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gatsby-node.js
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gatsby-node.js
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/* eslint "no-console": "off" */
const path = require('path');
const _ = require('lodash');
const moment = require('moment');
const siteConfig = require('./data/SiteConfig');
exports.onCreateNode = ({ node, actions, getNode }) => {
const { createNodeField } = actions;
let slug;
if (node.internal.type === 'MarkdownRemark') {
const fileNode = getNode(node.parent);
const parsedFilePath = path.parse(fileNode.relativePath);
if (
Object.prototype.hasOwnProperty.call(node, 'frontmatter') &&
Object.prototype.hasOwnProperty.call(node.frontmatter, 'title')
) {
slug = `/${_.kebabCase(node.frontmatter.title)}`;
} else if (parsedFilePath.name !== 'index' && parsedFilePath.dir !== '') {
slug = `/${parsedFilePath.dir}/${parsedFilePath.name}/`;
} else if (parsedFilePath.dir === '') {
slug = `/${parsedFilePath.name}/`;
} else {
slug = `/${parsedFilePath.dir}/`;
}
if (Object.prototype.hasOwnProperty.call(node, 'frontmatter')) {
if (Object.prototype.hasOwnProperty.call(node.frontmatter, 'slug'))
slug = `/${_.kebabCase(node.frontmatter.slug)}`;
if (Object.prototype.hasOwnProperty.call(node.frontmatter, 'date')) {
const date = moment(node.frontmatter.date, siteConfig.dateFromFormat);
if (!date.isValid)
console.warn(`WARNING: Invalid date.`, node.frontmatter);
createNodeField({ node, name: 'date', value: date.toISOString() });
}
}
createNodeField({ node, name: 'slug', value: slug });
}
};
exports.createPages = async ({ graphql, actions }) => {
const { createPage } = actions;
const postPage = path.resolve('src/templates/post.js');
// const categoryPage = path.resolve('src/templates/category.js');
// Get a full list of markdown posts
const markdownQueryResult = await graphql(`
{
allMarkdownRemark {
edges {
node {
fields {
slug
}
frontmatter {
title
tags
category
date
}
}
}
}
}
`);
if (markdownQueryResult.errors) {
console.error(markdownQueryResult.errors);
throw markdownQueryResult.errors;
}
const tagSet = new Set();
const categorySet = new Set();
const postsEdges = markdownQueryResult.data.allMarkdownRemark.edges;
// Sort posts from most recent to oldest
postsEdges.sort((postA, postB) => {
const dateA = moment(
postA.node.frontmatter.date,
siteConfig.dateFromFormat,
);
const dateB = moment(
postB.node.frontmatter.date,
siteConfig.dateFromFormat,
);
if (dateA.isBefore(dateB)) return 1;
if (dateB.isBefore(dateA)) return -1;
return 0;
});
// Post page creating
postsEdges.forEach((edge, index) => {
// Generate a list of tags
if (edge.node.frontmatter.tags) {
edge.node.frontmatter.tags.forEach((tag) => {
tagSet.add(tag);
});
}
// Generate a list of categories
if (edge.node.frontmatter.category) {
categorySet.add(edge.node.frontmatter.category);
}
// Create post pages
const prevID = index + 1 < postsEdges.length ? index + 1 : null;
const nextID = index - 1 >= 0 ? index - 1 : null;
const nextEdge = postsEdges[nextID];
const prevEdge = postsEdges[prevID];
createPage({
path: `/blog${edge.node.fields.slug}`,
component: postPage,
context: {
slug: edge.node.fields.slug,
nextTitle:
nextEdge !== undefined ? nextEdge.node.frontmatter.title : null,
nextSlug: nextEdge !== undefined ? nextEdge.node.fields.slug : null,
prevTitle:
prevEdge !== undefined ? prevEdge.node.frontmatter.title : null,
prevSlug: prevEdge !== undefined ? prevEdge.node.fields.slug : null,
},
});
});
// Create category pages - maybe in the future
// categorySet.forEach((category) => {
// createPage({
// path: `/categories/${_.kebabCase(category)}/`,
// component: categoryPage,
// context: { category },
// });
// });
};