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gatsby-node.js
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gatsby-node.js
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const path = require('path');
const { createFilePath } = require('gatsby-source-filesystem');
const { execSync } = require('child_process');
exports.createPages = ({ actions, graphql }) => {
const { createPage } = actions;
const blogPostFilter =
process.env.NODE_ENV === 'development' ? '/data/blog/|/data/dev-blog/' : '/data/blog/';
return graphql(
`
query($posts: String) {
allMarkdownRemark(
filter: { fileAbsolutePath: { regex: $posts } }
limit: 1000
sort: { fields: frontmatter___date }
) {
edges {
next {
fields {
slug
}
frontmatter {
title
}
}
node {
id
fields {
slug
}
frontmatter {
tags
templateKey
}
}
previous {
fields {
slug
}
frontmatter {
title
}
}
}
}
}
`,
{ posts: blogPostFilter }
).then((result) => {
if (result.errors) {
result.errors.forEach((e) => console.error(e.toString()));
return Promise.reject(result.errors);
}
const posts = result.data.allMarkdownRemark.edges;
posts.forEach((edge) => {
const { id } = edge.node;
createPage({
path: `/blog${edge.node.fields.slug}`,
tags: edge.node.frontmatter.tags,
component: path.resolve(`src/templates/${String(edge.node.frontmatter.templateKey)}.js`),
context: {
id,
previous: edge.previous,
next: edge.next,
},
});
});
const postsPerPage = 10;
const numberOfPages = Math.ceil(posts.length / postsPerPage);
Array.from({ length: numberOfPages }).forEach((_, i) => {
createPage({
path: i === 0 ? `/blog` : `/blog/${i + 1}`,
component: path.resolve('src/templates/blog-index.js'),
context: {
limit: postsPerPage,
skip: i * postsPerPage,
numberOfPages,
currentPage: i + 1,
blogPostFilter,
},
});
});
});
};
exports.onCreateNode = ({ node, actions, getNode }) => {
const { createNodeField } = actions;
if (node.internal.type === `MarkdownRemark`) {
const value = createFilePath({ node, getNode });
createNodeField({
name: `slug`,
node,
value,
});
/**
* Solution from Joshua Tzucker
* https://joshuatz.com/posts/2019/gatsby-better-last-updated-or-modified-dates-for-posts/
*/
createNodeField({
node,
name: 'published',
value: execSync(
`git log --pretty=format:%aI --follow -- ${node.fileAbsolutePath} | tail -n 1`
).toString(),
});
/**
* Solution from Angelos Orfanakos
* https://angelos.dev/2019/09/add-support-for-modification-times-in-gatsby/
*/
createNodeField({
node,
name: 'lastModified',
value: execSync(`git log -1 --pretty=format:%aI ${node.fileAbsolutePath}`).toString(),
});
}
};