040code.github.io/gatsby-node.js at source · 040code/040code.github.io · GitHub

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const{resolve}=require('path');
const{ createFilePath }=require('gatsby-source-filesystem')
constconfig=require('./data/siteConfig');

exports.createPages=async({ graphql, actions })=>{
const{ createPage }=actions

constBlogPostTemplate=resolve('./src/templates/blog-post.js')
constBlogPostShareImage=resolve('./src/templates/blog-post-share-image.js')
constPageTemplate=resolve('./src/templates/page.js')
constPostsBytagTemplate=resolve('./src/templates/tags.js')
constPostsByAuthorTemplate=resolve('./src/templates/authors.js')
constListPostsTemplate=resolve('./src/templates/blog-list-template.js')

constallMarkdown=awaitgraphql(
`
 {
 allMarkdownRemark(
 sort: { fields: [frontmatter___date], order: DESC },
 limit: 1000
 ) {
 edges {
 node {
 frontmatter {
 title
 slug
 type
 tags
 authors
 }
 }
 }
 }
 }
 `
)

if(allMarkdown.errors){
console.error(allMarkdown.errors)
throwError(allMarkdown.errors)
}

constmarkdownFiles=allMarkdown.data.allMarkdownRemark.edges

constposts=markdownFiles
.filter(item=>item.node.frontmatter.type=='post')

// generate paginated post list
constpostsPerPage=config.postsPerPage;
constnbPages=Math.ceil(posts.length/postsPerPage)

Array.from({length: nbPages}).forEach((_,i)=>{
createPage({
path: i===0 ? `/` : `/pages/${i+1}`,
component: ListPostsTemplate,
context: {
limit: postsPerPage,
skip: i*postsPerPage,
currentPage: i+1,
nbPages: nbPages,
},
})
})

// generate blog posts
posts
.forEach((post,index,posts)=>{
constprevious=index===posts.length-1 ? null : posts[index+1].node;
constnext=index===0 ? null : posts[index-1].node;

createPage({
path: post.node.frontmatter.slug,
component: BlogPostTemplate,
context: {
slug: post.node.frontmatter.slug,
 previous,
 next,
},
})

// generate post share images (dev only)
if(process.env.gatsby_executing_command.includes('develop')){
createPage({
path: `${post.node.frontmatter.slug}/image_tw`,
component: BlogPostShareImage,
context: {
slug: post.node.frontmatter.slug,
width: 440,
height: 220,
type: 'twitter',
}
})
createPage({
path: `${post.node.frontmatter.slug}/image_fb`,
component: BlogPostShareImage,
context: {
slug: post.node.frontmatter.slug,
width: 1200,
height: 630,
type: 'facebook',
}
})
}

})

// generate pages
markdownFiles
.filter(item=>item.node.frontmatter.type==='page')
.forEach(page=>{
createPage({
path: page.node.frontmatter.slug,
component: PageTemplate,
context: {
slug: page.node.frontmatter.slug,
},
})
})

// generate tags
markdownFiles
.filter(item=>item.node.frontmatter.tags!==null)
.reduce((acc,cur)=>[...newSet([...acc, ...cur.node.frontmatter.tags])],[])
.forEach(uniqTag=>{
createPage({
path: `tags/${uniqTag}`,
component: PostsBytagTemplate,
context: {
tag: uniqTag
},
})
})

// generate authors
markdownFiles
.filter(item=>item.node.frontmatter.authors!==null)
.reduce((acc,cur)=>[...newSet([...acc, ...cur.node.frontmatter.authors])],[])
.forEach(uniqAuthor=>{
createPage({
path: `authors/${uniqAuthor}`,
component: PostsByAuthorTemplate,
context: {
author: uniqAuthor
},
})
})
}

exports.onCreateNode=({ node, actions, getNode })=>{
const{ createNodeField }=actions

if(node.internal.type===`MarkdownRemark`){
constvalue=createFilePath({ node, getNode })
createNodeField({
name: `slug`,
 node,
 value,
})
}
}