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gatsby-node.js
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gatsby-node.js
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const path = require(`path`);
const get = require("lodash/get");
const kebabCase = require("lodash/kebabCase");
const uniq = require("lodash/uniq");
const { createFilePath } = require(`gatsby-source-filesystem`);
exports.onCreateNode = ({ node, getNode, actions }) => {
const { createNodeField } = actions;
if (node.internal.type === `Mdx`) {
const slug = createFilePath({ node, getNode });
createNodeField({
node,
name: `slug`,
value: slug
});
createNodeField({
node,
name: "isPublic",
value: "isPublic" in node.frontmatter ? node.frontmatter.isPublic : true
});
}
};
const getTags = posts => {
const tags = posts.reduce((ac, edge) => {
return get(edge, "node.frontmatter.tags")
? ac.concat(edge.node.frontmatter.tags)
: ac;
}, []);
return uniq(tags);
};
const orderBy = require("lodash/orderBy");
const levenshtein = require("js-levenshtein");
const index = ({ frontmatter }) =>
frontmatter.title + " " + (frontmatter.tags.join()).repeat(3);
const getSimilar = (posts, post, limit = 3) =>
orderBy(
posts
.filter(({ node }) => node.id !== post.id) // except the same
.map(({ node }) => ({
...node,
cost: levenshtein(index(node), index(post))
})),
["cost"],
["asc"]
).slice(0, limit);
exports.createPages = async ({ graphql, actions, reporter }) => {
const { createPage } = actions;
const result = await graphql(
`
{
allMdx {
edges {
node {
id
parent {
... on File {
name
sourceInstanceName
relativePath
}
}
frontmatter {
tags
title
description
}
fields {
slug
}
excerpt
}
}
}
}
`
);
if (result.errors) {
reporter.panicOnBuild('🚨 ERROR: Loading "createPages" query');
}
// Create blog posts pages.
const posts = result.data.allMdx.edges;
posts.forEach(({ node }) => {
createPage({
path: `/${node.parent.sourceInstanceName}/${node.parent.name}`,
component: path.resolve("./src/components/posts/template.js"),
context: {
id: node.id,
workspacePath: `src/${node.parent.sourceInstanceName}/${node.parent.relativePath}`,
recommendedContent: getSimilar(posts, node)
}
});
});
const tags = getTags(posts);
tags.forEach(tag => {
createPage({
path: `/tags/${kebabCase(tag)}/`,
component: path.resolve("./src/components/tags/template.js"),
context: {
tag
}
});
});
};
exports.onCreateWebpackConfig = ({ actions }) => {
actions.setWebpackConfig({
resolve: {
modules: [path.resolve(__dirname, "src"), "node_modules"],
alias: { $components: path.resolve(__dirname, "src/components") }
}
});
};