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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, updateNode } = 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.type === `MarkdownRemark`) {
return
}
// We only care about markdown content.
if (node.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`,
contentDigest,
parent: node.id,
type: `MarkdownRemark`,
mediaType: `text/x-markdown`,
children: [],
content: data.content,
}
markdownNode.frontmatter = {
...data.data,
parent: node.id,
}
// Add path to the markdown file path
if (node.type === `File`) {
markdownNode.fileAbsolutePath = node.absolutePath
}
node.children = node.children.concat([markdownNode.id])
updateNode(node)
createNode(markdownNode)
}