diff --git a/.emacs.d/lisp/package-cl-inspect-mode.el b/.emacs.d/lisp/package-cl-inspect-mode.el
index 7fedeaa5..382c4d9c 100644
--- a/.emacs.d/lisp/package-cl-inspect-mode.el
+++ b/.emacs.d/lisp/package-cl-inspect-mode.el
@@ -35,12 +35,79 @@ If ENTRY element at INDEX is a number, sort by number, otherwise sort by string.
                                     (clinspect--tabulated-list-sorter (car entries) index))))
                           (number-sequence 0 (1- (length header))))))
 
+(defun clinspect--vector->list (vector)
+  (cl-loop for i from 0 below (length vector)
+           collect (aref vector i)))
+
+(defun clinspect--test-filter (entry)
+  (let ((path (aref (cadr entry) 0)))
+    (string-match-p "agenda" path)))
+
+(defvar clinspect-filters (list #'identity))
+(setq clinspect-filters (list #'clinspect--test-filter))
+
+(defun clinspect--filter-column (index predicate)
+  (lambda (entry)
+    (let ((value (aref (cadr entry) index)))
+      (funcall predicate value))))
+
+(defun clinspect--number-filter (index)
+  (let ((min (read-from-minibuffer "Min value (empty means none): " nil nil :read nil "nil"))
+        (max (read-from-minibuffer "Max value (empty means none): " nil nil :read nil "nil"))
+        (number (string-to-number value)))
+    (clinspect--filter-column
+     index
+     (lambda (value)
+       (cond
+        ((and min max)
+         (<= min number max))
+        (min
+         (<= min number ))
+        (max
+         (<= number max)))))))
+
+(defun clinspect-add-filter ()
+  (interactive)
+  (let* ((column-names (mapcar #'car (clinspect--vector->list tabulated-list-format)))
+         (column (completing-read "Column to filter by: " column-names))
+         (index (cl-position column column-names :test #'equal))
+         (sample (aref (cadr (car clinspect--tabulated-list-entries)) index))
+         (revert? t))
+    (cl-typecase (car (read-from-string sample))
+      (integer
+       (add-to-list 'clinspect-filters (clinspect--number-filter index)))
+      (t (message "Unsupported column values to infer filter.")
+         (setq revert? nil)))
+
+    (when revert?
+      (tabulated-list-revert))))
+
+(defun clinspect-reset-filters ()
+  (interactive)
+  (setq clinspect-filters (list #'identity))
+  (tabulated-list-revert))
+
+(defun clinspect--refresh ()
+  ;; TODO: Use -orfn / -andfn?
+  (setq tabulated-list-entries
+        (cl-loop for entry in clinspect--tabulated-list-entries
+                 when (cl-loop for filter in clinspect-filters
+                               always (funcall filter entry))
+                 collect entry)
+        ;; (clinspect-filter
+        ;;  clinspect--tabulated-list-entries)
+        )
+  (tabulated-list-init-header))
+
 (define-derived-mode clinspect-mode tabulated-list-mode "Clinspect"
   "Mode to inspect Common Lisp sequences."
-  (add-hook 'tabulated-list-revert-hook 'tabulated-list-init-header nil t))
+  (add-hook 'tabulated-list-revert-hook 'clinspect--refresh nil t))
 
 (defvar clinspect-buffer-name "clinspector")
 
+(defvar-local clinspect--tabulated-list-entries nil
+  "Backup of `tabulated-list-entries', in case the latter gets filtered.")
+
 (defun clinspect (header data &optional name)
   "Inspect DATA.
 DATA is a list of things.
@@ -51,7 +118,7 @@ HEADER is a list of strings, the column names."
                                     (format "<%s>" name)
                                   ""))))
   (clinspect-mode)
-  (setq tabulated-list-entries
+  (setq clinspect--tabulated-list-entries
         (cl-loop for line in data
                  for index from 1 upto (length header)
                  collect (list index (apply #'vector (mapcar #'prin1-to-string line)))))