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gatsby-node.js
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gatsby-node.js
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const path = require('path');
const _ = require('lodash');
const { createFilePath } = require('gatsby-source-filesystem');
const { paginate } = require('gatsby-awesome-pagination');
exports.onCreateNode = ({ node, actions, getNode }) => {
const { createNodeField } = actions;
if (node.internal.type === `MarkdownRemark`) {
const slug = createFilePath({
node,
getNode,
});
const fileNode = getNode(node.parent);
const source = fileNode.sourceInstanceName;
const separtorIndex = slug.indexOf('--') ? slug.indexOf('--') : 0;
const shortSlugStart = separtorIndex ? separtorIndex + 2 : 0;
if (source !== 'parts') {
createNodeField({
node,
name: `slug`,
value: `${separtorIndex ? '/' : ''}${slug.substring(shortSlugStart)}`,
});
}
createNodeField({
node,
name: `prefix`,
value: separtorIndex ? slug.substring(1, separtorIndex) : '',
});
createNodeField({
node,
name: `source`,
value: source,
});
}
};
exports.createPages = ({ graphql, actions }) => {
const { createPage } = actions;
return new Promise((resolve, reject) => {
const indexTemplate = path.resolve('src/templates/index.tsx');
const postTemplate = path.resolve('src/templates/Post/index.tsx');
const tagTemplate = path.resolve('src/templates/Tag/index.tsx');
resolve(
graphql(
`
{
allMarkdownRemark(
sort: { fields: [frontmatter___date], order: DESC }
limit: 1000
) {
edges {
node {
id
fields {
slug
prefix
source
}
frontmatter {
title
image
tags
slug
}
}
}
}
}
`,
).then(result => {
if (result.errors) {
reject(result.errors);
}
const items = result.data.allMarkdownRemark.edges;
const tagSet = new Set();
items.forEach(edge => {
const {
node: {
frontmatter: { tags },
},
} = edge;
if (tags && tags !== null) {
tags.forEach(tag => tagSet.add(tag));
}
});
const tagList = Array.from(tagSet);
tagList.forEach(tag => {
createPage({
path: `/tag/${_.kebabCase(tag)}/`,
component: tagTemplate,
context: {
tag,
},
});
});
const posts = items.filter(item => item.node.fields.source === 'posts');
posts.forEach(({ node }, index) => {
const { source } = node.fields;
const { slug } = node.frontmatter;
createPage({
path: slug,
component: postTemplate,
context: {
slug,
source,
},
});
});
const itemsPerPage = 5;
paginate({
createPage,
items: posts,
itemsPerFirstPage: itemsPerPage,
itemsPerPage,
pathPrefix: '/',
component: indexTemplate,
});
}),
);
});
};