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gatsby-node.js
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gatsby-node.js
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/* eslint-env node */
const path = require(`path`)
const { createFilePath } = require(`gatsby-source-filesystem`)
exports.createPages = ({ graphql, actions }) => {
const { createPage } = actions
return new Promise((resolve, reject) => {
const blogPost = path.resolve(`./src/templates/blog-post.jsx`)
const blogPostAMP = path.resolve(`./src/templates/blog-post.amp.jsx`)
const blogPostList = path.resolve(`./src/templates/index.jsx`)
const blogTaggedPostList = path.resolve(`./src/templates/tagged-posts.jsx`)
resolve(
graphql(
`
{
allMarkdownRemark(
sort: { fields: [frontmatter___date], order: DESC }
limit: 1000
) {
edges {
node {
fields {
slug
}
frontmatter {
title
tags
}
}
}
}
}
`
).then(result => {
if (result.errors) {
console.log(result.errors)
reject(result.errors)
}
const posts = result.data.allMarkdownRemark.edges
// Create list of posts pages
// https://www.gatsbyjs.org/docs/adding-pagination/
const postsPerPage = 10
const numPages = Math.ceil(posts.length / postsPerPage)
Array.from({ length: numPages }).forEach((_, index) => {
const withPrefix = pageNumber =>
pageNumber === 1 ? `/` : `/page/${pageNumber}`
const pageNumber = index + 1
createPage({
path: withPrefix(pageNumber),
component: blogPostList,
context: {
limit: postsPerPage,
skip: index * postsPerPage,
current: pageNumber,
total: numPages,
hasNext: pageNumber < numPages,
nextPath: withPrefix(pageNumber + 1),
hasPrev: index > 0,
prevPath: withPrefix(pageNumber - 1),
},
})
})
// Create list of tagged posts pages
const tags = posts.reduce(
(tagsSet, post) =>
new Set([...tagsSet, ...new Set(post.node.frontmatter.tags)]),
new Set()
)
Array.from(tags).forEach(tag => {
const escape = tagName => tagName.replace(/(#|\?)/g, '')
const withPrefix = tagName => `/tag/${escape(tagName)}`
createPage({
path: withPrefix(tag),
component: blogTaggedPostList,
context: {
tag: tag,
},
})
})
// Create blog posts pages.
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: `/post${post.node.fields.slug}`,
component: blogPost,
context: {
slug: post.node.fields.slug,
previous,
next,
},
})
createPage({
path: `/amp/post${post.node.fields.slug}`,
component: blogPostAMP,
context: {
amp: true,
slug: post.node.fields.slug,
previous,
next,
},
})
})
})
)
})
}
exports.onCreateNode = ({ node, actions, getNode }) => {
const { createNodeField } = actions
if (node.internal.type === `MarkdownRemark`) {
const value = createFilePath({ node, getNode })
createNodeField({
name: `slug`,
node,
value,
})
}
}