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;;; timer-list.el --- list active timers in a buffer -*- lexical-binding:t -*-
;; Copyright (C) 2016-2025 Free Software Foundation, Inc.
;; Maintainer: emacs-devel@gnu.org
;; Package: emacs
;; 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 3 of the License, 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. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(defvar cl-print-compiled)
(defvar cl-print-compiled-button)
;;;###autoload
(defun list-timers (&optional _ignore-auto _nonconfirm)
"List all timers in a buffer."
(interactive)
(pop-to-buffer-same-window (get-buffer-create "*timer-list*"))
(timer-list-mode)
(tabulated-list-init-header)
(setq tabulated-list-entries
(mapcar
(lambda (timer)
(list
nil
`[ ;; Idle.
,(propertize
(if (aref timer 7) " *" " ")
'help-echo "* marks idle timers"
'timer timer)
;; Next time.
,(propertize
(let ((time (list (aref timer 1)
(aref timer 2)
(aref timer 3))))
(format "%12s"
(format-seconds "%dd %hh %mm %z%,1ss"
(float-time
(if (aref timer 7)
time
(time-subtract time nil))))))
'help-echo "Time until next invocation")
;; Repeat.
,(let ((repeat (aref timer 4)))
(cond
((numberp repeat)
(propertize
(format "%12s" (format-seconds
"%x%dd %hh %mm %z%,1ss" repeat))
'help-echo "Repeat interval"))
((null repeat)
(propertize " -" 'help-echo "Runs once"))
(t
(format "%12s" repeat))))
;; Function.
,(propertize
(let ((cl-print-compiled 'static)
(cl-print-compiled-button nil)
(print-escape-newlines t))
(cl-prin1-to-string (aref timer 5)))
'help-echo "Function called by timer")]))
(append timer-list timer-idle-list)))
(tabulated-list-print))
;; This command can be destructive if they don't know what they are
;; doing. Kids, don't try this at home!
;;;###autoload (put 'list-timers 'disabled "Beware: manually canceling timers can ruin your Emacs session.")
(defvar-keymap timer-list-mode-map
"c" #'timer-list-cancel
:menu
'("Timers"
["Cancel" timer-list-cancel t]
["Quit" quit-window]))
(define-derived-mode timer-list-mode tabulated-list-mode "Timer-List"
"Mode for listing and controlling timers."
(buffer-disable-undo)
(setq-local revert-buffer-function #'list-timers)
(setq tabulated-list-format
'[("Idle" 6 timer-list--idle-predicate)
("Next" 12 timer-list--next-predicate :right-align t :pad-right 1)
("Repeat" 12 timer-list--repeat-predicate :right-align t :pad-right 1)
("Function" 10 timer-list--function-predicate)]))
(defun timer-list--idle-predicate (A B)
"Predicate to sort Timer-List by the Idle column."
(let ((iA (aref (cadr A) 0))
(iB (aref (cadr B) 0)))
(cond ((string= iA iB)
(timer-list--next-predicate A B))
((string= iA " *") nil)
(t t))))
(defun timer-list--next-predicate (A B)
"Predicate to sort Timer-List by the Next column."
(let ((nA (string-to-number (aref (cadr A) 1)))
(nB (string-to-number (aref (cadr B) 1))))
(< nA nB)))
(defun timer-list--repeat-predicate (A B)
"Predicate to sort Timer-List by the Repeat column."
(let ((rA (aref (cadr A) 2))
(rB (aref (cadr B) 2)))
(string< rA rB)))
(defun timer-list--function-predicate (A B)
"Predicate to sort Timer-List by the Function column."
(let ((fA (aref (cadr A) 3))
(fB (aref (cadr B) 3)))
(string< fA fB)))
(defun timer-list-cancel ()
"Cancel the timer on the line under point."
(interactive)
(let ((timer (get-text-property (line-beginning-position) 'timer))
(inhibit-read-only t))
(unless timer
(error "No timer on the current line"))
(cancel-timer timer)
(delete-region (line-beginning-position)
(line-beginning-position 2))))
(provide 'timer-list)
;;; timer-list.el ends here
|
