Split out frontmatter getters

src/frontmatter/categories.js

@@ -0,0 +1,13 @@
+const settings = require('../settings');
+
+module.exports = (post) => {
+	if (!post.data.category) {
+		return [];
+	}
+
+	const categories = post.data.category
+		.filter(category => category.$.domain === 'category')
+		.map(({ $: attributes }) => decodeURIComponent(attributes.nicename));
+
+  return categories.filter(category => !settings.filter_categories.includes(category));
+};

src/frontmatter/coverImage.js

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+module.exports = (post) => {
+  return post.meta.coverImage;
+};

src/frontmatter/date.js

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+const luxon = require('luxon');
+
+const settings = require('../settings');
+
+module.exports = (post) => {
+	const dateTime = luxon.DateTime.fromRFC2822(post.data.pubDate[0], { zone: 'utc' });
+
+	if (settings.custom_date_formatting) {
+		return dateTime.toFormat(settings.custom_date_formatting);
+	} else if (settings.include_time_with_date) {
+		return dateTime.toISO();
+	} else {
+		return dateTime.toISODate();
+	}
+};

src/frontmatter/tags.js

@@ -0,0 +1,13 @@
+const settings = require('../settings');
+
+module.exports = (post) => {
+	if (!post.data.category) {
+		return [];
+	}
+
+	const categories = post.data.category
+		.filter(category => category.$.domain === 'post_tag')
+		.map(({ $: attributes }) => decodeURIComponent(attributes.nicename));
+
+  return categories;
+};

src/frontmatter/title.js

@@ -0,0 +1,3 @@
+module.exports = (post) => {
+  return post.data.title[0];
+};