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

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const path = require("path")
const _ = require("lodash")

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

  const notFoundTemplate = path.resolve("./src/templates/404.tsx")
  createPage({
    path: "404.html",
    component: notFoundTemplate
  })

  const pageTemplate = path.resolve("./src/templates/page.tsx")
  const pageResult = await graphql(
    `
      {
        allMdx(
          filter: { frontmatter: {layout: {eq: "page"}}}
        ) {
          edges {
            node {
              fields {
                path
              }
              frontmatter {
                title
                layout
              }
            }
          }
        }
      }
    `
  )

  if (pageResult.errors) {
    throw pageResult.errors
  }

  // Create pages.
  const pages = pageResult.data.allMdx.edges

  pages.forEach((page) => {
    createPage({
      path: page.node.fields.path,
      component: pageTemplate,
      context: {
      },
    })
  })

  const postTemplate = path.resolve("./src/templates/post.tsx")
  const result = await graphql(
    `
      {
        allMdx(
          sort: { fields: [frontmatter___date], order: DESC }
          filter: { frontmatter: {layout: {eq: "post"}}}
        ) {
          edges {
            node {
              fields {
                path
              }
              frontmatter {
                title
                date
                layout
              }
            }
          }
        }
      }
    `
  )

  if (result.errors) {
    throw result.errors
  }

  // Create blog posts pages.
  const posts = result.data.allMdx.edges

  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.path,
      component: postTemplate,
      context: {
        previous,
        next,
      },
    })

    // Redirect for AMP pages from old site
    createRedirect({
      fromPath: `${post.node.fields.path}amp/`,
      toPath: post.node.fields.path,
      isPermanent: true
    })
  })

  const chunkTemplate = path.resolve("./src/templates/chunk.tsx")
  const postsPerPage = 5
  const numPages = Math.ceil(posts.length / postsPerPage)
  Array.from({ length: numPages }).forEach((_, i) => {
    const currentPage = (i + 1)
    createPage({
      path: `/posts/${currentPage}`,
      component: chunkTemplate,
      context: {
        limit: postsPerPage,
        skip: i * postsPerPage,
        numPages,
        currentPage,
        previousPage: currentPage > 1 ? currentPage - 1 : null,
        nextPage: currentPage >= numPages ? null : currentPage + 1
      },
    })
  })

  const archivesTemplate = path.resolve("./src/templates/archives.tsx")
  createPage({
    path: "/blog/archives/",
    component: archivesTemplate,
  })

  const categoriesTemplate = path.resolve("./src/templates/categories.tsx")
  createPage({
    path: "/blog/categories/",
    component: categoriesTemplate,
  })

  const categoryTemplate = path.resolve("./src/templates/category.tsx")

  const categoryResult = await graphql(`
    {
      categoriesGroup: allMdx {
        group(field: frontmatter___categories) {
          fieldValue
        }
      }
    }
  `)

  if (categoryResult.errors) {
    throw categoryResult.errors
  }
  const categories = categoryResult.data.categoriesGroup.group
  categories.forEach(category => {
    createPage({
      path: `/blog/categories/${_.kebabCase(category.fieldValue)}/`,
      component: categoryTemplate,
      context: {
        category: category.fieldValue
      }
    })
  })
}

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

  if (node.internal.type === "Mdx") {

    if (node.frontmatter.layout === "post") {
      const url = node.fileAbsolutePath.replace(/.+\/(\d+)-(\d+)-(\d+)-([\S]+)\.mdx?$/, "/blog/$1/$2/$3/$4/")
      createNodeField({
        name: "path",
        node,
        value: url
      })
    }
    if (node.frontmatter.layout === "page") {
      createNodeField({
        name: "path",
        node,
        value: node.fileAbsolutePath.replace(/.+\/([\w*-]+)\.mdx?$/, "/$1/")
      })
    }
  }
}