feat(frontmatter): configure max length for description (#946)

* Sentence length check

* Replace external links with domain name.

* Updated documentation.

* Updated replacement values.

* Updated Regex based on feedback.

* Check description for undefined

* Updated external url transform regex.

* Updated formatting
This commit is contained in:
Emile Bangma 2024-03-04 18:52:28 +01:00 committed by GitHub
parent bd05950c2d
commit bcb5b2df09
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2 changed files with 36 additions and 8 deletions

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@ -14,6 +14,7 @@ If the frontmatter contains a `description` property, it is used (see [[authorin
This plugin accepts the following configuration options:
- `descriptionLength`: the maximum length of the generated description. Default is 150 characters. The cut off happens after the first _sentence_ that ends after the given length.
- `replaceExternalLinks`: If `true` (default), replace external links with their domain and path in the description (e.g. `https://domain.tld/some_page/another_page?query=hello&target=world` is replaced with `domain.tld/some_page/another_page`).
## API

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@ -5,12 +5,19 @@ import { escapeHTML } from "../../util/escape"
export interface Options {
descriptionLength: number
replaceExternalLinks: boolean
}
const defaultOptions: Options = {
descriptionLength: 150,
replaceExternalLinks: true,
}
const urlRegex = new RegExp(
/(https?:\/\/)?(?<domain>([\da-z\.-]+)\.([a-z\.]{2,6})(:\d+)?)(?<path>[\/\w\.-]*)(\?[\/\w\.=&;-]*)?/,
"g",
)
export const Description: QuartzTransformerPlugin<Partial<Options> | undefined> = (userOpts) => {
const opts = { ...defaultOptions, ...userOpts }
return {
@ -19,19 +26,39 @@ export const Description: QuartzTransformerPlugin<Partial<Options> | undefined>
return [
() => {
return async (tree: HTMLRoot, file) => {
const frontMatterDescription = file.data.frontmatter?.description
const text = escapeHTML(toString(tree))
let frontMatterDescription = file.data.frontmatter?.description
let text = escapeHTML(toString(tree))
if (opts.replaceExternalLinks) {
frontMatterDescription = frontMatterDescription?.replace(
urlRegex,
"$<domain>" + "$<path>",
)
text = text.replace(urlRegex, "$<domain>" + "$<path>")
}
const desc = frontMatterDescription ?? text
const sentences = desc.replace(/\s+/g, " ").split(".")
const sentences = desc.replace(/\s+/g, " ").split(/\.\s/)
let finalDesc = ""
let sentenceIdx = 0
const len = opts.descriptionLength
while (finalDesc.length < len) {
const sentence = sentences[sentenceIdx]
if (!sentence) break
finalDesc += sentence + "."
sentenceIdx++
if (sentences[0] !== undefined && sentences[0].length >= len) {
const firstSentence = sentences[0].split(" ")
while (finalDesc.length < len) {
const sentence = firstSentence[sentenceIdx]
if (!sentence) break
finalDesc += sentence + " "
sentenceIdx++
}
finalDesc = finalDesc.trimEnd() + "..."
} else {
while (finalDesc.length < len) {
const sentence = sentences[sentenceIdx]
if (!sentence) break
finalDesc += sentence.endsWith(".") ? sentence : sentence + "."
sentenceIdx++
}
}
file.data.description = finalDesc