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Text File | 1998-05-21 | 45.8 KB | 1,344 lines |
- ;;; viper-util.el --- Utilities used by viper.el
-
- ;; Copyright (C) 1994, 1995, 1996, 1997 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, Inc., 59 Temple Place - Suite 330,
- ;; Boston, MA 02111-1307, USA.
-
-
- ;; Code
-
- ;; Compiler pacifier
- (defvar viper-overriding-map)
- (defvar pm-color-alist)
- (defvar zmacs-region-stays)
- (defvar viper-minibuffer-current-face)
- (defvar viper-minibuffer-insert-face)
- (defvar viper-minibuffer-vi-face)
- (defvar viper-minibuffer-emacs-face)
- (defvar viper-replace-overlay-face)
- (defvar viper-fast-keyseq-timeout)
- (defvar ex-unix-type-shell)
- (defvar ex-unix-type-shell-options)
- (defvar viper-ex-tmp-buf-name)
- (defvar viper-syntax-preference)
-
- (require 'cl)
- (require 'ring)
-
- (if noninteractive
- (eval-when-compile
- (let ((load-path (cons (expand-file-name ".") load-path)))
- (or (featurep 'viper-init)
- (load "viper-init.el" nil nil 'nosuffix))
- )))
- ;; end pacifier
-
- (require 'viper-init)
-
-
- ;; A fix for NeXT Step
- ;; Should go away, when NS people fix the design flaw, which leaves the
- ;; two x-* functions undefined.
- (if (and (not (fboundp 'x-display-color-p)) (fboundp 'ns-display-color-p))
- (fset 'x-display-color-p (symbol-function 'ns-display-color-p)))
- (if (and (not (fboundp 'x-color-defined-p)) (fboundp 'ns-color-defined-p))
- (fset 'x-color-defined-p (symbol-function 'ns-color-defined-p)))
-
-
- ;;; XEmacs support
-
-
- (if viper-xemacs-p
- (progn
- (fset 'viper-read-event (symbol-function 'next-command-event))
- (fset 'viper-make-overlay (symbol-function 'make-extent))
- (fset 'viper-overlay-start (symbol-function 'extent-start-position))
- (fset 'viper-overlay-end (symbol-function 'extent-end-position))
- (fset 'viper-overlay-put (symbol-function 'set-extent-property))
- (fset 'viper-overlay-p (symbol-function 'extentp))
- (fset 'viper-overlay-get (symbol-function 'extent-property))
- (fset 'viper-move-overlay (symbol-function 'set-extent-endpoints))
- (if (viper-window-display-p)
- (fset 'viper-iconify (symbol-function 'iconify-frame)))
- (cond ((viper-has-face-support-p)
- (fset 'viper-get-face (symbol-function 'get-face))
- (fset 'viper-color-defined-p
- (symbol-function 'valid-color-name-p))
- )))
- (fset 'viper-read-event (symbol-function 'read-event))
- (fset 'viper-make-overlay (symbol-function 'make-overlay))
- (fset 'viper-overlay-start (symbol-function 'overlay-start))
- (fset 'viper-overlay-end (symbol-function 'overlay-end))
- (fset 'viper-overlay-put (symbol-function 'overlay-put))
- (fset 'viper-overlay-p (symbol-function 'overlayp))
- (fset 'viper-overlay-get (symbol-function 'overlay-get))
- (fset 'viper-move-overlay (symbol-function 'move-overlay))
- (if (viper-window-display-p)
- (fset 'viper-iconify (symbol-function 'iconify-or-deiconify-frame)))
- (cond ((viper-has-face-support-p)
- (fset 'viper-get-face (symbol-function 'internal-get-face))
- (fset 'viper-color-defined-p (symbol-function 'x-color-defined-p))
- )))
-
-
- (fset 'viper-characterp
- (symbol-function
- (if viper-xemacs-p 'characterp 'integerp)))
-
- (defsubst viper-color-display-p ()
- (if viper-emacs-p
- (x-display-color-p)
- (eq (device-class (selected-device)) 'color)))
-
- (defsubst viper-get-cursor-color ()
- (if viper-emacs-p
- (cdr (assoc 'cursor-color (frame-parameters)))
- (color-instance-name (frame-property (selected-frame) 'cursor-color))))
-
- ;;(defun viper-set-face-pixmap (face pixmap)
- ;; "Set face pixmap on a monochrome display."
- ;; (if (and (viper-window-display-p) (not (viper-color-display-p)))
- ;; (condition-case nil
- ;; (set-face-background-pixmap face pixmap)
- ;; (error
- ;; (message "Pixmap not found for %S: %s" (face-name face) pixmap)
- ;; (sit-for 1)))))
-
-
- ;; OS/2
- (cond ((eq (viper-device-type) 'pm)
- (fset 'viper-color-defined-p
- (function (lambda (color) (assoc color pm-color-alist))))))
-
- ;; needed to smooth out the difference between Emacs and XEmacs
- ;;(defsubst viper-italicize-face (face)
- ;; (if viper-xemacs-p
- ;; (make-face-italic face)
- ;; (make-face-italic face nil 'noerror)))
-
- ;; test if display is color and the colors are defined
- ;;(defsubst viper-can-use-colors (&rest colors)
- ;; (if (viper-color-display-p)
- ;; (not (memq nil (mapcar 'viper-color-defined-p colors)))
- ;; ))
-
- ;; cursor colors
- (defun viper-change-cursor-color (new-color)
- (if (and (viper-window-display-p) (viper-color-display-p)
- (stringp new-color) (viper-color-defined-p new-color)
- (not (string= new-color (viper-get-cursor-color))))
- (modify-frame-parameters
- (selected-frame) (list (cons 'cursor-color new-color)))))
-
- (defun viper-save-cursor-color ()
- (if (and (viper-window-display-p) (viper-color-display-p))
- (let ((color (viper-get-cursor-color)))
- (if (and (stringp color) (viper-color-defined-p color)
- (not (string= color viper-replace-overlay-cursor-color)))
- (viper-overlay-put viper-replace-overlay 'viper-cursor-color color)))))
-
- ;; restore cursor color from replace overlay
- (defsubst viper-restore-cursor-color-after-replace ()
- (viper-change-cursor-color
- (viper-overlay-get viper-replace-overlay 'viper-cursor-color)))
- (defsubst viper-restore-cursor-color-after-insert ()
- (viper-change-cursor-color viper-saved-cursor-color))
-
-
-
- ;; Check the current version against the major and minor version numbers
- ;; using op: cur-vers op major.minor If emacs-major-version or
- ;; emacs-minor-version are not defined, we assume that the current version
- ;; is hopelessly outdated. We assume that emacs-major-version and
- ;; emacs-minor-version are defined. Otherwise, for Emacs/XEmacs 19, if the
- ;; current minor version is < 10 (xemacs) or < 23 (emacs) the return value
- ;; will be nil (when op is =, >, or >=) and t (when op is <, <=), which may be
- ;; incorrect. However, this gives correct result in our cases, since we are
- ;; testing for sufficiently high Emacs versions.
- (defun viper-check-version (op major minor &optional type-of-emacs)
- (if (and (boundp 'emacs-major-version) (boundp 'emacs-minor-version))
- (and (cond ((eq type-of-emacs 'xemacs) viper-xemacs-p)
- ((eq type-of-emacs 'emacs) viper-emacs-p)
- (t t))
- (cond ((eq op '=) (and (= emacs-minor-version minor)
- (= emacs-major-version major)))
- ((memq op '(> >= < <=))
- (and (or (funcall op emacs-major-version major)
- (= emacs-major-version major))
- (if (= emacs-major-version major)
- (funcall op emacs-minor-version minor)
- t)))
- (t
- (error "%S: Invalid op in viper-check-version" op))))
- (cond ((memq op '(= > >=)) nil)
- ((memq op '(< <=)) t))))
-
-
- (defun viper-get-visible-buffer-window (wind)
- (if viper-xemacs-p
- (get-buffer-window wind t)
- (get-buffer-window wind 'visible)))
-
-
- ;; Return line position.
- ;; If pos is 'start then returns position of line start.
- ;; If pos is 'end, returns line end. If pos is 'mid, returns line center.
- ;; Pos = 'indent returns beginning of indentation.
- ;; Otherwise, returns point. Current point is not moved in any case."
- (defun viper-line-pos (pos)
- (let ((cur-pos (point))
- (result))
- (cond
- ((equal pos 'start)
- (beginning-of-line))
- ((equal pos 'end)
- (end-of-line))
- ((equal pos 'mid)
- (goto-char (+ (viper-line-pos 'start) (viper-line-pos 'end) 2)))
- ((equal pos 'indent)
- (back-to-indentation))
- (t nil))
- (setq result (point))
- (goto-char cur-pos)
- result))
-
- ;; Emacs counts each multibyte character as several positions in the buffer, so
- ;; we use Emacs' chars-in-region. XEmacs is counting each char as just one pos,
- ;; so we can simply subtract.
- (defun viper-chars-in-region (beg end &optional preserve-sign)
- (let ((count (abs (if (fboundp 'chars-in-region)
- (chars-in-region beg end)
- (- end beg)))))
- (if (and (< end beg) preserve-sign)
- (- count)
- count)))
-
- ;; Test if POS is between BEG and END
- (defsubst viper-pos-within-region (pos beg end)
- (and (>= pos (min beg end)) (>= (max beg end) pos)))
-
-
- ;; Like move-marker but creates a virgin marker if arg isn't already a marker.
- ;; The first argument must eval to a variable name.
- ;; Arguments: (var-name position &optional buffer).
- ;;
- ;; This is useful for moving markers that are supposed to be local.
- ;; For this, VAR-NAME should be made buffer-local with nil as a default.
- ;; Then, each time this var is used in `viper-move-marker-locally' in a new
- ;; buffer, a new marker will be created.
- (defun viper-move-marker-locally (var pos &optional buffer)
- (if (markerp (eval var))
- ()
- (set var (make-marker)))
- (move-marker (eval var) pos buffer))
-
-
- ;; Print CONDITIONS as a message.
- (defun viper-message-conditions (conditions)
- (let ((case (car conditions)) (msg (cdr conditions)))
- (if (null msg)
- (message "%s" case)
- (message "%s: %s" case (mapconcat 'prin1-to-string msg " ")))
- (beep 1)))
-
-
-
- ;;; List/alist utilities
-
- ;; Convert LIST to an alist
- (defun viper-list-to-alist (lst)
- (let ((alist))
- (while lst
- (setq alist (cons (list (car lst)) alist))
- (setq lst (cdr lst)))
- alist))
-
- ;; Convert ALIST to a list.
- (defun viper-alist-to-list (alst)
- (let ((lst))
- (while alst
- (setq lst (cons (car (car alst)) lst))
- (setq alst (cdr alst)))
- lst))
-
- ;; Filter ALIST using REGEXP. Return alist whose elements match the regexp.
- (defun viper-filter-alist (regexp alst)
- (interactive "s x")
- (let ((outalst) (inalst alst))
- (while (car inalst)
- (if (string-match regexp (car (car inalst)))
- (setq outalst (cons (car inalst) outalst)))
- (setq inalst (cdr inalst)))
- outalst))
-
- ;; Filter LIST using REGEXP. Return list whose elements match the regexp.
- (defun viper-filter-list (regexp lst)
- (interactive "s x")
- (let ((outlst) (inlst lst))
- (while (car inlst)
- (if (string-match regexp (car inlst))
- (setq outlst (cons (car inlst) outlst)))
- (setq inlst (cdr inlst)))
- outlst))
-
-
- ;; Append LIS2 to LIS1, both alists, by side-effect and returns LIS1
- ;; LIS2 is modified by filtering it: deleting its members of the form
- ;; \(car elt\) such that (car elt') is in LIS1.
- (defun viper-append-filter-alist (lis1 lis2)
- (let ((temp lis1)
- elt)
-
- ;;filter-append the second list
- (while temp
- ;; delete all occurrences
- (while (setq elt (assoc (car (car temp)) lis2))
- (setq lis2 (delq elt lis2)))
- (setq temp (cdr temp)))
-
- (nconc lis1 lis2)))
-
-
- ;;; Support for :e and file globbing
-
- (defun viper-ex-nontrivial-find-file-unix (filespec)
- "Glob the file spec and visit all files matching the spec.
- This function is designed to work under Unix. It may also work under VMS.
-
- Users who prefer other types of shells should write their own version of this
- function and set the variable `ex-nontrivial-find-file-function'
- appropriately."
- (let ((gshell
- (cond (ex-unix-type-shell shell-file-name)
- ((memq system-type '(vax-vms axp-vms)) "*dcl*") ; VAX VMS
- (t "sh"))) ; probably Unix anyway
- (gshell-options
- ;; using cond in anticipation of further additions
- (cond (ex-unix-type-shell-options)
- ))
- (command (cond (viper-ms-style-os-p (format "\"ls -1 -d %s\"" filespec))
- (t (format "ls -1 -d %s" filespec))))
- file-list status)
- (save-excursion
- (set-buffer (get-buffer-create viper-ex-tmp-buf-name))
- (erase-buffer)
- (setq status
- (if gshell-options
- (call-process gshell nil t nil
- gshell-options
- "-c"
- command)
- (call-process gshell nil t nil
- "-c"
- command)))
- (goto-char (point-min))
- ;; Issue an error, if no match.
- (if (> status 0)
- (save-excursion
- (skip-chars-forward " \t\n\j")
- (if (looking-at "ls:")
- (viper-forward-Word 1))
- (error "%s: %s"
- (if (stringp gshell)
- gshell
- "shell")
- (buffer-substring (point) (viper-line-pos 'end)))
- ))
- (goto-char (point-min))
- (setq file-list (viper-get-filenames-from-buffer 'one-per-line)))
-
- (mapcar 'find-file file-list)
- ))
-
- (defun viper-ex-nontrivial-find-file-ms (filespec)
- "Glob the file spec and visit all files matching the spec.
- This function is designed to work under MS type systems, such as NT, W95, and
- DOS. It may also work under OS/2.
-
- The users of Unix-type shells should be able to use
- `viper-ex-nontrivial-find-file-unix', making it into the value of the variable
- `ex-nontrivial-find-file-function'. If this doesn't work, the user may have
- to write a custom function, similar to `viper-ex-nontrivial-find-file-unix'."
- (save-excursion
- (set-buffer (get-buffer-create viper-ex-tmp-buf-name))
- (erase-buffer)
- (insert filespec)
- (goto-char (point-min))
- (mapcar 'find-file
- (viper-glob-ms-windows-files (viper-get-filenames-from-buffer)))
- ))
-
-
- ;; Interpret the stuff in the buffer as a list of file names
- ;; return a list of file names listed in the buffer beginning at point
- ;; If optional arg is supplied, assume each filename is listed on a separate
- ;; line
- (defun viper-get-filenames-from-buffer (&optional one-per-line)
- (let ((skip-chars (if one-per-line "\t\n" " \t\n"))
- result fname delim)
- (skip-chars-forward skip-chars)
- (while (not (eobp))
- (if (cond ((looking-at "\"")
- (setq delim ?\")
- (re-search-forward "[^\"]+" nil t)) ; noerror
- ((looking-at "'")
- (setq delim ?')
- (re-search-forward "[^']+" nil t)) ; noerror
- (t
- (re-search-forward
- (concat "[^" skip-chars "]+") nil t))) ;noerror
- (setq fname
- (buffer-substring (match-beginning 0) (match-end 0))))
- (if delim
- (forward-char 1))
- (skip-chars-forward " \t\n")
- (setq result (cons fname result)))
- result))
-
- ;; convert MS-DOS wildcards to regexp
- (defun viper-wildcard-to-regexp (wcard)
- (save-excursion
- (set-buffer (get-buffer-create viper-ex-tmp-buf-name))
- (erase-buffer)
- (insert wcard)
- (goto-char (point-min))
- (while (not (eobp))
- (skip-chars-forward "^*?.\\\\")
- (cond ((eq (char-after (point)) ?*) (insert ".")(forward-char 1))
- ((eq (char-after (point)) ?.) (insert "\\")(forward-char 1))
- ((eq (char-after (point)) ?\\) (insert "\\")(forward-char 1))
- ((eq (char-after (point)) ??) (delete-char 1)(insert ".")))
- )
- (buffer-string)
- ))
-
-
- ;; glob windows files
- ;; LIST is expected to be in reverse order
- (defun viper-glob-ms-windows-files (list)
- (let ((tmp list)
- (case-fold-search t)
- tmp2)
- (while tmp
- (setq tmp2 (cons (directory-files
- ;; the directory part
- (or (file-name-directory (car tmp))
- "")
- t ; return full names
- ;; the regexp part: globs the file names
- (concat "^"
- (viper-wildcard-to-regexp
- (file-name-nondirectory (car tmp)))
- "$"))
- tmp2))
- (setq tmp (cdr tmp)))
- (reverse (apply 'append tmp2))))
-
-
- ;;; Insertion ring
-
- ;; Rotate RING's index. DIRection can be positive or negative.
- (defun viper-ring-rotate1 (ring dir)
- (if (and (ring-p ring) (> (ring-length ring) 0))
- (progn
- (setcar ring (cond ((> dir 0)
- (ring-plus1 (car ring) (ring-length ring)))
- ((< dir 0)
- (ring-minus1 (car ring) (ring-length ring)))
- ;; don't rotate if dir = 0
- (t (car ring))))
- (viper-current-ring-item ring)
- )))
-
- (defun viper-special-ring-rotate1 (ring dir)
- (if (memq viper-intermediate-command
- '(repeating-display-destructive-command
- repeating-insertion-from-ring))
- (viper-ring-rotate1 ring dir)
- ;; don't rotate otherwise
- (viper-ring-rotate1 ring 0)))
-
- ;; current ring item; if N is given, then so many items back from the
- ;; current
- (defun viper-current-ring-item (ring &optional n)
- (setq n (or n 0))
- (if (and (ring-p ring) (> (ring-length ring) 0))
- (aref (cdr (cdr ring)) (mod (- (car ring) 1 n) (ring-length ring)))))
-
- ;; push item onto ring. the second argument is a ring-variable, not value.
- (defun viper-push-onto-ring (item ring-var)
- (or (ring-p (eval ring-var))
- (set ring-var (make-ring (eval (intern (format "%S-size" ring-var))))))
- (or (null item) ; don't push nil
- (and (stringp item) (string= item "")) ; or empty strings
- (equal item (viper-current-ring-item (eval ring-var))) ; or old stuff
- ;; Since viper-set-destructive-command checks if we are inside
- ;; viper-repeat, we don't check whether this-command-keys is a `.'. The
- ;; cmd viper-repeat makes a call to the current function only if `.' is
- ;; executing a command from the command history. It doesn't call the
- ;; push-onto-ring function if `.' is simply repeating the last
- ;; destructive command. We only check for ESC (which happens when we do
- ;; insert with a prefix argument, or if this-command-keys doesn't give
- ;; anything meaningful (in that case we don't know what to show to the
- ;; user).
- (and (eq ring-var 'viper-command-ring)
- (string-match "\\([0-9]*\e\\|^[ \t]*$\\|escape\\)"
- (viper-array-to-string (this-command-keys))))
- (viper-ring-insert (eval ring-var) item))
- )
-
-
- ;; removing elts from ring seems to break it
- (defun viper-cleanup-ring (ring)
- (or (< (ring-length ring) 2)
- (null (viper-current-ring-item ring))
- ;; last and previous equal
- (if (equal (viper-current-ring-item ring)
- (viper-current-ring-item ring 1))
- (viper-ring-pop ring))))
-
- ;; ring-remove seems to be buggy, so we concocted this for our purposes.
- (defun viper-ring-pop (ring)
- (let* ((ln (ring-length ring))
- (vec (cdr (cdr ring)))
- (veclen (length vec))
- (hd (car ring))
- (idx (max 0 (ring-minus1 hd ln)))
- (top-elt (aref vec idx)))
-
- ;; shift elements
- (while (< (1+ idx) veclen)
- (aset vec idx (aref vec (1+ idx)))
- (setq idx (1+ idx)))
- (aset vec idx nil)
-
- (setq hd (max 0 (ring-minus1 hd ln)))
- (if (= hd (1- ln)) (setq hd 0))
- (setcar ring hd) ; move head
- (setcar (cdr ring) (max 0 (1- ln))) ; adjust length
- top-elt
- ))
-
- (defun viper-ring-insert (ring item)
- (let* ((ln (ring-length ring))
- (vec (cdr (cdr ring)))
- (veclen (length vec))
- (hd (car ring))
- (vecpos-after-hd (if (= hd 0) ln hd))
- (idx ln))
-
- (if (= ln veclen)
- (progn
- (aset vec hd item) ; hd is always 1+ the actual head index in vec
- (setcar ring (ring-plus1 hd ln)))
- (setcar (cdr ring) (1+ ln))
- (setcar ring (ring-plus1 vecpos-after-hd (1+ ln)))
- (while (and (>= idx vecpos-after-hd) (> ln 0))
- (aset vec idx (aref vec (1- idx)))
- (setq idx (1- idx)))
- (aset vec vecpos-after-hd item))
- item))
-
-
- ;;; String utilities
-
- ;; If STRING is longer than MAX-LEN, truncate it and print ...... instead
- ;; PRE-STRING is a string to prepend to the abbrev string.
- ;; POST-STRING is a string to append to the abbrev string.
- ;; ABBREV_SIGN is a string to be inserted before POST-STRING
- ;; if the orig string was truncated.
- (defun viper-abbreviate-string (string max-len
- pre-string post-string abbrev-sign)
- (let (truncated-str)
- (setq truncated-str
- (if (stringp string)
- (substring string 0 (min max-len (length string)))))
- (cond ((null truncated-str) "")
- ((> (length string) max-len)
- (format "%s%s%s%s"
- pre-string truncated-str abbrev-sign post-string))
- (t (format "%s%s%s" pre-string truncated-str post-string)))))
-
- ;; tells if we are over a whitespace-only line
- (defsubst viper-over-whitespace-line ()
- (save-excursion
- (beginning-of-line)
- (looking-at "^[ \t]*$")))
-
-
- ;;; Saving settings in custom file
-
- ;; Save the current setting of VAR in CUSTOM-FILE.
- ;; If given, MESSAGE is a message to be displayed after that.
- ;; This message is erased after 2 secs, if erase-msg is non-nil.
- ;; Arguments: var message custom-file &optional erase-message
- (defun viper-save-setting (var message custom-file &optional erase-msg)
- (let* ((var-name (symbol-name var))
- (var-val (if (boundp var) (eval var)))
- (regexp (format "^[^;]*%s[ \t\n]*[a-zA-Z---_']*[ \t\n)]" var-name))
- (buf (find-file-noselect (substitute-in-file-name custom-file)))
- )
- (message message)
- (save-excursion
- (set-buffer buf)
- (goto-char (point-min))
- (if (re-search-forward regexp nil t)
- (let ((reg-end (1- (match-end 0))))
- (search-backward var-name)
- (delete-region (match-beginning 0) reg-end)
- (goto-char (match-beginning 0))
- (insert (format "%s '%S" var-name var-val)))
- (goto-char (point-max))
- (if (not (bolp)) (insert "\n"))
- (insert (format "(setq %s '%S)\n" var-name var-val)))
- (save-buffer))
- (kill-buffer buf)
- (if erase-msg
- (progn
- (sit-for 2)
- (message "")))
- ))
-
- ;; Save STRING in CUSTOM-FILE. If PATTERN is non-nil, remove strings that
- ;; match this pattern.
- (defun viper-save-string-in-file (string custom-file &optional pattern)
- (let ((buf (find-file-noselect (substitute-in-file-name custom-file))))
- (save-excursion
- (set-buffer buf)
- (goto-char (point-min))
- (if pattern (delete-matching-lines pattern))
- (goto-char (point-max))
- (if string (insert string))
- (save-buffer))
- (kill-buffer buf)
- ))
-
-
- ;;; Overlays
-
- ;; Search
-
- (defun viper-flash-search-pattern ()
- (if (viper-overlay-p viper-search-overlay)
- (viper-move-overlay
- viper-search-overlay (match-beginning 0) (match-end 0))
- (setq viper-search-overlay
- (viper-make-overlay
- (match-beginning 0) (match-end 0) (current-buffer))))
-
- (viper-overlay-put
- viper-search-overlay 'priority viper-search-overlay-priority)
- (if (viper-has-face-support-p)
- (progn
- (viper-overlay-put viper-search-overlay 'face viper-search-face)
- (sit-for 2)
- (viper-overlay-put viper-search-overlay 'face nil))))
-
-
- ;; Replace state
-
- (defsubst viper-move-replace-overlay (beg end)
- (viper-move-overlay viper-replace-overlay beg end))
-
- (defun viper-set-replace-overlay (beg end)
- (if (viper-overlay-p viper-replace-overlay)
- (viper-move-replace-overlay beg end)
- (setq viper-replace-overlay (viper-make-overlay beg end (current-buffer)))
- ;; never detach
- (viper-overlay-put
- viper-replace-overlay (if viper-emacs-p 'evaporate 'detachable) nil)
- (viper-overlay-put
- viper-replace-overlay 'priority viper-replace-overlay-priority)
- ;; If Emacs will start supporting overlay maps, as it currently supports
- ;; text-property maps, we could do away with viper-replace-minor-mode and
- ;; just have keymap attached to replace overlay.
- ;;(viper-overlay-put
- ;; viper-replace-overlay
- ;; (if viper-xemacs-p 'keymap 'local-map)
- ;; viper-replace-map)
- )
- (if (viper-has-face-support-p)
- (viper-overlay-put
- viper-replace-overlay 'face viper-replace-overlay-face))
- (viper-save-cursor-color)
- (viper-change-cursor-color viper-replace-overlay-cursor-color)
- )
-
-
- (defun viper-set-replace-overlay-glyphs (before-glyph after-glyph)
- (if (or (not (viper-has-face-support-p))
- viper-use-replace-region-delimiters)
- (let ((before-name (if viper-xemacs-p 'begin-glyph 'before-string))
- (after-name (if viper-xemacs-p 'end-glyph 'after-string)))
- (viper-overlay-put viper-replace-overlay before-name before-glyph)
- (viper-overlay-put viper-replace-overlay after-name after-glyph))))
-
- (defun viper-hide-replace-overlay ()
- (viper-set-replace-overlay-glyphs nil nil)
- (viper-restore-cursor-color-after-replace)
- (viper-restore-cursor-color-after-insert)
- (if (viper-has-face-support-p)
- (viper-overlay-put viper-replace-overlay 'face nil)))
-
-
- (defsubst viper-replace-start ()
- (viper-overlay-start viper-replace-overlay))
- (defsubst viper-replace-end ()
- (viper-overlay-end viper-replace-overlay))
-
-
- ;; Minibuffer
-
- (defun viper-set-minibuffer-overlay ()
- (viper-check-minibuffer-overlay)
- (if (viper-has-face-support-p)
- (progn
- (viper-overlay-put
- viper-minibuffer-overlay 'face viper-minibuffer-current-face)
- (viper-overlay-put
- viper-minibuffer-overlay 'priority viper-minibuffer-overlay-priority)
- ;; never detach
- (viper-overlay-put
- viper-minibuffer-overlay
- (if viper-emacs-p 'evaporate 'detachable)
- nil)
- ;; make viper-minibuffer-overlay open-ended
- ;; In emacs, it is made open ended at creation time
- (if viper-xemacs-p
- (progn
- (viper-overlay-put viper-minibuffer-overlay 'start-open nil)
- (viper-overlay-put viper-minibuffer-overlay 'end-open nil)))
- )))
-
- (defun viper-check-minibuffer-overlay ()
- (or (viper-overlay-p viper-minibuffer-overlay)
- (setq viper-minibuffer-overlay
- (if viper-xemacs-p
- (viper-make-overlay 1 (1+ (buffer-size)) (current-buffer))
- ;; make overlay open-ended
- (viper-make-overlay
- 1 (1+ (buffer-size)) (current-buffer) nil 'rear-advance)))
- ))
-
-
- (defsubst viper-is-in-minibuffer ()
- (string-match "\*Minibuf-" (buffer-name)))
-
-
-
- ;;; XEmacs compatibility
-
- (defun viper-abbreviate-file-name (file)
- (if viper-emacs-p
- (abbreviate-file-name file)
- ;; XEmacs requires addl argument
- (abbreviate-file-name file t)))
-
- ;; Sit for VAL milliseconds. XEmacs doesn't support the millisecond arg
- ;; in sit-for, so this function smoothes out the differences.
- (defsubst viper-sit-for-short (val &optional nodisp)
- (if viper-xemacs-p
- (sit-for (/ val 1000.0) nodisp)
- (sit-for 0 val nodisp)))
-
- ;; EVENT may be a single event of a sequence of events
- (defsubst viper-ESC-event-p (event)
- (let ((ESC-keys '(?\e (control \[) escape))
- (key (viper-event-key event)))
- (member key ESC-keys)))
-
- ;; checks if object is a marker, has a buffer, and points to within that buffer
- (defun viper-valid-marker (marker)
- (if (and (markerp marker) (marker-buffer marker))
- (let ((buf (marker-buffer marker))
- (pos (marker-position marker)))
- (save-excursion
- (set-buffer buf)
- (and (<= pos (point-max)) (<= (point-min) pos))))))
-
- (defsubst viper-mark-marker ()
- (if viper-xemacs-p
- (mark-marker t)
- (mark-marker)))
-
- ;; like (set-mark-command nil) but doesn't push twice, if (car mark-ring)
- ;; is the same as (mark t).
- (defsubst viper-set-mark-if-necessary ()
- (setq mark-ring (delete (viper-mark-marker) mark-ring))
- (set-mark-command nil))
-
- ;; In transient mark mode (zmacs mode), it is annoying when regions become
- ;; highlighted due to Viper's pushing marks. So, we deactivate marks, unless
- ;; the user explicitly wants highlighting, e.g., by hitting '' or ``
- (defun viper-deactivate-mark ()
- (if viper-xemacs-p
- (zmacs-deactivate-region)
- (deactivate-mark)))
-
- (defsubst viper-leave-region-active ()
- (if viper-xemacs-p
- (setq zmacs-region-stays t)))
-
- ;; Check if arg is a valid character for register
- ;; TYPE is a list that can contain `letter', `Letter', and `digit'.
- ;; Letter means lowercase letters, Letter means uppercase letters, and
- ;; digit means digits from 1 to 9.
- ;; If TYPE is nil, then down/uppercase letters and digits are allowed.
- (defun viper-valid-register (reg &optional type)
- (or type (setq type '(letter Letter digit)))
- (or (if (memq 'letter type)
- (and (<= ?a reg) (<= reg ?z)))
- (if (memq 'digit type)
- (and (<= ?1 reg) (<= reg ?9)))
- (if (memq 'Letter type)
- (and (<= ?A reg) (<= reg ?Z)))
- ))
-
-
- (defsubst viper-events-to-keys (events)
- (cond (viper-xemacs-p (events-to-keys events))
- (t events)))
-
-
- ;; This is here because Emacs changed the way local hooks work.
- ;;
- ;;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."
- (defun viper-add-hook (hook function &optional append)
- (if (not (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))
- (setq old (list old)))
- (if (member function old)
- nil
- (set hook (if append
- (append old (list function)) ; don't nconc
- (cons function old))))))
-
- ;; This is here because of Emacs's changes in the semantics of add/remove-hooks
- ;; and due to the bugs they introduced.
- ;;
- ;; 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 `viper-add-hook'."
- (defun viper-remove-hook (hook function)
- (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)
- ;; don't side-effect the list
- (setq hook-value (delete function (copy-sequence hook-value)))
- (if (equal hook-value function)
- (setq hook-value nil)))
- (set hook hook-value))))
-
-
- ;; it is suggested that an event must be copied before it is assigned to
- ;; last-command-event in XEmacs
- (defun viper-copy-event (event)
- (if viper-xemacs-p
- (copy-event event)
- event))
-
- ;; like read-event, but in XEmacs also try to convert to char, if possible
- (defun viper-read-event-convert-to-char ()
- (let (event)
- (if viper-emacs-p
- (read-event)
- (setq event (next-command-event))
- (or (event-to-character event)
- event))
- ))
-
- ;; This function lets function-key-map convert key sequences into logical
- ;; keys. This does a better job than viper-read-event when it comes to kbd
- ;; macros, since it enables certain macros to be shared between X and TTY modes
- ;; by correctly mapping key sequences for Left/Right/... (one an ascii
- ;; terminal) into logical keys left, right, etc.
- (defun viper-read-key ()
- (let ((overriding-local-map viper-overriding-map)
- (inhibit-quit t)
- help-char key)
- (use-global-map viper-overriding-map)
- (unwind-protect
- (setq key (elt (read-key-sequence nil) 0))
- (use-global-map global-map))
- key))
-
-
- ;; Emacs has a bug in eventp, which causes (eventp nil) to return (nil)
- ;; instead of nil, if '(nil) was previously inadvertently assigned to
- ;; unread-command-events
- (defun viper-event-key (event)
- (or (and event (eventp event))
- (error "viper-event-key: Wrong type argument, eventp, %S" event))
- (when (cond (viper-xemacs-p (or (key-press-event-p event)
- (mouse-event-p event)))
- (t t))
- (let ((mod (event-modifiers event))
- basis)
- (setq basis
- (cond
- (viper-xemacs-p
- (cond ((key-press-event-p event)
- (event-key event))
- ((button-event-p event)
- (concat "mouse-" (prin1-to-string (event-button event))))
- (t
- (error "viper-event-key: Unknown event, %S" event))))
- (t
- ;; Emacs doesn't handle capital letters correctly, since
- ;; \S-a isn't considered the same as A (it behaves as
- ;; plain `a' instead). So we take care of this here
- (cond ((and (viper-characterp event) (<= ?A event) (<= event ?Z))
- (setq mod nil
- event event))
- ;; Emacs has the oddity whereby characters 128+char
- ;; represent M-char *if* this appears inside a string.
- ;; So, we convert them manually to (meta char).
- ((and (viper-characterp event)
- (< ?\C-? event) (<= event 255))
- (setq mod '(meta)
- event (- event ?\C-? 1)))
- ((and (null mod) (eq event 'return))
- (setq event ?\C-m))
- ((and (null mod) (eq event 'space))
- (setq event ?\ ))
- ((and (null mod) (eq event 'delete))
- (setq event ?\C-?))
- ((and (null mod) (eq event 'backspace))
- (setq event ?\C-h))
- (t (event-basic-type event)))
- )))
- (if (viper-characterp basis)
- (setq basis
- (if (= basis ?\C-?)
- (list 'control '\?) ; taking care of an emacs bug
- (intern (char-to-string basis)))))
- (if mod
- (append mod (list basis))
- basis))))
-
- (defun viper-key-to-emacs-key (key)
- (let (key-name char-p modifiers mod-char-list base-key base-key-name)
- (cond (viper-xemacs-p key)
-
- ((symbolp key)
- (setq key-name (symbol-name key))
- (cond ((= (length key-name) 1) ; character event
- (string-to-char key-name))
- ;; Emacs doesn't recognize `return' and `escape' as events on
- ;; dumb terminals, so we translate them into characters
- ((and viper-emacs-p (not (viper-window-display-p))
- (string= key-name "return"))
- ?\C-m)
- ((and viper-emacs-p (not (viper-window-display-p))
- (string= key-name "escape"))
- ?\e)
- ;; pass symbol-event as is
- (t key)))
-
- ((listp key)
- (setq modifiers (subseq key 0 (1- (length key)))
- base-key (viper-seq-last-elt key)
- base-key-name (symbol-name base-key)
- char-p (= (length base-key-name) 1))
- (setq mod-char-list
- (mapcar
- '(lambda (elt) (upcase (substring (symbol-name elt) 0 1)))
- modifiers))
- (if char-p
- (setq key-name
- (car (read-from-string
- (concat
- "?\\"
- (mapconcat 'identity mod-char-list "-\\")
- "-"
- base-key-name))))
- (setq key-name
- (intern
- (concat
- (mapconcat 'identity mod-char-list "-")
- "-"
- base-key-name))))))
- ))
-
-
- ;; Args can be a sequence of events, a string, or a Viper macro. Will try to
- ;; convert events to keys and, if all keys are regular printable
- ;; characters, will return a string. Otherwise, will return a string
- ;; representing a vector of converted events. If the input was a Viper macro,
- ;; will return a string that represents this macro as a vector.
- (defun viper-array-to-string (event-seq)
- (let (temp temp2)
- (cond ((stringp event-seq) event-seq)
- ((viper-event-vector-p event-seq)
- (setq temp (mapcar 'viper-event-key event-seq))
- (cond ((viper-char-symbol-sequence-p temp)
- (mapconcat 'symbol-name temp ""))
- ((and (viper-char-array-p
- (setq temp2 (mapcar 'viper-key-to-character temp))))
- (mapconcat 'char-to-string temp2 ""))
- (t (prin1-to-string (vconcat temp)))))
- ((viper-char-symbol-sequence-p event-seq)
- (mapconcat 'symbol-name event-seq ""))
- ((and (vectorp event-seq)
- (viper-char-array-p
- (setq temp (mapcar 'viper-key-to-character event-seq))))
- (mapconcat 'char-to-string temp ""))
- (t (prin1-to-string event-seq)))))
-
- (defun viper-key-press-events-to-chars (events)
- (mapconcat (if viper-emacs-p
- 'char-to-string
- (function
- (lambda (elt) (char-to-string (event-to-character elt)))))
- events
- ""))
-
-
- ;; Uses different timeouts for ESC-sequences and others
- (defsubst viper-fast-keysequence-p ()
- (not (viper-sit-for-short
- (if (viper-ESC-event-p last-input-event)
- viper-ESC-keyseq-timeout
- viper-fast-keyseq-timeout)
- t)))
-
- (defun viper-read-char-exclusive ()
- (let (char
- (echo-keystrokes 1))
- (while (null char)
- (condition-case nil
- (setq char (read-char))
- (error
- ;; skip event if not char
- (viper-read-event))))
- char))
-
- ;; key is supposed to be in viper's representation, e.g., (control l), a
- ;; character, etc.
- (defun viper-key-to-character (key)
- (cond ((eq key 'space) ?\ )
- ((eq key 'delete) ?\C-?)
- ((eq key 'return) ?\C-m)
- ((eq key 'backspace) ?\C-h)
- ((and (symbolp key)
- (= 1 (length (symbol-name key))))
- (string-to-char (symbol-name key)))
- ((and (listp key)
- (eq (car key) 'control)
- (symbol-name (nth 1 key))
- (= 1 (length (symbol-name (nth 1 key)))))
- (read (format "?\\C-%s" (symbol-name (nth 1 key)))))
- (t key)))
-
-
- (defun viper-setup-master-buffer (&rest other-files-or-buffers)
- "Set up the current buffer as a master buffer.
- Arguments become related buffers. This function should normally be used in
- the `Local variables' section of a file."
- (setq viper-related-files-and-buffers-ring
- (make-ring (1+ (length other-files-or-buffers))))
- (mapcar '(lambda (elt)
- (viper-ring-insert viper-related-files-and-buffers-ring elt))
- other-files-or-buffers)
- (viper-ring-insert viper-related-files-and-buffers-ring (buffer-name))
- )
-
- ;;; Movement utilities
-
- ;; Characters that should not be considered as part of the word, in reformed-vi
- ;; syntax mode.
- (defconst viper-non-word-characters-reformed-vi
- "!@#$%^&*()-+=|\\~`{}[];:'\",<.>/?")
- ;; These are characters that are not to be considered as parts of a word in
- ;; Viper.
- ;; Set each time state changes and at loading time
- (viper-deflocalvar viper-non-word-characters nil)
-
- ;; must be buffer-local
- (viper-deflocalvar viper-ALPHA-char-class "w"
- "String of syntax classes characterizing Viper's alphanumeric symbols.
- In addition, the symbol `_' may be considered alphanumeric if
- `viper-syntax-preference' is `strict-vi' or `reformed-vi'.")
-
- (defconst viper-strict-ALPHA-chars "a-zA-Z0-9_"
- "Regexp matching the set of alphanumeric characters acceptable to strict
- Vi.")
- (defconst viper-strict-SEP-chars " \t\n"
- "Regexp matching the set of alphanumeric characters acceptable to strict
- Vi.")
- (defconst viper-strict-SEP-chars-sans-newline " \t"
- "Regexp matching the set of alphanumeric characters acceptable to strict
- Vi.")
-
- (defconst viper-SEP-char-class " -"
- "String of syntax classes for Vi separators.
- Usually contains ` ', linefeed, TAB or formfeed.")
-
-
- ;; Set Viper syntax classes and related variables according to
- ;; `viper-syntax-preference'.
- (defun viper-update-syntax-classes (&optional set-default)
- (let ((preference (cond ((eq viper-syntax-preference 'emacs)
- "w") ; Viper words have only Emacs word chars
- ((eq viper-syntax-preference 'extended)
- "w_") ; Viper words have Emacs word & symbol chars
- (t "w"))) ; Viper words are Emacs words plus `_'
- (non-word-chars (cond ((eq viper-syntax-preference 'reformed-vi)
- (viper-string-to-list
- viper-non-word-characters-reformed-vi))
- (t nil))))
- (if set-default
- (setq-default viper-ALPHA-char-class preference
- viper-non-word-characters non-word-chars)
- (setq viper-ALPHA-char-class preference
- viper-non-word-characters non-word-chars))
- ))
-
- ;; SYMBOL is used because customize requires it, but it is ignored, unless it
- ;; is `nil'. If nil, use setq.
- (defun viper-set-syntax-preference (&optional symbol value)
- "Set Viper syntax preference.
- If called interactively or if SYMBOL is nil, sets syntax preference in current
- buffer. If called non-interactively, preferably via the customization widget,
- sets the default value."
- (interactive)
- (or value
- (setq value
- (completing-read
- "Viper syntax preference: "
- '(("strict-vi") ("reformed-vi") ("extended") ("emacs"))
- nil 'require-match)))
- (if (stringp value) (setq value (intern value)))
- (or (memq value '(strict-vi reformed-vi extended emacs))
- (error "Invalid Viper syntax preference, %S" value))
- (if symbol
- (setq-default viper-syntax-preference value)
- (setq viper-syntax-preference value))
- (viper-update-syntax-classes))
-
- (defcustom viper-syntax-preference 'reformed-vi
- "*Syntax type characterizing Viper's alphanumeric symbols.
- Affects movement and change commands that deal with Vi-style words.
- Works best when set in the hooks to various major modes.
-
- `strict-vi' means Viper words are (hopefully) exactly as in Vi.
-
- `reformed-vi' means Viper words are like Emacs words \(as determined using
- Emacs syntax tables, which are different for different major modes\) with two
- exceptions: the symbol `_' is always part of a word and typical Vi non-word
- symbols, such as `,',:,\",),{, etc., are excluded.
- This behaves very close to `strict-vi', but also works well with non-ASCII
- characters from various alphabets.
-
- `extended' means Viper word constituents are symbols that are marked as being
- parts of words OR symbols in Emacs syntax tables.
- This is most appropriate for major modes intended for editing programs.
-
- `emacs' means Viper words are the same as Emacs words as specified by Emacs
- syntax tables.
- This option is appropriate if you like Emacs-style words."
- :type '(radio (const strict-vi) (const reformed-vi)
- (const extended) (const emacs))
- :set 'viper-set-syntax-preference
- :group 'viper)
- (make-variable-buffer-local 'viper-syntax-preference)
-
-
- ;; addl-chars are characters to be temporarily considered as alphanumerical
- (defun viper-looking-at-alpha (&optional addl-chars)
- (or (stringp addl-chars) (setq addl-chars ""))
- (if (eq viper-syntax-preference 'reformed-vi)
- (setq addl-chars (concat addl-chars "_")))
- (let ((char (char-after (point))))
- (if char
- (if (eq viper-syntax-preference 'strict-vi)
- (looking-at (concat "[" viper-strict-ALPHA-chars addl-chars "]"))
- (or
- ;; or one of the additional chars being asked to include
- (memq char (viper-string-to-list addl-chars))
- (and
- ;; not one of the excluded word chars
- (not (memq char viper-non-word-characters))
- ;; char of the Viper-word syntax class
- (memq (char-syntax char)
- (viper-string-to-list viper-ALPHA-char-class))))))
- ))
-
- (defun viper-looking-at-separator ()
- (let ((char (char-after (point))))
- (if char
- (if (eq viper-syntax-preference 'strict-vi)
- (memq char (viper-string-to-list viper-strict-SEP-chars))
- (or (eq char ?\n) ; RET is always a separator in Vi
- (memq (char-syntax char)
- (viper-string-to-list viper-SEP-char-class)))))
- ))
-
- (defsubst viper-looking-at-alphasep (&optional addl-chars)
- (or (viper-looking-at-separator) (viper-looking-at-alpha addl-chars)))
-
- (defun viper-skip-alpha-forward (&optional addl-chars)
- (or (stringp addl-chars) (setq addl-chars ""))
- (viper-skip-syntax
- 'forward
- (cond ((eq viper-syntax-preference 'strict-vi)
- "")
- (t viper-ALPHA-char-class))
- (cond ((eq viper-syntax-preference 'strict-vi)
- (concat viper-strict-ALPHA-chars addl-chars))
- (t addl-chars))))
-
- (defun viper-skip-alpha-backward (&optional addl-chars)
- (or (stringp addl-chars) (setq addl-chars ""))
- (viper-skip-syntax
- 'backward
- (cond ((eq viper-syntax-preference 'strict-vi)
- "")
- (t viper-ALPHA-char-class))
- (cond ((eq viper-syntax-preference 'strict-vi)
- (concat viper-strict-ALPHA-chars addl-chars))
- (t addl-chars))))
-
- ;; weird syntax tables may confuse strict-vi style
- (defsubst viper-skip-all-separators-forward (&optional within-line)
- (if (eq viper-syntax-preference 'strict-vi)
- (if within-line
- (skip-chars-forward viper-strict-SEP-chars-sans-newline)
- (skip-chars-forward viper-strict-SEP-chars))
- (viper-skip-syntax 'forward
- viper-SEP-char-class
- (or within-line "\n")
- (if within-line (viper-line-pos 'end)))))
- (defsubst viper-skip-all-separators-backward (&optional within-line)
- (if (eq viper-syntax-preference 'strict-vi)
- (if within-line
- (skip-chars-backward viper-strict-SEP-chars-sans-newline)
- (skip-chars-backward viper-strict-SEP-chars))
- (viper-skip-syntax 'backward
- viper-SEP-char-class
- (or within-line "\n")
- (if within-line (viper-line-pos 'start)))))
- (defun viper-skip-nonseparators (direction)
- (viper-skip-syntax
- direction
- (concat "^" viper-SEP-char-class)
- nil
- (viper-line-pos (if (eq direction 'forward) 'end 'start))))
-
-
- ;; skip over non-word constituents and non-separators
- (defun viper-skip-nonalphasep-forward ()
- (if (eq viper-syntax-preference 'strict-vi)
- (skip-chars-forward
- (concat "^" viper-strict-SEP-chars viper-strict-ALPHA-chars))
- (viper-skip-syntax
- 'forward
- (concat "^" viper-ALPHA-char-class viper-SEP-char-class)
- ;; Emacs may consider some of these as words, but we don't want them
- viper-non-word-characters
- (viper-line-pos 'end))))
- (defun viper-skip-nonalphasep-backward ()
- (if (eq viper-syntax-preference 'strict-vi)
- (skip-chars-backward
- (concat "^" viper-strict-SEP-chars viper-strict-ALPHA-chars))
- (viper-skip-syntax
- 'backward
- (concat "^" viper-ALPHA-char-class viper-SEP-char-class)
- ;; Emacs may consider some of these as words, but we don't want them
- viper-non-word-characters
- (viper-line-pos 'start))))
-
- ;; Skip SYNTAX like skip-syntax-* and ADDL-CHARS like skip-chars-*
- ;; Return the number of chars traveled.
- ;; Both SYNTAX or ADDL-CHARS can be strings or lists of characters.
- ;; When SYNTAX is "w", then viper-non-word-characters are not considered to be
- ;; words, even if Emacs syntax table says they are.
- (defun viper-skip-syntax (direction syntax addl-chars &optional limit)
- (let ((total 0)
- (local 1)
- (skip-chars-func
- (if (eq direction 'forward)
- 'skip-chars-forward 'skip-chars-backward))
- (skip-syntax-func
- (if (eq direction 'forward)
- 'viper-forward-char-carefully 'viper-backward-char-carefully))
- char-looked-at syntax-of-char-looked-at negated-syntax)
- (setq addl-chars
- (cond ((listp addl-chars) (viper-charlist-to-string addl-chars))
- ((stringp addl-chars) addl-chars)
- (t "")))
- (setq syntax
- (cond ((listp syntax) syntax)
- ((stringp syntax) (viper-string-to-list syntax))
- (t nil)))
- (if (memq ?^ syntax) (setq negated-syntax t))
-
- (while (and (not (= local 0)) (not (eobp)))
- (setq char-looked-at (viper-char-at-pos direction)
- ;; if outside the range, set to nil
- syntax-of-char-looked-at (if char-looked-at
- (char-syntax char-looked-at)))
- (setq local
- (+ (if (and
- (cond ((and limit (eq direction 'forward))
- (< (point) limit))
- (limit ; backward & limit
- (> (point) limit))
- (t t)) ; no limit
- ;; char under/before cursor has appropriate syntax
- (if negated-syntax
- (not (memq syntax-of-char-looked-at syntax))
- (memq syntax-of-char-looked-at syntax))
- ;; if char-syntax class is "word", make sure it is not one
- ;; of the excluded characters
- (if (and (eq syntax-of-char-looked-at ?w)
- (not negated-syntax))
- (not (memq char-looked-at viper-non-word-characters))
- t))
- (funcall skip-syntax-func 1)
- 0)
- (funcall skip-chars-func addl-chars limit)))
- (setq total (+ total local)))
- total
- ))
-
-
-
- (provide 'viper-util)
-
-
- ;;; Local Variables:
- ;;; eval: (put 'viper-deflocalvar 'lisp-indent-hook 'defun)
- ;;; End:
-
- ;;; viper-util.el ends here
-