From: Lady <redacted>
Date: Sat, 6 Jan 2024 19:37:41 +0000 (-0500)
Subject: Initial attempt at a calendar widget
X-Git-Url: https://git.ladys.computer/WWW/commitdiff_plain/36b2d2e30e446c280835164257660ae0f7cef876

Initial attempt at a calendar widget

This is still a demo; more functionality will be added over time but
this at least displays the days correctly.
---

diff --git a/sources/calendar/index.xhtml b/sources/calendar/index.xhtml
new file mode 100644
index 0000000..cf55a00
--- /dev/null
+++ b/sources/calendar/index.xhtml
@@ -0,0 +1,170 @@
+<?xml version="1.0"?>
+<article xmlns="http://www.w3.org/1999/xhtml" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:书社="urn:fdc:ladys.computer:20231231:Shu1She4" lang="en" xml:lang="en">
+	<style><![CDATA[@charset "UTF-8";
+#widget h2{ Margin-Inline: Auto; Margin-Block-End: 1REM; Border-Block-End: Thin Solid; Padding-Inline: 1CH; Max-Inline-Size: Max-Content }
+#widget>footer{ Display: Grid; Margin-Block: 1REM; Margin-Inline: Auto; Max-Inline-Size: Max-Content; Grid-Template-Columns: 1FR 1FR 1FR; Gap: 1CH }
+#widget>div{ Display: Flex; Margin-Block: 1REM; Flex-Flow: Row Wrap; Gap: 1REM }
+#widget>div>div:First-Child{ Min-Inline-Size: Max-Content; Inline-Size: 27REM; Flex: Auto;}
+#widget>div>div:First-Child>table{ Margin-Inline: Auto; Font-Variant-Numeric: Lining-Nums Tabular-Nums; Text-Align-Last: Auto }
+#widget>div>div:First-Child>table th{ Border-Block-End: Thin Solid; Text-Align: Center }
+#widget>div>div:First-Child>table td{ Position: Relative; Border: Thin Solid; Padding: 0; Block-Size: 3.5EM; Inline-Size: 3.5EM; Vertical-Align: Top; Background: #1A1A1A; Text-Align: Start }
+#widget>div>div:First-Child>table td:Nth-Child(n+6){ Background-Image: Repeating-Linear-Gradient(To Bottom Right, Transparent 0PX, Transparent .5PX, #686868 1PX, #686868 1.5PX, Transparent 2PX) }
+#widget>div>div:First-Child>table td>b{ Display: Block; Margin-Inline-End: Auto; Border: Thin #F3DEE3 Solid; Padding: 2PX; Width: 3CH; Color: #1A1A1A; Background: #F3DEE3; Box-Shadow: Inset -1PX -1PX CurrentColor; Font-Style: Italic; Text-Align: Center }
+#widget>div>div:First-Child>table td>small{ Display: Block; Position: Absolute; Inset-Block-End: 0; Inset-Inline-End: 0; Margin-Block-Start: Auto; Margin-Inline-Start: Auto; Border-Block-Start: Thin Dashed; Border-Inline-Start: Thin Dashed; Padding-Inline: .5CH; Width: Max-Content; Max-Width: 100%; Color: #F3DEE3; Background: #1A1A1A; Font-Size: .75EM; Font-Style: Italic }
+#widget>div>div:First-Child>table td.today{ Box-Shadow: 1PX 1PX #700020 }
+#widget>div>div:First-Child>table td.today>b{ Color: #992244 }
+#widget>div>div:First-Child>table td.today>small{ Background: #700020 }
+#widget>div>div{ Width: 16REM Flex: None}
+]]></style>
+	<meta itemprop="urn:fdc:ladys.computer:20231231:Shu1She4:title" content="Calendar | Lady’s Computer"/>
+	<h1><small><a href="/">Lady’s Computer</a> ∷ </small>Calendar</h1>
+	<!--<details>
+		<summary>About this calendar…</summary>
+	</details>-->
+	<aside id="widget">
+		<template>
+			<h2/>
+			<div>
+				<div>
+					<table>
+						<thead>
+							<tr>
+								<th scope="col">Ⅰ</th>
+								<th scope="col">Ⅱ</th>
+								<th scope="col">Ⅲ</th>
+								<th scope="col">Ⅳ</th>
+								<th scope="col">Ⅴ</th>
+								<th scope="col">Ⅵ</th>
+								<th scope="col">Ⅶ</th>
+								<th scope="col">Ⅷ</th>
+							</tr>
+						</thead>
+						<tbody>
+							<tr/>
+							<tr/>
+							<tr/>
+							<tr/>
+							<tr/>
+						</tbody>
+					</table>
+				</div>
+				<div/>
+			</div>
+			<footer>
+				<button type="button">Previous</button>
+				<button type="button">Current</button>
+				<button type="button">Next</button>
+			</footer>
+		</template>
+		<noscript>Calendar widget requires Javascript!</noscript>
+		<script><![CDATA[#!js
+const widget= document.getElementById("widget")
+const template= widget.querySelector("#widget>template")
+const day= +Date.UTC(1970, 0, 2)
+const today = new Date();
+const dateForDay= (start, month, dayInMonth) => new Date
+(	+start + ((month - 1) * 40 + dayInMonth - 1) * day)
+const td= (start, month, dayInMonth) =>
+{	const elt= document.createElement("td")
+	const date= dateForDay(start, month, dayInMonth)
+	const label= document.createElement("b")
+	label.textContent= `${dayInMonth}`.padStart(2, "0")
+	const caption= document.createElement("small")
+	caption.textContent= `${date.getUTCDate()}`.padStart(2, "0")
+	+	[	" Jan"
+		,	" Feb"
+		,	" Mar"
+		,	" Apr"
+		,	" May"
+		,	" Jun"
+		,	" Jul"
+		,	" Aug"
+		,	" Sep"
+		,	" Oct"
+		,	" Nov"
+		,	" Dec"][date.getUTCMonth()]
+	elt.replaceChildren(label, " ", caption)
+	if
+	(	date.getUTCFullYear() == today.getFullYear()
+	&&	date.getUTCMonth() == today.getMonth()
+	&&	date.getUTCDate() == today.getDate())
+	{	elt.className= "today"}
+	return elt}
+const renderCalendarIncludingDate= (date) =>
+{	const start= new Date
+	(	Date.UTC
+		(	date.getUTCFullYear()
+		-	!	(	date.getUTCMonth() > 8
+				||	date.getUTCMonth() == 8 && date.getUTCDate() >= 22)
+		,	8
+		,	22))
+	const dayInYear= Math.floor
+	(	(	Date.UTC
+			(	date.getUTCFullYear(), date.getUTCMonth(), date.getUTCDate())
+		-	start)
+	/	day)
+	const month= Math.floor(dayInYear / 40) + 1
+	const view= template.content.cloneNode(true)
+	const year= start.getUTCFullYear() - 1999
+	if (month == 10)
+	{ const title= document.createElement("i")
+		title.textContent= "Fetes"
+		view.querySelector("h2").replaceChildren(title, ` ${year}`)}
+	else
+	{	const tide= document.createElement("i")
+		tide.textContent= month == 5 ? "·en·tide" : "·tide"
+		view.querySelector("h2").replaceChildren
+		(	[	"Lake"
+			, "Hallow"
+			, "Yule"
+			, "Carnival"
+			, "Lent"
+			, "Eastre"
+			, "Lithe"
+			, "Lammas"
+			, "Weod"][month - 1] ?? month
+		,	tide
+		,	` ${year}`)}
+	const calendar= view.querySelector("table")
+	const intercalaryDays= 5
+	+	(	new Date
+			(	Date.UTC(start.getUTCFullYear() + 1) + Date.UTC(1970, 2, 1))
+			.	getUTCMonth()
+		===	1)
+	if (month == 10)
+	{	calendar.tHead.rows[0].replaceChildren
+		(	...[	...calendar.tHead.rows[0].cells].slice(0, intercalaryDays))
+		calendar.tBodies[0].rows[0].replaceChildren
+		(	...new Array(intercalaryDays).fill().map
+			(	(_, n) => td(start, 10, n + 1)))
+		calendar.tBodies[0].replaceChildren(calendar.tBodies[0].rows[0])}
+	else
+	{	[...calendar.tBodies[0].rows].forEach
+		(	(row, m) => row.replaceChildren
+			(	...new Array(8).fill().map
+				(	(_, n) => td(start, month, m * 8 + n + 1))))}
+	view.querySelector("button:First-Child").addEventListener
+	(	"click"
+	,	() => renderCalendarIncludingDate
+		(	new Date(+dateForDay(start, month, 1) - 1 * day)))
+	view.querySelector
+	(	"button:Not(:First-Child):Not(:Last-Child)")
+	.	addEventListener
+		(	"click"
+		,	() => renderCalendarIncludingDate
+			(	new Date
+				(	Date.UTC
+					(	today.getFullYear(), today.getMonth(), today.getDate()))))
+	view.querySelector("button:Last-Child").addEventListener
+	(	"click"
+	,	() => renderCalendarIncludingDate
+		(	new Date
+			(	+dateForDay(start, month, 1)
+			+	(month == 10 ? intercalaryDays : 40) * day)))
+	widget.replaceChildren(view)}
+renderCalendarIncludingDate
+(	new Date
+	(	Date.UTC(today.getFullYear(), today.getMonth(), today.getDate())))
+]]></script>
+	</aside>
+</article>