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gatsby-node.js
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gatsby-node.js
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const path = require(`path`)
const _ = require('lodash')
const { createFilePath } = require(`gatsby-source-filesystem`)
exports.createPages = ({ graphql, actions }) => {
const { createPage } = actions
const blogPost = path.resolve(`./src/templates/blog-post.tsx`)
const blogList = path.resolve(`./src/templates/blog-list.tsx`)
const tagTemplate = path.resolve(`./src/templates/tags.tsx`)
return graphql(
`
{
allMarkdownRemark(
sort: { fields: [frontmatter___date], order: DESC }
limit: 1000
) {
edges {
node {
fields {
slug
}
frontmatter {
title
tags
}
}
}
}
}
`
).then(result => {
if (result.errors) {
throw result.errors
}
// Create blog posts pages.
const posts = result.data.allMarkdownRemark.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: post.node.fields.slug,
component: blogPost,
context: {
slug: post.node.fields.slug,
previous,
next,
tag: post.node.frontmatter.tags,
},
})
})
// Create blog post list pages
const postsPerPage = 30
const numPages = Math.ceil(posts.length / postsPerPage)
Array.from({ length: numPages }).forEach((_, i) => {
createPage({
path: i === 0 ? `/page/1` : `/page/${i + 1}`,
component: blogList,
context: {
limit: postsPerPage,
skip: i * postsPerPage,
numPages,
currentPage: i + 1,
},
})
})
// Tag pages:
let tags = []
// Iterate through each post, putting all found tags into `tags`
_.each(posts, edge => {
if (_.get(edge, 'node.frontmatter.tags')) {
tags = tags.concat(edge.node.frontmatter.tags)
}
})
// Eliminate duplicate tags
tags = _.uniq(tags)
// Make tag pages
tags.forEach(tag => {
createPage({
path: `/tags/${_.kebabCase(tag)}/`,
component: tagTemplate,
context: {
tag,
},
})
})
return null
})
}
exports.onCreateNode = ({ node, actions, getNode }) => {
const { createNodeField } = actions
if (node.internal.type === `MarkdownRemark`) {
const value = createFilePath({ node, getNode })
if (typeof node.frontmatter.slug !== 'undefined') {
createNodeField({
node,
name: 'slug',
value: node.frontmatter.slug,
})
} else {
const value = createFilePath({ node, getNode })
createNodeField({
node,
name: 'slug',
value,
})
}
}
}
// for React-Hot-Loader: react-🔥-dom patch is not detected
exports.onCreateWebpackConfig = ({ getConfig, stage }) => {
const config = getConfig()
if (stage.startsWith('develop') && config.resolve) {
config.resolve.alias = {
...config.resolve.alias,
'react-dom': '@hot-loader/react-dom',
}
}
}