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+;; Expand a word trying various ways to find its expansion.
+;; Copyright (C) 1992 Free Software Foundation, Inc.
+;;
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+;; 
+;;  Author: Anders Holst (aho@sans.kth.se)
+;;
+;;  Last change: 4 January 1993
+
+;;  
+;;  DESCRIPTION
+;;  
+;;  `hippie-expand' is a single function for a lot of different kinds
+;;  of completions and expansions.  Called repeatedly it tries all
+;;  possible completions in succession. 
+;;  Which kinds of completions to try, and in which order, is
+;;  determined by the contents of `hippie-expand-try-functions-list'.
+;;  Much customization of `hippie-expand' can be made by changing the
+;;  order of, removing, or inserting new functions in this list.
+;;  Given a positive numeric argument, `hippie-expand' jumps directly
+;;  ARG functions forward in this list.  Given some other argument
+;;  (a negative argument or just Ctrl-U) it undoes the tried
+;;  completion.
+;;  If the variable `hippie-expand-verbose' is non-nil, `hippie-expand'
+;;  outputs in a message which try-function in the list that is used
+;;  currently (ie. was used currently and will be tried first the next
+;;  time).
+;;  See also the macro `make-hippie-expand-function' below.
+;;  
+;;  A short description of the current try-functions in this file:
+;;    `try-complete-file-name' : very convenient to have in any buffer,
+;;      and not just in the minibuffer or (some) shell-mode.  It goes
+;;      through all possible completions instead of just completing as
+;;      much as is unique.
+;;    `try-complete-file-name-partially' : To insert in the list just
+;;      before `try-complete-file-name' for those who want first to get
+;;      a file name completed only as many characters as is unique.
+;;      (NOTE: Not by default in `hippie-expand-try-functions-list'.)
+;;    `try-expand-all-abbrevs' : can be removed if you don't use abbrevs.
+;;      Otherwise it looks through all abbrev-tables, starting with
+;;      the local followed by the global. 
+;;    `try-expand-line' : Searches the buffer for an entire line that 
+;;      begins exactly as the current line.  Convenient sometimes, for 
+;;      example as a substitute for (or complement to) the history
+;;      list in shell-like buffers.  Remove it if you find it confusing.
+;;    `try-expand-line-all-buffers' : Like `try-expand-line' but searches
+;;      in all buffers (except the current).  (This may be a little
+;;      slow, don't use it unless you are really fond of `hippie-expand'.
+;;      NOTE: Not by default in hippie-expand-try-functions-list.)
+;;    `try-expand-dabbrev' : works exactly as dabbrev-expand (but of
+;;      course in a way compatible with the other try-functions).
+;;    `try-expand-dabbrev-all-buffers' : perhaps the most useful of them,
+;;      like `dabbrev-expand' but searches all Emacs buffers (except the
+;;      current) for matching words.  (No, I don't find this one
+;;      particularly slow.) 
+;;    `try-complete-lisp-symbol' : like `lisp-complete-symbol', but goes
+;;      through all possibilities instead of completing what is unique.
+;;      Might be tedious (usually a lot of possible completions) and
+;;      since its function is much like `lisp-complete-symbol', which
+;;      already has a key of its own, you might want to remove this.
+;;    `try-complete-lisp-symbol-partially' : To insert in the list just
+;;      before `try-complete-lisp-symbol' for those who first want to get
+;;      completion of what is unique in the name.  (NOTE: Not by
+;;      default in hippie-expand-try-functions-list.)
+;;
+;;  To write new try-functions, consider the following:
+;;  Each try-function takes one argument OLD which is nil the first
+;;  time the function is called and true in succeeding calls for the
+;;  same string to complete.  The first time the function has to
+;;  extract the string before point to complete, and substitute the
+;;  first completion alternative for it.  On following calls it has to
+;;  substitute the next possible completion for the last tried string.
+;;  The try-function is to return t as long as it finds new
+;;  possible completions.  When there are no more alternatives it has
+;;  to restore the text before point to its original contents, and
+;;  return nil (don't beep or message or anything).
+;;  The try-function can (should) use the following functions:
+;;    `he-init-string' : Initializes the text to substitute to the
+;;      contents of the region BEGIN to END.  Also sets the variable
+;;      `he-search-string' to the text to expand.
+;;    `he-substitute-string' : substitutes STR into the region
+;;      initialized with `he-init-string'.  (An optional second argument
+;;      TRANS-CASE non-nil, means transfer of case from the abbreviation
+;;      to the expansion is ok if that is enabled in the buffer.)
+;;    `he-reset-string' : Resets the initialized region to its original
+;;      contents.
+;;  There is also a variable: `he-tried-table' which is meant to contain
+;;  all tried expansions so far.  The try-function can check this 
+;;  variable to see whether an expansion has already been tried
+;;  (hint: `he-string-member'), and add its own tried expansions to it.
+;;
+;;
+;;  KNOWN BUGS
+;;
+;;  It may happen that some completion suggestion occurs twice, in
+;;  spite of the use of `he-tried-table' to prevent that.  This is 
+;;  because different try-functions may try to complete different
+;;  lengths of text, and thus put different amounts of the
+;;  text in `he-try-table'.  Anyway this seems to occur seldom enough not
+;;  to be too disturbing.  Also it should NOT bee possible for the
+;;  opposite situation to occur, that `hippie-expand' misses some
+;;  suggestion because it thinks it has already tried it.
+;;
+;;  
+;;  ACKNOWLEDGEMENT
+;;
+;;  I want to thank Mikael Djurfeldt in discussions with whom the idea
+;;  of this function took form.
+;;  I am also grateful to all those who have given me suggestions on
+;;  how to improve it.
+;;
+
+
+(defvar he-num -1)
+
+(defvar he-string-beg ())
+
+(defvar he-string-end ())
+
+(defvar he-search-string ())
+
+(defvar he-expand-list ())
+
+(defvar he-tried-table ())
+
+(defvar he-search-loc ())
+
+(defvar he-search-bw ())
+
+(defvar he-search-bufs ())
+
+(defvar hippie-expand-try-functions-list '(try-complete-file-name
+					   try-expand-all-abbrevs
+					   try-expand-line
+					   try-expand-dabbrev
+					   try-expand-dabbrev-all-buffers
+					   try-complete-lisp-symbol)
+  "The list of expansion functions tried in order by `hippie-expand'.
+To change the behavior of `hippie-expand', remove, change the order of,
+or insert functions in this list.")
+
+(defvar hippie-expand-verbose t
+  "*Non-nil makes `hippie-expand' output which function it is trying.")
+
+(defun hippie-expand (arg)
+  "Try to expand text before point, using multiple methods.
+The expansion functions in `hippie-expand-try-functions-list' are
+tried in order, until a possible expansion is found.  Repeated
+application of `hippie-expand' inserts successively possible
+expansions.  
+With a positive numeric argument, jumps directly to the ARG next
+function in this list.  With a negative argument or just \\[universal-argument], 
+undoes the expansion." 
+  (interactive "P")
+  (if (or (not arg) 
+	  (and (integerp arg) (> arg 0)))
+      (let ((first (or (= he-num -1)
+		       (not (equal this-command last-command)))))
+	(if first
+	    (progn
+	      (setq he-num -1)
+	      (setq he-tried-table nil)))
+	(if arg
+	    (if (not first) (he-reset-string))
+	    (setq arg 0))
+	(let ((i (max (+ he-num arg) 0)))
+	  (while (not (or (>= i (length hippie-expand-try-functions-list))
+			  (apply (nth i hippie-expand-try-functions-list) 
+				 (list (= he-num i)))))
+	    (setq i (1+ i)))
+	  (setq he-num i))
+	(if (>= he-num (length hippie-expand-try-functions-list))
+	    (progn
+	      (setq he-num -1)
+	      (if first
+		  (message "No expansion found")
+		  (message "No further expansions found"))
+	      (ding))
+	    (if hippie-expand-verbose
+		(message (concat "Using "
+				 (prin1-to-string (nth he-num 
+				   hippie-expand-try-functions-list)))))))
+      (if (>= he-num 0)
+	  (progn
+	    (setq he-num -1)
+	    (he-reset-string)
+	    (if hippie-expand-verbose
+		(message "Undoing expansions"))))))
+      
+;; Initializes the region to expand (to between BEG and END).
+(defun he-init-string (beg end)
+  (setq he-string-beg beg)
+  (setq he-string-end end)
+  (setq he-search-string (buffer-substring beg end)))
+
+;; Resets the expanded region to its original contents.
+(defun he-reset-string ()
+  (delete-region he-string-beg he-string-end)
+  (insert he-search-string)
+  (setq he-string-end (point)))
+
+;; Substitutes an expansion STR into the correct region (the region
+;; initialized with `he-init-string'). 
+;; An optional argument TRANS-CASE means that it is ok to transfer case
+;; from the abbreviation to the expansion if that is possible, and is
+;; enabled in the buffer.
+(defun he-substitute-string (str &optional trans-case)
+  (let ((trans-case (and trans-case
+			 case-replace
+			 case-fold-search
+			 (he-transfer-case-ok str he-search-string))))
+    (he-reset-string)
+    (goto-char he-string-beg)
+    (search-forward he-search-string)
+    (replace-match (if trans-case (downcase str) str)
+		   (not trans-case)
+		   'literal)
+    (setq he-string-end (point))))
+
+(defun he-ordinary-case-p (str)
+  (or (string= str (downcase str))
+      (string= str (upcase str))
+      (string= str (capitalize str))))
+
+(defun he-transfer-case-ok (to-str from-str)
+  (and (not (string= from-str (substring to-str 0 (length from-str))))
+         ;; otherwise transfer is not needed (and this also solves
+	 ;; some obscure situations)
+       (he-ordinary-case-p to-str)
+         ;; otherwise case may be significant 
+       (he-ordinary-case-p from-str)
+         ;; otherwise replace-match wont know what to do
+  ))
+
+;; Check if STR is a member of LST.
+;; Ignore case if `case-replace' and `case-fold-search' are both t.
+(defun he-string-member (str lst)
+  (while (and lst
+	      (not
+	       (if (and case-fold-search case-replace)
+		   (string= (downcase (car lst)) (downcase str))
+		   (string= (car lst) str))))
+    (setq lst (cdr lst)))
+  lst)
+
+;;  For the real hippie-expand enthusiast: A macro that makes it
+;;  possible to use many functions like hippie-expand, but with
+;;  different try-functions-lists.
+;;  Usage is for example:
+;;    (fset 'my-complete-file (make-hippie-expand-function
+;;                             '(try-complete-file-name-partially
+;;                               try-complete-file-name)))
+;;    (fset 'my-complete-line (make-hippie-expand-function
+;;                             '(try-expand-line
+;;                               try-expand-line-all-buffers)))
+;;  
+(defmacro make-hippie-expand-function (try-list &optional verbose)
+  "Construct a function similar to `hippie-expand'.
+Make it use the expansion functions in TRY-LIST.  An optional second
+argument VERBOSE non-nil makes the function verbose."
+  (` '(lambda (arg)
+       (, (concat 
+           "Try to expand text before point, using the following functions: \n"
+	   (mapconcat 'prin1-to-string (eval try-list) ", ")))
+       (interactive "P")
+       (let ((hippie-expand-try-functions-list (, try-list))
+	     (hippie-expand-verbose (, verbose)))
+	 (hippie-expand arg)))))
+
+
+;;;  Here follows the try-functions and their requisites:
+
+(defun try-complete-file-name (old)
+  "Try to complete text as a file name.
+The argument OLD has to be nil the first call of this function, and t
+for subsequent calls (for further possible completions of the same
+string).  It returns t if a new completion is found, nil otherwise."
+  (if (not old)
+      (progn 
+	(he-init-string (he-file-name-beg) (point))
+	(let ((name-part (file-name-nondirectory he-search-string))
+	      (dir-part (expand-file-name (or (file-name-directory
+					       he-search-string) ""))))
+	  (if (not (he-string-member name-part he-tried-table))
+	      (setq he-tried-table (cons name-part he-tried-table)))
+	  (if (and (not (equal he-search-string ""))
+		   (file-directory-p dir-part))
+	      (setq he-expand-list (sort (file-name-all-completions 
+					  name-part
+					  dir-part)
+					 'string-lessp))
+	      (setq he-expand-list ())))))
+
+  (while (and he-expand-list
+	      (he-string-member (car he-expand-list) he-tried-table))
+    (setq he-expand-list (cdr he-expand-list)))
+  (if (null he-expand-list)
+      (progn
+	(he-reset-string)
+	())
+      (let ((filename (concat (file-name-directory he-search-string)
+			      (car he-expand-list))))
+	(he-substitute-string filename)
+	(setq he-tried-table (cons (car he-expand-list) he-tried-table))
+	(setq he-expand-list (cdr he-expand-list))
+	t)))
+
+(defun try-complete-file-name-partially (old)
+  "Try to complete text as a file name, as many characters as unique.
+The argument OLD has to be nil the first call of this function.  It
+returns t if a unique, possibly partial, completion is found, nil 
+otherwise."
+  (let ((expansion ()))
+    (if (not old)
+	(progn 
+	  (he-init-string (he-file-name-beg) (point))
+	  (let ((name-part (file-name-nondirectory he-search-string))
+		(dir-part (expand-file-name (or (file-name-directory
+						 he-search-string) ""))))
+	    (if (and (not (equal he-search-string ""))
+		     (file-directory-p dir-part))
+		(setq expansion (file-name-completion name-part
+						      dir-part)))
+	    (if (or (eq expansion t)
+		    (string= expansion name-part))
+		(setq expansion ())))))
+
+    (if (not expansion)
+	(progn
+	  (he-reset-string)
+	  ())
+	(let ((filename (concat (file-name-directory he-search-string)
+				expansion)))
+	  (he-substitute-string filename)
+	  (setq he-tried-table (cons expansion he-tried-table))
+	  t))))
+
+(defun he-file-name-beg ()
+  (let ((skips "-a-zA-Z0-9_./~^#$"))
+    (save-excursion
+      (skip-chars-backward skips)
+      (point))))
+
+(defun try-complete-lisp-symbol (old)
+  "Try to complete word as an Emacs Lisp symbol.
+The argument OLD has to be nil the first call of this function, and t
+for subsequent calls (for further possible completions of the same
+string).  It returns t if a new completion is found, nil otherwise."
+  (if (not old)
+      (progn 
+	(he-init-string (he-lisp-symbol-beg) (point))
+	(if (not (he-string-member he-search-string he-tried-table))
+	    (setq he-tried-table (cons he-search-string he-tried-table)))
+	(setq he-expand-list 
+	      (and (not (equal he-search-string ""))
+		   (sort (all-completions he-search-string obarray
+					  (function (lambda (sym)
+					    (or (boundp sym)
+						(fboundp sym)
+						(symbol-plist sym)))))
+			 'string-lessp)))))
+  (while (and he-expand-list
+	      (he-string-member (car he-expand-list) he-tried-table))
+    (setq he-expand-list (cdr he-expand-list)))
+  (if (null he-expand-list)
+      (progn
+	(he-reset-string)
+	())
+      (progn
+	(he-substitute-string (car he-expand-list))
+	(setq he-tried-table (cons (car he-expand-list) he-tried-table))
+	(setq he-expand-list (cdr he-expand-list))
+	t)))
+
+(defun try-complete-lisp-symbol-partially (old)
+  "Try to complete as an Emacs Lisp symbol, as many characters as unique.
+The argument OLD has to be nil the first call of this function.  It
+returns t if a unique, possibly partial, completion is found, nil 
+otherwise."
+  (let ((expansion ()))
+    (if (not old)
+	(progn 
+	  (he-init-string (he-lisp-symbol-beg) (point))
+	  (if (not (string= he-search-string ""))
+	      (setq expansion 
+		    (try-completion he-search-string obarray
+				    (function (lambda (sym)
+				      (or (boundp sym)
+					  (fboundp sym)
+					  (symbol-plist sym)))))))
+	  (if (or (eq expansion t)
+		  (string= expansion he-search-string))
+	      (setq expansion ()))))
+
+  (if (not expansion)
+      (progn
+	(he-reset-string)
+	())
+      (progn
+	(he-substitute-string expansion)
+	(setq he-tried-table (cons expansion he-tried-table))
+	t))))
+
+(defun he-lisp-symbol-beg ()
+  (let ((skips "-a-zA-Z0-9_."))
+    (save-excursion
+      (skip-chars-backward skips)
+      (point))))
+
+(defun try-expand-line (old)
+  "Try to complete the current line to an entire line in the buffer.
+The argument OLD has to be nil the first call of this function, and t
+for subsequent calls (for further possible completions of the same
+string).  It returns t if a new completion is found, nil otherwise."
+  (let ((expansion ())
+	(strip-prompt (and (get-buffer-process (current-buffer))
+			   shell-prompt-pattern)))
+    (if (not old)
+	(progn
+	  (he-init-string (he-line-beg strip-prompt) (point))
+	  (setq he-search-loc he-string-beg)
+	  (setq he-search-bw t)))
+
+    (if (not (equal he-search-string ""))
+	(save-excursion
+	  ;; Try looking backward unless inhibited.
+	  (if he-search-bw
+	      (progn 
+		(goto-char he-search-loc)
+		(setq expansion (he-line-search he-search-string
+						strip-prompt t))
+		(setq he-search-loc (point-marker))
+		(if (not expansion)
+		    (progn
+		      (setq he-search-loc he-string-end)
+		      (setq he-search-bw ())))))
+	  
+	  (if (not expansion) ; Then look forward.
+	      (progn 
+		(goto-char he-search-loc)
+		(setq expansion (he-line-search he-search-string 
+						strip-prompt nil))
+		(setq he-search-loc (point-marker))))))
+
+    (if (not expansion)
+	(progn
+	  (he-reset-string)
+	  ())
+	(progn
+	  (he-substitute-string expansion t)
+	  (setq he-tried-table (cons expansion he-tried-table))
+	  t))))
+
+(defun try-expand-line-all-buffers (old)
+  "Try to complete the current line, searching all other buffers.
+The argument OLD has to be nil the first call of this function, and t
+for subsequent calls (for further possible completions of the same
+string).  It returns t if a new completion is found, nil otherwise."
+  (let ((expansion ())
+	(strip-prompt (and (get-buffer-process (current-buffer))
+			   shell-prompt-pattern))
+	(buf (current-buffer)))
+    (if (not old)
+	(progn
+	  (he-init-string (he-line-beg strip-prompt) (point))
+	  (setq he-search-loc 0)
+	  (setq he-search-bufs (buffer-list))))
+
+    (if (not (equal he-search-string ""))
+	(while (and he-search-bufs (not expansion))
+	  (set-buffer (car he-search-bufs))
+	  (if (and (not (eq (current-buffer) buf))
+		   (not (eq major-mode 'dired-mode)))
+		   ;; dont search dired buffers
+	      (save-excursion
+		(goto-char he-search-loc)
+		(setq expansion (he-line-search he-search-string
+						strip-prompt nil))
+		(setq he-search-loc (point-marker))))
+	  (if expansion
+	      (setq he-tried-table (cons expansion he-tried-table))
+	      (progn
+		(setq he-search-loc 0)
+		(setq he-search-bufs (cdr he-search-bufs))))))
+
+    (set-buffer buf)
+    (if (not expansion)
+	(progn
+	  (he-reset-string)
+	  ())
+	(progn
+	  (he-substitute-string expansion t)
+	  t))))
+
+(defun he-line-search (str strip-prompt reverse) 
+  (let ((result ()))
+    (while (and (not result)
+		(if reverse
+		    (re-search-backward 
+		     (he-line-search-regexp str strip-prompt)
+		     nil t)
+		    (re-search-forward
+		     (he-line-search-regexp str strip-prompt)
+		     nil t)))
+      (setq result (buffer-substring (match-beginning 2) (match-end 2)))
+      (if (he-string-member result he-tried-table)
+	  (setq result nil)))	            ; if already in table, ignore
+    result))
+
+(defun he-line-beg (strip-prompt)
+  (save-excursion
+    (end-of-line)
+    (if (re-search-backward (he-line-search-regexp "" strip-prompt) 
+			    (save-excursion (beginning-of-line)
+					    (point)) t)
+	(match-beginning 2)
+      (beginning-of-line)
+      (point))))
+
+(defun he-line-search-regexp (pat strip-prompt)
+  (if strip-prompt
+      (concat "\\(" shell-prompt-pattern "\\|^\\s-*\\)\\("
+	      (regexp-quote pat)
+	      "[^\n]*[^ \t\n]\\)")
+      (concat "^\\(\\s-*\\)\\(" 
+	      (regexp-quote pat)
+	      "[^\n]*[^ \t\n]\\)")))
+
+(defun try-expand-all-abbrevs (old)
+  "Try to expand word before point according to all abbrev tables.
+The argument OLD has to be nil the first call of this function, and t
+for subsequent calls (for further possible expansions of the same
+string).  It returns t if a new expansion is found, nil otherwise."
+  (if (not old)
+      (progn
+	(he-init-string (he-dabbrev-beg) (point))
+	(setq he-expand-list 
+	      (and (not (equal he-search-string ""))
+		   (mapcar (function (lambda (sym)
+			     (abbrev-expansion he-search-string 
+					       (eval sym))))
+			   (append '(local-abbrev-table 
+				     global-abbrev-table)
+				   abbrev-table-name-list))))))
+  (while (and he-expand-list
+	      (or (not (car he-expand-list))
+		  (he-string-member (car he-expand-list) he-tried-table)))
+    (setq he-expand-list (cdr he-expand-list)))
+  (if (null he-expand-list)
+      (progn
+	(he-reset-string)
+	())
+      (progn
+	(he-substitute-string (car he-expand-list))
+	(setq he-tried-table (cons (car he-expand-list) he-tried-table))
+	(setq he-expand-list (cdr he-expand-list))
+	t)))
+
+(defun try-expand-dabbrev (old)
+  "Try to expand word \"dynamically\", searching the current buffer.
+The argument OLD has to be nil the first call of this function, and t
+for subsequent calls (for further possible expansions of the same
+string).  It returns t if a new expansion is found, nil otherwise."
+  (let ((expansion ()))
+    (if (not old)
+	(progn
+	  (he-init-string (he-dabbrev-beg) (point))
+	  (setq he-search-loc he-string-beg)
+	  (setq he-search-bw t)))
+
+    (if (not (equal he-search-string ""))
+	(save-excursion
+	  ;; Try looking backward unless inhibited.
+	  (if he-search-bw
+	      (progn 
+		(goto-char he-search-loc)
+		(setq expansion (he-dab-search he-search-string t))
+		(setq he-search-loc (point-marker))
+		(if (not expansion)
+		    (progn
+		      (setq he-search-loc he-string-end)
+		      (setq he-search-bw ())))))
+	  
+	  (if (not expansion) ; Then look forward.
+	      (progn 
+		(goto-char he-search-loc)
+		(setq expansion (he-dab-search he-search-string nil))
+		(setq he-search-loc (point-marker))))))
+	
+    (if (not expansion)
+	(progn
+	  (he-reset-string)
+	  ())
+	(progn
+	  (he-substitute-string expansion t)
+	  (setq he-tried-table (cons expansion he-tried-table))
+	  t))))
+
+(defun try-expand-dabbrev-all-buffers (old)
+  "Tries to expand word \"dynamically\", searching all other buffers.
+The argument OLD has to be nil the first call of this function, and t
+for subsequent calls (for further possible expansions of the same
+string).  It returns t if a new expansion is found, nil otherwise."
+  (let ((expansion ())
+	(buf (current-buffer)))
+    (if (not old)
+	(progn
+	  (he-init-string (he-dabbrev-beg) (point))
+	  (setq he-search-loc 0)
+	  (setq he-search-bufs (buffer-list))))
+
+    (if (not (equal he-search-string ""))
+	(while (and he-search-bufs (not expansion))
+	  (set-buffer (car he-search-bufs))
+	  (if (and (not (eq (current-buffer) buf))
+		   (not (eq major-mode 'dired-mode))) 
+		   ;; dont search dired buffers
+	      (save-excursion
+		(goto-char he-search-loc)
+		(setq expansion (he-dab-search he-search-string nil))
+		(setq he-search-loc (point-marker))))
+	  (if expansion
+	      (setq he-tried-table (cons expansion he-tried-table))
+	      (progn
+		(setq he-search-loc 0)
+		(setq he-search-bufs (cdr he-search-bufs))))))
+
+    (set-buffer buf)
+    (if (not expansion)
+	(progn
+	  (he-reset-string)
+	  ())
+	(progn
+	  (he-substitute-string expansion t)
+	  t))))
+
+(defun he-dab-search-regexp (pat)
+  (concat "\\b" (regexp-quote pat) 
+	  "\\(\\sw\\|\\s_\\)+"))
+
+(defun he-dab-search (pattern reverse)
+  (let ((result ()))
+    (while (and (not result) 
+		(if reverse
+		     (re-search-backward (he-dab-search-regexp pattern)
+					 nil t)
+		     (re-search-forward (he-dab-search-regexp pattern)
+					nil t)))
+      (setq result (buffer-substring (match-beginning 0) (match-end 0)))
+      (if (he-string-member result he-tried-table)
+	  (setq result nil)))	            ; if already in table, ignore
+    result))
+
+(defun he-dabbrev-beg ()
+  (let ((skips "-a-zA-Z0-9_."))
+    (save-excursion
+      (skip-chars-backward skips)
+      (skip-chars-forward "-_.")
+      (point))))
+