;;; subr.el --- basic lisp subroutines for Emacs
-;;; Copyright (C) 1985, 1986, 1992 Free Software Foundation, Inc.
+;;; Copyright (C) 1985, 1986, 1992, 1994 Free Software Foundation, Inc.
;; This file is part of GNU Emacs.
;;; Code:
-(defun one-window-p (&optional nomini)
+\f
+;;;; 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, etcetera.
+ARGS should take the same form as an argument list for a `defun'.
+DOCSTRING should be a string, as described for `defun'. It may be omitted.
+INTERACTIVE should be a call to the function `interactive', which see.
+It may also be omitted.
+BODY should be a list of lisp expressions."
+ ;; Note that this definition should not use backquotes; subr.el should not
+ ;; depend on backquote.el.
+ (list 'function (cons 'lambda cdr)))
+
+;;(defmacro defun-inline (name args &rest body)
+;; "Create an \"inline defun\" (actually a macro).
+;;Use just like `defun'."
+;; (nconc (list 'defmacro name '(&rest args))
+;; (if (stringp (car body))
+;; (prog1 (list (car body))
+;; (setq body (or (cdr body) body))))
+;; (list (list 'cons (list 'quote
+;; (cons 'lambda (cons args body)))
+;; 'args))))
+
+\f
+;;;; Window tree functions.
+
+(defun one-window-p (&optional nomini all-frames)
"Returns non-nil if there is only one window.
Optional arg NOMINI non-nil means don't count the minibuffer
-even if it is active."
+even if it is active.
+
+The optional arg ALL-FRAMES t means count windows on all frames.
+If it is `visible', count windows on all visible frames.
+ALL-FRAMES nil or omitted means count only the selected frame,
+plus the minibuffer it uses (which may be on another frame).
+If ALL-FRAMES is neither nil nor t, count only the selected frame."
(let ((base-window (selected-window)))
(if (and nomini (eq base-window (minibuffer-window)))
(setq base-window (next-window base-window)))
(eq base-window
- (next-window base-window (if nomini 'arg)))))
+ (next-window base-window (if nomini 'arg) all-frames))))
(defun walk-windows (proc &optional minibuf all-frames)
"Cycle through all visible windows, calling PROC for each one.
Optional second arg MINIBUF t means count the minibuffer window
even if not active. If MINIBUF is neither t nor nil it means
not to count the minibuffer even if it is active.
-Optional third arg ALL-FRAMES t means include all windows in all frames;
-otherwise cycle within the selected frame."
+
+Optional third arg ALL-FRAMES, if t, means include all frames.
+ALL-FRAMES nil or omitted means cycle within the selected frame,
+but include the minibuffer window (if MINIBUF says so) that that
+frame uses, even if it is on another frame.
+If ALL-FRAMES is neither nil nor t, stick strictly to the selected frame."
+ ;; If we start from the minibuffer window, don't fail to come back to it.
+ (if (window-minibuffer-p (selected-window))
+ (setq minibuf t))
(let* ((walk-windows-start (selected-window))
(walk-windows-current walk-windows-start))
(while (progn
(funcall proc walk-windows-current)
(not (eq walk-windows-current walk-windows-start))))))
-(defun read-quoted-char (&optional prompt)
- "Like `read-char', except that if the first character read is an octal
-digit, we read up to two more octal digits and return the character
-represented by the octal number consisting of those digits.
-Optional argument PROMPT specifies a string to use to prompt the user."
- (let ((count 0) (code 0) char)
- (while (< count 3)
- (let ((inhibit-quit (zerop count))
- (help-form nil))
- (and prompt (message "%s-" prompt))
- (setq char (read-char))
- (if inhibit-quit (setq quit-flag nil)))
- (cond ((null char))
- ((and (<= ?0 char) (<= char ?7))
- (setq code (+ (* code 8) (- char ?0))
- count (1+ count))
- (and prompt (message (setq prompt
- (format "%s %c" prompt char)))))
- ((> count 0)
- (setq unread-command-events (list char) count 259))
- (t (setq code char count 259))))
- (logand 255 code)))
-
-(defun error (&rest args)
- "Signal an error, making error message by passing all args to `format'."
- (while t
- (signal 'error (list (apply 'format args)))))
+(defun minibuffer-window-active-p (window)
+ "Return t if WINDOW (a minibuffer window) is now active."
+ ;; nil nil means include WINDOW's frame
+ ;; and other frames using WINDOW as minibuffer,
+ ;; and include minibuffer if active.
+ (let ((prev (previous-window window nil nil)))
+ ;; If PREV equals WINDOW, WINDOW must be on a minibuffer-only frame
+ ;; and it's not currently being used. So return nil.
+ (and (not (eq window prev))
+ (let ((should-be-same (next-window prev nil nil)))
+ ;; If next-window doesn't reverse previous-window,
+ ;; WINDOW must be outside the cycle specified by nil nil.
+ (eq should-be-same window)))))
+\f
+;;;; Keymap support.
(defun undefined ()
(interactive)
(ding))
-;; Some programs still use this as a function.
-(defun baud-rate ()
- "Obsolete function returning the value of the `baud-rate' variable."
- baud-rate)
-
;Prevent the \{...} documentation construct
;from mentioning keys that run this command.
(put 'undefined 'suppress-keymap t)
"Make MAP override all normally self-inserting keys to be undefined.
Normally, as an exception, digits and minus-sign are set to make prefix args,
but optional second arg NODIGITS non-nil treats them like other chars."
- (let ((i 0))
- (while (<= i 127)
- (if (eql (lookup-key global-map (char-to-string i)) 'self-insert-command)
- (define-key map (char-to-string i) 'undefined))
- (setq i (1+ i))))
+ (substitute-key-definition 'self-insert-command 'undefined map global-map)
(or nodigits
(let (loop)
(define-key map "-" 'negative-argument)
(define-key map (char-to-string loop) 'digit-argument)
(setq loop (1+ loop))))))
-;; now in fns.c
-;(defun nth (n list)
-; "Returns the Nth element of LIST.
-;N counts from zero. If LIST is not that long, nil is returned."
-; (car (nthcdr n list)))
-;
-;(defun copy-alist (alist)
-; "Return a copy of ALIST.
-;This is a new alist which represents the same mapping
-;from objects to objects, but does not share the alist structure with ALIST.
-;The objects mapped (cars and cdrs of elements of the alist)
-;are shared, however."
-; (setq alist (copy-sequence alist))
-; (let ((tail alist))
-; (while tail
-; (if (consp (car tail))
-; (setcar tail (cons (car (car tail)) (cdr (car tail)))))
-; (setq tail (cdr tail))))
-; alist)
-
;Moved to keymap.c
;(defun copy-keymap (keymap)
; "Return a copy of KEYMAP"
; (copy-sequence keymap)
; (copy-alist keymap)))
+(defvar key-substitution-in-progress nil
+ "Used internally by substitute-key-definition.")
+
(defun substitute-key-definition (olddef newdef keymap &optional oldmap prefix)
"Replace OLDDEF with NEWDEF for any keys in KEYMAP now defined as OLDDEF.
In other words, OLDDEF is replaced with NEWDEF where ever it appears.
(or prefix (setq prefix ""))
(let* ((scan (or oldmap keymap))
(vec1 (vector nil))
- (prefix1 (vconcat prefix vec1)))
+ (prefix1 (vconcat prefix vec1))
+ (key-substitution-in-progress
+ (cons scan key-substitution-in-progress)))
;; Scan OLDMAP, finding each char or event-symbol that
;; has any definition, and act on it with hack-key.
(while (consp scan)
;; the inside of the following let that handles array elements.
(aset vec1 0 char)
(aset prefix1 (length prefix) char)
- (let (inner-def)
+ (let (inner-def skipped)
;; Skip past menu-prompt.
(while (stringp (car-safe defn))
+ (setq skipped (cons (car defn) skipped))
(setq defn (cdr defn)))
(setq inner-def defn)
(while (and (symbolp inner-def)
(fboundp inner-def))
(setq inner-def (symbol-function inner-def)))
(if (eq defn olddef)
- (define-key keymap prefix1 newdef)
- (if (keymapp defn)
+ (define-key keymap prefix1 (nconc (nreverse skipped) newdef))
+ (if (and (keymapp defn)
+ (not (memq inner-def
+ key-substitution-in-progress)))
(substitute-key-definition olddef newdef keymap
inner-def
prefix1)))))
;; the inside of the previous let.
(aset vec1 0 char)
(aset prefix1 (length prefix) char)
- (let (inner-def)
+ (let (inner-def skipped)
;; Skip past menu-prompt.
(while (stringp (car-safe defn))
+ (setq skipped (cons (car defn) skipped))
(setq defn (cdr defn)))
(setq inner-def defn)
(while (and (symbolp inner-def)
(fboundp inner-def))
(setq inner-def (symbol-function inner-def)))
(if (eq defn olddef)
- (define-key keymap prefix1 newdef)
- (if (keymapp defn)
+ (define-key keymap prefix1
+ (nconc (nreverse skipped) newdef))
+ (if (and (keymapp defn)
+ (not (memq inner-def
+ key-substitution-in-progress)))
(substitute-key-definition olddef newdef keymap
inner-def
prefix1)))))
(setq i (1+ i))))))
(setq scan (cdr scan)))))
-(defmacro save-match-data (&rest body)
- "Execute the BODY forms, restoring the global value of the match data."
- (let ((original (make-symbol "match-data")))
- (list
- 'let (list (list original '(match-data)))
- (list 'unwind-protect
- (cons 'progn body)
- (list 'store-match-data original)))))
+(defun define-key-after (keymap key definition after)
+ "Add binding in KEYMAP for KEY => DEFINITION, right after AFTER's binding.
+This is like `define-key' except that the binding for KEY is placed
+just after the binding for the event AFTER, instead of at the beginning
+of the map.
+The order matters when the keymap is used as a menu.
+KEY must contain just one event type--that is to say, it must be
+a string or vector of length 1."
+ (or (keymapp keymap)
+ (signal 'wrong-type-argument (list 'keymapp keymap)))
+ (if (> (length key) 1)
+ (error "multi-event key specified in `define-key-after'"))
+ (let ((tail keymap) done inserted
+ (first (aref key 0)))
+ (while (and (not done) tail)
+ ;; Delete any earlier bindings for the same key.
+ (if (eq (car-safe (car (cdr tail))) first)
+ (setcdr tail (cdr (cdr tail))))
+ ;; When we reach AFTER's binding, insert the new binding after.
+ ;; If we reach an inherited keymap, insert just before that.
+ ;; If we reach the end of this keymap, insert at the end.
+ (if (or (eq (car-safe (car tail)) after)
+ (eq (car (cdr tail)) 'keymap)
+ (null (cdr tail)))
+ (progn
+ ;; Stop the scan only if we find a parent keymap.
+ ;; Keep going past the inserted element
+ ;; so we can delete any duplications that come later.
+ (if (eq (car (cdr tail)) 'keymap)
+ (setq done t))
+ ;; Don't insert more than once.
+ (or inserted
+ (setcdr tail (cons (cons (aref key 0) definition) (cdr tail))))
+ (setq inserted t)))
+ (setq tail (cdr tail)))))
+
+(defun keyboard-translate (from to)
+ "Translate character FROM to TO at a low level.
+This function creates a `keyboard-translate-table' if necessary
+and then modifies one entry in it."
+ (or (arrayp keyboard-translate-table)
+ (setq keyboard-translate-table ""))
+ (if (or (> from (length keyboard-translate-table))
+ (> to (length keyboard-translate-table)))
+ (progn
+ (let* ((i (length keyboard-translate-table))
+ (table (concat keyboard-translate-table
+ (make-string (- 256 i) 0))))
+ (while (< i 256)
+ (aset table i i)
+ (setq i (1+ i)))
+ (setq keyboard-translate-table table))))
+ (aset keyboard-translate-table from to))
-(defun ignore (&rest ignore)
- "Do nothing.
-Accept any number of arguments, but ignore them."
- nil)
-\f
-; old names
-(fset 'make-syntax-table 'copy-syntax-table)
-(fset 'dot 'point)
-(fset 'dot-marker 'point-marker)
-(fset 'dot-min 'point-min)
-(fset 'dot-max 'point-max)
-(fset 'window-dot 'window-point)
-(fset 'set-window-dot 'set-window-point)
-(fset 'read-input 'read-string)
-(fset 'send-string 'process-send-string)
-(fset 'send-region 'process-send-region)
-(fset 'show-buffer 'set-window-buffer)
-(fset 'buffer-flush-undo 'buffer-disable-undo)
-(fset 'eval-current-buffer 'eval-buffer)
-(fset 'compiled-function-p 'byte-code-function-p)
-
-; alternate names
-(fset 'string= 'string-equal)
-(fset 'string< 'string-lessp)
-(fset 'move-marker 'set-marker)
-(fset 'eql 'eq)
-(fset 'not 'null)
-(fset 'rplaca 'setcar)
-(fset 'rplacd 'setcdr)
-(fset 'beep 'ding) ;preserve lingual purtity
-(fset 'indent-to-column 'indent-to)
-(fset 'backward-delete-char 'delete-backward-char)
-(fset 'search-forward-regexp (symbol-function 're-search-forward))
-(fset 'search-backward-regexp (symbol-function 're-search-backward))
\f
-;;; global-map, esc-map, and ctl-x-map have their values set up
-;;; in keymap.c.
+;;;; 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.
+
(defvar global-map nil
"Default global keymap mapping Emacs keyboard input into commands.
The value is a keymap which is usually (but not necessarily) Emacs's
(defvar ctl-x-4-map (make-sparse-keymap)
"Keymap for subcommands of C-x 4")
-(fset 'ctl-x-4-prefix ctl-x-4-map)
+(defalias 'ctl-x-4-prefix ctl-x-4-map)
(define-key ctl-x-map "4" 'ctl-x-4-prefix)
(defvar ctl-x-5-map (make-sparse-keymap)
"Keymap for frame commands.")
-(fset 'ctl-x-5-prefix ctl-x-5-map)
+(defalias 'ctl-x-5-prefix ctl-x-5-map)
(define-key ctl-x-map "5" 'ctl-x-5-prefix)
\f
+;;;; Event manipulation functions.
+
+;; This code exists specifically to make sure that the
+;; resulting number does not appear in the .elc file.
+;; The number is negative on most machines, but not on all!
+(defconst listify-key-sequence-1
+ (lsh 1 7))
+(setq listify-key-sequence-1 (logior (lsh 1 23) listify-key-sequence-1))
+
+(defun listify-key-sequence (key)
+ "Convert a key sequence to a list of events."
+ (if (vectorp key)
+ (append key nil)
+ (mapcar (function (lambda (c)
+ (if (> c 127)
+ (logxor c listify-key-sequence-1)
+ c)))
+ (append key nil))))
+
+(defsubst eventp (obj)
+ "True if the argument is an event object."
+ (or (integerp obj)
+ (and (symbolp obj)
+ (get obj 'event-symbol-elements))
+ (and (consp obj)
+ (symbolp (car obj))
+ (get (car obj) 'event-symbol-elements))))
+
+(defun event-modifiers (event)
+ "Returns a list of symbols representing the modifier keys in event EVENT.
+The elements of the list may include `meta', `control',
+`shift', `hyper', `super', `alt', `click', `double', `triple', `drag',
+and `down'."
+ (let ((type event))
+ (if (listp type)
+ (setq type (car type)))
+ (if (symbolp type)
+ (cdr (get type 'event-symbol-elements))
+ (let ((list nil))
+ (or (zerop (logand type (lsh 1 23)))
+ (setq list (cons 'meta list)))
+ (or (and (zerop (logand type (lsh 1 22)))
+ (>= (logand type 127) 32))
+ (setq list (cons 'control list)))
+ (or (and (zerop (logand type (lsh 1 21)))
+ (= (logand type 255) (downcase (logand type 255))))
+ (setq list (cons 'shift list)))
+ (or (zerop (logand type (lsh 1 20)))
+ (setq list (cons 'hyper list)))
+ (or (zerop (logand type (lsh 1 19)))
+ (setq list (cons 'super list)))
+ (or (zerop (logand type (lsh 1 18)))
+ (setq list (cons 'alt list)))
+ list))))
+
+(defun event-basic-type (event)
+ "Returns the basic type of the given event (all modifiers removed).
+The value is an ASCII printing character (not upper case) or a symbol."
+ (if (consp event)
+ (setq event (car event)))
+ (if (symbolp event)
+ (car (get event 'event-symbol-elements))
+ (let ((base (logand event (1- (lsh 1 18)))))
+ (downcase (if (< base 32) (logior base 64) base)))))
+
+(defsubst mouse-movement-p (object)
+ "Return non-nil if OBJECT is a mouse movement event."
+ (and (consp object)
+ (eq (car object) 'mouse-movement)))
+
+(defsubst event-start (event)
+ "Return the starting position of EVENT.
+If EVENT is a mouse press or a mouse click, this returns the location
+of the event.
+If EVENT is a drag, this returns the drag's starting position.
+The return value is of the form
+ (WINDOW BUFFER-POSITION (X . Y) TIMESTAMP)
+The `posn-' functions access elements of such lists."
+ (nth 1 event))
+
+(defsubst event-end (event)
+ "Return the ending location of EVENT. EVENT should be a click or drag event.
+If EVENT is a click event, this function is the same as `event-start'.
+The return value is of the form
+ (WINDOW BUFFER-POSITION (X . Y) TIMESTAMP)
+The `posn-' functions access elements of such lists."
+ (nth (if (consp (nth 2 event)) 2 1) event))
+
+(defsubst event-click-count (event)
+ "Return the multi-click count of EVENT, a click or drag event.
+The return value is a positive integer."
+ (if (integerp (nth 2 event)) (nth 2 event) 1))
+
+(defsubst posn-window (position)
+ "Return the window in POSITION.
+POSITION should be a list of the form
+ (WINDOW BUFFER-POSITION (X . Y) TIMESTAMP)
+as returned by the `event-start' and `event-end' functions."
+ (nth 0 position))
+
+(defsubst posn-point (position)
+ "Return the buffer location in POSITION.
+POSITION should be a list of the form
+ (WINDOW BUFFER-POSITION (X . Y) TIMESTAMP)
+as returned by the `event-start' and `event-end' functions."
+ (if (consp (nth 1 position))
+ (car (nth 1 position))
+ (nth 1 position)))
+
+(defsubst posn-x-y (position)
+ "Return the x and y coordinates in POSITION.
+POSITION should be a list of the form
+ (WINDOW BUFFER-POSITION (X . Y) TIMESTAMP)
+as returned by the `event-start' and `event-end' functions."
+ (nth 2 position))
+
+(defsubst posn-col-row (position)
+ "Return the column and row in POSITION, measured in characters.
+POSITION should be a list of the form
+ (WINDOW BUFFER-POSITION (X . Y) TIMESTAMP)
+as returned by the `event-start' and `event-end' functions."
+ (let* ((pair (nth 2 position))
+ (window (posn-window position))
+ (frame (if (framep window) window (window-frame window)))
+ (x (/ (car pair) (frame-char-width frame)))
+ (y (/ (cdr pair) (frame-char-height frame))))
+ (cons x y)))
+
+(defsubst posn-timestamp (position)
+ "Return the timestamp of POSITION.
+POSITION should be a list of the form
+ (WINDOW BUFFER-POSITION (X . Y) TIMESTAMP)
+as returned by the `event-start' and `event-end' functions."
+ (nth 3 position))
+
+\f
+;;;; Obsolescent names for functions.
+
+(defalias 'dot 'point)
+(defalias 'dot-marker 'point-marker)
+(defalias 'dot-min 'point-min)
+(defalias 'dot-max 'point-max)
+(defalias 'window-dot 'window-point)
+(defalias 'set-window-dot 'set-window-point)
+(defalias 'read-input 'read-string)
+(defalias 'send-string 'process-send-string)
+(defalias 'send-region 'process-send-region)
+(defalias 'show-buffer 'set-window-buffer)
+(defalias 'buffer-flush-undo 'buffer-disable-undo)
+(defalias 'eval-current-buffer 'eval-buffer)
+(defalias 'compiled-function-p 'byte-code-function-p)
+
+;; Some programs still use this as a function.
+(defun baud-rate ()
+ "Obsolete function returning the value of the `baud-rate' variable.
+Please convert your programs to use the variable `baud-rate' directly."
+ baud-rate)
+
+\f
+;;;; Alternate names for functions - these are not being phased out.
+
+(defalias 'string= 'string-equal)
+(defalias 'string< 'string-lessp)
+(defalias 'move-marker 'set-marker)
+(defalias 'eql 'eq)
+(defalias 'not 'null)
+(defalias 'rplaca 'setcar)
+(defalias 'rplacd 'setcdr)
+(defalias 'beep 'ding) ;preserve lingual purity
+(defalias 'indent-to-column 'indent-to)
+(defalias 'backward-delete-char 'delete-backward-char)
+(defalias 'search-forward-regexp (symbol-function 're-search-forward))
+(defalias 'search-backward-regexp (symbol-function 're-search-backward))
+(defalias 'int-to-string 'number-to-string)
+(defalias 'set-match-data 'store-match-data)
+
+;;; Should this be an obsolete name? If you decide it should, you get
+;;; to go through all the sources and change them.
+(defalias 'string-to-int 'string-to-number)
+\f
+;;;; Hook manipulation functions.
+
(defun run-hooks (&rest hooklist)
"Takes hook names and runs each one in turn. Major mode functions use this.
Each argument should be a symbol, a hook variable.
(symbol-value sym)
(let ((value (symbol-value sym)))
(if (and (listp value) (not (eq (car value) 'lambda)))
- (mapcar 'funcall value)
+ (let ((functions value))
+ (while value
+ (funcall (car value))
+ (setq value (cdr value))))
(funcall value)))))
(setq hooklist (cdr hooklist))))
+(defun run-hook-with-args (hook &rest args)
+ "Run HOOK with the specified arguments ARGS.
+HOOK should be a symbol, a hook variable. If HOOK has a non-nil
+value, that value may be a function or a list of functions to be
+called to run the hook. If the value is a function, it is called with
+the given arguments and its return value is returned. If it is a list
+of functions, those functions are called, in order,
+with the given arguments ARGS.
+It is best not to depend on the value return by `run-hook-with-args',
+as that may change."
+ (and (boundp hook)
+ (symbol-value hook)
+ (let ((value (symbol-value hook)))
+ (if (and (listp value) (not (eq (car value) 'lambda)))
+ (mapcar '(lambda (foo) (apply foo args))
+ value)
+ (apply value args)))))
+
;; Tell C code how to call this function.
(defconst run-hooks 'run-hooks
"Variable by which C primitives find the function `run-hooks'.
Don't change it.")
-(defun add-hook (hook function)
- "Add to the value of HOOK the function FUNCTION unless already present.
-HOOK should be a symbol, and FUNCTION may be any valid function.
-HOOK's value should be a list of functions, not a single function.
-If HOOK is void, it is first set to nil."
+(defun add-hook (hook function &optional append)
+ "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.
+
+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))
+ ;; 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))))
(or (if (consp function)
- ;; Clever way to tell whether a given lambda-expression
- ;; is equal to anything in the hook.
- (let ((tail (assoc (cdr function) (symbol-value hook))))
- (equal function tail))
+ (member function (symbol-value hook))
(memq function (symbol-value hook)))
- (set hook (cons function (symbol-value hook)))))
+ (set hook
+ (if append
+ (nconc (symbol-value hook) (list function))
+ (cons function (symbol-value hook))))))
+
+(defun remove-hook (hook function)
+ "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'."
+ (if (or (not (boundp hook)) ;unbound symbol, or
+ (null (symbol-value hook)) ;value is nil, or
+ (null function)) ;function is nil, then
+ nil ;Do nothing.
+ (let ((hook-value (symbol-value hook)))
+ (if (consp hook-value)
+ (setq hook-value (delete function hook-value))
+ (if (equal hook-value function)
+ (setq hook-value nil)))
+ (set hook hook-value))))
\f
+;;;; 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'.
+It does nothing if FORM is already on the list for FILE.
+FILE should be the name of a library, with no directory name."
+ (or (assoc file after-load-alist)
+ (setq after-load-alist (cons (list file) after-load-alist)))
+ (let ((elt (assoc file after-load-alist)))
+ (or (member form (cdr elt))
+ (nconc elt (list form))))
+ form)
+
+(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)))
+
+\f
+;;;; Input and display facilities.
+
+(defun read-quoted-char (&optional prompt)
+ "Like `read-char', except that if the first character read is an octal
+digit, we read up to two more octal digits and return the character
+represented by the octal number consisting of those digits.
+Optional argument PROMPT specifies a string to use to prompt the user."
+ (let ((count 0) (code 0) char)
+ (while (< count 3)
+ (let ((inhibit-quit (zerop count))
+ (help-form nil))
+ (and prompt (message "%s-" prompt))
+ (setq char (read-char))
+ (if inhibit-quit (setq quit-flag nil)))
+ (cond ((null char))
+ ((and (<= ?0 char) (<= char ?7))
+ (setq code (+ (* code 8) (- char ?0))
+ count (1+ count))
+ (and prompt (message (setq prompt
+ (format "%s %c" prompt char)))))
+ ((> count 0)
+ (setq unread-command-events (list char) count 259))
+ (t (setq code char count 259))))
+ ;; Turn a meta-character into a character with the 0200 bit set.
+ (logior (if (/= (logand code (lsh 1 23)) 0) 128 0)
+ (logand 255 code))))
+
+(defun force-mode-line-update (&optional all)
+ "Force the mode-line of the current buffer to be redisplayed.
+With optional non-nil ALL, force redisplay of all mode-lines."
+ (if all (save-excursion (set-buffer (other-buffer))))
+ (set-buffer-modified-p (buffer-modified-p)))
+
(defun momentary-string-display (string pos &optional exit-char message)
"Momentarily display STRING in the buffer at POS.
Display remains until next character is typed.
If MESSAGE is nil, instructions to type EXIT-CHAR are displayed there."
(or exit-char (setq exit-char ?\ ))
(let ((buffer-read-only nil)
+ ;; Don't modify the undo list at all.
+ (buffer-undo-list t)
(modified (buffer-modified-p))
(name buffer-file-name)
insert-end)
;; defeat file locking... don't try this at home, kids!
(setq buffer-file-name nil)
(insert-before-markers string)
- (setq insert-end (point)))
+ (setq insert-end (point))
+ ;; If the message end is off screen, recenter now.
+ (if (> (window-end) insert-end)
+ (recenter (/ (window-height) 2)))
+ ;; If that pushed message start off the screen,
+ ;; scroll to start it at the top of the screen.
+ (move-to-window-line 0)
+ (if (> (point) pos)
+ (progn
+ (goto-char pos)
+ (recenter 0))))
(message (or message "Type %s to continue editing.")
(single-key-description exit-char))
- (let ((char (read-char)))
+ (let ((char (read-event)))
(or (eq char exit-char)
(setq unread-command-events (list char)))))
(if insert-end
(setq buffer-file-name name)
(set-buffer-modified-p modified))))
+\f
+;;;; Miscellanea.
+
+(defun ignore (&rest ignore)
+ (interactive)
+ "Do nothing.
+Accept any number of arguments, but ignore them."
+ nil)
+
+(defun error (&rest args)
+ "Signal an error, making error message by passing all args to `format'."
+ (while t
+ (signal 'error (list (apply 'format args)))))
+
+(defalias 'user-original-login-name 'user-login-name)
+
(defun start-process-shell-command (name buffer &rest args)
"Start a program in a subprocess. Return the process object for it.
Args are NAME BUFFER COMMAND &rest COMMAND-ARGS.
with any buffer
Third arg is command name, the name of a shell command.
Remaining arguments are the arguments for the command.
-Wildcards and redirection are handle as usual in the shell."
+Wildcards and redirection are handled as usual in the shell."
(if (eq system-type 'vax-vms)
(apply 'start-process name buffer args)
(start-process name buffer shell-file-name "-c"
(concat "exec " (mapconcat 'identity args " ")))))
-\f
-(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'.
-FILE should be the name of a library, with no directory name."
- (or (assoc file after-load-alist)
- (setq after-load-alist (cons (list file) after-load-alist)))
- (nconc (assoc file after-load-alist) (list form))
- form)
-(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)))
-
-;;(defmacro defun-inline (name args &rest body)
-;; "Create an \"inline defun\" (actually a macro).
-;;Use just like `defun'."
-;; (nconc (list 'defmacro name '(&rest args))
-;; (if (stringp (car body))
-;; (prog1 (list (car body))
-;; (setq body (or (cdr body) body))))
-;; (list (list 'cons (list 'quote
-;; (cons 'lambda (cons args body)))
-;; 'args))))
-\f
-(defun user-original-login-name ()
- "Return user's login name from original login.
-This tries to remain unaffected by `su', by looking in environment variables."
- (or (getenv "LOGNAME") (getenv "USER") (user-login-name)))
-\f
-(defun force-mode-line-update (&optional all)
- "Force the mode-line of the current buffer to be redisplayed.
-With optional non-nil ALL then force then force redisplay of all mode-lines."
- (if all (save-excursion (set-buffer (other-buffer))))
- (set-buffer-modified-p (buffer-modified-p)))
+(defmacro save-match-data (&rest body)
+ "Execute the BODY forms, restoring the global value of the match data."
+ (let ((original (make-symbol "match-data")))
+ (list
+ 'let (list (list original '(match-data)))
+ (list 'unwind-protect
+ (cons 'progn body)
+ (list 'store-match-data original)))))
-(defun keyboard-translate (from to)
- "Translate character FROM to TO at a low level.
-This function creates a `keyboard-translate-table' if necessary
-and then modifies one entry in it."
- (or (arrayp keyboard-translate-table)
- (setq keyboard-translate-table ""))
- (if (or (> from (length keyboard-translate-table))
- (> to (length keyboard-translate-table)))
- (progn
- (let* ((i (length keyboard-translate-table))
- (table (make-string (- 256 i) 0)))
- (while (< i 256)
- (aset table i i)
- (setq i (1+ i)))
- (setq keyboard-translate-table table))))
- (aset keyboard-translate-table from to))
+(defun shell-quote-argument (argument)
+ "Quote an argument for passing as argument to an inferior shell."
+ ;; Quote everything except POSIX filename characters.
+ ;; This should be safe enough even for really weird shells.
+ (let ((result "") (start 0) end)
+ (while (string-match "[^-0-9a-zA-Z_./]" argument start)
+ (setq end (match-beginning 0)
+ result (concat result (substring argument start end)
+ "\\" (substring argument end (1+ end)))
+ start (1+ end)))
+ (concat result (substring argument start))))
+
+(defun make-syntax-table (&optional oldtable)
+ "Return a new syntax table.
+It inherits all letters and control characters from the standard
+syntax table; other characters are copied from the standard syntax table."
+ (if oldtable
+ (copy-syntax-table oldtable)
+ (let ((table (copy-syntax-table))
+ i)
+ (setq i 0)
+ (while (<= i 31)
+ (aset table i 13)
+ (setq i (1+ i)))
+ (setq i ?A)
+ (while (<= i ?Z)
+ (aset table i 13)
+ (setq i (1+ i)))
+ (setq i ?a)
+ (while (<= i ?z)
+ (aset table i 13)
+ (setq i (1+ i)))
+ (setq i 128)
+ (while (<= i 255)
+ (aset table i 13)
+ (setq i (1+ i)))
+ table)))
-\f
-(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, etcetera.
-ARGS should take the same form as an argument list for a `defun'.
-DOCSTRING should be a string, as described for `defun'. It may be omitted.
-INTERACTIVE should be a call to the function `interactive', which see.
-It may also be omitted.
-BODY should be a list of lisp expressions."
- ;; Note that this definition should not use backquotes; subr.el should not
- ;; depend on backquote.el.
- (list 'function (cons 'lambda cdr)))
+;; now in fns.c
+;(defun nth (n list)
+; "Returns the Nth element of LIST.
+;N counts from zero. If LIST is not that long, nil is returned."
+; (car (nthcdr n list)))
+;
+;(defun copy-alist (alist)
+; "Return a copy of ALIST.
+;This is a new alist which represents the same mapping
+;from objects to objects, but does not share the alist structure with ALIST.
+;The objects mapped (cars and cdrs of elements of the alist)
+;are shared, however."
+; (setq alist (copy-sequence alist))
+; (let ((tail alist))
+; (while tail
+; (if (consp (car tail))
+; (setcar tail (cons (car (car tail)) (cdr (car tail)))))
+; (setq tail (cdr tail))))
+; alist)
;;; subr.el ends here
+
HCoop / bpt / emacs.git / blobdiff