29 lines
1.1 KiB
TypeScript
29 lines
1.1 KiB
TypeScript
/**
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* Flattens the Markdown users write into one line of plain text, where a
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* quote of it can't render markup: the chat's reply previews and the digest
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* email's quotes of a comment or a note.
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*
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* @module
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*/
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/**
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* Returns the Markdown `md` as one line of plain text. Images become their alt
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* text, or `imageLabel` without one, and links their text. It also takes a
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* body cut short, possibly inside a link, as the server cuts a chat message's
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* `replyToBody`: the unfinished link then shows as its text, without half a
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* URL.
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*/
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export function markdownToPlainText(md: string, imageLabel: string): string {
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return md
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// An image or link cut short at the end loses its unfinished target.
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.replace(/!\[([^\]]*)\]\([^)]*$/, (_, alt: string) => alt || imageLabel)
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.replace(/(^|[^!])\[([^\]]*)\]\([^)]*$/, "$1$2")
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.replace(/!\[[^\]]*$/, "")
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.replace(/!\[([^\]]*)\]\([^)]*\)/g, (_, alt: string) => alt || imageLabel)
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.replace(/\[([^\]]*)\]\([^)]*\)/g, "$1")
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.replace(/^\s{0,3}(#{1,6}|>|[-*+]|\d+\.)\s+/gm, "")
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.replace(/```\w*|\*\*|__|~~|[*`]/g, "")
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.replace(/\s+/g, " ")
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.trim();
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}
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