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gatsby-node.js
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/* eslint-disable strict, camelcase */
'use strict';
const path = require('path');
const { createFilePath } = require('gatsby-source-filesystem');
// Regex to parse date and title from the filename
const BLOG_POST_SLUG_REGEX = /^\/updates\/([\d]{4})-([\d]{2})-([\d]{2})/;
exports.onCreateNode = ({ node, getNode, actions }) => {
const { createNodeField } = actions;
if (node.internal.type === `MarkdownRemark`) {
const { permalink, redirect_from, date, layout } = node.frontmatter;
const relativePath = createFilePath({ node, getNode, basePath: 'pages' });
let slug = permalink;
if (!slug && relativePath.includes('updates')) {
// Generate final path + graphql fields for blog posts
const match = BLOG_POST_SLUG_REGEX.exec(relativePath);
const year = match[1];
const month = match[2];
const day = match[3];
const generatedDate = new Date(Number(year), Number(month) - 1, Number(day));
// Blog posts are sorted by date and display the date in their header.
createNodeField({
node,
name: 'date',
value: date || generatedDate.toJSON(),
});
}
if (!slug) {
slug = relativePath;
}
// Used to generate URL to view this content.
createNodeField({
node,
name: `slug`,
value: slug,
});
// Used to determine a page layout.
createNodeField({
node,
name: 'layout',
value: layout || '',
});
// Used by createPages() to register redirects.
createNodeField({
node,
name: 'redirect',
value: redirect_from ? JSON.stringify(redirect_from) : '',
});
}
};
exports.createPages = ({ graphql, actions }) => {
const { createPage, createRedirect } = actions;
// Used to detect and prevent duplicate redirects
const redirectToSlugMap = {};
return new Promise((resolve, reject) => {
graphql(
`
{
allMarkdownRemark(limit: 1000) {
edges {
node {
fields {
redirect
slug
layout
}
}
}
}
}
`
).then(result => {
if (result.errors) {
reject(result.errors);
}
result.data.allMarkdownRemark.edges.forEach(({ node }) => {
const { slug, layout, redirect } = node.fields;
createPage({
path: slug,
// Feel free to set any `layout` as you'd like in the frontmatter, as
// long as the corresponding template file exists in src/templates.
// If no template is set, it will fall back to the default `page`
// template. (Hardcoded for `.js` file extension!)
component: path.resolve(`./src/templates/${layout || 'page'}.js`),
context: {
// Data passed to context is available in page queries as GraphQL variables.
slug,
},
});
// URL redirect handler
// Adapted from reactjs/reactjs.org:
// https://github.com/reactjs/reactjs.org/blob/master/gatsby-node.js#L111
if (redirect) {
let toRedirect = JSON.parse(node.fields.redirect);
if (!Array.isArray(toRedirect)) {
toRedirect = [toRedirect];
}
toRedirect.forEach(fromPath => {
if (redirectToSlugMap[fromPath] != null) {
reject(
new Error(
`Duplicate redirect detected from "${fromPath}" to:\n` +
`* ${redirectToSlugMap[fromPath]}\n` +
`* ${slug}\n`
)
);
}
// A leading "/" is required for redirects to work,
// But multiple leading "/" will break redirects.
// For more context see github.com/reactjs/reactjs.org/pull/194
const toPath = slug.startsWith('/') ? slug : `/${slug}`;
redirectToSlugMap[fromPath] = slug;
createRedirect({
fromPath: `/${fromPath}`,
redirectInBrowser: true,
toPath,
});
});
}
});
resolve();
});
});
};