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gatsby-node.js
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gatsby-node.js
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/* eslint-disable @typescript-eslint/no-var-requires */
/**
* Implement Gatsby's Node APIs in this file.
*
* See: https://www.gatsbyjs.org/docs/node-apis/
*/
const path = require('path')
const { kebabCase } = require('lodash')
function groupCountBy(field, edges) {
const groupCounts = edges.reduce((acc, { node }) => {
const groups = node.frontmatter[field] || []
groups.forEach(group => {
acc[group] = (acc[group] || 0) + 1
})
return acc
}, {})
return Object.entries(groupCounts)
}
exports.createPages = async ({ actions, graphql, reporter }) => {
const { createPage } = actions
function createContentListPages({ itemTotal, prefix, component, context, limit = 10 }) {
const pageTotal = Math.ceil(itemTotal / limit)
for (let page = 1; page <= pageTotal; page++) {
const path = page > 1 ? `${prefix}/${page}` : `${prefix}`
const skip = (page - 1) * limit
createPage({
path,
component,
context: {
...context,
itemTotal,
limit,
page,
pageTotal,
prefix,
skip
}
})
}
}
const IndexTemplate = path.resolve('src/templates/IndexTemplate.tsx')
const TagTemplate = path.resolve('src/templates/TagTemplate.tsx')
const SingleTemplate = path.resolve('src/templates/SingleTemplate.tsx')
const { data, errors } = await graphql(`
{
allMdx(filter: { frontmatter: { draft: { ne: true } } }) {
edges {
node {
parent {
... on File {
name
sourceInstanceName
}
}
frontmatter {
path
tags
}
}
}
}
}
`)
if (errors) {
reporter.panicOnBuild('Error fetching data', errors)
return
}
const edges = data.allMdx.edges
edges.forEach(({ node }) => {
const { frontmatter, parent } = node
const path = frontmatter.path || `/${parent.sourceInstanceName}/${parent.name}`
createPage({
path,
component: SingleTemplate
})
})
reporter.info(`Articles (${edges.length})`)
createContentListPages({
itemTotal: edges.length,
prefix: '/all',
component: IndexTemplate
})
reporter.info(`Index (${Math.ceil(edges.length / 10)})`)
groupCountBy('tags', edges).forEach(([tag, itemTotal]) => {
createContentListPages({
itemTotal,
prefix: `/tags/${kebabCase(tag)}`,
component: TagTemplate,
context: { tag }
})
reporter.info(`Tag: ${tag} (${Math.ceil(itemTotal / 10)})`)
})
}