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;;; timer-list.el --- list active timers in a buffer -*- lexical-binding:t -*-
;; Copyright (C) 2016-2020 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*"))
(let ((inhibit-read-only t))
(erase-buffer)
(timer-list-mode)
(dolist (timer (append timer-list timer-idle-list))
(insert (format "%4s %10s %8s %s"
;; Idle.
(if (aref timer 7) "*" " ")
;; Next time.
(let ((time (list (aref timer 1)
(aref timer 2)
(aref timer 3))))
(format "%.2f"
(float-time
(if (aref timer 7)
time
(time-subtract time nil)))))
;; Repeat.
(let ((repeat (aref timer 4)))
(cond
((numberp repeat)
(format "%.2f" (/ repeat 60)))
((null repeat)
"-")
(t
(format "%s" repeat))))
;; Function.
(let ((cl-print-compiled 'static)
(cl-print-compiled-button nil)
(print-escape-newlines t))
(cl-prin1-to-string (aref timer 5)))))
(put-text-property (line-beginning-position)
(1+ (line-beginning-position))
'timer timer)
(insert "\n")))
(goto-char (point-min)))
;; 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 timer-list-mode-map
(let ((map (make-sparse-keymap)))
(define-key map "c" 'timer-list-cancel)
(define-key map "n" 'next-line)
(define-key map "p" 'previous-line)
(easy-menu-define nil map ""
'("Timers"
["Cancel" timer-list-cancel t]))
map))
(define-derived-mode timer-list-mode special-mode "Timer-List"
"Mode for listing and controlling timers."
(setq bidi-paragraph-direction 'left-to-right)
(setq truncate-lines t)
(buffer-disable-undo)
(setq-local revert-buffer-function #'list-timers)
(setq buffer-read-only t)
(setq header-line-format
(concat (propertize " " 'display '(space :align-to 0))
(format "%4s %10s %8s %s"
"Idle" "Next" "Repeat" "Function"))))
(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
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