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gatsby-node.js
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const path = require('path');
const fs = require('fs');
const { promisify } = require('util');
const { createFilePath } = require('gatsby-source-filesystem');
const rename = promisify(fs.rename);
const writeFile = promisify(fs.writeFile);
exports.onCreateNode = ({ node, boundActionCreators, getNode }) => {
const { createNodeField } = boundActionCreators;
if (node.internal.type === 'MarkdownRemark') {
const slug = createFilePath({
node,
getNode,
trailingSlash: false,
});
createNodeField({
node,
name: 'slug',
value: slug === '/' ? '/docs' : `/docs${slug}`,
});
}
};
exports.createPages = async ({ graphql, boundActionCreators }) => {
const { createPage } = boundActionCreators;
const lessonPage = path.resolve('src/templates/docs.jsx');
const result = await graphql(`
{
allMarkdownRemark {
edges {
node {
fields {
slug
}
}
}
}
}
`);
if (result.errors) {
throw new Error(result.errors);
}
result.data.allMarkdownRemark.edges.forEach(edge => {
createPage({
path: edge.node.fields.slug,
component: lessonPage,
context: {
slug: edge.node.fields.slug,
},
});
});
};
exports.onPostBuild = ({ store }) =>
Promise.all(
store.getState().pages.map(async ({ path: p }) => {
// Don't change the homepage.
if (p === '/') return Promise.resolve();
// Don't allow paths that already end with .html or with a slash.
if (/(\.html?|\/)$/i.test(p)) {
throw new Error(
`The path ${p} ends with .html or a slash. Please change it's path.`,
);
}
// Get the generated file.
const fullPath = path.resolve(`public${p}/index.html`);
if (!fullPath) {
throw new Error(`The page ${p} could not be found.`);
}
// Rename the generated file from docs/index.html to docs.html
await rename(fullPath, fullPath.replace('/index.html', '.html'));
// Create a redirect from the version with a slash.
return writeFile(
fullPath,
`<!DOCTYPE html>
<html lang="en-US">
<meta charset="utf-8">
<title>Redirecting…</title>
<link rel="canonical" href="${p}">
<meta http-equiv="refresh" content="0; url=${p}">
<meta name="robots" content="noindex">
<h1>Redirecting…</h1>
<a href="${p}">Click here if you are not redirected.</a>
<script>location="${p}"</script>
</html>`.replace(/(\r\n|\r|\n)+( )+/g, ''),
);
}),
);