lisp/hi-lock.el

   1 ;;; hi-lock.el --- minor mode for interactive automatic highlighting
   2
   3 ;; Copyright (C) 2000-2011 Free Software Foundation, Inc.
   4
   5 ;; Author: David M. Koppelman <koppel@ece.lsu.edu>
   6 ;; Keywords: faces, minor-mode, matching, display
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24 ;;
  25 ;;  With the hi-lock commands text matching interactively entered
  26 ;;  regexp's can be highlighted.  For example, `M-x highlight-regexp
  27 ;;  RET clearly RET RET' will highlight all occurrences of `clearly'
  28 ;;  using a yellow background face.  New occurrences of `clearly' will
  29 ;;  be highlighted as they are typed.  `M-x unhighlight-regexp RET'
  30 ;;  will remove the highlighting.  Any existing face can be used for
  31 ;;  highlighting and a set of appropriate faces is provided.  The
  32 ;;  regexps can be written into the current buffer in a form that will
  33 ;;  be recognized the next time the corresponding file is read (when
  34 ;;  file patterns is turned on).
  35 ;;
  36 ;;  Applications:
  37 ;;
  38 ;;    In program source code highlight a variable to quickly see all
  39 ;;    places it is modified or referenced:
  40 ;;    M-x highlight-regexp ground_contact_switches_closed RET RET
  41 ;;
  42 ;;    In a shell or other buffer that is showing lots of program
  43 ;;    output, highlight the parts of the output you're interested in:
  44 ;;    M-x highlight-regexp Total execution time [0-9]+ RET hi-blue-b RET
  45 ;;
  46 ;;    In buffers displaying tables, highlight the lines you're interested in:
  47 ;;    M-x highlight-lines-matching-regexp January 2000 RET hi-black-b RET
  48 ;;
  49 ;;    When writing text, highlight personal cliches.  This can be
  50 ;;    amusing.
  51 ;;    M-x highlight-phrase as can be seen RET RET
  52 ;;
  53 ;;  Setup:
  54 ;;
  55 ;;    Put the following code in your .emacs file.  This turns on
  56 ;;    hi-lock mode and adds a "Regexp Highlighting" entry
  57 ;;    to the edit menu.
  58 ;;
  59 ;;    (global-hi-lock-mode 1)
  60 ;;
  61 ;;    To enable the use of patterns found in files (presumably placed
  62 ;;    there by hi-lock) include the following in your .emacs file:
  63 ;;
  64 ;;    (setq hi-lock-file-patterns-policy 'ask)
  65 ;;
  66 ;;    If you get tired of being asked each time a file is loaded replace
  67 ;;    `ask' with a function that returns t if patterns should be read.
  68 ;;
  69 ;;    You might also want to bind the hi-lock commands to more
  70 ;;    finger-friendly sequences:
  71
  72 ;;    (define-key hi-lock-map "\C-z\C-h" 'highlight-lines-matching-regexp)
  73 ;;    (define-key hi-lock-map "\C-zi" 'hi-lock-find-patterns)
  74 ;;    (define-key hi-lock-map "\C-zh" 'highlight-regexp)
  75 ;;    (define-key hi-lock-map "\C-zp" 'highlight-phrase)
  76 ;;    (define-key hi-lock-map "\C-zr" 'unhighlight-regexp)
  77 ;;    (define-key hi-lock-map "\C-zb" 'hi-lock-write-interactive-patterns))
  78
  79 ;;    See the documentation for hi-lock-mode `C-h f hi-lock-mode' for
  80 ;;    additional instructions.
  81
  82 ;; Sample file patterns:
  83
  84 ; Hi-lock: (("^;;; .*" (0 (quote hi-black-hb) t)))
  85 ; Hi-lock: ( ("make-variable-buffer-\\(local\\)" (0 font-lock-keyword-face)(1 'italic append)))))
  86 ; Hi-lock: end
  87
  88 ;;; Code:
  89
  90 (require 'font-lock)
  91
  92 (defgroup hi-lock nil
  93   "Interactively add and remove font-lock patterns for highlighting text."
  94   :link '(custom-manual "(emacs)Highlight Interactively")
  95   :group 'font-lock)
  96
  97 (defcustom hi-lock-file-patterns-range 10000
  98   "Limit of search in a buffer for hi-lock patterns.
  99 When a file is visited and hi-lock mode is on, patterns starting
 100 up to this limit are added to font-lock's patterns.  See documentation
 101 of functions `hi-lock-mode' and `hi-lock-find-patterns'."
 102   :type 'integer
 103   :group 'hi-lock)
 104
 105 (defcustom hi-lock-highlight-range 200000
 106   "Size of area highlighted by hi-lock when font-lock not active.
 107 Font-lock is not active in buffers that do their own highlighting,
 108 such as the buffer created by `list-colors-display'.  In those buffers
 109 hi-lock patterns will only be applied over a range of
 110 `hi-lock-highlight-range' characters.  If font-lock is active then
 111 highlighting will be applied throughout the buffer."
 112   :type 'integer
 113   :group 'hi-lock)
 114
 115 (defcustom hi-lock-exclude-modes
 116   '(rmail-mode mime/viewer-mode gnus-article-mode)
 117   "List of major modes in which hi-lock will not run.
 118 For security reasons since font lock patterns can specify function
 119 calls."
 120   :type '(repeat symbol)
 121   :group 'hi-lock)
 122
 123 (defcustom hi-lock-file-patterns-policy 'ask
 124   "Specify when hi-lock should use patterns found in file.
 125 If `ask', prompt when patterns found in buffer; if bound to a function,
 126 use patterns when function returns t (function is called with patterns
 127 as first argument); if nil or `never' or anything else, don't use file
 128 patterns."
 129   :type '(choice (const :tag "Do not use file patterns" never)
 130                  (const :tag "Ask about file patterns" ask)
 131                  (function :tag "Function to check file patterns"))
 132   :group 'hi-lock
 133   :version "22.1")
 134
 135 ;; It can have a function value.
 136 (put 'hi-lock-file-patterns-policy 'risky-local-variable t)
 137
 138 (defgroup hi-lock-faces nil
 139   "Faces for hi-lock."
 140   :group 'hi-lock
 141   :group 'faces)
 142
 143 (defface hi-yellow
 144   '((((min-colors 88) (background dark))
 145      (:background "yellow1" :foreground "black"))
 146     (((background dark)) (:background "yellow" :foreground "black"))
 147     (((min-colors 88)) (:background "yellow1"))
 148     (t (:background "yellow")))
 149   "Default face for hi-lock mode."
 150   :group 'hi-lock-faces)
 151
 152 (defface hi-pink
 153   '((((background dark)) (:background "pink" :foreground "black"))
 154     (t (:background "pink")))
 155   "Face for hi-lock mode."
 156   :group 'hi-lock-faces)
 157
 158 (defface hi-green
 159   '((((min-colors 88) (background dark))
 160      (:background "green1" :foreground "black"))
 161     (((background dark)) (:background "green" :foreground "black"))
 162     (((min-colors 88)) (:background "green1"))
 163     (t (:background "green")))
 164   "Face for hi-lock mode."
 165   :group 'hi-lock-faces)
 166
 167 (defface hi-blue
 168   '((((background dark)) (:background "light blue" :foreground "black"))
 169     (t (:background "light blue")))
 170   "Face for hi-lock mode."
 171   :group 'hi-lock-faces)
 172
 173 (defface hi-black-b
 174   '((t (:weight bold)))
 175   "Face for hi-lock mode."
 176   :group 'hi-lock-faces)
 177
 178 (defface hi-blue-b
 179   '((((min-colors 88)) (:weight bold :foreground "blue1"))
 180     (t (:weight bold :foreground "blue")))
 181   "Face for hi-lock mode."
 182   :group 'hi-lock-faces)
 183
 184 (defface hi-green-b
 185   '((((min-colors 88)) (:weight bold :foreground "green1"))
 186     (t (:weight bold :foreground "green")))
 187   "Face for hi-lock mode."
 188   :group 'hi-lock-faces)
 189
 190 (defface hi-red-b
 191   '((((min-colors 88)) (:weight bold :foreground "red1"))
 192     (t (:weight bold :foreground "red")))
 193   "Face for hi-lock mode."
 194   :group 'hi-lock-faces)
 195
 196 (defface hi-black-hb
 197   '((t (:weight bold :height 1.67 :inherit variable-pitch)))
 198   "Face for hi-lock mode."
 199   :group 'hi-lock-faces)
 200
 201 (defvar hi-lock-file-patterns nil
 202   "Patterns found in file for hi-lock.  Should not be changed.")
 203
 204 (defvar hi-lock-interactive-patterns nil
 205   "Patterns provided to hi-lock by user.  Should not be changed.")
 206
 207 (defvar hi-lock-face-defaults
 208   '("hi-yellow" "hi-pink" "hi-green" "hi-blue" "hi-black-b"
 209     "hi-blue-b" "hi-red-b" "hi-green-b" "hi-black-hb")
 210   "Default faces for hi-lock interactive functions.")
 211
 212 ;(dolist (f hi-lock-face-defaults) (unless (facep f) (error "%s not a face" f)))
 213
 214 (define-obsolete-variable-alias 'hi-lock-face-history
 215                                 'hi-lock-face-defaults
 216                                 "23.1")
 217
 218 (define-obsolete-variable-alias 'hi-lock-regexp-history
 219                                 'regexp-history
 220                                 "23.1")
 221
 222 (defvar hi-lock-file-patterns-prefix "Hi-lock"
 223   "Search target for finding hi-lock patterns at top of file.")
 224
 225 (defvar hi-lock-archaic-interface-message-used nil
 226   "True if user alerted that `global-hi-lock-mode' is now the global switch.
 227 Earlier versions of hi-lock used `hi-lock-mode' as the global switch;
 228 the message is issued if it appears that `hi-lock-mode' is used assuming
 229 that older functionality.  This variable avoids multiple reminders.")
 230
 231 (defvar hi-lock-archaic-interface-deduce nil
 232   "If non-nil, sometimes assume that `hi-lock-mode' means `global-hi-lock-mode'.
 233 Assumption is made if `hi-lock-mode' used in the *scratch* buffer while
 234 a library is being loaded.")
 235
 236 (make-variable-buffer-local 'hi-lock-interactive-patterns)
 237 (put 'hi-lock-interactive-patterns 'permanent-local t)
 238 (make-variable-buffer-local 'hi-lock-file-patterns)
 239 (put 'hi-lock-file-patterns 'permanent-local t)
 240
 241 (defvar hi-lock-menu
 242   (let ((map (make-sparse-keymap "Hi Lock")))
 243     (define-key-after map [highlight-regexp]
 244       '(menu-item "Highlight Regexp..." highlight-regexp
 245         :help "Highlight text matching PATTERN (a regexp)."))
 246
 247     (define-key-after map [highlight-phrase]
 248       '(menu-item "Highlight Phrase..." highlight-phrase
 249         :help "Highlight text matching PATTERN (a regexp processed to match phrases)."))
 250
 251     (define-key-after map [highlight-lines-matching-regexp]
 252       '(menu-item "Highlight Lines..." highlight-lines-matching-regexp
 253         :help "Highlight lines containing match of PATTERN (a regexp)."))
 254
 255     (define-key-after map [unhighlight-regexp]
 256       '(menu-item "Remove Highlighting..." unhighlight-regexp
 257         :help "Remove previously entered highlighting pattern."
 258         :enable hi-lock-interactive-patterns))
 259
 260     (define-key-after map [hi-lock-write-interactive-patterns]
 261       '(menu-item "Patterns to Buffer" hi-lock-write-interactive-patterns
 262         :help "Insert interactively added REGEXPs into buffer at point."
 263         :enable hi-lock-interactive-patterns))
 264
 265     (define-key-after map [hi-lock-find-patterns]
 266       '(menu-item "Patterns from Buffer" hi-lock-find-patterns
 267         :help "Use patterns (if any) near top of buffer."))
 268     map)
 269   "Menu for hi-lock mode.")
 270
 271 (defvar hi-lock-map
 272   (let ((map (make-sparse-keymap "Hi Lock")))
 273     (define-key map "\C-xwi" 'hi-lock-find-patterns)
 274     (define-key map "\C-xwl" 'highlight-lines-matching-regexp)
 275     (define-key map "\C-xwp" 'highlight-phrase)
 276     (define-key map "\C-xwh" 'highlight-regexp)
 277     (define-key map "\C-xwr" 'unhighlight-regexp)
 278     (define-key map "\C-xwb" 'hi-lock-write-interactive-patterns)
 279     map)
 280   "Key map for hi-lock.")
 281
 282 ;; Visible Functions
 283
 284 ;;;###autoload
 285 (define-minor-mode hi-lock-mode
 286   "Toggle selective highlighting of patterns (Hi Lock mode).
 287 With a prefix argument ARG, enable Hi Lock mode if ARG is
 288 positive, and disable it otherwise.  If called from Lisp, enable
 289 the mode if ARG is omitted or nil.
 290
 291 Issuing one the highlighting commands listed below will
 292 automatically enable Hi Lock mode.  To enable Hi Lock mode in all
 293 buffers, use `global-hi-lock-mode' or add (global-hi-lock-mode 1)
 294 to your init file.  When Hi Lock mode is enabled, a \"Regexp
 295 Highlighting\" submenu is added to the \"Edit\" menu.  The
 296 commands in the submenu, which can be called interactively, are:
 297
 298 \\[highlight-regexp] REGEXP FACE
 299   Highlight matches of pattern REGEXP in current buffer with FACE.
 300
 301 \\[highlight-phrase] PHRASE FACE
 302   Highlight matches of phrase PHRASE in current buffer with FACE.
 303   (PHRASE can be any REGEXP, but spaces will be replaced by matches
 304   to whitespace and initial lower-case letters will become case insensitive.)
 305
 306 \\[highlight-lines-matching-regexp] REGEXP FACE
 307   Highlight lines containing matches of REGEXP in current buffer with FACE.
 308
 309 \\[unhighlight-regexp] REGEXP
 310   Remove highlighting on matches of REGEXP in current buffer.
 311
 312 \\[hi-lock-write-interactive-patterns]
 313   Write active REGEXPs into buffer as comments (if possible).  They may
 314   be read the next time file is loaded or when the \\[hi-lock-find-patterns] command
 315   is issued.  The inserted regexps are in the form of font lock keywords.
 316   (See `font-lock-keywords'.)  They may be edited and re-loaded with \\[hi-lock-find-patterns],
 317   any valid `font-lock-keywords' form is acceptable.  When a file is
 318   loaded the patterns are read if `hi-lock-file-patterns-policy' is
 319   'ask and the user responds y to the prompt, or if
 320   `hi-lock-file-patterns-policy' is bound to a function and that
 321   function returns t.
 322
 323 \\[hi-lock-find-patterns]
 324   Re-read patterns stored in buffer (in the format produced by \\[hi-lock-write-interactive-patterns]).
 325
 326 When hi-lock is started and if the mode is not excluded or patterns
 327 rejected, the beginning of the buffer is searched for lines of the
 328 form:
 329   Hi-lock: FOO
 330 where FOO is a list of patterns.  These are added to the font lock
 331 keywords already present.  The patterns must start before position
 332 \(number of characters into buffer) `hi-lock-file-patterns-range'.
 333 Patterns will be read until
 334  Hi-lock: end
 335 is found.  A mode is excluded if it's in the list `hi-lock-exclude-modes'."
 336   :group 'hi-lock
 337   :lighter (:eval (if (or hi-lock-interactive-patterns
 338                           hi-lock-file-patterns)
 339                       " Hi" ""))
 340   :global nil
 341   :keymap hi-lock-map
 342   (when (and (equal (buffer-name) "*scratch*")
 343              load-in-progress
 344              (not (called-interactively-p 'interactive))
 345              (not hi-lock-archaic-interface-message-used))
 346     (setq hi-lock-archaic-interface-message-used t)
 347     (if hi-lock-archaic-interface-deduce
 348         (global-hi-lock-mode hi-lock-mode)
 349       (warn
 350        "Possible archaic use of (hi-lock-mode).
 351 Use (global-hi-lock-mode 1) in .emacs to enable hi-lock for all buffers,
 352 use (hi-lock-mode 1) for individual buffers.  For compatibility with Emacs
 353 versions before 22 use the following in your .emacs file:
 354
 355         (if (functionp 'global-hi-lock-mode)
 356             (global-hi-lock-mode 1)
 357           (hi-lock-mode 1))
 358 ")))
 359   (if hi-lock-mode
 360       ;; Turned on.
 361       (progn
 362         (unless font-lock-mode (font-lock-mode 1))
 363         (define-key-after menu-bar-edit-menu [hi-lock]
 364           (cons "Regexp Highlighting" hi-lock-menu))
 365         (hi-lock-find-patterns)
 366         (add-hook 'font-lock-mode-hook 'hi-lock-font-lock-hook nil t))
 367     ;; Turned off.
 368     (when (or hi-lock-interactive-patterns
 369               hi-lock-file-patterns)
 370       (when hi-lock-interactive-patterns
 371         (font-lock-remove-keywords nil hi-lock-interactive-patterns)
 372         (setq hi-lock-interactive-patterns nil))
 373       (when hi-lock-file-patterns
 374         (font-lock-remove-keywords nil hi-lock-file-patterns)
 375         (setq hi-lock-file-patterns nil))
 376       (remove-overlays nil nil 'hi-lock-overlay t)
 377       (when font-lock-fontified (font-lock-fontify-buffer)))
 378     (define-key-after menu-bar-edit-menu [hi-lock] nil)
 379     (remove-hook 'font-lock-mode-hook 'hi-lock-font-lock-hook t)))
 380
 381 ;;;###autoload
 382 (define-globalized-minor-mode global-hi-lock-mode
 383   hi-lock-mode turn-on-hi-lock-if-enabled
 384   :group 'hi-lock)
 385
 386 (defun turn-on-hi-lock-if-enabled ()
 387   (setq hi-lock-archaic-interface-message-used t)
 388   (unless (memq major-mode hi-lock-exclude-modes)
 389     (hi-lock-mode 1)))
 390
 391 ;;;###autoload
 392 (defalias 'highlight-lines-matching-regexp 'hi-lock-line-face-buffer)
 393 ;;;###autoload
 394 (defun hi-lock-line-face-buffer (regexp &optional face)
 395   "Set face of all lines containing a match of REGEXP to FACE.
 396
 397 Interactively, prompt for REGEXP then FACE.  Buffer-local history
 398 list maintained for regexps, global history maintained for faces.
 399 \\<minibuffer-local-map>Use \\[previous-history-element] to retrieve previous history items,
 400 and \\[next-history-element] to retrieve default values.
 401 \(See info node `Minibuffer History'.)"
 402   (interactive
 403    (list
 404     (hi-lock-regexp-okay
 405      (read-regexp "Regexp to highlight line" (car regexp-history)))
 406     (hi-lock-read-face-name)))
 407   (or (facep face) (setq face 'hi-yellow))
 408   (unless hi-lock-mode (hi-lock-mode 1))
 409   (hi-lock-set-pattern
 410    ;; The \\(?:...\\) grouping construct ensures that a leading ^, +, * or ?
 411    ;; or a trailing $ in REGEXP will be interpreted correctly.
 412    (concat "^.*\\(?:" regexp "\\).*$") face))
 413
 414
 415 ;;;###autoload
 416 (defalias 'highlight-regexp 'hi-lock-face-buffer)
 417 ;;;###autoload
 418 (defun hi-lock-face-buffer (regexp &optional face)
 419   "Set face of each match of REGEXP to FACE.
 420
 421 Interactively, prompt for REGEXP then FACE.  Buffer-local history
 422 list maintained for regexps, global history maintained for faces.
 423 \\<minibuffer-local-map>Use \\[previous-history-element] to retrieve previous history items,
 424 and \\[next-history-element] to retrieve default values.
 425 \(See info node `Minibuffer History'.)"
 426   (interactive
 427    (list
 428     (hi-lock-regexp-okay
 429      (read-regexp "Regexp to highlight" (car regexp-history)))
 430     (hi-lock-read-face-name)))
 431   (or (facep face) (setq face 'hi-yellow))
 432   (unless hi-lock-mode (hi-lock-mode 1))
 433   (hi-lock-set-pattern regexp face))
 434
 435 ;;;###autoload
 436 (defalias 'highlight-phrase 'hi-lock-face-phrase-buffer)
 437 ;;;###autoload
 438 (defun hi-lock-face-phrase-buffer (regexp &optional face)
 439   "Set face of each match of phrase REGEXP to FACE.
 440
 441 Whitespace in REGEXP converted to arbitrary whitespace and initial
 442 lower-case letters made case insensitive."
 443   (interactive
 444    (list
 445     (hi-lock-regexp-okay
 446      (hi-lock-process-phrase
 447       (read-regexp "Phrase to highlight" (car regexp-history))))
 448     (hi-lock-read-face-name)))
 449   (or (facep face) (setq face 'hi-yellow))
 450   (unless hi-lock-mode (hi-lock-mode 1))
 451   (hi-lock-set-pattern regexp face))
 452
 453 (declare-function x-popup-menu "menu.c" (position menu))
 454
 455 ;;;###autoload
 456 (defalias 'unhighlight-regexp 'hi-lock-unface-buffer)
 457 ;;;###autoload
 458 (defun hi-lock-unface-buffer (regexp)
 459   "Remove highlighting of each match to REGEXP set by hi-lock.
 460
 461 Interactively, prompt for REGEXP.  Buffer-local history of inserted
 462 regexp's maintained.  Will accept only regexps inserted by hi-lock
 463 interactive functions.  \(See `hi-lock-interactive-patterns'.\)
 464 \\<minibuffer-local-must-match-map>Use \\[minibuffer-complete] to complete a partially typed regexp.
 465 \(See info node `Minibuffer History'.\)"
 466   (interactive
 467    (if (and (display-popup-menus-p)
 468             (listp last-nonmenu-event)
 469             use-dialog-box)
 470        (catch 'snafu
 471          (or
 472           (x-popup-menu
 473            t
 474            (cons
 475             `keymap
 476             (cons "Select Pattern to Unhighlight"
 477                   (mapcar (lambda (pattern)
 478                             (list (car pattern)
 479                                   (format
 480                                    "%s (%s)" (car pattern)
 481                                    (symbol-name
 482                                     (car
 483                                      (cdr (car (cdr (car (cdr pattern))))))))
 484                                   (cons nil nil)
 485                                   (car pattern)))
 486                           hi-lock-interactive-patterns))))
 487           ;; If the user clicks outside the menu, meaning that they
 488           ;; change their mind, x-popup-menu returns nil, and
 489           ;; interactive signals a wrong number of arguments error.
 490           ;; To prevent that, we return an empty string, which will
 491           ;; effectively disable the rest of the function.
 492           (throw 'snafu '(""))))
 493      (let ((history-list (mapcar (lambda (p) (car p))
 494                                  hi-lock-interactive-patterns)))
 495        (unless hi-lock-interactive-patterns
 496          (error "No highlighting to remove"))
 497        (list
 498         (completing-read "Regexp to unhighlight: "
 499                          hi-lock-interactive-patterns nil t
 500                          (car (car hi-lock-interactive-patterns))
 501                          (cons 'history-list 1))))))
 502   (let ((keyword (assoc regexp hi-lock-interactive-patterns)))
 503     (when keyword
 504       (font-lock-remove-keywords nil (list keyword))
 505       (setq hi-lock-interactive-patterns
 506             (delq keyword hi-lock-interactive-patterns))
 507       (remove-overlays
 508        nil nil 'hi-lock-overlay-regexp (hi-lock-string-serialize regexp))
 509       (when font-lock-fontified (font-lock-fontify-buffer)))))
 510
 511 ;;;###autoload
 512 (defun hi-lock-write-interactive-patterns ()
 513   "Write interactively added patterns, if any, into buffer at point.
 514
 515 Interactively added patterns are those normally specified using
 516 `highlight-regexp' and `highlight-lines-matching-regexp'; they can
 517 be found in variable `hi-lock-interactive-patterns'."
 518   (interactive)
 519   (if (null hi-lock-interactive-patterns)
 520       (error "There are no interactive patterns"))
 521   (let ((beg (point)))
 522     (mapc
 523      (lambda (pattern)
 524        (insert (format "%s: (%s)\n"
 525                        hi-lock-file-patterns-prefix
 526                        (prin1-to-string pattern))))
 527      hi-lock-interactive-patterns)
 528     (comment-region beg (point)))
 529   (when (> (point) hi-lock-file-patterns-range)
 530     (warn "Inserted keywords not close enough to top of file")))
 531
 532 ;; Implementation Functions
 533
 534 (defun hi-lock-process-phrase (phrase)
 535   "Convert regexp PHRASE to a regexp that matches phrases.
 536
 537 Blanks in PHRASE replaced by regexp that matches arbitrary whitespace
 538 and initial lower-case letters made case insensitive."
 539   (let ((mod-phrase nil))
 540     (setq mod-phrase
 541           (replace-regexp-in-string
 542            "\\<[a-z]" (lambda (m) (format "[%s%s]" (upcase m) m)) phrase))
 543     (setq mod-phrase
 544           (replace-regexp-in-string
 545            "\\s-+" "[ \t\n]+" mod-phrase nil t))))
 546
 547 (defun hi-lock-regexp-okay (regexp)
 548   "Return REGEXP if it appears suitable for a font-lock pattern.
 549
 550 Otherwise signal an error.  A pattern that matches the null string is
 551 not suitable."
 552   (if (string-match regexp "")
 553       (error "Regexp cannot match an empty string")
 554     regexp))
 555
 556 (defun hi-lock-read-face-name ()
 557   "Read face name from minibuffer with completion and history."
 558   (intern (completing-read
 559            "Highlight using face: "
 560            obarray 'facep t
 561            (cons (car hi-lock-face-defaults)
 562                  (let ((prefix
 563                         (try-completion
 564                          (substring (car hi-lock-face-defaults) 0 1)
 565                          hi-lock-face-defaults)))
 566                    (if (and (stringp prefix)
 567                             (not (equal prefix (car hi-lock-face-defaults))))
 568                        (length prefix) 0)))
 569            'face-name-history
 570            (cdr hi-lock-face-defaults))))
 571
 572 (defun hi-lock-set-pattern (regexp face)
 573   "Highlight REGEXP with face FACE."
 574   (let ((pattern (list regexp (list 0 (list 'quote face) t))))
 575     (unless (member pattern hi-lock-interactive-patterns)
 576       (push pattern hi-lock-interactive-patterns)
 577       (if font-lock-fontified
 578           (progn
 579             (font-lock-add-keywords nil (list pattern) t)
 580             (font-lock-fontify-buffer))
 581         (let* ((serial (hi-lock-string-serialize regexp))
 582                (range-min (- (point) (/ hi-lock-highlight-range 2)))
 583                (range-max (+ (point) (/ hi-lock-highlight-range 2)))
 584                (search-start
 585                 (max (point-min)
 586                      (- range-min (max 0 (- range-max (point-max))))))
 587                (search-end
 588                 (min (point-max)
 589                      (+ range-max (max 0 (- (point-min) range-min))))))
 590           (save-excursion
 591             (goto-char search-start)
 592             (while (re-search-forward regexp search-end t)
 593               (let ((overlay (make-overlay (match-beginning 0) (match-end 0))))
 594                 (overlay-put overlay 'hi-lock-overlay t)
 595                 (overlay-put overlay 'hi-lock-overlay-regexp serial)
 596                 (overlay-put overlay 'face face))
 597               (goto-char (match-end 0)))))))))
 598
 599 (defun hi-lock-set-file-patterns (patterns)
 600   "Replace file patterns list with PATTERNS and refontify."
 601   (when (or hi-lock-file-patterns patterns)
 602     (font-lock-remove-keywords nil hi-lock-file-patterns)
 603     (setq hi-lock-file-patterns patterns)
 604     (font-lock-add-keywords nil hi-lock-file-patterns t)
 605     (font-lock-fontify-buffer)))
 606
 607 (defun hi-lock-find-patterns ()
 608   "Find patterns in current buffer for hi-lock."
 609   (interactive)
 610   (unless (memq major-mode hi-lock-exclude-modes)
 611     (let ((all-patterns nil)
 612           (target-regexp (concat "\\<" hi-lock-file-patterns-prefix ":")))
 613       (save-excursion
 614         (save-restriction
 615           (widen)
 616           (goto-char (point-min))
 617           (re-search-forward target-regexp
 618                              (+ (point) hi-lock-file-patterns-range) t)
 619           (beginning-of-line)
 620           (while (and (re-search-forward target-regexp (+ (point) 100) t)
 621                       (not (looking-at "\\s-*end")))
 622             (condition-case nil
 623                 (setq all-patterns (append (read (current-buffer)) all-patterns))
 624               (error (message "Invalid pattern list expression at %d"
 625                               (line-number-at-pos)))))))
 626       (when (and all-patterns
 627                  hi-lock-mode
 628                  (cond
 629                   ((eq this-command 'hi-lock-find-patterns) t)
 630                   ((functionp hi-lock-file-patterns-policy)
 631                    (funcall hi-lock-file-patterns-policy all-patterns))
 632                   ((eq hi-lock-file-patterns-policy 'ask)
 633                    (y-or-n-p "Add patterns from this buffer to hi-lock? "))
 634                   (t nil)))
 635         (hi-lock-set-file-patterns all-patterns)
 636         (if (called-interactively-p 'interactive)
 637             (message "Hi-lock added %d patterns." (length all-patterns)))))))
 638
 639 (defun hi-lock-font-lock-hook ()
 640   "Add hi-lock patterns to font-lock's."
 641   (when font-lock-fontified
 642     (font-lock-add-keywords nil hi-lock-file-patterns t)
 643     (font-lock-add-keywords nil hi-lock-interactive-patterns t)))
 644
 645 (defvar hi-lock-string-serialize-hash
 646   (make-hash-table :test 'equal)
 647   "Hash table used to assign unique numbers to strings.")
 648
 649 (defvar hi-lock-string-serialize-serial 1
 650   "Number assigned to last new string in call to `hi-lock-string-serialize'.
 651 A string is considered new if it had not previously been used in a call to
 652 `hi-lock-string-serialize'.")
 653
 654 (defun hi-lock-string-serialize (string)
 655   "Return unique serial number for STRING."
 656   (interactive)
 657   (let ((val (gethash string hi-lock-string-serialize-hash)))
 658     (if val val
 659       (puthash string
 660                (setq hi-lock-string-serialize-serial
 661                      (1+ hi-lock-string-serialize-serial))
 662                hi-lock-string-serialize-hash)
 663       hi-lock-string-serialize-serial)))
 664
 665 (defun hi-lock-unload-function ()
 666   "Unload the Hi-Lock library."
 667   (global-hi-lock-mode -1)
 668   ;; continue standard unloading
 669   nil)
 670
 671 (provide 'hi-lock)
 672
 673 ;;; hi-lock.el ends here