feat$(glossary): Add librarian script

scripts/glossary/library.js

@@ -0,0 +1,54 @@
+/*
+  This is the "librarian" script that generates the glossary/README file.
+  Run using `npm run glossary:librarian`.
+*/
+
+const fs = require('fs-extra');
+const chalk = require('chalk');
+const util = require('../util');
+
+const glossaryFiles = util.getFilesInDir('./glossary', true, ['keyword_database', 'README.md']);
+const fileTitles = [];
+
+const getGlossaryTermMarkdownBlock = (fileName) => {
+	let fileContent = fs.readFileSync(fileName, 'utf8');
+	let title = fileContent.match(/###[^\n]*/)[0].replace('### ', '');
+
+	fileTitles.push(title);
+	return fileContent.trim() + "\n";
+}
+
+const glossaryFilesContentReducer = (accumulator, currentFilename) => {
+	// handle first array item
+	if (accumulator === glossaryFiles[0]) {
+		return getGlossaryTermMarkdownBlock(accumulator) + "\n" + getGlossaryTermMarkdownBlock(currentFilename);
+	}
+	return accumulator + "\n" + getGlossaryTermMarkdownBlock(currentFilename);
+}
+
+const getTermLinkMarkdownBlock = (termTitle) => {
+	let anchor = util.getMarkDownAnchor(termTitle);
+	return `* [\`${termTitle}\`](#${anchor})` + "\n";
+}
+
+const glossaryTableOfContentsReducer = (accumulator, currentFile) => {
+	if (accumulator === fileTitles[0]) {
+		return getTermLinkMarkdownBlock(accumulator) + getTermLinkMarkdownBlock(currentFile);
+	}
+	return accumulator + getTermLinkMarkdownBlock(currentFile);
+}
+
+try {
+	const fileContents = glossaryFiles.reduce(glossaryFilesContentReducer);
+	const TOC = "## Table of Contents\n\n" + fileTitles.reduce(glossaryTableOfContentsReducer);
+	
+	const README =
+		"# 30-seconds-of-code JavaScript Glossary\n\n" +
+		TOC +
+		"\n\n" +
+		fileContents;
+  fs.writeFileSync('glossary/README.md', README);	
+} catch (err) {
+	console.log(`${chalk.red('ERROR!')} During glossary README generation: ${err}`);
+  process.exit(1);
+}