[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Patch for "virtual buffers" in iswitchb
From: |
John Wiegley |
Subject: |
Patch for "virtual buffers" in iswitchb |
Date: |
Sun, 18 Apr 2004 04:13:37 -0700 |
User-agent: |
Gnus/5.110002 (No Gnus v0.2) Emacs/21.3.50 (darwin) |
Haven't signed my general papers yet, and would like some review on
this anyway:
The following patch adds a feature to iswitchb (off by default) that I
call "virtual buffers". Basically, when a buffer visiting a file is
killed, iswitchb remembers the name and location of that file. If the
user then types a search string and fails to match a living buffer,
iswitchb will consult the list of remembered ones, and allow the user
to match against those names. Fontification is changed to reflect
that these are "virtual" matches. If a virtual buffer is selected,
the buffer is resurrected by visiting the last known path associated
with that buffer name.
The motivation for this patch is that many of the files I open using
C-x C-f are being reopened. Combined with a module like session.el,
virtual buffers allow my work environment to become more predictive.
John
Index: iswitchb.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/iswitchb.el,v
retrieving revision 1.48
diff -w -U3 -r1.48 iswitchb.el
--- iswitchb.el 18 Apr 2004 10:31:29 -0000 1.48
+++ iswitchb.el 18 Apr 2004 11:08:53 -0000
@@ -305,6 +305,20 @@
:type 'integer
:group 'iswitchb)
+(defcustom iswitchb-use-virtual-buffers nil
+ "*If non-nil, refer to past buffers when none match."
+ :type 'boolean
+ :set (function
+ (lambda (sym value)
+ (if value
+ (add-hook 'kill-buffer-hook 'iswitchb-remember-file)
+ (remove-hook 'kill-buffer-hook 'iswitchb-remember-file))
+ (set sym value)))
+ :group 'iswitchb)
+
+(defvar iswitchb-virtual-buffer-alist nil)
+(defvar iswitchb-virtual-buffers nil)
+
(defcustom iswitchb-cannot-complete-hook 'iswitchb-completion-help
"*Hook run when `iswitchb-complete' can't complete any more.
The most useful values are `iswitchb-completion-help', which pops up a
@@ -613,7 +627,17 @@
(if (and (not (eq iswitchb-exit 'usefirst))
(get-buffer iswitchb-final-text))
;; This happens for example if the buffer was chosen with the mouse.
- (setq iswitchb-matches (list iswitchb-final-text)))
+ (setq iswitchb-matches (list iswitchb-final-text)
+ iswitchb-virtual-buffers nil))
+
+ (if (and iswitchb-use-virtual-buffers
+ (not (iswitchb-existing-buffer-p))
+ iswitchb-virtual-buffers)
+ (let ((virt (assoc (car iswitchb-virtual-buffers)
+ iswitchb-virtual-buffer-alist)))
+ (find-file-noselect (cdr virt))
+ (setq iswitchb-matches (list (car virt))
+ iswitchb-virtual-buffers nil)))
;; Handling the require-match must be done in a better way.
(if (and require-match (not (iswitchb-existing-buffer-p)))
@@ -833,7 +857,8 @@
(setq iswitchb-matches
(let* ((buflist iswitchb-buflist))
(iswitchb-get-matched-buffers iswitchb-text iswitchb-regexp
- buflist)))))
+ buflist))
+ iswitchb-virtual-buffers nil)))
(defun iswitchb-get-matched-buffers (regexp
&optional string-format buffer-list)
@@ -1192,6 +1217,25 @@
contents
(not minibuffer-completion-confirm)))))))
+(defun iswitchb-remember-file ()
+ (if (and buffer-file-name
+ (file-exists-p buffer-file-name))
+ (let* ((name (file-name-nondirectory buffer-file-name))
+ (virt (assoc name iswitchb-virtual-buffer-alist)))
+ (if virt
+ (setcdr virt buffer-file-name)
+ (setq iswitchb-virtual-buffer-alist
+ (cons (cons name buffer-file-name)
+ iswitchb-virtual-buffer-alist))))))
+
+(defun iswitchb-virtual-buffer-predicate (entry)
+ (let ((name (car entry)))
+ (and (or (and iswitchb-regexp (string-match iswitchb-text name))
+ (and (null iswitchb-regexp)
+ (string-match (regexp-quote iswitchb-text) name)))
+ (not (iswitchb-ignore-buffername-p name))
+ (file-exists-p (cdr entry)))))
+
(defun iswitchb-output-completion (com)
(if (= (length com) most-len)
;; Most is one exact match,
@@ -1225,6 +1273,23 @@
first)
(setq comps (cons first (cdr comps)))))
+ ;; If no buffers matched, and virtual buffers are being used, then
+ ;; consult the list of past visited files, to see if we can find
+ ;; the file which the user might thought was still open.
+ (if (and iswitchb-use-virtual-buffers (null comps)
+ iswitchb-virtual-buffer-alist)
+ (progn
+ (setq iswitchb-virtual-buffers
+ (all-completions "" iswitchb-virtual-buffer-alist
+ 'iswitchb-virtual-buffer-predicate)
+ comps iswitchb-virtual-buffers)
+ (let ((comp comps))
+ (while comp
+ (put-text-property 0 (length (car comp))
+ 'face 'font-lock-builtin-face
+ (car comp))
+ (setq comp (cdr comp))))))
+
(cond ((null comps) (format " %sNo match%s"
open-bracket-determined
close-bracket-determined))
- Patch for "virtual buffers" in iswitchb,
John Wiegley <=