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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 _ = require(`lodash`)
// Creates the slugs for the markdown files
exports.onCreateNode = ({ node, actions, getNode }) => {
const { createNodeField } = actions
if (node.internal.type === `Mdx`) {
const value = createFilePath({ node, getNode })
createNodeField({
name: `slug`,
node,
value,
})
}
}
// Creates pages
exports.createPages = async ({ graphql, actions }) => {
const { createPage } = actions
// Get all blog entries
const result = await graphql(
`
{
allMdx(
sort: { fields: [frontmatter___date], order: DESC }
limit: 1000
filter: { frontmatter: { draft: { ne: true } } }
) {
edges {
node {
fields {
slug
}
frontmatter {
title
tags
}
}
}
}
}
`
)
if (result.errors) {
throw result.errors
}
// Create blog posts pages.
const blogTemplate = path.resolve(`./src/templates/blogPost.js`)
const posts = result.data.allMdx.edges
posts.forEach((post, index) => {
const previous = index === posts.length - 1 ? null : posts[index + 1].node
const next = index === 0 ? null : posts[index - 1].node
createPage({
path: `blog${post.node.fields.slug}`,
component: blogTemplate,
context: {
slug: post.node.fields.slug,
previous,
next,
},
})
})
// Create blog-list pages
const blogListTemplate = path.resolve(`./src/templates/blogList.js`)
const postsPerPage = 10
const numPages = Math.ceil(posts.length / postsPerPage)
Array.from({ length: numPages }).forEach((_, i) => {
createPage({
path: i === 0 ? `/blog` : `/blog/${i + 1}`,
component: blogListTemplate,
context: {
limit: postsPerPage,
skip: i * postsPerPage,
numPages,
currentPage: i + 1,
},
})
})
// Create tag pages:
const tagTemplate = path.resolve(`./src/templates/tag.js`)
let tags = []
// Iterate through each post, putting all found tags into `tags`
_.each(posts, edge => {
if (_.get(edge, "node.frontmatter.tags")) {
tags = tags.concat(edge.node.frontmatter.tags)
}
})
// Eliminate duplicate tags
tags = _.uniq(tags)
// Make tag pages
tags.forEach(tag => {
createPage({
path: `/blog/tags/${_.kebabCase(tag)}/`,
component: tagTemplate,
context: {
tag,
},
})
})
// Create tag-list page
const tagListTemplate = path.resolve(`./src/templates/tagList.js`)
createPage({
path: `/blog/tags`,
component: tagListTemplate,
context: {},
})
}
exports.onCreateWebpackConfig = ({
stage,
rules,
loaders,
plugins,
actions,
}) => {
actions.setWebpackConfig({
node: {
fs: "empty",
},
})
}