72 lines
1.9 KiB
TypeScript
72 lines
1.9 KiB
TypeScript
import * as Gemtext from "gemtext";
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export function renderGemtextToHtml(gemtext: string, title?: string): string {
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gemtext = title ? gemtext.replace(`# ${title}`, "") : gemtext;
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return postProcessGemtextToHtml(
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Gemtext.parse(gemtext).generate(GemtextHTMLRenderer),
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);
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}
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const GemtextHTMLRenderer: Gemtext.Renderer<string> = {
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preamble: function (): string {
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return "";
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},
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postamble: function (): string {
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return "";
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},
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text: function (content: string): string {
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content = content.trim();
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if (content === "") {
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return "";
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}
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return `<p>${htmlEscape(content)}</p>`;
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},
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link: function (url: string, alt: string): string {
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const imgExtensions: (string | undefined)[] = [
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"webp",
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"png",
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"svg",
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"gif",
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"jpg",
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"jpeg",
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"apng",
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];
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if (imgExtensions.includes(url.split(".").at(-1)?.toLowerCase())) {
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return `<img src="${url}" alt="${alt}" />`;
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}
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return `<p>=> <a href="${url}">${alt}</a></p>`;
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},
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preformatted: function (content: string[], alt: string): string {
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return `<pre alt="${alt}">${htmlEscape(content.join("\n"))}</pre>`;
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},
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heading: function (level: number, text: string): string {
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return `<h${level}>${htmlEscape(text)}</h${level}>`;
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},
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unorderedList: function (content: string[]): string {
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return `<ul>${content.map((li) => `<li>${htmlEscape(li)}</li>`).join("")}</ul>`;
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},
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quote: function (content: string): string {
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return `<blockquote>${htmlEscape(content)}</blockquote>`;
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},
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};
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function htmlEscape(str: string) {
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return str.replace(/&/g, "&").replace(/</g, "<").replace(/>/g, ">");
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}
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function postProcessGemtextToHtml(html: string): string {
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html = mergeAdjacentBlockquotes(html);
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return html;
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}
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function mergeAdjacentBlockquotes(html: string): string {
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return html.replaceAll(/\<\/blockquote\>\<blockquote\>/gm, "<br>");
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}
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