lisp/whitespace.el

   1 ;;; whitespace.el --- minor mode to visualize TAB, (HARD) SPACE, NEWLINE
   2
   3 ;; Copyright (C) 2000-2017 Free Software Foundation, Inc.
   4
   5 ;; Author: Vinicius Jose Latorre <viniciusjl@ig.com.br>
   6 ;; Maintainer: Vinicius Jose Latorre <viniciusjl@ig.com.br>
   7 ;; Keywords: data, wp
   8 ;; Version: 13.2.2
   9 ;; X-URL: http://www.emacswiki.org/cgi-bin/wiki/ViniciusJoseLatorre
  10
  11 ;; This file is part of GNU Emacs.
  12
  13 ;; GNU Emacs is free software: you can redistribute it and/or modify
  14 ;; it under the terms of the GNU General Public License as published by
  15 ;; the Free Software Foundation, either version 3 of the License, or
  16 ;; (at your option) any later version.
  17
  18 ;; GNU Emacs is distributed in the hope that it will be useful,
  19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ;; GNU General Public License for more details.
  22
  23 ;; You should have received a copy of the GNU General Public License
  24 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  25
  26 ;;; Commentary:
  27
  28 ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  29 ;;
  30 ;; Introduction
  31 ;; ------------
  32 ;;
  33 ;; This package is a minor mode to visualize blanks (TAB, (HARD) SPACE
  34 ;; and NEWLINE).
  35 ;;
  36 ;; whitespace uses two ways to visualize blanks: faces and display
  37 ;; table.
  38 ;;
  39 ;; * Faces are used to highlight the background with a color.
  40 ;;   whitespace uses font-lock to highlight blank characters.
  41 ;;
  42 ;; * Display table changes the way a character is displayed, that is,
  43 ;;   it provides a visual mark for characters, for example, at the end
  44 ;;   of line (?\xB6), at SPACEs (?\xB7) and at TABs (?\xBB).
  45 ;;
  46 ;; The `whitespace-style' variable selects which way blanks are
  47 ;; visualized.
  48 ;;
  49 ;; Note that when whitespace is turned on, whitespace saves the
  50 ;; font-lock state, that is, if font-lock is on or off.  And
  51 ;; whitespace restores the font-lock state when it is turned off.  So,
  52 ;; if whitespace is turned on and font-lock is off, whitespace also
  53 ;; turns on the font-lock to highlight blanks, but the font-lock will
  54 ;; be turned off when whitespace is turned off.  Thus, turn on
  55 ;; font-lock before whitespace is on, if you want that font-lock
  56 ;; continues on after whitespace is turned off.
  57 ;;
  58 ;; When whitespace is on, it takes care of highlighting some special
  59 ;; characters over the default mechanism of `nobreak-char-display'
  60 ;; (which see) and `show-trailing-whitespace' (which see).
  61 ;;
  62 ;; The trailing spaces are not highlighted while point is at end of line.
  63 ;; Also the spaces at beginning of buffer are not highlighted while point is at
  64 ;; beginning of buffer; and the spaces at end of buffer are not highlighted
  65 ;; while point is at end of buffer.
  66 ;;
  67 ;; There are two ways of using whitespace: local and global.
  68 ;;
  69 ;; * Local whitespace affects only the current buffer.
  70 ;;
  71 ;; * Global whitespace affects all current and future buffers.  That
  72 ;;   is, if you turn on global whitespace and then create a new
  73 ;;   buffer, the new buffer will also have whitespace on.  The
  74 ;;   `whitespace-global-modes' variable controls which major-mode will
  75 ;;   be automagically turned on.
  76 ;;
  77 ;; You can mix the local and global usage without any conflict.  But
  78 ;; local whitespace has priority over global whitespace.  Whitespace
  79 ;; mode is active in a buffer if you have enabled it in that buffer or
  80 ;; if you have enabled it globally.
  81 ;;
  82 ;; When global and local whitespace are on:
  83 ;;
  84 ;; * if local whitespace is turned off, whitespace is turned off for
  85 ;;   the current buffer only.
  86 ;;
  87 ;; * if global whitespace is turned off, whitespace continues on only
  88 ;;   in the buffers in which local whitespace is on.
  89 ;;
  90 ;; To use whitespace, insert in your ~/.emacs:
  91 ;;
  92 ;;    (require 'whitespace)
  93 ;;
  94 ;; Or autoload at least one of the commands`whitespace-mode',
  95 ;; `whitespace-toggle-options', `global-whitespace-mode' or
  96 ;; `global-whitespace-toggle-options'.  For example:
  97 ;;
  98 ;;    (autoload 'whitespace-mode           "whitespace"
  99 ;;      "Toggle whitespace visualization."        t)
 100 ;;    (autoload 'whitespace-toggle-options "whitespace"
 101 ;;      "Toggle local `whitespace-mode' options." t)
 102 ;;
 103 ;; whitespace was inspired by:
 104 ;;
 105 ;;    whitespace.el            Rajesh Vaidheeswarran <rv@gnu.org>
 106 ;;      Warn about and clean bogus whitespaces in the file
 107 ;;      (inspired the idea to warn and clean some blanks)
 108 ;;      This was the original `whitespace.el' which was replaced by
 109 ;;      `blank-mode.el'.  And later `blank-mode.el' was renamed to
 110 ;;      `whitespace.el'.
 111 ;;
 112 ;;    show-whitespace-mode.el  Aurelien Tisne <aurelien.tisne@free.fr>
 113 ;;       Simple mode to highlight whitespaces
 114 ;;       (inspired the idea to use font-lock)
 115 ;;
 116 ;;    whitespace-mode.el       Lawrence Mitchell <wence@gmx.li>
 117 ;;       Major mode for editing Whitespace
 118 ;;       (inspired the idea to use display table)
 119 ;;
 120 ;;    visws.el                 Miles Bader <miles@gnu.org>
 121 ;;       Make whitespace visible
 122 ;;       (handle display table, his code was modified, but the main
 123 ;;       idea was kept)
 124 ;;
 125 ;;
 126 ;; Using whitespace
 127 ;; ----------------
 128 ;;
 129 ;; There is no problem if you mix local and global minor mode usage.
 130 ;;
 131 ;; * LOCAL whitespace:
 132 ;;    + To toggle whitespace options locally, type:
 133 ;;
 134 ;;         M-x whitespace-toggle-options RET
 135 ;;
 136 ;;    + To activate whitespace locally, type:
 137 ;;
 138 ;;         C-u 1 M-x whitespace-mode RET
 139 ;;
 140 ;;    + To deactivate whitespace locally, type:
 141 ;;
 142 ;;         C-u 0 M-x whitespace-mode RET
 143 ;;
 144 ;;    + To toggle whitespace locally, type:
 145 ;;
 146 ;;         M-x whitespace-mode RET
 147 ;;
 148 ;; * GLOBAL whitespace:
 149 ;;    + To toggle whitespace options globally, type:
 150 ;;
 151 ;;         M-x global-whitespace-toggle-options RET
 152 ;;
 153 ;;    + To activate whitespace globally, type:
 154 ;;
 155 ;;         C-u 1 M-x global-whitespace-mode RET
 156 ;;
 157 ;;    + To deactivate whitespace globally, type:
 158 ;;
 159 ;;         C-u 0 M-x global-whitespace-mode RET
 160 ;;
 161 ;;    + To toggle whitespace globally, type:
 162 ;;
 163 ;;         M-x global-whitespace-mode RET
 164 ;;
 165 ;; There are also the following useful commands:
 166 ;;
 167 ;; `whitespace-newline-mode'
 168 ;;    Toggle NEWLINE minor mode visualization ("nl" on mode line).
 169 ;;
 170 ;; `global-whitespace-newline-mode'
 171 ;;    Toggle NEWLINE global minor mode visualization ("NL" on mode line).
 172 ;;
 173 ;; `whitespace-report'
 174 ;;    Report some blank problems in buffer.
 175 ;;
 176 ;; `whitespace-report-region'
 177 ;;    Report some blank problems in a region.
 178 ;;
 179 ;; `whitespace-cleanup'
 180 ;;    Cleanup some blank problems in all buffer or at region.
 181 ;;    See the function's docstring for more information.
 182 ;;
 183 ;; `whitespace-cleanup-region'
 184 ;;    Cleanup some blank problems at region.
 185 ;;
 186 ;;
 187 ;; Options
 188 ;; -------
 189 ;;
 190 ;; Whitespace's behavior can be changed with `M-x customize-group
 191 ;; whitespace', which see for the full list of options.
 192 ;;
 193 ;;
 194 ;; Hooks
 195 ;; -----
 196 ;;
 197 ;; whitespace has the following hook variables:
 198 ;;
 199 ;; `whitespace-mode-hook'
 200 ;;    It is evaluated always when whitespace is turned on locally.
 201 ;;
 202 ;; `global-whitespace-mode-hook'
 203 ;;    It is evaluated always when whitespace is turned on globally.
 204 ;;
 205 ;; `whitespace-load-hook'
 206 ;;    It is evaluated after whitespace package is loaded.
 207 ;;
 208 ;;
 209 ;; Acknowledgments
 210 ;; ---------------
 211 ;;
 212 ;; Thanks to felix (EmacsWiki) for keeping highlight when switching between
 213 ;; major modes on a file.
 214 ;;
 215 ;; Thanks to David Reitter <david.reitter@gmail.com> for suggesting a
 216 ;; `whitespace-newline' initialization with low contrast relative to
 217 ;; the background color.
 218 ;;
 219 ;; Thanks to Stephen Deasey <sdeasey@gmail.com> for the
 220 ;; `indent-tabs-mode' usage suggestion.
 221 ;;
 222 ;; Thanks to Eric Cooper <ecc@cmu.edu> for the suggestion to have hook
 223 ;; actions when buffer is written as the original whitespace package
 224 ;; had.
 225 ;;
 226 ;; Thanks to nschum (EmacsWiki) for the idea about highlight "long"
 227 ;; lines tail.  See EightyColumnRule (EmacsWiki).
 228 ;;
 229 ;; Thanks to Juri Linkov <juri@jurta.org> for suggesting:
 230 ;;    * `define-minor-mode'.
 231 ;;    * `global-whitespace-*' name for global commands.
 232 ;;
 233 ;; Thanks to Robert J. Chassell <bob@gnu.org> for doc fix and testing.
 234 ;;
 235 ;; Thanks to Drew Adams <drew.adams@oracle.com> for toggle commands
 236 ;; suggestion.
 237 ;;
 238 ;; Thanks to Antti Kaihola <antti.kaihola@linux-aktivaattori.org> for
 239 ;; helping to fix `find-file-hooks' reference.
 240 ;;
 241 ;; Thanks to Andreas Roehler <andreas.roehler@easy-emacs.de> for
 242 ;; indicating defface byte-compilation warnings.
 243 ;;
 244 ;; Thanks to Tim O'Callaghan (EmacsWiki) for the idea about highlight
 245 ;; "long" lines.  See EightyColumnRule (EmacsWiki).
 246 ;;
 247 ;; Thanks to Yanghui Bian <yanghuibian@gmail.com> for indicating a new
 248 ;; NEWLINE character mapping.
 249 ;;
 250 ;; Thanks to Pete Forman <pete.forman@westgeo.com> for indicating
 251 ;; whitespace-mode.el on XEmacs.
 252 ;;
 253 ;; Thanks to Miles Bader <miles@gnu.org> for handling display table via
 254 ;; visws.el (his code was modified, but the main idea was kept).
 255 ;;
 256 ;; Thanks to:
 257 ;;    Rajesh Vaidheeswarran <rv@gnu.org>        (original) whitespace.el
 258 ;;    Aurelien Tisne <aurelien.tisne@free.fr>   show-whitespace-mode.el
 259 ;;    Lawrence Mitchell <wence@gmx.li>          whitespace-mode.el
 260 ;;    Miles Bader <miles@gnu.org>               visws.el
 261 ;; And to all people who contributed with them.
 262 ;;
 263 ;;
 264 ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 265
 266 ;;; code:
 267
 268 \f
 269 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 270 ;;;; User Variables:
 271
 272
 273 ;;; Interface to the command system
 274
 275
 276 (defgroup whitespace nil
 277   "Visualize blanks (TAB, (HARD) SPACE and NEWLINE)."
 278   :link '(emacs-library-link :tag "Source Lisp File" "whitespace.el")
 279   :version "23.1"
 280   :group 'convenience)
 281
 282
 283 (defcustom whitespace-style
 284   '(face
 285     tabs spaces trailing lines space-before-tab newline
 286     indentation empty space-after-tab
 287     space-mark tab-mark newline-mark)
 288   "Specify which kind of blank is visualized.
 289
 290 It's a list containing some or all of the following values:
 291
 292    face                 enable all visualization via faces (see below).
 293
 294    trailing             trailing blanks are visualized via faces.
 295                         It has effect only if `face' (see above)
 296                         is present in `whitespace-style'.
 297
 298    tabs                 TABs are visualized via faces.
 299                         It has effect only if `face' (see above)
 300                         is present in `whitespace-style'.
 301
 302    spaces               SPACEs and HARD SPACEs are visualized via
 303                         faces.
 304                         It has effect only if `face' (see above)
 305                         is present in `whitespace-style'.
 306
 307    lines                lines which have columns beyond
 308                         `whitespace-line-column' are highlighted via
 309                         faces.
 310                         Whole line is highlighted.
 311                         It has precedence over `lines-tail' (see
 312                         below).
 313                         It has effect only if `face' (see above)
 314                         is present in `whitespace-style'.
 315
 316    lines-tail           lines which have columns beyond
 317                         `whitespace-line-column' are highlighted via
 318                         faces.
 319                         But only the part of line which goes
 320                         beyond `whitespace-line-column' column.
 321                         It has effect only if `lines' (see above)
 322                         is not present in `whitespace-style'
 323                         and if `face' (see above) is present in
 324                         `whitespace-style'.
 325
 326    newline              NEWLINEs are visualized via faces.
 327                         It has effect only if `face' (see above)
 328                         is present in `whitespace-style'.
 329
 330    empty                empty lines at beginning and/or end of buffer
 331                         are visualized via faces.
 332                         It has effect only if `face' (see above)
 333                         is present in `whitespace-style'.
 334
 335    indentation::tab     `tab-width' or more SPACEs at beginning of line
 336                         are visualized via faces.
 337                         It has effect only if `face' (see above)
 338                         is present in `whitespace-style'.
 339
 340    indentation::space   TABs at beginning of line are visualized via
 341                         faces.
 342                         It has effect only if `face' (see above)
 343                         is present in `whitespace-style'.
 344
 345    indentation          `tab-width' or more SPACEs at beginning of line
 346                         are visualized, if `indent-tabs-mode' (which
 347                         see) is non-nil; otherwise, TABs at beginning
 348                         of line are visualized via faces.
 349                         It has effect only if `face' (see above)
 350                         is present in `whitespace-style'.
 351
 352    big-indent           Big indentations are visualized via faces.
 353                         It has effect only if `face' (see above)
 354                         is present in `whitespace-style'.
 355
 356    space-after-tab::tab         `tab-width' or more SPACEs after a TAB
 357                                 are visualized via faces.
 358                                 It has effect only if `face' (see above)
 359                                 is present in `whitespace-style'.
 360
 361    space-after-tab::space       TABs are visualized when `tab-width' or
 362                                 more SPACEs occur after a TAB, via
 363                                 faces.
 364                                 It has effect only if `face' (see above)
 365                                 is present in `whitespace-style'.
 366
 367    space-after-tab              `tab-width' or more SPACEs after a TAB
 368                                 are visualized, if `indent-tabs-mode'
 369                                 (which see) is non-nil; otherwise,
 370                                 the TABs are visualized via faces.
 371                                 It has effect only if `face' (see above)
 372                                 is present in `whitespace-style'.
 373
 374    space-before-tab::tab        SPACEs before TAB are visualized via
 375                                 faces.
 376                                 It has effect only if `face' (see above)
 377                                 is present in `whitespace-style'.
 378
 379    space-before-tab::space      TABs are visualized when SPACEs occur
 380                                 before TAB, via faces.
 381                                 It has effect only if `face' (see above)
 382                                 is present in `whitespace-style'.
 383
 384    space-before-tab             SPACEs before TAB are visualized, if
 385                                 `indent-tabs-mode' (which see) is
 386                                 non-nil; otherwise, the TABs are
 387                                 visualized via faces.
 388                                 It has effect only if `face' (see above)
 389                                 is present in `whitespace-style'.
 390
 391    space-mark           SPACEs and HARD SPACEs are visualized via
 392                         display table.
 393
 394    tab-mark             TABs are visualized via display table.
 395
 396    newline-mark         NEWLINEs are visualized via display table.
 397
 398 Any other value is ignored.
 399
 400 If nil, don't visualize TABs, (HARD) SPACEs and NEWLINEs via faces and
 401 via display table.
 402
 403 There is an evaluation order for some values, if they are
 404 included in `whitespace-style' list.  For example, if
 405 indentation, indentation::tab and/or indentation::space are
 406 included in `whitespace-style' list.  The evaluation order for
 407 these values is:
 408
 409  * For indentation:
 410    1. indentation
 411    2. indentation::tab
 412    3. indentation::space
 413
 414  * For SPACEs after TABs:
 415    1. space-after-tab
 416    2. space-after-tab::tab
 417    3. space-after-tab::space
 418
 419  * For SPACEs before TABs:
 420    1. space-before-tab
 421    2. space-before-tab::tab
 422    3. space-before-tab::space
 423
 424 For example, if `indentation' and `indentation::space' are
 425 included in `whitespace-style', the `indentation' value is used
 426 instead of the `indentation::space' value.
 427
 428 One reason to not use faces to visualize spaces (i.e., not
 429 include `face' in `whitespace-style') is to use `whitespace-mode'
 430 only for cleaning up a buffer.  See `whitespace-cleanup' and
 431 `whitespace-cleanup-region'.
 432
 433 See also `whitespace-display-mappings' for documentation."
 434   :type '(set :tag "Kind of Blank"
 435               (const :tag "(Face) Face visualization" face)
 436               (const :tag "(Face) Trailing TABs, SPACEs and HARD SPACEs"
 437                      trailing)
 438               (const :tag "(Face) TABs" tabs)
 439               (const :tag "(Face) SPACEs and HARD SPACEs" spaces)
 440               (const :tag "(Face) Lines" lines)
 441               (const :tag "(Face) Lines, only overlong part" lines-tail)
 442               (const :tag "(Face) NEWLINEs" newline)
 443               (const :tag "(Face) Empty Lines At BOB And/Or EOB" empty)
 444               (const :tag "(Face) Indentation SPACEs" indentation::tab)
 445               (const :tag "(Face) Indentation TABs"
 446                      indentation::space)
 447               (const :tag "(Face) Indentation TABs or SPACEs" indentation)
 448               (const :tag "(Face) Too much line indentation" big-indent)
 449               (const :tag "(Face) SPACEs after TAB: SPACEs"
 450                      space-after-tab::tab)
 451               (const :tag "(Face) SPACEs after TAB: TABs"
 452                      space-after-tab::space)
 453               (const :tag "(Face) SPACEs after TAB" space-after-tab)
 454               (const :tag "(Face) SPACEs before TAB: SPACEs"
 455                      space-before-tab::tab)
 456               (const :tag "(Face) SPACEs before TAB: TABs"
 457                      space-before-tab::space)
 458               (const :tag "(Face) SPACEs before TAB" space-before-tab)
 459               (const :tag "(Mark) SPACEs and HARD SPACEs" space-mark)
 460               (const :tag "(Mark) TABs" tab-mark)
 461               (const :tag "(Mark) NEWLINEs" newline-mark))
 462   :group 'whitespace)
 463
 464 (defvar whitespace-space 'whitespace-space
 465   "Symbol face used to visualize SPACE.
 466 Used when `whitespace-style' includes the value `spaces'.")
 467 (make-obsolete-variable 'whitespace-space "use the face instead." "24.4")
 468
 469
 470 (defface whitespace-space
 471   '((((class color) (background dark))
 472      :background "grey20"      :foreground "darkgray")
 473     (((class color) (background light))
 474      :background "LightYellow" :foreground "lightgray")
 475     (t :inverse-video t))
 476   "Face used to visualize SPACE."
 477   :group 'whitespace)
 478
 479
 480 (defvar whitespace-hspace 'whitespace-hspace
 481   "Symbol face used to visualize HARD SPACE.
 482 Used when `whitespace-style' includes the value `spaces'.")
 483 (make-obsolete-variable 'whitespace-hspace "use the face instead." "24.4")
 484
 485 (defface whitespace-hspace              ; 'nobreak-space
 486   '((((class color) (background dark))
 487      :background "grey24"        :foreground "darkgray")
 488     (((class color) (background light))
 489      :background "LemonChiffon3" :foreground "lightgray")
 490     (t :inverse-video t))
 491   "Face used to visualize HARD SPACE."
 492   :group 'whitespace)
 493
 494
 495 (defvar whitespace-tab 'whitespace-tab
 496   "Symbol face used to visualize TAB.
 497 Used when `whitespace-style' includes the value `tabs'.")
 498 (make-obsolete-variable 'whitespace-tab "use the face instead." "24.4")
 499
 500 (defface whitespace-tab
 501   '((((class color) (background dark))
 502      :background "grey22" :foreground "darkgray")
 503     (((class color) (background light))
 504      :background "beige"  :foreground "lightgray")
 505     (t :inverse-video t))
 506   "Face used to visualize TAB."
 507   :group 'whitespace)
 508
 509
 510 (defvar whitespace-newline 'whitespace-newline
 511   "Symbol face used to visualize NEWLINE char mapping.
 512 See `whitespace-display-mappings'.
 513 Used when `whitespace-style' includes the values `newline-mark'
 514 and `newline'.")
 515 (make-obsolete-variable 'whitespace-newline "use the face instead." "24.4")
 516
 517 (defface whitespace-newline
 518   '((default :weight normal)
 519     (((class color) (background dark)) :foreground "darkgray")
 520     (((class color) (min-colors 88) (background light)) :foreground "lightgray")
 521     ;; Displays with 16 colors use lightgray as background, so using a
 522     ;; lightgray foreground makes the newline mark invisible.
 523     (((class color) (background light)) :foreground "brown")
 524     (t :underline t))
 525   "Face used to visualize NEWLINE char mapping.
 526
 527 See `whitespace-display-mappings'."
 528   :group 'whitespace)
 529
 530
 531 (defvar whitespace-trailing 'whitespace-trailing
 532   "Symbol face used to visualize trailing blanks.
 533 Used when `whitespace-style' includes the value `trailing'.")
 534 (make-obsolete-variable 'whitespace-trailing "use the face instead." "24.4")
 535
 536 (defface whitespace-trailing            ; 'trailing-whitespace
 537   '((default :weight bold)
 538     (((class mono)) :inverse-video t :underline t)
 539     (t :background "red1" :foreground "yellow"))
 540   "Face used to visualize trailing blanks."
 541   :group 'whitespace)
 542
 543
 544 (defvar whitespace-line 'whitespace-line
 545   "Symbol face used to visualize \"long\" lines.
 546 See `whitespace-line-column'.
 547 Used when `whitespace-style' includes the value `line'.")
 548 (make-obsolete-variable 'whitespace-line "use the face instead." "24.4")
 549
 550 (defface whitespace-line
 551   '((((class mono)) :inverse-video t :weight bold :underline t)
 552     (t :background "gray20" :foreground "violet"))
 553   "Face used to visualize \"long\" lines.
 554
 555 See `whitespace-line-column'."
 556   :group 'whitespace)
 557
 558
 559 (defvar whitespace-space-before-tab 'whitespace-space-before-tab
 560   "Symbol face used to visualize SPACEs before TAB.
 561 Used when `whitespace-style' includes the value `space-before-tab'.")
 562 (make-obsolete-variable 'whitespace-space-before-tab
 563                         "use the face instead." "24.4")
 564
 565 (defface whitespace-space-before-tab
 566   '((((class mono)) :inverse-video t :weight bold :underline t)
 567     (t :background "DarkOrange" :foreground "firebrick"))
 568   "Face used to visualize SPACEs before TAB."
 569   :group 'whitespace)
 570
 571
 572 (defvar whitespace-indentation 'whitespace-indentation
 573   "Symbol face used to visualize `tab-width' or more SPACEs at beginning of
 574 line.  Used when `whitespace-style' includes the value `indentation'.")
 575 (make-obsolete-variable 'whitespace-indentation "use the face instead." "24.4")
 576
 577 (defface whitespace-indentation
 578   '((((class mono)) :inverse-video t :weight bold :underline t)
 579     (t :background "yellow" :foreground "firebrick"))
 580   "Face used to visualize `tab-width' or more SPACEs at beginning of line."
 581   :group 'whitespace)
 582
 583 (defface whitespace-big-indent
 584   '((((class mono)) :inverse-video t :weight bold :underline t)
 585     (t :background "red" :foreground "firebrick"))
 586   "Face used to visualize big indentation."
 587   :group 'whitespace)
 588
 589
 590 (defvar whitespace-empty 'whitespace-empty
 591   "Symbol face used to visualize empty lines at beginning and/or end of buffer.
 592 Used when `whitespace-style' includes the value `empty'.")
 593 (make-obsolete-variable 'whitespace-empty "use the face instead." "24.4")
 594
 595 (defface whitespace-empty
 596   '((((class mono)) :inverse-video t :weight bold :underline t)
 597     (t :background "yellow" :foreground "firebrick"))
 598   "Face used to visualize empty lines at beginning and/or end of buffer."
 599   :group 'whitespace)
 600
 601
 602 (defvar whitespace-space-after-tab 'whitespace-space-after-tab
 603   "Symbol face used to visualize `tab-width' or more SPACEs after TAB.
 604 Used when `whitespace-style' includes the value `space-after-tab'.")
 605 (make-obsolete-variable 'whitespace-space-after-tab
 606                         "use the face instead." "24.4")
 607
 608 (defface whitespace-space-after-tab
 609   '((((class mono)) :inverse-video t :weight bold :underline t)
 610     (t :background "yellow" :foreground "firebrick"))
 611   "Face used to visualize `tab-width' or more SPACEs after TAB."
 612   :group 'whitespace)
 613
 614
 615 (defcustom whitespace-hspace-regexp
 616   "\\(\u00A0+\\)"
 617   "Specify HARD SPACE characters regexp.
 618
 619 Here are some examples:
 620
 621    \"\\\\(^\\xA0+\\\\)\"                \
 622 visualize only leading HARD SPACEs.
 623    \"\\\\(\\xA0+$\\\\)\"                \
 624 visualize only trailing HARD SPACEs.
 625    \"\\\\(^\\xA0+\\\\|\\xA0+$\\\\)\"    \
 626 visualize leading and/or trailing HARD SPACEs.
 627    \"\\t\\\\(\\xA0+\\\\)\\t\"           \
 628 visualize only HARD SPACEs between TABs.
 629
 630 NOTE: Enclose always by \\\\( and \\\\) the elements to highlight.
 631       Use exactly one pair of enclosing \\\\( and \\\\).
 632
 633 Used when `whitespace-style' includes `spaces'."
 634   :type '(regexp :tag "HARD SPACE Chars")
 635   :group 'whitespace)
 636
 637
 638 (defcustom whitespace-space-regexp "\\( +\\)"
 639   "Specify SPACE characters regexp.
 640
 641 If you're using `mule' package, there may be other characters
 642 besides \" \" that should be considered SPACE.
 643
 644 Here are some examples:
 645
 646    \"\\\\(^ +\\\\)\"            visualize only leading SPACEs.
 647    \"\\\\( +$\\\\)\"            visualize only trailing SPACEs.
 648    \"\\\\(^ +\\\\| +$\\\\)\"    \
 649 visualize leading and/or trailing SPACEs.
 650    \"\\t\\\\( +\\\\)\\t\"       visualize only SPACEs between TABs.
 651
 652 NOTE: Enclose always by \\\\( and \\\\) the elements to highlight.
 653       Use exactly one pair of enclosing \\\\( and \\\\).
 654
 655 Used when `whitespace-style' includes `spaces'."
 656   :type '(regexp :tag "SPACE Chars")
 657   :group 'whitespace)
 658
 659
 660 (defcustom whitespace-tab-regexp "\\(\t+\\)"
 661   "Specify TAB characters regexp.
 662
 663 If you're using `mule' package, there may be other characters
 664 besides \"\\t\" that should be considered TAB.
 665
 666 Here are some examples:
 667
 668    \"\\\\(^\\t+\\\\)\"          visualize only leading TABs.
 669    \"\\\\(\\t+$\\\\)\"          visualize only trailing TABs.
 670    \"\\\\(^\\t+\\\\|\\t+$\\\\)\"        \
 671 visualize leading and/or trailing TABs.
 672    \" \\\\(\\t+\\\\) \" visualize only TABs between SPACEs.
 673
 674 NOTE: Enclose always by \\\\( and \\\\) the elements to highlight.
 675       Use exactly one pair of enclosing \\\\( and \\\\).
 676
 677 Used when `whitespace-style' includes `tabs'."
 678   :type '(regexp :tag "TAB Chars")
 679   :group 'whitespace)
 680
 681
 682 (defcustom whitespace-trailing-regexp
 683   "\\([\t \u00A0]+\\)$"
 684   "Specify trailing characters regexp.
 685
 686 There may be other characters besides:
 687
 688    \" \"  \"\\t\"  \"\\u00A0\"
 689
 690 that should be considered blank.
 691
 692 NOTE: Enclose always by \"\\\\(\" and \"\\\\)$\" the elements to highlight.
 693       Use exactly one pair of enclosing elements above.
 694
 695 Used when `whitespace-style' includes `trailing'."
 696   :type '(regexp :tag "Trailing Chars")
 697   :group 'whitespace)
 698
 699
 700 (defcustom whitespace-space-before-tab-regexp "\\( +\\)\\(\t+\\)"
 701   "Specify SPACEs before TAB regexp.
 702
 703 Used when `whitespace-style' includes `space-before-tab',
 704 `space-before-tab::tab' or  `space-before-tab::space'."
 705   :type '(regexp :tag "SPACEs Before TAB")
 706   :group 'whitespace)
 707
 708
 709 (defcustom whitespace-indentation-regexp
 710   '("^\t*\\(\\( \\{%d\\}\\)+\\)[^\n\t]"
 711     . "^ *\\(\t+\\)[^\n]")
 712   "Specify regexp for `tab-width' or more SPACEs at beginning of line.
 713
 714 It is a cons where the cons car is used for SPACEs visualization
 715 and the cons cdr is used for TABs visualization.
 716
 717 Used when `whitespace-style' includes `indentation',
 718 `indentation::tab' or  `indentation::space'."
 719   :type '(cons (string :tag "Indentation SPACEs")
 720                (string :tag "Indentation TABs"))
 721   :group 'whitespace)
 722
 723
 724 (defcustom whitespace-empty-at-bob-regexp "\\`\\(\\([ \t]*\n\\)+\\)"
 725   "Specify regexp for empty lines at beginning of buffer.
 726
 727 Used when `whitespace-style' includes `empty'."
 728   :type '(regexp :tag "Empty Lines At Beginning Of Buffer")
 729   :group 'whitespace)
 730
 731
 732 (defcustom whitespace-empty-at-eob-regexp "^\\([ \t\n]+\\)\\'"
 733   "Specify regexp for empty lines at end of buffer.
 734
 735 Used when `whitespace-style' includes `empty'."
 736   :type '(regexp :tag "Empty Lines At End Of Buffer")
 737   :group 'whitespace)
 738
 739
 740 (defcustom whitespace-space-after-tab-regexp
 741   '("\t+\\(\\( \\{%d,\\}\\)+\\)"
 742     . "\\(\t+\\) \\{%d,\\}")
 743   "Specify regexp for `tab-width' or more SPACEs after TAB.
 744
 745 It is a cons where the cons car is used for SPACEs visualization
 746 and the cons cdr is used for TABs visualization.
 747
 748 Used when `whitespace-style' includes `space-after-tab',
 749 `space-after-tab::tab' or `space-after-tab::space'."
 750   :type '(cons (string :tag "SPACEs After TAB")
 751                string)
 752   :group 'whitespace)
 753
 754 (defcustom whitespace-big-indent-regexp
 755   "^\\(\\(?:\t\\{4,\\}\\| \\{32,\\}\\)[\t ]*\\)"
 756   "Specify big indentation regexp.
 757
 758 If you're using `mule' package, there may be other characters
 759 besides \"\\t\" that should be considered TAB.
 760
 761 NOTE: Enclose always by \\\\( and \\\\) the elements to highlight.
 762       Use exactly one pair of enclosing \\\\( and \\\\).
 763
 764 Used when `whitespace-style' includes `big-indent'."
 765   :version "25.1"
 766   :type '(regexp :tag "Detect too much indentation at the beginning of a line")
 767   :group 'whitespace)
 768
 769
 770 (defcustom whitespace-line-column 80
 771   "Specify column beyond which the line is highlighted.
 772
 773 It must be an integer or nil.  If nil, the `fill-column' variable value is
 774 used.
 775
 776 Used when `whitespace-style' includes `lines' or `lines-tail'."
 777   :type '(choice :tag "Line Length Limit"
 778                  (integer :tag "Line Length")
 779                  (const :tag "Use fill-column" nil))
 780   :safe  'integerp
 781   :group 'whitespace)
 782
 783
 784 ;; Hacked from `visible-whitespace-mappings' in visws.el
 785 (defcustom whitespace-display-mappings
 786   '(
 787     (space-mark   ?\     [?·]     [?.])                ; space - middle dot
 788     (space-mark   ?\xA0  [?¤]     [?_])                ; hard space - currency sign
 789     ;; NEWLINE is displayed using the face `whitespace-newline'
 790     (newline-mark ?\n    [?$ ?\n])                      ; eol - dollar sign
 791     ;; (newline-mark ?\n    [?↵ ?\n] [?$ ?\n])        ; eol - downwards arrow
 792     ;; (newline-mark ?\n    [?¶ ?\n] [?$ ?\n]) ; eol - pilcrow
 793     ;; (newline-mark ?\n    [?¯ ?\n]  [?$ ?\n])        ; eol - overscore
 794     ;; (newline-mark ?\n    [?¬ ?\n]  [?$ ?\n])        ; eol - negation
 795     ;; (newline-mark ?\n    [?° ?\n]  [?$ ?\n])        ; eol - degrees
 796     ;;
 797     ;; WARNING: the mapping below has a problem.
 798     ;; When a TAB occupies exactly one column, it will display the
 799     ;; character ?\xBB at that column followed by a TAB which goes to
 800     ;; the next TAB column.
 801     ;; If this is a problem for you, please, comment the line below.
 802     (tab-mark     ?\t    [?» ?\t] [?\\ ?\t])   ; tab - right guillemet
 803     )
 804   "Specify an alist of mappings for displaying characters.
 805
 806 Each element has the following form:
 807
 808    (KIND CHAR VECTOR...)
 809
 810 Where:
 811
 812 KIND    is the kind of character.
 813         It can be one of the following symbols:
 814
 815         tab-mark        for TAB character
 816
 817         space-mark      for SPACE or HARD SPACE character
 818
 819         newline-mark    for NEWLINE character
 820
 821 CHAR    is the character to be mapped.
 822
 823 VECTOR  is a vector of characters to be displayed in place of CHAR.
 824         The first display vector that can be displayed is used;
 825         if no display vector for a mapping can be displayed, then
 826         that character is displayed unmodified.
 827
 828 The NEWLINE character is displayed using the face given by
 829 `whitespace-newline' variable.
 830
 831 Used when `whitespace-style' includes `tab-mark', `space-mark' or
 832 `newline-mark'."
 833   :type '(repeat
 834           (list :tag "Character Mapping"
 835                 (choice :tag "Char Kind"
 836                         (const :tag "Tab" tab-mark)
 837                         (const :tag "Space" space-mark)
 838                         (const :tag "Newline" newline-mark))
 839                 (character :tag "Char")
 840                 (repeat :inline t :tag "Vector List"
 841                         (vector :tag ""
 842                                 (repeat :inline t
 843                                         :tag "Vector Characters"
 844                                         (character :tag "Char"))))))
 845   :group 'whitespace)
 846
 847
 848 (defcustom whitespace-global-modes t
 849   "Modes for which global `whitespace-mode' is automagically turned on.
 850
 851 Global `whitespace-mode' is controlled by the command
 852 `global-whitespace-mode'.
 853
 854 If nil, means no modes have `whitespace-mode' automatically
 855 turned on.
 856
 857 If t, all modes that support `whitespace-mode' have it
 858 automatically turned on.
 859
 860 Else it should be a list of `major-mode' symbol names for which
 861 `whitespace-mode' should be automatically turned on.  The sense
 862 of the list is negated if it begins with `not'.  For example:
 863
 864    (c-mode c++-mode)
 865
 866 means that `whitespace-mode' is turned on for buffers in C and
 867 C++ modes only."
 868   :type '(choice :tag "Global Modes"
 869                  (const :tag "None" nil)
 870                  (const :tag "All" t)
 871                  (set :menu-tag "Mode Specific" :tag "Modes"
 872                       :value (not)
 873                       (const :tag "Except" not)
 874                       (repeat :inline t
 875                               (symbol :tag "Mode"))))
 876   :group 'whitespace)
 877
 878
 879 (defcustom whitespace-action nil
 880   "Specify which action is taken when a buffer is visited or written.
 881
 882 It's a list containing some or all of the following values:
 883
 884    nil                  no action is taken.
 885
 886    cleanup              cleanup any bogus whitespace always when local
 887                         whitespace is turned on.
 888                         See `whitespace-cleanup' and
 889                         `whitespace-cleanup-region'.
 890
 891    report-on-bogus      report if there is any bogus whitespace always
 892                         when local whitespace is turned on.
 893
 894    auto-cleanup         cleanup any bogus whitespace when buffer is
 895                         written.
 896                         See `whitespace-cleanup' and
 897                         `whitespace-cleanup-region'.
 898
 899    abort-on-bogus       abort if there is any bogus whitespace and the
 900                         buffer is written.
 901
 902    warn-if-read-only    give a warning if `cleanup' or `auto-cleanup'
 903                         is included in `whitespace-action' and the
 904                         buffer is read-only.
 905
 906 Any other value is treated as nil."
 907   :type '(choice :tag "Actions"
 908                  (const :tag "None" nil)
 909                  (repeat :tag "Action List"
 910                   (choice :tag "Action"
 911                           (const :tag "Cleanup When On" cleanup)
 912                           (const :tag "Report On Bogus" report-on-bogus)
 913                           (const :tag "Auto Cleanup" auto-cleanup)
 914                           (const :tag "Abort On Bogus" abort-on-bogus)
 915                           (const :tag "Warn If Read-Only" warn-if-read-only))))
 916   :group 'whitespace)
 917
 918 \f
 919 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 920 ;;;; User commands - Local mode
 921
 922
 923 ;;;###autoload
 924 (define-minor-mode whitespace-mode
 925   "Toggle whitespace visualization (Whitespace mode).
 926 With a prefix argument ARG, enable Whitespace mode if ARG is
 927 positive, and disable it otherwise.
 928
 929 If called from Lisp, also enables the mode if ARG is omitted or nil,
 930 and toggles it if ARG is `toggle'.
 931
 932 See also `whitespace-style', `whitespace-newline' and
 933 `whitespace-display-mappings'."
 934   :lighter    " ws"
 935   :init-value nil
 936   :global     nil
 937   :group      'whitespace
 938   (cond
 939    (noninteractive                      ; running a batch job
 940     (setq whitespace-mode nil))
 941    (whitespace-mode                     ; whitespace-mode on
 942     (whitespace-turn-on)
 943     (whitespace-action-when-on))
 944    (t                                   ; whitespace-mode off
 945     (whitespace-turn-off))))
 946
 947
 948 ;;;###autoload
 949 (define-minor-mode whitespace-newline-mode
 950   "Toggle newline visualization (Whitespace Newline mode).
 951 With a prefix argument ARG, enable Whitespace Newline mode if ARG
 952 is positive, and disable it otherwise.
 953
 954 If called from Lisp, also enables the mode if ARG is omitted or nil,
 955 and toggles it if ARG is `toggle'.
 956
 957 Use `whitespace-newline-mode' only for NEWLINE visualization
 958 exclusively.  For other visualizations, including NEWLINE
 959 visualization together with (HARD) SPACEs and/or TABs, please,
 960 use `whitespace-mode'.
 961
 962 See also `whitespace-newline' and `whitespace-display-mappings'."
 963   :lighter    " nl"
 964   :init-value nil
 965   :global     nil
 966   :group      'whitespace
 967   (let ((whitespace-style '(face newline-mark newline)))
 968     (whitespace-mode (if whitespace-newline-mode
 969                          1 -1)))
 970   ;; sync states (running a batch job)
 971   (setq whitespace-newline-mode whitespace-mode))
 972
 973 \f
 974 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 975 ;;;; User commands - Global mode
 976
 977
 978 ;;;###autoload
 979 (define-minor-mode global-whitespace-mode
 980   "Toggle whitespace visualization globally (Global Whitespace mode).
 981 With a prefix argument ARG, enable Global Whitespace mode if ARG
 982 is positive, and disable it otherwise.
 983
 984 If called from Lisp, also enables the mode if ARG is omitted or nil,
 985 and toggles it if ARG is `toggle'.
 986
 987 See also `whitespace-style', `whitespace-newline' and
 988 `whitespace-display-mappings'."
 989   :lighter    " WS"
 990   :init-value nil
 991   :global     t
 992   :group      'whitespace
 993   (cond
 994    (noninteractive                      ; running a batch job
 995     (setq global-whitespace-mode nil))
 996    (global-whitespace-mode              ; global-whitespace-mode on
 997     (save-current-buffer
 998       (add-hook 'find-file-hook 'whitespace-turn-on-if-enabled)
 999       (add-hook 'after-change-major-mode-hook 'whitespace-turn-on-if-enabled)
1000       (dolist (buffer (buffer-list))    ; adjust all local mode
1001         (set-buffer buffer)
1002         (unless whitespace-mode
1003           (whitespace-turn-on-if-enabled)))))
1004    (t                                   ; global-whitespace-mode off
1005     (save-current-buffer
1006       (remove-hook 'find-file-hook 'whitespace-turn-on-if-enabled)
1007       (remove-hook 'after-change-major-mode-hook 'whitespace-turn-on-if-enabled)
1008       (dolist (buffer (buffer-list))    ; adjust all local mode
1009         (set-buffer buffer)
1010         (unless whitespace-mode
1011           (whitespace-turn-off)))))))
1012
1013 (defvar whitespace-enable-predicate
1014   (lambda ()
1015     (and (cond
1016           ((eq whitespace-global-modes t))
1017           ((listp whitespace-global-modes)
1018            (if (eq (car-safe whitespace-global-modes) 'not)
1019                (not (memq major-mode (cdr whitespace-global-modes)))
1020              (memq major-mode whitespace-global-modes)))
1021           (t nil))
1022          ;; ...we have a display (not running a batch job)
1023          (not noninteractive)
1024          ;; ...the buffer is not internal (name starts with a space)
1025          (not (eq (aref (buffer-name) 0) ?\ ))
1026          ;; ...the buffer is not special (name starts with *)
1027          (or (not (eq (aref (buffer-name) 0) ?*))
1028              ;; except the scratch buffer.
1029              (string= (buffer-name) "*scratch*"))))
1030   "Predicate to decide which buffers obey `global-whitespace-mode'.
1031 This function is called with no argument and should return non-nil
1032 if the current buffer should obey `global-whitespace-mode'.
1033 This variable is normally modified via `add-function'.")
1034
1035 (defun whitespace-turn-on-if-enabled ()
1036   (when (funcall whitespace-enable-predicate)
1037     (whitespace-turn-on)))
1038
1039 ;;;###autoload
1040 (define-minor-mode global-whitespace-newline-mode
1041   "Toggle global newline visualization (Global Whitespace Newline mode).
1042 With a prefix argument ARG, enable Global Whitespace Newline mode
1043 if ARG is positive, and disable it otherwise.
1044
1045 If called from Lisp, also enables the mode if ARG is omitted or nil,
1046 and toggles it if ARG is `toggle'.
1047
1048 Use `global-whitespace-newline-mode' only for NEWLINE
1049 visualization exclusively.  For other visualizations, including
1050 NEWLINE visualization together with (HARD) SPACEs and/or TABs,
1051 please use `global-whitespace-mode'.
1052
1053 See also `whitespace-newline' and `whitespace-display-mappings'."
1054   :lighter    " NL"
1055   :init-value nil
1056   :global     t
1057   :group      'whitespace
1058   (let ((whitespace-style '(newline-mark newline)))
1059     (global-whitespace-mode (if global-whitespace-newline-mode
1060                                 1 -1))
1061     ;; sync states (running a batch job)
1062     (setq global-whitespace-newline-mode global-whitespace-mode)))
1063
1064 \f
1065 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1066 ;;;; User commands - Toggle
1067
1068
1069 (defconst whitespace-style-value-list
1070   '(face
1071     tabs
1072     spaces
1073     trailing
1074     lines
1075     lines-tail
1076     newline
1077     empty
1078     indentation
1079     indentation::tab
1080     indentation::space
1081     big-indent
1082     space-after-tab
1083     space-after-tab::tab
1084     space-after-tab::space
1085     space-before-tab
1086     space-before-tab::tab
1087     space-before-tab::space
1088     help-newline       ; value used by `whitespace-insert-option-mark'
1089     tab-mark
1090     space-mark
1091     newline-mark
1092     )
1093   "List of valid `whitespace-style' values.")
1094
1095
1096 (defconst whitespace-toggle-option-alist
1097   '((?f    . face)
1098     (?t    . tabs)
1099     (?s    . spaces)
1100     (?r    . trailing)
1101     (?l    . lines)
1102     (?L    . lines-tail)
1103     (?n    . newline)
1104     (?e    . empty)
1105     (?\C-i . indentation)
1106     (?I    . indentation::tab)
1107     (?i    . indentation::space)
1108     (?\C-t . big-indent)
1109     (?\C-a . space-after-tab)
1110     (?A    . space-after-tab::tab)
1111     (?a    . space-after-tab::space)
1112     (?\C-b . space-before-tab)
1113     (?B    . space-before-tab::tab)
1114     (?b    . space-before-tab::space)
1115     (?T    . tab-mark)
1116     (?S    . space-mark)
1117     (?N    . newline-mark)
1118     (?x    . whitespace-style)
1119     )
1120   "Alist of toggle options.
1121
1122 Each element has the form:
1123
1124    (CHAR . SYMBOL)
1125
1126 Where:
1127
1128 CHAR    is a char which the user will have to type.
1129
1130 SYMBOL  is a valid symbol associated with CHAR.
1131         See `whitespace-style-value-list'.")
1132
1133
1134 (defvar whitespace-active-style nil
1135   "Used to save locally `whitespace-style' value.")
1136
1137 (defvar whitespace-indent-tabs-mode indent-tabs-mode
1138   "Used to save locally `indent-tabs-mode' value.")
1139
1140 (defvar whitespace-tab-width tab-width
1141   "Used to save locally `tab-width' value.")
1142
1143 (defvar whitespace-point (point)
1144   "Used to save locally current point value.
1145 Used by function `whitespace-trailing-regexp' (which see).")
1146 (defvar-local whitespace-point--used nil
1147   "Region whose highlighting depends on `whitespace-point'.")
1148
1149 (defvar whitespace-font-lock-refontify nil
1150   "Used to save locally the font-lock refontify state.
1151 Used by function `whitespace-post-command-hook' (which see).")
1152
1153 (defvar whitespace-bob-marker nil
1154   "Used to save locally the bob marker value.
1155 Used by function `whitespace-post-command-hook' (which see).")
1156
1157 (defvar whitespace-eob-marker nil
1158   "Used to save locally the eob marker value.
1159 Used by function `whitespace-post-command-hook' (which see).")
1160
1161 (defvar whitespace-buffer-changed nil
1162   "Used to indicate locally if buffer changed.
1163 Used by `whitespace-post-command-hook' and `whitespace-buffer-changed'
1164 functions (which see).")
1165
1166
1167 ;;;###autoload
1168 (defun whitespace-toggle-options (arg)
1169   "Toggle local `whitespace-mode' options.
1170
1171 If local whitespace-mode is off, toggle the option given by ARG
1172 and turn on local whitespace-mode.
1173
1174 If local whitespace-mode is on, toggle the option given by ARG
1175 and restart local whitespace-mode.
1176
1177 Interactively, it reads one of the following chars:
1178
1179   CHAR  MEANING
1180   (VIA FACES)
1181    f    toggle face visualization
1182    t    toggle TAB visualization
1183    s    toggle SPACE and HARD SPACE visualization
1184    r    toggle trailing blanks visualization
1185    l    toggle \"long lines\" visualization
1186    L    toggle \"long lines\" tail visualization
1187    n    toggle NEWLINE visualization
1188    e    toggle empty line at bob and/or eob visualization
1189    C-i  toggle indentation SPACEs visualization (via `indent-tabs-mode')
1190    I    toggle indentation SPACEs visualization
1191    i    toggle indentation TABs visualization
1192    C-t  toggle big indentation visualization
1193    C-a  toggle SPACEs after TAB visualization (via `indent-tabs-mode')
1194    A    toggle SPACEs after TAB: SPACEs visualization
1195    a    toggle SPACEs after TAB: TABs visualization
1196    C-b  toggle SPACEs before TAB visualization (via `indent-tabs-mode')
1197    B    toggle SPACEs before TAB: SPACEs visualization
1198    b    toggle SPACEs before TAB: TABs visualization
1199
1200   (VIA DISPLAY TABLE)
1201    T    toggle TAB visualization
1202    S    toggle SPACEs before TAB visualization
1203    N    toggle NEWLINE visualization
1204
1205    x    restore `whitespace-style' value
1206    ?    display brief help
1207
1208 Non-interactively, ARG should be a symbol or a list of symbols.
1209 The valid symbols are:
1210
1211    face                 toggle face visualization
1212    tabs                 toggle TAB visualization
1213    spaces               toggle SPACE and HARD SPACE visualization
1214    trailing             toggle trailing blanks visualization
1215    lines                toggle \"long lines\" visualization
1216    lines-tail           toggle \"long lines\" tail visualization
1217    newline              toggle NEWLINE visualization
1218    empty                toggle empty line at bob and/or eob visualization
1219    indentation          toggle indentation SPACEs visualization
1220    indentation::tab     toggle indentation SPACEs visualization
1221    indentation::space   toggle indentation TABs visualization
1222    big-indent           toggle big indentation visualization
1223    space-after-tab              toggle SPACEs after TAB visualization
1224    space-after-tab::tab         toggle SPACEs after TAB: SPACEs visualization
1225    space-after-tab::space       toggle SPACEs after TAB: TABs visualization
1226    space-before-tab             toggle SPACEs before TAB visualization
1227    space-before-tab::tab        toggle SPACEs before TAB: SPACEs visualization
1228    space-before-tab::space      toggle SPACEs before TAB: TABs visualization
1229
1230    tab-mark             toggle TAB visualization
1231    space-mark           toggle SPACEs before TAB visualization
1232    newline-mark         toggle NEWLINE visualization
1233
1234    whitespace-style     restore `whitespace-style' value
1235
1236 See `whitespace-style' and `indent-tabs-mode' for documentation."
1237   (interactive (whitespace-interactive-char t))
1238   (let ((whitespace-style
1239          (whitespace-toggle-list t arg whitespace-active-style)))
1240     (whitespace-mode 0)
1241     (whitespace-mode 1)))
1242
1243
1244 (defvar whitespace-toggle-style nil
1245   "Used to toggle the global `whitespace-style' value.")
1246
1247
1248 ;;;###autoload
1249 (defun global-whitespace-toggle-options (arg)
1250   "Toggle global `whitespace-mode' options.
1251
1252 If global whitespace-mode is off, toggle the option given by ARG
1253 and turn on global whitespace-mode.
1254
1255 If global whitespace-mode is on, toggle the option given by ARG
1256 and restart global whitespace-mode.
1257
1258 Interactively, it accepts one of the following chars:
1259
1260   CHAR  MEANING
1261   (VIA FACES)
1262    f    toggle face visualization
1263    t    toggle TAB visualization
1264    s    toggle SPACE and HARD SPACE visualization
1265    r    toggle trailing blanks visualization
1266    l    toggle \"long lines\" visualization
1267    L    toggle \"long lines\" tail visualization
1268    n    toggle NEWLINE visualization
1269    e    toggle empty line at bob and/or eob visualization
1270    C-i  toggle indentation SPACEs visualization (via `indent-tabs-mode')
1271    I    toggle indentation SPACEs visualization
1272    i    toggle indentation TABs visualization
1273    C-t  toggle big indentation visualization
1274    C-a  toggle SPACEs after TAB visualization (via `indent-tabs-mode')
1275    A    toggle SPACEs after TAB: SPACEs visualization
1276    a    toggle SPACEs after TAB: TABs visualization
1277    C-b  toggle SPACEs before TAB visualization (via `indent-tabs-mode')
1278    B    toggle SPACEs before TAB: SPACEs visualization
1279    b    toggle SPACEs before TAB: TABs visualization
1280
1281   (VIA DISPLAY TABLE)
1282    T    toggle TAB visualization
1283    S    toggle SPACEs before TAB visualization
1284    N    toggle NEWLINE visualization
1285
1286    x    restore `whitespace-style' value
1287    ?    display brief help
1288
1289 Non-interactively, ARG should be a symbol or a list of symbols.
1290 The valid symbols are:
1291
1292    face                 toggle face visualization
1293    tabs                 toggle TAB visualization
1294    spaces               toggle SPACE and HARD SPACE visualization
1295    trailing             toggle trailing blanks visualization
1296    lines                toggle \"long lines\" visualization
1297    lines-tail           toggle \"long lines\" tail visualization
1298    newline              toggle NEWLINE visualization
1299    empty                toggle empty line at bob and/or eob visualization
1300    indentation          toggle indentation SPACEs visualization
1301    indentation::tab     toggle indentation SPACEs visualization
1302    indentation::space   toggle indentation TABs visualization
1303    big-indent           toggle big indentation visualization
1304    space-after-tab              toggle SPACEs after TAB visualization
1305    space-after-tab::tab         toggle SPACEs after TAB: SPACEs visualization
1306    space-after-tab::space       toggle SPACEs after TAB: TABs visualization
1307    space-before-tab             toggle SPACEs before TAB visualization
1308    space-before-tab::tab        toggle SPACEs before TAB: SPACEs visualization
1309    space-before-tab::space      toggle SPACEs before TAB: TABs visualization
1310
1311    tab-mark             toggle TAB visualization
1312    space-mark           toggle SPACEs before TAB visualization
1313    newline-mark         toggle NEWLINE visualization
1314
1315    whitespace-style     restore `whitespace-style' value
1316
1317 See `whitespace-style' and `indent-tabs-mode' for documentation."
1318   (interactive (whitespace-interactive-char nil))
1319   (let ((whitespace-style
1320          (whitespace-toggle-list nil arg whitespace-toggle-style)))
1321     (setq whitespace-toggle-style whitespace-style)
1322     (global-whitespace-mode 0)
1323     (global-whitespace-mode 1)))
1324
1325 \f
1326 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1327 ;;;; User commands - Cleanup
1328
1329
1330 ;;;###autoload
1331 (defun whitespace-cleanup ()
1332   "Cleanup some blank problems in all buffer or at region.
1333
1334 It usually applies to the whole buffer, but in transient mark
1335 mode when the mark is active, it applies to the region.  It also
1336 applies to the region when it is not in transient mark mode, the
1337 mark is active and \\[universal-argument] was pressed just before
1338 calling `whitespace-cleanup' interactively.
1339
1340 See also `whitespace-cleanup-region'.
1341
1342 The problems cleaned up are:
1343
1344 1. empty lines at beginning of buffer.
1345 2. empty lines at end of buffer.
1346    If `whitespace-style' includes the value `empty', remove all
1347    empty lines at beginning and/or end of buffer.
1348
1349 3. `tab-width' or more SPACEs at beginning of line.
1350    If `whitespace-style' includes the value `indentation':
1351    replace `tab-width' or more SPACEs at beginning of line by
1352    TABs, if `indent-tabs-mode' is non-nil; otherwise, replace TABs by
1353    SPACEs.
1354    If `whitespace-style' includes the value `indentation::tab',
1355    replace `tab-width' or more SPACEs at beginning of line by TABs.
1356    If `whitespace-style' includes the value `indentation::space',
1357    replace TABs by SPACEs.
1358
1359 4. SPACEs before TAB.
1360    If `whitespace-style' includes the value `space-before-tab':
1361    replace SPACEs by TABs, if `indent-tabs-mode' is non-nil;
1362    otherwise, replace TABs by SPACEs.
1363    If `whitespace-style' includes the value
1364    `space-before-tab::tab', replace SPACEs by TABs.
1365    If `whitespace-style' includes the value
1366    `space-before-tab::space', replace TABs by SPACEs.
1367
1368 5. SPACEs or TABs at end of line.
1369    If `whitespace-style' includes the value `trailing', remove
1370    all SPACEs or TABs at end of line.
1371
1372 6. `tab-width' or more SPACEs after TAB.
1373    If `whitespace-style' includes the value `space-after-tab':
1374    replace SPACEs by TABs, if `indent-tabs-mode' is non-nil;
1375    otherwise, replace TABs by SPACEs.
1376    If `whitespace-style' includes the value
1377    `space-after-tab::tab', replace SPACEs by TABs.
1378    If `whitespace-style' includes the value
1379    `space-after-tab::space', replace TABs by SPACEs.
1380
1381 See `whitespace-style', `indent-tabs-mode' and `tab-width' for
1382 documentation."
1383   (interactive "@")
1384   (cond
1385    ;; read-only buffer
1386    (buffer-read-only
1387     (whitespace-warn-read-only "cleanup"))
1388    ;; region active
1389    ((and (or transient-mark-mode
1390              current-prefix-arg)
1391          mark-active)
1392     ;; PROBLEMs 1 and 2 are not handled in region
1393     ;; PROBLEM 3: `tab-width' or more SPACEs at bol
1394     ;; PROBLEM 4: SPACEs before TAB
1395     ;; PROBLEM 5: SPACEs or TABs at eol
1396     ;; PROBLEM 6: `tab-width' or more SPACEs after TAB
1397     (whitespace-cleanup-region (region-beginning) (region-end)))
1398    ;; whole buffer
1399    (t
1400     (save-excursion
1401       ;; PROBLEM 1: empty lines at bob
1402       ;; PROBLEM 2: empty lines at eob
1403       ;; ACTION: remove all empty lines at bob and/or eob
1404       (when (memq 'empty whitespace-style)
1405         (let (overwrite-mode)           ; enforce no overwrite
1406           (goto-char (point-min))
1407           (when (looking-at whitespace-empty-at-bob-regexp)
1408             (delete-region (match-beginning 1) (match-end 1)))
1409           (when (re-search-forward
1410                  whitespace-empty-at-eob-regexp nil t)
1411             (delete-region (match-beginning 1) (match-end 1))))))
1412     ;; PROBLEM 3: `tab-width' or more SPACEs at bol
1413     ;; PROBLEM 4: SPACEs before TAB
1414     ;; PROBLEM 5: SPACEs or TABs at eol
1415     ;; PROBLEM 6: `tab-width' or more SPACEs after TAB
1416     (whitespace-cleanup-region (point-min) (point-max)))))
1417
1418 (defun whitespace-ensure-local-variables ()
1419   "Set `whitespace-indent-tabs-mode' and `whitespace-tab-width' locally."
1420   (set (make-local-variable 'whitespace-indent-tabs-mode)
1421        indent-tabs-mode)
1422   (set (make-local-variable 'whitespace-tab-width)
1423        tab-width))
1424
1425 ;;;###autoload
1426 (defun whitespace-cleanup-region (start end)
1427   "Cleanup some blank problems at region.
1428
1429 The problems cleaned up are:
1430
1431 1. `tab-width' or more SPACEs at beginning of line.
1432    If `whitespace-style' includes the value `indentation':
1433    replace `tab-width' or more SPACEs at beginning of line by TABs,
1434    if `indent-tabs-mode' is non-nil; otherwise, replace TABs by
1435    SPACEs.
1436    If `whitespace-style' includes the value `indentation::tab',
1437    replace `tab-width' or more SPACEs at beginning of line by TABs.
1438    If `whitespace-style' includes the value `indentation::space',
1439    replace TABs by SPACEs.
1440
1441 2. SPACEs before TAB.
1442    If `whitespace-style' includes the value `space-before-tab':
1443    replace SPACEs by TABs, if `indent-tabs-mode' is non-nil;
1444    otherwise, replace TABs by SPACEs.
1445    If `whitespace-style' includes the value
1446    `space-before-tab::tab', replace SPACEs by TABs.
1447    If `whitespace-style' includes the value
1448    `space-before-tab::space', replace TABs by SPACEs.
1449
1450 3. SPACEs or TABs at end of line.
1451    If `whitespace-style' includes the value `trailing', remove
1452    all SPACEs or TABs at end of line.
1453
1454 4. `tab-width' or more SPACEs after TAB.
1455    If `whitespace-style' includes the value `space-after-tab':
1456    replace SPACEs by TABs, if `indent-tabs-mode' is non-nil;
1457    otherwise, replace TABs by SPACEs.
1458    If `whitespace-style' includes the value
1459    `space-after-tab::tab', replace SPACEs by TABs.
1460    If `whitespace-style' includes the value
1461    `space-after-tab::space', replace TABs by SPACEs.
1462
1463 See `whitespace-style', `indent-tabs-mode' and `tab-width' for
1464 documentation."
1465   (interactive "@r")
1466   (if buffer-read-only
1467       ;; read-only buffer
1468       (whitespace-warn-read-only "cleanup region")
1469     ;; non-read-only buffer
1470     (whitespace-ensure-local-variables)
1471     (let ((rstart           (min start end))
1472           (rend             (copy-marker (max start end)))
1473           (indent-tabs-mode whitespace-indent-tabs-mode)
1474           (tab-width        whitespace-tab-width)
1475           overwrite-mode                ; enforce no overwrite
1476           tmp)
1477       (save-excursion
1478         ;; PROBLEM 1: `tab-width' or more SPACEs at bol
1479         (cond
1480          ;; ACTION: replace `tab-width' or more SPACEs at bol by TABs, if
1481          ;; `indent-tabs-mode' is non-nil; otherwise, replace TABs
1482          ;; by SPACEs.
1483          ((memq 'indentation whitespace-style)
1484           (let ((regexp (whitespace-indentation-regexp)))
1485             (goto-char rstart)
1486             (while (re-search-forward regexp rend t)
1487               (setq tmp (current-indentation))
1488               (goto-char (match-beginning 0))
1489               (delete-horizontal-space)
1490               (unless (eolp)
1491                 (indent-to tmp)))))
1492          ;; ACTION: replace `tab-width' or more SPACEs at bol by TABs.
1493          ((memq 'indentation::tab whitespace-style)
1494           (whitespace-replace-action
1495            'tabify rstart rend
1496            (whitespace-indentation-regexp 'tab) 0))
1497          ;; ACTION: replace TABs by SPACEs.
1498          ((memq 'indentation::space whitespace-style)
1499           (whitespace-replace-action
1500            'untabify rstart rend
1501            (whitespace-indentation-regexp 'space) 0)))
1502         ;; PROBLEM 3: SPACEs or TABs at eol
1503         ;; ACTION: remove all SPACEs or TABs at eol
1504         (when (memq 'trailing whitespace-style)
1505           (whitespace-replace-action
1506            'delete-region rstart rend
1507            whitespace-trailing-regexp 1))
1508         ;; PROBLEM 4: `tab-width' or more SPACEs after TAB
1509         (cond
1510          ;; ACTION: replace `tab-width' or more SPACEs by TABs, if
1511          ;; `indent-tabs-mode' is non-nil; otherwise, replace TABs
1512          ;; by SPACEs.
1513          ((memq 'space-after-tab whitespace-style)
1514           (whitespace-replace-action
1515            (if whitespace-indent-tabs-mode 'tabify 'untabify)
1516            rstart rend (whitespace-space-after-tab-regexp) 1))
1517          ;; ACTION: replace `tab-width' or more SPACEs by TABs.
1518          ((memq 'space-after-tab::tab whitespace-style)
1519           (whitespace-replace-action
1520            'tabify rstart rend
1521            (whitespace-space-after-tab-regexp 'tab) 1))
1522          ;; ACTION: replace TABs by SPACEs.
1523          ((memq 'space-after-tab::space whitespace-style)
1524           (whitespace-replace-action
1525            'untabify rstart rend
1526            (whitespace-space-after-tab-regexp 'space) 1)))
1527         ;; PROBLEM 2: SPACEs before TAB
1528         (cond
1529          ;; ACTION: replace SPACEs before TAB by TABs, if
1530          ;; `indent-tabs-mode' is non-nil; otherwise, replace TABs
1531          ;; by SPACEs.
1532          ((memq 'space-before-tab whitespace-style)
1533           (whitespace-replace-action
1534            (if whitespace-indent-tabs-mode 'tabify 'untabify)
1535            rstart rend whitespace-space-before-tab-regexp
1536            (if whitespace-indent-tabs-mode 0 2)))
1537          ;; ACTION: replace SPACEs before TAB by TABs.
1538          ((memq 'space-before-tab::tab whitespace-style)
1539           (whitespace-replace-action
1540            'tabify rstart rend
1541            whitespace-space-before-tab-regexp 0))
1542          ;; ACTION: replace TABs by SPACEs.
1543          ((memq 'space-before-tab::space whitespace-style)
1544           (whitespace-replace-action
1545            'untabify rstart rend
1546            whitespace-space-before-tab-regexp 2))))
1547       (set-marker rend nil))))          ; point marker to nowhere
1548
1549
1550 (defun whitespace-replace-action (action rstart rend regexp index)
1551   "Do ACTION in the string matched by REGEXP between RSTART and REND.
1552
1553 INDEX is the level group matched by REGEXP and used by ACTION.
1554
1555 See also `tab-width'."
1556   (goto-char rstart)
1557   (while (re-search-forward regexp rend t)
1558     (goto-char (match-end index))
1559     (funcall action (match-beginning index) (match-end index))))
1560
1561 \f
1562 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1563 ;;;; User command - report
1564
1565
1566 (defun whitespace-regexp (regexp &optional kind)
1567   "Return REGEXP depending on `whitespace-indent-tabs-mode'."
1568   (format
1569    (cond
1570     ((or (eq kind 'tab)
1571          whitespace-indent-tabs-mode)
1572      (car regexp))
1573     ((or (eq kind 'space)
1574          (not whitespace-indent-tabs-mode))
1575      (cdr regexp)))
1576    whitespace-tab-width))
1577
1578
1579 (defun whitespace-indentation-regexp (&optional kind)
1580   "Return the indentation regexp depending on `whitespace-indent-tabs-mode'."
1581   (whitespace-regexp whitespace-indentation-regexp kind))
1582
1583
1584 (defun whitespace-space-after-tab-regexp (&optional kind)
1585   "Return the space-after-tab regexp depending on `whitespace-indent-tabs-mode'."
1586   (whitespace-regexp whitespace-space-after-tab-regexp kind))
1587
1588
1589 (defconst whitespace-report-list
1590   (list
1591    (cons 'empty                   whitespace-empty-at-bob-regexp)
1592    (cons 'empty                   whitespace-empty-at-eob-regexp)
1593    (cons 'trailing                whitespace-trailing-regexp)
1594    (cons 'indentation             nil)
1595    (cons 'indentation::tab        nil)
1596    (cons 'indentation::space      nil)
1597    (cons 'space-before-tab        whitespace-space-before-tab-regexp)
1598    (cons 'space-before-tab::tab   whitespace-space-before-tab-regexp)
1599    (cons 'space-before-tab::space whitespace-space-before-tab-regexp)
1600    (cons 'space-after-tab         nil)
1601    (cons 'space-after-tab::tab    nil)
1602    (cons 'space-after-tab::space  nil)
1603    )
1604    "List of whitespace bogus symbol and corresponding regexp.")
1605
1606
1607 (defconst whitespace-report-text
1608   '( ;; `indent-tabs-mode' has non-nil value
1609     "\
1610  Whitespace Report
1611
1612  Current Setting                       Whitespace Problem
1613
1614  empty                    []     []  empty lines at beginning of buffer
1615  empty                    []     []  empty lines at end of buffer
1616  trailing                 []     []  SPACEs or TABs at end of line
1617  indentation              []     []  >= `tab-width' SPACEs at beginning of line
1618  indentation::tab         []     []  >= `tab-width' SPACEs at beginning of line
1619  indentation::space       []     []  TABs at beginning of line
1620  space-before-tab         []     []  SPACEs before TAB
1621  space-before-tab::tab    []     []  SPACEs before TAB: SPACEs
1622  space-before-tab::space  []     []  SPACEs before TAB: TABs
1623  space-after-tab          []     []  >= `tab-width' SPACEs after TAB
1624  space-after-tab::tab     []     []  >= `tab-width' SPACEs after TAB: SPACEs
1625  space-after-tab::space   []     []  >= `tab-width' SPACEs after TAB: TABs
1626
1627  indent-tabs-mode =
1628  tab-width        = \n\n"
1629     . ;; `indent-tabs-mode' has nil value
1630     "\
1631  Whitespace Report
1632
1633  Current Setting                       Whitespace Problem
1634
1635  empty                    []     []  empty lines at beginning of buffer
1636  empty                    []     []  empty lines at end of buffer
1637  trailing                 []     []  SPACEs or TABs at end of line
1638  indentation              []     []  TABs at beginning of line
1639  indentation::tab         []     []  >= `tab-width' SPACEs at beginning of line
1640  indentation::space       []     []  TABs at beginning of line
1641  space-before-tab         []     []  SPACEs before TAB
1642  space-before-tab::tab    []     []  SPACEs before TAB: SPACEs
1643  space-before-tab::space  []     []  SPACEs before TAB: TABs
1644  space-after-tab          []     []  >= `tab-width' SPACEs after TAB
1645  space-after-tab::tab     []     []  >= `tab-width' SPACEs after TAB: SPACEs
1646  space-after-tab::space   []     []  >= `tab-width' SPACEs after TAB: TABs
1647
1648  indent-tabs-mode =
1649  tab-width        = \n\n")
1650   "Text for whitespace bogus report.
1651
1652 It is a cons of strings, where the car part is used when
1653 `indent-tabs-mode' is non-nil, and the cdr part is used when
1654 `indent-tabs-mode' is nil.")
1655
1656
1657 (defconst whitespace-report-buffer-name "*Whitespace Report*"
1658   "The buffer name for whitespace bogus report.")
1659
1660
1661 ;;;###autoload
1662 (defun whitespace-report (&optional force report-if-bogus)
1663   "Report some whitespace problems in buffer.
1664
1665 Perform `whitespace-report-region' on the current buffer."
1666   (interactive (list current-prefix-arg))
1667   (whitespace-report-region (point-min) (point-max)
1668                             force report-if-bogus))
1669
1670
1671 ;;;###autoload
1672 (defun whitespace-report-region (start end &optional force report-if-bogus)
1673   "Report some whitespace problems in a region.
1674
1675 Return nil if there is no whitespace problem; otherwise, return
1676 non-nil.
1677
1678 If FORCE is non-nil or \\[universal-argument] was pressed just
1679 before calling `whitespace-report-region' interactively, it
1680 forces all classes of whitespace problem to be considered
1681 significant.
1682
1683 If REPORT-IF-BOGUS is t, it reports only when there are any
1684 whitespace problems in buffer; if it is `never', it does not
1685 report problems.
1686
1687 Report if some of the following whitespace problems exist:
1688
1689 * If `indent-tabs-mode' is non-nil:
1690    empty                1. empty lines at beginning of buffer.
1691    empty                2. empty lines at end of buffer.
1692    trailing             3. SPACEs or TABs at end of line.
1693    indentation          4. line starts with `tab-width' or more SPACEs.
1694    space-before-tab     5. SPACEs before TAB.
1695    space-after-tab      6. `tab-width' or more SPACEs after TAB.
1696
1697 * If `indent-tabs-mode' is nil:
1698    empty                1. empty lines at beginning of buffer.
1699    empty                2. empty lines at end of buffer.
1700    trailing             3. SPACEs or TABs at end of line.
1701    indentation          4. TABS at beginning of line.
1702    space-before-tab     5. SPACEs before TAB.
1703    space-after-tab      6. `tab-width' or more SPACEs after TAB.
1704
1705 See `whitespace-style' for documentation.
1706 See also `whitespace-cleanup' and `whitespace-cleanup-region' for
1707 cleaning up these problems."
1708   (interactive "r")
1709   (setq force (or current-prefix-arg force))
1710   (save-excursion
1711     (let* ((has-bogus nil)
1712            (rstart    (min start end))
1713            (rend      (max start end))
1714            ;; Fall back to whitespace-style so we can run before
1715            ;; before the mode is active.
1716            (style     (copy-sequence
1717                        (or whitespace-active-style whitespace-style)))
1718            (bogus-list
1719             (mapcar
1720              #'(lambda (option)
1721                  (when force
1722                    (add-to-list 'style (car option)))
1723                  (goto-char rstart)
1724                  (let ((regexp
1725                         (cond
1726                          ((eq (car option) 'indentation)
1727                           (whitespace-indentation-regexp))
1728                          ((eq (car option) 'indentation::tab)
1729                           (whitespace-indentation-regexp 'tab))
1730                          ((eq (car option) 'indentation::space)
1731                           (whitespace-indentation-regexp 'space))
1732                          ((eq (car option) 'space-after-tab)
1733                           (whitespace-space-after-tab-regexp))
1734                          ((eq (car option) 'space-after-tab::tab)
1735                           (whitespace-space-after-tab-regexp 'tab))
1736                          ((eq (car option) 'space-after-tab::space)
1737                           (whitespace-space-after-tab-regexp 'space))
1738                          (t
1739                           (cdr option)))))
1740                    (when (re-search-forward regexp rend t)
1741                      (unless has-bogus
1742                        (setq has-bogus (memq (car option) style)))
1743                      t)))
1744              whitespace-report-list)))
1745       (when (pcase report-if-bogus (`nil t) (`never nil) (_ has-bogus))
1746         (whitespace-kill-buffer whitespace-report-buffer-name)
1747         ;; `whitespace-indent-tabs-mode' is local to current buffer
1748         ;; `whitespace-tab-width' is local to current buffer
1749         (let ((ws-indent-tabs-mode whitespace-indent-tabs-mode)
1750               (ws-tab-width whitespace-tab-width))
1751           (with-current-buffer (get-buffer-create
1752                                 whitespace-report-buffer-name)
1753             (erase-buffer)
1754             (insert (if ws-indent-tabs-mode
1755                         (car whitespace-report-text)
1756                       (cdr whitespace-report-text)))
1757             (goto-char (point-min))
1758             (forward-line 3)
1759             (dolist (option whitespace-report-list)
1760               (forward-line 1)
1761               (whitespace-mark-x
1762                27 (memq (car option) style))
1763               (whitespace-mark-x 7 (car bogus-list))
1764               (setq bogus-list (cdr bogus-list)))
1765             (forward-line 1)
1766             (whitespace-insert-value ws-indent-tabs-mode)
1767             (whitespace-insert-value ws-tab-width)
1768             (when has-bogus
1769               (goto-char (point-max))
1770               (insert (substitute-command-keys
1771                        " Type `\\[whitespace-cleanup]'")
1772                       " to cleanup the buffer.\n\n"
1773                       (substitute-command-keys
1774                        " Type `\\[whitespace-cleanup-region]'")
1775                       " to cleanup a region.\n\n"))
1776             (whitespace-display-window (current-buffer)))))
1777       has-bogus)))
1778
1779 \f
1780 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1781 ;;;; Internal functions
1782
1783
1784 (defvar whitespace-font-lock-keywords nil
1785   "Used to save the value `whitespace-color-on' adds to `font-lock-keywords'.")
1786
1787
1788 (defconst whitespace-help-text
1789   "\
1790  Whitespace Toggle Options                  | scroll up  :  SPC   or > |
1791                                             | scroll down:  M-SPC or < |
1792  FACES                                      \\__________________________/
1793  []  f   - toggle face visualization
1794  []  t   - toggle TAB visualization
1795  []  s   - toggle SPACE and HARD SPACE visualization
1796  []  r   - toggle trailing blanks visualization
1797  []  l   - toggle \"long lines\" visualization
1798  []  L   - toggle \"long lines\" tail visualization
1799  []  n   - toggle NEWLINE visualization
1800  []  e   - toggle empty line at bob and/or eob visualization
1801  []  C-i - toggle indentation SPACEs visualization (via `indent-tabs-mode')
1802  []  I   - toggle indentation SPACEs visualization
1803  []  i   - toggle indentation TABs visualization
1804  []  C-t - toggle big indentation visualization
1805  []  C-a - toggle SPACEs after TAB visualization (via `indent-tabs-mode')
1806  []  A   - toggle SPACEs after TAB: SPACEs visualization
1807  []  a   - toggle SPACEs after TAB: TABs visualization
1808  []  C-b - toggle SPACEs before TAB visualization (via `indent-tabs-mode')
1809  []  B   - toggle SPACEs before TAB: SPACEs visualization
1810  []  b   - toggle SPACEs before TAB: TABs visualization
1811
1812  DISPLAY TABLE
1813  []  T - toggle TAB visualization
1814  []  S - toggle SPACE and HARD SPACE visualization
1815  []  N - toggle NEWLINE visualization
1816
1817       x - restore `whitespace-style' value
1818
1819       ? - display this text\n\n"
1820   "Text for whitespace toggle options.")
1821
1822
1823 (defconst whitespace-help-buffer-name "*Whitespace Toggle Options*"
1824   "The buffer name for whitespace toggle options.")
1825
1826
1827 (defun whitespace-insert-value (value)
1828   "Insert VALUE at column 20 of next line."
1829   (forward-line 1)
1830   (move-to-column 20 t)
1831   (insert (format "%s" value)))
1832
1833
1834 (defun whitespace-mark-x (nchars condition)
1835   "Insert the mark (`X' or ` ') after NCHARS depending on CONDITION."
1836   (forward-char nchars)
1837   (insert (if condition "X" " ")))
1838
1839
1840 (defun whitespace-insert-option-mark (the-list the-value)
1841   "Insert the option mark (`X' or ` ') in toggle options buffer."
1842   (goto-char (point-min))
1843   (forward-line 2)
1844   (dolist (sym  the-list)
1845     (if (eq sym 'help-newline)
1846         (forward-line 2)
1847       (forward-line 1)
1848       (whitespace-mark-x 2 (memq sym the-value)))))
1849
1850
1851 (defun whitespace-help-on (style)
1852   "Display the whitespace toggle options."
1853   (unless (get-buffer whitespace-help-buffer-name)
1854     (delete-other-windows)
1855     (let ((buffer (get-buffer-create whitespace-help-buffer-name)))
1856       (with-current-buffer buffer
1857         (erase-buffer)
1858         (insert whitespace-help-text)
1859         (whitespace-insert-option-mark
1860          whitespace-style-value-list style)
1861         (whitespace-display-window buffer)))))
1862
1863
1864 (defun whitespace-display-window (buffer)
1865   "Display BUFFER in a new window."
1866   (goto-char (point-min))
1867   (set-buffer-modified-p nil)
1868   (when (< (window-height) (* 2 window-min-height))
1869     (kill-buffer buffer)
1870     (error "Window height is too small; \
1871 can't split window to display whitespace toggle options"))
1872   (let ((win (split-window)))
1873     (set-window-buffer win buffer)
1874     (shrink-window-if-larger-than-buffer win)))
1875
1876
1877 (defun whitespace-kill-buffer (buffer-name)
1878   "Kill buffer BUFFER-NAME and windows related with it."
1879   (let ((buffer (get-buffer buffer-name)))
1880     (when buffer
1881       (delete-windows-on buffer)
1882       (kill-buffer buffer))))
1883
1884
1885 (defun whitespace-help-off ()
1886   "Remove the buffer and window of the whitespace toggle options."
1887   (whitespace-kill-buffer whitespace-help-buffer-name))
1888
1889
1890 (defun whitespace-help-scroll (&optional up)
1891   "Scroll help window, if it exists.
1892
1893 If UP is non-nil, scroll up; otherwise, scroll down."
1894   (condition-case nil
1895       (let ((buffer (get-buffer whitespace-help-buffer-name)))
1896         (if buffer
1897             (with-selected-window (get-buffer-window buffer)
1898               (if up
1899                   (scroll-up 3)
1900                 (scroll-down 3)))
1901           (ding)))
1902     ;; handler
1903     ((error)
1904      ;; just ignore error
1905      )))
1906
1907
1908 (defun whitespace-interactive-char (local-p)
1909   "Interactive function to read a char and return a symbol.
1910
1911 If LOCAL-P is non-nil, it uses a local context; otherwise, it
1912 uses a global context.
1913
1914 It accepts one of the following chars:
1915
1916   CHAR  MEANING
1917   (VIA FACES)
1918    f    toggle face visualization
1919    t    toggle TAB visualization
1920    s    toggle SPACE and HARD SPACE visualization
1921    r    toggle trailing blanks visualization
1922    l    toggle \"long lines\" visualization
1923    L    toggle \"long lines\" tail visualization
1924    n    toggle NEWLINE visualization
1925    e    toggle empty line at bob and/or eob visualization
1926    C-i  toggle indentation SPACEs visualization (via `indent-tabs-mode')
1927    I    toggle indentation SPACEs visualization
1928    i    toggle indentation TABs visualization
1929    C-a  toggle SPACEs after TAB visualization (via `indent-tabs-mode')
1930    A    toggle SPACEs after TAB: SPACEs visualization
1931    a    toggle SPACEs after TAB: TABs visualization
1932    C-b  toggle SPACEs before TAB visualization (via `indent-tabs-mode')
1933    B    toggle SPACEs before TAB: SPACEs visualization
1934    b    toggle SPACEs before TAB: TABs visualization
1935
1936   (VIA DISPLAY TABLE)
1937    T    toggle TAB visualization
1938    S    toggle SPACE and HARD SPACE visualization
1939    N    toggle NEWLINE visualization
1940
1941    x    restore `whitespace-style' value
1942    ?    display brief help
1943
1944 See also `whitespace-toggle-option-alist'."
1945   (let* ((is-off (not (if local-p
1946                           whitespace-mode
1947                         global-whitespace-mode)))
1948          (style  (cond (is-off  whitespace-style) ; use default value
1949                        (local-p whitespace-active-style)
1950                        (t       whitespace-toggle-style)))
1951          (prompt
1952           (format "Whitespace Toggle %s (type ? for further options)-"
1953                   (if local-p "Local" "Global")))
1954          ch sym)
1955     ;; read a valid option and get the corresponding symbol
1956     (save-window-excursion
1957       (condition-case data
1958           (progn
1959             (while
1960                 ;; while condition
1961                 (progn
1962                   (setq ch (read-char prompt))
1963                   (not
1964                    (setq sym
1965                          (cdr
1966                           (assq ch whitespace-toggle-option-alist)))))
1967               ;; while body
1968               (cond
1969                ((eq ch ?\?)   (whitespace-help-on style))
1970                ((eq ch ?\ )   (whitespace-help-scroll t))
1971                ((eq ch ?\M- ) (whitespace-help-scroll))
1972                ((eq ch ?>)    (whitespace-help-scroll t))
1973                ((eq ch ?<)    (whitespace-help-scroll))
1974                (t             (ding))))
1975             (whitespace-help-off)
1976             (message " "))              ; clean echo area
1977         ;; handler
1978         ((quit error)
1979          (whitespace-help-off)
1980          (error (error-message-string data)))))
1981     (list sym)))                        ; return the appropriate symbol
1982
1983
1984 (defun whitespace-toggle-list (local-p arg the-list)
1985   "Toggle options in THE-LIST based on list ARG.
1986
1987 If LOCAL-P is non-nil, it uses a local context; otherwise, it
1988 uses a global context.
1989
1990 ARG is a list of options to be toggled.
1991
1992 THE-LIST is a list of options.  This list will be toggled and the
1993 resultant list will be returned."
1994   (unless (if local-p whitespace-mode global-whitespace-mode)
1995     (setq the-list whitespace-style))
1996   (setq the-list (copy-sequence the-list)) ; keep original list
1997   (dolist (sym (if (listp arg) arg (list arg)))
1998     (cond
1999      ;; ignore help value
2000      ((eq sym 'help-newline))
2001      ;; restore default values
2002      ((eq sym 'whitespace-style)
2003       (setq the-list whitespace-style))
2004      ;; toggle valid values
2005      ((memq sym whitespace-style-value-list)
2006       (setq the-list (if (memq sym the-list)
2007                          (delq sym the-list)
2008                        (cons sym the-list))))))
2009   the-list)
2010
2011
2012 (defvar whitespace-display-table nil
2013   "Used to save a local display table.")
2014
2015 (defvar whitespace-display-table-was-local nil
2016   "Used to remember whether a buffer initially had a local display table.")
2017
2018 (defun whitespace-turn-on ()
2019   "Turn on whitespace visualization."
2020   ;; prepare local hooks
2021   (add-hook 'write-file-functions 'whitespace-write-file-hook nil t)
2022   ;; create whitespace local buffer environment
2023   (set (make-local-variable 'whitespace-font-lock-keywords) nil)
2024   (set (make-local-variable 'whitespace-display-table) nil)
2025   (set (make-local-variable 'whitespace-display-table-was-local) nil)
2026   (set (make-local-variable 'whitespace-active-style)
2027        (if (listp whitespace-style)
2028            whitespace-style
2029          (list whitespace-style)))
2030   (whitespace-ensure-local-variables)
2031   ;; turn on whitespace
2032   (when whitespace-active-style
2033     (whitespace-color-on)
2034     (whitespace-display-char-on)))
2035
2036
2037 (defun whitespace-turn-off ()
2038   "Turn off whitespace visualization."
2039   (remove-hook 'write-file-functions 'whitespace-write-file-hook t)
2040   (when whitespace-active-style
2041     (whitespace-color-off)
2042     (whitespace-display-char-off)))
2043
2044
2045 (defun whitespace-style-face-p ()
2046   "Return t if there is some visualization via face."
2047   (and (memq 'face whitespace-active-style)
2048        (or (memq 'tabs                    whitespace-active-style)
2049            (memq 'spaces                  whitespace-active-style)
2050            (memq 'trailing                whitespace-active-style)
2051            (memq 'lines                   whitespace-active-style)
2052            (memq 'lines-tail              whitespace-active-style)
2053            (memq 'newline                 whitespace-active-style)
2054            (memq 'empty                   whitespace-active-style)
2055            (memq 'indentation             whitespace-active-style)
2056            (memq 'indentation::tab        whitespace-active-style)
2057            (memq 'indentation::space      whitespace-active-style)
2058            (memq 'big-indent              whitespace-active-style)
2059            (memq 'space-after-tab         whitespace-active-style)
2060            (memq 'space-after-tab::tab    whitespace-active-style)
2061            (memq 'space-after-tab::space  whitespace-active-style)
2062            (memq 'space-before-tab        whitespace-active-style)
2063            (memq 'space-before-tab::tab   whitespace-active-style)
2064            (memq 'space-before-tab::space whitespace-active-style))))
2065
2066
2067 (defun whitespace-color-on ()
2068   "Turn on color visualization."
2069   (when (whitespace-style-face-p)
2070     ;; save current point and refontify when necessary
2071     (set (make-local-variable 'whitespace-point)
2072          (point))
2073     (setq whitespace-point--used
2074           (let ((ol (make-overlay (point) (point) nil nil t)))
2075             (delete-overlay ol) ol))
2076     (set (make-local-variable 'whitespace-font-lock-refontify)
2077          0)
2078     (set (make-local-variable 'whitespace-bob-marker)
2079          (point-min-marker))
2080     (set (make-local-variable 'whitespace-eob-marker)
2081          (point-max-marker))
2082     (set (make-local-variable 'whitespace-buffer-changed)
2083          nil)
2084     (add-hook 'post-command-hook #'whitespace-post-command-hook nil t)
2085     (add-hook 'before-change-functions #'whitespace-buffer-changed nil t)
2086     ;; Add whitespace-mode color into font lock.
2087     (setq
2088      whitespace-font-lock-keywords
2089      `(
2090        (whitespace-point--flush-used)
2091        ,@(when (memq 'spaces whitespace-active-style)
2092            ;; Show SPACEs.
2093            `((,whitespace-space-regexp 1 whitespace-space t)
2094              ;; Show HARD SPACEs.
2095              (,whitespace-hspace-regexp 1 whitespace-hspace t)))
2096        ,@(when (memq 'tabs whitespace-active-style)
2097            ;; Show TABs.
2098            `((,whitespace-tab-regexp 1 whitespace-tab t)))
2099        ,@(when (memq 'trailing whitespace-active-style)
2100            ;; Show trailing blanks.
2101            `((,#'whitespace-trailing-regexp 1 whitespace-trailing t)))
2102        ,@(when (or (memq 'lines      whitespace-active-style)
2103                    (memq 'lines-tail whitespace-active-style))
2104            ;; Show "long" lines.
2105            `((,(let ((line-column (or whitespace-line-column fill-column)))
2106                  (format
2107                   "^\\([^\t\n]\\{%s\\}\\|[^\t\n]\\{0,%s\\}\t\\)\\{%d\\}%s\\(.+\\)$"
2108                   whitespace-tab-width
2109                   (1- whitespace-tab-width)
2110                   (/ line-column whitespace-tab-width)
2111                   (let ((rem (% line-column whitespace-tab-width)))
2112                     (if (zerop rem)
2113                         ""
2114                       (format ".\\{%d\\}" rem)))))
2115               ,(if (memq 'lines whitespace-active-style)
2116                    0                    ; whole line
2117                  2)                     ; line tail
2118               whitespace-line prepend)))
2119        ,@(when (or (memq 'space-before-tab whitespace-active-style)
2120                    (memq 'space-before-tab::tab whitespace-active-style)
2121                    (memq 'space-before-tab::space whitespace-active-style))
2122            `((,whitespace-space-before-tab-regexp
2123               ,(cond
2124                 ((memq 'space-before-tab whitespace-active-style)
2125                  ;; Show SPACEs before TAB (indent-tabs-mode).
2126                  (if whitespace-indent-tabs-mode 1 2))
2127                 ((memq 'space-before-tab::tab whitespace-active-style)
2128                  1)
2129                 ((memq 'space-before-tab::space whitespace-active-style)
2130                  2))
2131               whitespace-space-before-tab t)))
2132        ,@(when (or (memq 'indentation whitespace-active-style)
2133                    (memq 'indentation::tab whitespace-active-style)
2134                    (memq 'indentation::space whitespace-active-style))
2135            `((,(cond
2136                 ((memq 'indentation whitespace-active-style)
2137                  ;; Show indentation SPACEs (indent-tabs-mode).
2138                  (whitespace-indentation-regexp))
2139                 ((memq 'indentation::tab whitespace-active-style)
2140                  ;; Show indentation SPACEs (SPACEs).
2141                  (whitespace-indentation-regexp 'tab))
2142                 ((memq 'indentation::space whitespace-active-style)
2143                  ;; Show indentation SPACEs (TABs).
2144                  (whitespace-indentation-regexp 'space)))
2145               1 whitespace-indentation t)))
2146        ,@(when (memq 'big-indent whitespace-active-style)
2147            ;; Show big indentation.
2148            `((,whitespace-big-indent-regexp 1 'whitespace-big-indent t)))
2149        ,@(when (memq 'empty whitespace-active-style)
2150            ;; Show empty lines at beginning of buffer.
2151            `((,#'whitespace-empty-at-bob-regexp
2152               1 whitespace-empty t)
2153              ;; Show empty lines at end of buffer.
2154              (,#'whitespace-empty-at-eob-regexp
2155               1 whitespace-empty t)))
2156        ,@(when (or (memq 'space-after-tab whitespace-active-style)
2157                    (memq 'space-after-tab::tab whitespace-active-style)
2158                    (memq 'space-after-tab::space whitespace-active-style))
2159            `((,(cond
2160                 ((memq 'space-after-tab whitespace-active-style)
2161                  ;; Show SPACEs after TAB (indent-tabs-mode).
2162                  (whitespace-space-after-tab-regexp))
2163                 ((memq 'space-after-tab::tab whitespace-active-style)
2164                  ;; Show SPACEs after TAB (SPACEs).
2165                  (whitespace-space-after-tab-regexp 'tab))
2166                 ((memq 'space-after-tab::space whitespace-active-style)
2167                  ;; Show SPACEs after TAB (TABs).
2168                  (whitespace-space-after-tab-regexp 'space)))
2169               1 whitespace-space-after-tab t)))))
2170     (font-lock-add-keywords nil whitespace-font-lock-keywords t)
2171     (font-lock-flush)))
2172
2173
2174 (defun whitespace-color-off ()
2175   "Turn off color visualization."
2176   ;; turn off font lock
2177   (kill-local-variable 'whitespace-point--used)
2178   (when (whitespace-style-face-p)
2179     (remove-hook 'post-command-hook #'whitespace-post-command-hook t)
2180     (remove-hook 'before-change-functions #'whitespace-buffer-changed t)
2181     (font-lock-remove-keywords nil whitespace-font-lock-keywords)
2182     (font-lock-flush)))
2183
2184 (defun whitespace-point--used (start end)
2185   (let ((ostart (overlay-start whitespace-point--used)))
2186     (if ostart
2187         (move-overlay whitespace-point--used
2188                       (min start ostart)
2189                       (max end (overlay-end whitespace-point--used)))
2190       (move-overlay whitespace-point--used start end))))
2191
2192 (defun whitespace-point--flush-used (limit)
2193   (let ((ostart (overlay-start whitespace-point--used)))
2194     ;; Strip parts of whitespace-point--used we're about to refresh.
2195     (when ostart
2196       (let ((oend (overlay-end whitespace-point--used)))
2197         (if (<= (point) ostart)
2198             (if (<= oend limit)
2199                 (delete-overlay whitespace-point--used)
2200               (move-overlay whitespace-point--used limit oend)))
2201         (if (<= oend limit)
2202             (move-overlay whitespace-point--used ostart (point))))))
2203   nil)
2204
2205 (defun whitespace-trailing-regexp (limit)
2206   "Match trailing spaces which do not contain the point at end of line."
2207   (let ((status t))
2208     (while (if (re-search-forward whitespace-trailing-regexp limit t)
2209                (when (= whitespace-point (match-end 1)) ; Loop if point at eol.
2210                  (whitespace-point--used (match-beginning 0) (match-end 0))
2211                  t)
2212              (setq status nil)))                  ;; end of buffer
2213     status))
2214
2215
2216 (defun whitespace-empty-at-bob-regexp (limit)
2217   "Match spaces at beginning of buffer which do not contain the point at \
2218 beginning of buffer."
2219   (let ((b (point))
2220         r)
2221     (cond
2222      ;; at bob
2223      ((= b 1)
2224       (setq r (and (looking-at whitespace-empty-at-bob-regexp)
2225                    (or (/= whitespace-point 1)
2226                        (progn (whitespace-point--used (match-beginning 0)
2227                                                       (match-end 0))
2228                               nil))))
2229       (set-marker whitespace-bob-marker (if r (match-end 1) b)))
2230      ;; inside bob empty region
2231      ((<= limit whitespace-bob-marker)
2232       (setq r (looking-at whitespace-empty-at-bob-regexp))
2233       (if r
2234           (when (< (match-end 1) limit)
2235             (set-marker whitespace-bob-marker (match-end 1)))
2236         (set-marker whitespace-bob-marker b)))
2237      ;; intersection with end of bob empty region
2238      ((<= b whitespace-bob-marker)
2239       (setq r (looking-at whitespace-empty-at-bob-regexp))
2240       (set-marker whitespace-bob-marker (if r (match-end 1) b)))
2241      ;; it is not inside bob empty region
2242      (t
2243       (setq r nil)))
2244     ;; move to end of matching
2245     (and r (goto-char (match-end 1)))
2246     r))
2247
2248
2249 (defsubst whitespace-looking-back (regexp limit)
2250   (save-excursion
2251     (when (/= 0 (skip-chars-backward " \t\n" limit))
2252       (unless (bolp)
2253         (forward-line 1))
2254       (looking-at regexp))))
2255
2256
2257 (defun whitespace-empty-at-eob-regexp (limit)
2258   "Match spaces at end of buffer which do not contain the point at end of \
2259 buffer."
2260   (let ((b (point))
2261         (e (1+ (buffer-size)))
2262         r)
2263     (cond
2264      ;; at eob
2265      ((= limit e)
2266       (goto-char limit)
2267       (setq r (whitespace-looking-back whitespace-empty-at-eob-regexp b))
2268       (when (and r (= whitespace-point e))
2269         (setq r nil)
2270         (whitespace-point--used (match-beginning 0) (match-end 0)))
2271       (if r
2272           (set-marker whitespace-eob-marker (match-beginning 1))
2273         (set-marker whitespace-eob-marker limit)
2274         (goto-char b)))                 ; return back to initial position
2275      ;; inside eob empty region
2276      ((>= b whitespace-eob-marker)
2277       (goto-char limit)
2278       (setq r (whitespace-looking-back whitespace-empty-at-eob-regexp b))
2279       (if r
2280           (when (> (match-beginning 1) b)
2281             (set-marker whitespace-eob-marker (match-beginning 1)))
2282         (set-marker whitespace-eob-marker limit)
2283         (goto-char b)))                 ; return back to initial position
2284      ;; intersection with beginning of eob empty region
2285      ((>= limit whitespace-eob-marker)
2286       (goto-char limit)
2287       (setq r (whitespace-looking-back whitespace-empty-at-eob-regexp b))
2288       (if r
2289           (set-marker whitespace-eob-marker (match-beginning 1))
2290         (set-marker whitespace-eob-marker limit)
2291         (goto-char b)))                 ; return back to initial position
2292      ;; it is not inside eob empty region
2293      (t
2294       (setq r nil)))
2295     r))
2296
2297
2298 (defun whitespace-buffer-changed (_beg _end)
2299   "Set `whitespace-buffer-changed' variable to t."
2300   (setq whitespace-buffer-changed t))
2301
2302
2303 (defun whitespace-post-command-hook ()
2304   "Save current point into `whitespace-point' variable.
2305 Also refontify when necessary."
2306   (unless (and (eq whitespace-point (point))
2307                (not whitespace-buffer-changed))
2308     (setq whitespace-point (point))     ; current point position
2309     (let ((refontify
2310            (cond
2311             ;; It is at end of buffer (eob).
2312             ((= whitespace-point (1+ (buffer-size)))
2313              (when (whitespace-looking-back whitespace-empty-at-eob-regexp
2314                                             nil)
2315                (match-beginning 0)))
2316             ;; It is at end of line ...
2317             ((and (eolp)
2318                   ;; ... with trailing SPACE or TAB
2319                   (or (memq (preceding-char) '(?\s ?\t))))
2320              (line-beginning-position))
2321             ;; It is at beginning of buffer (bob).
2322             ((and (= whitespace-point 1)
2323                   (looking-at whitespace-empty-at-bob-regexp))
2324              (match-end 0))))
2325           (ostart (overlay-start whitespace-point--used)))
2326       (cond
2327        ((not refontify)
2328         ;; New point does not affect highlighting: just refresh the
2329         ;; highlighting of old point, if needed.
2330         (when ostart
2331           (font-lock-flush ostart
2332                            (overlay-end whitespace-point--used))
2333           (delete-overlay whitespace-point--used)))
2334        ((not ostart)
2335         ;; Old point did not affect highlighting, but new one does: refresh the
2336         ;; highlighting of new point.
2337         (font-lock-flush (min refontify (point)) (max refontify (point))))
2338        ((save-excursion
2339           (goto-char ostart)
2340           (setq ostart (line-beginning-position))
2341           (and (<= ostart (max refontify (point)))
2342                (progn
2343                  (goto-char (overlay-end whitespace-point--used))
2344                  (let ((oend (line-beginning-position 2)))
2345                    (<= (min refontify (point)) oend)))))
2346         ;; The old point highlighting and the new point highlighting
2347         ;; cover a contiguous region: do a single refresh.
2348         (font-lock-flush (min refontify (point) ostart)
2349                          (max refontify (point)
2350                               (overlay-end whitespace-point--used)))
2351         (delete-overlay whitespace-point--used))
2352        (t
2353         (font-lock-flush (min refontify (point))
2354                          (max refontify (point)))
2355         (font-lock-flush ostart (overlay-end whitespace-point--used))
2356         (delete-overlay whitespace-point--used))))))
2357
2358 \f
2359 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2360 ;;;; Hacked from visws.el (Miles Bader <miles@gnu.org>)
2361
2362
2363 (defun whitespace-style-mark-p ()
2364   "Return t if there is some visualization via display table."
2365   (or (memq 'tab-mark     whitespace-active-style)
2366       (memq 'space-mark   whitespace-active-style)
2367       (memq 'newline-mark whitespace-active-style)))
2368
2369
2370 (defsubst whitespace-char-valid-p (char)
2371   ;; This check should be improved!!!
2372   (or (< char 256)
2373       (characterp char)))
2374
2375
2376 (defun whitespace-display-vector-p (vec)
2377   "Return true if every character in vector VEC can be displayed."
2378   (let ((i (length vec)))
2379     (when (> i 0)
2380       (while (and (>= (setq i (1- i)) 0)
2381                   (whitespace-char-valid-p (aref vec i))))
2382       (< i 0))))
2383
2384
2385 (defun whitespace-display-char-on ()
2386   "Turn on character display mapping."
2387   (when (and whitespace-display-mappings
2388              (whitespace-style-mark-p))
2389     (let (vecs vec)
2390       ;; Remember whether a buffer has a local display table.
2391       (unless whitespace-display-table-was-local
2392         (setq whitespace-display-table-was-local t
2393               whitespace-display-table
2394               (copy-sequence buffer-display-table))
2395         ;; Assure `buffer-display-table' is unique
2396         ;; when two or more windows are visible.
2397         (setq buffer-display-table
2398               (copy-sequence buffer-display-table)))
2399       (unless buffer-display-table
2400         (setq buffer-display-table (make-display-table)))
2401       (dolist (entry whitespace-display-mappings)
2402         ;; check if it is to display this mark
2403         (when (memq (car entry) whitespace-style)
2404           ;; Get a displayable mapping.
2405           (setq vecs (cddr entry))
2406           (while (and vecs
2407                       (not (whitespace-display-vector-p (car vecs))))
2408             (setq vecs (cdr vecs)))
2409           ;; Display a valid mapping.
2410           (when vecs
2411             (setq vec (copy-sequence (car vecs)))
2412             ;; NEWLINE char
2413             (when (and (eq (cadr entry) ?\n)
2414                        (memq 'newline whitespace-active-style))
2415               ;; Only insert face bits on NEWLINE char mapping to avoid
2416               ;; obstruction of other faces like TABs and (HARD) SPACEs
2417               ;; faces, font-lock faces, etc.
2418               (dotimes (i (length vec))
2419                 (or (eq (aref vec i) ?\n)
2420                     (aset vec i
2421                           (make-glyph-code (aref vec i)
2422                                            whitespace-newline)))))
2423             ;; Display mapping
2424             (aset buffer-display-table (cadr entry) vec)))))))
2425
2426
2427 (defun whitespace-display-char-off ()
2428   "Turn off character display mapping."
2429   (and whitespace-display-mappings
2430        (whitespace-style-mark-p)
2431        whitespace-display-table-was-local
2432        (setq whitespace-display-table-was-local nil
2433              buffer-display-table whitespace-display-table)))
2434
2435 \f
2436 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2437 ;;;; Hook
2438
2439
2440 (defun whitespace-action-when-on ()
2441   "Action to be taken always when local whitespace is turned on."
2442   (cond ((memq 'cleanup whitespace-action)
2443          (whitespace-cleanup))
2444         ((memq 'report-on-bogus whitespace-action)
2445          (whitespace-report nil t))))
2446
2447
2448 (defun whitespace-write-file-hook ()
2449   "Action to be taken when buffer is written.
2450 It should be added buffer-locally to `write-file-functions'."
2451   (cond ((memq 'auto-cleanup whitespace-action)
2452          (whitespace-cleanup))
2453         ((memq 'abort-on-bogus whitespace-action)
2454          (when (whitespace-report nil t)
2455            (error "Abort write due to whitespace problems in %s"
2456                   (buffer-name)))))
2457   nil)                                  ; continue hook processing
2458
2459
2460 (defun whitespace-warn-read-only (msg)
2461   "Warn if buffer is read-only."
2462   (when (memq 'warn-if-read-only whitespace-action)
2463     (message "Can't %s: %s is read-only" msg (buffer-name))))
2464
2465 \f
2466 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2467
2468
2469 (defun whitespace-unload-function ()
2470   "Unload the whitespace library."
2471   (global-whitespace-mode -1)
2472   ;; be sure all local whitespace mode is turned off
2473   (save-current-buffer
2474     (dolist (buf (buffer-list))
2475       (set-buffer buf)
2476       (whitespace-mode -1)))
2477   nil)                                  ; continue standard unloading
2478
2479
2480 (provide 'whitespace)
2481
2482
2483 (run-hooks 'whitespace-load-hook)
2484
2485
2486 ;;; whitespace.el ends here