lisp/hi-lock.el

   1 ;;; hi-lock.el --- minor mode for interactive automatic highlighting
   2
   3 ;; Copyright (C) 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   5
   6 ;; Author: David M. Koppelman, koppel@ece.lsu.edu
   7 ;; Keywords: faces, minor-mode, matching, display
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 3, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24 ;; Boston, MA 02110-1301, USA.
  25
  26 ;;; Commentary:
  27 ;;
  28 ;;  With the hi-lock commands text matching interactively entered
  29 ;;  regexp's can be highlighted.  For example, `M-x highlight-regexp
  30 ;;  RET clearly RET RET' will highlight all occurrences of `clearly'
  31 ;;  using a yellow background face.  New occurrences of `clearly' will
  32 ;;  be highlighted as they are typed.  `M-x unhighlight-regexp RET'
  33 ;;  will remove the highlighting.  Any existing face can be used for
  34 ;;  highlighting and a set of appropriate faces is provided.  The
  35 ;;  regexps can be written into the current buffer in a form that will
  36 ;;  be recognized the next time the corresponding file is read (when
  37 ;;  file patterns is turned on).
  38 ;;
  39 ;;  Applications:
  40 ;;
  41 ;;    In program source code highlight a variable to quickly see all
  42 ;;    places it is modified or referenced:
  43 ;;    M-x highlight-regexp ground_contact_switches_closed RET RET
  44 ;;
  45 ;;    In a shell or other buffer that is showing lots of program
  46 ;;    output, highlight the parts of the output you're interested in:
  47 ;;    M-x highlight-regexp Total execution time [0-9]+ RET hi-blue-b RET
  48 ;;
  49 ;;    In buffers displaying tables, highlight the lines you're interested in:
  50 ;;    M-x highlight-lines-matching-regexp January 2000 RET hi-black-b RET
  51 ;;
  52 ;;    When writing text, highlight personal cliches.  This can be
  53 ;;    amusing.
  54 ;;    M-x highlight-phrase as can be seen RET RET
  55 ;;
  56 ;;  Setup:
  57 ;;
  58 ;;    Put the following code in your .emacs file.  This turns on
  59 ;;    hi-lock mode and adds a "Regexp Highlighting" entry
  60 ;;    to the edit menu.
  61 ;;
  62 ;;    (global-hi-lock-mode 1)
  63 ;;
  64 ;;    To enable the use of patterns found in files (presumably placed
  65 ;;    there by hi-lock) include the following in your .emacs file:
  66 ;;
  67 ;;    (setq hi-lock-file-patterns-policy 'ask)
  68 ;;
  69 ;;    If you get tired of being asked each time a file is loaded replace
  70 ;;    `ask' with a function that returns t if patterns should be read.
  71 ;;
  72 ;;    You might also want to bind the hi-lock commands to more
  73 ;;    finger-friendly sequences:
  74
  75 ;;    (define-key hi-lock-map "\C-z\C-h" 'highlight-lines-matching-regexp)
  76 ;;    (define-key hi-lock-map "\C-zi" 'hi-lock-find-patterns)
  77 ;;    (define-key hi-lock-map "\C-zh" 'highlight-regexp)
  78 ;;    (define-key hi-lock-map "\C-zp" 'highlight-phrase)
  79 ;;    (define-key hi-lock-map "\C-zr" 'unhighlight-regexp)
  80 ;;    (define-key hi-lock-map "\C-zb" 'hi-lock-write-interactive-patterns))
  81
  82 ;;    See the documentation for hi-lock-mode `C-h f hi-lock-mode' for
  83 ;;    additional instructions.
  84
  85 ;; Sample file patterns:
  86
  87 ; Hi-lock: (("^;;; .*" (0 (quote hi-black-hb) t)))
  88 ; Hi-lock: ( ("make-variable-buffer-\\(local\\)" (0 font-lock-keyword-face)(1 'italic append)))))
  89 ; Hi-lock: end
  90
  91 ;;; Code:
  92
  93 (eval-and-compile
  94   (require 'font-lock))
  95
  96 (defgroup hi-lock nil
  97   "Interactively add and remove font-lock patterns for highlighting text."
  98   :link '(custom-manual "(emacs)Highlight Interactively")
  99   :group 'font-lock)
 100
 101 (defcustom hi-lock-file-patterns-range 10000
 102   "Limit of search in a buffer for hi-lock patterns.
 103 When a file is visited and hi-lock mode is on, patterns starting
 104 up to this limit are added to font-lock's patterns.  See documentation
 105 of functions `hi-lock-mode' and `hi-lock-find-patterns'."
 106   :type 'integer
 107   :group 'hi-lock)
 108
 109 (defcustom hi-lock-highlight-range 200000
 110   "Size of area highlighted by hi-lock when font-lock not active.
 111 Font-lock is not active in buffers that do their own highlighting,
 112 such as the buffer created by `list-colors-display'.  In those buffers
 113 hi-lock patterns will only be applied over a range of
 114 `hi-lock-highlight-range' characters.  If font-lock is active then
 115 highlighting will be applied throughout the buffer."
 116   :type 'integer
 117   :group 'hi-lock)
 118
 119 (defcustom hi-lock-exclude-modes
 120   '(rmail-mode mime/viewer-mode gnus-article-mode)
 121   "List of major modes in which hi-lock will not run.
 122 For security reasons since font lock patterns can specify function
 123 calls."
 124   :type '(repeat symbol)
 125   :group 'hi-lock)
 126
 127 (defcustom hi-lock-file-patterns-policy 'ask
 128   "Specify when hi-lock should use patterns found in file.
 129 If `ask', prompt when patterns found in buffer; if bound to a function,
 130 use patterns when function returns t (function is called with patterns
 131 as first argument); if nil or `never' or anything else, don't use file
 132 patterns."
 133   :type '(choice (const :tag "Do not use file patterns" never)
 134                  (const :tag "Ask about file patterns" ask)
 135                  (function :tag "Function to check file patterns"))
 136   :group 'hi-lock
 137   :version "22.1")
 138
 139 ;; It can have a function value.
 140 (put 'hi-lock-file-patterns-policy 'risky-local-variable t)
 141
 142 (defgroup hi-lock-faces nil
 143   "Faces for hi-lock."
 144   :group 'hi-lock
 145   :group 'faces)
 146
 147 (defface hi-yellow
 148   '((((min-colors 88) (background dark))
 149      (:background "yellow1" :foreground "black"))
 150     (((background dark)) (:background "yellow" :foreground "black"))
 151     (((min-colors 88)) (:background "yellow1"))
 152     (t (:background "yellow")))
 153   "Default face for hi-lock mode."
 154   :group 'hi-lock-faces)
 155
 156 (defface hi-pink
 157   '((((background dark)) (:background "pink" :foreground "black"))
 158     (t (:background "pink")))
 159   "Face for hi-lock mode."
 160   :group 'hi-lock-faces)
 161
 162 (defface hi-green
 163   '((((min-colors 88) (background dark))
 164      (:background "green1" :foreground "black"))
 165     (((background dark)) (:background "green" :foreground "black"))
 166     (((min-colors 88)) (:background "green1"))
 167     (t (:background "green")))
 168   "Face for hi-lock mode."
 169   :group 'hi-lock-faces)
 170
 171 (defface hi-blue
 172   '((((background dark)) (:background "light blue" :foreground "black"))
 173     (t (:background "light blue")))
 174   "Face for hi-lock mode."
 175   :group 'hi-lock-faces)
 176
 177 (defface hi-black-b
 178   '((t (:weight bold)))
 179   "Face for hi-lock mode."
 180   :group 'hi-lock-faces)
 181
 182 (defface hi-blue-b
 183   '((((min-colors 88)) (:weight bold :foreground "blue1"))
 184     (t (:weight bold :foreground "blue")))
 185   "Face for hi-lock mode."
 186   :group 'hi-lock-faces)
 187
 188 (defface hi-green-b
 189   '((((min-colors 88)) (:weight bold :foreground "green1"))
 190     (t (:weight bold :foreground "green")))
 191   "Face for hi-lock mode."
 192   :group 'hi-lock-faces)
 193
 194 (defface hi-red-b
 195   '((((min-colors 88)) (:weight bold :foreground "red1"))
 196     (t (:weight bold :foreground "red")))
 197   "Face for hi-lock mode."
 198   :group 'hi-lock-faces)
 199
 200 (defface hi-black-hb
 201   '((t (:weight bold :height 1.67 :inherit variable-pitch)))
 202   "Face for hi-lock mode."
 203   :group 'hi-lock-faces)
 204
 205 (defvar hi-lock-file-patterns nil
 206   "Patterns found in file for hi-lock.  Should not be changed.")
 207
 208 (defvar hi-lock-interactive-patterns nil
 209   "Patterns provided to hi-lock by user.  Should not be changed.")
 210
 211 (defvar hi-lock-face-history
 212   (list "hi-yellow" "hi-pink" "hi-green" "hi-blue" "hi-black-b"
 213         "hi-blue-b" "hi-red-b" "hi-green-b" "hi-black-hb")
 214       "History list of faces for hi-lock interactive functions.")
 215
 216 ;(dolist (f hi-lock-face-history) (unless (facep f) (error "%s not a face" f)))
 217
 218 (defvar hi-lock-regexp-history nil
 219   "History of regexps used for interactive fontification.")
 220
 221 (defvar hi-lock-file-patterns-prefix "Hi-lock"
 222   "Search target for finding hi-lock patterns at top of file.")
 223
 224 (defvar hi-lock-archaic-interface-message-used nil
 225   "True if user alerted that `global-hi-lock-mode' is now the global switch.
 226 Earlier versions of hi-lock used `hi-lock-mode' as the global switch;
 227 the message is issued if it appears that `hi-lock-mode' is used assuming
 228 that older functionality.  This variable avoids multiple reminders.")
 229
 230 (defvar hi-lock-archaic-interface-deduce nil
 231   "If non-nil, sometimes assume that `hi-lock-mode' means `global-hi-lock-mode'.
 232 Assumption is made if `hi-lock-mode' used in the *scratch* buffer while
 233 a library is being loaded.")
 234
 235 (make-variable-buffer-local 'hi-lock-interactive-patterns)
 236 (put 'hi-lock-interactive-patterns 'permanent-local t)
 237 (make-variable-buffer-local 'hi-lock-regexp-history)
 238 (put 'hi-lock-regexp-history 'permanent-local t)
 239 (make-variable-buffer-local 'hi-lock-file-patterns)
 240 (put 'hi-lock-file-patterns 'permanent-local t)
 241
 242 (defvar hi-lock-menu (make-sparse-keymap "Hi Lock")
 243   "Menu for hi-lock mode.")
 244
 245 (define-key-after hi-lock-menu [highlight-regexp]
 246   '(menu-item "Highlight Regexp..." highlight-regexp
 247               :help "Highlight text matching PATTERN (a regexp)."))
 248
 249 (define-key-after hi-lock-menu [highlight-phrase]
 250   '(menu-item "Highlight Phrase..." highlight-phrase
 251               :help "Highlight text matching PATTERN (a regexp processed to match phrases)."))
 252
 253 (define-key-after hi-lock-menu [highlight-lines-matching-regexp]
 254   '(menu-item "Highlight Lines..." highlight-lines-matching-regexp
 255               :help "Highlight lines containing match of PATTERN (a regexp).."))
 256
 257 (define-key-after hi-lock-menu [unhighlight-regexp]
 258   '(menu-item "Remove Highlighting..." unhighlight-regexp
 259               :help "Remove previously entered highlighting pattern."
 260               :enable hi-lock-interactive-patterns))
 261
 262 (define-key-after hi-lock-menu [hi-lock-write-interactive-patterns]
 263   '(menu-item "Patterns to Buffer" hi-lock-write-interactive-patterns
 264               :help "Insert interactively added REGEXPs into buffer at point."
 265               :enable hi-lock-interactive-patterns))
 266
 267 (define-key-after hi-lock-menu [hi-lock-find-patterns]
 268   '(menu-item "Patterns from Buffer" hi-lock-find-patterns
 269               :help "Use patterns (if any) near top of buffer."))
 270
 271 (defvar hi-lock-map (make-sparse-keymap "Hi Lock")
 272   "Key map for hi-lock.")
 273
 274 (define-key hi-lock-map "\C-xwi" 'hi-lock-find-patterns)
 275 (define-key hi-lock-map "\C-xwl" 'highlight-lines-matching-regexp)
 276 (define-key hi-lock-map "\C-xwp" 'highlight-phrase)
 277 (define-key hi-lock-map "\C-xwh" 'highlight-regexp)
 278 (define-key hi-lock-map "\C-xwr" 'unhighlight-regexp)
 279 (define-key hi-lock-map "\C-xwb" 'hi-lock-write-interactive-patterns)
 280
 281 ;; Visible Functions
 282
 283 ;;;###autoload
 284 (define-minor-mode hi-lock-mode
 285   "Toggle minor mode for interactively adding font-lock highlighting patterns.
 286
 287 If ARG positive, turn hi-lock on.  Issuing a hi-lock command will also
 288 turn hi-lock on.  To turn hi-lock on in all buffers use
 289 `global-hi-lock-mode' or in your .emacs file (global-hi-lock-mode 1).
 290 When hi-lock is turned on, a \"Regexp Highlighting\" submenu is added
 291 to the \"Edit\" menu.  The commands in the submenu, which can be
 292 called interactively, are:
 293
 294 \\[highlight-regexp] REGEXP FACE
 295   Highlight matches of pattern REGEXP in current buffer with FACE.
 296
 297 \\[highlight-phrase] PHRASE FACE
 298   Highlight matches of phrase PHRASE in current buffer with FACE.
 299   (PHRASE can be any REGEXP, but spaces will be replaced by matches
 300   to whitespace and initial lower-case letters will become case insensitive.)
 301
 302 \\[highlight-lines-matching-regexp] REGEXP FACE
 303   Highlight lines containing matches of REGEXP in current buffer with FACE.
 304
 305 \\[unhighlight-regexp] REGEXP
 306   Remove highlighting on matches of REGEXP in current buffer.
 307
 308 \\[hi-lock-write-interactive-patterns]
 309   Write active REGEXPs into buffer as comments (if possible).  They may
 310   be read the next time file is loaded or when the \\[hi-lock-find-patterns] command
 311   is issued.  The inserted regexps are in the form of font lock keywords.
 312   (See `font-lock-keywords'.)  They may be edited and re-loaded with \\[hi-lock-find-patterns],
 313   any valid `font-lock-keywords' form is acceptable. When a file is
 314   loaded the patterns are read if `hi-lock-file-patterns-policy is
 315   'ask and the user responds y to the prompt, or if
 316   `hi-lock-file-patterns-policy' is bound to a function and that
 317   function returns t.
 318
 319 \\[hi-lock-find-patterns]
 320   Re-read patterns stored in buffer (in the format produced by \\[hi-lock-write-interactive-patterns]).
 321
 322 When hi-lock is started and if the mode is not excluded or patterns
 323 rejected, the beginning of the buffer is searched for lines of the
 324 form:
 325   Hi-lock: FOO
 326 where FOO is a list of patterns.  These are added to the font lock
 327 keywords already present.  The patterns must start before position
 328 \(number of characters into buffer) `hi-lock-file-patterns-range'.
 329 Patterns will be read until
 330  Hi-lock: end
 331 is found.  A mode is excluded if it's in the list `hi-lock-exclude-modes'."
 332   :group 'hi-lock
 333   :lighter (:eval (if (or hi-lock-interactive-patterns
 334                           hi-lock-file-patterns)
 335                       " Hi" ""))
 336   :global nil
 337   :keymap hi-lock-map
 338   (when (and (equal (buffer-name) "*scratch*")
 339              load-in-progress
 340              (not (interactive-p))
 341              (not hi-lock-archaic-interface-message-used))
 342     (setq hi-lock-archaic-interface-message-used t)
 343     (if hi-lock-archaic-interface-deduce
 344         (global-hi-lock-mode hi-lock-mode)
 345       (warn
 346        "Possible archaic use of (hi-lock-mode).
 347 Use (global-hi-lock-mode 1) in .emacs to enable hi-lock for all buffers,
 348 use (hi-lock-mode 1) for individual buffers.  For compatibility with Emacs
 349 versions before 22 use the following in your .emacs file:
 350
 351         (if (functionp 'global-hi-lock-mode)
 352             (global-hi-lock-mode 1)
 353           (hi-lock-mode 1))
 354 ")))
 355   (if hi-lock-mode
 356       ;; Turned on.
 357       (progn
 358         (unless font-lock-mode (font-lock-mode 1))
 359         (define-key-after menu-bar-edit-menu [hi-lock]
 360           (cons "Regexp Highlighting" hi-lock-menu))
 361         (hi-lock-find-patterns)
 362         (add-hook 'font-lock-mode-hook 'hi-lock-font-lock-hook nil t))
 363     ;; Turned off.
 364     (when (or hi-lock-interactive-patterns
 365               hi-lock-file-patterns)
 366       (when hi-lock-interactive-patterns
 367         (font-lock-remove-keywords nil hi-lock-interactive-patterns)
 368         (setq hi-lock-interactive-patterns nil))
 369       (when hi-lock-file-patterns
 370         (font-lock-remove-keywords nil hi-lock-file-patterns)
 371         (setq hi-lock-file-patterns nil))
 372       (remove-overlays nil nil 'hi-lock-overlay t)
 373       (when font-lock-fontified (font-lock-fontify-buffer)))
 374     (define-key-after menu-bar-edit-menu [hi-lock] nil)
 375     (remove-hook 'font-lock-mode-hook 'hi-lock-font-lock-hook t)))
 376
 377 ;;;###autoload
 378 (define-globalized-minor-mode global-hi-lock-mode
 379   hi-lock-mode turn-on-hi-lock-if-enabled
 380   :group 'hi-lock)
 381
 382 (defun turn-on-hi-lock-if-enabled ()
 383   (setq hi-lock-archaic-interface-message-used t)
 384   (unless (memq major-mode hi-lock-exclude-modes)
 385     (hi-lock-mode 1)))
 386
 387 ;;;###autoload
 388 (defalias 'highlight-lines-matching-regexp 'hi-lock-line-face-buffer)
 389 ;;;###autoload
 390 (defun hi-lock-line-face-buffer (regexp &optional face)
 391   "Set face of all lines containing a match of REGEXP to FACE.
 392
 393 Interactively, prompt for REGEXP then FACE.  Buffer-local history
 394 list maintained for regexps, global history maintained for faces.
 395 \\<minibuffer-local-map>Use \\[next-history-element] and \\[previous-history-element] to retrieve next or previous history item.
 396 \(See info node `Minibuffer History'.)"
 397   (interactive
 398    (list
 399     (hi-lock-regexp-okay
 400      (read-from-minibuffer "Regexp to highlight line: "
 401                            (cons (or (car hi-lock-regexp-history) "") 1 )
 402                            nil nil 'hi-lock-regexp-history))
 403     (hi-lock-read-face-name)))
 404   (or (facep face) (setq face 'hi-yellow))
 405   (unless hi-lock-mode (hi-lock-mode 1))
 406   (hi-lock-set-pattern
 407    ;; The \\(?:...\\) grouping construct ensures that a leading ^, +, * or ?
 408    ;; or a trailing $ in REGEXP will be interpreted correctly.
 409    (concat "^.*\\(?:" regexp "\\).*$") face))
 410
 411
 412 ;;;###autoload
 413 (defalias 'highlight-regexp 'hi-lock-face-buffer)
 414 ;;;###autoload
 415 (defun hi-lock-face-buffer (regexp &optional face)
 416   "Set face of each match of REGEXP to FACE.
 417
 418 Interactively, prompt for REGEXP then FACE.  Buffer-local history
 419 list maintained for regexps, global history maintained for faces.
 420 \\<minibuffer-local-map>Use \\[next-history-element] and \\[previous-history-element] to retrieve next or previous history item.
 421 \(See info node `Minibuffer History'.)"
 422   (interactive
 423    (list
 424     (hi-lock-regexp-okay
 425      (read-from-minibuffer "Regexp to highlight: "
 426                            (cons (or (car hi-lock-regexp-history) "") 1 )
 427                            nil nil 'hi-lock-regexp-history))
 428     (hi-lock-read-face-name)))
 429   (or (facep face) (setq face 'hi-yellow))
 430   (unless hi-lock-mode (hi-lock-mode 1))
 431   (hi-lock-set-pattern regexp face))
 432
 433 ;;;###autoload
 434 (defalias 'highlight-phrase 'hi-lock-face-phrase-buffer)
 435 ;;;###autoload
 436 (defun hi-lock-face-phrase-buffer (regexp &optional face)
 437   "Set face of each match of phrase REGEXP to FACE.
 438
 439 Whitespace in REGEXP converted to arbitrary whitespace and initial
 440 lower-case letters made case insensitive."
 441   (interactive
 442    (list
 443     (hi-lock-regexp-okay
 444      (hi-lock-process-phrase
 445       (read-from-minibuffer "Phrase to highlight: "
 446                             (cons (or (car hi-lock-regexp-history) "") 1 )
 447                             nil nil 'hi-lock-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 ;;;###autoload
 454 (defalias 'unhighlight-regexp 'hi-lock-unface-buffer)
 455 ;;;###autoload
 456 (defun hi-lock-unface-buffer (regexp)
 457   "Remove highlighting of each match to REGEXP set by hi-lock.
 458
 459 Interactively, prompt for REGEXP.  Buffer-local history of inserted
 460 regexp's maintained.  Will accept only regexps inserted by hi-lock
 461 interactive functions.  \(See `hi-lock-interactive-patterns'.\)
 462 \\<minibuffer-local-must-match-map>Use \\[minibuffer-complete] to complete a partially typed regexp.
 463 \(See info node `Minibuffer History'.\)"
 464   (interactive
 465    (if (and (display-popup-menus-p) (vectorp (this-command-keys)))
 466        (catch 'snafu
 467          (or
 468           (x-popup-menu
 469            t
 470            (cons
 471             `keymap
 472             (cons "Select Pattern to Unhighlight"
 473                   (mapcar (lambda (pattern)
 474                             (list (car pattern)
 475                                   (format
 476                                    "%s (%s)" (car pattern)
 477                                    (symbol-name
 478                                     (car
 479                                      (cdr (car (cdr (car (cdr pattern))))))))
 480                                   (cons nil nil)
 481                                   (car pattern)))
 482                           hi-lock-interactive-patterns))))
 483           ;; If the user clicks outside the menu, meaning that they
 484           ;; change their mind, x-popup-menu returns nil, and
 485           ;; interactive signals a wrong number of arguments error.
 486           ;; To prevent that, we return an empty string, which will
 487           ;; effectively disable the rest of the function.
 488           (throw 'snafu '(""))))
 489      (let ((history-list (mapcar (lambda (p) (car p))
 490                                  hi-lock-interactive-patterns)))
 491        (unless hi-lock-interactive-patterns
 492          (error "No highlighting to remove"))
 493        (list
 494         (completing-read "Regexp to unhighlight: "
 495                          hi-lock-interactive-patterns nil t
 496                          (car (car hi-lock-interactive-patterns))
 497                          (cons 'history-list 1))))))
 498   (let ((keyword (assoc regexp hi-lock-interactive-patterns)))
 499     (when keyword
 500       (font-lock-remove-keywords nil (list keyword))
 501       (setq hi-lock-interactive-patterns
 502             (delq keyword hi-lock-interactive-patterns))
 503       (remove-overlays
 504        nil nil 'hi-lock-overlay-regexp (hi-lock-string-serialize regexp))
 505       (when font-lock-fontified (font-lock-fontify-buffer)))))
 506
 507 ;;;###autoload
 508 (defun hi-lock-write-interactive-patterns ()
 509   "Write interactively added patterns, if any, into buffer at point.
 510
 511 Interactively added patterns are those normally specified using
 512 `highlight-regexp' and `highlight-lines-matching-regexp'; they can
 513 be found in variable `hi-lock-interactive-patterns'."
 514   (interactive)
 515   (if (null hi-lock-interactive-patterns)
 516       (error "There are no interactive patterns"))
 517   (let ((beg (point)))
 518     (mapcar
 519      (lambda (pattern)
 520        (insert (format "%s: (%s)\n"
 521                        hi-lock-file-patterns-prefix
 522                        (prin1-to-string pattern))))
 523      hi-lock-interactive-patterns)
 524     (comment-region beg (point)))
 525   (when (> (point) hi-lock-file-patterns-range)
 526     (warn "Inserted keywords not close enough to top of file")))
 527
 528 ;; Implementation Functions
 529
 530 (defun hi-lock-process-phrase (phrase)
 531   "Convert regexp PHRASE to a regexp that matches phrases.
 532
 533 Blanks in PHRASE replaced by regexp that matches arbitrary whitespace
 534 and initial lower-case letters made case insensitive."
 535   (let ((mod-phrase nil))
 536     (setq mod-phrase
 537           (replace-regexp-in-string
 538            "\\<[a-z]" (lambda (m) (format "[%s%s]" (upcase m) m)) phrase))
 539     (setq mod-phrase
 540           (replace-regexp-in-string
 541            "\\s-+" "[ \t\n]+" mod-phrase nil t))))
 542
 543 (defun hi-lock-regexp-okay (regexp)
 544   "Return REGEXP if it appears suitable for a font-lock pattern.
 545
 546 Otherwise signal an error.  A pattern that matches the null string is
 547 not suitable."
 548   (if (string-match regexp "")
 549       (error "Regexp cannot match an empty string")
 550     regexp))
 551
 552 (defun hi-lock-read-face-name ()
 553   "Read face name from minibuffer with completion and history."
 554   (intern (completing-read
 555            "Highlight using face: "
 556            obarray 'facep t
 557            (cons (car hi-lock-face-history)
 558                  (let ((prefix
 559                         (try-completion
 560                          (substring (car hi-lock-face-history) 0 1)
 561                          (mapcar (lambda (f) (cons f f))
 562                                  hi-lock-face-history))))
 563                    (if (and (stringp prefix)
 564                             (not (equal prefix (car hi-lock-face-history))))
 565                        (length prefix) 0)))
 566            '(hi-lock-face-history . 0))))
 567
 568 (defun hi-lock-set-pattern (regexp face)
 569   "Highlight REGEXP with face FACE."
 570   (let ((pattern (list regexp (list 0 (list 'quote face) t))))
 571     (unless (member pattern hi-lock-interactive-patterns)
 572       (font-lock-add-keywords nil (list pattern) t)
 573       (push pattern hi-lock-interactive-patterns)
 574       (if font-lock-fontified
 575           (font-lock-fontify-buffer)
 576         (let* ((serial (hi-lock-string-serialize regexp))
 577                (range-min (- (point) (/ hi-lock-highlight-range 2)))
 578                (range-max (+ (point) (/ hi-lock-highlight-range 2)))
 579                (search-start
 580                 (max (point-min)
 581                      (- range-min (max 0 (- range-max (point-max))))))
 582                (search-end
 583                 (min (point-max)
 584                      (+ range-max (max 0 (- (point-min) range-min))))))
 585           (save-excursion
 586             (goto-char search-start)
 587             (while (re-search-forward regexp search-end t)
 588               (let ((overlay (make-overlay (match-beginning 0) (match-end 0))))
 589                 (overlay-put overlay 'hi-lock-overlay t)
 590                 (overlay-put overlay 'hi-lock-overlay-regexp serial)
 591                 (overlay-put overlay 'face face))
 592               (goto-char (match-end 0)))))))))
 593
 594 (defun hi-lock-set-file-patterns (patterns)
 595   "Replace file patterns list with PATTERNS and refontify."
 596   (when (or hi-lock-file-patterns patterns)
 597     (font-lock-remove-keywords nil hi-lock-file-patterns)
 598     (setq hi-lock-file-patterns patterns)
 599     (font-lock-add-keywords nil hi-lock-file-patterns t)
 600     (font-lock-fontify-buffer)))
 601
 602 (defun hi-lock-find-patterns ()
 603   "Find patterns in current buffer for hi-lock."
 604   (interactive)
 605   (unless (memq major-mode hi-lock-exclude-modes)
 606     (let ((all-patterns nil)
 607           (target-regexp (concat "\\<" hi-lock-file-patterns-prefix ":")))
 608       (save-excursion
 609         (save-restriction
 610           (widen)
 611           (goto-char (point-min))
 612           (re-search-forward target-regexp
 613                              (+ (point) hi-lock-file-patterns-range) t)
 614           (beginning-of-line)
 615           (while (and (re-search-forward target-regexp (+ (point) 100) t)
 616                       (not (looking-at "\\s-*end")))
 617             (condition-case nil
 618                 (setq all-patterns (append (read (current-buffer)) all-patterns))
 619               (error (message "Invalid pattern list expression at %d"
 620                               (line-number-at-pos)))))))
 621       (when (and all-patterns
 622                  hi-lock-mode
 623                  (cond
 624                   ((eq this-command 'hi-lock-find-patterns) t)
 625                   ((functionp hi-lock-file-patterns-policy)
 626                    (funcall hi-lock-file-patterns-policy all-patterns))
 627                   ((eq hi-lock-file-patterns-policy 'ask)
 628                    (y-or-n-p "Add patterns from this buffer to hi-lock? "))
 629                   (t nil)))
 630         (hi-lock-set-file-patterns all-patterns)
 631         (if (interactive-p)
 632             (message "Hi-lock added %d patterns." (length all-patterns)))))))
 633
 634 (defun hi-lock-font-lock-hook ()
 635   "Add hi-lock patterns to font-lock's."
 636   (if font-lock-mode
 637       (progn
 638         (font-lock-add-keywords nil hi-lock-file-patterns t)
 639         (font-lock-add-keywords nil hi-lock-interactive-patterns t))
 640     (hi-lock-mode -1)))
 641
 642 (defvar hi-lock-string-serialize-hash
 643   (make-hash-table :test 'equal)
 644   "Hash table used to assign unique numbers to strings.")
 645
 646 (defvar hi-lock-string-serialize-serial 1
 647   "Number assigned to last new string in call to `hi-lock-string-serialize'.
 648 A string is considered new if it had not previously been used in a call to
 649 `hi-lock-string-serialize'.")
 650
 651 (defun hi-lock-string-serialize (string)
 652   "Return unique serial number for STRING."
 653   (interactive)
 654   (let ((val (gethash string hi-lock-string-serialize-hash)))
 655     (if val val
 656       (puthash string
 657                (setq hi-lock-string-serialize-serial
 658                      (1+ hi-lock-string-serialize-serial))
 659                hi-lock-string-serialize-hash)
 660       hi-lock-string-serialize-serial)))
 661
 662 (provide 'hi-lock)
 663
 664 ;; arch-tag: d2e8fd07-4cc9-4c6f-a200-1e729bc54066
 665 ;;; hi-lock.el ends here