34 (defvar vip-expert-level)
  35 (defvar vip-custom-file-name)
  36 (defvar vip-case-fold-search)
  37
  38 ;; loading happens only in non-interactive compilation
  39 ;; in order to spare non-viperized emacs from being viperized
  40 (if noninteractive
  41     (eval-when-compile
  42       (let ((load-path (cons (expand-file-name ".") load-path)))
  43         (or (featurep 'viper-util)
  44             (load "viper-util.el" nil nil 'nosuffix))
  45         (or (featurep 'viper-keym)
  46             (load "viper-keym.el" nil nil 'nosuffix))
  47         (or (featurep 'viper-cmd)
  48             (load "viper-cmd.el" nil nil 'nosuffix))
  49         )))
  50 ;; end pacifier
  51
  52 (require 'viper-util)
  53
  54
  55 ;;; Variables
  56
  57 (defconst vip-ex-work-buf-name " *ex-working-space*")
  58 (defconst vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
  59 (defconst vip-ex-tmp-buf-name " *ex-tmp*")
  60
  61
  62 ;;; Variable completion in :set command
  63
  64 ;; The list of Ex commands. Used for completing command names.
  65 (defconst ex-token-alist
  66   '(("!") ("=") (">") ("&") ("~")
  67     ("yank") ("xit") ("WWrite") ("Write") ("write") ("wq") ("visual")
  68     ("version") ("vglobal") ("unmap") ("undo") ("tag") ("transfer") ("suspend")
  69     ("substitute") ("submitReport") ("stop")  ("sr") ("source") ("shell")
  70     ("set") ("rewind") ("recover") ("read") ("quit") ("pwd")
  71     ("put") ("preserve") ("PreviousRelatedFile") ("RelatedFile")
  72     ("next") ("Next") ("move") ("mark") ("map") ("kmark") ("join")
  73     ("help") ("goto") ("global") ("file") ("edit") ("delete") ("copy")
  74     ("chdir") ("cd") ("Buffer") ("buffer") ("args"))  )
  75
  76 ;; A-list of Ex variables that can be set using the :set command.
  77 (defconst ex-variable-alist
  78   '(("wrapscan") ("ws") ("wrapmargin") ("wm")
  79     ("global-tabstop") ("gts") ("tabstop") ("ts")
  80     ("showmatch") ("sm") ("shiftwidth") ("sw") ("shell") ("sh")
  81     ("readonly") ("ro")
  82     ("nowrapscan") ("nows") ("noshowmatch") ("nosm")
  83     ("noreadonly") ("noro") ("nomagic") ("noma")
  84     ("noignorecase") ("noic")
  85     ("global-noautoindent") ("gnoai") ("noautoindent") ("noai")
  86     ("magic") ("ma") ("ignorecase") ("ic")
  87     ("global-autoindent") ("gai") ("autoindent") ("ai")
  88     ))
  89
  90
  91
  92 ;; Token recognized during parsing of Ex commands (e.g., "read", "comma")
  93 (defvar ex-token nil)
  94
  95 ;; Type of token.
  96 ;; If non-nil, gives type of address; if nil, it is a command.
  97 (defvar ex-token-type nil)
  98
  99 ;; List of addresses passed to Ex command
 100 (defvar ex-addresses nil)
 101
 102 ;; It seems that this flag is used only for `#', `print', and `list', which
 103 ;; aren't implemented. Check later.
 104 (defvar ex-flag nil)
 105
 106 ;; "buffer" where Ex commands keep deleted data.
 107 ;; In Emacs terms, this is a register.
 108 (defvar ex-buffer nil)
 109
 110 ;; Value of ex count.
 111 (defvar ex-count nil)
 112
 113 ;; Flag for global command.
 114 (defvar ex-g-flag nil)
 115
 116 ;; If t, global command is executed on lines not matching ex-g-pat.
 117 (defvar ex-g-variant nil)
 118
 119 ;; Save reg-exp used in substitute.
 120 (defvar ex-reg-exp nil)
 121
 122
 123 ;; Replace pattern for substitute.
 124 (defvar ex-repl nil)
 125
 126 ;; Pattern for global command.
 127 (defvar ex-g-pat nil)
 128
 129
 130 (defvar ex-unix-type-shell
 131   (let ((case-fold-search t))
 132     (and (stringp shell-file-name)
 133          (string-match
 134           (concat
 135            "\\("
 136            "csh$\\|csh.exe$"
 137            "\\|"
 138            "ksh$\\|ksh.exe$"
 139            "\\|"
 140            "^sh$\\|sh.exe$"
 141            "\\|"
 142            "[^a-z]sh$\\|[^a-z]sh.exe$"
 143            "\\|"
 144            "bash$\\|bash.exe$"
 145            "\\)")
 146           shell-file-name)))
 147   "Is the user using a unix-type shell?")
 148
 149 (defvar ex-unix-type-shell-options
 150   (let ((case-fold-search t))
 151     (if ex-unix-type-shell
 152         (cond ((string-match "\\(csh$\\|csh.exe$\\)" shell-file-name)
 153                "-f") ; csh: do it fast
 154               ((string-match "\\(bash$\\|bash.exe$\\)" shell-file-name)
 155                "-noprofile") ; bash: ignore .profile
 156               )))
 157   "Options to pass to the Unix-style shell.
 158 Don't put `-c' here, as it is added automatically.")
 159
 160 (defvar ex-nontrivial-find-file-function
 161   (cond (ex-unix-type-shell 'vip-ex-nontrivial-find-file-unix)
 162         ((eq system-type 'emx) 'vip-ex-nontrivial-find-file-ms) ; OS/2
 163         (vip-ms-style-os-p 'vip-ex-nontrivial-find-file-ms) ; a Microsoft OS
 164         (vip-vms-os-p 'vip-ex-nontrivial-find-file-unix) ; VMS
 165         (t  'vip-ex-nontrivial-find-file-unix) ; presumably UNIX
 166         ))
 167
 168 ;; Remembers the previous Ex tag.
 169 (defvar ex-tag nil)
 170
 171 ;; file used by Ex commands like :r, :w, :n
 172 (defvar ex-file nil)
 173
 174 ;; If t, tells Ex that this is a variant-command, i.e., w>>, r!, etc.
 175 (defvar ex-variant nil)
 176
 177 ;; Specified the offset of an Ex command, such as :read.
 178 (defvar ex-offset nil)
 179
 180 ;; Tells Ex that this is a w>> command.
 181 (defvar ex-append nil)
 182
 183 ;; File containing the shell command to be executed at Ex prompt,
 184 ;; e.g., :r !date
 185 (defvar ex-cmdfile nil)
 186
 187 ;; flag used in vip-ex-read-file-name to indicate that we may be reading
 188 ;; multiple file names. Used for :edit and :next
 189 (defvar vip-keep-reading-filename nil)
 190
 191 (defconst ex-cycle-other-window t
 192   "*If t, :n and :b cycles through files and buffers in other window.
 193 Then :N and :B cycles in the current window. If nil, this behavior is
 194 reversed.")
 195
 196 (defconst ex-cycle-through-non-files nil
 197   "*Cycle through *scratch* and other buffers that don't visit any file.")
 198
 199 ;; Last shell command executed with :! command.
 200 (defvar vip-ex-last-shell-com nil)
 201
 202 ;; Indicates if Minibuffer was exited temporarily in Ex-command.
 203 (defvar vip-incomplete-ex-cmd nil)
 204
 205 ;; Remembers the last ex-command prompt.
 206 (defvar vip-last-ex-prompt "")
 207
 208
 209 ;;; Code
 210
 211 ;; Check if ex-token is an initial segment of STR
 212 (defun vip-check-sub (str)
 213   (let ((length (length ex-token)))
 214     (if (and (<= length (length str))
 215              (string= ex-token (substring str 0 length)))
 216         (setq ex-token str)
 217       (setq ex-token-type 'non-command))))
 218
 219 ;; Get a complete ex command
 220 (defun vip-get-ex-com-subr ()
 221   (let (case-fold-search)
 222     (set-mark (point))
 223     (re-search-forward "[a-zA-Z][a-zA-Z]*")
 224     (setq ex-token-type 'command)
 225     (setq ex-token (buffer-substring (point) (mark t)))
 226     (exchange-point-and-mark)
 227     (cond ((looking-at "a")
 228            (cond ((looking-at "ab") (vip-check-sub "abbreviate"))
 229                  ((looking-at "ar") (vip-check-sub "args"))
 230                  (t (vip-check-sub "append"))))
 231           ((looking-at "h") (vip-check-sub "help"))
 232           ((looking-at "c")
 233            (cond ((looking-at "cd") (vip-check-sub "cd"))
 234                  ((looking-at "ch") (vip-check-sub "chdir"))
 235                  ((looking-at "co") (vip-check-sub "copy"))
 236                  (t (vip-check-sub "change"))))
 237           ((looking-at "d") (vip-check-sub "delete"))
 238           ((looking-at "b") (vip-check-sub "buffer"))
 239           ((looking-at "B") (vip-check-sub "Buffer"))
 240           ((looking-at "e")
 241            (if (looking-at "ex") (vip-check-sub "ex")
 242              (vip-check-sub "edit")))
 243           ((looking-at "f") (vip-check-sub "file"))
 244           ((looking-at "g") (vip-check-sub "global"))
 245           ((looking-at "i") (vip-check-sub "insert"))
 246           ((looking-at "j") (vip-check-sub "join"))
 247           ((looking-at "l") (vip-check-sub "list"))
 248           ((looking-at "m")
 249            (cond ((looking-at "map") (vip-check-sub "map"))
 250                  ((looking-at "mar") (vip-check-sub "mark"))
 251                  (t (vip-check-sub "move"))))
 252           ((looking-at "k[a-z][^a-z]")
 253            (setq ex-token "kmark")
 254            (forward-char 1)
 255            (exchange-point-and-mark))   ; this is canceled out by another
 256                                         ; exchange-point-and-mark at the end
 257           ((looking-at "k") (vip-check-sub "kmark"))
 258           ((looking-at "n") (if (looking-at "nu")
 259                                 (vip-check-sub "number")
 260                               (vip-check-sub "next")))
 261           ((looking-at "N") (vip-check-sub "Next"))
 262           ((looking-at "o") (vip-check-sub "open"))
 263           ((looking-at "p")
 264            (cond ((looking-at "pre") (vip-check-sub "preserve"))
 265                  ((looking-at "pu") (vip-check-sub "put"))
 266                  ((looking-at "pw") (vip-check-sub "pwd"))
 267                  (t (vip-check-sub "print"))))
 268           ((looking-at "P") (vip-check-sub "PreviousRelatedFile"))
 269           ((looking-at "R") (vip-check-sub "RelatedFile"))
 270           ((looking-at "q") (vip-check-sub "quit"))
 271           ((looking-at "r")
 272            (cond ((looking-at "rec") (vip-check-sub "recover"))
 273                  ((looking-at "rew") (vip-check-sub "rewind"))
 274                  (t (vip-check-sub "read"))))
 275           ((looking-at "s")
 276            (cond ((looking-at "se") (vip-check-sub "set"))
 277                  ((looking-at "sh") (vip-check-sub "shell"))
 278                  ((looking-at "so") (vip-check-sub "source"))
 279                  ((looking-at "sr") (vip-check-sub "sr"))
 280                  ((looking-at "st") (vip-check-sub "stop"))
 281                  ((looking-at "sus") (vip-check-sub "suspend"))
 282                  ((looking-at "subm") (vip-check-sub "submitReport"))
 283                  (t (vip-check-sub "substitute"))))
 284           ((looking-at "t")
 285            (if (looking-at "ta") (vip-check-sub "tag")
 286              (vip-check-sub "transfer")))
 287           ((looking-at "u")
 288            (cond ((looking-at "una") (vip-check-sub "unabbreviate"))
 289                  ((looking-at "unm") (vip-check-sub "unmap"))
 290                  (t (vip-check-sub "undo"))))
 291           ((looking-at "v")
 292            (cond ((looking-at "ve") (vip-check-sub "version"))
 293                  ((looking-at "vi") (vip-check-sub "visual"))
 294                  (t (vip-check-sub "vglobal"))))
 295           ((looking-at "w")
 296            (if (looking-at "wq") (vip-check-sub "wq")
 297              (vip-check-sub "write")))
 298           ((looking-at "W")
 299            (if (looking-at "WW")
 300                (vip-check-sub "WWrite")
 301              (vip-check-sub "Write")))
 302           ((looking-at "x") (vip-check-sub "xit"))
 303           ((looking-at "y") (vip-check-sub "yank"))
 304           ((looking-at "z") (vip-check-sub "z")))
 305     (exchange-point-and-mark)
 306     ))
 307
 308 ;; Get an ex-token which is either an address or a command.
 309 ;; A token has a type, \(command, address, end-mark\), and a value
 310 (defun vip-get-ex-token ()
 311   (save-window-excursion
 312     (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
 313     (set-buffer vip-ex-work-buf)
 314     (skip-chars-forward " \t|")
 315     (cond ((looking-at "#")
 316            (setq ex-token-type 'command)
 317            (setq ex-token (char-to-string (following-char)))
 318            (forward-char 1))
 319           ((looking-at "[a-z]") (vip-get-ex-com-subr))
 320           ((looking-at "\\.")
 321            (forward-char 1)
 322            (setq ex-token-type 'dot))
 323           ((looking-at "[0-9]")
 324            (set-mark (point))
 325            (re-search-forward "[0-9]*")
 326            (setq ex-token-type
 327                  (cond ((eq ex-token-type 'plus) 'add-number)
 328                        ((eq ex-token-type 'minus) 'sub-number)
 329                        (t 'abs-number)))
 330            (setq ex-token (string-to-int (buffer-substring (point) (mark t)))))
 331           ((looking-at "\\$")
 332            (forward-char 1)
 333            (setq ex-token-type 'end))
 334           ((looking-at "%")
 335            (forward-char 1)
 336            (setq ex-token-type 'whole))
 337           ((looking-at "+")
 338            (cond ((or (looking-at "+[-+]") (looking-at "+[\n|]"))
 339                   (forward-char 1)
 340                   (insert "1")
 341                   (backward-char 1)
 342                   (setq ex-token-type 'plus))
 343                  ((looking-at "+[0-9]")
 344                   (forward-char 1)
 345                   (setq ex-token-type 'plus))
 346                  (t
 347                   (error vip-BadAddress))))
 348           ((looking-at "-")
 349            (cond ((or (looking-at "-[-+]") (looking-at "-[\n|]"))
 350                   (forward-char 1)
 351                   (insert "1")
 352                   (backward-char 1)
 353                   (setq ex-token-type 'minus))
 354                  ((looking-at "-[0-9]")
 355                   (forward-char 1)
 356                   (setq ex-token-type 'minus))
 357                  (t
 358                   (error vip-BadAddress))))
 359           ((looking-at "/")
 360            (forward-char 1)
 361            (set-mark (point))
 362            (let ((cont t))
 363              (while (and (not (eolp)) cont)
 364                ;;(re-search-forward "[^/]*/")
 365                (re-search-forward "[^/]*\\(/\\|\n\\)")
 366                (if (not (vip-looking-back "[^\\\\]\\(\\\\\\\\\\)*\\\\/"))
 367                    (setq cont nil))))
 368            (backward-char 1)
 369            (setq ex-token (buffer-substring (point) (mark t)))
 370            (if (looking-at "/") (forward-char 1))
 371            (setq ex-token-type 'search-forward))
 372           ((looking-at "\\?")
 373            (forward-char 1)
 374            (set-mark (point))
 375            (let ((cont t))
 376              (while (and (not (eolp)) cont)
 377                ;;(re-search-forward "[^\\?]*\\?")
 378                (re-search-forward "[^\\?]*\\(\\?\\|\n\\)")
 379                (if (not (vip-looking-back "[^\\\\]\\(\\\\\\\\\\)*\\\\\\?"))
 380                    (setq cont nil))
 381                (backward-char 1)
 382                (if (not (looking-at "\n")) (forward-char 1))))
 383            (setq ex-token-type 'search-backward)
 384            (setq ex-token (buffer-substring (1- (point)) (mark t))))
 385           ((looking-at ",")
 386            (forward-char 1)
 387            (setq ex-token-type 'comma))
 388           ((looking-at ";")
 389            (forward-char 1)
 390            (setq ex-token-type 'semi-colon))
 391           ((looking-at "[!=><&~]")
 392            (setq ex-token-type 'command)
 393            (setq ex-token (char-to-string (following-char)))
 394            (forward-char 1))
 395           ((looking-at "'")
 396            (setq ex-token-type 'goto-mark)
 397            (forward-char 1)
 398            (cond ((looking-at "'") (setq ex-token nil))
 399                  ((looking-at "[a-z]") (setq ex-token (following-char)))
 400                  (t (error "Marks are ' and a-z")))
 401            (forward-char 1))
 402           ((looking-at "\n")
 403            (setq ex-token-type 'end-mark)
 404            (setq ex-token "goto"))
 405           (t
 406            (error vip-BadExCommand)))))
 407
 408 ;; Reads Ex command. Tries to determine if it has to exit because command
 409 ;; is complete or invalid. If not, keeps reading command.
 410 (defun ex-cmd-read-exit ()
 411   (interactive)
 412   (setq vip-incomplete-ex-cmd t)
 413   (let ((quit-regex1 (concat
 414                       "\\(" "set[ \t]*"
 415                       "\\|" "edit[ \t]*"
 416                       "\\|" "[nN]ext[ \t]*"
 417                       "\\|" "unm[ \t]*"
 418                       "\\|" "^[ \t]*rep"
 419                       "\\)"))
 420         (quit-regex2 (concat
 421                       "[a-zA-Z][ \t]*"
 422                       "\\(" "!" "\\|" ">>"
 423                       "\\|" "\\+[0-9]+"
 424                       "\\)"
 425                       "*[ \t]*$"))
 426         (stay-regex (concat
 427                      "\\(" "^[ \t]*$"
 428                      "\\|" "[?/].*[?/].*"
 429                      "\\|" "[ktgjmsz][ \t]*$"
 430                      "\\|" "^[ \t]*ab.*"
 431                      "\\|" "tr[ansfer \t]*"
 432                      "\\|" "sr[ \t]*"
 433                      "\\|" "mo.*"
 434                      "\\|" "^[ \t]*k?ma[^p]*"
 435                      "\\|" "^[ \t]*fi.*"
 436                      "\\|" "v?gl.*"
 437                      "\\|" "[vg][ \t]*$"
 438                      "\\|" "jo.*"
 439                      "\\|" "^[ \t]*ta.*"
 440                      "\\|" "^[ \t]*una.*"
 441                      "\\|" "^[ \t]*su.*"
 442                      "\\|['`][a-z][ \t]*"
 443                      "\\|" "![ \t]*[a-zA-Z].*"
 444                      "\\)"
 445                      "!*")))
 446
 447     (save-window-excursion ;; put cursor at the end of the Ex working buffer
 448       (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
 449       (set-buffer vip-ex-work-buf)
 450       (goto-char (point-max)))
 451     (cond ((vip-looking-back quit-regex1) (exit-minibuffer))
 452           ((vip-looking-back stay-regex)  (insert " "))
 453           ((vip-looking-back quit-regex2) (exit-minibuffer))
 454           (t (insert " ")))))
 455
 456 ;; complete Ex command
 457 (defun ex-cmd-complete ()
 458   (interactive)
 459   (let (save-pos dist compl-list string-to-complete completion-result)
 460
 461     (save-excursion
 462       (setq dist (skip-chars-backward "[a-zA-Z!=>&~]")
 463             save-pos (point)))
 464
 465     (if (or (= dist 0)
 466             (vip-looking-back "\\([ \t]*['`][ \t]*[a-z]*\\)")
 467             (vip-looking-back
 468              "^[ \t]*[a-zA-Z!=>&~][ \t]*[/?]*+[ \t]+[a-zA-Z!=>&~]+"))
 469         ;; Preceding characters are not the ones allowed in an Ex command
 470         ;; or we have typed past command name.
 471         ;; Note: we didn't do parsing, so there may be surprises.
 472         (if (or (vip-looking-back "[a-zA-Z!=>&~][ \t]*[/?]*[ \t]*")
 473                 (vip-looking-back "\\([ \t]*['`][ \t]*[a-z]*\\)")
 474                 (looking-at "[^ \t\n\C-m]"))
 475             nil
 476           (with-output-to-temp-buffer "*Completions*"
 477             (display-completion-list
 478              (vip-alist-to-list ex-token-alist))))
 479       ;; Preceding chars may be part of a command name
 480       (setq string-to-complete (buffer-substring save-pos (point)))
 481       (setq completion-result
 482             (try-completion string-to-complete ex-token-alist))
 483
 484       (cond ((eq completion-result t)  ; exact match--do nothing
 485              (vip-tmp-insert-at-eob " (Sole completion)"))
 486             ((eq completion-result nil)
 487              (vip-tmp-insert-at-eob " (No match)"))
 488             (t  ;; partial completion
 489              (goto-char save-pos)
 490              (delete-region (point) (point-max))
 491              (insert completion-result)
 492              (let (case-fold-search)
 493                (setq compl-list
 494                      (vip-filter-alist (concat "^" completion-result)
 495                                        ex-token-alist)))
 496              (if (> (length compl-list) 1)
 497                  (with-output-to-temp-buffer "*Completions*"
 498                    (display-completion-list
 499                     (vip-alist-to-list (reverse compl-list)))))))
 500       )))
 501
 502
 503 ;; Read Ex commands
 504 ;; Ex commands themselves are implemented in viper-ex.el
 505 (defun vip-ex (&optional string)
 506   (interactive)
 507   (or string
 508       (setq ex-g-flag nil
 509             ex-g-variant nil))
 510   (let* ((map (copy-keymap minibuffer-local-map))
 511          (address nil)
 512          (cont t)
 513          (dot (point))
 514          prev-token-type com-str)
 515
 516     (vip-add-keymap vip-ex-cmd-map map)
 517
 518     (setq com-str (or string (vip-read-string-with-history
 519                               ":"
 520                               nil
 521                               'vip-ex-history
 522                               (car vip-ex-history)
 523                               map)))
 524     (save-window-excursion
 525       ;; just a precaution
 526       (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
 527       (set-buffer vip-ex-work-buf)
 528       (delete-region (point-min) (point-max))
 529       (insert com-str "\n")
 530       (goto-char (point-min)))
 531     (setq ex-token-type nil
 532           ex-addresses nil)
 533     (while cont
 534       (vip-get-ex-token)
 535       (cond ((memq ex-token-type '(command end-mark))
 536              (if address (setq ex-addresses (cons address ex-addresses)))
 537              (cond ((string= ex-token "global")
 538                     (ex-global nil)
 539                     (setq cont nil))
 540                    ((string= ex-token "vglobal")
 541                     (ex-global t)
 542                     (setq cont nil))
 543                    (t
 544                     (vip-execute-ex-command)
 545                     (save-window-excursion
 546                       (setq vip-ex-work-buf
 547                             (get-buffer-create vip-ex-work-buf-name))
 548                       (set-buffer vip-ex-work-buf)
 549                       (skip-chars-forward " \t")
 550                       (cond ((looking-at "|")
 551                              (forward-char 1))
 552                             ((looking-at "\n")
 553                              (setq cont nil))
 554                             (t (error "`%s': %s" ex-token vip-SpuriousText)))
 555                       ))
 556                    ))
 557             ((eq ex-token-type 'non-command)
 558              (error "`%s': %s" ex-token vip-BadExCommand))
 559             ((eq ex-token-type 'whole)
 560              (setq address nil)
 561              (setq ex-addresses
 562                    (if ex-addresses
 563                        (cons (point-max) ex-addresses)
 564                      (cons (point-max) (cons (point-min) ex-addresses)))))
 565             ((eq ex-token-type 'comma)
 566              (if (eq prev-token-type 'whole)
 567                  (setq address (point-min)))
 568              (setq ex-addresses
 569                    (cons (if (null address) (point) address) ex-addresses)))
 570             ((eq ex-token-type 'semi-colon)
 571              (if (eq prev-token-type 'whole)
 572                  (setq address (point-min)))
 573              (if address (setq dot address))
 574              (setq ex-addresses
 575                    (cons (if (null address) (point) address) ex-addresses)))
 576             (t (let ((ans (vip-get-ex-address-subr address dot)))
 577                  (if ans (setq address ans)))))
 578       (setq prev-token-type ex-token-type))))
 579
 580
 581 ;; Get a regular expression and set `ex-variant', if found
 582 (defun vip-get-ex-pat ()
 583   (save-window-excursion
 584     (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
 585     (set-buffer vip-ex-work-buf)
 586     (skip-chars-forward " \t")
 587     (if (looking-at "!")
 588         (progn
 589           (setq ex-g-variant (not ex-g-variant)
 590                 ex-g-flag (not ex-g-flag))
 591           (forward-char 1)
 592           (skip-chars-forward " \t")))
 593     (let ((c (following-char)))
 594       (if (string-match "[0-9A-Za-z]" (format "%c" c))
 595           (error
 596            "Global regexp must be inside matching non-alphanumeric chars"))
 597       (if (looking-at "[^\\\\\n]")
 598           (progn
 599             (forward-char 1)
 600             (set-mark (point))
 601             (let ((cont t))
 602               (while (and (not (eolp)) cont)
 603                 (if (not (re-search-forward (format "[^%c]*%c" c c) nil t))
 604                     (if (member ex-token '("global" "vglobal"))
 605                         (error
 606                          "Missing closing delimiter for global regexp")
 607                       (goto-char (point-max))))
 608                 (if (not (vip-looking-back
 609                           (format "[^\\\\]\\(\\\\\\\\\\)*\\\\%c" c)))
 610                     (setq cont nil))))
 611             (setq ex-token
 612                   (if (= (mark t) (point)) ""
 613                     (buffer-substring (1- (point)) (mark t))))
 614             (backward-char 1))
 615         (setq ex-token nil))
 616       c)))
 617
 618 ;; get an ex command
 619 (defun vip-get-ex-command ()
 620   (save-window-excursion
 621     (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
 622     (set-buffer vip-ex-work-buf)
 623     (if (looking-at "/") (forward-char 1))
 624     (skip-chars-forward " \t")
 625     (cond ((looking-at "[a-z]")
 626            (vip-get-ex-com-subr)
 627            (if (eq ex-token-type 'non-command)
 628                (error "`%s': %s" ex-token vip-BadExCommand)))
 629           ((looking-at "[!=><&~]")
 630            (setq ex-token (char-to-string (following-char)))
 631            (forward-char 1))
 632           (t (error vip-BadExCommand)))))
 633
 634 ;; Get an Ex option g or c
 635 (defun vip-get-ex-opt-gc (c)
 636   (save-window-excursion
 637     (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
 638     (set-buffer vip-ex-work-buf)
 639     (if (looking-at (format "%c" c)) (forward-char 1))
 640     (skip-chars-forward " \t")
 641     (cond ((looking-at "g")
 642            (setq ex-token "g")
 643            (forward-char 1)
 644            t)
 645           ((looking-at "c")
 646            (setq ex-token "c")
 647            (forward-char 1)
 648            t)
 649           (t nil))))
 650
 651 ;; Compute default addresses.  WHOLE-FLAG means use the whole buffer
 652 (defun vip-default-ex-addresses (&optional whole-flag)
 653   (cond ((null ex-addresses)
 654          (setq ex-addresses
 655                (if whole-flag
 656                    (cons (point-max) (cons (point-min) nil))
 657                  (cons (point) (cons (point) nil)))))
 658         ((null (cdr ex-addresses))
 659          (setq ex-addresses
 660                (cons (car ex-addresses) ex-addresses)))))
 661
 662 ;; Get an ex-address as a marker and set ex-flag if a flag is found
 663 (defun vip-get-ex-address ()
 664   (let ((address (point-marker))
 665         (cont t))
 666     (setq ex-token "")
 667     (setq ex-flag nil)
 668     (while cont
 669       (vip-get-ex-token)
 670       (cond ((eq ex-token-type 'command)
 671              (if (member ex-token '("print" "list" "#"))
 672                  (progn
 673                    (setq ex-flag t
 674                          cont nil))
 675                (error "Address expected in this Ex command")))
 676             ((eq ex-token-type 'end-mark)
 677              (setq cont nil))
 678             ((eq ex-token-type 'whole)
 679              (error "Trailing address expected"))
 680             ((eq ex-token-type 'comma)
 681              (error "`%s': %s" ex-token vip-SpuriousText))
 682             (t (let ((ans (vip-get-ex-address-subr address (point-marker))))
 683                  (if ans (setq address ans))))))
 684     address))
 685
 686 ;; Returns an address as a point
 687 (defun vip-get-ex-address-subr (old-address dot)
 688   (let ((address nil))
 689     (if (null old-address) (setq old-address dot))
 690     (cond ((eq ex-token-type 'dot)
 691            (setq address dot))
 692           ((eq ex-token-type 'add-number)
 693            (save-excursion
 694              (goto-char old-address)
 695              (forward-line (if (= old-address 0) (1- ex-token) ex-token))
 696              (setq address (point-marker))))
 697           ((eq ex-token-type 'sub-number)
 698            (save-excursion
 699              (goto-char old-address)
 700              (forward-line (- ex-token))
 701              (setq address (point-marker))))
 702           ((eq ex-token-type 'abs-number)
 703            (save-excursion
 704              (goto-char (point-min))
 705              (if (= ex-token 0) (setq address 0)
 706                (forward-line (1- ex-token))
 707                (setq address (point-marker)))))
 708           ((eq ex-token-type 'end)
 709            (setq address (point-max-marker)))
 710           ((eq ex-token-type 'plus) t)  ; do nothing
 711           ((eq ex-token-type 'minus) t) ; do nothing
 712           ((eq ex-token-type 'search-forward)
 713            (save-excursion
 714              (ex-search-address t)
 715              (setq address (point-marker))))
 716           ((eq ex-token-type 'search-backward)
 717            (save-excursion
 718              (ex-search-address nil)
 719              (setq address (point-marker))))
 720           ((eq ex-token-type 'goto-mark)
 721            (save-excursion
 722              (if (null ex-token)
 723                  (exchange-point-and-mark)
 724                (goto-char (vip-register-to-point
 725                            (1+ (- ex-token ?a)) 'enforce-buffer)))
 726              (setq address (point-marker)))))
 727     address))
 728
 729
 730 ;; Search pattern and set address
 731 (defun ex-search-address (forward)
 732   (if (string= ex-token "")
 733       (if (null vip-s-string)
 734           (error vip-NoPrevSearch)
 735         (setq ex-token vip-s-string))
 736     (setq vip-s-string ex-token))
 737   (if forward
 738       (progn
 739         (forward-line 1)
 740         (re-search-forward ex-token))
 741     (forward-line -1)
 742     (re-search-backward ex-token)))
 743
 744 ;; Get a buffer name and set `ex-count' and `ex-flag' if found
 745 (defun vip-get-ex-buffer ()
 746   (setq ex-buffer nil)
 747   (setq ex-count nil)
 748   (setq ex-flag nil)
 749   (save-window-excursion
 750     (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
 751     (set-buffer vip-ex-work-buf)
 752     (skip-chars-forward " \t")
 753     (if (looking-at "[a-zA-Z]")
 754         (progn
 755           (setq ex-buffer (following-char))
 756           (forward-char 1)
 757           (skip-chars-forward " \t")))
 758     (if (looking-at "[0-9]")
 759         (progn
 760           (set-mark (point))
 761           (re-search-forward "[0-9][0-9]*")
 762           (setq ex-count (string-to-int (buffer-substring (point) (mark t))))
 763           (skip-chars-forward " \t")))
 764     (if (looking-at "[pl#]")
 765         (progn
 766           (setq ex-flag t)
 767           (forward-char 1)))
 768     (if (not (looking-at "[\n|]"))
 769         (error "`%s': %s" ex-token vip-SpuriousText))))
 770
 771 (defun vip-get-ex-count ()
 772   (setq ex-variant nil
 773         ex-count nil
 774         ex-flag nil)
 775   (save-window-excursion
 776     (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
 777     (set-buffer vip-ex-work-buf)
 778     (skip-chars-forward " \t")
 779     (if (looking-at "!")
 780         (progn
 781           (setq ex-variant t)
 782           (forward-char 1)))
 783     (skip-chars-forward " \t")
 784     (if (looking-at "[0-9]")
 785         (progn
 786           (set-mark (point))
 787           (re-search-forward "[0-9][0-9]*")
 788           (setq ex-count (string-to-int (buffer-substring (point) (mark t))))
 789           (skip-chars-forward " \t")))
 790     (if (looking-at "[pl#]")
 791         (progn
 792           (setq ex-flag t)
 793           (forward-char 1)))
 794     (if (not (looking-at "[\n|]"))
 795         (error "`%s': %s"
 796                (buffer-substring (point-min) (1- (point-max))) vip-BadExCommand))))
 797
 798 ;; Expand \% and \# in ex command
 799 (defun ex-expand-filsyms (cmd buf)
 800   (let (cf pf ret)
 801     (save-excursion
 802       (set-buffer buf)
 803       (setq cf buffer-file-name)
 804       (setq pf (ex-next nil t))) ; this finds alternative file name
 805     (if (and (null cf) (string-match "[^\\]%\\|\\`%" cmd))
 806         (error "No current file to substitute for `%%'"))
 807     (if (and (null pf) (string-match "[^\\]#\\|\\`#" cmd))
 808         (error "No alternate file to substitute for `#'"))
 809     (save-excursion
 810       (set-buffer (get-buffer-create vip-ex-tmp-buf-name))
 811       (erase-buffer)
 812       (insert cmd)
 813       (goto-char (point-min))
 814       (while (re-search-forward "%\\|#" nil t)
 815         (let ((data (match-data))
 816               (char (buffer-substring (match-beginning 0) (match-end 0))))
 817           (if (vip-looking-back (concat "\\\\" char))
 818               (replace-match char)
 819             (store-match-data data)
 820             (if (string= char "%")
 821                 (replace-match cf)
 822               (replace-match pf)))))
 823       (end-of-line)
 824       (setq ret (buffer-substring (point-min) (point)))
 825       (message "%s" ret))
 826     ret))
 827
 828 ;; Get a file name and set ex-variant, `ex-append' and `ex-offset' if found
 829 (defun vip-get-ex-file ()
 830   (let (prompt)
 831     (setq ex-file nil
 832           ex-variant nil
 833           ex-append nil
 834           ex-offset nil
 835           ex-cmdfile nil)
 836     (save-excursion
 837       (save-window-excursion
 838         (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
 839         (set-buffer vip-ex-work-buf)
 840         (skip-chars-forward " \t")
 841         (if (looking-at "!")
 842             (if (and (not (vip-looking-back "[ \t]"))
 843                      ;; read doesn't have a corresponding :r! form, so ! is
 844                      ;; immediately interpreted as a shell command.
 845                      (not (string= ex-token "read")))
 846                 (progn
 847                   (setq ex-variant t)
 848                   (forward-char 1)
 849                   (skip-chars-forward " \t"))
 850               (setq ex-cmdfile t)
 851               (forward-char 1)
 852               (skip-chars-forward " \t")))
 853         (if (looking-at ">>")
 854             (progn
 855               (setq ex-append t
 856                     ex-variant t)
 857               (forward-char 2)
 858               (skip-chars-forward " \t")))
 859         (if (looking-at "+")
 860             (progn
 861               (forward-char 1)
 862               (set-mark (point))
 863               (re-search-forward "[ \t\n]")
 864               (backward-char 1)
 865               (setq ex-offset (buffer-substring (point) (mark t)))
 866               (forward-char 1)
 867               (skip-chars-forward " \t")))
 868         ;; this takes care of :r, :w, etc., when they get file names
 869         ;; from the history list
 870         (if (member ex-token '("read" "write" "edit" "visual" "next"))
 871             (progn
 872               (setq ex-file (buffer-substring (point)  (1- (point-max))))
 873               (setq ex-file
 874                     ;; For :e, match multiple non-white strings separated
 875                     ;; by white. For others, find the first non-white string
 876                     (if (string-match
 877                          (if (string= ex-token "edit")
 878                              "[^ \t\n]+\\([ \t]+[^ \t\n]+\\)*"
 879                            "[^ \t\n]+")
 880                          ex-file)
 881                         (progn
 882                           ;; if file name comes from history, don't leave
 883                           ;; minibuffer when the user types space
 884                           (setq vip-incomplete-ex-cmd nil)
 885                           ;; this must be the last clause in this progn
 886                           (substring ex-file (match-beginning 0) (match-end 0))
 887                           )
 888                       ""))
 889               ;; this leaves only the command name in the work area
 890               ;; file names are gone
 891               (delete-region (point) (1- (point-max)))
 892               ))
 893         (goto-char (point-max))
 894         (skip-chars-backward " \t\n")
 895         (setq prompt (buffer-substring (point-min) (point)))
 896         ))
 897
 898     (setq vip-last-ex-prompt prompt)
 899
 900     ;; If we just finished reading command, redisplay prompt
 901     (if vip-incomplete-ex-cmd
 902         (setq ex-file (vip-ex-read-file-name (format ":%s " prompt)))
 903       ;; file was typed in-line
 904       (setq ex-file (or ex-file "")))
 905     ))
 906
 907
 908 ;; Completes file name or exits minibuffer. If Ex command accepts multiple
 909 ;; file names, arranges to re-enter the minibuffer.
 910 (defun vip-complete-filename-or-exit ()
 911   (interactive)
 912   (setq vip-keep-reading-filename t)
 913   ;; don't exit if directory---ex-commands don't
 914   (cond ((ex-cmd-accepts-multiple-files-p ex-token) (exit-minibuffer))
 915         ;; apparently the argument to an Ex command is
 916         ;; supposed to be a shell command
 917         ((vip-looking-back "^[ \t]*!.*")
 918          (setq ex-cmdfile t)
 919          (insert " "))
 920         (t
 921          (setq ex-cmdfile nil)
 922          (minibuffer-complete-word))))
 923
 924 (defun vip-handle-! ()
 925   (interactive)
 926   (if (and (string=
 927             (buffer-string) (vip-abbreviate-file-name default-directory))
 928            (member ex-token '("read" "write")))
 929       (erase-buffer))
 930   (insert "!"))
 931
 932 (defun ex-cmd-accepts-multiple-files-p (token)
 933   (member token '("edit" "next" "Next")))
 934
 935 ;; If user doesn't enter anything, then "" is returned, i.e., the
 936 ;; prompt-directory is not returned.
 937 (defun vip-ex-read-file-name (prompt)
 938   (let* ((str "")
 939          (minibuffer-local-completion-map
 940           (copy-keymap minibuffer-local-completion-map))
 941          beg end cont val)
 942
 943     (vip-add-keymap ex-read-filename-map
 944                     (if vip-emacs-p
 945                         minibuffer-local-completion-map
 946                       read-file-name-map))
 947
 948     (setq cont (setq vip-keep-reading-filename t))
 949     (while cont
 950       (setq vip-keep-reading-filename nil
 951             val (read-file-name (concat prompt str) nil default-directory))
 952       (if (string-match " " val)
 953           (setq val (concat "\\\"" val "\\\"")))
 954       (setq str  (concat str (if (equal val "") "" " ")
 955                          val (if (equal val "") "" " ")))
 956
 957       ;; Only edit, next, and Next commands accept multiple files.
 958       ;; vip-keep-reading-filename is set in the anonymous function that is
 959       ;; bound to " " in ex-read-filename-map.
 960       (setq cont (and vip-keep-reading-filename
 961                       (ex-cmd-accepts-multiple-files-p ex-token)))
 962       )
 963
 964     (setq beg (string-match "[^ \t]" str)   ; delete leading blanks
 965           end (string-match "[ \t]*$" str)) ; delete trailing blanks
 966     (if (member ex-token '("read" "write"))
 967           (if (string-match "[\t ]*!" str)
 968               ;; this is actually a shell command
 969               (progn
 970                 (setq ex-cmdfile t)
 971                 (setq beg (1+ beg))
 972                 (setq vip-last-ex-prompt (concat vip-last-ex-prompt " !")))))
 973     (substring str (or beg 0) end)))
 974
 975 ;; Execute ex command using the value of addresses
 976 (defun vip-execute-ex-command ()
 977   (vip-deactivate-mark)
 978   (cond ((string= ex-token "args") (ex-args))
 979         ((string= ex-token "copy") (ex-copy nil))
 980         ((string= ex-token "cd") (ex-cd))
 981         ((string= ex-token "chdir") (ex-cd))
 982         ((string= ex-token "delete") (ex-delete))
 983         ((string= ex-token "edit") (ex-edit))
 984         ((string= ex-token "file") (vip-info-on-file))
 985         ((string= ex-token "goto") (ex-goto))
 986         ((string= ex-token "help") (ex-help))
 987         ((string= ex-token "join") (ex-line "join"))
 988         ((string= ex-token "kmark") (ex-mark))
 989         ((string= ex-token "mark") (ex-mark))
 990         ((string= ex-token "map") (ex-map))
 991         ((string= ex-token "move") (ex-copy t))
 992         ((string= ex-token "next") (ex-next ex-cycle-other-window))
 993         ((string= ex-token "Next") (ex-next (not ex-cycle-other-window)))
 994         ((string= ex-token "RelatedFile") (ex-next-related-buffer 1))
 995         ((string= ex-token "put") (ex-put))
 996         ((string= ex-token "pwd") (ex-pwd))
 997         ((string= ex-token "preserve") (ex-preserve))
 998         ((string= ex-token "PreviousRelatedFile") (ex-next-related-buffer -1))
 999         ((string= ex-token "quit") (ex-quit))
1000         ((string= ex-token "read") (ex-read))
1001         ((string= ex-token "recover") (ex-recover))
1002         ((string= ex-token "rewind") (ex-rewind))
1003         ((string= ex-token "submitReport") (vip-submit-report))
1004         ((string= ex-token "set") (ex-set))
1005         ((string= ex-token "shell") (ex-shell))
1006         ((string= ex-token "source") (ex-source))
1007         ((string= ex-token "sr") (ex-substitute t t))
1008         ((string= ex-token "substitute") (ex-substitute))
1009         ((string= ex-token "suspend") (suspend-emacs))
1010         ((string= ex-token "stop") (suspend-emacs))
1011         ((string= ex-token "transfer") (ex-copy nil))
1012         ((string= ex-token "buffer") (if ex-cycle-other-window
1013                                          (vip-switch-to-buffer-other-window)
1014                                          (vip-switch-to-buffer)))
1015         ((string= ex-token "Buffer") (if ex-cycle-other-window
1016                                          (vip-switch-to-buffer)
1017                                          (vip-switch-to-buffer-other-window)))
1018         ((string= ex-token "tag") (ex-tag))
1019         ((string= ex-token "undo") (vip-undo))
1020         ((string= ex-token "unmap") (ex-unmap))
1021         ((string= ex-token "version") (vip-version))
1022         ((string= ex-token "visual") (ex-edit))
1023         ((string= ex-token "write") (ex-write nil))
1024         ((string= ex-token "Write") (save-some-buffers))
1025         ((string= ex-token "wq") (ex-write t))
1026         ((string= ex-token "WWrite") (save-some-buffers t)) ; don't ask
1027         ((string= ex-token "xit") (ex-write t))
1028         ((string= ex-token "yank") (ex-yank))
1029         ((string= ex-token "!") (ex-command))
1030         ((string= ex-token "=") (ex-line-no))
1031         ((string= ex-token ">") (ex-line "right"))
1032         ((string= ex-token "<") (ex-line "left"))
1033         ((string= ex-token "&") (ex-substitute t))
1034         ((string= ex-token "~") (ex-substitute t t))
1035         ((or (string= ex-token "append")
1036              (string= ex-token "change")
1037              (string= ex-token "insert")
1038              (string= ex-token "open"))
1039          (error "`%s': Obsolete command, not supported by Viper" ex-token))
1040         ((or (string= ex-token "abbreviate")
1041              (string= ex-token "unabbreviate"))
1042          (error
1043           "`%s': Vi abbrevs are obsolete. Use the more powerful Emacs abbrevs"
1044           ex-token))
1045         ((or (string= ex-token "list")
1046              (string= ex-token "print")
1047              (string= ex-token "z")
1048              (string= ex-token "#"))
1049          (error "`%s': Command not implemented in Viper" ex-token))
1050         (t (error "`%s': %s" ex-token vip-BadExCommand))))
1051
1052 (defun vip-undisplayed-files ()
1053   (mapcar
1054    (function
1055     (lambda (b)
1056       (if (null (get-buffer-window b))
1057           (let ((f (buffer-file-name b)))
1058             (if f f
1059               (if ex-cycle-through-non-files
1060                   (let ((s (buffer-name b)))
1061                     (if (string= " " (substring s 0 1))
1062                         nil
1063                       s))
1064                 nil)))
1065         nil)))
1066    (buffer-list)))
1067
1068
1069 (defun ex-args ()
1070   (let ((l (vip-undisplayed-files))
1071         (args "")
1072         (file-count 1))
1073     (while (not (null l))
1074       (if (car l)
1075           (setq args (format "%s %d) %s\n" args file-count (car l))
1076                 file-count (1+ file-count)))
1077       (setq l (cdr l)))
1078     (if (string= args "")
1079         (message "All files are already displayed")
1080       (save-excursion
1081         (save-window-excursion
1082           (with-output-to-temp-buffer " *vip-info*"
1083             (princ "\n\nThese files are not displayed in any window.\n")
1084             (princ "\n=============\n")
1085             (princ args)
1086             (princ "\n=============\n")
1087             (princ "\nThe numbers can be given as counts to :next. ")
1088             (princ "\n\nPress any key to continue...\n\n"))
1089           (vip-read-event))))))
1090
1091 ;; Ex cd command. Default directory of this buffer changes
1092 (defun ex-cd ()
1093   (vip-get-ex-file)
1094   (if (string= ex-file "")
1095       (setq ex-file "~"))
1096   (setq default-directory (file-name-as-directory (expand-file-name ex-file))))
1097
1098 ;; Ex copy and move command.  DEL-FLAG means delete
1099 (defun ex-copy (del-flag)
1100   (vip-default-ex-addresses)
1101   (let ((address (vip-get-ex-address))
1102         (end (car ex-addresses)) (beg (car (cdr ex-addresses))))
1103     (goto-char end)
1104     (save-excursion
1105       (push-mark beg t)
1106       (vip-enlarge-region (mark t) (point))
1107       (if del-flag
1108           (kill-region (point) (mark t))
1109         (copy-region-as-kill (point) (mark t)))
1110       (if ex-flag
1111           (progn
1112             (with-output-to-temp-buffer "*copy text*"
1113               (princ
1114                (if (or del-flag ex-g-flag ex-g-variant)
1115                    (current-kill 0)
1116                  (buffer-substring (point) (mark t)))))
1117             (condition-case nil
1118                 (progn
1119                   (read-string "[Hit return to continue] ")
1120                   (save-excursion (kill-buffer "*copy text*")))
1121               (quit (save-excursion (kill-buffer "*copy text*"))
1122                     (signal 'quit nil))))))
1123     (if (= address 0)
1124         (goto-char (point-min))
1125       (goto-char address)
1126       (forward-line 1))
1127       (insert (current-kill 0))))
1128
1129 ;; Ex delete command
1130 (defun ex-delete ()
1131   (vip-default-ex-addresses)
1132   (vip-get-ex-buffer)
1133   (let ((end (car ex-addresses)) (beg (car (cdr ex-addresses))))
1134     (if (> beg end) (error vip-FirstAddrExceedsSecond))
1135     (save-excursion
1136       (vip-enlarge-region beg end)
1137       (exchange-point-and-mark)
1138       (if ex-count
1139           (progn
1140             (set-mark (point))
1141             (forward-line (1- ex-count)))
1142         (set-mark end))
1143       (vip-enlarge-region (point) (mark t))
1144       (if ex-flag
1145           ;; show text to be deleted and ask for confirmation
1146           (progn
1147             (with-output-to-temp-buffer " *delete text*"
1148               (princ (buffer-substring (point) (mark t))))
1149             (condition-case nil
1150                 (read-string "[Hit return to continue] ")
1151               (quit
1152                (save-excursion (kill-buffer " *delete text*"))
1153                (error "")))
1154             (save-excursion (kill-buffer " *delete text*")))
1155         (if ex-buffer
1156             (cond ((vip-valid-register ex-buffer '(Letter))
1157                    (vip-append-to-register
1158                     (downcase ex-buffer) (point) (mark t)))
1159                   ((vip-valid-register ex-buffer)
1160                    (copy-to-register ex-buffer (point) (mark t) nil))
1161                   (t (error vip-InvalidRegister ex-buffer))))
1162         (kill-region (point) (mark t))))))
1163
1164
1165
1166 ;; Ex edit command
1167 ;; In Viper, `e' and `e!' behave identically. In both cases, the user is
1168 ;; asked if current buffer should really be discarded.
1169 ;; This command can take multiple file names. It replaces the current buffer
1170 ;; with the first file in its argument list
1171 (defun ex-edit (&optional file)
1172   (if (not file)
1173       (vip-get-ex-file))
1174   (cond ((and (string= ex-file "") buffer-file-name)
1175          (setq ex-file  (vip-abbreviate-file-name (buffer-file-name))))
1176         ((string= ex-file "")
1177          (error vip-NoFileSpecified)))
1178
1179   (let (msg do-edit)
1180     (if buffer-file-name
1181         (cond ((buffer-modified-p)
1182                (setq msg
1183                      (format "Buffer %s is modified. Discard changes? "
1184                              (buffer-name))
1185                      do-edit t))
1186               ((not (verify-visited-file-modtime (current-buffer)))
1187                (setq msg
1188                      (format "File %s changed on disk.  Reread from disk? "
1189                              buffer-file-name)
1190                      do-edit t))
1191               (t (setq do-edit nil))))
1192
1193     (if do-edit
1194         (if (yes-or-no-p msg)
1195             (progn
1196               (set-buffer-modified-p nil)
1197               (kill-buffer (current-buffer)))
1198           (message "Buffer %s was left intact" (buffer-name))))
1199     ) ; let
1200
1201   (if (null (setq file (get-file-buffer ex-file)))
1202       (progn
1203         (ex-find-file ex-file)
1204         (or (eq major-mode 'dired-mode)
1205             (vip-change-state-to-vi))
1206         (goto-char (point-min)))
1207     (switch-to-buffer file))
1208   (if ex-offset
1209       (progn
1210         (save-window-excursion
1211           (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
1212           (set-buffer vip-ex-work-buf)
1213           (delete-region (point-min) (point-max))
1214           (insert ex-offset "\n")
1215           (goto-char (point-min)))
1216         (goto-char (vip-get-ex-address))
1217         (beginning-of-line)))
1218   (ex-fixup-history vip-last-ex-prompt ex-file))
1219
1220 ;; Find-file FILESPEC if it appears to specify a single file.
1221 ;; Otherwise, assume that FILES{EC is a wildcard.
1222 ;; In this case, split it into substrings separated by newlines.
1223 ;; Each line is assumed to be a file name. find-file's each file thus obtained.
1224 (defun ex-find-file (filespec)
1225   (let ((nonstandard-filename-chars "[^-a-zA-Z0-9_./,~$\\]"))
1226     (cond ((file-exists-p filespec) (find-file filespec))
1227           ((string-match nonstandard-filename-chars  filespec)
1228            (funcall ex-nontrivial-find-file-function filespec))
1229           (t (find-file filespec)))
1230     ))
1231
1232
1233 ;; Ex global command
1234 (defun ex-global (variant)
1235   (let ((gcommand ex-token))
1236     (if (or ex-g-flag ex-g-variant)
1237         (error "`%s' within `global' is not allowed" gcommand)
1238       (if variant
1239           (setq ex-g-flag nil
1240                 ex-g-variant t)
1241         (setq ex-g-flag t
1242               ex-g-variant nil)))
1243     (vip-get-ex-pat)
1244     (if (null ex-token)
1245         (error "`%s': Missing regular expression" gcommand)))
1246
1247   (if (string= ex-token "")
1248       (if (null vip-s-string)
1249           (error vip-NoPrevSearch)
1250         (setq ex-g-pat vip-s-string))
1251     (setq ex-g-pat ex-token
1252           vip-s-string ex-token))
1253   (if (null ex-addresses)
1254       (setq ex-addresses (list (point-max) (point-min)))
1255     (vip-default-ex-addresses))
1256   (let ((marks nil) (mark-count 0)
1257         com-str (end (car ex-addresses)) (beg (car (cdr ex-addresses))))
1258     (if (> beg end) (error vip-FirstAddrExceedsSecond))
1259     (save-excursion
1260       (vip-enlarge-region beg end)
1261       (exchange-point-and-mark)
1262       (let ((cont t) (limit (point-marker)))
1263         (exchange-point-and-mark)
1264         ;; skip the last line if empty
1265         (beginning-of-line)
1266         (if (eobp) (vip-backward-char-carefully))
1267         (while (and cont (not (bobp)) (>= (point) limit))
1268           (beginning-of-line)
1269           (set-mark (point))
1270           (end-of-line)
1271           (let ((found (re-search-backward ex-g-pat (mark t) t)))
1272             (if (or (and ex-g-flag found)
1273                     (and ex-g-variant (not found)))
1274                 (progn
1275                   (end-of-line)
1276                   (setq mark-count (1+ mark-count))
1277                   (setq marks (cons (point-marker) marks)))))
1278           (beginning-of-line)
1279           (if (bobp) (setq cont nil)
1280             (forward-line -1)
1281             (end-of-line)))))
1282     (save-window-excursion
1283       (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
1284       (set-buffer vip-ex-work-buf)
1285       (setq com-str (buffer-substring (1+ (point)) (1- (point-max)))))
1286     (while marks
1287       (goto-char (car marks))
1288       (vip-ex com-str)
1289       (setq mark-count (1- mark-count))
1290       (setq marks (cdr marks)))))
1291
1292 ;; Ex goto command
1293 (defun ex-goto ()
1294   (if (null ex-addresses)
1295       (setq ex-addresses (cons (point) nil)))
1296   (push-mark (point) t)
1297   (goto-char (car ex-addresses))
1298   (beginning-of-line))
1299
1300 ;; Ex line commands.  COM is join, shift-right or shift-left
1301 (defun ex-line (com)
1302   (vip-default-ex-addresses)
1303   (vip-get-ex-count)
1304   (let ((end (car ex-addresses)) (beg (car (cdr ex-addresses))) point)
1305     (if (> beg end) (error vip-FirstAddrExceedsSecond))
1306     (save-excursion
1307       (vip-enlarge-region beg end)
1308       (exchange-point-and-mark)
1309       (if ex-count
1310           (progn
1311             (set-mark (point))
1312             (forward-line ex-count)))
1313       (if ex-flag
1314           ;; show text to be joined and ask for confirmation
1315           (progn
1316             (with-output-to-temp-buffer " *text*"
1317               (princ (buffer-substring (point) (mark t))))
1318             (condition-case nil
1319                 (progn
1320                   (read-string "[Hit return to continue] ")
1321                   (ex-line-subr com (point) (mark t)))
1322               (quit (ding)))
1323             (save-excursion (kill-buffer " *text*")))
1324         (ex-line-subr com (point) (mark t)))
1325       (setq point (point)))
1326     (goto-char (1- point))
1327     (beginning-of-line)))
1328
1329 (defun ex-line-subr (com beg end)
1330   (cond ((string= com "join")
1331          (goto-char (min beg end))
1332          (while (and (not (eobp)) (< (point) (max beg end)))
1333            (end-of-line)
1334            (if (and (<= (point) (max beg end)) (not (eobp)))
1335                (progn
1336                  (forward-line 1)
1337                  (delete-region (point) (1- (point)))
1338                  (if (not ex-variant) (fixup-whitespace))))))
1339         ((or (string= com "right") (string= com "left"))
1340          (indent-rigidly
1341           (min beg end) (max beg end)
1342           (if (string= com "right") vip-shift-width (- vip-shift-width)))
1343          (goto-char (max beg end))
1344          (end-of-line)
1345          (vip-forward-char-carefully))))
1346
1347
1348 ;; Ex mark command
1349 (defun ex-mark ()
1350   (let (char)
1351     (if (null ex-addresses)
1352         (setq ex-addresses
1353               (cons (point) nil)))
1354     (save-window-excursion
1355       (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
1356       (set-buffer vip-ex-work-buf)
1357       (skip-chars-forward " \t")
1358       (if (looking-at "[a-z]")
1359           (progn
1360             (setq char (following-char))
1361             (forward-char 1)
1362             (skip-chars-forward " \t")
1363             (if (not (looking-at "[\n|]"))
1364                 (error "`%s': %s" ex-token vip-SpuriousText)))
1365         (error "`%s' requires a following letter" ex-token)))
1366     (save-excursion
1367       (goto-char (car ex-addresses))
1368       (point-to-register (1+ (- char ?a))))))
1369
1370
1371
1372 ;; Alternate file is the file next to the first one in the buffer ring
1373 (defun ex-next (cycle-other-window &optional find-alt-file)
1374   (catch 'ex-edit
1375     (let (count l)
1376       (if (not find-alt-file)
1377           (progn
1378             (vip-get-ex-file)
1379             (if (or (char-or-string-p ex-offset)
1380                     (and (not (string= "" ex-file))
1381                          (not (string-match "^[0-9]+$" ex-file))))
1382                 (progn
1383                   (ex-edit t)
1384                   (throw 'ex-edit nil))
1385               (setq count (string-to-int ex-file))
1386               (if (= count 0) (setq count 1))
1387               (if (< count 0) (error "Usage: `next <count>' (count >= 0)"))))
1388         (setq count 1))
1389       (setq l (vip-undisplayed-files))
1390       (while (> count 0)
1391         (while (and (not (null l)) (null (car l)))
1392           (setq l (cdr l)))
1393         (setq count (1- count))
1394         (if (> count 0)
1395             (setq l (cdr l))))
1396       (if find-alt-file (car l)
1397         (progn
1398           (if (and (car l) (get-file-buffer (car l)))
1399               (let* ((w (if cycle-other-window
1400                             (get-lru-window) (selected-window)))
1401                      (b (window-buffer w)))
1402                 (set-window-buffer w (get-file-buffer (car l)))
1403                 (bury-buffer b)
1404                 ;; this puts "next <count>" in the ex-command history
1405                 (ex-fixup-history vip-last-ex-prompt ex-file))
1406             (error "Not that many undisplayed files")))))))
1407
1408
1409 (defun ex-next-related-buffer (direction &optional no-recursion)
1410
1411   (vip-ring-rotate1 vip-related-files-and-buffers-ring direction)
1412
1413   (let ((file-or-buffer-name
1414          (vip-current-ring-item vip-related-files-and-buffers-ring))
1415         (old-ring vip-related-files-and-buffers-ring)
1416         (old-win (selected-window))
1417         skip-rest buf wind)
1418
1419     (or (and (ring-p vip-related-files-and-buffers-ring)
1420              (> (ring-length vip-related-files-and-buffers-ring) 0))
1421         (error "This buffer has no related files or buffers"))
1422
1423     (or (stringp file-or-buffer-name)
1424         (error
1425          "File and buffer names must be strings, %S" file-or-buffer-name))
1426
1427     (setq buf (cond ((get-buffer file-or-buffer-name))
1428                     ((file-exists-p file-or-buffer-name)
1429                      (find-file-noselect file-or-buffer-name))
1430                     ))
1431
1432     (if (not (vip-buffer-live-p buf))
1433         (error "Didn't find buffer %S or file %S"
1434                file-or-buffer-name
1435                (vip-abbreviate-file-name
1436                 (expand-file-name file-or-buffer-name))))
1437
1438     (if (equal buf (current-buffer))
1439         (or no-recursion
1440             ;; try again
1441             (progn
1442               (setq skip-rest t)
1443               (ex-next-related-buffer direction 'norecursion))))
1444
1445     (if skip-rest
1446         ()
1447       ;; setup buffer
1448       (if (setq wind (vip-get-visible-buffer-window buf))
1449           ()
1450         (setq wind (get-lru-window (if vip-xemacs-p nil 'visible)))
1451         (set-window-buffer wind buf))
1452
1453       (if (vip-window-display-p)
1454           (progn
1455             (raise-frame (window-frame wind))
1456             (if (equal (window-frame wind) (window-frame old-win))
1457                 (save-window-excursion (select-window wind) (sit-for 1))
1458               (select-window wind)))
1459         (save-window-excursion (select-window wind) (sit-for 1)))
1460
1461       (save-excursion
1462         (set-buffer buf)
1463         (setq vip-related-files-and-buffers-ring old-ring))
1464
1465       (setq vip-local-search-start-marker (point-marker))
1466       )))
1467
1468
1469 ;; Force auto save
1470 (defun ex-preserve ()
1471   (message "Autosaving all buffers that need to be saved...")
1472   (do-auto-save t))
1473
1474 ;; Ex put
1475 (defun ex-put ()
1476   (let ((point (if (null ex-addresses) (point) (car ex-addresses))))
1477     (vip-get-ex-buffer)
1478     (setq vip-use-register ex-buffer)
1479     (goto-char point)
1480     (if (bobp) (vip-Put-back 1) (vip-put-back 1))))
1481
1482 ;; Ex print working directory
1483 (defun ex-pwd ()
1484   (message default-directory))
1485
1486 ;; Ex quit command
1487 (defun ex-quit ()
1488   ;; skip "!", if it is q!. In Viper q!, w!, etc., behave as q, w, etc.
1489   (save-excursion
1490     (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
1491     (set-buffer vip-ex-work-buf)
1492     (if (looking-at "!") (forward-char 1)))
1493   (if (< vip-expert-level 3)
1494       (save-buffers-kill-emacs)
1495     (kill-buffer (current-buffer))))
1496
1497
1498 ;; Ex read command
1499 (defun ex-read ()
1500   (vip-get-ex-file)
1501   (let ((point (if (null ex-addresses) (point) (car ex-addresses)))
1502         command)
1503     (goto-char point)
1504     (vip-add-newline-at-eob-if-necessary)
1505     (if (not (or (bobp) (eobp))) (forward-line 1))
1506     (if (and (not ex-variant) (string= ex-file ""))
1507         (progn
1508           (if (null buffer-file-name)
1509               (error vip-NoFileSpecified))
1510           (setq ex-file buffer-file-name)))
1511     (if ex-cmdfile
1512         (progn
1513           (setq command (ex-expand-filsyms ex-file (current-buffer)))
1514           (shell-command command t))
1515       (insert-file-contents ex-file)))
1516   (ex-fixup-history vip-last-ex-prompt ex-file))
1517
1518 ;; this function fixes ex-history for some commands like ex-read, ex-edit
1519 (defun ex-fixup-history (&rest args)
1520   (setq vip-ex-history
1521         (cons (mapconcat 'identity args " ") (cdr vip-ex-history))))
1522
1523
1524 ;; Ex recover from emacs \#file\#
1525 (defun ex-recover ()
1526   (vip-get-ex-file)
1527   (if (or ex-append ex-offset)
1528       (error "`recover': %s" vip-SpuriousText))
1529   (if (string= ex-file "")
1530       (progn
1531         (if (null buffer-file-name)
1532             (error "This buffer isn't visiting any file"))
1533         (setq ex-file buffer-file-name))
1534     (setq ex-file (expand-file-name ex-file)))
1535   (if (and (not (string= ex-file (buffer-file-name)))
1536            (buffer-modified-p)
1537            (not ex-variant))
1538       (error "No write since last change \(:rec! overrides\)"))
1539   (recover-file ex-file))
1540
1541 ;; Tell that `rewind' is obsolete and to use `:next count' instead
1542 (defun ex-rewind ()
1543   (message
1544    "Use `:n <count>' instead. Counts are obtained from the `:args' command"))
1545
1546
1547 ;; read variable name for ex-set
1548 (defun ex-set-read-variable ()
1549   (let ((minibuffer-local-completion-map
1550          (copy-keymap minibuffer-local-completion-map))
1551         (cursor-in-echo-area t)
1552         str batch)
1553     (define-key
1554       minibuffer-local-completion-map " " 'minibuffer-complete-and-exit)
1555     (define-key minibuffer-local-completion-map "=" 'exit-minibuffer)
1556     (if (vip-set-unread-command-events
1557          (ex-get-inline-cmd-args "[ \t]*[a-zA-Z]*[ \t]*" nil "\C-m"))
1558         (progn
1559           (setq batch t)
1560           (vip-set-unread-command-events ?\C-m)))
1561     (message ":set  <Variable> [= <Value>]")
1562     (or batch (sit-for 2))
1563
1564     (while (string-match "^[ \\t\\n]*$"
1565                          (setq str
1566                                (completing-read ":set " ex-variable-alist)))
1567       (message ":set <Variable> ")
1568       ;; if there are unread events, don't wait
1569       (or (vip-set-unread-command-events "") (sit-for 2))
1570       ) ; while
1571     str))
1572
1573
1574 (defun ex-set ()
1575   (let ((var (ex-set-read-variable))
1576         (val 0)
1577         (set-cmd "setq")
1578         (ask-if-save t)
1579         (auto-cmd-label "; don't touch or else...")
1580         (delete-turn-on-auto-fill-pattern
1581          "([ \t]*add-hook[ \t]+'vip-insert-state-hooks[ \t]+'turn-on-auto-fill.*)")
1582         actual-lisp-cmd lisp-cmd-del-pattern
1583         val2 orig-var)
1584     (setq orig-var var)
1585     (cond ((member var '("ai" "autoindent"))
1586            (setq var "vip-auto-indent"
1587                  set-cmd "setq"
1588                  ask-if-save nil
1589                  val "t"))
1590           ((member var '("gai" "global-autoindent"))
1591            (kill-local-variable 'vip-auto-indent)
1592            (setq var "vip-auto-indent"
1593                  set-cmd "setq-default"
1594                  val "t"))
1595           ((member var '("noai" "noautoindent"))
1596            (setq var "vip-auto-indent"
1597                  ask-if-save nil
1598                  val "nil"))
1599           ((member var '("gnoai" "global-noautoindent"))
1600            (kill-local-variable 'vip-auto-indent)
1601            (setq var "vip-auto-indent"
1602                  set-cmd "setq-default"
1603                  val "nil"))
1604           ((member var '("ic" "ignorecase"))
1605            (setq var "vip-case-fold-search"
1606                  val "t"))
1607           ((member var '("noic" "noignorecase"))
1608            (setq var "vip-case-fold-search"
1609                  val "nil"))
1610           ((member var '("ma" "magic"))
1611            (setq var "vip-re-search"
1612                  val "t"))
1613           ((member var '("noma" "nomagic"))
1614            (setq var "vip-re-search"
1615                  val "nil"))
1616           ((member var '("ro" "readonly"))
1617            (setq var "buffer-read-only"
1618                  val "t"))
1619           ((member var '("noro" "noreadonly"))
1620            (setq var "buffer-read-only"
1621                  val "nil"))
1622           ((member var '("sm" "showmatch"))
1623            (setq var "blink-matching-paren"
1624                  val "t"))
1625           ((member var '("nosm" "noshowmatch"))
1626            (setq var "blink-matching-paren"
1627                  val "nil"))
1628           ((member var '("ws" "wrapscan"))
1629            (setq var "vip-search-wrap-around-t"
1630                  val "t"))
1631           ((member var '("nows" "nowrapscan"))
1632            (setq var "vip-search-wrap-around-t"
1633                  val "nil")))
1634     (if (eq val 0) ; value must be set by the user
1635         (let ((cursor-in-echo-area t))
1636           (message ":set %s = <Value>" var)
1637           ;; if there are unread events, don't wait
1638           (or (vip-set-unread-command-events "") (sit-for 2))
1639           (setq val (read-string (format ":set %s = " var)))
1640           (ex-fixup-history "set" orig-var val)
1641
1642           ;; check numerical values
1643           (if (member var
1644                       '("sw" "shiftwidth"
1645                         "ts" "tabstop"
1646                         "gts" "global-tabstop"
1647                         "wm" "wrapmargin"))
1648               (condition-case nil
1649                   (or (numberp (setq val2 (car (read-from-string val))))
1650                       (error "%s: Invalid value, numberp, %S" var val))
1651                 (error
1652                  (error "%s: Invalid value, numberp, %S" var val))))
1653
1654           (cond
1655            ((member var '("sw" "shiftwidth"))
1656             (setq var "vip-shift-width"))
1657            ((member var '("ts" "tabstop"))
1658             ;; make it take effect in curr buff and new bufs
1659             (setq var "tab-width"
1660                   set-cmd "setq"
1661                   ask-if-save nil))
1662            ((member var '("gts" "global-tabstop"))
1663             (kill-local-variable 'tab-width)
1664             (setq var "tab-width"
1665                   set-cmd "setq-default"))
1666            ((member var '("wm" "wrapmargin"))
1667             ;; make it take effect in curr buff and new bufs
1668             (kill-local-variable 'fill-column)
1669             (setq var "fill-column"
1670                   val (format "(- (window-width) %s)" val)
1671                   set-cmd "setq-default"))
1672            ((member var '("sh" "shell"))
1673             (setq var "explicit-shell-file-name"
1674                   val (format "\"%s\"" val)))))
1675       (ex-fixup-history "set" orig-var))
1676
1677     (setq actual-lisp-cmd (format "\n(%s %s %s) %s"
1678                                   set-cmd var val auto-cmd-label))
1679     (setq lisp-cmd-del-pattern
1680           (format "^\n?[ \t]*([ \t]*%s[ \t]+%s[ \t].*)[ \t]*%s"
1681                   set-cmd var auto-cmd-label))
1682
1683     (if (and ask-if-save
1684              (y-or-n-p (format "Do you want to save this setting in %s "
1685                                vip-custom-file-name)))
1686         (progn
1687           (vip-save-string-in-file
1688            actual-lisp-cmd vip-custom-file-name
1689            ;; del pattern
1690            lisp-cmd-del-pattern)
1691           (if (string= var "fill-column")
1692               (if (> val2 0)
1693                   (vip-save-string-in-file
1694                    (concat
1695                     "(add-hook 'vip-insert-state-hooks 'turn-on-auto-fill) "
1696                     auto-cmd-label)
1697                    vip-custom-file-name
1698                    delete-turn-on-auto-fill-pattern)
1699                 (vip-save-string-in-file
1700                  nil vip-custom-file-name delete-turn-on-auto-fill-pattern)
1701                 (vip-save-string-in-file
1702                  nil vip-custom-file-name
1703                  ;; del pattern
1704                  lisp-cmd-del-pattern)
1705                 ))
1706           ))
1707
1708     (message "%s %s %s" set-cmd var (if (string-match "^[ \t]*$" val)
1709                                         (format "%S" val)
1710                                       val))
1711     (eval (car (read-from-string actual-lisp-cmd)))
1712         (if (string= var "fill-column")
1713                 (if (> val2 0)
1714                         (auto-fill-mode 1)
1715                   (auto-fill-mode -1)))
1716
1717     ))
1718
1719 ;; In inline args, skip regex-forw and (optionally) chars-back.
1720 ;; Optional 3d arg is a string that should replace ' ' to prevent its
1721 ;; special meaning
1722 (defun ex-get-inline-cmd-args (regex-forw &optional chars-back replace-str)
1723   (save-excursion
1724     (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
1725     (set-buffer vip-ex-work-buf)
1726     (goto-char (point-min))
1727     (re-search-forward regex-forw nil t)
1728     (let ((beg (point))
1729           end)
1730       (goto-char (point-max))
1731       (if chars-back
1732           (skip-chars-backward chars-back)
1733         (skip-chars-backward " \t\n\C-m"))
1734       (setq end (point))
1735       ;; replace SPC with `=' to suppress the special meaning SPC has
1736       ;; in Ex commands
1737       (goto-char beg)
1738       (if replace-str
1739           (while (re-search-forward " +" nil t)
1740             (replace-match replace-str nil t)
1741             (vip-forward-char-carefully)))
1742       (goto-char end)
1743       (buffer-substring beg end))))
1744
1745
1746 ;; Ex shell command
1747 (defun ex-shell ()
1748   (shell))
1749
1750 ;; Viper help. Invokes Info
1751 (defun ex-help ()
1752   (condition-case nil
1753       (progn
1754         (pop-to-buffer (get-buffer-create "*info*"))
1755         (info (if vip-xemacs-p "viper.info" "viper"))
1756         (message "Type `i' to search for a specific topic"))
1757     (error (beep 1)
1758            (with-output-to-temp-buffer " *vip-info*"
1759              (princ (format "
1760 The Info file for Viper does not seem to be installed.
1761
1762 This file is part of the standard distribution of %sEmacs.
1763 Please contact your system administrator. "
1764                             (if vip-xemacs-p "X" "")
1765                             ))))))
1766
1767 ;; Ex source command. Loads the file specified as argument or `~/.vip'
1768 (defun ex-source ()
1769   (vip-get-ex-file)
1770   (if (string= ex-file "")
1771       (load vip-custom-file-name)
1772     (load ex-file)))
1773
1774 ;; Ex substitute command
1775 ;; If REPEAT use previous regexp which is ex-reg-exp or vip-s-string
1776 (defun ex-substitute (&optional repeat r-flag)
1777   (let ((opt-g nil)
1778         (opt-c nil)
1779         (matched-pos nil)
1780         (case-fold-search vip-case-fold-search)
1781         delim pat repl)
1782     (if repeat (setq ex-token nil) (setq delim (vip-get-ex-pat)))
1783     (if (null ex-token)
1784         (progn
1785           (setq pat (if r-flag vip-s-string ex-reg-exp))
1786           (or (stringp pat)
1787               (error "No previous pattern to use in substitution"))
1788           (setq repl ex-repl
1789                 delim (string-to-char pat)))
1790       (setq pat (if (string= ex-token "") vip-s-string ex-token))
1791       (setq vip-s-string pat
1792             ex-reg-exp pat)
1793       (setq delim (vip-get-ex-pat))
1794       (if (null ex-token)
1795           (setq ex-token ""
1796                 ex-repl "")
1797         (setq repl ex-token
1798               ex-repl ex-token)))
1799     (while (vip-get-ex-opt-gc delim)
1800       (if (string= ex-token "g") (setq opt-g t) (setq opt-c t)))
1801     (vip-get-ex-count)
1802     (if ex-count
1803         (save-excursion
1804           (if ex-addresses (goto-char (car ex-addresses)))
1805           (set-mark (point))
1806           (forward-line (1- ex-count))
1807           (setq ex-addresses (cons (point) (cons (mark t) nil))))
1808       (if (null ex-addresses)
1809           (setq ex-addresses (cons (point) (cons (point) nil)))
1810         (if (null (cdr ex-addresses))
1811             (setq ex-addresses (cons (car ex-addresses) ex-addresses)))))
1812                                         ;(setq G opt-g)
1813     (let ((beg (car ex-addresses))
1814           (end (car (cdr ex-addresses)))
1815           eol-mark)
1816       (save-excursion
1817         (vip-enlarge-region beg end)
1818         (let ((limit (save-excursion
1819                        (goto-char (max (point) (mark t)))
1820                        (point-marker))))
1821           (goto-char (min (point) (mark t)))
1822           (while (< (point) limit)
1823             (end-of-line)
1824             (setq eol-mark (point-marker))
1825             (beginning-of-line)
1826             (if opt-g
1827                 (progn
1828                   (while (and (not (eolp))
1829                               (re-search-forward pat eol-mark t))
1830                     (if (or (not opt-c) (y-or-n-p "Replace? "))
1831                         (progn
1832                           (setq matched-pos (point))
1833                           (if (not (stringp repl))
1834                               (error "Can't perform Ex substitution: No previous replacement pattern"))
1835                           (replace-match repl t))))
1836                   (end-of-line)
1837                   (vip-forward-char-carefully))
1838               (if (null pat)
1839                   (error
1840                    "Can't repeat Ex substitution: No previous regular expression"))
1841               (if (and (re-search-forward pat eol-mark t)
1842                        (or (not opt-c) (y-or-n-p "Replace? ")))
1843                   (progn
1844                     (setq matched-pos (point))
1845                     (if (not (stringp repl))
1846                         (error "Can't perform Ex substitution: No previous replacement pattern"))
1847                     (replace-match repl t)))
1848               (end-of-line)
1849               (vip-forward-char-carefully))))))
1850     (if matched-pos (goto-char matched-pos))
1851     (beginning-of-line)
1852     (if opt-c (message "done"))))
1853
1854 ;; Ex tag command
1855 (defun ex-tag ()
1856   (let (tag)
1857     (save-window-excursion
1858       (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
1859       (set-buffer vip-ex-work-buf)
1860       (skip-chars-forward " \t")
1861       (set-mark (point))
1862       (skip-chars-forward "^ |\t\n")
1863       (setq tag (buffer-substring (mark t) (point))))
1864     (if (not (string= tag "")) (setq ex-tag tag))
1865     (vip-change-state-to-emacs)
1866     (condition-case conds
1867         (progn
1868           (if (string= tag "")
1869               (find-tag ex-tag t)
1870             (find-tag-other-window ex-tag))
1871           (vip-change-state-to-vi))
1872       (error
1873        (vip-change-state-to-vi)
1874        (vip-message-conditions conds)))))
1875
1876 ;; Ex write command
1877 (defun ex-write (q-flag)
1878   (vip-default-ex-addresses t)
1879   (vip-get-ex-file)
1880   (let ((end (car ex-addresses))
1881         (beg (car (cdr ex-addresses)))
1882         (orig-buf (current-buffer))
1883         (orig-buf-file-name (buffer-file-name))
1884         (orig-buf-name (buffer-name))
1885         (buff-changed-p (buffer-modified-p))
1886         temp-buf writing-same-file region
1887         file-exists writing-whole-file)
1888     (if (> beg end) (error vip-FirstAddrExceedsSecond))
1889     (if ex-cmdfile
1890         (progn
1891           (vip-enlarge-region beg end)
1892           (shell-command-on-region (point) (mark t) ex-file))
1893       (if (and (string= ex-file "") (not (buffer-file-name)))
1894           (setq ex-file
1895                 (read-file-name
1896                  (format "Buffer %s isn't visiting any file. File to save in: "
1897                          (buffer-name)))))
1898
1899       (setq writing-whole-file (and (= (point-min) beg) (= (point-max) end))
1900             ex-file (if (string= ex-file "")
1901                         (buffer-file-name)
1902                       (expand-file-name ex-file)))
1903       ;; if ex-file is a directory use the file portion of the buffer file name
1904       (if (and (file-directory-p ex-file)
1905                buffer-file-name
1906                (not (file-directory-p buffer-file-name)))
1907           (setq ex-file
1908                 (concat (file-name-as-directory ex-file)
1909                         (file-name-nondirectory buffer-file-name))))
1910
1911       (setq file-exists (file-exists-p ex-file)
1912             writing-same-file (string= ex-file (buffer-file-name)))
1913
1914       (if (and writing-whole-file writing-same-file)
1915           (if (not (buffer-modified-p))
1916               (message "(No changes need to be saved)")
1917             (save-buffer)
1918             (save-restriction
1919                  (widen)
1920                  (ex-write-info file-exists ex-file (point-min) (point-max))
1921                  ))
1922         ;; writing some other file or portion of the current file
1923         (cond ((and file-exists
1924                     (not writing-same-file)
1925                     (not (yes-or-no-p
1926                           (format "File %s exists. Overwrite? " ex-file))))
1927                (error "Quit"))
1928               ((and writing-whole-file (not ex-append))
1929                (unwind-protect
1930                    (progn
1931                      (set-visited-file-name ex-file)
1932                      (set-buffer-modified-p t)
1933                      (save-buffer))
1934                  ;; restore the buffer file name
1935                  (set-visited-file-name orig-buf-file-name)
1936                  (set-buffer-modified-p buff-changed-p)
1937                  ;; If the buffer wasn't visiting a file, restore buffer name.
1938                  ;; Name could've been changed by packages such as uniquify.
1939                  (or orig-buf-file-name
1940                      (progn
1941                        (unlock-buffer)
1942                        (rename-buffer orig-buf-name))))
1943                (save-restriction
1944                  (widen)
1945                  (ex-write-info
1946                   file-exists ex-file (point-min) (point-max))))
1947               (t ; writing a region
1948                (unwind-protect
1949                    (save-excursion
1950                      (vip-enlarge-region beg end)
1951                      (setq region (buffer-substring (point) (mark t)))
1952                      ;; create temp buffer for the region
1953                      (setq temp-buf (get-buffer-create " *ex-write*"))
1954                      (set-buffer temp-buf)
1955                      (set-visited-file-name ex-file 'noquerry)
1956                      (erase-buffer)
1957                      (if (and file-exists ex-append)
1958                          (insert-file-contents ex-file))
1959                      (goto-char (point-max))
1960                      (insert region)
1961                      (save-buffer)
1962                      (ex-write-info
1963                       file-exists ex-file (point-min) (point-max))
1964                      ))
1965                (set-buffer temp-buf)
1966                (set-buffer-modified-p nil)
1967                (kill-buffer temp-buf))
1968               ))
1969       (set-buffer orig-buf)
1970       ;; this prevents the loss of data if writing part of the buffer
1971       (if (and (buffer-file-name) writing-same-file)
1972           (set-visited-file-modtime))
1973       (or writing-whole-file
1974           (not writing-same-file)
1975           (set-buffer-modified-p t))
1976       (if q-flag
1977           (if (< vip-expert-level 2)
1978               (save-buffers-kill-emacs)
1979             (kill-buffer (current-buffer))))
1980       )))
1981
1982
1983 (defun ex-write-info (exists file-name beg end)
1984   (message "`%s'%s %d lines, %d characters"
1985            (vip-abbreviate-file-name file-name)
1986            (if exists "" " [New file]")
1987            (count-lines beg (min (1+ end) (point-max)))
1988            (- end beg)))
1989
1990 ;; Ex yank command
1991 (defun ex-yank ()
1992   (vip-default-ex-addresses)
1993   (vip-get-ex-buffer)
1994   (let ((end (car ex-addresses)) (beg (car (cdr ex-addresses))))
1995     (if (> beg end) (error vip-FirstAddrExceedsSecond))
1996     (save-excursion
1997       (vip-enlarge-region beg end)
1998       (exchange-point-and-mark)
1999       (if (or ex-g-flag ex-g-variant)
2000           (error "Can't execute `yank' within `global'"))
2001       (if ex-count
2002           (progn
2003             (set-mark (point))
2004             (forward-line (1- ex-count)))
2005         (set-mark end))
2006       (vip-enlarge-region (point) (mark t))
2007       (if ex-flag (error "`yank': %s" vip-SpuriousText))
2008       (if ex-buffer
2009           (cond ((vip-valid-register ex-buffer '(Letter))
2010                  (vip-append-to-register
2011                   (downcase ex-buffer) (point) (mark t)))
2012                 ((vip-valid-register ex-buffer)
2013                  (copy-to-register ex-buffer (point) (mark t) nil))
2014                 (t (error vip-InvalidRegister ex-buffer))))
2015       (copy-region-as-kill (point) (mark t)))))
2016
2017 ;; Execute shell command
2018 (defun ex-command ()
2019   (let (command)
2020     (save-window-excursion
2021       (setq vip-ex-work-buf (get-buffer-create vip-ex-work-buf-name))
2022       (set-buffer vip-ex-work-buf)
2023       (skip-chars-forward " \t")
2024       (setq command (buffer-substring (point) (point-max)))
2025       (end-of-line))
2026     (setq command (ex-expand-filsyms command (current-buffer)))
2027     (if (and (> (length command) 0) (string= "!" (substring command 0 1)))
2028         (if vip-ex-last-shell-com
2029             (setq command (concat vip-ex-last-shell-com (substring command 1)))
2030           (error "No previous shell command")))
2031     (setq vip-ex-last-shell-com command)
2032     (if (null ex-addresses)
2033         (shell-command command)
2034       (let ((end (car ex-addresses)) (beg (car (cdr ex-addresses))))
2035         (if (null beg) (setq beg end))
2036         (save-excursion
2037           (goto-char beg)
2038           (set-mark end)
2039           (vip-enlarge-region (point) (mark t))
2040           (shell-command-on-region (point) (mark t) command t))
2041         (goto-char beg)))))
2042
2043 ;; Print line number
2044 (defun ex-line-no ()
2045   (message "%d"
2046            (1+ (count-lines
2047                 (point-min)
2048                 (if (null ex-addresses) (point-max) (car ex-addresses))))))
2049
2050 ;; Give information on the file visited by the current buffer
2051 (defun vip-info-on-file ()
2052   (interactive)
2053   (let ((pos1 (vip-line-pos 'start))
2054         (pos2 (vip-line-pos 'end))
2055         lines file info)
2056     (setq lines (count-lines (point-min) (vip-line-pos 'end))
2057           file (if (buffer-file-name)
2058                    (concat (vip-abbreviate-file-name (buffer-file-name)) ":")
2059                  (concat (buffer-name) " [Not visiting any file]:"))
2060           info (format "line=%d/%d pos=%d/%d col=%d %s"
2061                        (if (= pos1 pos2)
2062                            (1+ lines)
2063                          lines)
2064                        (count-lines (point-min) (point-max))
2065                        (point) (1- (point-max))
2066                        (1+ (current-column))
2067                        (if (buffer-modified-p) "[Modified]" "[Unchanged]")))
2068     (if (< (+ 1 (length info) (length file))
2069            (window-width (minibuffer-window)))
2070         (message (concat file " " info))
2071       (save-window-excursion
2072         (with-output-to-temp-buffer " *vip-info*"
2073           (princ (concat "\n"
2074                          file "\n\n\t" info
2075                          "\n\n\nPress any key to continue...\n\n")))
2076         (vip-read-event)
2077         (kill-buffer " *vip-info*")))
2078     ))
2079
2080
2081 ;;;  viper-ex.el ends here