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gatsby-node.js
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gatsby-node.js
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/* eslint "no-console": "off" */
const path = require("path");
const _ = require("lodash");
const moment = require("moment");
const siteConfig = require("./data/SiteConfig");
/**
* From Starter Files
*/
exports.onCreateNode = ({ node, actions, getNode }) => {
const { createNodeField } = actions;
let slug;
if (node.internal.type === "MarkdownRemark") {
const fileNode = getNode(node.parent);
const parsedFilePath = path.parse(fileNode.relativePath);
if (
Object.prototype.hasOwnProperty.call(node, "frontmatter") &&
Object.prototype.hasOwnProperty.call(node.frontmatter, "title")
) {
slug = `/${_.kebabCase(node.frontmatter.title)}`;
} else if (parsedFilePath.name !== "index" && parsedFilePath.dir !== "") {
slug = `/${parsedFilePath.dir}/${parsedFilePath.name}/`;
} else if (parsedFilePath.dir === "") {
slug = `/${parsedFilePath.name}/`;
} else {
slug = `/${parsedFilePath.dir}/`;
}
if (Object.prototype.hasOwnProperty.call(node, "frontmatter")) {
if (Object.prototype.hasOwnProperty.call(node.frontmatter, "slug"))
slug = `/${_.kebabCase(node.frontmatter.slug)}`;
if (Object.prototype.hasOwnProperty.call(node.frontmatter, "date")) {
const date = moment(node.frontmatter.date, siteConfig.dateFromFormat);
if (!date.isValid)
console.warn(`WARNING: Invalid date.`, node.frontmatter);
createNodeField({ node, name: "date", value: date.toISOString() });
}
}
createNodeField({ node, name: "slug", value: slug });
}
};
/**
* From Starter Files
* This generates the pages from the templates
*/
exports.createPages = async ({ graphql, actions }) => {
const { createPage } = actions;
const postPage = path.resolve("src/templates/post.jsx");
const tagPage = path.resolve("src/templates/tag.jsx");
const categoryPage = path.resolve("src/templates/category.jsx");
const listingPage = path.resolve("./src/templates/listing.jsx");
// const landingPage = path.resolve("./src/templates/landing.jsx"); // controlled by site.config.js
// Get a full list of markdown posts
const markdownQueryResult = await graphql(`
{
allMarkdownRemark {
edges {
node {
fields {
slug
}
frontmatter {
title
tags
category
date
shortDescription
episodeNumber
audioPath
}
}
}
}
}
`);
if (markdownQueryResult.errors) {
console.error(markdownQueryResult.errors);
throw markdownQueryResult.errors;
}
const tagSet = new Set();
const categorySet = new Set();
const postsEdges = markdownQueryResult.data.allMarkdownRemark.edges;
// Sort posts
postsEdges.sort((postA, postB) => {
const dateA = moment(
postA.node.frontmatter.date,
siteConfig.dateFromFormat
);
const dateB = moment(
postB.node.frontmatter.date,
siteConfig.dateFromFormat
);
if (dateA.isBefore(dateB)) return 1;
if (dateB.isBefore(dateA)) return -1;
return 0;
});
// Paging
const { postsPerPage } = siteConfig;
if (postsPerPage) {
const pageCount = Math.ceil(postsEdges.length / postsPerPage);
[...Array(pageCount)].forEach((_val, pageNum) => {
createPage({
path: pageNum === 0 ? `/` : `/${pageNum + 1}/`,
component: listingPage,
context: {
limit: postsPerPage,
skip: pageNum * postsPerPage,
pageCount,
currentPageNum: pageNum + 1
}
});
});
} else {
// Load the landing page instead
createPage({
path: `/`,
// component: landingPage // controled by siteconfig.js
component: listingPage
});
}
// Post page creating
postsEdges.forEach((edge, index) => {
// Generate a list of tags
if (edge.node.frontmatter.tags) {
edge.node.frontmatter.tags.forEach(tag => {
tagSet.add(tag);
});
}
// Generate a list of categories
if (edge.node.frontmatter.category) {
categorySet.add(edge.node.frontmatter.category);
}
// Create post pages
const nextID = index + 1 < postsEdges.length ? index + 1 : 0;
const prevID = index - 1 >= 0 ? index - 1 : postsEdges.length - 1;
const nextEdge = postsEdges[nextID];
const prevEdge = postsEdges[prevID];
createPage({
path: edge.node.fields.slug,
component: postPage,
context: {
audioPath: edge.node.frontmatter.audioPath,
shortDescription: edge.node.frontmatter.shortDescription,
episodeNumber: edge.node.frontmatter.episodeNumber,
slug: edge.node.fields.slug,
nexttitle: nextEdge.node.frontmatter.title,
nextslug: nextEdge.node.fields.slug,
prevtitle: prevEdge.node.frontmatter.title,
prevslug: prevEdge.node.fields.slug
}
});
});
// Create tag pages
tagSet.forEach(tag => {
createPage({
path: `/tags/${_.kebabCase(tag)}/`,
component: tagPage,
context: { tag }
});
});
// Create category pages
categorySet.forEach(category => {
createPage({
path: `/categories/${_.kebabCase(category)}/`,
component: categoryPage,
context: { category }
});
});
};