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* Patch for "virtual buffers" in iswitchb
@ 2004-04-18 11:13 John Wiegley
  2004-04-20 21:32 ` John Wiegley
  0 siblings, 1 reply; 3+ messages in thread
From: John Wiegley @ 2004-04-18 11:13 UTC (permalink / raw)
  Cc: emacs-devel

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))

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: Patch for "virtual buffers" in iswitchb
  2004-04-18 11:13 Patch for "virtual buffers" in iswitchb John Wiegley
@ 2004-04-20 21:32 ` John Wiegley
  2004-04-30 11:41   ` John Wiegley
  0 siblings, 1 reply; 3+ messages in thread
From: John Wiegley @ 2004-04-20 21:32 UTC (permalink / raw)


After receiving an e-mail from the author of recentf -- which is
already part of the Emacs distribution and handles maintenance of a
list of "recently opened files" -- I've altered the virtual buffers
patch to iswitchb.el to use that package instead of doing the work
itself:

--- iswitchb.el	18 Apr 2004 03:28:12 -0700	1.48
+++ iswitchb.el	20 Apr 2004 14:30:00 -0700	
@@ -305,6 +305,20 @@
   :type 'integer
   :group 'iswitchb)
 
+(defcustom iswitchb-use-virtual-buffers nil
+  "*If non-nil, refer to past buffers when none match.
+This feature relies upon the `recentf' package, which will be
+enabled if this variable is configured to a non-nil value."
+  :type 'boolean
+  :require 'recentf
+  :set (function
+	(lambda (sym value)
+	  (recentf-mode value)
+	  (set sym value)))
+  :group 'iswitchb)
+
+(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 +627,16 @@
     (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
+	     iswitchb-virtual-buffers
+	     (not (iswitchb-existing-buffer-p)))
+	(let ((virt (car iswitchb-virtual-buffers)))
+	  (find-file-noselect virt)
+	  (setq iswitchb-matches (list (file-name-nondirectory 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 +856,8 @@
       (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)
@@ -1225,6 +1253,33 @@
 			     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.
+    (when (and iswitchb-use-virtual-buffers (null comps)
+	       recentf-list)
+      (setq iswitchb-virtual-buffers nil)
+      (let ((head recentf-list) name)
+	(while head
+	  (if (and (null (find-buffer-visiting (car head)))
+		   (setq name (file-name-nondirectory (car head)))
+		   (or (if iswitchb-regexp
+			   (string-match iswitchb-text name))
+		       (string-match (regexp-quote iswitchb-text) name))
+		   (not (iswitchb-ignore-buffername-p name))
+		   (file-exists-p (car head)))
+	      (setq iswitchb-virtual-buffers
+		    (cons (car head) iswitchb-virtual-buffers)))
+	  (setq head (cdr head)))
+	(setq comps (mapcar 'file-name-nondirectory
+			    (nreverse 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))

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: Patch for "virtual buffers" in iswitchb
  2004-04-20 21:32 ` John Wiegley
@ 2004-04-30 11:41   ` John Wiegley
  0 siblings, 0 replies; 3+ messages in thread
From: John Wiegley @ 2004-04-30 11:41 UTC (permalink / raw)


I just mailed off the general assignment papers, so soon I can check
the following patch in.  But I wanted to post this new version anyway,
since it runs many, many times faster than the previous patch, and
also represents what I hope is the final state of the code to be
checked in.

I've been relying heavily on this feature since writing it, so I
believe it can be quite useful to current iswitchb users.

John

Index: iswitchb.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/iswitchb.el,v
retrieving revision 1.51
diff -w -U3 -r1.51 iswitchb.el
--- iswitchb.el	21 Apr 2004 09:47:11 -0000	1.51
+++ iswitchb.el	30 Apr 2004 11:38:10 -0000
@@ -307,6 +307,20 @@
   :type '(choice (const :tag "Show all" nil) integer)
   :group 'iswitchb)
 
+(defcustom iswitchb-use-virtual-buffers nil
+  "*If non-nil, refer to past buffers when none match.
+This feature relies upon the `recentf' package, which will be
+enabled if this variable is configured to a non-nil value."
+  :type 'boolean
+  :require 'recentf
+  :set (function
+	(lambda (sym value)
+	  (recentf-mode value)
+	  (set sym value)))
+  :group 'iswitchb)
+
+(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
@@ -572,12 +586,18 @@
 	   ))))
 
 ;;;###autoload
-(defun iswitchb-read-buffer (prompt &optional default require-match)
+(defun iswitchb-read-buffer (prompt &optional default require-match
+				    start matches-set)
   "Replacement for the built-in `read-buffer'.
 Return the name of a buffer selected.
-PROMPT is the prompt to give to the user.  DEFAULT if given is the default
-buffer to be selected, which will go to the front of the list.
-If REQUIRE-MATCH is non-nil, an existing-buffer must be selected."
+PROMPT is the prompt to give to the user.
+DEFAULT if given is the default buffer to be selected, which will
+go to the front of the list.
+If REQUIRE-MATCH is non-nil, an existing-buffer must be selected.
+If START is a string, the selection process is started with that
+string.
+If MATCHES-SET is non-nil, the buflist is not updated before
+the selection process begins.  Used by isearchb.el."
   (let
       (
        buf-sel
@@ -590,14 +610,15 @@
 
     (iswitchb-define-mode-map)
     (setq iswitchb-exit nil)
-    (setq iswitchb-rescan t)
-    (setq iswitchb-text "")
     (setq iswitchb-default
 	  (if (bufferp default)
 	      (buffer-name default)
 	    default))
+    (setq iswitchb-text (or start ""))
+    (unless matches-set
+      (setq iswitchb-rescan t)
     (iswitchb-make-buflist iswitchb-default)
-    (iswitchb-set-matches)
+      (iswitchb-set-matches))
     (let
 	((minibuffer-local-completion-map iswitchb-mode-map)
 	 ;; Record the minibuffer depth that we expect to find once
@@ -610,19 +631,29 @@
 				 '(("dummy" . 1)) ;table
 				 nil	;predicate
 				 nil	;require-match [handled elsewhere]
-				 nil	;initial-contents
+				 start	;initial-contents
 				 'iswitchb-history)))
     (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 no buffer matched, but a virtual buffer was selected, visit
+    ;; that file now and act as though that buffer had been selected.
+    (if (and iswitchb-virtual-buffers
+	     (not (iswitchb-existing-buffer-p)))
+	(let ((virt (car iswitchb-virtual-buffers)))
+	  (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)))
+    (if (and require-match
+	     (not (iswitchb-existing-buffer-p)))
 	(error "Must specify valid buffer"))
 
-    (if (or
-	 (eq iswitchb-exit 'takeprompt)
+    (if (or (eq iswitchb-exit 'takeprompt)
 	 (null iswitchb-matches))
 	(setq buf-sel iswitchb-final-text)
       ;; else take head of list
@@ -732,18 +762,29 @@
   (setq iswitchb-exit 'findfile)
   (exit-minibuffer))
 
+(eval-when-compile
+  (defvar recentf-list))
+
 (defun iswitchb-next-match ()
   "Put first element of `iswitchb-matches' at the end of the list."
   (interactive)
   (let ((next  (cadr iswitchb-matches)))
-    (setq iswitchb-buflist (iswitchb-chop iswitchb-buflist next))
+    (if (and (null next) iswitchb-virtual-buffers)
+	(setq recentf-list
+	      (iswitchb-chop recentf-list
+			     (cdr (cadr iswitchb-virtual-buffers))))
+      (setq iswitchb-buflist (iswitchb-chop iswitchb-buflist next)))
     (setq iswitchb-rescan t)))
 
 (defun iswitchb-prev-match ()
   "Put last element of `iswitchb-matches' at the front of the list."
   (interactive)
   (let ((prev  (car (last iswitchb-matches))))
-    (setq iswitchb-buflist (iswitchb-chop iswitchb-buflist prev))
+    (if (and (null prev) iswitchb-virtual-buffers)
+	(setq recentf-list
+	      (iswitchb-chop recentf-list
+			     (cdr (car (last iswitchb-virtual-buffers)))))
+      (setq iswitchb-buflist (iswitchb-chop iswitchb-buflist prev)))
     (setq iswitchb-rescan t)))
 
 (defun iswitchb-chop (list elem)
@@ -835,7 +876,8 @@
       (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)
@@ -1227,6 +1273,35 @@
 			     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.
+    (when (and iswitchb-use-virtual-buffers (null comps)
+	       recentf-list)
+      (setq iswitchb-virtual-buffers nil)
+      (let ((head recentf-list) name)
+	(while head
+	  (if (and (setq name (file-name-nondirectory (car head)))
+		   (string-match (if iswitchb-regexp
+				     iswitchb-text
+				   (regexp-quote iswitchb-text)) name)
+		   (null (get-file-buffer (car head)))
+		   (not (assoc name iswitchb-virtual-buffers))
+		   (not (iswitchb-ignore-buffername-p name))
+		   (file-exists-p (car head)))
+	      (setq iswitchb-virtual-buffers
+		    (cons (cons name (car head))
+			  iswitchb-virtual-buffers)))
+	  (setq head (cdr head)))
+	(setq iswitchb-virtual-buffers (nreverse iswitchb-virtual-buffers)
+	      comps (mapcar 'car 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))

^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2004-04-30 11:41 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2004-04-18 11:13 Patch for "virtual buffers" in iswitchb John Wiegley
2004-04-20 21:32 ` John Wiegley
2004-04-30 11:41   ` John Wiegley

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