lisp/complete.el

   1 ;;; complete.el -- partial completion mechanism plus other goodies
   2
   3 ;; Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
   4
   5 ;; Author: Dave Gillespie <daveg@synaptics.com>
   6 ;; Keywords: abbrev
   7 ;; Version: 2.02
   8 ;; Special thanks to Hallvard Furuseth for his many ideas and contributions.
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software; you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation; either version 2, or (at your option)
  15 ;; any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  25 ;; Boston, MA 02111-1307, USA.
  26
  27 ;;; Commentary:
  28
  29 ;; Extended completion for the Emacs minibuffer.
  30 ;;
  31 ;; The basic idea is that the command name or other completable text is
  32 ;; divided into words and each word is completed separately, so that
  33 ;; "M-x p-b" expands to "M-x print-buffer".  If the entry is ambiguous
  34 ;; each word is completed as much as possible and then the cursor is
  35 ;; left at the first position where typing another letter will resolve
  36 ;; the ambiguity.
  37 ;;
  38 ;; Word separators for this purpose are hyphen, space, and period.
  39 ;; These would most likely occur in command names, Info menu items,
  40 ;; and file names, respectively.  But all word separators are treated
  41 ;; alike at all times.
  42 ;;
  43 ;; This completion package replaces the old-style completer's key
  44 ;; bindings for TAB, SPC, RET, and `?'.  The old completer is still
  45 ;; available on the Meta versions of those keys.  If you set
  46 ;; PC-meta-flag to nil, the old completion keys will be left alone
  47 ;; and the partial completer will use the Meta versions of the keys.
  48
  49
  50 ;; Usage:  Load this file.  Now, during completable minibuffer entry,
  51 ;;
  52 ;;     TAB    means to do a partial completion;
  53 ;;     SPC    means to do a partial complete-word;
  54 ;;     RET    means to do a partial complete-and-exit;
  55 ;;     ?      means to do a partial completion-help.
  56 ;;
  57 ;; If you set PC-meta-flag to nil, then TAB, SPC, RET, and ? perform
  58 ;; original Emacs completions, and M-TAB etc. do partial completion.
  59 ;; To do this, put the command,
  60 ;;
  61 ;;       (setq PC-meta-flag nil)
  62 ;;
  63 ;; in your .emacs file.  To load partial completion automatically, put
  64 ;;
  65 ;;       (load "complete")
  66 ;;
  67 ;; in your .emacs file, too.  Things will be faster if you byte-compile
  68 ;; this file when you install it.
  69 ;;
  70 ;; As an extra feature, in cases where RET would not normally
  71 ;; complete (such as `C-x b'), the M-RET key will always do a partial
  72 ;; complete-and-exit.  Thus `C-x b f.c RET' will select or create a
  73 ;; buffer called "f.c", but `C-x b f.c M-RET' will select the existing
  74 ;; buffer whose name matches that pattern (perhaps "filing.c").
  75 ;; (PC-meta-flag does not affect this behavior; M-RET used to be
  76 ;; undefined in this situation.)
  77 ;;
  78 ;; The regular M-TAB (lisp-complete-symbol) command also supports
  79 ;; partial completion in this package.
  80
  81 ;; This package also contains a wildcard feature for C-x C-f (find-file).
  82 ;; For example, `C-x C-f *.c RET' loads all .c files at once, exactly
  83 ;; as if you had typed C-x C-f separately for each file.  Completion
  84 ;; is supported in connection with wildcards.  Currently only the `*'
  85 ;; wildcard character works.
  86
  87 ;; File name completion does not do partial completion of directories
  88 ;; on the path, e.g., "/u/b/f" will not complete to "/usr/bin/foo",
  89 ;; but you can put *'s in the path to accomplish this:  "/u*/b*/f".
  90 ;; Stars are required for performance reasons.
  91
  92 ;; In addition, this package includes a feature for accessing include
  93 ;; files.  For example, `C-x C-f <sys/time.h> RET' reads the file
  94 ;; /usr/include/sys/time.h.  The variable PC-include-file-path is a
  95 ;; list of directories in which to search for include files.  Completion
  96 ;; is supported in include file names.
  97
  98
  99 ;;; Code:
 100
 101 (defvar PC-meta-flag t
 102   "*If nil, TAB does normal Emacs completion and M-TAB does Partial Completion.
 103 If t, TAB does Partial Completion and M-TAB does normal completion.")
 104
 105
 106 (defvar PC-word-delimiters "-_. "
 107   "*A string of characters which are to be treated as word delimiters
 108 by the Partial Completion system.
 109
 110 Some arcane rules:  If `]' is in this string it must come first.
 111 If `^' is in this string it must NOT come first.  If `-' is in this
 112 string, it must come first or right after `]'.  In other words, if
 113 S is this string, then `[S]' must be a legal Emacs regular expression
 114 \(not containing character ranges like `a-z').")
 115
 116
 117 (defvar PC-first-char 'x
 118   "*If t, first character of a string to be completed is always taken literally.
 119 If nil, word delimiters are handled even if they appear as first character.
 120 This controls whether \".e\" matches \".e*\" (t) or \"*.e*\" (nil).
 121 If neither nil nor t, first char is literal only for filename completion.")
 122
 123
 124 (defvar PC-include-file-path '("/usr/include")
 125   "*List of directories in which to look for include files.
 126 If this is nil, uses the colon-separated path in $INCPATH instead.")
 127
 128
 129 (defvar PC-disable-wildcards nil
 130   "Set this to non-nil to disable wildcard support in \\[find-file].")
 131
 132 (defvar PC-disable-includes nil
 133   "Set this to non-nil to disable include-file support in \\[find-file].")
 134
 135
 136 (defvar PC-default-bindings t
 137   "Set this to nil to suppress the default partial completion key bindings.")
 138
 139 (if PC-default-bindings (progn
 140 (define-key minibuffer-local-completion-map "\t" 'PC-complete)
 141 (define-key minibuffer-local-completion-map " "  'PC-complete-word)
 142 (define-key minibuffer-local-completion-map "?"  'PC-completion-help)
 143
 144 (define-key minibuffer-local-completion-map "\e\t" 'PC-complete)
 145 (define-key minibuffer-local-completion-map "\e "  'PC-complete-word)
 146 (define-key minibuffer-local-completion-map "\e\r" 'PC-force-complete-and-exit)
 147 (define-key minibuffer-local-completion-map "\e\n" 'PC-force-complete-and-exit)
 148 (define-key minibuffer-local-completion-map "\e?"  'PC-completion-help)
 149
 150 (define-key minibuffer-local-must-match-map "\t" 'PC-complete)
 151 (define-key minibuffer-local-must-match-map " "  'PC-complete-word)
 152 (define-key minibuffer-local-must-match-map "\r" 'PC-complete-and-exit)
 153 (define-key minibuffer-local-must-match-map "\n" 'PC-complete-and-exit)
 154 (define-key minibuffer-local-must-match-map "?"  'PC-completion-help)
 155
 156 (define-key minibuffer-local-must-match-map "\e\t" 'PC-complete)
 157 (define-key minibuffer-local-must-match-map "\e "  'PC-complete-word)
 158 (define-key minibuffer-local-must-match-map "\e\r" 'PC-complete-and-exit)
 159 (define-key minibuffer-local-must-match-map "\e\n" 'PC-complete-and-exit)
 160 (define-key minibuffer-local-must-match-map "\e?"  'PC-completion-help)
 161
 162 (define-key global-map "\e\t" 'PC-lisp-complete-symbol)
 163 ))
 164
 165
 166 (defun PC-complete ()
 167   "Like minibuffer-complete, but allows \"b--di\"-style abbreviations.
 168 For example, \"M-x b--di\" would match `byte-recompile-directory', or any
 169 name which consists of three or more words, the first beginning with \"b\"
 170 and the third beginning with \"di\".
 171
 172 The pattern \"b--d\" is ambiguous for `byte-recompile-directory' and
 173 `beginning-of-defun', so this would produce a list of completions
 174 just like when normal Emacs completions are ambiguous.
 175
 176 Word-delimiters for the purposes of Partial Completion are \"-\", \"_\",
 177 \".\", and SPC."
 178   (interactive)
 179   (if (PC-was-meta-key)
 180       (minibuffer-complete)
 181     (PC-do-completion nil)))
 182
 183
 184 (defun PC-complete-word ()
 185   "Like `minibuffer-complete-word', but allows \"b--di\"-style abbreviations.
 186 See `PC-complete' for details.
 187 This can be bound to other keys, like `-' and `.', if you wish."
 188   (interactive)
 189   (if (eq (PC-was-meta-key) PC-meta-flag)
 190       (if (eq last-command-char ? )
 191           (minibuffer-complete-word)
 192         (self-insert-command 1))
 193     (self-insert-command 1)
 194     (if (eobp)
 195         (PC-do-completion 'word))))
 196
 197
 198 (defun PC-complete-space ()
 199   "Like `minibuffer-complete-word', but allows \"b--di\"-style abbreviations.
 200 See `PC-complete' for details.
 201 This is suitable for binding to other keys which should act just like SPC."
 202   (interactive)
 203   (if (eq (PC-was-meta-key) PC-meta-flag)
 204       (minibuffer-complete-word)
 205     (insert " ")
 206     (if (eobp)
 207         (PC-do-completion 'word))))
 208
 209
 210 (defun PC-complete-and-exit ()
 211   "Like `minibuffer-complete-and-exit', but allows \"b--di\"-style abbreviations.
 212 See `PC-complete' for details."
 213   (interactive)
 214   (if (eq (PC-was-meta-key) PC-meta-flag)
 215       (minibuffer-complete-and-exit)
 216     (PC-do-complete-and-exit)))
 217
 218 (defun PC-force-complete-and-exit ()
 219   "Like `minibuffer-complete-and-exit', but allows \"b--di\"-style abbreviations.
 220 See `PC-complete' for details."
 221   (interactive)
 222   (let ((minibuffer-completion-confirm nil))
 223     (PC-do-complete-and-exit)))
 224
 225 (defun PC-do-complete-and-exit ()
 226   (if (= (buffer-size) 0)  ; Duplicate the "bug" that Info-menu relies on...
 227       (exit-minibuffer)
 228     (let ((flag (PC-do-completion 'exit)))
 229       (and flag
 230            (if (or (eq flag 'complete)
 231                    (not minibuffer-completion-confirm))
 232                (exit-minibuffer)
 233              (PC-temp-minibuffer-message " [Confirm]"))))))
 234
 235
 236 (defun PC-completion-help ()
 237   "Like `minibuffer-completion-help', but allows \"b--di\"-style abbreviations.
 238 See `PC-complete' for details."
 239   (interactive)
 240   (if (eq (PC-was-meta-key) PC-meta-flag)
 241       (minibuffer-completion-help)
 242     (PC-do-completion 'help)))
 243
 244 (defun PC-was-meta-key ()
 245   (or (/= (length (this-command-keys)) 1)
 246       (let ((key (aref (this-command-keys) 0)))
 247         (if (integerp key)
 248             (>= key 128)
 249           (not (null (memq 'meta (event-modifiers key))))))))
 250
 251
 252 (defvar PC-ignored-extensions 'empty-cache)
 253 (defvar PC-delims 'empty-cache)
 254 (defvar PC-ignored-regexp nil)
 255 (defvar PC-word-failed-flag nil)
 256 (defvar PC-delim-regex nil)
 257 (defvar PC-ndelims-regex nil)
 258 (defvar PC-delims-list nil)
 259
 260 (defun PC-do-completion (&optional mode beg end)
 261   (or beg (setq beg (point-min)))
 262   (or end (setq end (point-max)))
 263   (let* ((table minibuffer-completion-table)
 264          (pred minibuffer-completion-predicate)
 265          (filename (memq table '(read-file-name-internal
 266                                  read-directory-name-internal)))
 267          (dirname nil)
 268          dirlength
 269          (str (buffer-substring beg end))
 270          (incname (and filename (string-match "<\\([^\"<>]*\\)>?$" str)))
 271          (ambig nil)
 272          basestr
 273          regex
 274          p offset
 275          (poss nil)
 276          helpposs
 277          (case-fold-search completion-ignore-case))
 278
 279     ;; Check if buffer contents can already be considered complete
 280     (if (and (eq mode 'exit)
 281              (PC-is-complete-p str table pred))
 282         'complete
 283
 284       ;; Record how many characters at the beginning are not included
 285       ;; in completion.
 286       (setq dirlength
 287             (if filename
 288                 (length (file-name-directory str))
 289               0))
 290
 291       ;; Do substitutions in directory names
 292       (and filename
 293            (not (equal str (setq p (substitute-in-file-name str))))
 294            (progn
 295              (delete-region beg end)
 296              (insert p)
 297              (setq str p end (+ beg (length str)))))
 298
 299       ;; Prepare various delimiter strings
 300       (or (equal PC-word-delimiters PC-delims)
 301           (setq PC-delims PC-word-delimiters
 302                 PC-delim-regex (concat "[" PC-delims "]")
 303                 PC-ndelims-regex (concat "[^" PC-delims "]*")
 304                 PC-delims-list (append PC-delims nil)))
 305
 306       ;; Look for wildcard expansions in directory name
 307       (and filename
 308            (string-match "\\*.*/" str)
 309            (let ((pat str)
 310                  files)
 311              (setq p (1+ (string-match "/[^/]*\\'" pat)))
 312              (while (setq p (string-match PC-delim-regex pat p))
 313                (setq pat (concat (substring pat 0 p)
 314                                  "*"
 315                                  (substring pat p))
 316                      p (+ p 2)))
 317              (setq files (PC-expand-many-files (concat pat "*")))
 318              (if files
 319                  (let ((dir (file-name-directory (car files)))
 320                        (p files))
 321                    (while (and (setq p (cdr p))
 322                                (equal dir (file-name-directory (car p)))))
 323                    (if p
 324                        (setq filename nil table nil pred nil
 325                              ambig t)
 326                      (delete-region beg end)
 327                      (setq str (concat dir (file-name-nondirectory str)))
 328                      (insert str)
 329                      (setq end (+ beg (length str)))))
 330                (setq filename nil table nil pred nil))))
 331
 332       ;; Strip directory name if appropriate
 333       (if filename
 334           (if incname
 335               (setq basestr (substring str incname)
 336                     dirname (substring str 0 incname))
 337             (setq basestr (file-name-nondirectory str)
 338                   dirname (file-name-directory str)))
 339         (setq basestr str))
 340
 341       ;; Convert search pattern to a standard regular expression
 342       (setq regex (regexp-quote basestr)
 343             offset (if (and (> (length regex) 0)
 344                             (not (eq (aref basestr 0) ?\*))
 345                             (or (eq PC-first-char t)
 346                                 (and PC-first-char filename))) 1 0)
 347             p offset)
 348       (while (setq p (string-match PC-delim-regex regex p))
 349         (if (eq (aref regex p) ? )
 350             (setq regex (concat (substring regex 0 p)
 351                                 PC-ndelims-regex
 352                                 PC-delim-regex
 353                                 (substring regex (1+ p)))
 354                   p (+ p (length PC-ndelims-regex) (length PC-delim-regex)))
 355           (let ((bump (if (memq (aref regex p)
 356                                 '(?$ ?^ ?\. ?* ?+ ?? ?[ ?] ?\\))
 357                           -1 0)))
 358             (setq regex (concat (substring regex 0 (+ p bump))
 359                                 PC-ndelims-regex
 360                                 (substring regex (+ p bump)))
 361                   p (+ p (length PC-ndelims-regex) 1)))))
 362       (setq p 0)
 363       (if filename
 364           (while (setq p (string-match "\\\\\\*" regex p))
 365             (setq regex (concat (substring regex 0 p)
 366                                 "[^/]*"
 367                                 (substring regex (+ p 2))))))
 368       ;;(setq the-regex regex)
 369       (setq regex (concat "\\`" regex))
 370
 371       ;; Find an initial list of possible completions
 372       (if (not (setq p (string-match (concat PC-delim-regex
 373                                              (if filename "\\|\\*" ""))
 374                                      str
 375                                      (+ (length dirname) offset))))
 376
 377           ;; Minibuffer contains no hyphens -- simple case!
 378           (setq poss (all-completions str
 379                                       table
 380                                       pred))
 381
 382         ;; Use all-completions to do an initial cull.  This is a big win,
 383         ;; since all-completions is written in C!
 384         (let ((compl (all-completions (substring str 0 p)
 385                                       table
 386                                       pred)))
 387           (setq p compl)
 388           (while p
 389             (and (string-match regex (car p))
 390                  (setq poss (cons (car p) poss)))
 391             (setq p (cdr p)))))
 392
 393       ;; Now we have a list of possible completions
 394       (cond
 395
 396        ;; No valid completions found
 397        ((null poss)
 398         (if (and (eq mode 'word)
 399                  (not PC-word-failed-flag))
 400             (let ((PC-word-failed-flag t))
 401               (delete-backward-char 1)
 402               (PC-do-completion 'word))
 403           (beep)
 404           (PC-temp-minibuffer-message (if ambig
 405                                           " [Ambiguous dir name]"
 406                                         (if (eq mode 'help)
 407                                             " [No completions]"
 408                                           " [No match]")))
 409           nil))
 410
 411        ;; More than one valid completion found
 412        ((or (cdr (setq helpposs poss))
 413             (memq mode '(help word)))
 414
 415         ;; Handle completion-ignored-extensions
 416         (and filename
 417              (not (eq mode 'help))
 418              (let ((p2 poss))
 419
 420                ;; Build a regular expression representing the extensions list
 421                (or (equal completion-ignored-extensions PC-ignored-extensions)
 422                    (setq PC-ignored-regexp
 423                          (concat "\\("
 424                                  (mapconcat
 425                                   'regexp-quote
 426                                   (setq PC-ignored-extensions
 427                                         completion-ignored-extensions)
 428                                   "\\|")
 429                                  "\\)\\'")))
 430
 431                ;; Check if there are any without an ignored extension
 432                (setq p nil)
 433                (while p2
 434                  (or (string-match PC-ignored-regexp (car p2))
 435                      (setq p (cons (car p2) p)))
 436                  (setq p2 (cdr p2)))
 437
 438                ;; If there are "good" names, use them
 439                (and p (setq poss p))))
 440
 441         ;; Is the actual string one of the possible completions?
 442         (setq p (and (not (eq mode 'help)) poss))
 443         (while (and p
 444                     (not (equal (car p) basestr)))
 445           (setq p (cdr p)))
 446         (and p (null mode)
 447              (PC-temp-minibuffer-message " [Complete, but not unique]"))
 448         (if (and p
 449                  (not (and (null mode)
 450                            (eq this-command last-command))))
 451             t
 452
 453           ;; If ambiguous, try for a partial completion
 454           (let ((improved nil)
 455                 prefix
 456                 (pt nil)
 457                 (skip "\\`"))
 458
 459             ;; Check if next few letters are the same in all cases
 460             (if (and (not (eq mode 'help))
 461                      (setq prefix (try-completion "" (mapcar 'list poss))))
 462                 (let ((first t) i)
 463                   (if (eq mode 'word)
 464                       (setq prefix (PC-chop-word prefix basestr)))
 465                   (goto-char (+ beg (length dirname)))
 466                   (while (and (progn
 467                                 (setq i 0)
 468                                 (while (< i (length prefix))
 469                                   (if (and (< (point) end)
 470                                            (eq (aref prefix i)
 471                                                (following-char)))
 472                                       (forward-char 1)
 473                                     (if (and (< (point) end)
 474                                              (or (and (looking-at " ")
 475                                                       (memq (aref prefix i)
 476                                                             PC-delims-list))
 477                                                  (eq (downcase (aref prefix i))
 478                                                      (downcase
 479                                                       (following-char)))))
 480                                         (progn
 481                                           (delete-char 1)
 482                                           (setq end (1- end)))
 483                                       (and filename (looking-at "\\*")
 484                                            (progn
 485                                              (delete-char 1)
 486                                              (setq end (1- end))))
 487                                       (setq improved t))
 488                                     ;; Use format to discard text properties.
 489                                     (insert (format "%s" (substring prefix i (1+ i))))
 490                                     (setq end (1+ end)))
 491                                   (setq i (1+ i)))
 492                                 (or pt (equal (point) beg)
 493                                     (setq pt (point)))
 494                                 (looking-at PC-delim-regex))
 495                               (setq skip (concat skip
 496                                                  (regexp-quote prefix)
 497                                                  PC-ndelims-regex)
 498                                     prefix (try-completion
 499                                             ""
 500                                             (mapcar
 501                                              (function
 502                                               (lambda (x)
 503                                                 (list
 504                                                  (and (string-match skip x)
 505                                                       (substring
 506                                                        x
 507                                                        (match-end 0))))))
 508                                              poss)))
 509                               (or (> i 0) (> (length prefix) 0))
 510                               (or (not (eq mode 'word))
 511                                   (and first (> (length prefix) 0)
 512                                        (setq first nil
 513                                              prefix (substring prefix 0 1))))))
 514                   (goto-char (if (eq mode 'word) end
 515                                (or pt beg)))))
 516
 517             (if (and (eq mode 'word)
 518                      (not PC-word-failed-flag))
 519
 520                 (if improved
 521
 522                     ;; We changed it... would it be complete without the space?
 523                     (if (PC-is-complete-p (buffer-substring 1 (1- end))
 524                                           table pred)
 525                         (delete-region (1- end) end)))
 526
 527               (if improved
 528
 529                   ;; We changed it... enough to be complete?
 530                   (and (eq mode 'exit)
 531                        (PC-is-complete-p (buffer-string) table pred))
 532
 533                 ;; If totally ambiguous, display a list of completions
 534                 (if (or completion-auto-help
 535                         (eq mode 'help))
 536                     (with-output-to-temp-buffer "*Completions*"
 537                       (display-completion-list (sort helpposs 'string-lessp))
 538                       (save-excursion
 539                         (set-buffer standard-output)
 540                         ;; Record which part of the buffer we are completing
 541                         ;; so that choosing a completion from the list
 542                         ;; knows how much old text to replace.
 543                         (setq completion-base-size dirlength)))
 544                   (PC-temp-minibuffer-message " [Next char not unique]"))
 545                 nil)))))
 546
 547        ;; Only one possible completion
 548        (t
 549         (if (equal basestr (car poss))
 550             (if (null mode)
 551                 (PC-temp-minibuffer-message " [Sole completion]"))
 552           (delete-region beg end)
 553           (insert (format "%s"
 554                           (if filename
 555                               (substitute-in-file-name (concat dirname (car poss)))
 556                             (car poss)))))
 557         t)))))
 558
 559
 560 (defun PC-is-complete-p (str table pred)
 561   (let ((res (if (listp table)
 562                  (assoc str table)
 563                (if (vectorp table)
 564                    (or (equal str "nil")   ; heh, heh, heh
 565                        (intern-soft str table))
 566                  (funcall table str pred 'lambda)))))
 567     (and res
 568          (or (not pred)
 569              (and (not (listp table)) (not (vectorp table)))
 570              (funcall pred res))
 571          res)))
 572
 573 (defun PC-chop-word (new old)
 574   (let ((i -1)
 575         (j -1))
 576     (while (and (setq i (string-match PC-delim-regex old (1+ i)))
 577                 (setq j (string-match PC-delim-regex new (1+ j)))))
 578     (if (and j
 579              (or (not PC-word-failed-flag)
 580                  (setq j (string-match PC-delim-regex new (1+ j)))))
 581         (substring new 0 (1+ j))
 582       new)))
 583
 584 (defvar PC-not-minibuffer nil)
 585
 586 (defun PC-temp-minibuffer-message (m)
 587   "A Lisp version of `temp_minibuffer_message' from minibuf.c."
 588   (if PC-not-minibuffer
 589       (progn
 590         (message m)
 591         (sit-for 2)
 592         (message ""))
 593     (if (fboundp 'temp-minibuffer-message)
 594         (temp-minibuffer-message m)
 595       (let ((savemax (point-max)))
 596         (save-excursion
 597           (goto-char (point-max))
 598           (insert m))
 599         (let ((inhibit-quit t))
 600           (sit-for 2)
 601           (delete-region savemax (point-max))
 602           (if quit-flag
 603               (setq quit-flag nil
 604                     unread-command-char 7)))))))
 605
 606
 607 (defun PC-lisp-complete-symbol ()
 608   "Perform completion on Lisp symbol preceding point.
 609 That symbol is compared against the symbols that exist
 610 and any additional characters determined by what is there
 611 are inserted.
 612 If the symbol starts just after an open-parenthesis,
 613 only symbols with function definitions are considered.
 614 Otherwise, all symbols with function definitions, values
 615 or properties are considered."
 616   (interactive)
 617   (let* ((end (point))
 618          (buffer-syntax (syntax-table))
 619          (beg (unwind-protect
 620                   (save-excursion
 621                     (if lisp-mode-syntax-table
 622                         (set-syntax-table lisp-mode-syntax-table))
 623                     (backward-sexp 1)
 624                     (while (= (char-syntax (following-char)) ?\')
 625                       (forward-char 1))
 626                     (point))
 627                 (set-syntax-table buffer-syntax)))
 628          (minibuffer-completion-table obarray)
 629          (minibuffer-completion-predicate
 630           (if (eq (char-after (1- beg)) ?\()
 631               'fboundp
 632             (function (lambda (sym)
 633                         (or (boundp sym) (fboundp sym)
 634                             (symbol-plist sym))))))
 635          (PC-not-minibuffer t))
 636     (PC-do-completion nil beg end)))
 637
 638
 639 ;;; Wildcards in `C-x C-f' command.  This is independent from the main
 640 ;;; completion code, except for `PC-expand-many-files' which is called
 641 ;;; when "*"'s are found in the path during filename completion.  (The
 642 ;;; above completion code always understands "*"'s, except in file paths,
 643 ;;; without relying on the following code.)
 644
 645 (defvar PC-many-files-list nil)
 646
 647 (defun PC-try-load-many-files ()
 648   (if (string-match "\\*" buffer-file-name)
 649       (let* ((pat buffer-file-name)
 650              (files (PC-expand-many-files pat))
 651              (first (car files))
 652              (next files))
 653         (kill-buffer (current-buffer))
 654         (or files
 655             (error "No matching files"))
 656         (save-window-excursion
 657           (while (setq next (cdr next))
 658             (let ((buf (find-file-noselect (car next))))
 659               (switch-to-buffer buf))))
 660         ;; This modifies the "buf" variable inside find-file-noselect.
 661         (setq buf (get-file-buffer first))
 662         (if buf
 663             nil   ; should do verify-visited-file-modtime stuff.
 664           (setq filename first)
 665           (setq buf (create-file-buffer filename))
 666           (set-buffer buf)
 667           (erase-buffer)
 668           (insert-file-contents filename t))
 669         (if (cdr files)
 670             (setq PC-many-files-list (mapconcat
 671                                       (if (string-match "\\*.*/" pat)
 672                                           'identity
 673                                         'file-name-nondirectory)
 674                                       (cdr files) ", ")
 675                   find-file-hooks (cons 'PC-after-load-many-files
 676                                         find-file-hooks)))
 677         ;; This modifies the "error" variable inside find-file-noselect.
 678         (setq error nil)
 679         t)
 680     nil))
 681
 682 (defun PC-after-load-many-files ()
 683   (setq find-file-hooks (delq 'PC-after-load-many-files find-file-hooks))
 684   (message "Also loaded %s." PC-many-files-list))
 685
 686 (defun PC-expand-many-files (name)
 687   (save-excursion
 688     (set-buffer (generate-new-buffer " *Glob Output*"))
 689     (erase-buffer)
 690     (shell-command (concat "echo " name) t)
 691     (goto-char (point-min))
 692     (if (looking-at ".*No match")
 693         nil
 694       (insert "(\"")
 695       (while (search-forward " " nil t)
 696         (delete-backward-char 1)
 697         (insert "\" \""))
 698       (goto-char (point-max))
 699       (delete-backward-char 1)
 700       (insert "\")")
 701       (goto-char (point-min))
 702       (let ((files (read (current-buffer))))
 703         (kill-buffer (current-buffer))
 704         files))))
 705
 706 (or PC-disable-wildcards
 707     (memq 'PC-try-load-many-files find-file-not-found-hooks)
 708     (setq find-file-not-found-hooks (cons 'PC-try-load-many-files
 709                                           find-file-not-found-hooks)))
 710
 711
 712
 713 ;;; Facilities for loading C header files.  This is independent from the
 714 ;;; main completion code.  See also the variable `PC-include-file-path'
 715 ;;; at top of this file.
 716
 717 (defun PC-look-for-include-file ()
 718   (if (string-match "[\"<]\\([^\"<>]*\\)[\">]?$" (buffer-file-name))
 719       (let ((name (substring (buffer-file-name)
 720                              (match-beginning 1) (match-end 1)))
 721             (punc (aref (buffer-file-name) (match-beginning 0)))
 722             (path nil)
 723             new-buf)
 724         (kill-buffer (current-buffer))
 725         (if (equal name "")
 726             (save-excursion
 727               (set-buffer (car (buffer-list)))
 728               (save-excursion
 729                 (beginning-of-line)
 730                 (if (looking-at
 731                      "[ \t]*#[ \t]*include[ \t]+[<\"]\\(.+\\)[>\"][ \t]*[\n/]")
 732                     (setq name (buffer-substring (match-beginning 1)
 733                                                  (match-end 1))
 734                           punc (char-after (1- (match-beginning 1))))
 735                   ;; Suggested by Frank Siebenlist:
 736                   (if (or (looking-at
 737                            "[ \t]*([ \t]*load[ \t]+\"\\([^\"]+\\)\"")
 738                           (looking-at
 739                            "[ \t]*([ \t]*load-library[ \t]+\"\\([^\"]+\\)\"")
 740                           (looking-at
 741                            "[ \t]*([ \t]*require[ \t]+'\\([^\t )]+\\)[\t )]"))
 742                       (progn
 743                         (setq name (buffer-substring (match-beginning 1)
 744                                                      (match-end 1))
 745                               punc ?\<
 746                               path load-path)
 747                         (if (string-match "\\.elc$" name)
 748                             (setq name (substring name 0 -1))
 749                           (or (string-match "\\.el$" name)
 750                               (setq name (concat name ".el")))))
 751                     (error "Not on an #include line"))))))
 752         (or (string-match "\\.[a-zA-Z0-9]+$" name)
 753             (setq name (concat name ".h")))
 754         (if (eq punc ?\<)
 755             (let ((path (or path (PC-include-file-path))))
 756               (while (and path
 757                           (not (file-exists-p
 758                                 (concat (file-name-as-directory (car path))
 759                                         name))))
 760                 (setq path (cdr path)))
 761               (if path
 762                   (setq name (concat (file-name-as-directory (car path)) name))
 763                 (error "No such include file: <%s>" name)))
 764           (let ((dir (save-excursion
 765                        (set-buffer (car (buffer-list)))
 766                        default-directory)))
 767             (if (file-exists-p (concat dir name))
 768                 (setq name (concat dir name))
 769               (error "No such include file: \"%s\"" name))))
 770         (setq new-buf (get-file-buffer name))
 771         (if new-buf
 772             ;; no need to verify last-modified time for this!
 773             (set-buffer new-buf)
 774           (setq new-buf (create-file-buffer name))
 775           (set-buffer new-buf)
 776           (erase-buffer)
 777           (insert-file-contents name t))
 778         (setq filename name
 779               error nil
 780               buf new-buf)
 781         t)
 782     nil))
 783
 784 (defun PC-include-file-path ()
 785   (or PC-include-file-path
 786       (let ((env (getenv "INCPATH"))
 787             (path nil)
 788             pos)
 789         (or env (error "No include file path specified"))
 790         (while (setq pos (string-match ":[^:]+$" env))
 791           (setq path (cons (substring env (1+ pos)) path)
 792                 env (substring env 0 pos)))
 793         path)))
 794
 795 ;;; This is adapted from lib-complete.el, by Mike Williams.
 796 (defun PC-include-file-all-completions (file search-path &optional full)
 797   "Return all completions for FILE in any directory on SEARCH-PATH.
 798 If optional third argument FULL is non-nil, returned pathnames should be
 799 absolute rather than relative to some directory on the SEARCH-PATH."
 800   (setq search-path
 801         (mapcar '(lambda (dir)
 802                    (if dir (file-name-as-directory dir) default-directory))
 803                 search-path))
 804   (if (file-name-absolute-p file)
 805       ;; It's an absolute file name, so don't need search-path
 806       (progn
 807         (setq file (expand-file-name file))
 808         (file-name-all-completions
 809          (file-name-nondirectory file) (file-name-directory file)))
 810     (let ((subdir (file-name-directory file))
 811           (ndfile (file-name-nondirectory file))
 812           file-lists)
 813       ;; Append subdirectory part to each element of search-path
 814       (if subdir
 815           (setq search-path
 816                 (mapcar '(lambda (dir) (concat dir subdir))
 817                         search-path)
 818                 file ))
 819       ;; Make list of completions in each directory on search-path
 820       (while search-path
 821         (let* ((dir (car search-path))
 822                (subdir (if full dir subdir)))
 823           (if (file-directory-p dir)
 824               (progn
 825                 (setq file-lists
 826                       (cons
 827                        (mapcar '(lambda (file) (concat subdir file))
 828                                (file-name-all-completions ndfile
 829                                                           (car search-path)))
 830                        file-lists))))
 831           (setq search-path (cdr search-path))))
 832       ;; Compress out duplicates while building complete list (slloooow!)
 833       (let ((sorted (sort (apply 'nconc file-lists)
 834                           '(lambda (x y) (not (string-lessp x y)))))
 835             compressed)
 836         (while sorted
 837           (if (equal (car sorted) (car compressed)) nil
 838             (setq compressed (cons (car sorted) compressed)))
 839           (setq sorted (cdr sorted)))
 840         compressed))))
 841
 842 (defvar PC-old-read-file-name-internal nil)
 843
 844 (defun PC-read-include-file-name-internal (string dir action)
 845   (if (string-match "<\\([^\"<>]*\\)>?$" string)
 846       (let* ((name (substring string (match-beginning 1) (match-end 1)))
 847              (str2 (substring string (match-beginning 0)))
 848              (completion-table
 849               (mapcar (function (lambda (x) (list (format "<%s>" x))))
 850                       (PC-include-file-all-completions
 851                        name (PC-include-file-path)))))
 852         (cond
 853          ((not completion-table) nil)
 854          ((eq action nil) (try-completion str2 completion-table nil))
 855          ((eq action t) (all-completions str2 completion-table nil))
 856          ((eq action 'lambda)
 857           (eq (try-completion str2 completion-table nil) t))))
 858     (funcall PC-old-read-file-name-internal string dir action)))
 859
 860 (or PC-disable-includes
 861     (memq 'PC-look-for-include-file find-file-not-found-hooks)
 862     (setq find-file-not-found-hooks (cons 'PC-look-for-include-file
 863                                           find-file-not-found-hooks)))
 864
 865 (or PC-disable-includes
 866     PC-old-read-file-name-internal
 867     (progn
 868       (setq PC-old-read-file-name-internal
 869             (symbol-function 'read-file-name-internal))
 870       (fset 'read-file-name-internal 'PC-read-include-file-name-internal)))
 871
 872 \f
 873 (provide 'complete)
 874
 875 ;;; End.