diff -r 787ba1d19d3a -r 52cb065aa916 src/Pure/Thy/thy_info.ML
--- a/src/Pure/Thy/thy_info.ML	Wed Nov 18 15:41:02 2020 +0100
+++ b/src/Pure/Thy/thy_info.ML	Wed Nov 18 15:47:53 2020 +0100
@@ -1,8 +1,8 @@
 (*  Title:      Pure/Thy/thy_info.ML
-    Author:     Markus Wenzel, TU Muenchen
+    Author:     Makarius
 
 Global theory info database, with auto-loading according to theory and
-file dependencies.
+file dependencies, and presentation of theory documents.
 *)
 
 signature THY_INFO =
@@ -28,7 +28,68 @@
 structure Thy_Info: THY_INFO =
 struct
 
-(** presentation of consolidated theory **)
+(** theory presentation **)
+
+(* artefact names *)
+
+fun document_name ext thy =
+  Path.explode_binding0 ("document/" ^ Context.theory_name thy ^ "." ^ ext);
+
+val document_html_name = document_name "html";
+val document_tex_name = document_name "tex";
+
+fun html_name thy = Path.basic (Context.theory_name thy ^ ".html");
+
+
+(* theory as HTML *)
+
+local
+
+fun get_session_chapter thy =
+  let
+    val session = Resources.theory_qualifier (Context.theory_long_name thy);
+    val chapter = Resources.session_chapter session;
+  in (session, chapter) end;
+
+fun theory_link thy thy' =
+  let
+    val ((session, chapter), (session', chapter')) = apply2 get_session_chapter (thy, thy');
+    val link = html_name thy';
+  in
+    if session = session' then link
+    else if chapter = chapter' then Path.parent + Path.basic session' + link
+    else Path.parent + Path.parent + Path.basic chapter' + Path.basic session' + link
+  end;
+
+fun theory_document symbols A Bs body =
+  HTML.begin_document symbols ("Theory " ^ A) ^ "\n" ^
+  HTML.command symbols "theory" ^ " " ^ HTML.name symbols A ^ "<br/>\n" ^
+  (if null Bs then ""
+   else
+    HTML.keyword symbols "imports" ^ " " ^
+      space_implode " " (map (uncurry HTML.href_path o apsnd (HTML.name symbols)) Bs) ^ "<br/>\n") ^
+  "\n</div>\n<div class=\"source\">\n<pre class=\"source\">" ::
+  body @ ["</pre>\n", HTML.end_document];
+
+in
+
+fun export_html thy spans =
+  let
+    val name = Context.theory_name thy;
+    val parents =
+      Theory.parents_of thy |> map (fn thy' =>
+        (Url.File (theory_link thy thy'), Context.theory_name thy'));
+
+    val symbols = Resources.html_symbols ();
+    val keywords = Thy_Header.get_keywords thy;
+    val body = map (HTML.present_span symbols keywords) spans;
+    val html = XML.blob (theory_document symbols name parents body);
+  in Export.export thy (document_html_name thy) html end
+
+end;
+
+
+(* hook for consolidated theory *)
 
 type presentation_context =
   {options: Options.T, file_pos: Position.T, adjust_pos: Position.T -> Position.T,
@@ -52,7 +113,7 @@
 
 val _ =
   Theory.setup (add_presentation (fn {options, file_pos, segments, ...} => fn thy =>
-   (Present.export_html thy (map #span segments);
+   (export_html thy (map #span segments);
     if exists (Toplevel.is_skipped_proof o #state) segments then ()
     else
       let
@@ -62,7 +123,7 @@
         else
           let
             val thy_name = Context.theory_name thy;
-            val document_tex_name = Present.document_tex_name thy;
+            val document_tex_name = document_tex_name thy;
 
             val latex = Latex.isabelle_body thy_name body;
             val output = [Latex.output_text latex, Latex.output_positions file_pos latex];