;;; time-date.el --- Date and time handling functions
-;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
-;; Free Software Foundation, Inc.
+;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
+;; 2007, 2008, 2009 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Masanobu Umeda <umerin@mse.kyutech.ac.jp>
;; This file is part of GNU Emacs.
-;; GNU Emacs is free software; you can redistribute it and/or modify
+;; 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, or (at your option)
-;; any later version.
+;; 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
+;; 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; see the file COPYING. If not, write to the
-;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
+;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
+;; Only necessary for `declare' when compiling Gnus with Emacs 21.
+(eval-when-compile (require 'cl))
+
(defmacro with-decoded-time-value (varlist &rest body)
"Decode a time value and bind it according to VARLIST, then eval BODY.
;;;###autoload
(defun date-to-time (date)
- "Parse a string that represents a date-time and return a time value."
+ "Parse a string DATE that represents a date-time and return a time value."
(condition-case ()
(apply 'encode-time
(parse-time-string
(timezone-make-date-arpa-standard date)))
(error (error "Invalid date: %s" date))))
+;;;###autoload
(defun time-to-seconds (time)
"Convert time value TIME to a floating point number.
You can use `float-time' instead."
;;;###autoload
(defun time-subtract (t1 t2)
- "Subtract two time values.
+ "Subtract two time values, T1 minus T2.
Return the difference in the format of a time value."
(with-decoded-time-value ((high low micro type t1)
(high2 low2 micro2 type2 t2))
;;;###autoload
(defun time-add (t1 t2)
- "Add two time values. One should represent a time difference."
+ "Add two time values T1 and T2. One should represent a time difference."
(with-decoded-time-value ((high low micro type t1)
(high2 low2 micro2 type2 t2))
(setq high (+ high high2)
;;;###autoload
(defun time-to-day-in-year (time)
- "Return the day number within the year of the date month/day/year."
+ "Return the day number within the year corresponding to TIME."
(let* ((tim (decode-time time))
(month (nth 4 tim))
(day (nth 3 tim))
;;;###autoload
(defun safe-date-to-time (date)
- "Parse a string that represents a date-time and return a time value.
+ "Parse a string DATE that represents a date-time and return a time value.
If DATE is malformed, return a time value of zeros."
(condition-case ()
(date-to-time date)
(error '(0 0))))
+\f
+;;;###autoload
+(defun format-seconds (string seconds)
+ "Use format control STRING to format the number SECONDS.
+The valid format specifiers are:
+%y is the number of (365-day) years.
+%d is the number of days.
+%h is the number of hours.
+%m is the number of minutes.
+%s is the number of seconds.
+%z is a non-printing control flag (see below).
+%% is a literal \"%\".
+
+Upper-case specifiers are followed by the unit-name (e.g. \"years\").
+Lower-case specifiers return only the unit.
+
+\"%\" may be followed by a number specifying a width, with an
+optional leading \".\" for zero-padding. For example, \"%.3Y\" will
+return something of the form \"001 year\".
+
+The \"%z\" specifier does not print anything. When it is used, specifiers
+must be given in order of decreasing size. To the left of \"%z\", nothing
+is output until the first non-zero unit is encountered.
+
+This function does not work for SECONDS greater than `most-positive-fixnum'."
+ (let ((start 0)
+ (units '(("y" "year" 31536000)
+ ("d" "day" 86400)
+ ("h" "hour" 3600)
+ ("m" "minute" 60)
+ ("s" "second" 1)
+ ("z")))
+ (case-fold-search t)
+ spec match usedunits zeroflag larger prev name unit num zeropos)
+ (while (string-match "%\\.?[0-9]*\\(.\\)" string start)
+ (setq start (match-end 0)
+ spec (match-string 1 string))
+ (unless (string-equal spec "%")
+ ;; `assoc-string' is not available in Emacs 21. So when compiling
+ ;; Gnus (`time-date.el' is part of Gnus) with Emacs 21, we get a
+ ;; warning here. But `format-seconds' is not used anywhere in Gnus so
+ ;; it's not a real problem. --rsteib
+ (or (setq match (assoc-string spec units t))
+ (error "Bad format specifier: `%s'" spec))
+ (if (assoc-string spec usedunits t)
+ (error "Multiple instances of specifier: `%s'" spec))
+ (if (string-equal (car match) "z")
+ (setq zeroflag t)
+ (unless larger
+ (setq unit (nth 2 match)
+ larger (and prev (> unit prev))
+ prev unit)))
+ (push match usedunits)))
+ (and zeroflag larger
+ (error "Units are not in decreasing order of size"))
+ (dolist (u units)
+ (setq spec (car u)
+ name (cadr u)
+ unit (nth 2 u))
+ (when (string-match (format "%%\\(\\.?[0-9]+\\)?\\(%s\\)" spec) string)
+ (if (string-equal spec "z") ; must be last in units
+ (setq string
+ (replace-regexp-in-string
+ "%z" ""
+ (substring string (min (or zeropos (match-end 0))
+ (match-beginning 0)))))
+ ;; Cf article-make-date-line in gnus-art.
+ (setq num (floor seconds unit)
+ seconds (- seconds (* num unit)))
+ ;; Start position of the first non-zero unit.
+ (or zeropos
+ (setq zeropos (unless (zerop num) (match-beginning 0))))
+ (setq string
+ (replace-match
+ (format (concat "%" (match-string 1 string) "d%s") num
+ (if (string-equal (match-string 2 string) spec)
+ "" ; lower-case, no unit-name
+ (format " %s%s" name
+ (if (= num 1) "" "s"))))
+ t t string))))))
+ (replace-regexp-in-string "%%" "%" string))
+
+
(provide 'time-date)
-;;; arch-tag: addcf07b-b20a-465b-af72-550b8ac5190f
+;; arch-tag: addcf07b-b20a-465b-af72-550b8ac5190f
;;; time-date.el ends here