Module:Countdown-ymd

-- This module powers. require('strict')

local p = {} local static_text = { ['eventtime'] = 'Time to event:', ['begins'] = 'Event begins in',												-- when |duration= is set ['ends'] = 'Event ends in',													-- when |duration= is set ['ended'] = 'Event has ended.',												-- when |duration= is set ['passed'] = 'Event time has passed.', ['invalid'] = ' Error: invalid date and/or time ', }

local getArgs = require('Module:Arguments').getArgs

--[[--< F O R M A T _ U N I T >

Concatenates a singular or plural label to a time/date unit: unit label or unit labels. If unit is 0 or less, returns nil

]]

local function format_unit (unit, label) if 1 > unit then															-- less than one so don't display return nil;																-- return nil so the result of this call isn't stuffed into results table by table.insert elseif 1 == unit then return unit .. ' ' .. label;											-- only one unit so return singular label else return unit .. ' ' .. label .. 's';										-- multiple units so return plural label end end

--[[--< D U R A T I O N >--

Returns duration of event in seconds. If the units are not defined, assumes seconds. If the units are defined but not one of day, days, hour, hours, minute, minutes, second, seconds then returns zero.


 * duration=

TODO: Why are we even considering seconds and minutes? Would it be better to specify and end time?

]]

local function duration (duration) local number, unit = duration:match ('(%d+)%s+(%a*)'); if not number then return 0;																-- duration not properly specified elseif not unit then return number;															-- unit not defined, assume seconds end if unit:match ('days?') then return number * 86400; elseif unit:match ('hours?') then return number * 3600; elseif unit:match ('minutes?') then return number * 60; elseif unit:match ('seconds?') then return number; else return 0;																-- unknown unit end end

--[[--< U T C _ O F F S E T >--

Returns offset from UTC in seconds. If 'utc offset' parameter is out of range or malformed, returns 0.

TODO: Return a success/fail flag so we can emit an error message?

]]

local function utc_offset (offset) local sign, utc_offset_hr, utc_offset_min; if offset:match('^[%+%-]%d%d:%d%d$') then									-- formal style: sign, hours colon minutes all required sign, utc_offset_hr, utc_offset_min = offset:match('^([%+%-])(%d%d):(%d%d)$'); elseif offset:match('^[%+%-]?%d?%d:?%d%d$') then							-- informal: sign and colon optional, 1- or 2-digit hours, and minutes sign, utc_offset_hr, utc_offset_min = offset:match('^([%+%-]?)(%d?%d):?(%d%d)$'); elseif offset:match('^[%+%-]?%d?%d$') then									-- informal: sign optional, 1- or 2-digit hours only sign, utc_offset_hr = offset:match('^([%+%-]?)(%d?%d)$'); utc_offset_min = 0;														-- because not included in parameter, set it to 0 minutes else return 0;																-- malformed so return 0 seconds end utc_offset_hr = tonumber (utc_offset_hr); utc_offset_min = tonumber (utc_offset_min); if 12 < utc_offset_hr or 59 < utc_offset_min then							-- hour and minute range checks return 0; end if '-' == sign then sign = -1;																-- negative west offset else sign = 1;																-- + or sign omitted east offset end utc_offset_hr = sign * (utc_offset_hr * 3600);								-- utc offset hours * seconds/hour utc_offset_min = sign * (utc_offset_min * 60);								-- utc offset minutes * seconds/minute return utc_offset_hr + utc_offset_min;										-- return the UTC offset adjustment in seconds end

--[[--< G E T _ D A Y S _ I N _ M O N T H >

Returns the number of days in the month where month is a number 1–12 and year is four-digit Gregorian calendar. Accounts for leap year.

]]

local function get_days_in_month (year, month) local days_in_month = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; year = tonumber (year);														-- force these to be numbers just in case month = tonumber (month);

if (2 == month) then														-- if February if (0 == (year%4) and (0 ~= (year%100) or 0 == (year%400))) then		-- is year a leap year? return 29;															-- if leap year then 29 days in February end end return days_in_month [month]; end

--[[--< D I F F _ T I M E >

calculates the difference between two times; returns a table of the differences in diff.hour, diff.min, and diff.sec

]]

local function diff_time (a, b)	local diff = {} diff.sec = a.sec - b. sec; if diff.sec < 0 then diff.sec = diff.sec + 60;												-- borrow from minutes a.min = a.min - 1; if a.min < 0 then a.min = a.min + 60;													-- borrow from hours a.hour = a.hour - 1; end end diff.min = a.min - b.min; if diff.min < 0 then diff.min = diff.min + 60;												-- borrow from hours a.hour = a.hour - 1; end diff.hour = a.hour - b.hour; return diff; end

--[[--< D I F F _ D A T E >

calculates the difference between two dates; returns a table of the difference in diff.year, diff.month, and diff.day

]]

local function diff_date (a, b)	local diff = {} diff.day = a.day - b.day; if diff.day < 0 then a.month = a.month - 1; if a.month < 1 then a.year = a.year - 1;												-- borrow a month from years a.month = a.month + 12; end diff.day = diff.day + get_days_in_month (a.year, a.month);				-- borrow all of the days from the *previous* month end

diff.month = a.month - b.month; if diff.month < 0 then a.year = a.year - 1;													-- borrow a month from years diff.month = diff.month + 12; end diff.year = a.year - b.year; return diff; end

--[[--< I S _ V A L I D _ D A T E _ T I M E >--

Validate date/time. Also, determine if we have all of the necessary date/time componants. Minimal required date/time is |year=.

For dates, these are required (all other variations emit an error message): |year= or	|year= |month= or	|year= |month= |day= If time is included, these are required (all other variations emit an error message): |hour= or	|hour= |minute= or	|hour= |minute= |second=

]]

local function is_valid_date_time (year, month, day, hour, minute, second) if not year or (not month and day) then										-- must have YMD, YM, or Y		return false; end

year = tonumber (year); if not year or 1582 > year or 9999 < year then return false; end			-- must be four digits in gregorian calander if month then month = tonumber (month); if not month or 1 > month or 12 < month then return false; end			-- 1 to 12 end if day then day = tonumber (day); if not day or 1 > day or get_days_in_month (year, month) < day then		-- 1 to 28, 29, 30, or 31 depending on month return false; end end

if ((minute or second) and not hour) or (not minute and second) then		-- must have H:M:S or H:M or H or none at all return false; end if hour then hour = tonumber (hour); if not hour or 0 > hour or 23 < hour then return false; end				-- 0 to 23 end if minute then minute = tonumber (minute); if not minute or 0 > minute or 59 < minute then return false; end		-- 0 to 59 end if second then second = tonumber (second); if not second or 0 > second or 59 < second then return false; end		-- 0 to 59 end return true;

end

--[[--< M A I N >--

Supported parameters: date and time parameters: |year= (required), |month=, |day= |hour=, |minute=, |second= |utc offset= |duration=

presentation parameters: |color= wrapping-text parameters: |event lead= – text ahead of countdown text while event is in progress; countdown text is time to end of event; default is static_text.ends |event tail= – text that follows countdown text while event is in progress; default is empty string |expired= - display text when event is in the past; default is static_text.passed; when |duration= is set then default is static_text.ended |lead= – text ahead of countdown text; default is static_text.begins; overridden by |event lead= while event is in progress; |tail= – text that follows countdown text; default is empty string; overridden by |event tail= while event is in progress

]]

function p.main(frame) local args = getArgs(frame)

if false == is_valid_date_time (args.year, args.month, args.day, args.hour, args.minute, args.second) then	-- validate our inputs; minimal requirement is |year= return static_text.invalid; end -- convert event time parameters to seconds; use default January 1 @ 0h for defaults if not provided local event = os.time({year=args.year, month=args.month or 1, day=args.day or 1, hour=args.hour or 0, min=args.minute, sec=args.second});	-- convert to seconds if args['utc offset'] then event = event - utc_offset(args['utc offset']);							-- adjust event time to UTC from local time end if 'none' == args.expired then args.expired = ''; end if event < os.time then													-- if event time is in the past if not args.duration then return args.expired or static_text.passed;							-- if the event start time has passed, we're done else event = event + duration (args.duration);							-- calculate event ending time if event < os.time then return args.expired or static_text.ended;						-- if the event start time + duration has passed, we're done end end else																		-- here when event has not yet started or occured if not args.lead then if args.duration then args.lead = static_text.begins;									-- default lead text when |duration= set but |lead= not set else args.lead = static_text.eventtime;								-- default lead text when |duration= and |lead= not set end end args.duration = nil;													-- event not yet started; unset so that we render text around the countdown correctly end local today = os.date ('*t');												--fetch table of current date time parameters from the server local event_time = os.date ('*t', event);									--fetch table of event date time parameters from the server local hms_til_start = diff_time (event_time, today)							-- table of time difference (future time - current time) if hms_til_start.hour < 0 then												-- will be negative if we need to borrow hours from day hms_til_start.hour = hms_til_start.hour + 24;							-- borrow a day's worth of hours from event start date event_time.day = event_time.day - 1; end

local ymd_til_start = diff_date (event_time, today)							-- table of date difference (future date - current date)

local result = {}															-- results table with some formatting; values less than one are not added to the table table.insert (result, format_unit (ymd_til_start.year, 'year'));			-- add date parameters table.insert (result, format_unit (ymd_til_start.month, 'month')); table.insert (result, format_unit (ymd_til_start.day, 'day')); local count = #result;														-- zero if less than 24 hours to event; when less than 24 hours display all non-zero time units table.insert (result, format_unit (hms_til_start.hour, 'hour'));			-- always include hours if it is not zero if args.hour or 0 == count then												-- if event start hour provided in template, show non-zero minutes table.insert (result, format_unit (hms_til_start.min, 'minute')); end if (args.minute and args.hour) or 0 == count then							-- if event start hour and minute provided in template, show non-zero seconds table.insert (result, format_unit (hms_til_start.sec, 'second')); end result = table.concat (result, ', '); result = mw.ustring.gsub(result, '(%d+)', '%1 ') local refreshLink = mw.title.getCurrentTitle:fullUrl{action = 'purge'} refreshLink = mw.ustring.format(' [ [%s refresh] ]', refreshLink)

if not args.duration then													-- will be nil if event hasn't started yet or |duration= not specified args.lead = args.lead or static_text.eventtime;							-- use default begins text else args.lead = args['event lead'] or static_text.ends;						-- event has started use |event lead= text or default ends text args.tail = args['event tail'];											-- and use |event tail= text end

if 'none' == args.lead then													-- here, if either arg.lead and args['event lead'] were set to keyword'none' args.lead = '';															-- set lead text to empty string elseif args.lead then args.lead = args.lead .. ' ';											-- add a space end

if args.tail then args.tail = ' ' .. args.tail;											-- add a space else args.tail = '';															-- empty string for concatenation end return args.lead .. result .. args.tail .. refreshLink; end

return p