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gatsby-node.js
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gatsby-node.js
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const { createFilePath } = require(`gatsby-source-filesystem`)
const path = require(`path`)
const kebabCase = require(`lodash.kebabcase`)
exports.createPages = ({ graphql, actions }) => {
const { createPage } = actions
const blogLayout = path.resolve(`./src/layouts/blog-post.js`)
const blogListLayout = path.resolve(`./src/layouts/blog-list.js`)
const blogCategoryLayout = path.resolve(`./src/layouts/blog-category.js`)
const blogAuthorLayout = path.resolve(`./src/layouts/blog-author.js`)
return graphql(`
query blogPosts {
allMarkdownRemark(sort: { fields: [frontmatter___date], order: DESC }) {
edges {
node {
fields {
slug
}
frontmatter {
title
date
author
category
featured
image {
childImageSharp {
fluid {
src
}
}
}
}
html
}
}
}
}
`).then(result => {
if (result.errors) {
console.error(result.errors)
reject(result.errors)
}
const posts = result.data.allMarkdownRemark.edges
const postsPerPage = 3
const postsWithoutFeatured = posts.filter(({ node }) => {
return !node.frontmatter.featured
})
const numPages = Math.ceil(postsWithoutFeatured.length / postsPerPage)
const categories = []
const authors = []
// Creating blog list with pagination
Array.from({ length: numPages }).forEach((_, i) => {
createPage({
path: i === 0 ? `/blog` : `/blog/page/${i + 1}`,
component: blogListLayout,
context: {
limit: postsPerPage,
skip: i * postsPerPage,
currentPage: i + 1,
numPages,
},
})
})
// Creating blog posts
posts.forEach((post, index, arr) => {
post.node.frontmatter.category.forEach(cat => categories.push(cat))
authors.push(post.node.frontmatter.author)
const prev = arr[index - 1]
const next = arr[index + 1]
createPage({
path: post.node.fields.slug,
component: blogLayout,
context: {
slug: post.node.fields.slug,
prev: prev,
next: next,
},
})
})
// Creating category page
const countCategories = categories.reduce((prev, curr) => {
prev[curr] = (prev[curr] || 0) + 1
return prev
}, {})
const allCategories = Object.keys(countCategories)
allCategories.forEach((cat, i) => {
const link = `/blog/category/${kebabCase(cat)}`
Array.from({
length: Math.ceil(countCategories[cat] / postsPerPage),
}).forEach((_, i) => {
createPage({
path: i === 0 ? link : `${link}/page/${i + 1}`,
component: blogCategoryLayout,
context: {
allCategories: allCategories,
category: cat,
limit: postsPerPage,
skip: i * postsPerPage,
currentPage: i + 1,
numPages: Math.ceil(countCategories[cat] / postsPerPage),
},
})
})
})
// Creating author page
const countAuthor = authors.reduce((prev, curr) => {
prev[curr] = (prev[curr] || 0) + 1
return prev
}, {})
const allAuthors = Object.keys(countAuthor)
allAuthors.forEach((aut, i) => {
const link = `/blog/author/${kebabCase(aut)}`
Array.from({
length: Math.ceil(countAuthor[aut] / postsPerPage),
}).forEach((_, i) => {
createPage({
path: i === 0 ? link : `${link}/page/${i + 1}`,
component: blogAuthorLayout,
context: {
allAuthors: allAuthors,
author: aut,
limit: postsPerPage,
skip: i * postsPerPage,
currentPage: i + 1,
numPages: Math.ceil(countAuthor[aut] / postsPerPage),
},
})
})
})
})
}
exports.onCreateNode = ({ node, actions, getNode }) => {
const { createNodeField } = actions
if (node.internal.type === `MarkdownRemark`) {
const value = createFilePath({ node, getNode })
const [month, day, year] = new Date(node.frontmatter.date)
.toLocaleDateString("en-EN", {
year: "numeric",
month: "2-digit",
day: "2-digit",
})
.split("/")
const slug = value.replace("/blog/", "").replace(/\/$/, "")
const url = `/blog/${year}/${month}/${day}${slug}`
createNodeField({
name: `slug`,
node,
value: url,
})
}
}