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lisp/complete.el

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+;; complete.el -- partial completion mechanism plus other goodies.
+
+;; Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
+
+;; Author: Dave Gillespie <daveg@synaptics.com>
+;; Version: 2.02
+;; Special thanks to Hallvard Furuseth for his many ideas and contributions.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY.  No author or distributor
+;; accepts responsibility to anyone for the consequences of using it
+;; or for whether it serves any particular purpose or works at all,
+;; unless he says so in writing.  Refer to the GNU Emacs General Public
+;; License for full details.
+
+;; Everyone is granted permission to copy, modify and redistribute
+;; GNU Emacs, but only under the conditions described in the
+;; GNU Emacs General Public License.   A copy of this license is
+;; supposed to have been given to you along with GNU Emacs so you
+;; can know your rights and responsibilities.  It should be in a
+;; file named COPYING.  Among other things, the copyright notice
+;; and this notice must be preserved on all copies.
+
+
+;; Commentary:
+
+;; Extended completion for the Emacs minibuffer.
+;;
+;; The basic idea is that the command name or other completable text is
+;; divided into words and each word is completed separately, so that
+;; "M-x p-b" expands to "M-x print-buffer".  If the entry is ambiguous
+;; each word is completed as much as possible and then the cursor is
+;; left at the first position where typing another letter will resolve
+;; the ambiguity.
+;;
+;; Word separators for this purpose are hyphen, space, and period.
+;; These would most likely occur in command names, Info menu items,
+;; and file names, respectively.  But all word separators are treated
+;; alike at all times.
+;;
+;; This completion package replaces the old-style completer's key
+;; bindings for TAB, SPC, RET, and `?'.  The old completer is still
+;; available on the Meta versions of those keys.  If you set
+;; PC-meta-flag to nil, the old completion keys will be left alone
+;; and the partial completer will use the Meta versions of the keys.
+
+
+;; Usage:  Load this file.  Now, during completable minibuffer entry,
+;;
+;;     TAB    means to do a partial completion;
+;;     SPC    means to do a partial complete-word;
+;;     RET    means to do a partial complete-and-exit;
+;;     ?      means to do a partial completion-help.
+;;
+;; If you set PC-meta-flag to nil, then TAB, SPC, RET, and ? perform
+;; original Emacs completions, and M-TAB etc. do partial completion.
+;; To do this, put the command,
+;;
+;;       (setq PC-meta-flag nil)
+;;
+;; in your .emacs file.  To load partial completion automatically, put
+;;
+;;       (load "complete")
+;;
+;; in your .emacs file, too.  Things will be faster if you byte-compile
+;; this file when you install it.
+;;
+;; As an extra feature, in cases where RET would not normally
+;; complete (such as `C-x b'), the M-RET key will always do a partial
+;; complete-and-exit.  Thus `C-x b f.c RET' will select or create a
+;; buffer called "f.c", but `C-x b f.c M-RET' will select the existing
+;; buffer whose name matches that pattern (perhaps "filing.c").
+;; (PC-meta-flag does not affect this behavior; M-RET used to be
+;; undefined in this situation.)
+;;
+;; The regular M-TAB (lisp-complete-symbol) command also supports
+;; partial completion in this package.
+
+;; This package also contains a wildcard feature for C-x C-f (find-file).
+;; For example, `C-x C-f *.c RET' loads all .c files at once, exactly
+;; as if you had typed C-x C-f separately for each file.  Completion
+;; is supported in connection with wildcards.  Currently only the `*'
+;; wildcard character works.
+
+;; File name completion does not do partial completion of directories
+;; on the path, e.g., "/u/b/f" will not complete to "/usr/bin/foo",
+;; but you can put *'s in the path to accomplish this:  "/u*/b*/f".
+;; Stars are required for performance reasons.
+
+;; In addition, this package includes a feature for accessing include
+;; files.  For example, `C-x C-f <sys/time.h> RET' reads the file
+;; /usr/include/sys/time.h.  The variable PC-include-file-path is a
+;; list of directories in which to search for include files.  Completion
+;; is supported in include file names.
+
+
+;; Code:
+
+(defvar PC-meta-flag t
+  "*If nil, TAB does normal Emacs completion and M-TAB does Partial Completion.
+If t, TAB does Partial Completion and M-TAB does normal completion.")
+
+
+(defvar PC-word-delimiters "-_. "
+  "*A string of characters which are to be treated as word delimiters
+by the Partial Completion system.
+
+Some arcane rules:  If `]' is in this string it must come first.
+If `^' is in this string it must NOT come first.  If `-' is in this
+string, it must come first or right after `]'.  In other words, if
+S is this string, then `[S]' must be a legal Emacs regular expression
+(not containing character ranges like `a-z').")
+
+
+(defvar PC-first-char 'x
+  "*If t, first character of a string to be completed is always taken literally.
+If nil, word delimiters are handled even if they appear as first character.
+This controls whether \".e\" matches \".e*\" (t) or \"*.e*\" (nil).
+If neither nil nor t, first char is literal only for filename completion.")
+
+
+(defvar PC-include-file-path '("/usr/include")
+  "*List of directories in which to look for include files.
+If this is nil, uses the colon-separated path in $INCPATH instead.")
+
+
+(defvar PC-disable-wildcards nil
+  "Set this to non-nil to disable wildcard support in \\[find-file].")
+
+(defvar PC-disable-includes nil
+  "Set this to non-nil to disable include-file support in \\[find-file].")
+
+
+(defvar PC-default-bindings t
+  "Set this to nil to suppress the default partial completion key bindings.")
+
+(if PC-default-bindings (progn
+(define-key minibuffer-local-completion-map "\t" 'PC-complete)
+(define-key minibuffer-local-completion-map " "  'PC-complete-word)
+(define-key minibuffer-local-completion-map "?"  'PC-completion-help)
+
+(define-key minibuffer-local-completion-map "\e\t" 'PC-complete)
+(define-key minibuffer-local-completion-map "\e "  'PC-complete-word)
+(define-key minibuffer-local-completion-map "\e\r" 'PC-force-complete-and-exit)
+(define-key minibuffer-local-completion-map "\e\n" 'PC-force-complete-and-exit)
+(define-key minibuffer-local-completion-map "\e?"  'PC-completion-help)
+
+(define-key minibuffer-local-must-match-map "\t" 'PC-complete)
+(define-key minibuffer-local-must-match-map " "  'PC-complete-word)
+(define-key minibuffer-local-must-match-map "\r" 'PC-complete-and-exit)
+(define-key minibuffer-local-must-match-map "\n" 'PC-complete-and-exit)
+(define-key minibuffer-local-must-match-map "?"  'PC-completion-help)
+
+(define-key minibuffer-local-must-match-map "\e\t" 'PC-complete)
+(define-key minibuffer-local-must-match-map "\e "  'PC-complete-word)
+(define-key minibuffer-local-must-match-map "\e\r" 'PC-complete-and-exit)
+(define-key minibuffer-local-must-match-map "\e\n" 'PC-complete-and-exit)
+(define-key minibuffer-local-must-match-map "\e?"  'PC-completion-help)
+
+(define-key global-map "\e\t" 'PC-lisp-complete-symbol)
+))
+
+
+(defun PC-complete ()
+  "Like minibuffer-complete, but allows \"b--di\"-style abbreviations.
+For example, \"M-x b--di\" would match `byte-recompile-directory', or any
+name which consists of three or more words, the first beginning with \"b\"
+and the third beginning with \"di\".
+
+The pattern \"b--d\" is ambiguous for `byte-recompile-directory' and
+`beginning-of-defun', so this would produce a list of completions
+just like when normal Emacs completions are ambiguous.
+
+Word-delimiters for the purposes of Partial Completion are \"-\", \"_\",
+\".\", and SPC."
+  (interactive)
+  (if (PC-was-meta-key)
+      (minibuffer-complete)
+    (PC-do-completion nil)))
+
+
+(defun PC-complete-word ()
+  "Like `minibuffer-complete-word', but allows \"b--di\"-style abbreviations.
+See `PC-complete' for details.
+This can be bound to other keys, like `-' and `.', if you wish."
+  (interactive)
+  (if (eq (PC-was-meta-key) PC-meta-flag)
+      (if (eq last-command-char ? )
+	  (minibuffer-complete-word)
+	(self-insert-command 1))
+    (self-insert-command 1)
+    (if (eobp)
+	(PC-do-completion 'word))))
+
+
+(defun PC-complete-space ()
+  "Like `minibuffer-complete-word', but allows \"b--di\"-style abbreviations.
+See `PC-complete' for details.
+This is suitable for binding to other keys which should act just like SPC."
+  (interactive)
+  (if (eq (PC-was-meta-key) PC-meta-flag)
+      (minibuffer-complete-word)
+    (insert " ")
+    (if (eobp)
+	(PC-do-completion 'word))))
+
+
+(defun PC-complete-and-exit ()
+  "Like `minibuffer-complete-and-exit', but allows \"b--di\"-style abbreviations.
+See `PC-complete' for details."
+  (interactive)
+  (if (eq (PC-was-meta-key) PC-meta-flag)
+      (minibuffer-complete-and-exit)
+    (PC-do-complete-and-exit)))
+
+(defun PC-force-complete-and-exit ()
+  "Like `minibuffer-complete-and-exit', but allows \"b--di\"-style abbreviations.
+See `PC-complete' for details."
+  (interactive)
+  (let ((minibuffer-completion-confirm nil))
+    (PC-do-complete-and-exit)))
+
+(defun PC-do-complete-and-exit ()
+  (if (= (buffer-size) 0)  ; Duplicate the "bug" that Info-menu relies on...
+      (exit-minibuffer)
+    (let ((flag (PC-do-completion 'exit)))
+      (and flag
+	   (if (or (eq flag 'complete)
+		   (not minibuffer-completion-confirm))
+	       (exit-minibuffer)
+	     (PC-temp-minibuffer-message " (Confirm)"))))))
+
+
+(defun PC-completion-help ()
+  "Like `minibuffer-completion-help', but allows \"b--di\"-style abbreviations.
+See `PC-complete' for details."
+  (interactive)
+  (if (eq (PC-was-meta-key) PC-meta-flag)
+      (minibuffer-completion-help)
+    (PC-do-completion 'help)))
+
+(defun PC-was-meta-key ()
+  (or (/= (length (this-command-keys)) 1)
+      (let ((key (aref (this-command-keys) 0)))
+	(if (integerp key)
+	    (>= key 128)
+	  (not (null (memq 'meta (event-modifiers key))))))))
+
+
+(defvar PC-ignored-extensions 'empty-cache)
+(defvar PC-delims 'empty-cache)
+(defvar PC-ignored-regexp nil)
+(defvar PC-word-failed-flag nil)
+(defvar PC-delim-regex nil)
+(defvar PC-ndelims-regex nil)
+(defvar PC-delims-list nil)
+
+(defun PC-do-completion (&optional mode beg end)
+  (or beg (setq beg (point-min)))
+  (or end (setq end (point-max)))
+  (let* ((table minibuffer-completion-table)
+	 (pred minibuffer-completion-predicate)
+	 (filename (memq table '(read-file-name-internal
+				 read-directory-name-internal)))
+	 (dirname nil)
+	 (str (buffer-substring beg end))
+	 (incname (and filename (string-match "<\\([^\"<>]*\\)>?$" str)))
+	 (ambig nil)
+	 basestr
+	 regex
+	 p offset
+	 (poss nil)
+	 helpposs
+	 (case-fold-search completion-ignore-case))
+
+    ;; Check if buffer contents can already be considered complete
+    (if (and (eq mode 'exit)
+	     (PC-is-complete-p str table pred))
+	'complete
+
+      ;; Do substitutions in directory names
+      (and filename
+	   (not (equal str (setq p (substitute-in-file-name str))))
+	   (progn
+	     (delete-region beg end)
+	     (insert p)
+	     (setq str p end (+ beg (length str)))))
+
+      ;; Prepare various delimiter strings
+      (or (equal PC-word-delimiters PC-delims)
+	  (setq PC-delims PC-word-delimiters
+		PC-delim-regex (concat "[" PC-delims "]")
+		PC-ndelims-regex (concat "[^" PC-delims "]*")
+		PC-delims-list (append PC-delims nil)))
+
+      ;; Look for wildcard expansions in directory name
+      (and filename
+	   (string-match "\\*.*/" str)
+	   (let ((pat str)
+		 files)
+	     (setq p (1+ (string-match "/[^/]*\\'" pat)))
+	     (while (setq p (string-match PC-delim-regex pat p))
+	       (setq pat (concat (substring pat 0 p)
+				 "*"
+				 (substring pat p))
+		     p (+ p 2)))
+	     (setq files (PC-expand-many-files (concat pat "*")))
+	     (if files
+		 (let ((dir (file-name-directory (car files)))
+		       (p files))
+		   (while (and (setq p (cdr p))
+			       (equal dir (file-name-directory (car p)))))
+		   (if p
+		       (setq filename nil table nil pred nil
+			     ambig t)
+		     (delete-region beg end)
+		     (setq str (concat dir (file-name-nondirectory str)))
+		     (insert str)
+		     (setq end (+ beg (length str)))))
+	       (setq filename nil table nil pred nil))))
+
+      ;; Strip directory name if appropriate
+      (if filename
+	  (if incname
+	      (setq basestr (substring str incname)
+		    dirname (substring str 0 incname))
+	    (setq basestr (file-name-nondirectory str)
+		  dirname (file-name-directory str)))
+	(setq basestr str))
+
+      ;; Convert search pattern to a standard regular expression
+      (setq regex (regexp-quote basestr)
+	    offset (if (and (> (length regex) 0)
+			    (not (eq (aref basestr 0) ?\*))
+			    (or (eq PC-first-char t)
+				(and PC-first-char filename))) 1 0)
+	    p offset)
+      (while (setq p (string-match PC-delim-regex regex p))
+	(if (eq (aref regex p) ? )
+	    (setq regex (concat (substring regex 0 p)
+				PC-ndelims-regex
+				PC-delim-regex
+				(substring regex (1+ p)))
+		  p (+ p (length PC-ndelims-regex) (length PC-delim-regex)))
+	  (let ((bump (if (memq (aref regex p)
+				'(?$ ?^ ?\. ?* ?+ ?? ?[ ?] ?\\))
+			  -1 0)))
+	    (setq regex (concat (substring regex 0 (+ p bump))
+				PC-ndelims-regex
+				(substring regex (+ p bump)))
+		  p (+ p (length PC-ndelims-regex) 1)))))
+      (setq p 0)
+      (if filename
+	  (while (setq p (string-match "\\\\\\*" regex p))
+	    (setq regex (concat (substring regex 0 p)
+				"[^/]*"
+				(substring regex (+ p 2))))))
+      ;;(setq the-regex regex)
+      (setq regex (concat "\\`" regex))
+
+      ;; Find an initial list of possible completions
+      (if (not (setq p (string-match (concat PC-delim-regex
+					     (if filename "\\|\\*" ""))
+				     str
+				     (+ (length dirname) offset))))
+
+	  ;; Minibuffer contains no hyphens -- simple case!
+	  (setq poss (all-completions str
+				      table
+				      pred))
+
+	;; Use all-completions to do an initial cull.  This is a big win,
+	;; since all-completions is written in C!
+	(let ((compl (all-completions (substring str 0 p)
+				      table
+				      pred)))
+	  (setq p compl)
+	  (while p
+	    (and (string-match regex (car p))
+		 (setq poss (cons (car p) poss)))
+	    (setq p (cdr p)))))
+
+      ;; Now we have a list of possible completions
+      (cond
+
+       ;; No valid completions found
+       ((null poss)
+	(if (and (eq mode 'word)
+		 (not PC-word-failed-flag))
+	    (let ((PC-word-failed-flag t))
+	      (delete-backward-char 1)
+	      (PC-do-completion 'word))
+	  (beep)
+	  (PC-temp-minibuffer-message (if ambig
+					  " (Ambiguous dir name)"
+					(if (eq mode 'help)
+					    " (No completions)"
+					  " (No match)")))
+	  nil))
+
+       ;; More than one valid completion found
+       ((or (cdr (setq helpposs poss))
+	    (memq mode '(help word)))
+
+	;; Handle completion-ignored-extensions
+	(and filename
+	     (not (eq mode 'help))
+	     (let ((p2 poss))
+
+	       ;; Build a regular expression representing the extensions list
+	       (or (equal completion-ignored-extensions PC-ignored-extensions)
+		   (setq PC-ignored-regexp
+			 (concat "\\("
+				 (mapconcat
+				  'regexp-quote
+				  (setq PC-ignored-extensions
+					completion-ignored-extensions)
+				  "\\|")
+				 "\\)\\'")))
+
+	       ;; Check if there are any without an ignored extension
+	       (setq p nil)
+	       (while p2
+		 (or (string-match PC-ignored-regexp (car p2))
+		     (setq p (cons (car p2) p)))
+		 (setq p2 (cdr p2)))
+
+	       ;; If there are "good" names, use them
+	       (and p (setq poss p))))
+
+	;; Is the actual string one of the possible completions?
+	(setq p (and (not (eq mode 'help)) poss))
+	(while (and p
+		    (not (equal (car p) basestr)))
+	  (setq p (cdr p)))
+	(if p
+
+	    (progn
+	      (if (null mode)
+		  (PC-temp-minibuffer-message " (Complete, but not unique)"))
+	      t)
+
+	  ;; If ambiguous, try for a partial completion
+	  (let ((improved nil)
+		prefix
+		(pt nil)
+		(skip "\\`"))
+
+	    ;; Check if next few letters are the same in all cases
+	    (if (and (not (eq mode 'help))
+		     (setq prefix (try-completion "" (mapcar 'list poss))))
+		(let ((first t) i)
+		  (if (eq mode 'word)
+		      (setq prefix (PC-chop-word prefix basestr)))
+		  (goto-char (+ beg (length dirname)))
+		  (while (and (progn
+				(setq i 0)
+				(while (< i (length prefix))
+				  (if (and (< (point) end)
+					   (eq (aref prefix i)
+					       (following-char)))
+				      (forward-char 1)
+				    (if (and (< (point) end)
+					     (or (and (looking-at " ")
+						      (memq (aref prefix i)
+							    PC-delims-list))
+						 (eq (downcase (aref prefix i))
+						     (downcase
+						      (following-char)))))
+					(progn
+					  (delete-char 1)
+					  (setq end (1- end)))
+				      (and filename (looking-at "\\*")
+					   (progn
+					     (delete-char 1)
+					     (setq end (1- end))))
+				      (setq improved t))
+				    (insert (substring prefix i (1+ i)))
+				    (setq end (1+ end)))
+				  (setq i (1+ i)))
+				(or pt (equal (point) beg)
+				    (setq pt (point)))
+				(looking-at PC-delim-regex))
+			      (setq skip (concat skip
+						 (regexp-quote prefix)
+						 PC-ndelims-regex)
+				    prefix (try-completion
+					    ""
+					    (mapcar
+					     (function
+					      (lambda (x)
+						(list
+						 (and (string-match skip x)
+						      (substring
+						       x
+						       (match-end 0))))))
+					     poss)))
+			      (or (> i 0) (> (length prefix) 0))
+			      (or (not (eq mode 'word))
+				  (and first (> (length prefix) 0)
+				       (setq first nil
+					     prefix (substring prefix 0 1))))))
+		  (goto-char (if (eq mode 'word) end
+			       (or pt beg)))))
+
+	    (if (and (eq mode 'word)
+		     (not PC-word-failed-flag))
+
+		(if improved
+
+		    ;; We changed it... would it be complete without the space?
+		    (if (PC-is-complete-p (buffer-substring 1 (1- end))
+					  table pred)
+			(delete-region (1- end) end)))
+
+	      (if improved
+
+		  ;; We changed it... enough to be complete?
+		  (and (eq mode 'exit)
+		       (PC-is-complete-p (buffer-string) table pred))
+
+		;; If totally ambiguous, display a list of completions
+		(if (or completion-auto-help
+			(eq mode 'help))
+		    (with-output-to-temp-buffer " *Completions*"
+		      (display-completion-list (sort helpposs 'string-lessp)))
+		  (PC-temp-minibuffer-message " (Next char not unique)"))
+		nil)))))
+
+       ;; Only one possible completion
+       (t
+	(if (equal basestr (car poss))
+	    (if (null mode)
+		(PC-temp-minibuffer-message " (Sole completion)"))
+	  (delete-region beg end)
+	  (insert (if filename
+		      (substitute-in-file-name (concat dirname (car poss)))
+		    (car poss))))
+	t)))))
+
+
+(defun PC-is-complete-p (str table pred)
+  (let ((res (if (listp table)
+		 (assoc str table)
+	       (if (vectorp table)
+		   (or (equal str "nil")   ; heh, heh, heh
+		       (intern-soft str table))
+		 (funcall table str pred 'lambda)))))
+    (and res
+	 (or (not pred)
+	     (and (not (listp table)) (not (vectorp table)))
+	     (funcall pred res))
+	 res)))
+
+(defun PC-chop-word (new old)
+  (let ((i -1)
+	(j -1))
+    (while (and (setq i (string-match PC-delim-regex old (1+ i)))
+		(setq j (string-match PC-delim-regex new (1+ j)))))
+    (if (and j
+	     (or (not PC-word-failed-flag)
+		 (setq j (string-match PC-delim-regex new (1+ j)))))
+	(substring new 0 (1+ j))
+      new)))
+
+(defvar PC-not-minibuffer nil)
+
+(defun PC-temp-minibuffer-message (m)
+  "A Lisp version of `temp_minibuffer_message' from minibuf.c."
+  (if PC-not-minibuffer
+      (progn
+	(message m)
+	(sit-for 2)
+	(message ""))
+    (if (fboundp 'temp-minibuffer-message)
+	(temp-minibuffer-message m)
+      (let ((savemax (point-max)))
+	(save-excursion
+	  (goto-char (point-max))
+	  (insert m))
+	(let ((inhibit-quit t))
+	  (sit-for 2)
+	  (delete-region savemax (point-max))
+	  (if quit-flag
+	      (setq quit-flag nil
+		    unread-command-char 7)))))))
+
+
+(defun PC-lisp-complete-symbol ()
+  "Perform completion on Lisp symbol preceding point.
+That symbol is compared against the symbols that exist
+and any additional characters determined by what is there
+are inserted.
+If the symbol starts just after an open-parenthesis,
+only symbols with function definitions are considered.
+Otherwise, all symbols with function definitions, values
+or properties are considered."
+  (interactive)
+  (let* ((end (point))
+	 (buffer-syntax (syntax-table))
+	 (beg (unwind-protect
+		  (save-excursion
+		    (if lisp-mode-syntax-table
+			(set-syntax-table lisp-mode-syntax-table))
+		    (backward-sexp 1)
+		    (while (= (char-syntax (following-char)) ?\')
+		      (forward-char 1))
+		    (point))
+		(set-syntax-table buffer-syntax)))
+	 (minibuffer-completion-table obarray)
+	 (minibuffer-completion-predicate
+	  (if (eq (char-after (1- beg)) ?\()
+	      'fboundp
+	    (function (lambda (sym)
+			(or (boundp sym) (fboundp sym)
+			    (symbol-plist sym))))))
+	 (PC-not-minibuffer t))
+    (PC-do-completion nil beg end)))
+
+
+;;; Wildcards in `C-x C-f' command.  This is independent from the main
+;;; completion code, except for `PC-expand-many-files' which is called
+;;; when "*"'s are found in the path during filename completion.  (The
+;;; above completion code always understands "*"'s, except in file paths,
+;;; without relying on the following code.)
+
+(defvar PC-many-files-list nil)
+
+(defun PC-try-load-many-files ()
+  (if (string-match "\\*" buffer-file-name)
+      (let* ((pat buffer-file-name)
+	     (files (PC-expand-many-files pat))
+	     (first (car files))
+	     (next files))
+	(kill-buffer (current-buffer))
+	(or files
+	    (error "No matching files"))
+	(save-window-excursion
+	  (while (setq next (cdr next))
+	    (let ((buf (find-file-noselect (car next))))
+	      (switch-to-buffer buf))))
+	;; This modifies the "buf" variable inside find-file-noselect.
+	(setq buf (get-file-buffer first))
+	(if buf
+	    nil   ; should do verify-visited-file-modtime stuff.
+	  (setq filename first)
+	  (setq buf (create-file-buffer filename))
+	  (set-buffer buf)
+	  (erase-buffer)
+	  (insert-file-contents filename t))
+	(if (cdr files)
+	    (setq PC-many-files-list (mapconcat
+				      (if (string-match "\\*.*/" pat)
+					  'identity
+					'file-name-nondirectory)
+				      (cdr files) ", ")
+		  find-file-hooks (cons 'PC-after-load-many-files
+					find-file-hooks)))
+	;; This modifies the "error" variable inside find-file-noselect.
+	(setq error nil)
+	t)
+    nil))
+
+(defun PC-after-load-many-files ()
+  (setq find-file-hooks (delq 'PC-after-load-many-files find-file-hooks))
+  (message "Also loaded %s." PC-many-files-list))
+
+(defun PC-expand-many-files (name)
+  (save-excursion
+    (set-buffer (generate-new-buffer " *Glob Output*"))
+    (erase-buffer)
+    (shell-command (concat "echo " name) t)
+    (goto-char (point-min))
+    (if (looking-at ".*No match")
+	nil
+      (insert "(\"")
+      (while (search-forward " " nil t)
+	(delete-backward-char 1)
+	(insert "\" \""))
+      (goto-char (point-max))
+      (delete-backward-char 1)
+      (insert "\")")
+      (goto-char (point-min))
+      (let ((files (read (current-buffer))))
+	(kill-buffer (current-buffer))
+	files))))
+
+(or PC-disable-wildcards
+    (memq 'PC-try-load-many-files find-file-not-found-hooks)
+    (setq find-file-not-found-hooks (cons 'PC-try-load-many-files
+					  find-file-not-found-hooks)))
+
+
+
+;;; Facilities for loading C header files.  This is independent from the
+;;; main completion code.  See also the variable `PC-include-file-path'
+;;; at top of this file.
+
+(defun PC-look-for-include-file ()
+  (if (string-match "[\"<]\\([^\"<>]*\\)[\">]?$" (buffer-file-name))
+      (let ((name (substring (buffer-file-name)
+			     (match-beginning 1) (match-end 1)))
+	    (punc (aref (buffer-file-name) (match-beginning 0)))
+	    (path nil)
+	    new-buf)
+	(kill-buffer (current-buffer))
+	(if (equal name "")
+	    (save-excursion
+	      (set-buffer (car (buffer-list)))
+	      (save-excursion
+		(beginning-of-line)
+		(if (looking-at
+		     "[ \t]*#[ \t]*include[ \t]+[<\"]\\(.+\\)[>\"][ \t]*[\n/]")
+		    (setq name (buffer-substring (match-beginning 1)
+						 (match-end 1))
+			  punc (char-after (1- (match-beginning 1))))
+		  ;; Suggested by Frank Siebenlist:
+		  (if (or (looking-at
+			   "[ \t]*([ \t]*load[ \t]+\"\\([^\"]+\\)\"")
+			  (looking-at
+			   "[ \t]*([ \t]*load-library[ \t]+\"\\([^\"]+\\)\"")
+			  (looking-at
+			   "[ \t]*([ \t]*require[ \t]+'\\([^\t )]+\\)[\t )]"))
+		      (progn
+			(setq name (buffer-substring (match-beginning 1)
+						     (match-end 1))
+			      punc ?\<
+			      path load-path)
+			(if (string-match "\\.elc$" name)
+			    (setq name (substring name 0 -1))
+			  (or (string-match "\\.el$" name)
+			      (setq name (concat name ".el")))))
+		    (error "Not on an #include line"))))))
+	(or (string-match "\\.[a-zA-Z0-9]+$" name)
+	    (setq name (concat name ".h")))
+	(if (eq punc ?\<)
+	    (let ((path (or path (PC-include-file-path))))
+	      (while (and path
+			  (not (file-exists-p
+				(concat (file-name-as-directory (car path))
+					name))))
+		(setq path (cdr path)))
+	      (if path
+		  (setq name (concat (file-name-as-directory (car path)) name))
+		(error "No such include file: <%s>" name)))
+	  (let ((dir (save-excursion
+		       (set-buffer (car (buffer-list)))
+		       default-directory)))
+	    (if (file-exists-p (concat dir name))
+		(setq name (concat dir name))
+	      (error "No such include file: \"%s\"" name))))
+	(setq new-buf (get-file-buffer name))
+	(if new-buf
+	    ;; no need to verify last-modified time for this!
+	    (set-buffer new-buf)
+	  (setq new-buf (create-file-buffer name))
+	  (set-buffer new-buf)
+	  (erase-buffer)
+	  (insert-file-contents name t))
+	(setq filename name
+	      error nil
+	      buf new-buf)
+	t)
+    nil))
+
+(defun PC-include-file-path ()
+  (or PC-include-file-path
+      (let ((env (getenv "INCPATH"))
+	    (path nil)
+	    pos)
+	(or env (error "No include file path specified"))
+	(while (setq pos (string-match ":[^:]+$" env))
+	  (setq path (cons (substring env (1+ pos)) path)
+		env (substring env 0 pos)))
+	path)))
+
+;;; This is adapted from lib-complete.el, by Mike Williams.
+(defun PC-include-file-all-completions (file search-path &optional full)
+  "Return all completions for FILE in any directory on SEARCH-PATH.
+If optional third argument FULL is non-nil, returned pathnames should be 
+absolute rather than relative to some directory on the SEARCH-PATH."
+  (setq search-path
+	(mapcar '(lambda (dir)
+		   (if dir (file-name-as-directory dir) default-directory))
+		search-path))
+  (if (file-name-absolute-p file)
+      ;; It's an absolute file name, so don't need search-path
+      (progn
+	(setq file (expand-file-name file))
+	(file-name-all-completions 
+	 (file-name-nondirectory file) (file-name-directory file)))
+    (let ((subdir (file-name-directory file))
+	  (ndfile (file-name-nondirectory file))
+	  file-lists)
+      ;; Append subdirectory part to each element of search-path
+      (if subdir
+	  (setq search-path
+		(mapcar '(lambda (dir) (concat dir subdir))
+			search-path)
+		file ))
+      ;; Make list of completions in each directory on search-path
+      (while search-path
+	(let* ((dir (car search-path))
+	       (subdir (if full dir subdir)))
+	  (if (file-directory-p dir)
+	      (progn
+		(setq file-lists
+		      (cons 
+		       (mapcar '(lambda (file) (concat subdir file))
+			       (file-name-all-completions ndfile 
+							  (car search-path)))
+		       file-lists))))
+	  (setq search-path (cdr search-path))))
+      ;; Compress out duplicates while building complete list (slloooow!)
+      (let ((sorted (sort (apply 'nconc file-lists)
+			  '(lambda (x y) (not (string-lessp x y)))))
+	    compressed)
+	(while sorted
+	  (if (equal (car sorted) (car compressed)) nil
+	    (setq compressed (cons (car sorted) compressed)))
+	  (setq sorted (cdr sorted)))
+	compressed))))
+
+(defvar PC-old-read-file-name-internal nil)
+
+(defun PC-read-include-file-name-internal (string dir action)
+  (if (string-match "<\\([^\"<>]*\\)>?$" string)
+      (let* ((name (substring string (match-beginning 1) (match-end 1)))
+	     (str2 (substring string (match-beginning 0)))
+	     (completion-table
+	      (mapcar (function (lambda (x) (list (format "<%s>" x))))
+		      (PC-include-file-all-completions
+		       name (PC-include-file-path)))))
+	(cond
+	 ((not completion-table) nil)
+	 ((eq action nil) (try-completion str2 completion-table nil))
+	 ((eq action t) (all-completions str2 completion-table nil))
+	 ((eq action 'lambda)
+	  (eq (try-completion str2 completion-table nil) t))))
+    (funcall PC-old-read-file-name-internal string dir action)))
+
+(or PC-disable-includes
+    (memq 'PC-look-for-include-file find-file-not-found-hooks)
+    (setq find-file-not-found-hooks (cons 'PC-look-for-include-file
+					  find-file-not-found-hooks)))
+
+(or PC-disable-includes
+    PC-old-read-file-name-internal
+    (progn
+      (setq PC-old-read-file-name-internal
+	    (symbol-function 'read-file-name-internal))
+      (fset 'read-file-name-internal 'PC-read-include-file-name-internal)))
+
+
+(provide 'complete)
+
+;;; End.