Added support for rel attributes in links

closes #62

fgs/datatypes.py

@@ -546,6 +546,20 @@ class Link:
             return self.url
     urlwithanchor = property(get_urlwithanchor, None, None)
 
+    def get_rel(self) -> str|None:
+        """
+        Get the relation in the context of the rel html attribute for this link
+        or None if no relation is known.
+        https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel
+        """
+        if self.type != "slug":
+            return None
+        if "rel" not in self.page.metadata:
+            return None
+        return self.page.metadata["rel"]
+    rel = property(get_rel, None, None)
+
+
 
 
 

theme/templates/macros/common.html

@@ -149,7 +149,7 @@
 {%- endmacro -%}
 
 {%- macro render_link_raw(link, content, lang, attr, title) -%}
-	{%- set ns = namespace(relation=None, url=None, objtype=None, obj=None) -%}
+	{%- set ns = namespace(relation=None, url=None, objtype=None, obj=None, rel=None) -%}
 	{%- call(resolvedlink, objtype, obj) resolve_link(link) -%}
 		{%- set ns.url = resolvedlink.urlwithanchor -%}
 		{%- set ns.objtype = objtype -%}
@@ -163,8 +163,11 @@
 			{%- endif -%}
 		{%- endif -%}
 	{%- endcall -%}
+	{%- if ns.objtype == "slug" -%}
+		{%- set ns.rel = ns.obj.link.rel -%}
+	{%- endif -%}
 	{%- set target = config.link_target[ns.relation] -%}
-	<a {{ render_attr(attr, lang, extra_classes=[ns.relation], extra={"href": ns.url, "title": {"value":title, "escape": true}, "target": target}) }}>
+	<a {{ render_attr(attr, lang, extra_classes=[ns.relation], extra={"href": ns.url, "title": {"value":title, "escape": true}, "target": target, "rel": ns.rel}) }}>
 		{{- caller(ns.objtype, ns.obj,ns.url,ns.relation) -}}
 	</a>
 {%- endmacro -%}