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on-node-create.js
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on-node-create.js
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const grayMatter = require(`gray-matter`)
const crypto = require(`crypto`)
module.exports = async function onNodeCreate({
node,
getNode,
loadNodeContent,
boundActionCreators,
}) {
const { createNode, addNodeToParent } = boundActionCreators
// Don't reprocess our own nodes! (note: this doesn't normally happen
// but since this transformer creates new nodes with the same media-type
// as its parent node, we have to add this check that we didn't create
// the node).
if (node.internal.type === `MarkdownRemark`) {
return
}
// We only care about markdown content.
if (node.internal.mediaType !== `text/x-markdown`) {
return
}
const content = await loadNodeContent(node)
const data = grayMatter(content)
const contentDigest = crypto
.createHash(`md5`)
.update(JSON.stringify(data))
.digest(`hex`)
const markdownNode = {
id: `${node.id} >>> MarkdownRemark`,
children: [],
parent: node.id,
internal: {
contentDigest,
type: `MarkdownRemark`,
mediaType: `text/x-markdown`,
content: data.content,
},
}
markdownNode.frontmatter = {
title: ``, // always include a title
...data.data,
parent: node.id,
}
// Add path to the markdown file path
if (node.internal.type === `File`) {
markdownNode.fileAbsolutePath = node.absolutePath
}
createNode(markdownNode)
addNodeToParent({ parent: node, child: markdownNode })
}