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;;; world-time-mode.el --- show whole days of world-time diffs
;; Copyright (C) 2013 Nic Ferrier
;; Author: Nic Ferrier <nferrier@ferrier.me.uk>
;; Keywords: tools, calendar
;; Version: 0.0.6
;; This program 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.
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Very useful productivity tool if you work in different time zones.
;;; Code:
(require 'cl)
(require 'time)
(defun world-time/zone-list (this-time)
"Return the vector of zoned times for TIME."
(apply 'vector
(mapcar
(lambda (zone)
(let ((original (getenv "TZ")))
(unwind-protect
(progn
(setenv "TZ" (car zone))
(list (format-time-string "%R %Z" this-time)))
(setenv "TZ" original))))
display-time-world-list)))
(defun world-time/table-entrys ()
"Make the entry table for the list.
Based on the next hour after the current time."
(let* ((currently (current-time))
(time-now (time-to-seconds currently))
(hours-since-epoch (/ time-now 3600))
(last-hour (* 3600.00 (floor hours-since-epoch)))
(next-hour (+ 3600.00 last-hour))
(ref-time (seconds-to-time next-hour))
(ref-list
(mapcar
(lambda (i)
(list nil
(world-time/zone-list
(time-add ref-time (seconds-to-time (* 3600.00 i))))))
(number-sequence 0 23))))
(append (list (list nil (world-time/zone-list currently))) ref-list)))
(define-derived-mode
world-time-table-mode tabulated-list-mode "World Time"
"Major mode for seeing your world time list as a day."
(setq tabulated-list-entries 'world-time/table-entrys)
;; This is wrong! it needs to be derived from display-time-world-list
(setq tabulated-list-format
(loop for time in display-time-world-list
vconcat (list (list (car time) 20 nil))))
(tabulated-list-init-header))
;;;###autoload
(defun world-time-list ()
"Show `display-time-world-list' full day comparison."
(interactive)
(with-current-buffer (get-buffer-create "*world-time*")
(world-time-table-mode)
(tabulated-list-print)
(switch-to-buffer (current-buffer))))
;;;###autoload
(defun list-world-time ()
"Show `display-time-world-list' full day comparison."
(interactive)
(call-interactively 'world-time-list))
(provide 'world-time-mode)
;;; world-time-mode.el ends here
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