lisp/abbrev.el

   1 ;;; abbrev.el --- abbrev mode commands for Emacs
   2
   3 ;; Copyright (C) 1985, 1986, 1987, 1992, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   5
   6 ;; Maintainer: FSF
   7 ;; Keywords: abbrev convenience
   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 ;; This facility is documented in the Emacs Manual.
  29
  30 ;; Todo:
  31
  32 ;; - Make abbrev-file-name obey user-emacs-directory.
  33 ;; - Cleanup name space.
  34
  35 ;;; Code:
  36
  37 (eval-when-compile (require 'cl))
  38
  39 (defgroup abbrev-mode nil
  40   "Word abbreviations mode."
  41   :link '(custom-manual "(emacs)Abbrevs")
  42   :group 'abbrev)
  43
  44 (defcustom only-global-abbrevs nil
  45   "Non-nil means user plans to use global abbrevs only.
  46 This makes the commands that normally define mode-specific abbrevs
  47 define global abbrevs instead."
  48   :type 'boolean
  49   :group 'abbrev-mode
  50   :group 'convenience)
  51
  52 (define-minor-mode abbrev-mode
  53   "Toggle Abbrev mode in the current buffer.
  54 With optional argument ARG, turn abbrev mode on if ARG is
  55 positive, otherwise turn it off.  In Abbrev mode, inserting an
  56 abbreviation causes it to expand and be replaced by its expansion.")
  57
  58 (defcustom abbrev-mode nil
  59   "Enable or disable Abbrev mode.
  60 Non-nil means automatically expand abbrevs as they are inserted.
  61
  62 Setting this variable with `setq' changes it for the current buffer.
  63 Changing it with \\[customize] sets the default value.
  64 Interactively, use the command `abbrev-mode'
  65 to enable or disable Abbrev mode in the current buffer."
  66   :type 'boolean
  67   :group 'abbrev-mode)
  68 (put 'abbrev-mode 'safe-local-variable 'booleanp)
  69
  70 \f
  71 (defvar edit-abbrevs-map
  72   (let ((map (make-sparse-keymap)))
  73     (define-key map "\C-x\C-s" 'edit-abbrevs-redefine)
  74     (define-key map "\C-c\C-c" 'edit-abbrevs-redefine)
  75     map)
  76   "Keymap used in `edit-abbrevs'.")
  77
  78 (defun kill-all-abbrevs ()
  79   "Undefine all defined abbrevs."
  80   (interactive)
  81   (dolist (tablesym abbrev-table-name-list)
  82     (clear-abbrev-table (symbol-value tablesym))))
  83
  84 (defun copy-abbrev-table (table)
  85   "Make a new abbrev-table with the same abbrevs as TABLE."
  86   (let ((new-table (make-abbrev-table)))
  87     (mapatoms
  88      (lambda (symbol)
  89        (define-abbrev new-table
  90          (symbol-name symbol)
  91          (symbol-value symbol)
  92          (symbol-function symbol)))
  93      table)
  94     new-table))
  95
  96 (defun insert-abbrevs ()
  97   "Insert after point a description of all defined abbrevs.
  98 Mark is set after the inserted text."
  99   (interactive)
 100   (push-mark
 101    (save-excursion
 102      (dolist (tablesym abbrev-table-name-list)
 103        (insert-abbrev-table-description tablesym t))
 104      (point))))
 105
 106 (defun list-abbrevs (&optional local)
 107   "Display a list of defined abbrevs.
 108 If LOCAL is non-nil, interactively when invoked with a
 109 prefix arg, display only local, i.e. mode-specific, abbrevs.
 110 Otherwise display all abbrevs."
 111   (interactive "P")
 112   (display-buffer (prepare-abbrev-list-buffer local)))
 113
 114 (defun abbrev-table-name (table)
 115   "Value is the name of abbrev table TABLE."
 116   (let ((tables abbrev-table-name-list)
 117         found)
 118     (while (and (not found) tables)
 119       (when (eq (symbol-value (car tables)) table)
 120         (setq found (car tables)))
 121       (setq tables (cdr tables)))
 122     found))
 123
 124 (defun prepare-abbrev-list-buffer (&optional local)
 125   (with-current-buffer (get-buffer-create "*Abbrevs*")
 126     (erase-buffer)
 127     (if local
 128         (insert-abbrev-table-description
 129          (abbrev-table-name local-abbrev-table) t)
 130       (dolist (table abbrev-table-name-list)
 131         (insert-abbrev-table-description table t)))
 132     (goto-char (point-min))
 133     (set-buffer-modified-p nil)
 134     (edit-abbrevs-mode)
 135     (current-buffer)))
 136
 137 (defun edit-abbrevs-mode ()
 138   "Major mode for editing the list of abbrev definitions.
 139 \\{edit-abbrevs-map}"
 140   (interactive)
 141   (kill-all-local-variables)
 142   (setq major-mode 'edit-abbrevs-mode)
 143   (setq mode-name "Edit-Abbrevs")
 144   (use-local-map edit-abbrevs-map)
 145   (run-mode-hooks 'edit-abbrevs-mode-hook))
 146
 147 (defun edit-abbrevs ()
 148   "Alter abbrev definitions by editing a list of them.
 149 Selects a buffer containing a list of abbrev definitions.
 150 You can edit them and type \\<edit-abbrevs-map>\\[edit-abbrevs-redefine] to redefine abbrevs
 151 according to your editing.
 152 Buffer contains a header line for each abbrev table,
 153  which is the abbrev table name in parentheses.
 154 This is followed by one line per abbrev in that table:
 155 NAME   USECOUNT   EXPANSION   HOOK
 156 where NAME and EXPANSION are strings with quotes,
 157 USECOUNT is an integer, and HOOK is any valid function
 158 or may be omitted (it is usually omitted)."
 159   (interactive)
 160   (switch-to-buffer (prepare-abbrev-list-buffer)))
 161
 162 (defun edit-abbrevs-redefine ()
 163   "Redefine abbrevs according to current buffer contents."
 164   (interactive)
 165   (save-restriction
 166     (widen)
 167     (define-abbrevs t)
 168     (set-buffer-modified-p nil)))
 169
 170 (defun define-abbrevs (&optional arg)
 171   "Define abbrevs according to current visible buffer contents.
 172 See documentation of `edit-abbrevs' for info on the format of the
 173 text you must have in the buffer.
 174 With argument, eliminate all abbrev definitions except
 175 the ones defined from the buffer now."
 176   (interactive "P")
 177   (if arg (kill-all-abbrevs))
 178   (save-excursion
 179     (goto-char (point-min))
 180     (while (and (not (eobp)) (re-search-forward "^(" nil t))
 181       (let* ((buf (current-buffer))
 182              (table (read buf))
 183              abbrevs name hook exp count sys)
 184         (forward-line 1)
 185         (while (progn (forward-line 1)
 186                       (not (eolp)))
 187           (setq name (read buf) count (read buf))
 188           (if (equal count '(sys))
 189               (setq sys t count (read buf)))
 190           (setq exp (read buf))
 191           (skip-chars-backward " \t\n\f")
 192           (setq hook (if (not (eolp)) (read buf)))
 193           (skip-chars-backward " \t\n\f")
 194           (setq abbrevs (cons (list name exp hook count sys) abbrevs)))
 195         (define-abbrev-table table abbrevs)))))
 196
 197 (defun read-abbrev-file (&optional file quietly)
 198   "Read abbrev definitions from file written with `write-abbrev-file'.
 199 Optional argument FILE is the name of the file to read;
 200 it defaults to the value of `abbrev-file-name'.
 201 Optional second argument QUIETLY non-nil means don't display a message."
 202   (interactive
 203    (list
 204     (read-file-name (format "Read abbrev file (default %s): "
 205                             abbrev-file-name)
 206                     nil abbrev-file-name t)))
 207   (load (or file abbrev-file-name) nil quietly)
 208   (setq abbrevs-changed nil))
 209
 210 (defun quietly-read-abbrev-file (&optional file)
 211   "Read abbrev definitions from file written with `write-abbrev-file'.
 212 Optional argument FILE is the name of the file to read;
 213 it defaults to the value of `abbrev-file-name'.
 214 Does not display any message."
 215                                         ;(interactive "fRead abbrev file: ")
 216   (read-abbrev-file file t))
 217
 218 (defun write-abbrev-file (&optional file)
 219   "Write all user-level abbrev definitions to a file of Lisp code.
 220 This does not include system abbrevs; it includes only the abbrev tables
 221 listed in listed in `abbrev-table-name-list'.
 222 The file written can be loaded in another session to define the same abbrevs.
 223 The argument FILE is the file name to write.  If omitted or nil, the file
 224 specified in `abbrev-file-name' is used."
 225   (interactive
 226    (list
 227     (read-file-name "Write abbrev file: "
 228                     (file-name-directory (expand-file-name abbrev-file-name))
 229                     abbrev-file-name)))
 230   (or (and file (> (length file) 0))
 231       (setq file abbrev-file-name))
 232   (let ((coding-system-for-write 'emacs-mule))
 233     (with-temp-file file
 234       (insert ";;-*-coding: emacs-mule;-*-\n")
 235       (dolist (table
 236                ;; We sort the table in order to ease the automatic
 237                ;; merging of different versions of the user's abbrevs
 238                ;; file.  This is useful, for example, for when the
 239                ;; user keeps their home directory in a revision
 240                ;; control system, and is therefore keeping multiple
 241                ;; slightly-differing copies loosely synchronized.
 242                (sort (copy-sequence abbrev-table-name-list)
 243                      (lambda (s1 s2)
 244                        (string< (symbol-name s1)
 245                                 (symbol-name s2)))))
 246         (insert-abbrev-table-description table nil)))))
 247 \f
 248 (defun add-mode-abbrev (arg)
 249   "Define mode-specific abbrev for last word(s) before point.
 250 Argument is how many words before point form the expansion;
 251 or zero means the region is the expansion.
 252 A negative argument means to undefine the specified abbrev.
 253 Reads the abbreviation in the minibuffer.
 254
 255 Don't use this function in a Lisp program; use `define-abbrev' instead."
 256   (interactive "p")
 257   (add-abbrev
 258    (if only-global-abbrevs
 259        global-abbrev-table
 260      (or local-abbrev-table
 261          (error "No per-mode abbrev table")))
 262    "Mode" arg))
 263
 264 (defun add-global-abbrev (arg)
 265   "Define global (all modes) abbrev for last word(s) before point.
 266 The prefix argument specifies the number of words before point that form the
 267 expansion; or zero means the region is the expansion.
 268 A negative argument means to undefine the specified abbrev.
 269 This command uses the minibuffer to read the abbreviation.
 270
 271 Don't use this function in a Lisp program; use `define-abbrev' instead."
 272   (interactive "p")
 273   (add-abbrev global-abbrev-table "Global" arg))
 274
 275 (defun add-abbrev (table type arg)
 276   (let ((exp (and (>= arg 0)
 277                   (buffer-substring-no-properties
 278                    (point)
 279                    (if (= arg 0) (mark)
 280                      (save-excursion (forward-word (- arg)) (point))))))
 281         name)
 282     (setq name
 283           (read-string (format (if exp "%s abbrev for \"%s\": "
 284                                  "Undefine %s abbrev: ")
 285                                type exp)))
 286     (set-text-properties 0 (length name) nil name)
 287     (if (or (null exp)
 288             (not (abbrev-expansion name table))
 289             (y-or-n-p (format "%s expands to \"%s\"; redefine? "
 290                               name (abbrev-expansion name table))))
 291         (define-abbrev table (downcase name) exp))))
 292
 293 (defun inverse-add-mode-abbrev (n)
 294   "Define last word before point as a mode-specific abbrev.
 295 With prefix argument N, defines the Nth word before point.
 296 This command uses the minibuffer to read the expansion.
 297 Expands the abbreviation after defining it."
 298   (interactive "p")
 299   (inverse-add-abbrev
 300    (if only-global-abbrevs
 301        global-abbrev-table
 302      (or local-abbrev-table
 303          (error "No per-mode abbrev table")))
 304    "Mode" n))
 305
 306 (defun inverse-add-global-abbrev (n)
 307   "Define last word before point as a global (mode-independent) abbrev.
 308 With prefix argument N, defines the Nth word before point.
 309 This command uses the minibuffer to read the expansion.
 310 Expands the abbreviation after defining it."
 311   (interactive "p")
 312   (inverse-add-abbrev global-abbrev-table "Global" n))
 313
 314 (defun inverse-add-abbrev (table type arg)
 315   (let (name exp start end)
 316     (save-excursion
 317       (forward-word (1+ (- arg)))
 318       (setq end (point))
 319       (backward-word 1)
 320       (setq start (point)
 321             name (buffer-substring-no-properties start end)))
 322
 323     (setq exp (read-string (format "%s expansion for \"%s\": " type name)
 324                            nil nil nil t))
 325     (when (or (not (abbrev-expansion name table))
 326               (y-or-n-p (format "%s expands to \"%s\"; redefine? "
 327                                 name (abbrev-expansion name table))))
 328       (define-abbrev table (downcase name) exp)
 329       (save-excursion
 330         (goto-char end)
 331         (expand-abbrev)))))
 332
 333 (defun abbrev-prefix-mark (&optional arg)
 334   "Mark current point as the beginning of an abbrev.
 335 Abbrev to be expanded starts here rather than at beginning of word.
 336 This way, you can expand an abbrev with a prefix: insert the prefix,
 337 use this command, then insert the abbrev.  This command inserts a
 338 temporary hyphen after the prefix \(until the intended abbrev
 339 expansion occurs).
 340 If the prefix is itself an abbrev, this command expands it, unless
 341 ARG is non-nil.  Interactively, ARG is the prefix argument."
 342   (interactive "P")
 343   (or arg (expand-abbrev))
 344   (setq abbrev-start-location (point-marker)
 345         abbrev-start-location-buffer (current-buffer))
 346   (insert "-"))
 347
 348 (defun expand-region-abbrevs (start end &optional noquery)
 349   "For abbrev occurrence in the region, offer to expand it.
 350 The user is asked to type `y' or `n' for each occurrence.
 351 A prefix argument means don't query; expand all abbrevs."
 352   (interactive "r\nP")
 353   (save-excursion
 354     (goto-char start)
 355     (let ((lim (- (point-max) end))
 356           pnt string)
 357       (while (and (not (eobp))
 358                   (progn (forward-word 1)
 359                          (<= (setq pnt (point)) (- (point-max) lim))))
 360         (if (abbrev-expansion
 361              (setq string
 362                    (buffer-substring-no-properties
 363                     (save-excursion (forward-word -1) (point))
 364                     pnt)))
 365             (if (or noquery (y-or-n-p (format "Expand `%s'? " string)))
 366                 (expand-abbrev)))))))
 367
 368 ;;; Abbrev properties.
 369
 370 (defun abbrev-table-get (table prop)
 371   "Get the PROP property of abbrev table TABLE."
 372   (let ((sym (intern-soft "" table)))
 373     (if sym (get sym prop))))
 374
 375 (defun abbrev-table-put (table prop val)
 376   "Set the PROP property of abbrev table TABLE to VAL."
 377   (let ((sym (intern "" table)))
 378     (set sym nil)            ; Make sure it won't be confused for an abbrev.
 379     (put sym prop val)))
 380
 381 (defalias 'abbrev-get 'get
 382   "Get the property PROP of abbrev ABBREV
 383
 384 \(fn ABBREV PROP)")
 385
 386 (defalias 'abbrev-put 'put
 387   "Set the property PROP of abbrev ABREV to value VAL.
 388 See `define-abbrev' for the effect of some special properties.
 389
 390 \(fn ABBREV PROP VAL)")
 391
 392 (defmacro abbrev-with-wrapper-hook (var &rest body)
 393   "Run BODY wrapped with the VAR hook.
 394 VAR is a special hook: its functions are called with one argument which
 395 is the \"original\" code (the BODY), so the hook function can wrap the
 396 original function, can call it several times, or even not call it at all.
 397 VAR is normally a symbol (a variable) in which case it is treated like a hook,
 398 with a buffer-local and a global part.  But it can also be an arbitrary expression.
 399 This is similar to an `around' advice."
 400   (declare (indent 1) (debug t))
 401   ;; We need those two gensyms because CL's lexical scoping is not available
 402   ;; for function arguments :-(
 403   (let ((funs (make-symbol "funs"))
 404         (global (make-symbol "global")))
 405     ;; Since the hook is a wrapper, the loop has to be done via
 406     ;; recursion: a given hook function will call its parameter in order to
 407     ;; continue looping.
 408     `(labels ((runrestofhook (,funs ,global)
 409                  ;; `funs' holds the functions left on the hook and `global'
 410                  ;; holds the functions left on the global part of the hook
 411                  ;; (in case the hook is local).
 412                  (lexical-let ((funs ,funs)
 413                                (global ,global))
 414                    (if (consp funs)
 415                        (if (eq t (car funs))
 416                            (runrestofhook (append global (cdr funs)) nil)
 417                          (funcall (car funs)
 418                                   (lambda () (runrestofhook (cdr funs) global))))
 419                      ;; Once there are no more functions on the hook, run
 420                      ;; the original body.
 421                      ,@body))))
 422        (runrestofhook ,var
 423                       ;; The global part of the hook, if any.
 424                       ,(if (symbolp var)
 425                            `(if (local-variable-p ',var)
 426                                 (default-value ',var)))))))
 427
 428
 429 ;;; Code that used to be implemented in src/abbrev.c
 430
 431 (defvar abbrev-table-name-list '(fundamental-mode-abbrev-table
 432                                  global-abbrev-table)
 433   "List of symbols whose values are abbrev tables.")
 434
 435 (defun make-abbrev-table (&optional props)
 436   "Create a new, empty abbrev table object.
 437 PROPS is a "
 438   ;; The value 59 is an arbitrary prime number.
 439   (let ((table (make-vector 59 0)))
 440     ;; Each abbrev-table has a `modiff' counter which can be used to detect
 441     ;; when an abbreviation was added.  An example of use would be to
 442     ;; construct :regexp dynamically as the union of all abbrev names, so
 443     ;; `modiff' can let us detect that an abbrev was added and hence :regexp
 444     ;; needs to be refreshed.
 445     ;; The presence of `modiff' entry is also used as a tag indicating this
 446     ;; vector is really an abbrev-table.
 447     (abbrev-table-put table :abbrev-table-modiff 0)
 448     (while (consp props)
 449       (abbrev-table-put table (pop props) (pop props)))
 450     table))
 451
 452 (defun abbrev-table-p (object)
 453   (and (vectorp object)
 454        (numberp (abbrev-table-get object :abbrev-table-modiff))))
 455
 456 (defvar global-abbrev-table (make-abbrev-table)
 457   "The abbrev table whose abbrevs affect all buffers.
 458 Each buffer may also have a local abbrev table.
 459 If it does, the local table overrides the global one
 460 for any particular abbrev defined in both.")
 461
 462 (defvar abbrev-minor-mode-table-alist nil
 463   "Alist of abbrev tables to use for minor modes.
 464 Each element looks like (VARIABLE . ABBREV-TABLE);
 465 ABBREV-TABLE is active whenever VARIABLE's value is non-nil.")
 466
 467 (defvar fundamental-mode-abbrev-table
 468   (let ((table (make-abbrev-table)))
 469     ;; Set local-abbrev-table's default to be fundamental-mode-abbrev-table.
 470     (setq-default local-abbrev-table table)
 471     table)
 472   "The abbrev table of mode-specific abbrevs for Fundamental Mode.")
 473
 474 (defvar abbrevs-changed nil
 475   "Set non-nil by defining or altering any word abbrevs.
 476 This causes `save-some-buffers' to offer to save the abbrevs.")
 477
 478 (defcustom abbrev-all-caps nil
 479   "Non-nil means expand multi-word abbrevs all caps if abbrev was so."
 480   :type 'boolean
 481   :group 'abbrev-mode)
 482
 483 (defvar abbrev-start-location nil
 484   "Buffer position for `expand-abbrev' to use as the start of the abbrev.
 485 When nil, use the word before point as the abbrev.
 486 Calling `expand-abbrev' sets this to nil.")
 487
 488 (defvar abbrev-start-location-buffer nil
 489   "Buffer that `abbrev-start-location' has been set for.
 490 Trying to expand an abbrev in any other buffer clears `abbrev-start-location'.")
 491
 492 (defvar last-abbrev nil
 493   "The abbrev-symbol of the last abbrev expanded.  See `abbrev-symbol'.")
 494
 495 (defvar last-abbrev-text nil
 496   "The exact text of the last abbrev expanded.
 497 nil if the abbrev has already been unexpanded.")
 498
 499 (defvar last-abbrev-location 0
 500   "The location of the start of the last abbrev expanded.")
 501
 502 ;; (defvar local-abbrev-table fundamental-mode-abbrev-table
 503 ;;   "Local (mode-specific) abbrev table of current buffer.")
 504 ;; (make-variable-buffer-local 'local-abbrev-table)
 505
 506 (defcustom pre-abbrev-expand-hook nil
 507   "Function or functions to be called before abbrev expansion is done.
 508 This is the first thing that `expand-abbrev' does, and so this may change
 509 the current abbrev table before abbrev lookup happens."
 510   :type 'hook
 511   :group 'abbrev-mode)
 512 (make-obsolete-variable 'pre-abbrev-expand-hook 'abbrev-expand-functions "23.1")
 513
 514 (defun clear-abbrev-table (table)
 515   "Undefine all abbrevs in abbrev table TABLE, leaving it empty."
 516   (setq abbrevs-changed t)
 517   (let* ((sym (intern-soft "" table)))
 518     (dotimes (i (length table))
 519       (aset table i 0))
 520     ;; Preserve the table's properties.
 521     (assert sym)
 522     (let ((newsym (intern "" table)))
 523       (set newsym nil)       ; Make sure it won't be confused for an abbrev.
 524       (setplist newsym (symbol-plist sym)))
 525     (abbrev-table-put table :abbrev-table-modiff
 526                       (1+ (abbrev-table-get table :abbrev-table-modiff)))))
 527
 528 (defun define-abbrev (table name expansion &optional hook &rest props)
 529   "Define an abbrev in TABLE named NAME, to expand to EXPANSION and call HOOK.
 530 NAME must be a string, and should be lower-case.
 531 EXPANSION should usually be a string.
 532 To undefine an abbrev, define it with EXPANSION = nil.
 533 If HOOK is non-nil, it should be a function of no arguments;
 534 it is called after EXPANSION is inserted.
 535 If EXPANSION is not a string, the abbrev is a special one,
 536  which does not expand in the usual way but only runs HOOK.
 537
 538 PROPS is a property list.  The following properties are special:
 539 - `:count': the value for the abbrev's usage-count, which is incremented each time
 540   the abbrev is used (the default is zero).
 541 - `:system': if non-nil, says that this is a \"system\" abbreviation
 542   which should not be saved in the user's abbreviation file.
 543   Unless `:system' is `force', a system abbreviation will not
 544   overwrite a non-system abbreviation of the same name.
 545 - `:case-fixed': non-nil means that abbreviations are looked up without
 546   case-folding, and the expansion is not capitalized/upcased.
 547 - `:enable-function': a function of no argument which returns non-nil iff the
 548   abbrev should be used for a particular call of `expand-abbrev'.
 549
 550 An obsolete but still supported calling form is:
 551
 552 \(define-abbrev TABLE NAME EXPANSION &optional HOOK COUNT SYSTEM)."
 553   (when (and (consp props) (or (null (car props)) (numberp (car props))))
 554     ;; Old-style calling convention.
 555     (setq props (list* :count (car props)
 556                        (if (cadr props) (list :system (cadr props))))))
 557   (unless (plist-get props :count)
 558     (setq props (plist-put props :count 0)))
 559   (let ((system-flag (plist-get props :system))
 560         (sym (intern name table)))
 561     ;; Don't override a prior user-defined abbrev with a system abbrev,
 562     ;; unless system-flag is `force'.
 563     (unless (and (not (memq system-flag '(nil force)))
 564                  (boundp sym) (symbol-value sym)
 565                  (not (abbrev-get sym :system)))
 566       (unless (or system-flag
 567                   (and (boundp sym) (fboundp sym)
 568                        ;; load-file-name
 569                        (equal (symbol-value sym) expansion)
 570                        (equal (symbol-function sym) hook)))
 571         (setq abbrevs-changed t))
 572       (set sym expansion)
 573       (fset sym hook)
 574       (setplist sym
 575                 ;; Don't store the `force' value of `system-flag' into
 576                 ;; the :system property.
 577                 (if (eq 'force system-flag) (plist-put props :system t) props))
 578       (abbrev-table-put table :abbrev-table-modiff
 579                         (1+ (abbrev-table-get table :abbrev-table-modiff))))
 580     name))
 581
 582 (defun abbrev--check-chars (abbrev global)
 583   "Check if the characters in ABBREV have word syntax in either the
 584 current (if global is nil) or standard syntax table."
 585   (with-syntax-table
 586       (cond ((null global) (standard-syntax-table))
 587             ;; ((syntax-table-p global) global)
 588             (t (syntax-table)))
 589     (when (string-match "\\W" abbrev)
 590       (let ((badchars ())
 591             (pos 0))
 592         (while (string-match "\\W" abbrev pos)
 593           (pushnew (aref abbrev (match-beginning 0)) badchars)
 594           (setq pos (1+ pos)))
 595         (error "Some abbrev characters (%s) are not word constituents %s"
 596                (apply 'string (nreverse badchars))
 597                (if global "in the standard syntax" "in this mode"))))))
 598
 599 (defun define-global-abbrev (abbrev expansion)
 600   "Define ABBREV as a global abbreviation for EXPANSION.
 601 The characters in ABBREV must all be word constituents in the standard
 602 syntax table."
 603   (interactive "sDefine global abbrev: \nsExpansion for %s: ")
 604   (abbrev--check-chars abbrev 'global)
 605   (define-abbrev global-abbrev-table (downcase abbrev) expansion))
 606
 607 (defun define-mode-abbrev (abbrev expansion)
 608   "Define ABBREV as a mode-specific abbreviation for EXPANSION.
 609 The characters in ABBREV must all be word-constituents in the current mode."
 610   (interactive "sDefine mode abbrev: \nsExpansion for %s: ")
 611   (unless local-abbrev-table
 612     (error "Major mode has no abbrev table"))
 613   (abbrev--check-chars abbrev nil)
 614   (define-abbrev local-abbrev-table (downcase abbrev) expansion))
 615
 616 (defun abbrev--active-tables (&optional tables)
 617   "Return the list of abbrev tables currently active.
 618 TABLES if non-nil overrides the usual rules.  It can hold
 619 either a single abbrev table or a list of abbrev tables."
 620   ;; We could just remove the `tables' arg and let callers use
 621   ;; (or table (abbrev--active-tables)) but then they'd have to be careful
 622   ;; to treat the distinction between a single table and a list of tables.
 623   (cond
 624    ((consp tables) tables)
 625    ((vectorp tables) (list tables))
 626    (t
 627     (let ((tables (if (listp local-abbrev-table)
 628                       (append local-abbrev-table
 629                               (list global-abbrev-table))
 630                     (list local-abbrev-table global-abbrev-table))))
 631       ;; Add the minor-mode abbrev tables.
 632       (dolist (x abbrev-minor-mode-table-alist)
 633         (when (and (symbolp (car x)) (boundp (car x)) (symbol-value (car x)))
 634           (setq tables
 635                 (if (listp (cdr x))
 636                     (append (cdr x) tables) (cons (cdr x) tables)))))
 637       tables))))
 638
 639
 640 (defun abbrev-symbol (abbrev &optional table)
 641   "Return the symbol representing abbrev named ABBREV.
 642 This symbol's name is ABBREV, but it is not the canonical symbol of that name;
 643 it is interned in an abbrev-table rather than the normal obarray.
 644 The value is nil if that abbrev is not defined.
 645 Optional second arg TABLE is abbrev table to look it up in.
 646 The default is to try buffer's mode-specific abbrev table, then global table."
 647   (let ((tables (abbrev--active-tables table))
 648         sym)
 649     (while (and tables (not (symbol-value sym)))
 650       (let* ((table (pop tables))
 651              (case-fold (not (abbrev-table-get table :case-fixed))))
 652         (setq tables (append (abbrev-table-get table :parents) tables))
 653         ;; In case the table doesn't set :case-fixed but some of the
 654         ;; abbrevs do, we have to be careful.
 655         (setq sym
 656               ;; First try without case-folding.
 657               (or (intern-soft abbrev table)
 658                   (when case-fold
 659                     ;; We didn't find any abbrev, try case-folding.
 660                     (let ((sym (intern-soft (downcase abbrev) table)))
 661                       ;; Only use it if it doesn't require :case-fixed.
 662                       (and sym (not (abbrev-get sym :case-fixed))
 663                            sym)))))))
 664     (if (symbol-value sym)
 665         sym)))
 666
 667
 668 (defun abbrev-expansion (abbrev &optional table)
 669   "Return the string that ABBREV expands into in the current buffer.
 670 Optionally specify an abbrev table as second arg;
 671 then ABBREV is looked up in that table only."
 672   (symbol-value (abbrev-symbol abbrev table)))
 673
 674
 675 (defun abbrev--before-point ()
 676   "Try and find an abbrev before point.  Return it if found, nil otherwise."
 677   (unless (eq abbrev-start-location-buffer (current-buffer))
 678     (setq abbrev-start-location nil))
 679
 680   (let ((tables (abbrev--active-tables))
 681         (pos (point))
 682         start end name res)
 683
 684     (if abbrev-start-location
 685         (progn
 686           (setq start abbrev-start-location)
 687           (setq abbrev-start-location nil)
 688           ;; Remove the hyphen inserted by `abbrev-prefix-mark'.
 689           (if (and (< start (point-max))
 690                    (eq (char-after start) ?-))
 691               (delete-region start (1+ start)))
 692           (skip-syntax-backward " ")
 693           (setq end (point))
 694           (when (> end start)
 695             (setq name (buffer-substring start end))
 696             (goto-char pos)               ; Restore point.
 697             (list (abbrev-symbol name tables) name start end)))
 698
 699       (while (and tables (not (car res)))
 700         (let* ((table (pop tables))
 701                (enable-fun (abbrev-table-get table :enable-function)))
 702           (setq tables (append (abbrev-table-get table :parents) tables))
 703           (setq res
 704                 (and (or (not enable-fun) (funcall enable-fun))
 705                      (looking-back (or (abbrev-table-get table :regexp)
 706                                        "\\<\\(\\w+\\)\\W*")
 707                                    (line-beginning-position))
 708                      (setq start (match-beginning 1))
 709                      (setq end   (match-end 1))
 710                      (setq name  (buffer-substring start end))
 711                      (let ((abbrev (abbrev-symbol name table)))
 712                        (when abbrev
 713                          (setq enable-fun (abbrev-get abbrev :enable-function))
 714                          (and (or (not enable-fun) (funcall enable-fun))
 715                               ;; This will also look it up in parent tables.
 716                               ;; This is not on purpose, but it seems harmless.
 717                               (list abbrev name start end))))))
 718           ;; Restore point.
 719           (goto-char pos)))
 720       res)))
 721
 722 (defvar abbrev-expand-functions nil
 723   "Wrapper hook around `expand-abbrev'.
 724 The functions on this special hook are called with one argument:
 725 a function that performs the abbrev expansion.  It should return
 726 the abbrev symbol if expansion took place.")
 727
 728 (defun expand-abbrev ()
 729   "Expand the abbrev before point, if there is an abbrev there.
 730 Effective when explicitly called even when `abbrev-mode' is nil.
 731 Returns the abbrev symbol, if expansion took place."
 732   (interactive)
 733   (run-hooks 'pre-abbrev-expand-hook)
 734   (abbrev-with-wrapper-hook abbrev-expand-functions
 735     (destructuring-bind (&optional sym name wordstart wordend)
 736         (abbrev--before-point)
 737       (when sym
 738         (let ((value sym))
 739           (unless (or ;; executing-kbd-macro
 740                    noninteractive
 741                    (window-minibuffer-p (selected-window)))
 742             ;; Add an undo boundary, in case we are doing this for
 743             ;; a self-inserting command which has avoided making one so far.
 744             (undo-boundary))
 745           ;; Now sym is the abbrev symbol.
 746           (setq last-abbrev-text name)
 747           (setq last-abbrev sym)
 748           (setq last-abbrev-location wordstart)
 749           ;; Increment use count.
 750           (abbrev-put sym :count (1+ (abbrev-get sym :count)))
 751           ;; If this abbrev has an expansion, delete the abbrev
 752           ;; and insert the expansion.
 753           (when (stringp (symbol-value sym))
 754             (goto-char wordstart)
 755             ;; Insert at beginning so that markers at the end (e.g. point)
 756             ;; are preserved.
 757             (insert (symbol-value sym))
 758             (delete-char (- wordend wordstart))
 759             (let ((case-fold-search nil))
 760               ;; If the abbrev's name is different from the buffer text (the
 761               ;; only difference should be capitalization), then we may want
 762               ;; to adjust the capitalization of the expansion.
 763               (when (and (not (equal name (symbol-name sym)))
 764                          (string-match "[[:upper:]]" name))
 765                 (if (not (string-match "[[:lower:]]" name))
 766                     ;; Abbrev was all caps.  If expansion is multiple words,
 767                     ;; normally capitalize each word.
 768                     (if (and (not abbrev-all-caps)
 769                              (save-excursion
 770                                (> (progn (backward-word 1) (point))
 771                                   (progn (goto-char wordstart)
 772                                          (forward-word 1) (point)))))
 773                         (upcase-initials-region wordstart (point))
 774                       (upcase-region wordstart (point)))
 775                   ;; Abbrev included some caps.  Cap first initial of expansion.
 776                   (let ((end (point)))
 777                     ;; Find the initial.
 778                     (goto-char wordstart)
 779                     (skip-syntax-forward "^w" (1- end))
 780                     ;; Change just that.
 781                     (upcase-initials-region (point) (1+ (point)))
 782                     (goto-char end))))))
 783           ;; Now point is at the end of the expansion and the beginning is
 784           ;; in last-abbrev-location.
 785           (when (symbol-function sym)
 786             (let* ((hook (symbol-function sym))
 787                    (expanded
 788                     ;; If the abbrev has a hook function, run it.
 789                     (funcall hook)))
 790               ;; In addition, if the hook function is a symbol with
 791               ;; a non-nil `no-self-insert' property, let the value it
 792               ;; returned specify whether we consider that an expansion took
 793               ;; place.  If it returns nil, no expansion has been done.
 794               (if (and (symbolp hook)
 795                        (null expanded)
 796                        (get hook 'no-self-insert))
 797                   (setq value nil))))
 798           value)))))
 799
 800 (defun unexpand-abbrev ()
 801   "Undo the expansion of the last abbrev that expanded.
 802 This differs from ordinary undo in that other editing done since then
 803 is not undone."
 804   (interactive)
 805   (save-excursion
 806     (unless (or (< last-abbrev-location (point-min))
 807                 (> last-abbrev-location (point-max)))
 808       (goto-char last-abbrev-location)
 809       (when (stringp last-abbrev-text)
 810         ;; This isn't correct if last-abbrev's hook was used
 811         ;; to do the expansion.
 812         (let ((val (symbol-value last-abbrev)))
 813           (unless (stringp val)
 814             (error "value of abbrev-symbol must be a string"))
 815           (delete-region (point) (+ (point) (length val)))
 816           ;; Don't inherit properties here; just copy from old contents.
 817           (insert last-abbrev-text)
 818           (setq last-abbrev-text nil))))))
 819
 820 (defun abbrev--write (sym)
 821   "Write the abbrev in a `read'able form.
 822 Only writes the non-system abbrevs.
 823 Presumes that `standard-output' points to `current-buffer'."
 824   (unless (or (null (symbol-value sym)) (abbrev-get sym :system))
 825     (insert "    (")
 826     (prin1 (symbol-name sym))
 827     (insert " ")
 828     (prin1 (symbol-value sym))
 829     (insert " ")
 830     (prin1 (symbol-function sym))
 831     (insert " ")
 832     (prin1 (abbrev-get sym :count))
 833     (insert ")\n")))
 834
 835 (defun abbrev--describe (sym)
 836   (when (symbol-value sym)
 837     (prin1 (symbol-name sym))
 838     (if (null (abbrev-get sym :system))
 839         (indent-to 15 1)
 840       (insert " (sys)")
 841       (indent-to 20 1))
 842     (prin1 (abbrev-get sym :count))
 843     (indent-to 20 1)
 844     (prin1 (symbol-value sym))
 845     (when (symbol-function sym)
 846       (indent-to 45 1)
 847       (prin1 (symbol-function sym)))
 848     (terpri)))
 849
 850 (defun insert-abbrev-table-description (name &optional readable)
 851   "Insert before point a full description of abbrev table named NAME.
 852 NAME is a symbol whose value is an abbrev table.
 853 If optional 2nd arg READABLE is non-nil, a human-readable description
 854 is inserted.  Otherwise the description is an expression,
 855 a call to `define-abbrev-table', which would
 856 define the abbrev table NAME exactly as it is currently defined.
 857
 858 Abbrevs marked as \"system abbrevs\" are omitted."
 859   (let ((table (symbol-value name))
 860         (symbols ()))
 861     (mapatoms (lambda (sym) (if (symbol-value sym) (push sym symbols))) table)
 862     (setq symbols (sort symbols 'string-lessp))
 863     (let ((standard-output (current-buffer)))
 864       (if readable
 865           (progn
 866             (insert "(")
 867             (prin1 name)
 868             (insert ")\n\n")
 869             (mapc 'abbrev--describe symbols)
 870             (insert "\n\n"))
 871         (insert "(define-abbrev-table '")
 872         (prin1 name)
 873         (insert " '(")
 874         (mapc 'abbrev--write symbols)
 875         (insert "    ))\n\n"))
 876       nil)))
 877
 878 (defun define-abbrev-table (tablename definitions
 879                                       &optional docstring &rest props)
 880   "Define TABLENAME (a symbol) as an abbrev table name.
 881 Define abbrevs in it according to DEFINITIONS, which is a list of elements
 882 of the form (ABBREVNAME EXPANSION HOOK USECOUNT SYSTEMFLAG).
 883 \(If the list is shorter than that, omitted elements default to nil).
 884 PROPS is a property list to apply to the table.
 885 Properties with special meaning:
 886 - `:parents' contains a list of abbrev tables from which this table inherits
 887   abbreviations.
 888 - `:case-fixed' non-nil means that abbreviations are looked up without
 889   case-folding, and the expansion is not capitalized/upcased.
 890 - `:regexp' describes the form of abbrevs.  It defaults to \\=\\<\\(\\w+\\)\\W* which
 891   means that an abbrev can only be a single word.  The submatch 1 is treated
 892   as the potential name of an abbrev.
 893 - `:enable-function' can be set to a function of no argument which returns
 894   non-nil iff the abbrevs in this table should be used for this instance
 895   of `expand-abbrev'."
 896   ;; We used to manually add the docstring, but we also want to record this
 897   ;; location as the definition of the variable (in load-history), so we may
 898   ;; as well just use `defvar'.
 899   (eval `(defvar ,tablename nil ,@(if (stringp docstring) (list docstring))))
 900   (let ((table (if (boundp tablename) (symbol-value tablename))))
 901     (unless table
 902       (setq table (make-abbrev-table props))
 903       (set tablename table)
 904       (push tablename abbrev-table-name-list))
 905     (dolist (elt definitions)
 906       (apply 'define-abbrev table elt))))
 907
 908 (provide 'abbrev)
 909
 910 ;; arch-tag: dbd6f3ae-dfe3-40ba-b00f-f9e3ff960df5
 911 ;;; abbrev.el ends here