lisp/complete.el

   1 ;;; complete.el --- partial completion mechanism plus other goodies
   2
   3 ;; Copyright (C) 1990, 1991, 1992, 1993, 1999, 2000, 2001, 2002, 2003,
   4 ;;   2004, 2005, 2006 Free Software Foundation, Inc.
   5
   6 ;; Author: Dave Gillespie <daveg@synaptics.com>
   7 ;; Keywords: abbrev convenience
   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., 51 Franklin Street, Fifth Floor,
  25 ;; Boston, MA 02110-1301, 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:  M-x partial-completion-mode.  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 ;;       (partial-completion-mode t)
  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 ;; In addition, this package includes a feature for accessing include
  82 ;; files.  For example, `C-x C-f <sys/time.h> RET' reads the file
  83 ;; /usr/include/sys/time.h.  The variable PC-include-file-path is a
  84 ;; list of directories in which to search for include files.  Completion
  85 ;; is supported in include file names.
  86
  87
  88 ;;; Code:
  89
  90 (defgroup partial-completion nil
  91   "Partial Completion of items."
  92   :prefix "pc-"
  93   :group 'minibuffer
  94   :group 'convenience)
  95
  96 (defcustom PC-first-char 'find-file
  97   "Control how the first character of a string is to be interpreted.
  98 If nil, the first character of a string is not taken literally if it is a word
  99 delimiter, so that \".e\" matches \"*.e*\".
 100 If t, the first character of a string is always taken literally even if it is a
 101 word delimiter, so that \".e\" matches \".e*\".
 102 If non-nil and non-t, the first character is taken literally only for file name
 103 completion."
 104   :type '(choice (const :tag "delimiter" nil)
 105                  (const :tag "literal" t)
 106                  (other :tag "find-file" find-file))
 107   :group 'partial-completion)
 108
 109 (defcustom PC-meta-flag t
 110   "If non-nil, TAB means PC completion and M-TAB means normal completion.
 111 Otherwise, TAB means normal completion and M-TAB means Partial Completion."
 112   :type 'boolean
 113   :group 'partial-completion)
 114
 115 (defcustom PC-word-delimiters "-_. "
 116   "A string of characters treated as word delimiters for completion.
 117 Some arcane rules:
 118 If `]' is in this string, it must come first.
 119 If `^' is in this string, it must not come first.
 120 If `-' is in this string, it must come first or right after `]'.
 121 In other words, if S is this string, then `[S]' must be a valid Emacs regular
 122 expression (not containing character ranges like `a-z')."
 123   :type 'string
 124   :group 'partial-completion)
 125
 126 (defcustom PC-include-file-path '("/usr/include" "/usr/local/include")
 127   "A list of directories in which to look for include files.
 128 If nil, means use the colon-separated path in the variable $INCPATH instead."
 129   :type '(repeat directory)
 130   :group 'partial-completion)
 131
 132 (defcustom PC-disable-includes nil
 133   "If non-nil, include-file support in \\[find-file] is disabled."
 134   :type 'boolean
 135   :group 'partial-completion)
 136
 137 (defvar PC-default-bindings t
 138   "If non-nil, default partial completion key bindings are suppressed.")
 139
 140 (defvar PC-env-vars-alist nil
 141   "A list of the environment variable names and values.")
 142
 143 \f
 144 (defun PC-bindings (bind)
 145   (let ((completion-map minibuffer-local-completion-map)
 146         (must-match-map minibuffer-local-must-match-map))
 147     (cond ((not bind)
 148            ;; These bindings are the default bindings.  It would be better to
 149            ;; restore the previous bindings.
 150            (define-key completion-map "\t"      'minibuffer-complete)
 151            (define-key completion-map " "       'minibuffer-complete-word)
 152            (define-key completion-map "?"       'minibuffer-completion-help)
 153
 154            (define-key must-match-map "\t"      'minibuffer-complete)
 155            (define-key must-match-map " "       'minibuffer-complete-word)
 156            (define-key must-match-map "\r"      'minibuffer-complete-and-exit)
 157            (define-key must-match-map "\n"      'minibuffer-complete-and-exit)
 158            (define-key must-match-map "?"       'minibuffer-completion-help)
 159
 160            (define-key global-map "\e\t"        'complete-symbol))
 161           (PC-default-bindings
 162            (define-key completion-map "\t"      'PC-complete)
 163            (define-key completion-map " "       'PC-complete-word)
 164            (define-key completion-map "?"       'PC-completion-help)
 165
 166            (define-key completion-map "\e\t"    'PC-complete)
 167            (define-key completion-map "\e "     'PC-complete-word)
 168            (define-key completion-map "\e\r"    'PC-force-complete-and-exit)
 169            (define-key completion-map "\e\n"    'PC-force-complete-and-exit)
 170            (define-key completion-map "\e?"     'PC-completion-help)
 171
 172            (define-key must-match-map "\t"      'PC-complete)
 173            (define-key must-match-map " "       'PC-complete-word)
 174            (define-key must-match-map "\r"      'PC-complete-and-exit)
 175            (define-key must-match-map "\n"      'PC-complete-and-exit)
 176            (define-key must-match-map "?"       'PC-completion-help)
 177
 178            (define-key must-match-map "\e\t"    'PC-complete)
 179            (define-key must-match-map "\e "     'PC-complete-word)
 180            (define-key must-match-map "\e\r"    'PC-complete-and-exit)
 181            (define-key must-match-map "\e\n"    'PC-complete-and-exit)
 182            (define-key must-match-map "\e?"     'PC-completion-help)
 183
 184            (define-key global-map "\e\t"        'PC-lisp-complete-symbol)))))
 185
 186 ;;;###autoload
 187 (define-minor-mode partial-completion-mode
 188   "Toggle Partial Completion mode.
 189 With prefix ARG, turn Partial Completion mode on if ARG is positive.
 190
 191 When Partial Completion mode is enabled, TAB (or M-TAB if `PC-meta-flag' is
 192 nil) is enhanced so that if some string is divided into words and each word is
 193 delimited by a character in `PC-word-delimiters', partial words are completed
 194 as much as possible and `*' characters are treated likewise in file names.
 195
 196 For example, M-x p-c-m expands to M-x partial-completion-mode since no other
 197 command begins with that sequence of characters, and
 198 \\[find-file] f_b.c TAB might complete to foo_bar.c if that file existed and no
 199 other file in that directory begins with that sequence of characters.
 200
 201 Unless `PC-disable-includes' is non-nil, the `<...>' sequence is interpreted
 202 specially in \\[find-file].  For example,
 203 \\[find-file] <sys/time.h> RET finds the file `/usr/include/sys/time.h'.
 204 See also the variable `PC-include-file-path'.
 205
 206 Partial Completion mode extends the meaning of `completion-auto-help' (which
 207 see), so that if it is neither nil nor t, Emacs shows the `*Completions*'
 208 buffer only on the second attempt to complete.  That is, if TAB finds nothing
 209 to complete, the first TAB just says \"Next char not unique\" and the
 210 second TAB brings up the `*Completions*' buffer."
 211   :global t :group 'partial-completion
 212   ;; Deal with key bindings...
 213   (PC-bindings partial-completion-mode)
 214   ;; Deal with include file feature...
 215   (cond ((not partial-completion-mode)
 216          (remove-hook 'find-file-not-found-functions 'PC-look-for-include-file))
 217         ((not PC-disable-includes)
 218          (add-hook 'find-file-not-found-functions 'PC-look-for-include-file)))
 219   ;; ... with some underhand redefining.
 220   (cond ((not partial-completion-mode)
 221          (ad-disable-advice 'read-file-name-internal 'around 'PC-include-file)
 222          (ad-activate 'read-file-name-internal))
 223         ((not PC-disable-includes)
 224          (ad-enable-advice 'read-file-name-internal 'around 'PC-include-file)
 225          (ad-activate 'read-file-name-internal)))
 226   ;; Adjust the completion selection in *Completion* buffers to the way
 227   ;; we work.  The default minibuffer completion code only completes the
 228   ;; text before point and leaves the text after point alone (new in
 229   ;; Emacs-22).  In contrast we use the whole text and we even sometimes
 230   ;; move point to a place before EOB, to indicate the first position where
 231   ;; there's a difference, so when the user uses choose-completion, we have
 232   ;; to trick choose-completion into replacing the whole minibuffer text
 233   ;; rather than only the text before point.  --Stef
 234   (funcall
 235    (if partial-completion-mode 'add-hook 'remove-hook)
 236    'choose-completion-string-functions
 237    (lambda (choice buffer mini-p base-size)
 238      (if mini-p (goto-char (point-max)))
 239      nil))
 240   ;; Build the env-completion and mapping table.
 241   (when (and partial-completion-mode (null PC-env-vars-alist))
 242     (setq PC-env-vars-alist
 243           (mapcar (lambda (string)
 244                     (let ((d (string-match "=" string)))
 245                       (cons (concat "$" (substring string 0 d))
 246                             (and d (substring string (1+ d))))))
 247                   process-environment))))
 248
 249 \f
 250 (defun PC-complete ()
 251   "Like minibuffer-complete, but allows \"b--di\"-style abbreviations.
 252 For example, \"M-x b--di\" would match `byte-recompile-directory', or any
 253 name which consists of three or more words, the first beginning with \"b\"
 254 and the third beginning with \"di\".
 255
 256 The pattern \"b--d\" is ambiguous for `byte-recompile-directory' and
 257 `beginning-of-defun', so this would produce a list of completions
 258 just like when normal Emacs completions are ambiguous.
 259
 260 Word-delimiters for the purposes of Partial Completion are \"-\", \"_\",
 261 \".\", and SPC."
 262   (interactive)
 263   (if (PC-was-meta-key)
 264       (minibuffer-complete)
 265     ;; If the previous command was not this one,
 266     ;; never scroll, always retry completion.
 267     (or (eq last-command this-command)
 268         (setq minibuffer-scroll-window nil))
 269     (let ((window minibuffer-scroll-window))
 270       ;; If there's a fresh completion window with a live buffer,
 271       ;; and this command is repeated, scroll that window.
 272       (if (and window (window-buffer window)
 273                (buffer-name (window-buffer window)))
 274           (with-current-buffer (window-buffer window)
 275             (if (pos-visible-in-window-p (point-max) window)
 276                 (set-window-start window (point-min) nil)
 277               (scroll-other-window)))
 278         (PC-do-completion nil)))))
 279
 280
 281 (defun PC-complete-word ()
 282   "Like `minibuffer-complete-word', but allows \"b--di\"-style abbreviations.
 283 See `PC-complete' for details.
 284 This can be bound to other keys, like `-' and `.', if you wish."
 285   (interactive)
 286   (if (eq (PC-was-meta-key) PC-meta-flag)
 287       (if (eq last-command-char ? )
 288           (minibuffer-complete-word)
 289         (self-insert-command 1))
 290     (self-insert-command 1)
 291     (if (eobp)
 292         (PC-do-completion 'word))))
 293
 294
 295 (defun PC-complete-space ()
 296   "Like `minibuffer-complete-word', but allows \"b--di\"-style abbreviations.
 297 See `PC-complete' for details.
 298 This is suitable for binding to other keys which should act just like SPC."
 299   (interactive)
 300   (if (eq (PC-was-meta-key) PC-meta-flag)
 301       (minibuffer-complete-word)
 302     (insert " ")
 303     (if (eobp)
 304         (PC-do-completion 'word))))
 305
 306
 307 (defun PC-complete-and-exit ()
 308   "Like `minibuffer-complete-and-exit', but allows \"b--di\"-style abbreviations.
 309 See `PC-complete' for details."
 310   (interactive)
 311   (if (eq (PC-was-meta-key) PC-meta-flag)
 312       (minibuffer-complete-and-exit)
 313     (PC-do-complete-and-exit)))
 314
 315 (defun PC-force-complete-and-exit ()
 316   "Like `minibuffer-complete-and-exit', but allows \"b--di\"-style abbreviations.
 317 See `PC-complete' for details."
 318   (interactive)
 319   (let ((minibuffer-completion-confirm nil))
 320     (PC-do-complete-and-exit)))
 321
 322 (defun PC-do-complete-and-exit ()
 323   (if (= (point-max) (minibuffer-prompt-end))  ; Duplicate the "bug" that Info-menu relies on...
 324       (exit-minibuffer)
 325     (let ((flag (PC-do-completion 'exit)))
 326       (and flag
 327            (if (or (eq flag 'complete)
 328                    (not minibuffer-completion-confirm))
 329                (exit-minibuffer)
 330              (PC-temp-minibuffer-message " [Confirm]"))))))
 331
 332
 333 (defun PC-completion-help ()
 334   "Like `minibuffer-completion-help', but allows \"b--di\"-style abbreviations.
 335 See `PC-complete' for details."
 336   (interactive)
 337   (if (eq (PC-was-meta-key) PC-meta-flag)
 338       (minibuffer-completion-help)
 339     (PC-do-completion 'help)))
 340
 341 (defun PC-was-meta-key ()
 342   (or (/= (length (this-command-keys)) 1)
 343       (let ((key (aref (this-command-keys) 0)))
 344         (if (integerp key)
 345             (>= key 128)
 346           (not (null (memq 'meta (event-modifiers key))))))))
 347
 348
 349 (defvar PC-ignored-extensions 'empty-cache)
 350 (defvar PC-delims 'empty-cache)
 351 (defvar PC-ignored-regexp nil)
 352 (defvar PC-word-failed-flag nil)
 353 (defvar PC-delim-regex nil)
 354 (defvar PC-ndelims-regex nil)
 355 (defvar PC-delims-list nil)
 356
 357 (defvar PC-completion-as-file-name-predicate
 358   (lambda () minibuffer-completing-file-name)
 359   "A function testing whether a minibuffer completion now will work filename-style.
 360 The function takes no arguments, and typically looks at the value
 361 of `minibuffer-completion-table' and the minibuffer contents.")
 362
 363 ;; Returns the sequence of non-delimiter characters that follow regexp in string.
 364 (defun PC-chunk-after (string regexp)
 365   (if (not (string-match regexp string))
 366       (let ((message (format "String %s didn't match regexp %s" string regexp)))
 367         (message message)
 368         (error message)))
 369   (let ((result (substring string (match-end 0))))
 370     ;; result may contain multiple chunks
 371     (if (string-match PC-delim-regex result)
 372         (setq result (substring result 0 (match-beginning 0))))
 373     result))
 374
 375 (defun test-completion-ignore-case (str table pred)
 376   "Like `test-completion', but ignores case when possible."
 377   ;; Binding completion-ignore-case to nil ensures, for compatibility with
 378   ;; standard completion, that the return value is exactly one of the
 379   ;; possibilities.  Do this binding only if pred is nil, out of paranoia;
 380   ;; perhaps it is safe even if pred is non-nil.
 381   (if pred
 382       (test-completion str table pred)
 383     (let ((completion-ignore-case nil))
 384       (test-completion str table pred))))
 385
 386 (defun PC-do-completion (&optional mode beg end)
 387   (or beg (setq beg (minibuffer-prompt-end)))
 388   (or end (setq end (point-max)))
 389   (let* ((table minibuffer-completion-table)
 390          (pred minibuffer-completion-predicate)
 391          (filename (funcall PC-completion-as-file-name-predicate))
 392          (dirname nil)          ; non-nil only if a filename is being completed
 393          (dirlength 0)
 394          (str (buffer-substring beg end))
 395          (incname (and filename (string-match "<\\([^\"<>]*\\)>?$" str)))
 396          (ambig nil)
 397          basestr origstr
 398          env-on
 399          regex
 400          p offset
 401          (poss nil)
 402          helpposs
 403          (case-fold-search completion-ignore-case))
 404
 405     ;; Check if buffer contents can already be considered complete
 406     (if (and (eq mode 'exit)
 407              (test-completion-ignore-case str table pred))
 408         'complete
 409
 410       ;; Do substitutions in directory names
 411       (and filename
 412            (setq basestr (or (file-name-directory str) ""))
 413            (setq dirlength (length basestr))
 414            ;; Do substitutions in directory names
 415            (setq p (substitute-in-file-name basestr))
 416            (not (string-equal basestr p))
 417            (setq str (concat p (file-name-nondirectory str)))
 418            (progn
 419              (delete-region beg end)
 420              (insert str)
 421              (setq end (+ beg (length str)))))
 422
 423       ;; Prepare various delimiter strings
 424       (or (equal PC-word-delimiters PC-delims)
 425           (setq PC-delims PC-word-delimiters
 426                 PC-delim-regex (concat "[" PC-delims "]")
 427                 PC-ndelims-regex (concat "[^" PC-delims "]*")
 428                 PC-delims-list (append PC-delims nil)))
 429
 430       ;; Add wildcards if necessary
 431       (and filename
 432            (let ((dir (file-name-directory str))
 433                  (file (file-name-nondirectory str))
 434                  ;; The base dir for file-completion is passed in `predicate'.
 435                  (default-directory (expand-file-name pred)))
 436              (while (and (stringp dir) (not (file-directory-p dir)))
 437                (setq dir (directory-file-name dir))
 438                (setq file (concat (replace-regexp-in-string
 439                                    PC-delim-regex "*\\&"
 440                                    (file-name-nondirectory dir))
 441                                   "*/" file))
 442                (setq dir (file-name-directory dir)))
 443              (setq origstr str str (concat dir file))))
 444
 445       ;; Look for wildcard expansions in directory name
 446       (and filename
 447            (string-match "\\*.*/" str)
 448            (let ((pat str)
 449                  ;; The base dir for file-completion is passed in `predicate'.
 450                  (default-directory (expand-file-name pred))
 451                  files)
 452              (setq p (1+ (string-match "/[^/]*\\'" pat)))
 453              (while (setq p (string-match PC-delim-regex pat p))
 454                (setq pat (concat (substring pat 0 p)
 455                                  "*"
 456                                  (substring pat p))
 457                      p (+ p 2)))
 458              (setq files (PC-expand-many-files (concat pat "*")))
 459              (if files
 460                  (let ((dir (file-name-directory (car files)))
 461                        (p files))
 462                    (while (and (setq p (cdr p))
 463                                (equal dir (file-name-directory (car p)))))
 464                    (if p
 465                        (setq filename nil table nil pred nil
 466                              ambig t)
 467                      (delete-region beg end)
 468                      (setq str (concat dir (file-name-nondirectory str)))
 469                      (insert str)
 470                      (setq end (+ beg (length str)))))
 471                (if origstr
 472                    ;; If the wildcards were introduced by us, it's possible
 473                    ;; that read-file-name-internal (especially our
 474                    ;; PC-include-file advice) can still find matches for the
 475                    ;; original string even if we couldn't, so remove the
 476                    ;; added wildcards.
 477                    (setq str origstr)
 478                  (setq filename nil table nil pred nil)))))
 479
 480       ;; Strip directory name if appropriate
 481       (if filename
 482           (if incname
 483               (setq basestr (substring str incname)
 484                     dirname (substring str 0 incname))
 485             (setq basestr (file-name-nondirectory str)
 486                   dirname (file-name-directory str))
 487             ;; Make sure str is consistent with its directory and basename
 488             ;; parts.  This is important on DOZe'NT systems when str only
 489             ;; includes a drive letter, like in "d:".
 490             (setq str (concat dirname basestr)))
 491         (setq basestr str))
 492
 493       ;; Convert search pattern to a standard regular expression
 494       (setq regex (regexp-quote basestr)
 495             offset (if (and (> (length regex) 0)
 496                             (not (eq (aref basestr 0) ?\*))
 497                             (or (eq PC-first-char t)
 498                                 (and PC-first-char filename))) 1 0)
 499             p offset)
 500       (while (setq p (string-match PC-delim-regex regex p))
 501         (if (eq (aref regex p) ? )
 502             (setq regex (concat (substring regex 0 p)
 503                                 PC-ndelims-regex
 504                                 PC-delim-regex
 505                                 (substring regex (1+ p)))
 506                   p (+ p (length PC-ndelims-regex) (length PC-delim-regex)))
 507           (let ((bump (if (memq (aref regex p)
 508                                 '(?$ ?^ ?\. ?* ?+ ?? ?[ ?] ?\\))
 509                           -1 0)))
 510             (setq regex (concat (substring regex 0 (+ p bump))
 511                                 PC-ndelims-regex
 512                                 (substring regex (+ p bump)))
 513                   p (+ p (length PC-ndelims-regex) 1)))))
 514       (setq p 0)
 515       (if filename
 516           (while (setq p (string-match "\\\\\\*" regex p))
 517             (setq regex (concat (substring regex 0 p)
 518                                 "[^/]*"
 519                                 (substring regex (+ p 2))))))
 520       ;;(setq the-regex regex)
 521       (setq regex (concat "\\`" regex))
 522
 523       (and (> (length basestr) 0)
 524            (= (aref basestr 0) ?$)
 525            (setq env-on t
 526                  table PC-env-vars-alist
 527                  pred nil))
 528
 529       ;; Find an initial list of possible completions
 530       (if (not (setq p (string-match (concat PC-delim-regex
 531                                              (if filename "\\|\\*" ""))
 532                                      str
 533                                      (+ (length dirname) offset))))
 534
 535           ;; Minibuffer contains no hyphens -- simple case!
 536           (setq poss (all-completions (if env-on
 537                                           basestr str)
 538                                       table
 539                                       pred))
 540
 541         ;; Use all-completions to do an initial cull.  This is a big win,
 542         ;; since all-completions is written in C!
 543         (let ((compl (all-completions (if env-on
 544                                           (file-name-nondirectory (substring str 0 p))
 545                                         (substring str 0 p))
 546                                       table
 547                                       pred)))
 548           (setq p compl)
 549           (while p
 550             (and (string-match regex (car p))
 551                  (progn
 552                    (set-text-properties 0 (length (car p)) '() (car p))
 553                    (setq poss (cons (car p) poss))))
 554             (setq p (cdr p)))))
 555
 556       ;; Handle completion-ignored-extensions
 557       (and filename
 558            (not (eq mode 'help))
 559            (let ((p2 poss))
 560
 561              ;; Build a regular expression representing the extensions list
 562              (or (equal completion-ignored-extensions PC-ignored-extensions)
 563                  (setq PC-ignored-regexp
 564                        (concat "\\("
 565                                (mapconcat
 566                                 'regexp-quote
 567                                 (setq PC-ignored-extensions
 568                                       completion-ignored-extensions)
 569                                 "\\|")
 570                                "\\)\\'")))
 571
 572              ;; Check if there are any without an ignored extension.
 573              ;; Also ignore `.' and `..'.
 574              (setq p nil)
 575              (while p2
 576                (or (string-match PC-ignored-regexp (car p2))
 577                    (string-match "\\(\\`\\|/\\)[.][.]?/?\\'" (car p2))
 578                    (setq p (cons (car p2) p)))
 579                (setq p2 (cdr p2)))
 580
 581              ;; If there are "good" names, use them
 582              (and p (setq poss p))))
 583
 584       ;; Now we have a list of possible completions
 585       (cond
 586
 587        ;; No valid completions found
 588        ((null poss)
 589         (if (and (eq mode 'word)
 590                  (not PC-word-failed-flag))
 591             (let ((PC-word-failed-flag t))
 592               (delete-backward-char 1)
 593               (PC-do-completion 'word))
 594           (beep)
 595           (PC-temp-minibuffer-message (if ambig
 596                                           " [Ambiguous dir name]"
 597                                         (if (eq mode 'help)
 598                                             " [No completions]"
 599                                           " [No match]")))
 600           nil))
 601
 602        ;; More than one valid completion found
 603        ((or (cdr (setq helpposs poss))
 604             (memq mode '(help word)))
 605
 606         ;; Is the actual string one of the possible completions?
 607         (setq p (and (not (eq mode 'help)) poss))
 608         (while (and p
 609                     (not (string-equal (car p) basestr)))
 610           (setq p (cdr p)))
 611         (and p (null mode)
 612              (PC-temp-minibuffer-message " [Complete, but not unique]"))
 613         (if (and p
 614                  (not (and (null mode)
 615                            (eq this-command last-command))))
 616             t
 617
 618           ;; If ambiguous, try for a partial completion
 619           (let ((improved nil)
 620                 prefix
 621                 (pt nil)
 622                 (skip "\\`"))
 623
 624             ;; Check if next few letters are the same in all cases
 625             (if (and (not (eq mode 'help))
 626                      (setq prefix (try-completion (PC-chunk-after basestr skip)
 627                                                   poss)))
 628                 (let ((first t) i)
 629                   ;; Retain capitalization of user input even if
 630                   ;; completion-ignore-case is set.
 631                   (if (eq mode 'word)
 632                       (setq prefix (PC-chop-word prefix basestr)))
 633                   (goto-char (+ beg (length dirname)))
 634                   (while (and (progn
 635                                 (setq i 0) ; index into prefix string
 636                                 (while (< i (length prefix))
 637                                   (if (and (< (point) end)
 638                                            (eq (downcase (aref prefix i))
 639                                                (downcase (following-char))))
 640                                       ;; same char (modulo case); no action
 641                                       (forward-char 1)
 642                                     (if (and (< (point) end)
 643                                              (and (looking-at " ")
 644                                                       (memq (aref prefix i)
 645                                                         PC-delims-list)))
 646                                         ;; replace " " by the actual delimiter
 647                                         (progn
 648                                           (delete-char 1)
 649                                           (insert (substring prefix i (1+ i))))
 650                                       ;; insert a new character
 651                                       (progn
 652                                       (and filename (looking-at "\\*")
 653                                            (progn
 654                                              (delete-char 1)
 655                                              (setq end (1- end))))
 656                                         (setq improved t)
 657                                     (insert (substring prefix i (1+ i)))
 658                                         (setq end (1+ end)))))
 659                                   (setq i (1+ i)))
 660                                 (or pt (setq pt (point)))
 661                                 (looking-at PC-delim-regex))
 662                               (setq skip (concat skip
 663                                                  (regexp-quote prefix)
 664                                                  PC-ndelims-regex)
 665                                     prefix (try-completion
 666                                             (PC-chunk-after
 667                                              ;; not basestr, because that does
 668                                              ;; not reflect insertions
 669                                              (buffer-substring
 670                                               (+ beg (length dirname)) end)
 671                                              skip)
 672                                             (mapcar
 673                                              (lambda (x)
 674                                                (when (string-match skip x)
 675                                                  (substring x (match-end 0))))
 676                                              poss)))
 677                               (or (> i 0) (> (length prefix) 0))
 678                               (or (not (eq mode 'word))
 679                                   (and first (> (length prefix) 0)
 680                                        (setq first nil
 681                                              prefix (substring prefix 0 1))))))
 682                   (goto-char (if (eq mode 'word) end
 683                                (or pt beg)))))
 684
 685             (if (and (eq mode 'word)
 686                      (not PC-word-failed-flag))
 687
 688                 (if improved
 689
 690                     ;; We changed it... would it be complete without the space?
 691                     (if (test-completion (buffer-substring 1 (1- end))
 692                                           table pred)
 693                         (delete-region (1- end) end)))
 694
 695               (if improved
 696
 697                   ;; We changed it... enough to be complete?
 698                   (and (eq mode 'exit)
 699                        (test-completion-ignore-case (field-string) table pred))
 700
 701                 ;; If totally ambiguous, display a list of completions
 702                 (if (or (eq completion-auto-help t)
 703                         (and completion-auto-help
 704                              (eq last-command this-command))
 705                         (eq mode 'help))
 706                     (with-output-to-temp-buffer "*Completions*"
 707                       (display-completion-list (sort helpposs 'string-lessp))
 708                       (with-current-buffer standard-output
 709                         ;; Record which part of the buffer we are completing
 710                         ;; so that choosing a completion from the list
 711                         ;; knows how much old text to replace.
 712                         (setq completion-base-size dirlength)))
 713                   (PC-temp-minibuffer-message " [Next char not unique]"))
 714                 nil)))))
 715
 716        ;; Only one possible completion
 717        (t
 718         (if (and (equal basestr (car poss))
 719                  (not (and env-on filename)))
 720             (if (null mode)
 721                 (PC-temp-minibuffer-message " [Sole completion]"))
 722           (delete-region beg end)
 723           (insert (format "%s"
 724                           (if filename
 725                               (substitute-in-file-name (concat dirname (car poss)))
 726                             (car poss)))))
 727         t)))))
 728
 729 (defun PC-chop-word (new old)
 730   (let ((i -1)
 731         (j -1))
 732     (while (and (setq i (string-match PC-delim-regex old (1+ i)))
 733                 (setq j (string-match PC-delim-regex new (1+ j)))))
 734     (if (and j
 735              (or (not PC-word-failed-flag)
 736                  (setq j (string-match PC-delim-regex new (1+ j)))))
 737         (substring new 0 (1+ j))
 738       new)))
 739
 740 (defvar PC-not-minibuffer nil)
 741
 742 (defun PC-temp-minibuffer-message (message)
 743   "A Lisp version of `temp_minibuffer_message' from minibuf.c."
 744   (cond (PC-not-minibuffer
 745          (message message)
 746          (sit-for 2)
 747          (message ""))
 748         ((fboundp 'temp-minibuffer-message)
 749          (temp-minibuffer-message message))
 750         (t
 751          (let ((point-max (point-max)))
 752            (save-excursion
 753              (goto-char point-max)
 754              (insert message))
 755            (let ((inhibit-quit t))
 756              (sit-for 2)
 757              (delete-region point-max (point-max))
 758              (when quit-flag
 759                (setq quit-flag nil
 760                      unread-command-events '(7))))))))
 761
 762
 763 (defun PC-lisp-complete-symbol ()
 764   "Perform completion on Lisp symbol preceding point.
 765 That symbol is compared against the symbols that exist
 766 and any additional characters determined by what is there
 767 are inserted.
 768 If the symbol starts just after an open-parenthesis,
 769 only symbols with function definitions are considered.
 770 Otherwise, all symbols with function definitions, values
 771 or properties are considered."
 772   (interactive)
 773   (let* ((end (point))
 774          (beg (save-excursion
 775                 (with-syntax-table lisp-mode-syntax-table
 776                   (backward-sexp 1)
 777                   (while (= (char-syntax (following-char)) ?\')
 778                     (forward-char 1))
 779                   (point))))
 780          (minibuffer-completion-table obarray)
 781          (minibuffer-completion-predicate
 782           (if (eq (char-after (1- beg)) ?\()
 783               'fboundp
 784             (function (lambda (sym)
 785                         (or (boundp sym) (fboundp sym)
 786                             (symbol-plist sym))))))
 787          (PC-not-minibuffer t))
 788     (PC-do-completion nil beg end)))
 789
 790 (defun PC-complete-as-file-name ()
 791    "Perform completion on file names preceding point.
 792  Environment vars are converted to their values."
 793    (interactive)
 794    (let* ((end (point))
 795           (beg (if (re-search-backward "[^\\][ \t\n\"\`\'][^ \t\n\"\`\']"
 796                                        (point-min) t)
 797                    (+ (point) 2)
 798                    (point-min)))
 799           (minibuffer-completion-table 'read-file-name-internal)
 800           (minibuffer-completion-predicate "")
 801           (PC-not-minibuffer t))
 802      (goto-char end)
 803      (PC-do-completion nil beg end)))
 804
 805 ;; Use the shell to do globbing.
 806 ;; This could now use file-expand-wildcards instead.
 807
 808 (defun PC-expand-many-files (name)
 809   (with-current-buffer (generate-new-buffer " *Glob Output*")
 810     (erase-buffer)
 811     (when (and (file-name-absolute-p name)
 812                (not (file-directory-p default-directory)))
 813       ;; If the current working directory doesn't exist `shell-command'
 814       ;; signals an error.  So if the file names we're looking for don't
 815       ;; depend on the working directory, switch to a valid directory first.
 816       (setq default-directory "/"))
 817     (shell-command (concat "echo " name) t)
 818     (goto-char (point-min))
 819     ;; CSH-style shells were known to output "No match", whereas
 820     ;; SH-style shells tend to simply output `name' when no match is found.
 821     (if (looking-at (concat ".*No match\\|\\(^\\| \\)\\("
 822                             (regexp-quote name)
 823                             "\\|"
 824                             (regexp-quote (expand-file-name name))
 825                             "\\)\\( \\|$\\)"))
 826         nil
 827       (insert "(\"")
 828       (while (search-forward " " nil t)
 829         (delete-backward-char 1)
 830         (insert "\" \""))
 831       (goto-char (point-max))
 832       (delete-backward-char 1)
 833       (insert "\")")
 834       (goto-char (point-min))
 835       (let ((files (read (current-buffer))) (p nil))
 836         (kill-buffer (current-buffer))
 837         (or (equal completion-ignored-extensions PC-ignored-extensions)
 838             (setq PC-ignored-regexp
 839                   (concat "\\("
 840                           (mapconcat
 841                            'regexp-quote
 842                            (setq PC-ignored-extensions
 843                                  completion-ignored-extensions)
 844                            "\\|")
 845                           "\\)\\'")))
 846         (setq p nil)
 847         (while files
 848           ;; This whole process of going through to shell, to echo, and
 849           ;; finally parsing the output is a hack.  It breaks as soon as
 850           ;; there are spaces in the file names or when the no-match
 851           ;; message changes.  To make up for it, we check that what we read
 852           ;; indeed exists, so we may miss some files, but we at least won't
 853           ;; list non-existent ones.
 854           (or (not (file-exists-p (car files)))
 855               (string-match PC-ignored-regexp (car files))
 856               (setq p (cons (car files) p)))
 857           (setq files (cdr files)))
 858         p))))
 859
 860 ;; Facilities for loading C header files.  This is independent from the
 861 ;; main completion code.  See also the variable `PC-include-file-path'
 862 ;; at top of this file.
 863
 864 (defun PC-look-for-include-file ()
 865   (if (string-match "[\"<]\\([^\"<>]*\\)[\">]?$" (buffer-file-name))
 866       (let ((name (substring (buffer-file-name)
 867                              (match-beginning 1) (match-end 1)))
 868             (punc (aref (buffer-file-name) (match-beginning 0)))
 869             (path nil)
 870             new-buf)
 871         (kill-buffer (current-buffer))
 872         (if (equal name "")
 873             (with-current-buffer (car (buffer-list))
 874               (save-excursion
 875                 (beginning-of-line)
 876                 (if (looking-at
 877                      "[ \t]*#[ \t]*include[ \t]+[<\"]\\(.+\\)[>\"][ \t]*[\n/]")
 878                     (setq name (buffer-substring (match-beginning 1)
 879                                                  (match-end 1))
 880                           punc (char-after (1- (match-beginning 1))))
 881                   ;; Suggested by Frank Siebenlist:
 882                   (if (or (looking-at
 883                            "[ \t]*([ \t]*load[ \t]+\"\\([^\"]+\\)\"")
 884                           (looking-at
 885                            "[ \t]*([ \t]*load-library[ \t]+\"\\([^\"]+\\)\"")
 886                           (looking-at
 887                            "[ \t]*([ \t]*require[ \t]+'\\([^\t )]+\\)[\t )]"))
 888                       (progn
 889                         (setq name (buffer-substring (match-beginning 1)
 890                                                      (match-end 1))
 891                               punc ?\<
 892                               path load-path)
 893                         (if (string-match "\\.elc$" name)
 894                             (setq name (substring name 0 -1))
 895                           (or (string-match "\\.el$" name)
 896                               (setq name (concat name ".el")))))
 897                     (error "Not on an #include line"))))))
 898         (or (string-match "\\.[[:alnum:]]+$" name)
 899             (setq name (concat name ".h")))
 900         (if (eq punc ?\<)
 901             (let ((path (or path (PC-include-file-path))))
 902               (while (and path
 903                           (not (file-exists-p
 904                                 (concat (file-name-as-directory (car path))
 905                                         name))))
 906                 (setq path (cdr path)))
 907               (if path
 908                   (setq name (concat (file-name-as-directory (car path)) name))
 909                 (error "No such include file: <%s>" name)))
 910           (let ((dir (with-current-buffer (car (buffer-list))
 911                        default-directory)))
 912             (if (file-exists-p (concat dir name))
 913                 (setq name (concat dir name))
 914               (error "No such include file: `%s'" name))))
 915         (setq new-buf (get-file-buffer name))
 916         (if new-buf
 917             ;; no need to verify last-modified time for this!
 918             (set-buffer new-buf)
 919           (set-buffer (create-file-buffer name))
 920           (erase-buffer)
 921           (insert-file-contents name t))
 922         ;; Returning non-nil with the new buffer current
 923         ;; is sufficient to tell find-file to use it.
 924         t)
 925     nil))
 926
 927 (defun PC-include-file-path ()
 928   (or PC-include-file-path
 929       (let ((env (getenv "INCPATH"))
 930             (path nil)
 931             pos)
 932         (or env (error "No include file path specified"))
 933         (while (setq pos (string-match ":[^:]+$" env))
 934           (setq path (cons (substring env (1+ pos)) path)
 935                 env (substring env 0 pos)))
 936         path)))
 937
 938 ;; This is adapted from lib-complete.el, by Mike Williams.
 939 (defun PC-include-file-all-completions (file search-path &optional full)
 940   "Return all completions for FILE in any directory on SEARCH-PATH.
 941 If optional third argument FULL is non-nil, returned pathnames should be
 942 absolute rather than relative to some directory on the SEARCH-PATH."
 943   (setq search-path
 944         (mapcar (lambda (dir)
 945                   (if dir (file-name-as-directory dir) default-directory))
 946                 search-path))
 947   (if (file-name-absolute-p file)
 948       ;; It's an absolute file name, so don't need search-path
 949       (progn
 950         (setq file (expand-file-name file))
 951         (file-name-all-completions
 952          (file-name-nondirectory file) (file-name-directory file)))
 953     (let ((subdir (file-name-directory file))
 954           (ndfile (file-name-nondirectory file))
 955           file-lists)
 956       ;; Append subdirectory part to each element of search-path
 957       (if subdir
 958           (setq search-path
 959                 (mapcar (lambda (dir) (concat dir subdir))
 960                         search-path)
 961                 file ))
 962       ;; Make list of completions in each directory on search-path
 963       (while search-path
 964         (let* ((dir (car search-path))
 965                (subdir (if full dir subdir)))
 966           (if (file-directory-p dir)
 967               (progn
 968                 (setq file-lists
 969                       (cons
 970                        (mapcar (lambda (file) (concat subdir file))
 971                                (file-name-all-completions ndfile
 972                                                           (car search-path)))
 973                        file-lists))))
 974           (setq search-path (cdr search-path))))
 975       ;; Compress out duplicates while building complete list (slloooow!)
 976       (let ((sorted (sort (apply 'nconc file-lists)
 977                           (lambda (x y) (not (string-lessp x y)))))
 978             compressed)
 979         (while sorted
 980           (if (equal (car sorted) (car compressed)) nil
 981             (setq compressed (cons (car sorted) compressed)))
 982           (setq sorted (cdr sorted)))
 983         compressed))))
 984
 985 (defadvice read-file-name-internal (around PC-include-file disable)
 986   (if (string-match "<\\([^\"<>]*\\)>?\\'" (ad-get-arg 0))
 987       (let* ((string (ad-get-arg 0))
 988              (action (ad-get-arg 2))
 989              (name (substring string (match-beginning 1) (match-end 1)))
 990              (str2 (substring string (match-beginning 0)))
 991              (completion-table
 992               (mapcar (lambda (x) (format "<%s>" x))
 993                       (PC-include-file-all-completions
 994                        name (PC-include-file-path)))))
 995         (setq ad-return-value
 996               (cond
 997                ((not completion-table) nil)
 998                ((eq action 'lambda) (test-completion str2 completion-table nil))
 999                ((eq action nil) (try-completion str2 completion-table nil))
1000                ((eq action t) (all-completions str2 completion-table nil)))))
1001     ad-do-it))
1002 \f
1003
1004 (provide 'complete)
1005
1006 ;; arch-tag: fc7e2768-ff44-4e22-b579-4d825b968458
1007 ;;; complete.el ends here