Relocate more general purposes snippets from 5ePHB to Blank

Should include all supporting style content.

themes/V3/Blank/snippets/tableOfContents.gen.js

@@ -0,0 +1,77 @@
+const _ = require('lodash');
+const dedent = require('dedent-tabs').default;
+
+const getTOC = (pages)=>{
+
+	const recursiveAdd = (title, page, targetDepth, child, curDepth=0)=>{
+		if(curDepth > 5) return; // Something went wrong.
+		if(curDepth == targetDepth) {
+			child.push({
+				title    : title,
+				page     : page,
+				children : []
+			});
+		} else {
+			if(child.length == 0) {
+				child.push({
+					title    : null,
+					page     : page,
+					children : []
+				});
+			}
+			recursiveAdd(title, page, targetDepth, _.last(child).children, curDepth+1,);
+		}
+	};
+
+	const res = [];
+
+	const iframe = document.getElementById('BrewRenderer');
+	const iframeDocument = iframe.contentDocument || iframe.contentWindow.document;
+	const headings = iframeDocument.querySelectorAll('h1, h2, h3, h4, h5, h6');
+	const headerDepth = ['H1', 'H2', 'H3', 'H4', 'H5', 'H6'];
+
+	_.each(headings, (heading)=>{
+		const onPage = parseInt(heading.closest('.page').id?.replace(/^p/, ''));
+		const ToCExclude = getComputedStyle(heading).getPropertyValue('--TOC');
+
+		if(ToCExclude != 'exclude') {
+			recursiveAdd(heading.textContent.trim(), onPage, headerDepth.indexOf(heading.tagName), res);
+		}
+	});
+	return res;
+};
+
+
+const ToCIterate = (entries, curDepth=0)=>{
+	const levelPad = ['- ###', '  - ####', '    - ', '      - ', '        - ', '          - '];
+	const toc = [];
+	if(entries.title !== null){
+		toc.push(`${levelPad[curDepth]} [{{ ${entries.title}}}{{ ${entries.page}}}](#p${entries.page})`);
+	}
+	if(entries.children.length) {
+		_.each(entries.children, (entry, idx)=>{
+			const children = ToCIterate(entry, entry.title == null ? curDepth : curDepth+1);
+			if(children.length) {
+				toc.push(...children);
+			}
+		});
+	}
+	return toc;
+};
+
+module.exports = function(props){
+	const pages = props.brew.text.split('\\page');
+	const TOC = getTOC(pages);
+	const markdown = _.reduce(TOC, (r, g1, idx1)=>{
+		r.push(ToCIterate(g1).join('\n'));
+		return r;
+	}, []).join('\n');
+
+	return dedent`
+		{{toc,wide
+		# Contents
+
+		${markdown}
+		}}
+		\n`;
+};