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gatsby-node.js
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gatsby-node.js
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const path = require(`path`)
const { createFilePath } = require(`gatsby-source-filesystem`)
const { execSync } = require('child_process')
exports.createPages = async ({ graphql, actions }) => {
const { createPage } = actions
const result = await graphql(`
{
site {
siteMetadata {
title
description
categories
postParPage
}
}
allMarkdownRemark(sort: { fields: [frontmatter___date], order: DESC }, limit: 1000) {
edges {
node {
excerpt(pruneLength: 400)
fields {
slug
}
frontmatter {
date(formatString: "MM/DD")
title
category
tags
}
}
}
group(field: frontmatter___tags) {
fieldValue
edges {
node {
id
excerpt(pruneLength: 400)
frontmatter {
date(formatString: "MM/DD")
title
category
tags
}
fields {
slug
}
}
}
}
}
}
`)
if (result.errors) {
throw result.errors
}
// Generate index pages
const posts = result.data.allMarkdownRemark.edges
const indexTempalte = path.resolve('./src/templates/index.jsx')
const POST_PAR_PAGE = result.data.site.siteMetadata.postParPage
const numPages = Math.ceil(posts.length / POST_PAR_PAGE)
Array.from({ length: numPages }).forEach((_, i) => {
createPage({
path: i === 0 ? `/` : `/${i + 1}`,
component: indexTempalte,
context: {
limit: POST_PAR_PAGE,
skip: i * POST_PAR_PAGE,
numPages,
currentPage: i + 1,
result: result,
tagsList: result.data.allMarkdownRemark.group,
siteMetadata: result.data.site.siteMetadata,
},
})
})
// Generate blog posts
const blogPostTemplate = path.resolve('./src/templates/blog-post.jsx')
posts.forEach((post, index) => {
const previous = index === posts.length - 1 ? null : posts[index + 1].node
const next = index === 0 ? null : posts[index - 1].node
createPage({
path: post.node.fields.slug,
component: blogPostTemplate,
context: {
slug: post.node.fields.slug,
previous,
next,
},
})
})
// Generate category pages
const categories = result.data.site.siteMetadata.categories
const categoryisPageTemplate = path.resolve('./src/templates/categories-list.jsx')
categories.map((category) => {
createPage({
path: `/category/${category.toLowerCase()}/`,
component: categoryisPageTemplate,
context: {
categoryName: category,
siteTagsList: result.data.allMarkdownRemark.group,
},
})
})
// Generate tag pages
const tags = result.data.allMarkdownRemark.group
const tagsListTemplate = path.resolve('./src/templates/tags-list.jsx')
tags.map((tag) => {
createPage({
path: `/tag/${tag.fieldValue.toLowerCase()}`,
component: tagsListTemplate,
context: {
tagName: tag.fieldValue,
siteMetadata: result.data.site.siteMetadata,
siteTagsList: result.data.allMarkdownRemark.group,
},
})
})
}
exports.onCreateNode = ({ node, actions, getNode }) => {
const { createNodeField } = actions
if (node.internal.type === `MarkdownRemark`) {
const filePath = createFilePath({ node, getNode })
createNodeField({
name: `slug`,
node,
value: filePath,
})
const lastFileUpdatedAt = execSync(`git log -1 --pretty=format:%aI ${node.fileAbsolutePath}`).toString()
createNodeField({
name: 'lastFileUpdatedAt',
node,
value: lastFileUpdatedAt,
})
const fileRevisionCount = execSync(`git rev-list --count HEAD ${node.fileAbsolutePath}`).toString().trim()
createNodeField({
name: 'fileRevisionCount',
node,
value: fileRevisionCount,
})
}
}