code.delx.au - gnu-emacs/blob - 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     ;; If the previous command was not this one,
 182     ;; never scroll, always retry completion.
 183     (or (eq last-command this-command)
 184         (setq minibuffer-scroll-window nil))
 185     (let ((window minibuffer-scroll-window))
 186       ;; If there's a fresh completion window with a live buffer,
 187       ;; and this command is repeated, scroll that window.
 188       (if (and window (window-buffer window)
 189                (buffer-name (window-buffer window)))
 190           (save-excursion
 191             (set-buffer (window-buffer window))
 192             (if (pos-visible-in-window-p (point-max) window)
 193                 (set-window-start window (point-min) nil)
 194               (scroll-other-window)))
 195         (PC-do-completion nil)))))
 196
 197
 198 (defun PC-complete-word ()
 199   "Like `minibuffer-complete-word', but allows \"b--di\"-style abbreviations.
 200 See `PC-complete' for details.
 201 This can be bound to other keys, like `-' and `.', if you wish."
 202   (interactive)
 203   (if (eq (PC-was-meta-key) PC-meta-flag)
 204       (if (eq last-command-char ? )
 205           (minibuffer-complete-word)
 206         (self-insert-command 1))
 207     (self-insert-command 1)
 208     (if (eobp)
 209         (PC-do-completion 'word))))
 210
 211
 212 (defun PC-complete-space ()
 213   "Like `minibuffer-complete-word', but allows \"b--di\"-style abbreviations.
 214 See `PC-complete' for details.
 215 This is suitable for binding to other keys which should act just like SPC."
 216   (interactive)
 217   (if (eq (PC-was-meta-key) PC-meta-flag)
 218       (minibuffer-complete-word)
 219     (insert " ")
 220     (if (eobp)
 221         (PC-do-completion 'word))))
 222
 223
 224 (defun PC-complete-and-exit ()
 225   "Like `minibuffer-complete-and-exit', but allows \"b--di\"-style abbreviations.
 226 See `PC-complete' for details."
 227   (interactive)
 228   (if (eq (PC-was-meta-key) PC-meta-flag)
 229       (minibuffer-complete-and-exit)
 230     (PC-do-complete-and-exit)))
 231
 232 (defun PC-force-complete-and-exit ()
 233   "Like `minibuffer-complete-and-exit', but allows \"b--di\"-style abbreviations.
 234 See `PC-complete' for details."
 235   (interactive)
 236   (let ((minibuffer-completion-confirm nil))
 237     (PC-do-complete-and-exit)))
 238
 239 (defun PC-do-complete-and-exit ()
 240   (if (= (buffer-size) 0)  ; Duplicate the "bug" that Info-menu relies on...
 241       (exit-minibuffer)
 242     (let ((flag (PC-do-completion 'exit)))
 243       (and flag
 244            (if (or (eq flag 'complete)
 245                    (not minibuffer-completion-confirm))
 246                (exit-minibuffer)
 247              (PC-temp-minibuffer-message " [Confirm]"))))))
 248
 249
 250 (defun PC-completion-help ()
 251   "Like `minibuffer-completion-help', but allows \"b--di\"-style abbreviations.
 252 See `PC-complete' for details."
 253   (interactive)
 254   (if (eq (PC-was-meta-key) PC-meta-flag)
 255       (minibuffer-completion-help)
 256     (PC-do-completion 'help)))
 257
 258 (defun PC-was-meta-key ()
 259   (or (/= (length (this-command-keys)) 1)
 260       (let ((key (aref (this-command-keys) 0)))
 261         (if (integerp key)
 262             (>= key 128)
 263           (not (null (memq 'meta (event-modifiers key))))))))
 264
 265
 266 (defvar PC-ignored-extensions 'empty-cache)
 267 (defvar PC-delims 'empty-cache)
 268 (defvar PC-ignored-regexp nil)
 269 (defvar PC-word-failed-flag nil)
 270 (defvar PC-delim-regex nil)
 271 (defvar PC-ndelims-regex nil)
 272 (defvar PC-delims-list nil)
 273
 274 (defvar PC-completion-as-file-name-predicate
 275   (function
 276    (lambda ()
 277      (memq minibuffer-completion-table
 278            '(read-file-name-internal read-directory-name-internal))))
 279    "A function testing whether a minibuffer completion now will work filename-style.
 280 The function takes no arguments, and typically looks at the value
 281 of `minibuffer-completion-table' and the minibuffer contents.")
 282
 283 (defun PC-do-completion (&optional mode beg end)
 284   (or beg (setq beg (point-min)))
 285   (or end (setq end (point-max)))
 286   (let* ((table minibuffer-completion-table)
 287          (pred minibuffer-completion-predicate)
 288          (filename (funcall PC-completion-as-file-name-predicate))
 289          (dirname nil)
 290          dirlength
 291          (str (buffer-substring beg end))
 292          (incname (and filename (string-match "<\\([^\"<>]*\\)>?$" str)))
 293          (ambig nil)
 294          basestr
 295          regex
 296          p offset
 297          (poss nil)
 298          helpposs
 299          (case-fold-search completion-ignore-case))
 300
 301     ;; Check if buffer contents can already be considered complete
 302     (if (and (eq mode 'exit)
 303              (PC-is-complete-p str table pred))
 304         'complete
 305
 306       ;; Record how many characters at the beginning are not included
 307       ;; in completion.
 308       (setq dirlength
 309             (if filename
 310                 (length (file-name-directory str))
 311               0))
 312
 313       ;; Do substitutions in directory names
 314       (and filename
 315            (not (equal str (setq p (substitute-in-file-name str))))
 316            (progn
 317              (delete-region beg end)
 318              (insert p)
 319              (setq str p end (+ beg (length str)))))
 320
 321       ;; Prepare various delimiter strings
 322       (or (equal PC-word-delimiters PC-delims)
 323           (setq PC-delims PC-word-delimiters
 324                 PC-delim-regex (concat "[" PC-delims "]")
 325                 PC-ndelims-regex (concat "[^" PC-delims "]*")
 326                 PC-delims-list (append PC-delims nil)))
 327
 328       ;; Look for wildcard expansions in directory name
 329       (and filename
 330            (string-match "\\*.*/" str)
 331            (let ((pat str)
 332                  files)
 333              (setq p (1+ (string-match "/[^/]*\\'" pat)))
 334              (while (setq p (string-match PC-delim-regex pat p))
 335                (setq pat (concat (substring pat 0 p)
 336                                  "*"
 337                                  (substring pat p))
 338                      p (+ p 2)))
 339              (setq files (PC-expand-many-files (concat pat "*")))
 340              (if files
 341                  (let ((dir (file-name-directory (car files)))
 342                        (p files))
 343                    (while (and (setq p (cdr p))
 344                                (equal dir (file-name-directory (car p)))))
 345                    (if p
 346                        (setq filename nil table nil pred nil
 347                              ambig t)
 348                      (delete-region beg end)
 349                      (setq str (concat dir (file-name-nondirectory str)))
 350                      (insert str)
 351                      (setq end (+ beg (length str)))))
 352                (setq filename nil table nil pred nil))))
 353
 354       ;; Strip directory name if appropriate
 355       (if filename
 356           (if incname
 357               (setq basestr (substring str incname)
 358                     dirname (substring str 0 incname))
 359             (setq basestr (file-name-nondirectory str)
 360                   dirname (file-name-directory str)))
 361         (setq basestr str))
 362
 363       ;; Convert search pattern to a standard regular expression
 364       (setq regex (regexp-quote basestr)
 365             offset (if (and (> (length regex) 0)
 366                             (not (eq (aref basestr 0) ?\*))
 367                             (or (eq PC-first-char t)
 368                                 (and PC-first-char filename))) 1 0)
 369             p offset)
 370       (while (setq p (string-match PC-delim-regex regex p))
 371         (if (eq (aref regex p) ? )
 372             (setq regex (concat (substring regex 0 p)
 373                                 PC-ndelims-regex
 374                                 PC-delim-regex
 375                                 (substring regex (1+ p)))
 376                   p (+ p (length PC-ndelims-regex) (length PC-delim-regex)))
 377           (let ((bump (if (memq (aref regex p)
 378                                 '(?$ ?^ ?\. ?* ?+ ?? ?[ ?] ?\\))
 379                           -1 0)))
 380             (setq regex (concat (substring regex 0 (+ p bump))
 381                                 PC-ndelims-regex
 382                                 (substring regex (+ p bump)))
 383                   p (+ p (length PC-ndelims-regex) 1)))))
 384       (setq p 0)
 385       (if filename
 386           (while (setq p (string-match "\\\\\\*" regex p))
 387             (setq regex (concat (substring regex 0 p)
 388                                 "[^/]*"
 389                                 (substring regex (+ p 2))))))
 390       ;;(setq the-regex regex)
 391       (setq regex (concat "\\`" regex))
 392
 393       ;; Find an initial list of possible completions
 394       (if (not (setq p (string-match (concat PC-delim-regex
 395                                              (if filename "\\|\\*" ""))
 396                                      str
 397                                      (+ (length dirname) offset))))
 398
 399           ;; Minibuffer contains no hyphens -- simple case!
 400           (setq poss (all-completions str
 401                                       table
 402                                       pred))
 403
 404         ;; Use all-completions to do an initial cull.  This is a big win,
 405         ;; since all-completions is written in C!
 406         (let ((compl (all-completions (substring str 0 p)
 407                                       table
 408                                       pred)))
 409           (setq p compl)
 410           (while p
 411             (and (string-match regex (car p))
 412                  (setq poss (cons (car p) poss)))
 413             (setq p (cdr p)))))
 414
 415       ;; Now we have a list of possible completions
 416       (cond
 417
 418        ;; No valid completions found
 419        ((null poss)
 420         (if (and (eq mode 'word)
 421                  (not PC-word-failed-flag))
 422             (let ((PC-word-failed-flag t))
 423               (delete-backward-char 1)
 424               (PC-do-completion 'word))
 425           (beep)
 426           (PC-temp-minibuffer-message (if ambig
 427                                           " [Ambiguous dir name]"
 428                                         (if (eq mode 'help)
 429                                             " [No completions]"
 430                                           " [No match]")))
 431           nil))
 432
 433        ;; More than one valid completion found
 434        ((or (cdr (setq helpposs poss))
 435             (memq mode '(help word)))
 436
 437         ;; Handle completion-ignored-extensions
 438         (and filename
 439              (not (eq mode 'help))
 440              (let ((p2 poss))
 441
 442                ;; Build a regular expression representing the extensions list
 443                (or (equal completion-ignored-extensions PC-ignored-extensions)
 444                    (setq PC-ignored-regexp
 445                          (concat "\\("
 446                                  (mapconcat
 447                                   'regexp-quote
 448                                   (setq PC-ignored-extensions
 449                                         completion-ignored-extensions)
 450                                   "\\|")
 451                                  "\\)\\'")))
 452
 453                ;; Check if there are any without an ignored extension
 454                (setq p nil)
 455                (while p2
 456                  (or (string-match PC-ignored-regexp (car p2))
 457                      (setq p (cons (car p2) p)))
 458                  (setq p2 (cdr p2)))
 459
 460                ;; If there are "good" names, use them
 461                (and p (setq poss p))))
 462
 463         ;; Is the actual string one of the possible completions?
 464         (setq p (and (not (eq mode 'help)) poss))
 465         (while (and p
 466                     (not (equal (car p) basestr)))
 467           (setq p (cdr p)))
 468         (and p (null mode)
 469              (PC-temp-minibuffer-message " [Complete, but not unique]"))
 470         (if (and p
 471                  (not (and (null mode)
 472                            (eq this-command last-command))))
 473             t
 474
 475           ;; If ambiguous, try for a partial completion
 476           (let ((improved nil)
 477                 prefix
 478                 (pt nil)
 479                 (skip "\\`"))
 480
 481             ;; Check if next few letters are the same in all cases
 482             (if (and (not (eq mode 'help))
 483                      (setq prefix (try-completion "" (mapcar 'list poss))))
 484                 (let ((first t) i)
 485                   (if (eq mode 'word)
 486                       (setq prefix (PC-chop-word prefix basestr)))
 487                   (goto-char (+ beg (length dirname)))
 488                   (while (and (progn
 489                                 (setq i 0)
 490                                 (while (< i (length prefix))
 491                                   (if (and (< (point) end)
 492                                            (eq (aref prefix i)
 493                                                (following-char)))
 494                                       (forward-char 1)
 495                                     (if (and (< (point) end)
 496                                              (or (and (looking-at " ")
 497                                                       (memq (aref prefix i)
 498                                                             PC-delims-list))
 499                                                  (eq (downcase (aref prefix i))
 500                                                      (downcase
 501                                                       (following-char)))))
 502                                         (progn
 503                                           (delete-char 1)
 504                                           (setq end (1- end)))
 505                                       (and filename (looking-at "\\*")
 506                                            (progn
 507                                              (delete-char 1)
 508                                              (setq end (1- end))))
 509                                       (setq improved t))
 510                                     ;; Use format to discard text properties.
 511                                     (insert (format "%s" (substring prefix i (1+ i))))
 512                                     (setq end (1+ end)))
 513                                   (setq i (1+ i)))
 514                                 (or pt (equal (point) beg)
 515                                     (setq pt (point)))
 516                                 (looking-at PC-delim-regex))
 517                               (setq skip (concat skip
 518                                                  (regexp-quote prefix)
 519                                                  PC-ndelims-regex)
 520                                     prefix (try-completion
 521                                             ""
 522                                             (mapcar
 523                                              (function
 524                                               (lambda (x)
 525                                                 (list
 526                                                  (and (string-match skip x)
 527                                                       (substring
 528                                                        x
 529                                                        (match-end 0))))))
 530                                              poss)))
 531                               (or (> i 0) (> (length prefix) 0))
 532                               (or (not (eq mode 'word))
 533                                   (and first (> (length prefix) 0)
 534                                        (setq first nil
 535                                              prefix (substring prefix 0 1))))))
 536                   (goto-char (if (eq mode 'word) end
 537                                (or pt beg)))))
 538
 539             (if (and (eq mode 'word)
 540                      (not PC-word-failed-flag))
 541
 542                 (if improved
 543
 544                     ;; We changed it... would it be complete without the space?
 545                     (if (PC-is-complete-p (buffer-substring 1 (1- end))
 546                                           table pred)
 547                         (delete-region (1- end) end)))
 548
 549               (if improved
 550
 551                   ;; We changed it... enough to be complete?
 552                   (and (eq mode 'exit)
 553                        (PC-is-complete-p (buffer-string) table pred))
 554
 555                 ;; If totally ambiguous, display a list of completions
 556                 (if (or completion-auto-help
 557                         (eq mode 'help))
 558                     (with-output-to-temp-buffer "*Completions*"
 559                       (display-completion-list (sort helpposs 'string-lessp))
 560                       (save-excursion
 561                         (set-buffer standard-output)
 562                         ;; Record which part of the buffer we are completing
 563                         ;; so that choosing a completion from the list
 564                         ;; knows how much old text to replace.
 565                         (setq completion-base-size dirlength)))
 566                   (PC-temp-minibuffer-message " [Next char not unique]"))
 567                 nil)))))
 568
 569        ;; Only one possible completion
 570        (t
 571         (if (equal basestr (car poss))
 572             (if (null mode)
 573                 (PC-temp-minibuffer-message " [Sole completion]"))
 574           (delete-region beg end)
 575           (insert (format "%s"
 576                           (if filename
 577                               (substitute-in-file-name (concat dirname (car poss)))
 578                             (car poss)))))
 579         t)))))
 580
 581
 582 (defun PC-is-complete-p (str table pred)
 583   (let ((res (if (listp table)
 584                  (assoc str table)
 585                (if (vectorp table)
 586                    (or (equal str "nil")   ; heh, heh, heh
 587                        (intern-soft str table))
 588                  (funcall table str pred 'lambda)))))
 589     (and res
 590          (or (not pred)
 591              (and (not (listp table)) (not (vectorp table)))
 592              (funcall pred res))
 593          res)))
 594
 595 (defun PC-chop-word (new old)
 596   (let ((i -1)
 597         (j -1))
 598     (while (and (setq i (string-match PC-delim-regex old (1+ i)))
 599                 (setq j (string-match PC-delim-regex new (1+ j)))))
 600     (if (and j
 601              (or (not PC-word-failed-flag)
 602                  (setq j (string-match PC-delim-regex new (1+ j)))))
 603         (substring new 0 (1+ j))
 604       new)))
 605
 606 (defvar PC-not-minibuffer nil)
 607
 608 (defun PC-temp-minibuffer-message (m)
 609   "A Lisp version of `temp_minibuffer_message' from minibuf.c."
 610   (if PC-not-minibuffer
 611       (progn
 612         (message m)
 613         (sit-for 2)
 614         (message ""))
 615     (if (fboundp 'temp-minibuffer-message)
 616         (temp-minibuffer-message m)
 617       (let ((savemax (point-max)))
 618         (save-excursion
 619           (goto-char (point-max))
 620           (insert m))
 621         (let ((inhibit-quit t))
 622           (sit-for 2)
 623           (delete-region savemax (point-max))
 624           (if quit-flag
 625               (setq quit-flag nil
 626                     unread-command-char 7)))))))
 627
 628
 629 (defun PC-lisp-complete-symbol ()
 630   "Perform completion on Lisp symbol preceding point.
 631 That symbol is compared against the symbols that exist
 632 and any additional characters determined by what is there
 633 are inserted.
 634 If the symbol starts just after an open-parenthesis,
 635 only symbols with function definitions are considered.
 636 Otherwise, all symbols with function definitions, values
 637 or properties are considered."
 638   (interactive)
 639   (let* ((end (point))
 640          (buffer-syntax (syntax-table))
 641          (beg (unwind-protect
 642                   (save-excursion
 643                     (if lisp-mode-syntax-table
 644                         (set-syntax-table lisp-mode-syntax-table))
 645                     (backward-sexp 1)
 646                     (while (= (char-syntax (following-char)) ?\')
 647                       (forward-char 1))
 648                     (point))
 649                 (set-syntax-table buffer-syntax)))
 650          (minibuffer-completion-table obarray)
 651          (minibuffer-completion-predicate
 652           (if (eq (char-after (1- beg)) ?\()
 653               'fboundp
 654             (function (lambda (sym)
 655                         (or (boundp sym) (fboundp sym)
 656                             (symbol-plist sym))))))
 657          (PC-not-minibuffer t))
 658     (PC-do-completion nil beg end)))
 659
 660
 661 ;;; Wildcards in `C-x C-f' command.  This is independent from the main
 662 ;;; completion code, except for `PC-expand-many-files' which is called
 663 ;;; when "*"'s are found in the path during filename completion.  (The
 664 ;;; above completion code always understands "*"'s, except in file paths,
 665 ;;; without relying on the following code.)
 666
 667 (defvar PC-many-files-list nil)
 668
 669 (defun PC-try-load-many-files ()
 670   (if (string-match "\\*" buffer-file-name)
 671       (let* ((pat buffer-file-name)
 672              (files (PC-expand-many-files pat))
 673              (first (car files))
 674              (next files))
 675         (kill-buffer (current-buffer))
 676         (or files
 677             (error "No matching files"))
 678         (save-window-excursion
 679           (while (setq next (cdr next))
 680             (let ((buf (find-file-noselect (car next))))
 681               (switch-to-buffer buf))))
 682         ;; This modifies the "buf" variable inside find-file-noselect.
 683         (setq buf (get-file-buffer first))
 684         (if buf
 685             nil   ; should do verify-visited-file-modtime stuff.
 686           (setq filename first)
 687           (setq buf (create-file-buffer filename))
 688           (set-buffer buf)
 689           (erase-buffer)
 690           (insert-file-contents filename t))
 691         (if (cdr files)
 692             (setq PC-many-files-list (mapconcat
 693                                       (if (string-match "\\*.*/" pat)
 694                                           'identity
 695                                         'file-name-nondirectory)
 696                                       (cdr files) ", ")
 697                   find-file-hooks (cons 'PC-after-load-many-files
 698                                         find-file-hooks)))
 699         ;; This modifies the "error" variable inside find-file-noselect.
 700         (setq error nil)
 701         t)
 702     nil))
 703
 704 (defun PC-after-load-many-files ()
 705   (setq find-file-hooks (delq 'PC-after-load-many-files find-file-hooks))
 706   (message "Also loaded %s." PC-many-files-list))
 707
 708 (defun PC-expand-many-files (name)
 709   (save-excursion
 710     (set-buffer (generate-new-buffer " *Glob Output*"))
 711     (erase-buffer)
 712     (shell-command (concat "echo " name) t)
 713     (goto-char (point-min))
 714     (if (looking-at ".*No match")
 715         nil
 716       (insert "(\"")
 717       (while (search-forward " " nil t)
 718         (delete-backward-char 1)
 719         (insert "\" \""))
 720       (goto-char (point-max))
 721       (delete-backward-char 1)
 722       (insert "\")")
 723       (goto-char (point-min))
 724       (let ((files (read (current-buffer))))
 725         (kill-buffer (current-buffer))
 726         files))))
 727
 728 (or PC-disable-wildcards
 729     (memq 'PC-try-load-many-files find-file-not-found-hooks)
 730     (setq find-file-not-found-hooks (cons 'PC-try-load-many-files
 731                                           find-file-not-found-hooks)))
 732
 733
 734
 735 ;;; Facilities for loading C header files.  This is independent from the
 736 ;;; main completion code.  See also the variable `PC-include-file-path'
 737 ;;; at top of this file.
 738
 739 (defun PC-look-for-include-file ()
 740   (if (string-match "[\"<]\\([^\"<>]*\\)[\">]?$" (buffer-file-name))
 741       (let ((name (substring (buffer-file-name)
 742                              (match-beginning 1) (match-end 1)))
 743             (punc (aref (buffer-file-name) (match-beginning 0)))
 744             (path nil)
 745             new-buf)
 746         (kill-buffer (current-buffer))
 747         (if (equal name "")
 748             (save-excursion
 749               (set-buffer (car (buffer-list)))
 750               (save-excursion
 751                 (beginning-of-line)
 752                 (if (looking-at
 753                      "[ \t]*#[ \t]*include[ \t]+[<\"]\\(.+\\)[>\"][ \t]*[\n/]")
 754                     (setq name (buffer-substring (match-beginning 1)
 755                                                  (match-end 1))
 756                           punc (char-after (1- (match-beginning 1))))
 757                   ;; Suggested by Frank Siebenlist:
 758                   (if (or (looking-at
 759                            "[ \t]*([ \t]*load[ \t]+\"\\([^\"]+\\)\"")
 760                           (looking-at
 761                            "[ \t]*([ \t]*load-library[ \t]+\"\\([^\"]+\\)\"")
 762                           (looking-at
 763                            "[ \t]*([ \t]*require[ \t]+'\\([^\t )]+\\)[\t )]"))
 764                       (progn
 765                         (setq name (buffer-substring (match-beginning 1)
 766                                                      (match-end 1))
 767                               punc ?\<
 768                               path load-path)
 769                         (if (string-match "\\.elc$" name)
 770                             (setq name (substring name 0 -1))
 771                           (or (string-match "\\.el$" name)
 772                               (setq name (concat name ".el")))))
 773                     (error "Not on an #include line"))))))
 774         (or (string-match "\\.[a-zA-Z0-9]+$" name)
 775             (setq name (concat name ".h")))
 776         (if (eq punc ?\<)
 777             (let ((path (or path (PC-include-file-path))))
 778               (while (and path
 779                           (not (file-exists-p
 780                                 (concat (file-name-as-directory (car path))
 781                                         name))))
 782                 (setq path (cdr path)))
 783               (if path
 784                   (setq name (concat (file-name-as-directory (car path)) name))
 785                 (error "No such include file: <%s>" name)))
 786           (let ((dir (save-excursion
 787                        (set-buffer (car (buffer-list)))
 788                        default-directory)))
 789             (if (file-exists-p (concat dir name))
 790                 (setq name (concat dir name))
 791               (error "No such include file: \"%s\"" name))))
 792         (setq new-buf (get-file-buffer name))
 793         (if new-buf
 794             ;; no need to verify last-modified time for this!
 795             (set-buffer new-buf)
 796           (setq new-buf (create-file-buffer name))
 797           (set-buffer new-buf)
 798           (erase-buffer)
 799           (insert-file-contents name t))
 800         (setq filename name
 801               error nil
 802               buf new-buf)
 803         t)
 804     nil))
 805
 806 (defun PC-include-file-path ()
 807   (or PC-include-file-path
 808       (let ((env (getenv "INCPATH"))
 809             (path nil)
 810             pos)
 811         (or env (error "No include file path specified"))
 812         (while (setq pos (string-match ":[^:]+$" env))
 813           (setq path (cons (substring env (1+ pos)) path)
 814                 env (substring env 0 pos)))
 815         path)))
 816
 817 ;;; This is adapted from lib-complete.el, by Mike Williams.
 818 (defun PC-include-file-all-completions (file search-path &optional full)
 819   "Return all completions for FILE in any directory on SEARCH-PATH.
 820 If optional third argument FULL is non-nil, returned pathnames should be
 821 absolute rather than relative to some directory on the SEARCH-PATH."
 822   (setq search-path
 823         (mapcar '(lambda (dir)
 824                    (if dir (file-name-as-directory dir) default-directory))
 825                 search-path))
 826   (if (file-name-absolute-p file)
 827       ;; It's an absolute file name, so don't need search-path
 828       (progn
 829         (setq file (expand-file-name file))
 830         (file-name-all-completions
 831          (file-name-nondirectory file) (file-name-directory file)))
 832     (let ((subdir (file-name-directory file))
 833           (ndfile (file-name-nondirectory file))
 834           file-lists)
 835       ;; Append subdirectory part to each element of search-path
 836       (if subdir
 837           (setq search-path
 838                 (mapcar '(lambda (dir) (concat dir subdir))
 839                         search-path)
 840                 file ))
 841       ;; Make list of completions in each directory on search-path
 842       (while search-path
 843         (let* ((dir (car search-path))
 844                (subdir (if full dir subdir)))
 845           (if (file-directory-p dir)
 846               (progn
 847                 (setq file-lists
 848                       (cons
 849                        (mapcar '(lambda (file) (concat subdir file))
 850                                (file-name-all-completions ndfile
 851                                                           (car search-path)))
 852                        file-lists))))
 853           (setq search-path (cdr search-path))))
 854       ;; Compress out duplicates while building complete list (slloooow!)
 855       (let ((sorted (sort (apply 'nconc file-lists)
 856                           '(lambda (x y) (not (string-lessp x y)))))
 857             compressed)
 858         (while sorted
 859           (if (equal (car sorted) (car compressed)) nil
 860             (setq compressed (cons (car sorted) compressed)))
 861           (setq sorted (cdr sorted)))
 862         compressed))))
 863
 864 (defvar PC-old-read-file-name-internal nil)
 865
 866 (defun PC-read-include-file-name-internal (string dir action)
 867   (if (string-match "<\\([^\"<>]*\\)>?$" string)
 868       (let* ((name (substring string (match-beginning 1) (match-end 1)))
 869              (str2 (substring string (match-beginning 0)))
 870              (completion-table
 871               (mapcar (function (lambda (x) (list (format "<%s>" x))))
 872                       (PC-include-file-all-completions
 873                        name (PC-include-file-path)))))
 874         (cond
 875          ((not completion-table) nil)
 876          ((eq action nil) (try-completion str2 completion-table nil))
 877          ((eq action t) (all-completions str2 completion-table nil))
 878          ((eq action 'lambda)
 879           (eq (try-completion str2 completion-table nil) t))))
 880     (funcall PC-old-read-file-name-internal string dir action)))
 881
 882 (or PC-disable-includes
 883     (memq 'PC-look-for-include-file find-file-not-found-hooks)
 884     (setq find-file-not-found-hooks (cons 'PC-look-for-include-file
 885                                           find-file-not-found-hooks)))
 886
 887 (or PC-disable-includes
 888     PC-old-read-file-name-internal
 889     (progn
 890       (setq PC-old-read-file-name-internal
 891             (symbol-function 'read-file-name-internal))
 892       (fset 'read-file-name-internal 'PC-read-include-file-name-internal)))
 893
 894 \f
 895 (provide 'complete)
 896
 897 ;;; End.