xemacs-beta: lisp/subr.el comparison

comparison lisp/subr.el @ 428:3ecd8885ac67 r21-2-22

Import from CVS: tag r21-2-22

author	cvs
date	Mon, 13 Aug 2007 11:28:15 +0200
parents
children	abe6d1db359e

comparison

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-:0a0253eac470
+:3ecd8885ac67
+;;; subr.el --- basic lisp subroutines for XEmacs
+;; Copyright (C) 1985, 1986, 1992, 1994-5, 1997 Free Software Foundation, Inc.
+;; Copyright (C) 1995 Tinker Systems and INS Engineering Corp.
+;; Copyright (C) 1995 Sun Microsystems.
+;; Maintainer: XEmacs Development Team
+;; Keywords: extensions, dumped
+;; This file is part of XEmacs.
+;; XEmacs 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.
+;; XEmacs 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 XEmacs; see the file COPYING.  If not, write to the Free
+;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+;; 02111-1307, USA.
+;;; Synched up with: FSF 19.34.
+;;; Commentary:
+;; This file is dumped with XEmacs.
+;; There's not a whole lot in common now with the FSF version,
+;; be wary when applying differences.  I've left in a number of lines
+;; of commentary just to give diff(1) something to synch itself with to
+;; provide useful context diffs. -sb
+;;; Code:
+;;;; Lisp language features.
+(defmacro lambda (&rest cdr)
+"Return a lambda expression.
+A call of the form (lambda ARGS DOCSTRING INTERACTIVE BODY) is
+self-quoting; the result of evaluating the lambda expression is the
+expression itself.  The lambda expression may then be treated as a
+function, i.e., stored as the function value of a symbol, passed to
+funcall or mapcar, etc.
+ARGS should take the same form as an argument list for a `defun'.
+DOCSTRING is an optional documentation string.
+If present, it should describe how to call the function.
+But documentation strings are usually not useful in nameless functions.
+INTERACTIVE should be a call to the function `interactive', which see.
+It may also be omitted.
+BODY should be a list of lisp expressions."
+`(function (lambda ,@cdr)))
+(defmacro defun-when-void (&rest args)
+"Define a function, just like `defun', unless it's already defined.
+Used for compatibility among different emacs variants."
+`(if (fboundp ',(car args))
+nil
+(defun ,@args)))
+(defmacro define-function-when-void (&rest args)
+"Define a function, just like `define-function', unless it's already defined.
+Used for compatibility among different emacs variants."
+`(if (fboundp ,(car args))
+nil
+(define-function ,@args)))
+;;;; Keymap support.
+;; XEmacs: removed to keymap.el
+;;;; The global keymap tree.
+;;; global-map, esc-map, and ctl-x-map have their values set up in
+;;; keymap.c; we just give them docstrings here.
+;;;; Event manipulation functions.
+;; XEmacs: This stuff is done in C Code.
+;;;; Obsolescent names for functions.
+;; XEmacs: not used.
+;; XEmacs:
+(defun local-variable-if-set-p (sym buffer)
+"Return t if SYM would be local to BUFFER after it is set.
+A nil value for BUFFER is *not* the same as (current-buffer), but
+can be used to determine whether `make-variable-buffer-local' has been
+called on SYM."
+(local-variable-p sym buffer t))
+;;;; Hook manipulation functions.
+;; (defconst run-hooks 'run-hooks ...)
+(defun make-local-hook (hook)
+"Make the hook HOOK local to the current buffer.
+When a hook is local, its local and global values
+work in concert: running the hook actually runs all the hook
+functions listed in *either* the local value *or* the global value
+of the hook variable.
+This function works by making `t' a member of the buffer-local value,
+which acts as a flag to run the hook functions in the default value as
+well.  This works for all normal hooks, but does not work for most
+non-normal hooks yet.  We will be changing the callers of non-normal
+hooks so that they can handle localness; this has to be done one by
+one.
+This function does nothing if HOOK is already local in the current
+buffer.
+Do not use `make-local-variable' to make a hook variable buffer-local."
+(if (local-variable-p hook (current-buffer)) ; XEmacs
+nil
+(or (boundp hook) (set hook nil))
+(make-local-variable hook)
+(set hook (list t))))
+(defun add-hook (hook function &optional append local)
+"Add to the value of HOOK the function FUNCTION.
+FUNCTION is not added if already present.
+FUNCTION is added (if necessary) at the beginning of the hook list
+unless the optional argument APPEND is non-nil, in which case
+FUNCTION is added at the end.
+The optional fourth argument, LOCAL, if non-nil, says to modify
+the hook's buffer-local value rather than its default value.
+This makes no difference if the hook is not buffer-local.
+To make a hook variable buffer-local, always use
+`make-local-hook', not `make-local-variable'.
+HOOK should be a symbol, and FUNCTION may be any valid function.  If
+HOOK is void, it is first set to nil.  If HOOK's value is a single
+function, it is changed to a list of functions."
+(or (boundp hook) (set hook nil))
+(or (default-boundp hook) (set-default hook nil))
+;; If the hook value is a single function, turn it into a list.
+(let ((old (symbol-value hook)))
+(if (or (not (listp old)) (eq (car old) 'lambda))
+	(set hook (list old))))
+(if (or local
+	  ;; Detect the case where make-local-variable was used on a hook
+	  ;; and do what we used to do.
+	  (and (local-variable-if-set-p hook (current-buffer)) ; XEmacs
+	       (not (memq t (symbol-value hook)))))
+;; Alter the local value only.
+(or (if (consp function)
+	      (member function (symbol-value hook))
+	    (memq function (symbol-value hook)))
+	  (set hook
+	       (if append
+		   (append (symbol-value hook) (list function))
+		 (cons function (symbol-value hook)))))
+;; Alter the global value (which is also the only value,
+;; if the hook doesn't have a local value).
+(or (if (consp function)
+	    (member function (default-value hook))
+	  (memq function (default-value hook)))
+	(set-default hook
+		     (if append
+			 (append (default-value hook) (list function))
+		       (cons function (default-value hook)))))))
+(defun remove-hook (hook function &optional local)
+"Remove from the value of HOOK the function FUNCTION.
+HOOK should be a symbol, and FUNCTION may be any valid function.  If
+FUNCTION isn't the value of HOOK, or, if FUNCTION doesn't appear in the
+list of hooks to run in HOOK, then nothing is done.  See `add-hook'.
+The optional third argument, LOCAL, if non-nil, says to modify
+the hook's buffer-local value rather than its default value.
+This makes no difference if the hook is not buffer-local.
+To make a hook variable buffer-local, always use
+`make-local-hook', not `make-local-variable'."
+(if (or (not (boundp hook))		;unbound symbol, or
+	  (not (default-boundp 'hook))
+	  (null (symbol-value hook))	;value is nil, or
+	  (null function))		;function is nil, then
+nil				;Do nothing.
+(if (or local
+	    ;; Detect the case where make-local-variable was used on a hook
+	    ;; and do what we used to do.
+	    (and (local-variable-p hook (current-buffer))
+		 (not (memq t (symbol-value hook)))))
+	(let ((hook-value (symbol-value hook)))
+	  (if (and (consp hook-value) (not (functionp hook-value)))
+	      (if (member function hook-value)
+		  (setq hook-value (delete function (copy-sequence hook-value))))
+	    (if (equal hook-value function)
+		(setq hook-value nil)))
+	  (set hook hook-value))
+(let ((hook-value (default-value hook)))
+	(if (and (consp hook-value) (not (functionp hook-value)))
+	    (if (member function hook-value)
+		(setq hook-value (delete function (copy-sequence hook-value))))
+	  (if (equal hook-value function)
+	      (setq hook-value nil)))
+	(set-default hook hook-value)))))
+(defun add-to-list (list-var element)
+"Add to the value of LIST-VAR the element ELEMENT if it isn't there yet.
+The test for presence of ELEMENT is done with `equal'.
+If you want to use `add-to-list' on a variable that is not defined
+until a certain package is loaded, you should put the call to `add-to-list'
+into a hook function that will be run only after loading the package.
+`eval-after-load' provides one way to do this.  In some cases
+other hooks, such as major mode hooks, can do the job."
+(or (member element (symbol-value list-var))
+(set list-var (cons element (symbol-value list-var)))))
+;; XEmacs additions
+;; called by Fkill_buffer()
+(defvar kill-buffer-hook nil
+"Function or functions to be called when a buffer is killed.
+The value of this variable may be buffer-local.
+The buffer about to be killed is current when this hook is run.")
+;; called by Frecord_buffer()
+(defvar record-buffer-hook nil
+"Function or functions to be called when a buffer is recorded.
+The value of this variable may be buffer-local.
+The buffer being recorded is passed as an argument to the hook.")
+;; in C in FSFmacs
+(defvar kill-emacs-hook nil
+"Function or functions to be called when `kill-emacs' is called,
+just before emacs is actually killed.")
+;; not obsolete.
+;; #### These are a bad idea, because the CL RPLACA and RPLACD
+;; return the cons cell, not the new CAR/CDR.         -hniksic
+;; The proper definition would be:
+;; (defun rplaca (conscell newcar)
+;;   (setcar conscell newcar)
+;;   conscell)
+;; ...and analogously for RPLACD.
+(define-function 'rplaca 'setcar)
+(define-function 'rplacd 'setcdr)
+(defun copy-symbol (symbol &optional copy-properties)
+"Return a new uninterned symbol with the same name as SYMBOL.
+If COPY-PROPERTIES is non-nil, the new symbol will have a copy of
+SYMBOL's value, function, and property lists."
+(let ((new (make-symbol (symbol-name symbol))))
+(when copy-properties
+;; This will not copy SYMBOL's chain of forwarding objects, but
+;; I think that's OK.  Callers should not expect such magic to
+;; keep working in the copy in the first place.
+(and (boundp symbol)
+	   (set new (symbol-value symbol)))
+(and (fboundp symbol)
+	   (fset new (symbol-function symbol)))
+(setplist new (copy-list (symbol-plist symbol))))
+new))
+;;;; String functions.
+;; XEmacs
+(defun replace-in-string (str regexp newtext &optional literal)
+"Replace all matches in STR for REGEXP with NEWTEXT string,
+and returns the new string.
+Optional LITERAL non-nil means do a literal replacement.
+Otherwise treat \\ in NEWTEXT string as special:
+\\& means substitute original matched text,
+\\N means substitute match for \(...\) number N,
+\\\\ means insert one \\."
+(check-argument-type 'stringp str)
+(check-argument-type 'stringp newtext)
+(let ((rtn-str "")
+	(start 0)
+	(special)
+	match prev-start)
+(while (setq match (string-match regexp str start))
+(setq prev-start start
+	    start (match-end 0)
+	    rtn-str
+	    (concat
+	      rtn-str
+	      (substring str prev-start match)
+	      (cond (literal newtext)
+		    (t (mapconcat
+			(lambda (c)
+			  (if special
+			      (progn
+				(setq special nil)
+				(cond ((eq c ?\\) "\\")
+				      ((eq c ?&)
+				       (substring str
+						  (match-beginning 0)
+						  (match-end 0)))
+				      ((and (>= c ?0) (<= c ?9))
+				       (if (> c (+ ?0 (length
+						       (match-data))))
+					   ;; Invalid match num
+					   (error "Invalid match num: %c" c)
+					 (setq c (- c ?0))
+					 (substring str
+						    (match-beginning c)
+						    (match-end c))))
+				      (t (char-to-string c))))
+			    (if (eq c ?\\) (progn (setq special t) nil)
+			      (char-to-string c))))
+			 newtext ""))))))
+(concat rtn-str (substring str start))))
+(defun split-string (string &optional pattern)
+"Return a list of substrings of STRING which are separated by PATTERN.
+If PATTERN is omitted, it defaults to \"[ \\f\\t\\n\\r\\v]+\"."
+(or pattern
+(setq pattern "[ \f\t\n\r\v]+"))
+(let (parts (start 0) (len (length string)))
+(if (string-match pattern string)
+	(setq parts (cons (substring string 0 (match-beginning 0)) parts)
+	      start (match-end 0)))
+(while (and (< start len)
+		(string-match pattern string (if (> start (match-beginning 0))
+						 start
+					       (1+ start))))
+(setq parts (cons (substring string start (match-beginning 0)) parts)
+	    start (match-end 0)))
+(nreverse (cons (substring string start) parts))))
+;; #### #### #### AAaargh!  Must be in C, because it is used insanely
+;; early in the bootstrap process.
+;(defun split-path (path)
+;  "Explode a search path into a list of strings.
+;The path components are separated with the characters specified
+;with `path-separator'."
+;  (while (or (not stringp path-separator)
+;	     (/= (length path-separator) 1))
+;    (setq path-separator (signal 'error (list "\
+;`path-separator' should be set to a single-character string"
+;					      path-separator))))
+;  (split-string-by-char path (aref separator 0)))
+(defmacro with-output-to-string (&rest forms)
+"Collect output to `standard-output' while evaluating FORMS and return
+it as a string."
+;; by "William G. Dubuque" <wgd@zurich.ai.mit.edu> w/ mods from Stig
+`(with-current-buffer (get-buffer-create " *string-output*")
+(setq buffer-read-only nil)
+(buffer-disable-undo (current-buffer))
+(erase-buffer)
+(let ((standard-output (current-buffer)))
+,@forms)
+(prog1
+	 (buffer-string)
+(erase-buffer))))
+(defmacro with-current-buffer (buffer &rest body)
+"Temporarily make BUFFER the current buffer and execute the forms in BODY.
+The value returned is the value of the last form in BODY.
+See also `with-temp-buffer'."
+`(save-current-buffer
+(set-buffer ,buffer)
+,@body))
+(defmacro with-temp-file (file &rest forms)
+"Create a new buffer, evaluate FORMS there, and write the buffer to FILE.
+The value of the last form in FORMS is returned, like `progn'.
+See also `with-temp-buffer'."
+(let ((temp-file (make-symbol "temp-file"))
+	(temp-buffer (make-symbol "temp-buffer")))
+`(let ((,temp-file ,file)
+	   (,temp-buffer
+	    (get-buffer-create (generate-new-buffer-name " *temp file*"))))
+(unwind-protect
+	   (prog1
+	       (with-current-buffer ,temp-buffer
+		 ,@forms)
+	     (with-current-buffer ,temp-buffer
+(widen)
+	       (write-region (point-min) (point-max) ,temp-file nil 0)))
+	 (and (buffer-name ,temp-buffer)
+	      (kill-buffer ,temp-buffer))))))
+(defmacro with-temp-buffer (&rest forms)
+"Create a temporary buffer, and evaluate FORMS there like `progn'.
+See also `with-temp-file' and `with-output-to-string'."
+(let ((temp-buffer (make-symbol "temp-buffer")))
+`(let ((,temp-buffer
+	    (get-buffer-create (generate-new-buffer-name " *temp*"))))
+(unwind-protect
+	   (with-current-buffer ,temp-buffer
+	     ,@forms)
+	 (and (buffer-name ,temp-buffer)
+	      (kill-buffer ,temp-buffer))))))
+;; Moved from mule-coding.el.
+(defmacro with-string-as-buffer-contents (str &rest body)
+"With the contents of the current buffer being STR, run BODY.
+Returns the new contents of the buffer, as modified by BODY.
+The original current buffer is restored afterwards."
+`(let ((tempbuf (get-buffer-create " *string-as-buffer-contents*")))
+(with-current-buffer tempbuf
+(unwind-protect
+	   (progn
+	     (buffer-disable-undo (current-buffer))
+	     (erase-buffer)
+	     (insert ,str)
+	     ,@body
+	     (buffer-string))
+	 (erase-buffer tempbuf)))))
+(defun insert-face (string face)
+"Insert STRING and highlight with FACE.  Return the extent created."
+(let ((p (point)) ext)
+(insert string)
+(setq ext (make-extent p (point)))
+(set-extent-face ext face)
+ext))
+;; not obsolete.
+(define-function 'string= 'string-equal)
+(define-function 'string< 'string-lessp)
+(define-function 'int-to-string 'number-to-string)
+(define-function 'string-to-int 'string-to-number)
+;; These two names are a bit awkward, as they conflict with the normal
+;; foo-to-bar naming scheme, but CLtL2 has them, so they stay.
+(define-function 'char-int 'char-to-int)
+(define-function 'int-char 'int-to-char)
+;; alist/plist functions
+(defun plist-to-alist (plist)
+"Convert property list PLIST into the equivalent association-list form.
+The alist is returned.  This converts from
+\(a 1 b 2 c 3)
+into
+\((a . 1) (b . 2) (c . 3))
+The original plist is not modified.  See also `destructive-plist-to-alist'."
+(let (alist)
+(while plist
+(setq alist (cons (cons (car plist) (cadr plist)) alist))
+(setq plist (cddr plist)))
+(nreverse alist)))
+(defun destructive-plist-to-alist (plist)
+"Convert property list PLIST into the equivalent association-list form.
+The alist is returned.  This converts from
+\(a 1 b 2 c 3)
+into
+\((a . 1) (b . 2) (c . 3))
+The original plist is destroyed in the process of constructing the alist.
+See also `plist-to-alist'."
+(let ((head plist)
+	next)
+(while plist
+;; remember the next plist pair.
+(setq next (cddr plist))
+;; make the cons holding the property value into the alist element.
+(setcdr (cdr plist) (cadr plist))
+(setcar (cdr plist) (car plist))
+;; reattach into alist form.
+(setcar plist (cdr plist))
+(setcdr plist next)
+(setq plist next))
+head))
+(defun alist-to-plist (alist)
+"Convert association list ALIST into the equivalent property-list form.
+The plist is returned.  This converts from
+\((a . 1) (b . 2) (c . 3))
+into
+\(a 1 b 2 c 3)
+The original alist is not modified.  See also `destructive-alist-to-plist'."
+(let (plist)
+(while alist
+(let ((el (car alist)))
+	(setq plist (cons (cdr el) (cons (car el) plist))))
+(setq alist (cdr alist)))
+(nreverse plist)))
+;; getf, remf in cl*.el.
+(defmacro putf (plist prop val)
+"Add property PROP to plist PLIST with value VAL.
+Analogous to (setq PLIST (plist-put PLIST PROP VAL))."
+`(setq ,plist (plist-put ,plist ,prop ,val)))
+(defmacro laxputf (lax-plist prop val)
+"Add property PROP to lax plist LAX-PLIST with value VAL.
+Analogous to (setq LAX-PLIST (lax-plist-put LAX-PLIST PROP VAL))."
+`(setq ,lax-plist (lax-plist-put ,lax-plist ,prop ,val)))
+(defmacro laxremf (lax-plist prop)
+"Remove property PROP from lax plist LAX-PLIST.
+Analogous to (setq LAX-PLIST (lax-plist-remprop LAX-PLIST PROP))."
+`(setq ,lax-plist (lax-plist-remprop ,lax-plist ,prop)))
+;;; Error functions
+(defun error (&rest args)
+"Signal an error, making error message by passing all args to `format'.
+This error is not continuable: you cannot continue execution after the
+error using the debugger `r' command.  See also `cerror'."
+(while t
+(apply 'cerror args)))
+(defun cerror (&rest args)
+"Like `error' but signals a continuable error."
+(signal 'error (list (apply 'format args))))
+(defmacro check-argument-type (predicate argument)
+"Check that ARGUMENT satisfies PREDICATE.
+If not, signal a continuable `wrong-type-argument' error until the
+returned value satisfies PREDICATE, and assign the returned value
+to ARGUMENT."
+`(if (not (,(eval predicate) ,argument))
+(setq ,argument
+	     (wrong-type-argument ,predicate ,argument))))
+(defun signal-error (error-symbol data)
+"Signal a non-continuable error.  Args are ERROR-SYMBOL, and associated DATA.
+An error symbol is a symbol defined using `define-error'.
+DATA should be a list.  Its elements are printed as part of the error message.
+If the signal is handled, DATA is made available to the handler.
+See also `signal', and the functions to handle errors: `condition-case'
+and `call-with-condition-handler'."
+(while t
+(signal error-symbol data)))
+(defun define-error (error-sym doc-string &optional inherits-from)
+"Define a new error, denoted by ERROR-SYM.
+DOC-STRING is an informative message explaining the error, and will be
+printed out when an unhandled error occurs.
+ERROR-SYM is a sub-error of INHERITS-FROM (which defaults to `error').
+\[`define-error' internally works by putting on ERROR-SYM an `error-message'
+property whose value is DOC-STRING, and an `error-conditions' property
+that is a list of ERROR-SYM followed by each of its super-errors, up
+to and including `error'.  You will sometimes see code that sets this up
+directly rather than calling `define-error', but you should *not* do this
+yourself.]"
+(check-argument-type 'symbolp error-sym)
+(check-argument-type 'stringp doc-string)
+(put error-sym 'error-message doc-string)
+(or inherits-from (setq inherits-from 'error))
+(let ((conds (get inherits-from 'error-conditions)))
+(or conds (signal-error 'error (list "Not an error symbol" error-sym)))
+(put error-sym 'error-conditions (cons error-sym conds))))
+;;;; Miscellanea.
+;; This is now in C.
+;(defun buffer-substring-no-properties (beg end)
+;  "Return the text from BEG to END, without text properties, as a string."
+;  (let ((string (buffer-substring beg end)))
+;    (set-text-properties 0 (length string) nil string)
+;    string))
+(defun get-buffer-window-list (&optional buffer minibuf frame)
+"Return windows currently displaying BUFFER, or nil if none.
+BUFFER defaults to the current buffer.
+See `walk-windows' for the meaning of MINIBUF and FRAME."
+(cond ((null buffer)
+	 (setq buffer (current-buffer)))
+	((not (bufferp buffer))
+	 (setq buffer (get-buffer buffer))))
+(let (windows)
+(walk-windows (lambda (window)
+		    (if (eq (window-buffer window) buffer)
+			(push window windows)))
+		  minibuf frame)
+windows))
+(defun ignore (&rest ignore)
+"Do nothing and return nil.
+This function accepts any number of arguments, but ignores them."
+(interactive)
+nil)
+(define-function 'eval-in-buffer 'with-current-buffer)
+(make-obsolete 'eval-in-buffer 'with-current-buffer)
+;;; The real defn is in abbrev.el but some early callers
+;;;  (eg lisp-mode-abbrev-table) want this before abbrev.el is loaded...
+(if (not (fboundp 'define-abbrev-table))
+(progn
+(setq abbrev-table-name-list '())
+(fset 'define-abbrev-table (function (lambda (name defs)
+;; These are fixed-up when abbrev.el loads.
+(setq abbrev-table-name-list
+(cons (cons name defs)
+abbrev-table-name-list)))))))
+;;; `functionp' has been moved into C.
+;;(defun functionp (object)
+;;  "Non-nil if OBJECT can be called as a function."
+;;  (or (and (symbolp object) (fboundp object))
+;;      (subrp object)
+;;      (compiled-function-p object)
+;;      (eq (car-safe object) 'lambda)))
+(defun function-interactive (function)
+"Return the interactive specification of FUNCTION.
+FUNCTION can be any funcallable object.
+The specification will be returned as the list of the symbol `interactive'
+and the specs.
+If FUNCTION is not interactive, nil will be returned."
+(setq function (indirect-function function))
+(cond ((compiled-function-p function)
+	 (compiled-function-interactive function))
+	((subrp function)
+	 (subr-interactive function))
+	((eq (car-safe function) 'lambda)
+	 (let ((spec (if (stringp (nth 2 function))
+			 (nth 3 function)
+		       (nth 2 function))))
+	   (and (eq (car-safe spec) 'interactive)
+		spec)))
+	(t
+	 (error "Non-funcallable object: %s" function))))
+;; This function used to be an alias to `buffer-substring', except
+;; that FSF Emacs 20.4 added a BUFFER argument in an incompatible way.
+;; The new FSF's semantics makes more sense, but we try to support
+;; both for backward compatibility.
+(defun buffer-string (&optional buffer old-end old-buffer)
+"Return the contents of the current buffer as a string.
+If narrowing is in effect, this function returns only the visible part
+of the buffer.
+If BUFFER is specified, the contents of that buffer are returned.
+The arguments OLD-END and OLD-BUFFER are supported for backward
+compatibility with pre-21.2 XEmacsen times when arguments to this
+function were (buffer-string &optional START END BUFFER)."
+(cond
+((or (stringp buffer) (bufferp buffer))
+;; Most definitely the new way.
+(buffer-substring nil nil buffer))
+((or (stringp old-buffer) (bufferp old-buffer)
+	(natnump buffer) (natnump old-end))
+;; Definitely the old way.
+(buffer-substring buffer old-end old-buffer))
+(t
+;; Probably the old way.
+(buffer-substring buffer old-end old-buffer))))
+;; This was not present before.  I think Jamie had some objections
+;; to this, so I'm leaving this undefined for now. --ben
+;;; The objection is this: there is more than one way to load the same file.
+;;; "foo", "foo.elc", "foo.el", and "/some/path/foo.elc" are all different
+;;; ways to load the exact same code.  `eval-after-load' is too stupid to
+;;; deal with this sort of thing.  If this sort of feature is desired, then
+;;; it should work off of a hook on `provide'.  Features are unique and
+;;; the arguments to (load) are not.  --Stig
+;; We provide this for FSFmacs compatibility, at least until we devise
+;; something better.
+;;;; Specifying things to do after certain files are loaded.
+(defun eval-after-load (file form)
+"Arrange that, if FILE is ever loaded, FORM will be run at that time.
+This makes or adds to an entry on `after-load-alist'.
+If FILE is already loaded, evaluate FORM right now.
+It does nothing if FORM is already on the list for FILE.
+FILE should be the name of a library, with no directory name."
+;; Make sure there is an element for FILE.
+(or (assoc file after-load-alist)
+(setq after-load-alist (cons (list file) after-load-alist)))
+;; Add FORM to the element if it isn't there.
+(let ((elt (assoc file after-load-alist)))
+(or (member form (cdr elt))
+	(progn
+	  (nconc elt (list form))
+	  ;; If the file has been loaded already, run FORM right away.
+	  (and (assoc file load-history)
+	       (eval form)))))
+form)
+(make-compatible 'eval-after-load "")
+(defun eval-next-after-load (file)
+"Read the following input sexp, and run it whenever FILE is loaded.
+This makes or adds to an entry on `after-load-alist'.
+FILE should be the name of a library, with no directory name."
+(eval-after-load file (read)))
+(make-compatible 'eval-next-after-load "")
+; alternate names (not obsolete)
+(if (not (fboundp 'mod)) (define-function 'mod '%))
+(define-function 'move-marker 'set-marker)
+(define-function 'beep 'ding)  ; preserve lingual purity
+(define-function 'indent-to-column 'indent-to)
+(define-function 'backward-delete-char 'delete-backward-char)
+(define-function 'search-forward-regexp (symbol-function 're-search-forward))
+(define-function 'search-backward-regexp (symbol-function 're-search-backward))
+(define-function 'remove-directory 'delete-directory)
+(define-function 'set-match-data 'store-match-data)
+(define-function 'send-string-to-terminal 'external-debugging-output)
+;;; subr.el ends here

Mercurial > hg > xemacs-beta

comparison lisp/subr.el @ 428:3ecd8885ac67 r21-2-22