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gatsby-node.js
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gatsby-node.js
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const _ = require('lodash');
const path = require('path');
const Promise = require('bluebird');
const { createFilePath } = require(`gatsby-source-filesystem`);
const SLUG_SEPARATOR = '___';
exports.onCreateWebpackConfig = ({ actions }) => {
actions.setWebpackConfig({
resolve: {
modules: [path.resolve(__dirname, 'src'), 'node_modules'],
},
});
};
exports.onCreateNode = ({ node, getNode, actions }) => {
const { createNodeField } = actions;
if (node.internal.type === `Mdx`) {
const fileNode = getNode(node.parent);
const filePath = createFilePath({ node, getNode });
const source = fileNode.sourceInstanceName;
const separatorExists = ~filePath.indexOf(SLUG_SEPARATOR);
let slug;
let prefix;
if (separatorExists) {
const separatorPosition = filePath.indexOf(SLUG_SEPARATOR);
const slugBeginning = separatorPosition + SLUG_SEPARATOR.length;
slug =
separatorPosition === 1
? null
: `/${filePath.substring(slugBeginning)}`;
// file path example: /2019/2019-09-09___how-to-easily-write-and-debug-rxjs-marble-tests/
prefix = filePath.substring(1, separatorPosition).split('/')[1];
// prefix is 2019-09-09 in our example
} else {
slug = filePath;
prefix = '';
}
if (source !== 'parts') {
createNodeField({
node,
name: `slug`,
value: slug,
});
}
createNodeField({
node,
name: `prefix`,
value: prefix,
});
createNodeField({
node,
name: `source`,
value: source,
});
}
};
exports.createPages = ({ graphql, actions }) => {
const { createPage } = actions;
return new Promise((resolve, reject) => {
const postTemplate = path.resolve('./src/templates/PostTemplate.js');
const pageTemplate = path.resolve('./src/templates/PageTemplate.js');
const tipTemplate = path.resolve('./src/templates/TipTemplate.js');
const categoryTemplate = path.resolve(
'./src/templates/CategoryTemplate.js'
);
resolve(
graphql(`
{
allMdx(
filter: { fields: { slug: { ne: null } } }
sort: { fields: [fields___prefix], order: DESC }
limit: 1000
) {
edges {
node {
fileAbsolutePath
fields {
slug
prefix
source
}
frontmatter {
title
categories
}
}
}
}
}
`).then(result => {
if (result.errors) {
console.log(result.errors);
reject(result.errors);
}
const items = result.data.allMdx.edges;
const categorySet = new Set();
// Create category list
items.forEach(edge => {
const {
node: {
frontmatter: { categories },
},
} = edge;
if (categories) {
categories.forEach(category => {
categorySet.add(category);
});
}
});
// Create category pages
const categoryList = Array.from(categorySet);
categoryList.forEach(category => {
createPage({
path: `/blog/categories/${_.kebabCase(category)}/`,
component: categoryTemplate,
context: {
category,
},
});
});
console.log('👷 Created category pages');
// Create posts
const posts = items.filter(item => item.node.fields.source === 'posts');
posts.forEach(({ node }, index) => {
const slug = node.fields.slug;
const next = index === 0 ? undefined : posts[index - 1].node;
const prev =
index === posts.length - 1 ? undefined : posts[index + 1].node;
createPage({
path: `/blog${slug}`,
component: postTemplate,
context: {
slug,
prev,
next,
},
});
});
console.log('👷 Created post pages');
// Create tips
const tips = items.filter(item => item.node.fields.source === 'tips');
tips.forEach(({ node }, index) => {
const slug = node.fields.slug;
const next = index === 0 ? undefined : tips[index - 1].node;
const prev =
index === tips.length - 1 ? undefined : tips[index + 1].node;
createPage({
path: `/tips${slug}`,
component: tipTemplate,
context: {
slug,
prev,
next,
},
});
});
console.log('👷 Created tips pages');
// create pages
const pages = items.filter(item => item.node.fields.source === 'pages');
pages.forEach(({ node }) => {
const slug = node.fields.slug;
const source = node.fields.source;
createPage({
path: slug,
component: pageTemplate,
context: {
slug,
source,
},
});
});
console.log('👷 Created pages');
})
);
});
};