Brandon Lucas
cbb66fbb73
Sync local packages into the registry repo and update index.json and README.md to include all 9 packages.
102 lines
3.7 KiB
Plaintext
102 lines
3.7 KiB
Plaintext
// rss - RSS 2.0 feed generator for Lux
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//
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// Generates valid RSS 2.0 XML feeds from structured data.
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import xml
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// An RSS feed item
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type Item =
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| Item(String, String, String, String, String)
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// Item(title, link, description, pubDate, guid)
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// An RSS channel/feed
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type Feed =
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| Feed(String, String, String, String, List<Item>)
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// Feed(title, link, description, language, items)
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// Create a feed item
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pub fn item(title: String, link: String, description: String, pubDate: String): Item =
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Item(title, link, description, pubDate, link)
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// Create a feed item with custom GUID
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pub fn itemWithGuid(title: String, link: String, description: String, pubDate: String, guid: String): Item =
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Item(title, link, description, pubDate, guid)
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// Create an RSS feed
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pub fn feed(title: String, link: String, description: String, items: List<Item>): Feed =
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Feed(title, link, description, "en", items)
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// Create an RSS feed with language
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pub fn feedWithLang(title: String, link: String, description: String, language: String, items: List<Item>): Feed =
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Feed(title, link, description, language, items)
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// Access item fields
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pub fn itemTitle(i: Item): String = match i { Item(t, _, _, _, _) => t, }
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pub fn itemLink(i: Item): String = match i { Item(_, l, _, _, _) => l, }
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pub fn itemDescription(i: Item): String = match i { Item(_, _, d, _, _) => d, }
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pub fn itemPubDate(i: Item): String = match i { Item(_, _, _, p, _) => p, }
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pub fn itemGuid(i: Item): String = match i { Item(_, _, _, _, g) => g, }
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// Convert ISO date (2025-01-29) to RFC 822 format (29 Jan 2025 00:00:00 GMT)
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pub fn isoToRfc822(isoDate: String): String =
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if String.length(isoDate) < 10 then isoDate
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else {
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let year = String.substring(isoDate, 0, 4)
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let month = String.substring(isoDate, 5, 7)
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let day = String.substring(isoDate, 8, 10)
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let monthName = if month == "01" then "Jan"
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else if month == "02" then "Feb"
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else if month == "03" then "Mar"
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else if month == "04" then "Apr"
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else if month == "05" then "May"
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else if month == "06" then "Jun"
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else if month == "07" then "Jul"
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else if month == "08" then "Aug"
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else if month == "09" then "Sep"
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else if month == "10" then "Oct"
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else if month == "11" then "Nov"
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else "Dec"
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day + " " + monthName + " " + year + " 00:00:00 GMT"
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}
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// Render a single item to XML string
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fn renderItemXml(i: Item): String =
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match i {
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Item(title, link, desc, pubDate, guid) =>
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xml.render(xml.el("item", [
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xml.textEl("title", title),
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xml.textEl("link", link),
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xml.textEl("description", desc),
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xml.textEl("pubDate", isoToRfc822(pubDate)),
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xml.textElAttr("guid", [xml.attr("isPermaLink", "true")], guid)
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])),
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}
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// Render items to concatenated XML string
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fn renderItemsXml(items: List<Item>): String =
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match List.head(items) {
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None => "",
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Some(i) => renderItemXml(i) + match List.tail(items) {
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Some(rest) => renderItemsXml(rest),
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None => "",
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},
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}
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// Render an RSS feed to XML string
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pub fn render(f: Feed): String =
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match f {
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Feed(title, link, desc, lang, items) => {
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let itemsXml = renderItemsXml(items)
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"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
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"<rss version=\"2.0\" xmlns:atom=\"http://www.w3.org/2005/Atom\">" +
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"<channel>" +
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"<title>" + xml.escape(title) + "</title>" +
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"<link>" + xml.escape(link) + "</link>" +
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"<description>" + xml.escape(desc) + "</description>" +
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"<language>" + lang + "</language>" +
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"<generator>Lux RSS Package</generator>" +
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itemsXml +
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"</channel></rss>"
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},
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}
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