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