0357fa2632
This prevents LANG= in an included file from affecting the interpretation of month and day names in the including file. Make the internal pre-processor accept white space between the "#" at the start of the line and the keyword for better compatibility with cpp. Add support for the cpp keywords #warning and #error. MFC after: 3 days
375 lines
12 KiB
Groff
375 lines
12 KiB
Groff
.\" Copyright (c) 1989, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)calendar.1 8.1 (Berkeley) 6/29/93
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.\" $FreeBSD$
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.\"
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.Dd November 5, 2020
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.Dt CALENDAR 1
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.Os
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.Sh NAME
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.Nm calendar
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.Nd reminder service
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.Sh SYNOPSIS
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.Nm
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.Op Fl A Ar num
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.Op Fl a
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.Op Fl B Ar num
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.Op Fl D Ar moon|sun
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.Op Fl d
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.Op Fl F Ar friday
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.Op Fl f Ar calendarfile
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.Op Fl l Ar longitude
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.Oo
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.Bk -words
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.Fl t Ar dd Ns
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.Sm off
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.Op . Ar mm Op . Ar year
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.Sm on
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.Ek
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.Oc
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.Op Fl U Ar UTC-offset
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.Op Fl W Ar num
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.Sh DESCRIPTION
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The
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.Nm
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utility checks the current directory for a file named
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.Pa calendar
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and displays lines that fall into the specified date range.
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On the day before a weekend (normally Friday), events for the next
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three days are displayed.
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.Pp
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The following options are available:
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.Bl -tag -width Ds
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.It Fl A Ar num
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Print lines from today and the next
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.Ar num
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days (forward, future).
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.It Fl a
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Process the ``calendar'' files for users found in
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.Pa /etc/passwd
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and mail the results
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to them.
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This can result in multiple messages for specific files, since
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.Pa /etc/passwd
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does not require home directories to be unique.
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In particular, by default
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.Ar root ,
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.Ar toor
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and
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.Ar daemon
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share the same home directory.
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If this directory contains calendar information,
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.Nm
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will process the file three times.
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.Pp
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This option requires super-user privileges.
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.It Fl B Ar num
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Print lines from today and the previous
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.Ar num
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days (backward, past).
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.It Fl D Ar moon|sun
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Print UTC offset, longitude and moon or sun information.
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.It Fl d
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Debug option: print current date information.
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.It Fl F Ar friday
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Specify which day of the week is ``Friday'' (the day before the
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weekend begins).
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Default is 5.
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.It Fl f Pa calendarfile
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Use
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.Pa calendarfile
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as the default calendar file.
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.It Fl l Ar longitude
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Perform lunar and solar calculations from this longitude.
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If neither longitude nor UTC offset is specified, the calculations will
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be based on the difference between UTC time and localtime.
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If both are specified, UTC offset overrides longitude.
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.It Xo Fl t
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.Sm off
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.Ar dd
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.Op . Ar mm Op . Ar year
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.Sm on
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.Xc
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For test purposes only: set date directly to argument values.
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.It Fl U Ar UTC-offset
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Perform lunar and solar calculations from this UTC offset.
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If neither UTC offset nor longitude is specified, the calculations
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will be based on the difference between UTC time and localtime.
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If both are specified, UTC offset overrides longitude.
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.It Fl W Ar num
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Print lines from today and the next
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.Ar num
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days (forward, future).
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Ignore weekends when calculating the number of days.
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.El
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.Sh FILE FORMAT
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To handle calendars in your national code table you can specify
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.Dq LANG=<locale_name>
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in the calendar file as early as possible.
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.Pp
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To handle the local name of sequences, you can specify them as:
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.Dq SEQUENCE=<first> <second> <third> <fourth> <fifth> <last>
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in the calendar file as early as possible.
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.Pp
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The names of the following special days are recognized:
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.Bl -tag -width 123456789012345 -compact
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.It Easter
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Catholic Easter.
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.It Paskha
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Orthodox Easter.
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.It NewMoon
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The lunar New Moon.
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.It FullMoon
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The lunar Full Moon.
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.It MarEquinox
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The solar equinox in March.
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.It JunSolstice
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The solar solstice in June.
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.It SepEquinox
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The solar equinox in September.
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.It DecSolstice
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The solar solstice in December.
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.It ChineseNewYear
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The first day of the Chinese year.
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.El
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These names may be reassigned to their local names via an assignment
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like
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.Dq Easter=Pasen
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in the calendar file.
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.Pp
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Other lines should begin with a month and day.
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They may be entered in almost any format, either numeric or as character
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strings.
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If the proper locale is set, national month and weekday
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names can be used.
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A single asterisk (``*'') matches every month.
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A day without a month matches that day of every week.
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A month without a day matches the first of that month.
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Two numbers default to the month followed by the day.
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Lines with leading tabs default to the last entered date, allowing
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multiple line specifications for a single date.
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.Pp
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The names of the recognized special days may be followed by a
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positive or negative integer, like:
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.Dq Easter+3
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or
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.Dq Paskha-4 .
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.Pp
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Weekdays may be followed by ``-4'' ...\& ``+5'' (aliases for
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last, first, second, third, fourth) for moving events like
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``the last Monday in April''.
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.Pp
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By convention, dates followed by an asterisk are not fixed, i.e., change
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from year to year.
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.Pp
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Day descriptions start after the first <tab> character in the line;
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if the line does not contain a <tab> character, it is not displayed.
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If the first character in the line is a <tab> character, it is treated as
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a continuation of the previous line.
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.Pp
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The
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.Nm
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file is preprocessed by a limited subset of
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.Xr cpp 1
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internally, allowing the inclusion of shared files such as
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lists of company holidays or meetings.
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This limited subset consists of \fB#include\fR, \fB#define\fR,
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\fB#undef\fR, \fB#ifdef\fR, \fB#ifndef\fR, \fB#else\fR, \fB#warning\fR,
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and \fB#error\fR.
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.Pp
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Conditions can be nested and the consistency of opening and closing
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instructions is checked.
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Only the first word after #define is used as the name of the
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condition variable being defined.
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More than word following #ifdef, #ifndef, or #undef is considered a syntax
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error, since names cannot include white-space.
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Included files are parsed in a global scope with regard to the condition
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variables being defined or tested therein.
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All conditional blocks are implicitly closed at the end of a file,
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and missing #endif instructions are assumed to be present on implied
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succeeding lines.
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.Pp
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If the shared file is not referenced by a full pathname,
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.Nm
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searches in the current (or home) directory first, and then in the
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directory
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.Pa /usr/share/calendar .
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Empty lines and text protected by the C commenting syntax
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.Pq Li /* ... */
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or
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.Pq Li //
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are ignored.
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.Pp
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Some possible calendar entries (<tab> characters highlighted by
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\fB\et\fR sequence):
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.Bd -unfilled -offset indent
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LANG=C
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Easter=Ostern
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#include <calendar.usholiday>
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#include <calendar.birthday>
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6/15\fB\et\fRJune 15 (if ambiguous, will default to month/day).
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Jun. 15\fB\et\fRJune 15.
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15 June\fB\et\fRJune 15.
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Thursday\fB\et\fREvery Thursday.
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June\fB\et\fREvery June 1st.
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15 *\fB\et\fR15th of every month.
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2010/4/15\fB\et\fR15 April 2010
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May Sun+2\fB\et\fRsecond Sunday in May (Muttertag)
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04/SunLast\fB\et\fRlast Sunday in April,
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\fB\et\fRsummer time in Europe
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Easter\fB\et\fREaster
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Ostern-2\fB\et\fRGood Friday (2 days before Easter)
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Paskha\fB\et\fROrthodox Easter
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.Ed
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.Sh FILES
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.Bl -tag -width calendar.christian -compact
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.It Pa calendar
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file in current directory.
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.It Pa ~/.calendar
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.Pa calendar
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HOME directory.
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A chdir is done into this directory if it exists.
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.It Pa ~/.calendar/calendar
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calendar file to use if no calendar file exists in the current directory.
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.It Pa ~/.calendar/nomail
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do not send mail if this file exists.
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.It Pa /usr/share/calendar
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system wide location of calendar files provided as part of the base system.
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.It Pa /usr/local/share/calendar
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system wide location for calendar files provided by a port or package.
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.El
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.Pp
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The order of precedence in searches for a calendar file is:
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current directory, ~/.calendar, /usr/local/share/calendar, /usr/share/calendar.
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Files of similar names are ignored in lower precedence locations.
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.Pp
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The following default calendar files are provided by the
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deskutils/calendar-data port.
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.Pp
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.Bl -tag -width calendar.southafrica -compact
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.It Pa calendar.all
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File which includes all the default files.
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.It Pa calendar.australia
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Calendar of events in Australia.
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.It Pa calendar.birthday
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Births and deaths of famous (and not-so-famous) people.
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.It Pa calendar.christian
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Christian holidays.
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This calendar should be updated yearly by the local system administrator
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so that roving holidays are set correctly for the current year.
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.It Pa calendar.computer
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Days of special significance to computer people.
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.It Pa calendar.croatian
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Calendar of events in Croatia.
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.It Pa calendar.dutch
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Calendar of events in the Netherlands.
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.It Pa calendar.freebsd
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Birthdays of
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.Fx
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committers.
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.It Pa calendar.french
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Calendar of events in France.
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.It Pa calendar.german
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Calendar of events in Germany.
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.It Pa calendar.history
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Everything else, mostly U.S.\& historical events.
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.It Pa calendar.holiday
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Other holidays, including the not-well-known, obscure, and
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.Em really
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obscure.
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.It Pa calendar.judaic
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Jewish holidays.
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The entries for this calendar have been obtained from the
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deskutils/hebcal port.
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.It Pa calendar.music
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Musical events, births, and deaths.
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Strongly oriented toward rock 'n' roll.
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.It Pa calendar.newzealand
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Calendar of events in New Zealand.
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.It Pa calendar.russian
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Russian calendar.
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.It Pa calendar.southafrica
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Calendar of events in South Africa.
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.It Pa calendar.usholiday
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U.S.\& holidays.
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This calendar should be updated yearly by the local system administrator
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so that roving holidays are set correctly for the current year.
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.It Pa calendar.world
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Includes all calendar files except for national files.
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.El
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.Sh COMPATIBILITY
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The
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.Nm
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program previously selected lines which had the correct date anywhere
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in the line.
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This is no longer true, the date is only recognized when it occurs
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at the beginning of a line.
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.Sh SEE ALSO
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.Xr at 1 ,
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.Xr mail 1 ,
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.Xr cron 8
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.Sh HISTORY
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A
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.Nm
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command appeared in
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.At v7 .
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.Sh NOTES
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Chinese New Year is calculated at 120 degrees east of Greenwich,
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which roughly corresponds with the east coast of China.
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For people west of China, this might result that the start of Chinese
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New Year and the day of the related new moon might differ.
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.Pp
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The phases of the moon and the longitude of the sun are calculated
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against the local position which corresponds with 30 degrees times
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the time-difference towards Greenwich.
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.Pp
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The new and full moons are happening on the day indicated: They
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might happen in the time period in the early night or in the late
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evening.
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It does not indicate that they are starting in the night on that date.
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.Pp
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Because of minor differences between the output of the formulas
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used and other sources on the Internet, Druids and Werewolves should
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double-check the start and end time of solar and lunar events.
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.Sh BUGS
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The
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.Nm
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does only recognise the cpp directives #include, #define, #ifdef,
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#ifndef and #else.
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It supports nested conditions, but does not perform any validation
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on the correct use and nesting of conditions.
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#endif without prior #ifdef or #define is ignored and #else outside
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a conditional section skips input lines up to the next #endif.
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.Pp
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There is no possibility to properly specify the local position
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needed for solar and lunar calculations.
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