Modul:Year in other calendars

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-- Load dependencies.
local getArgs = require('Module:Arguments').getArgs
local htmlBuilder = require( 'Module:HtmlBuilder' )
local makeNavbar = require( 'Module:Navbar' )._navbar
local numToRoman = require( 'Module:Roman' ).main
local japaneseEra = require( 'Module:Japanese calendar' ).era()

-- Define constants.
local lang = mw.language.getContentLanguage()
local currentYear = tonumber( lang:formatDate( 'Y' ) )

--------------------------------------------------------------------
-- Helper functions
--------------------------------------------------------------------

local function isInteger( num )
	-- Checks if a value is an integer. If so, returns the value converted to a number.
	-- If not, returns false.
    num = tonumber( num )
    if num and math.floor( num ) == num and num ~= math.huge then
        return num
    else
        return false
    end
end

local function BCToNum( s )
	-- Mengubah string dalam format "n SM" ke 
	-- nilai angka.
    if type( s ) ~= 'string' then
        return nil
    end
    s = mw.ustring.match( mw.ustring.upper( s ), '^([1-9]%d*)%s*SM$' )
    if not s then
        return nil
    end
    local num = tonumber( s )
    num = ( num - 1 ) * -1
    return num
end

local function numToBC( num )
	-- For BC years, returns a string with the year name appended with " BC".
	-- Otherwise returns nil.
    num = isInteger( num )
    if not num then return end
    if num <= 0 then
        return mw.ustring.format( '%d SM', 1 - num )
    end
end

local function formatNegative(s)
	-- Replaces hyphens in a string with minus signs if the hyphen comes before a number.
	s = mw.ustring.gsub( s, '%-(%d)', '−%1' )
	return s
end

--------------------------------------------------------------------
-- Calendar box class definition
--------------------------------------------------------------------

local calendarBox = {}
calendarBox.__index = calendarBox

function calendarBox:new( init )
    init = type( init ) == 'table' and init or {}
    local obj = {}
    local pagename = mw.title.getCurrentTitle().text
    
    -- Set the year. If the year is specified as an argument, use that.
    -- Otherwise, use the page name if it is valid. If the pagename isn't
    -- valid, use the current year.
    local yearNum = isInteger( init.year )
    if yearNum then -- First, see if the year parameter is a number.
        self.year = yearNum
    else
        local yearBC = BCToNum( init.year )
        if yearBC then -- Second, see if the year parameter is a "yyyy BC" string.
            self.year = yearBC
        else
            local pageNum = isInteger( pagename )
            if pageNum then -- Third, see if the pagename is an integer.
                self.year = pageNum
            else
                local pageBC = BCToNum( pagename )
                if pageBC then -- Fourth, see if the pagename is a "yyyy BC" string.
                    self.year = pageBC
                else
                    self.year = currentYear -- If none of the above apply, use the current year.
                end
            end
        end
    end
    
    -- Set year text values.
    self.BCYearName = numToBC( self.year )
    if self.BCYearName then
        self.yearText = self.BCYearName
    else
        self.yearText = tostring( self.year )
    end
        
    -- Set other fields.
    self.caption = self.yearText
    self.footnotes = init.footnotes
    self.navbar = init.navbar
    
    return setmetatable( obj, {
        __index = self
    })
end

function calendarBox:setCaption( s )
	-- Sets the calendar box caption.
    if type( s ) ~= 'string' or s == '' then return end
    self.caption = s
end

function calendarBox:addCalendar( obj )
	-- Adds a calendar or a calendar group.
    if type( obj ) ~= 'table' and type( obj.new ) ~= 'function' then return end -- Exit if the object is invalid.
    self.calendars = self.calendars or {}
    table.insert( self.calendars, obj )
end

-- Add an alias for adding calendar groups. The function is the same, but it might be confusing for users
-- to have to use the name "addCalendar" for a calendar group.
calendarBox.addCalendarGroup = calendarBox.addCalendar

function calendarBox:export()
	-- Outputs the calendar box wikitext.
    local root = htmlBuilder.create( 'table' )
    -- Export the calendar box headers.
    root
        .addClass( 'infobox' )
        .addClass( 'vevent' )
        .css( 'width', '22em' )
        .tag( 'caption' )
            .css( 'font-size', '125%' )
            .tag( 'span' )
                .addClass( 'summary' )
                .addClass( 'dtstart' )
                .wikitext( self.caption )

    -- Export the calendars and calendar groups. "calendar:export()" works for both kinds
    -- of objects. Some export functions can return nil, so we need to check for that.
    if type( self.calendars ) == 'table' then
        for i, calendar in ipairs( self.calendars ) do
            local calendarText = calendar:export()
            if type( calendarText ) == 'string' then
                root.wikitext( calendarText )
            end
        end
    end
    
    -- Add footnotes.
    if type( self.footnotes ) == 'string' and self.footnotes ~= '' then
        root
            .tag( 'tr' )
                .tag( 'td' )
                    .attr( 'colspan', '2' )
                    .wikitext( mw.ustring.format( '<small>%s</small>', self.footnotes ) )
    end
    
    -- Add navbar.
    if type( self.navbar ) == 'string' and self.navbar ~= '' then
        root
            .tag( 'tr' )
                .tag( 'td' )
                    .attr( 'colspan', '2' )
                    .css( 'text-align', 'center' )
                    .wikitext( makeNavbar{ self.navbar } )
    end
    
    return tostring( root )
end

--------------------------------------------------------------------
-- Calendar group class definition
--------------------------------------------------------------------

--  Calendar groups are used to group different calendars together. 
--  Previously, the template did this by including a table row with
--  no year value. By using objects we can do the same thing more
--  semantically.

local calendarGroup = {}
calendarGroup.__index = calendarGroup

function calendarGroup:new( init )
    init = type( init ) == 'table' and init or {}
    local obj = {}
    
    -- Get the heading and throw an error if it is invalid.
    obj.heading = init.heading
    if type( obj.heading ) ~= 'string' then
        error( 'calendarGroup: no heading detected' )
    end
    
    -- Set the metatable and return the object.
    self.__index = self
    return setmetatable( obj, {
        __index = self
    })
end

function calendarGroup:addCalendar( calendar )
	-- Adds a calendar object to the calendar group.
    self.calendars = self.calendars or {}
    if type( calendar ) == 'table' and type( calendar.getLink ) == 'function' then
        table.insert( self.calendars, calendar )
    end
end

function calendarGroup:export()
	-- Exports the calendar group's wikitext.
    -- Indent and italicise each calendar's link if it exists.
    for i, calendar in ipairs( self.calendars ) do
        local link = calendar:getLink()
        if type( link ) == 'string' then
            self.calendars[ i ]:setRawLink( mw.ustring.format( "&nbsp;- ''%s''", link ) )
        end
    end
    -- Create the heading row html and export the calendar objects.
    local ret = htmlBuilder.create()
    ret
        .tag( 'tr' )
            .tag( 'td' )
                .wikitext( self.heading )
                .done()
            .tag( 'td' ) -- Use a blank tag to make the html look nice.
                .allDone()
    for i, calendar in ipairs( self.calendars ) do
        ret.wikitext( calendar:export() )
    end
    return tostring( ret )
end

--------------------------------------------------------------------
-- Calendar class definition
--------------------------------------------------------------------

local calendar = {}
calendar.__index = calendar
calendar.type = 'calendar'

function calendar:new()
    local obj = {}
    return setmetatable( obj, {
        __index = self
    })
end

function calendar:setLink( link, display )
	-- Sets the calendar's wikilink, with optional display text and italics.
    if type( link ) ~= 'string' or link == '' then return end
    display = type( display ) == 'string' and display ~= '' and display
    if display then
        self.link = mw.ustring.format( '[[%s|%s]]', link, display )
    else
        self.link = mw.ustring.format( '[[%s]]', link )
    end
end

function calendar:setRawLink( s )
	-- Sets the calendar's wikilink as raw wikitext.
    if type( s ) ~= 'string' or s == '' then return end
    self.link = s
end

function calendar:getLink()
	-- Returns the calendar's link value.
    return self.link
end

function calendar:setYear( year )
	-- Sets a single year. Can be passed either a string or a number.
	-- If passed as a number, it is formatted with minus signs instead of hyphens.
	-- If passed as a string, no minus-sign formatting occurs; this should be done in the individual calendar definitions.
    if type( year ) == 'number' then
        year = tostring( year )
		self.year = formatNegative( year )
    elseif type( year ) == 'string' then
        self.year = year
    end
end

function calendar:setYearRange( year1, year2 )
	-- Sets a year range. Must be passed two numbers.
    if type( year1 ) == 'number' and type( year2 ) == 'number' then
		local year
        if year1 < 0 or year2 < 0 then -- Leave a gap for negative years to avoid having a minus sign and a dash right next to each other.
            year = mw.ustring.format( '%d – %d', year1, year2 )
			year = formatNegative( year )
        else
            year = mw.ustring.format( '%d–%d', year1, year2 )
        end
		self.year = year
    end
end

function calendar:setYearCouple( year1, year2 )
	-- Same as setYearRange, only with a slash (/) in the middle. Must be passed two numbers. 
	-- Additional text possible, must be defined as follows: addtext = string.format( 'additional text or link')
	-- See example in Seleucid era calendar
	if type( year1 ) == 'number' and type( year2 ) == 'number' then
		local year
		if year1 < 0 or year2 < 0 then -- Leave no gap for negative years.
			year = string.format( '%d/%d %s', year1, year2, addtext )
			year = formatNegative( year )
		else
			year = string.format( '%d/%d %s', year1, year2, addtext )
		end
		self.year = year
	end
end

function calendar:export()
	-- Outputs the calendar wikitext.
    -- Exit if no link has been specified.
    local link = self.link
    if type( link ) ~= 'string' or link == '' then return end

    -- If no year has been specified, set the year value to N/A.
    local year = self.year
    if type( year ) ~= 'string' or year == '' then
        year = "''N/A''"
    end

    -- Build the table row.
    local ret = htmlBuilder.create()
    ret
        .tag( 'tr' )
            .tag( 'td' )
                .wikitext( link )
                .done()
            .tag( 'td' )
                .wikitext( year )
                .allDone()
    return tostring( ret )
end

--------------------------------------------------------------------
-- Build the box
--------------------------------------------------------------------

local function makeCalendarBox( args )
    -- Initiate the box and get the year values.
    local init = args
    init.navbar = 'Tahun dalam kalender lain'
    local box = calendarBox:new( init )
    local year = box.year
    local yearText = box.yearText

    -- Set the caption.
    box:setCaption( box.caption .. ' dalam kalender lain' )

    ----------------------------------------------------------------------
    -- Gregorian calendar
    ----------------------------------------------------------------------

    local gregorian = calendar:new()
    gregorian:setLink( 'Kalender Gregorian' )
    -- Get the year link.
    local gregcal = args.gregcal
    if type( gregcal ) == 'string' and gregcal ~= '' then
        gregorian.yearLink = string.format( '[[%s|%s]]', gregcal, yearText )
    else
        gregorian.yearLink = yearText
    end
    -- Set the year.
    gregorian.romanYear = numToRoman{ math.abs(year) } .. (year < 0 and ' BC' or '')
    if gregorian.romanYear then
        gregorian:setYear( string.format(
				[[%s<br /><span style="font-family: serif;">''%s''</span>]],
            gregorian.yearLink, gregorian.romanYear
        ) )
    else
        gregorian:setYear( gregorian.yearLink )
    end
    box:addCalendar( gregorian ) 

    ----------------------------------------------------------------------
    -- Bahá'í calendar
    ----------------------------------------------------------------------
    
    local bahai = calendar:new()
    bahai:setLink( "Kalender Bahá'í" )
    bahai:setYearRange( year - 1844, year - 1843 )
    box:addCalendar( bahai )
    
    ----------------------------------------------------------------------
    -- Balinese saka calendar
    ---------------------------------------------------------------------- 
    local balinese = calendar:new()
    balinese:setLink( 'Kalender Bali' )
    if year - 76 > 0 then
    	balinese:setYearRange( year - 79, year - 78 )
    end
    box:addCalendar( balinese )
    
    ----------------------------------------------------------------------
    -- Bengali calendar
    ----------------------------------------------------------------------

    local bengali = calendar:new()
    bengali:setLink( 'Kalender Bengali' )
    bengali:setYear( year - 593 )
    box:addCalendar( bengali )

    ----------------------------------------------------------------------
    -- Berber calendar
    ----------------------------------------------------------------------
    
    local berber = calendar:new()
    berber:setLink( 'Kalender Berber' )
    berber:setYear( year + 950 )
    box:addCalendar( berber )

    ----------------------------------------------------------------------
    -- Buddhist calendar
    ----------------------------------------------------------------------

    local buddhist = calendar:new()
    buddhist:setLink( 'Kalender Buddha' )
    buddhist:setYear( year + 544 )
    box:addCalendar( buddhist )

    ----------------------------------------------------------------------
    -- Burmese calendar
    ----------------------------------------------------------------------

    local burmese = calendar:new()
    burmese:setLink( 'Kalender Burma' )
    burmese:setYear( year - 638 )
    box:addCalendar( burmese )

    ----------------------------------------------------------------------
    -- Chinese calendar
    ----------------------------------------------------------------------
    
    local chinese = calendar:new()
    chinese:setLink( 'Kalender Tionghoa' )

    -- Define the information for the "heavenly stems" and "earthly branches" year cycles.
    -- See [[Chinese calendar#Cycle of years]] for information.

    local heavenlyStems = {
        { '甲', '[[Kayu]]' },   -- 1
        { '乙', '[[Kayu]]' },   -- 2
        { '丙', '[[Api]]' },   -- 3
        { '丁', '[[Api]]' },   -- 4
        { '戊', '[[Tanah]]' },  -- 5
        { '己', '[[Tanah]]' },  -- 6
        { '庚', '[[Logam]]' },  -- 7
        { '辛', '[[Logam]]' },  -- 8
        { '壬', '[[Air]]' },  -- 9
        { '癸', '[[Air]]' }   -- 10
    }

    local earthlyBranches = {
        { '子', '[[Tikus (shio)|Tikus]]' },           -- 1
        { '丑', '[[Kerbau (shio)|Kerbau]]' },             -- 2
        { '寅', '[[Macan (shio)|Macan]]' },       -- 3
        { '卯', '[[Kelinci (shio)|Kelinci]]' },     -- 4
        { '辰', '[[Naga (shio)|Naga]]' },     -- 5
        { '巳', '[[Ular (shio)|Ular]]' },       -- 6
        { '午', '[[Kuda (shio)|Kuda]]' },       -- 7
        { '未', '[[Kambing (shio)|Kambing]]' },         -- 8
        { '申', '[[Kera (shio)|Kera]]' },     -- 9
        { '酉', '[[Ayam (shio)|Ayam]]' },   -- 10
        { '戌', '[[Anjing (shio)|Anjing]]' },           -- 11
        { '亥', '[[Babi (shio)|Babi]]' }            -- 12
    }

    -- Menghitung angka siklus suatu tahun. The first sexagenary year corresponds to the ''previous'' year's entry
    -- in [[Chinese calendar correspondence table]], as the Chinese New Year doesn't happen until Jan/Feb in
    -- Gregorian years.
    local sexagenaryYear1 = ( year - 4 ) % 60
    local sexagenaryYear2 = ( year - 3 ) % 60
    local heavenlyNum1 = sexagenaryYear1 % 10
    local heavenlyNum2 = sexagenaryYear2 % 10
    local earthlyNum1 = sexagenaryYear1 % 12
    local earthlyNum2 = sexagenaryYear2 % 12

    -- If the value is 0 increase it by one cycle so that we can use it with Lua arrays.
    if heavenlyNum1 == 0 then
        heavenlyNum1 = 10
    end
    if heavenlyNum2 == 0 then
        heavenlyNum2 = 10
    end
    if earthlyNum1 == 0 then
        earthlyNum1 = 12
    end
    if earthlyNum2 == 0 then
        earthlyNum2 = 12
    end

    -- Get the data tables for each permutation.
    local heavenlyTable1 = heavenlyStems[ heavenlyNum1 ]
    local heavenlyTable2 = heavenlyStems[ heavenlyNum2 ]
    local earthlyTable1 = earthlyBranches[ earthlyNum1 ]
    local earthlyTable2 = earthlyBranches[ earthlyNum2 ]

    -- Work out the continously-numbered year. (Lihat [[Chinese calendar#Continuously numbered years]].)
    local year1 = year + 2696
    local year2 = year + 2697
    local year1Alt = year1 - 2146
    local year2Alt = year2 - 2146

	-- Format any negative numbers.
	year1 = formatNegative( tostring( year1 ) )
	year2 = formatNegative( tostring( year2 ) )
	year1Alt = formatNegative( tostring( year1Alt ) )
	year2Alt = formatNegative( tostring( year2Alt ) )

    -- Return all of that data in a (hopefully) reader-friendly format.
    chinese:setYear( mw.ustring.format(
        [=[[[Ganzhi|%s%s]]年 <small>(%s&nbsp;%s)</small><br />%s atau %s<br />&nbsp;&nbsp;&nbsp;&nbsp;''—&nbsp;sampai&nbsp;—''<br />%s%s年 <small>(%s&nbsp;%s)</small><br />%s atau %s]=],
        heavenlyTable1[ 1 ],
        earthlyTable1[ 1 ],
        earthlyTable1[ 2 ],
        heavenlyTable1[ 2 ],
        year1,
        year1Alt,
        heavenlyTable2[ 1 ],
        earthlyTable2[ 1 ],
        earthlyTable2[ 2 ],
        heavenlyTable2[ 2 ],
        year2,
        year2Alt
    ) )

    box:addCalendar( chinese )
    
    ----------------------------------------------------------------------
    -- Coptic calendar
    ----------------------------------------------------------------------

    local coptic = calendar:new()
    coptic:setLink( 'Kalender Koptik' )
    coptic:setYearRange( year - 284, year - 283 )
    box:addCalendar( coptic )
 
    ----------------------------------------------------------------------
    -- Ethiopian calendar
    ----------------------------------------------------------------------

    local ethiopian = calendar:new()
    ethiopian:setLink( 'Kalender Etiopia' )
    ethiopian:setYearRange( year - 8, year - 7 )
    box:addCalendar( ethiopian )

    ----------------------------------------------------------------------
    -- Hebrew calendar
    ----------------------------------------------------------------------

    local hebrew = calendar:new()
    hebrew:setLink( 'Kalender Ibrani' )
    hebrew:setYearRange( year + 3760, year + 3761 )
    box:addCalendar( hebrew )

    ----------------------------------------------------------------------
    -- Hindu calendars
    ----------------------------------------------------------------------

    local hindu = calendarGroup:new{ heading = '[[Kalender Hindu]]' }

    -- Vikram Samvat

    local vikramSamvat = calendar:new()
    vikramSamvat:setLink( 'Vikram Samvat' )
    vikramSamvat:setYearRange( year + 56, year + 57 )
    hindu:addCalendar( vikramSamvat )

    -- Shaka Samvat

    local shakaSamvat = calendar:new()
    shakaSamvat:setLink( 'Kalender Saka', 'Shaka Samvat' )
    if year - 76 > 0 then
        shakaSamvat:setYearRange( year - 78, year - 77 )
    end
    hindu:addCalendar( shakaSamvat )

    -- Kali Yuga
    
    local kaliYuga = calendar:new()
    kaliYuga:setLink( 'Kali Yuga' ) -- use italics
    kaliYuga:setYearRange( year + 3101, year + 3102 )
    hindu:addCalendar( kaliYuga )

    box:addCalendarGroup( hindu )

    ----------------------------------------------------------------------
    -- Holocene calendar
    ----------------------------------------------------------------------

    local holocene = calendar:new()
    holocene:setLink( 'Kalender Holosen' )
    holocene:setYear( year + 10000 )
    box:addCalendar( holocene )

    ----------------------------------------------------------------------
    -- Iranian calendar
    ----------------------------------------------------------------------

    local iranian = calendar:new()
    iranian:setLink( 'Kalender Iran')
    if year - 621 > 0 then
        iranian:setYearRange( year - 622, year - 621 )
    else
        iranian:setYear( mw.ustring.format( '%d BP&nbsp;– %d BP', 622 - year, 621 - year ) )
    end
    box:addCalendar( iranian )

    ----------------------------------------------------------------------
    -- Islamic calendar
    ----------------------------------------------------------------------

    local islamic = calendar:new()
    islamic:setLink( 'Kalender Islam' )
    local islamicMult = 1.030684 -- the factor to multiply by
    local islamicSub = 621.5643 -- the factor to subtract by
    if year - 621 > 0 then
        local year1 = math.floor( islamicMult * ( year - islamicSub ) )
        local year2 = math.floor( islamicMult * ( year - islamicSub + 1 ) )
        islamic:setYearRange( year1, year2 )
    else
        local year1 = math.ceil( -islamicMult * ( year - islamicSub ) )
        local year2 = math.ceil( -islamicMult * ( year - islamicSub + 1 ) )
        islamic:setYear( mw.ustring.format( '%d SH&nbsp;– %d SH', year1, year2 ) )
    end
    box:addCalendar( islamic )

    ----------------------------------------------------------------------
    -- Japanese calendar
    ----------------------------------------------------------------------

    local japanese = calendar:new()
    japanese:setLink( 'Kalender Jepang' )

    japanese.thisEra = japaneseEra:new{ year = year }
    if japanese.thisEra then
        local japaneseYearText = {}
        japanese.oldEra = japanese.thisEra:getOldEra()
        if japanese.oldEra and japanese.oldEra.eraYear and japanese.thisEra.article ~= japanese.oldEra.article then
            japanese.oldText = mw.ustring.format( '%s %d', japanese.oldEra.link, japanese.oldEra.eraYear )
            table.insert( japaneseYearText, japanese.oldText )
            table.insert( japaneseYearText, ' / ' )
        end
        if japanese.thisEra.eraYear then
            table.insert( japaneseYearText, mw.ustring.format( '%s %d', japanese.thisEra.link, japanese.thisEra.eraYear ) )
        end
        table.insert( japaneseYearText, mw.ustring.format( '<br /><small>(%s%s年)</small>', japanese.thisEra.kanji, japanese.thisEra.eraYearKanji ) )
        japanese:setYear( table.concat( japaneseYearText ) )
    end
 
     -- Japanese imperial year
    
    local imperial = calendar:new()
    imperial:setLink( 'Tahun Jepang' )
    imperial:setYear( year + 660 )
 
    box:addCalendar( japanese )
    
	----------------------------------------------------------------------
	-- Javanese calendar
	----------------------------------------------------------------------

	local javanese = calendar:new()
	javanese:setLink( 'Kalender Jawa' )
	local javaneseMult = 1.030684 -- the factor to multiply by
	local javaneseSub = 124.9 -- the factor to subtract by
	if year - 124 > 0 then
		local year1 = math.floor( javaneseMult * ( year - javaneseSub ) )
		local year2 = math.floor( javaneseMult * ( year - javaneseSub + 1 ) )
		javanese:setYearRange( year1, year2 )
	else
		local year1 = math.ceil( -javaneseMult * ( year - javaneseSub ) )
		local year2 = math.ceil( -javaneseMult * ( year - javaneseSub + 1 ) )
	end
	box:addCalendar( javanese )

    ----------------------------------------------------------------------
    -- Julian calendar
    ----------------------------------------------------------------------

    local julian = calendar:new()
    julian:setLink( 'Kalender Julian' )

    julian.yearVals = {
        { 1901, 'Gregorian dikurangi 13 hari' },
        { 1900, 'Gregorian dikurangi 12 atau 13 hari'},
        { 1801, 'Gregorian dikurangi 12 hari' },
        { 1800, 'Gregorian dikurangi 11 atau 12 hari' },
        { 1701, 'Gregorian dikurangi 11 hari' },
        { 1700, 'Gregorian dikurangi 10 atau 11 hari' },
        { 1582, 'Gregorian dikurangi 10 hari' },
        { -45, gregorian.year }
    }

    for i, t in ipairs( julian.yearVals ) do
        if year >= t[ 1 ] then
            julian:setYear( t[ 2 ] )
            break
        end
    end

    box:addCalendar( julian )
    
    ----------------------------------------------------------------------
    -- Korean calendar
    ----------------------------------------------------------------------

    local korean = calendar:new()
    korean:setLink( 'Kalender Korea' )
    korean:setYear( year + 2333 )
    box:addCalendar( korean )

	----------------------------------------------------------------------
	-- Nanakshahi calendar
	----------------------------------------------------------------------

	local nanakshahi = calendar:new()
	nanakshahi:setLink( 'Kalender Nanakshahi' )
	nanakshahi:setYear( year - 1468 )
	box:addCalendar( nanakshahi )
    
    ----------------------------------------------------------------------
    -- Thai solar calendar
    ----------------------------------------------------------------------

    local thai = calendar:new()
    thai:setLink( 'Suriyakhati' )
    thai:setYear( year + 543 )
    box:addCalendar( thai )
    
    ----------------------------------------------------------------------
    -- Unix time
    ----------------------------------------------------------------------
    
    local unix = calendar:new()

    local function getUnixTime( year )
        if year < 1970 then return end
        local noError, unixTime = pcall( lang.formatDate, lang, 'U', '1 Jan ' .. tostring( year ) )
        if not noError or noError and not unixTime then return end
        unixTime = tonumber( unixTime )
        if unixTime and unixTime >= 0 then
            return unixTime
        end
    end

    unix.thisYear = getUnixTime( year )
    unix.nextYear = getUnixTime( year + 1 )
    if unix.thisYear and unix.nextYear then
        unix:setLink( 'Unix time' )
        unix:setYearRange( unix.thisYear, unix.nextYear - 1 )
    end

    box:addCalendar( unix )

    return box:export()
end

--------------------------------------------------------------------
-- Process arguments from #invoke
--------------------------------------------------------------------

local p = {}

function p.main( frame )
	-- Process the arguments and pass them to the box-building function.
	local args = getArgs( frame )
	-- Pass year argument with 'year' parameter or without any name but first argument
	args.year = args.year or args[1]
    return makeCalendarBox( args )
end

return p