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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`)
const srcPath = (...parts) => path.join(__dirname, "src", ...parts)
const regexPath = (...parts) => `/${srcPath(...parts)}//`
const sourceFilesystemFilters = {
posts: {
fileAbsolutePath: {
regex: regexPath("posts"),
},
fields: { draft: { eq: false } },
},
projects: {
fileAbsolutePath: {
regex: regexPath("projects"),
},
fields: { draft: { eq: false } },
},
}
const findRelatedPosts = ({ post, posts }) => {
const otherPosts = _.reject(posts, (p) => p.fields.slug === post.fields.slug)
const relatedPosts = _.chain(otherPosts)
.map((p) => ({
...p,
// Related posts are included based on the number of shared tags
relatedPosts: _.intersection(p.frontmatter.tags, post.frontmatter.tags),
}))
// Filter out posts with no shared tags
.filter((p) => p.relatedPosts.length)
// And order by the ones with the most shared tags
// The original order of posts is by descending date so that will be the fallback
.orderBy((p) => p.relatedPosts.length, "desc")
// Get the top 3
.slice(0, 3)
// Fill out the rest of the array with first 3 posts (which are by date desc)
.thru((arr) => [...arr, ...otherPosts.slice(0, 3 - arr.length)])
.value()
return relatedPosts
}
const fixDeepLinksInExcerpts = (post) => {
// In excerpts, replace in-post links with a link to the post+the link
// so thats links from listing pages work
post.excerpt = post.excerpt.replace(
/href="#([\w-]+)"/gi,
`href="${post.fields.slug}#$1"`
)
}
const createPostPages = ({ actions, posts }) => {
posts.forEach((post) => {
fixDeepLinksInExcerpts(post)
actions.createPage({
path: post.fields.slug,
component: path.resolve(`src/templates/post.js`),
context: {
slug: post.fields.slug,
relatedPosts: findRelatedPosts({ post, posts }),
},
})
})
}
const createPostTagPages = ({ actions, posts }) => {
posts
.reduce(
(acc, post) =>
post.frontmatter.tags.reduce((acc, tag) => acc.add(tag), acc),
new Set()
)
.forEach((tag) => {
actions.createPage({
path: `/tags/${tag}`,
component: path.resolve(`src/templates/shortPostListing.js`),
context: {
title: `Tag: ${tag}`,
filter: {
frontmatter: { tags: { in: [tag] } },
...sourceFilesystemFilters.posts,
},
},
})
})
}
const createPostListingPages = ({ actions, posts, limit = 5 }) => {
const totalPages = Math.ceil(posts.length / limit)
Array.from({ length: totalPages }).forEach((_, i) => {
const currentPage = i + 1
actions.createPage({
path: currentPage === 1 ? "/" : `/page${currentPage}`,
component: path.resolve(`src/templates/postListing.js`),
context: {
title: currentPage === 1 ? "Home" : `Page ${currentPage}`,
limit,
skip: i * limit,
totalPages,
currentPage,
filter: {
...sourceFilesystemFilters.posts,
},
},
})
})
actions.createPage({
path: `/full`,
component: path.resolve(`src/templates/shortPostListing.js`),
context: {
title: `All Posts`,
filter: {
...sourceFilesystemFilters.posts,
},
},
})
}
const createPostFields = ({ actions, node, getNode }) => {
const { createNodeField } = actions
const filename = createFilePath({ node, getNode })
// get the date and title from the file name
const [, date, title] = filename.match(
/^\/([\d]{4}-[\d]{2}-[\d]{2})-{1}(.+)\/$/
)
const dateSlug = date.replace(/-/g, "/")
node.frontmatter.tags = Array.isArray(node.frontmatter.tags)
? node.frontmatter.tags.map((t) => t.replace(/\s/g, "-"))
: []
createNodeField({ node, name: `slug`, value: `/${dateSlug}/${title}` })
}
const createProjectPages = ({ actions, projects }) => {
projects.forEach((project) => {
actions.createPage({
path: project.fields.slug,
component: path.resolve(`src/templates/project.js`),
context: {
slug: project.fields.slug,
},
})
})
}
const createProjectListingPages = ({ actions }) => {
actions.createPage({
path: `/projects`,
component: path.resolve(`src/templates/projectListing.js`),
context: {
title: `Projects`,
filter: {
...sourceFilesystemFilters.projects,
},
},
})
}
const createProjectFields = ({ actions, node, getNode }) => {
const { createNodeField } = actions
const filename = createFilePath({ node, getNode })
const title = path.basename(filename, ".md")
createNodeField({ node, name: `slug`, value: `/projects/${title}` })
}
exports.createPages = async ({ graphql, actions, reporter }) => {
const stringify = (obj) => JSON.stringify(obj).replace(/"([^"]+)":/g, "$1:")
const results = await graphql(`
query {
Posts: allMarkdownRemark(
filter: ${stringify(sourceFilesystemFilters.posts)}
sort: { order: DESC, fields: [frontmatter___date] }
) {
edges {
node {
html
excerpt(format: HTML)
fields {
slug
}
frontmatter {
tags
title
date
prettyDate: date(formatString: "MMMM DD, YYYY")
}
}
}
}
Projects: allMarkdownRemark(
filter: ${stringify(sourceFilesystemFilters.projects)}
sort: { order: DESC, fields: [frontmatter___title] }
) {
edges {
node {
html
fields {
slug
}
}
}
}
}
`)
if (results.errors) {
reporter.panicOnBuild(results.errors)
return
}
const posts = results.data.Posts.edges.map((n) => n.node)
createPostListingPages({ actions, posts })
createPostTagPages({ actions, posts })
createPostPages({ actions, posts })
const projects = results.data.Projects.edges.map((n) => n.node)
createProjectListingPages({ actions, projects })
createProjectPages({ actions, projects })
}
exports.onCreateNode = ({ node, ...rest }) => {
if (node.internal.type === `MarkdownRemark`) {
if (node.frontmatter.date) {
createPostFields({ node, ...rest })
} else {
createProjectFields({ node, ...rest })
}
}
}