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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,152 @@ | ||
| const path = require('path'); | ||
| const makeSlug = require('lodash.kebabcase'); | ||
| const { createFilePath } = require('gatsby-source-filesystem'); | ||
|
|
||
| // Map of path matchers to templates. This is used to determine which template | ||
| // to use when rendering a page, favouring convention (by file path) over | ||
| // configuration. | ||
| const pathMatchers = [ | ||
| { | ||
| matcher: /\/content\/blog-posts\//, | ||
| template: 'blog-post', | ||
| }, | ||
| ]; | ||
|
|
||
| // Gatsby hook for creating pages at build time. This is invoked after the | ||
| // GraphQL schema has been inferred so we can query the data in order to create | ||
| // pages from it. We query for all Markdown "page" nodes and create pages from | ||
| // them. By convention we expect all Markdown nodes within the "pages" directory | ||
| // to represent pages and all others to respresent content that will be pulled | ||
| // into other pages. We can therefore filter all the Markdown nodes by file | ||
| // path. | ||
| exports.createPages = ({ | ||
| boundActionCreators: { createPage }, | ||
| graphql, | ||
| }) => graphql(` | ||
| { | ||
| site { | ||
| config: siteMetadata { | ||
| blogBasePath | ||
| } | ||
| } | ||
| markdown: allMarkdownRemark( | ||
| filter: { | ||
| fileAbsolutePath: { | ||
| regex: "/\\/(pages|content)\\//", | ||
| } | ||
| } | ||
| ) { | ||
| edges { | ||
| node { | ||
| fileAbsolutePath | ||
| fields { | ||
| slug | ||
| } | ||
| frontmatter { | ||
| categories | ||
| tags | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| `) | ||
| .then((result) => { // eslint-disable-line consistent-return | ||
| if (result.errors) { | ||
| return Promise.reject(result.errors); | ||
| } | ||
|
|
||
| const categories = new Set(); | ||
| const tags = new Set(); | ||
|
|
||
| result.data.markdown.edges.forEach(({ node }) => { | ||
| // Determine the template to use with the page. If we can't find a | ||
| // template we skip the file. | ||
| const match = pathMatchers.find(({ matcher }) => | ||
| matcher.test(node.fileAbsolutePath)); | ||
|
|
||
| if (!match) { | ||
| return; | ||
| } | ||
|
|
||
| const { template } = match; | ||
|
|
||
| // Add the categories of this post to the set of unique categories. The | ||
| // set is used to produce a page for each category. | ||
| if (template === 'blog-post') { | ||
| node.frontmatter.categories.forEach(cat => categories.add(cat)); | ||
| node.frontmatter.tags.forEach(tag => tags.add(tag)); | ||
| } | ||
|
|
||
| // Create a page at the given path. The context is used to provide | ||
| // variable data to the GraphQL query used by the page. | ||
| const pagePath = node.fields.slug; | ||
| const context = {}; | ||
|
|
||
| if (node.fields && node.fields.slug) { | ||
| context.slug = node.fields.slug; | ||
| } | ||
|
|
||
| createPage({ | ||
| path: pagePath, | ||
| component: path.resolve(`src/templates/${template}/index.js`), | ||
| context, | ||
| }); | ||
| }); | ||
|
|
||
| // Create category and tag pages containing all of the blog posts belonging | ||
| // to the given category or tag. | ||
| const { blogBasePath } = result.data.site.config; | ||
|
|
||
| categories.forEach(category => createPage({ | ||
| path: `${blogBasePath}/categories/${makeSlug(category)}`, | ||
| component: path.resolve('src/templates/blog-category/index.js'), | ||
| context: { | ||
| category, | ||
| }, | ||
| })); | ||
|
|
||
| tags.forEach(tag => createPage({ | ||
| path: `${blogBasePath}/tags/${makeSlug(tag)}`, | ||
| component: path.resolve('src/templates/blog-tag/index.js'), | ||
| context: { | ||
| tag, | ||
| }, | ||
| })); | ||
| }); | ||
|
|
||
| // Handle "createNode" events from Gatsby at build time. This runs for every | ||
| // node (basically everything in Gatsby is a "node") and allows us to add or | ||
| // modify data associated with a node dynamically. Any changes to nodes made | ||
| // here make it through to the GraphQL schema and can there be queried. | ||
| exports.onCreateNode = ({ node, boundActionCreators, getNode }) => { | ||
| const { createNodeField } = boundActionCreators; | ||
|
|
||
| // If the node is a blog post we create a slug for it from its file path. The | ||
| // file path here is actually just the file name, so the slug for | ||
| // "src/content/blog-posts/my-first-post.md" is "my-first-post". | ||
| if (/\/content\/blog-posts\//.test(node.fileAbsolutePath)) { | ||
| const value = `/blog${createFilePath({ | ||
| basePath: 'blog-posts', | ||
| getNode, | ||
| node, | ||
| })}`; | ||
|
|
||
| createNodeField({ | ||
| name: 'slug', | ||
| node, | ||
| value, | ||
| }); | ||
| } | ||
|
|
||
| // If the node is an author metadata document we create a uniquely named field | ||
| // front the author name to allow mapping to blog post frontmatter. This | ||
| // approach allows us to use more semantically named keys in frontmatter. | ||
| if (/\/content\/authors\//.test(node.fileAbsolutePath)) { | ||
| createNodeField({ | ||
| name: 'authorName', | ||
| value: node.frontmatter.name, | ||
| node, | ||
| }); | ||
| } | ||
| }; |
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