gatsby-node.js

const fs = require('fs')
const path = require('path')
const Remark = require('remark')

const sectionTitles = {
  guide: 'Guide',
  community: 'Community'
}

const langsWithPaths = ['es', 'ru'];

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

  Object.keys(sectionTitles).forEach(section => {
    createPage({
      path: `${section}/search`,
      component: path.resolve('src/templates/Search.js'),
      context: {
        section: section,
        sectionTitle: sectionTitles[section],
        relatedFiles: `/^${section}\\/.*\\.md$/`
      }
    })
  })

  graphql(`{
    allFile(filter:{relativePath:{regex:"/^([a-z]{2}\\\\/)?(guide|community)\\\\/.*\\\\.md$/"}}) {
      edges {
        node {
          relativePath
          childMarkdownRemark {id}
        }
      }
    }
  }`
  )
    .then(({ errors, data }) => {
      if (errors) return Promise.reject(errors)
      if (!data.allFile) {
        throw new Error('No files found')
      }
      data.allFile.edges.forEach(
        ({ node: { relativePath, childMarkdownRemark } }) => {
          if (!childMarkdownRemark) return
          let targetPath = relativePath.slice(0, -'.md'.length)
          if (relativePath.match(/index\.md$/)) {
            targetPath = relativePath.slice(0, -'/index.md'.length)
          }

          const pathSplit = relativePath.split('/')
          const [section, langPath] = langsWithPaths.indexOf(pathSplit[0]) === -1
            ? [pathSplit[0], '']
            : [pathSplit[1], pathSplit[0]]

          createPage({
            path: targetPath,
            component: path.resolve('src/templates/Guide.js'),
            context: {
              section: langPath ? langPath + '/' + section : section,
              sectionTitle: sectionTitles[section],
              relativePath,
              relatedFiles: langPath ? `/^${langPath}\\/${section}\\/.*\\.md$/` : `/^${section}\\/.*\\.md$/`
            }
          })
        }
      )
    })
    .then(() => {
      return graphql(
        `{
      allFile(filter:{relativePath:{regex:"/api.*html$/"}}) {
        edges {
          node {
            relativePath
          }
        }
      }
    }`
      ).then(({ errors, data }) => {
        if (errors) return Promise.reject(errors)
        if (!data.allFile) {
          throw new Error('No files found')
        }
        data.allFile.edges.forEach(({ node: { relativePath } }) => {
          createPage({
            path: relativePath,
            component: path.resolve('src/templates/API.js'),
            context: {
              relativePath
            }
          })
        })
      })
    })
}

exports.onCreateNode = ({ node, boundActionCreators }) => {
  const { createPage } = boundActionCreators

  if (!node.relativePath || !node.childMarkdownRemark) return

  const { relativePath } = node
  if (!relativePath.match(/^(es|guide|community)\//)) return
  let targetPath = relativePath.slice(0, -'.md'.length)
  if (relativePath.match(/index\.md$/)) {
    targetPath = relativePath.slice(0, -'/index.md'.length)
  }
  createPage({
    path: targetPath,
    component: path.resolve('src/templates/Guide.js'),
    context: {
      relativePath
    }
  })
}