change: add a pass list and some filters

* ibuffer.el (dashboard-buffer-name): to be added to the pass list.

(durand-clear-passlist): Buffer names listed in this variable will not
be deleted automatically.

(durand-ibuffer-clear): Do not delete those buffers whose names are a
member of `durand-clear-passlist'.

(durand-directory): a filter for matching files whose associated files
are in a subdirectory of the qualifier.  This needs more testing,
though.

(durand-bongo-set-filter): Add groups for C, ELisp, EWW, and Roman.

1 files changed, 50 insertions, 8 deletions

diff --git a/ibuffer.el b/ibuffer.el
index 93f6ccd..e1cf4ec 100644
--- a/ibuffer.el
+++ b/ibuffer.el
@@ -3,8 +3,8 @@
 (require 'ibuffer)
 (require 'ibuf-ext)
 
-(setq ibuffer-expert t
-      ibuffer-display-summary nil)
+(setq ibuffer-expert t)
+(setq ibuffer-display-summary nil)
 
 (setq ibuffer-show-empty-filter-groups nil)
 
@@ -74,22 +74,40 @@ If the optional ARG is non-nil, then produce an IBUFFER buffer
                  (buffer-local-value 'major-mode (current-buffer))))))))
 
 ;;;###autoload
+(defvar durand-clear-passlist nil
+  "The list of buffers that should not be deleted \
+automatically.")
+
+;; from dashboard.el
+(defvar dashboard-buffer-name)
+
+(cond
+ ((null dashboard-buffer-name)
+  (setq dashboard-buffer-name "")))
+
+(setq durand-clear-passlist
+      (list dashboard-buffer-name
+            "*Group*"
+            ".newsrc-dribble"))
+
+;;;###autoload
 (defun durand-ibuffer-clear (&optional arg)
-  "Kill every buffer except for the dashboard.
+  "Kill every buffer except for those in `durand-clear-passlist'.
 If the optional ARG is non-nil, then kill every buffer except for
 those that are marked."
   (interactive "P")
   (cond
    ((derived-mode-p 'ibuffer-mode))
    ((user-error "durand-ibuffer-clear should only be used in \
-derived modes of ibuffer-mode.")))
+derived modes of `ibuffer-mode'.")))
   (cond
    ((null arg)
     (mapc (function
            (lambda (buffer)
              (cond
-              ((string= (buffer-name buffer)
-                        dashboard-buffer-name))
+              ((durand-member (buffer-name buffer)
+                              durand-clear-passlist
+                              #'string=))
               ((kill-buffer buffer)))))
           (cons
            (current-buffer)
@@ -144,12 +162,36 @@ derived modes of ibuffer-mode.")))
      ((derived-mode-p 'bongo-playlist-mode 'bongo-library-mode)))))
 
 ;;;###autoload
+(define-ibuffer-filter durand-directory
+    "Limit current view to buffers with directory a subdirectory of \
+QUALIFIER.
+
+For a buffer not associated with a file, this matches against the
+value of `default-directory' in that buffer."
+  (:description "directory name"
+   :reader (read-from-minibuffer "Filter by directory name (regex): "))
+  (ibuffer-aif (with-current-buffer buf (ibuffer-buffer-file-name))
+      (let ((dirname (expand-file-name (file-name-directory it))))
+        (when dirname
+          (string-match-p
+           (expand-file-name qualifier)
+           dirname)))
+    (when (with-current-buffer buf default-directory)
+      (string-match-p (expand-file-name qualifier)
+                      (expand-file-name
+                       (with-current-buffer buf
+                         default-directory))))))
+
+;;;###autoload
 (defun durand-bongo-set-filter ()
   "Set my custom filters."
   (interactive)
   (setq ibuffer-filter-groups
-        (cons (cons "Bongo" '((durand-bongo)))
-              ibuffer-filter-groups))
+        (list (cons "Bongo" '((durand-bongo)))
+              (cons "C" '((mode . c-mode)))
+              (cons "ELisp" '((mode . emacs-lisp-mode)))
+              (cons "EWW" '((mode . eww-mode)))
+              (cons "Roman" '((mode . novel-read-mode)))))
   (let ((ibuf (get-buffer "*Ibuffer*")))
     (when ibuf
       (with-current-buffer ibuf