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gatsby-node.js
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gatsby-node.js
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const { paginate } = require('gatsby-awesome-pagination')
const { forEach, uniq, filter, not, isNil, flatMap } = require('rambdax')
const path = require('path')
const { toKebabCase } = require('./src/helpers')
const pageTypeRegex = /src\/(.*?)\//
const getType = node => node.fileAbsolutePath.match(pageTypeRegex)[1]
const homeTemplate = path.resolve(`./src/templates/index.js`)
const pageTemplate = path.resolve(`./src/templates/page.js`)
const projectsTemplate = path.resolve(`./src/templates/projects.js`)
const postsTemplate = path.resolve(`./src/templates/posts.js`)
const tagsTemplate = path.resolve(`./src/templates/tags.js`)
exports.createPages = ({ actions, graphql, getNodes }) => {
const { createPage } = actions
const allNodes = getNodes()
return graphql(`
{
allMarkdownRemark(
sort: { fields: [frontmatter___date], order: DESC }
limit: 1000
) {
edges {
node {
frontmatter {
path
title
tags
}
fileAbsolutePath
fields {
readingTime {
text
}
}
}
}
}
site {
siteMetadata {
postsPerPage
}
}
}
`).then(result => {
if (result.errors) {
return Promise.reject(result.errors)
}
// create home page
createPage({
path: '/about',
component: homeTemplate,
})
const {
allMarkdownRemark: { edges: markdownPages },
site: { siteMetadata },
} = result.data
/* const sortedPages = markdownPages.sort((pageA, pageB) => {
const typeA = getType(pageA.node)
const typeB = getType(pageB.node)
return (typeA > typeB) - (typeA < typeB)
}) */
const posts = allNodes.filter(
({ internal, fileAbsolutePath }) =>
internal.type === 'MarkdownRemark' &&
fileAbsolutePath.indexOf('/posts/') !== -1,
)
/* const projects = allNodes.filter(
({ internal, fileAbsolutePath }) =>
internal.type === 'MarkdownRemark' &&
fileAbsolutePath.indexOf('/projects/') !== -1,
) */
// Create posts index with pagination
paginate({
createPage,
items: posts,
component: postsTemplate,
itemsPerPage: siteMetadata.postsPerPage,
pathPrefix: '/',
})
/* paginate({
createPage,
items: projects,
component: projectsTemplate,
itemsPerPage: siteMetadata.postsPerPage,
pathPrefix: '/projects',
}) */
// Create each markdown page and post
forEach(({ node }, index) => {
const previous = index === 0 ? null : markdownPages[index - 1].node
const next =
index === markdownPages.length - 1 ? null : markdownPages[index + 1].node
const isNextSameType = getType(node) === (next && getType(next))
const isPreviousSameType =
getType(node) === (previous && getType(previous))
createPage({
path: node.frontmatter.path,
component: pageTemplate,
context: {
type: getType(node),
next: isNextSameType ? next : null,
previous: isPreviousSameType ? previous : null,
},
})
}, markdownPages)
// Create tag pages
const generateTagPages = data => {
const tags = filter(
tag => not(isNil(tag)),
uniq(flatMap(d => d.frontmatter.tags, data)),
)
forEach(tag => {
const itemsWithTag = data.filter(
d =>
d.frontmatter.tags && d.frontmatter.tags.indexOf(d) !== -1,
);
paginate({
createPage,
items: itemsWithTag,
component: tagsTemplate,
itemsPerPage: siteMetadata.postsPerPage,
pathPrefix: `/tag/${toKebabCase(tag)}`,
context: {
tag,
},
})
}, tags)
};
generateTagPages(posts);
// generateTagPages(projects);
return {
sortedPages: markdownPages,
}
})
}
exports.sourceNodes = ({ actions }) => {
const { createTypes } = actions
const typeDefs = `
type MarkdownRemark implements Node {
frontmatter: Frontmatter!
}
type Frontmatter {
title: String!
date: Date!
path: String!
tags: [String!]
excerpt: String
coverImage: File
}
`
createTypes(typeDefs)
}