New RSS component

examples/official-site/sqlpage/migrations/37_rss.sql

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+-- Documentation for the RSS component
+INSERT INTO component (name, description, icon, introduced_in_version) VALUES (
+    'rss',
+    'Produces a data flow in the RSS format. To use this component, you must first returning an HTTP header with the "application/rss+xml" content type (see http_header component). Next, you must use the shell-empty component to avoid that SQLPage generates HTML code. TIPS: If you don''t want change the page shell, you can also use the _sqlpage_embed URL parameter.',
+    'rss',
+    '0.20.0'
+);
+
+INSERT INTO parameter (component,name,description,type,top_level,optional) VALUES (
+    'rss',
+    'title',
+    'Defines the title of the channel.',
+    'TEXT',
+    TRUE,
+    FALSE
+),(
+    'rss',
+    'link',
+    'Defines the hyperlink to the channel.',
+    'URL',
+    TRUE,
+    FALSE
+),(
+    'rss',
+    'description',
+    'Describes the channel.',
+    'TEXT',
+    TRUE,
+    FALSE  
+),(
+    'rss',
+    'title',
+    'Defines the title of the item.',
+    'TEXT',
+    FALSE,
+    FALSE  
+),(
+    'rss',
+    'link',
+    'Defines the hyperlink to the item',
+    'URL',
+    FALSE,
+    FALSE 
+),(
+    'rss',
+    'description',
+    'Describes the item',
+    'TEXT',
+    FALSE,
+    FALSE 
+),(
+    'rss',
+    'pubdate',
+    'Indicates when the item was published (RFC-822 date-time).',
+    'TEXT',
+    FALSE,
+    TRUE 
+);
+
+-- Insert example(s) for the component
+INSERT INTO example (component, description)
+VALUES (
+        'rss',
+        '
+### An RSS chanel about SQLPage latest news.
+
+```sql
+select
+	''rss'' as component,
+	''SQLPage blog'' as title,
+	''https://sql.ophir.dev/blog.sql'' as link,
+	''latest news about SQLpage'' as description;
+select
+	''Hello everyone !'' as title,
+	''https://sql.ophir.dev/blog.sql?post=Come%20see%20me%20build%20twitter%20live%20on%20stage%20in%20Prague'' as link,
+	''If some of you european SQLPagers are around Prague this december, I will be giving a talk about SQLPage at pgconf.eu on December 14th.'' as description;
+select
+	''3 solutions to the 3 layer problem'' as title,
+	''https://sql.ophir.dev/blog.sql?post=3%20solutions%20to%20the%203%20layer%20problem'' as link,
+	''Some interesting questions emerged from the article Repeating yourself.'' as description,
+	''Mon, 04 Dec 2023 00:00:00 GMT'' as pubdate;
+```
+');

sqlpage/templates/rss.handlebars

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+<?xml version="1.0" encoding="utf-8"?>
+<rss version="2.0">
+	<channel>
+		<title>{{title}}</title>
+		<link>{{link}}</link>
+		<description>{{description}}</description>
+		{{#each_row}}
+		<item>
+			<title>{{title}}</title>
+			<link>{{link}}</link>
+			<description><![CDATA[{{description}}]]></description>
+			{{~#if pubdate}}<pubDate>{{pubdate}}</pubDate>{{/if}}
+		</item>
+		{{/each_row}}
+	</channel>
+</rss>
+