chore: import upstream snapshot with attribution

examples/official-site/functions.sql

@@ -0,0 +1,68 @@
+select 'http_header' as component,
+    printf('<%s>; rel="canonical"',
+            iif($function is not null, sqlpage.link('functions', json_object('function', $function)), 'functions.sql')
+    ) as "Link";
+
+select 'dynamic' as component, json_patch(json_extract(properties, '$[0]'), json_object(
+    'title', coalesce($function || ' - ', '') || 'SQLPage Functions Documentation'
+)) as properties
+FROM example WHERE component = 'shell' LIMIT 1;
+
+select 'breadcrumb' as component;
+select 'SQLPage' as title, '/' as link, 'Home page' as description;
+select 'Functions' as title, '/functions.sql' as link, 'List of all functions' as description;
+select $function as title, sqlpage.set_variable('function', $function) as link where $function IS NOT NULL;
+
+select 'text' as component, 'SQLPage built-in functions' as title where $function IS NULL;
+select '
+In addition to normal SQL functions supported by your database,
+SQLPage provides a few special functions to help you extract data from user requests.
+
+These functions are special, because they are not executed inside your database,
+but by SQLPage itself before sending the query to your database.
+Thus, they require all the parameters to be known at the time the query is sent to your database.
+Function parameters cannot reference columns from the rest of your query.
+The only case when you can call a SQLPage function with a parameter that is not a constant is when it appears at the top level of a `SELECT` statement.
+For example, `SELECT sqlpage.url_encode(url) FROM t` is allowed because SQLPage can execute `SELECT url FROM t` and then apply the `url_encode` function to each value.
+
+For more information about how SQLPage functions are evaluated, and data types in SQLPage, read [the SQLPage data model documentation](/extensions-to-sql).
+' as contents_md where $function IS NULL;
+
+select 'list' as component, 'SQLPage functions' as title where $function IS NULL;
+select name as title,
+    icon,
+    '?function=' || name || '#function' as link,
+    $function = name as active
+from sqlpage_functions
+where $function IS NULL
+order by name;
+
+select 'text' as component, 'sqlpage.' || $function || '(' || string_agg(name, ', ') || ')' as title, 'function' as id
+from sqlpage_function_parameters where $function IS NOT NULL and "function" = $function;
+
+select 'text' as component;
+select 'Introduced in SQLPage ' || introduced_in_version || '.' as contents, 1 as size from sqlpage_functions where name = $function;
+
+SELECT description_md as contents_md FROM sqlpage_functions WHERE name = $function;
+
+select 'title' as component, 3 as level, 'Parameters' as contents where $function IS NOT NULL AND EXISTS (SELECT 1 from sqlpage_function_parameters where "function" = $function);
+select 'card' as component, 3 AS columns where $function IS NOT NULL;
+select
+    name as title,
+    description_md as description,
+    type as footer,
+    'azure' as color
+from sqlpage_function_parameters where "function" = $function
+ORDER BY "index";
+
+select
+    'button' as component,
+    'sm'     as size,
+    'pill'   as shape;
+select
+    name as title,
+    icon,
+    sqlpage.set_variable('function', name) as link
+from sqlpage_functions
+where $function IS NOT NULL
+order by name;