From 3969a288b2c18b1b4da9a9941a8a3a77480dd4d1 Mon Sep 17 00:00:00 2001
From: Stefano Zacchiroli <zack@upsilon.cc>
Date: Wed, 6 Jul 2005 17:15:02 +0000
Subject: [PATCH] added index.theory handling

---
 helm/ocaml/getter/http_getter.ml | 52 +++++++++++++++++++++++++++-----
 1 file changed, 44 insertions(+), 8 deletions(-)

diff --git a/helm/ocaml/getter/http_getter.ml b/helm/ocaml/getter/http_getter.ml
index dd4e483fa..43c4be473 100644
--- a/helm/ocaml/getter/http_getter.ml
+++ b/helm/ocaml/getter/http_getter.ml
@@ -67,7 +67,7 @@ let showable_file_RE      =
   Pcre.regexp "(\\.con|\\.ind|\\.var|\\.body|\\.types|\\.proof_tree)$"
 
 let xml_suffix = ".xml"
-let theory_suffix = ".theory" ^ xml_suffix
+let theory_suffix = ".theory"
 
   (* global maps, shared by all threads *)
 
@@ -134,6 +134,7 @@ let resolve_remote uri =
 let help () = Http_getter_const.usage_string (Http_getter_env.env_to_string ())
 
 let exists uri =
+  prerr_endline ("Http_getter.exists " ^ uri);
   if remote () then
     exists_remote uri
   else
@@ -147,10 +148,17 @@ let resolve uri =
       Http_getter_storage.resolve (uri ^ xml_suffix)
     with Http_getter_storage.Resource_not_found _ -> raise (Key_not_found uri)
 
+let deref_index_theory uri =
+  if is_theory_uri uri && Filename.basename uri = "index.theory" then
+    strip_trailing_slash (Filename.dirname uri) ^ theory_suffix
+  else
+    uri
+
 let getxml uri =
   if remote () then getxml_remote uri
   else begin
     try
+      let uri = deref_index_theory uri in
       Http_getter_storage.filename (uri ^ xml_suffix)
     with Http_getter_storage.Resource_not_found _ -> raise (Key_not_found uri)
   end
@@ -221,9 +229,19 @@ let collect_ls_items dirs_set objs_tbl =
     objs_tbl;
   List.rev !items
 
+let contains_object = (<>) []
+(*   List.iter
+    (function
+      | Ls_section name -> prerr_endline (name ^ "/");
+      | Ls_object obj -> prerr_endline obj.uri)
+    l;
+  prerr_endline (string_of_bool b);
+  b *)
+(*   List.exists (function Ls_object _ -> true | _ -> false) *)
+
   (** non regexp-aware version of ls *)
-let dumb_ls uri_prefix =
-(*   prerr_endline ("Http_getter.dumb_ls " ^ uri_prefix); *)
+let rec dumb_ls uri_prefix =
+  prerr_endline ("Http_getter.dumb_ls " ^ uri_prefix);
   if is_cic_obj_uri uri_prefix then begin
     let dirs = ref StringSet.empty in
     let objs = Hashtbl.create 17 in
@@ -239,23 +257,41 @@ let dumb_ls uri_prefix =
     collect_ls_items !dirs objs
   end else if is_theory_uri uri_prefix then begin
     let items = ref [] in
+    let add_theory fname =
+      items :=
+        Ls_object {
+          uri = fname; ann = false; types = No; body = No; proof_tree = No }
+        :: !items
+    in
+    let cic_uri_prefix =
+      Pcre.replace_first ~rex:heading_theory_RE ~templ:"cic:" uri_prefix
+    in
     List.iter
       (fun fname ->
         if ends_with_slash fname then
           items := Ls_section (strip_trailing_slash fname) :: !items
         else
           try
-            let obj =
-              { uri = strip_suffix ~suffix:xml_suffix fname;
-                ann = false; types = No; body = No; proof_tree = No }
-            in
-            items := Ls_object obj :: !items
+            let fname = strip_suffix ~suffix:xml_suffix fname in
+            let theory_name = strip_suffix ~suffix:theory_suffix fname in
+            let sub_theory = normalize_dir cic_uri_prefix ^ theory_name ^ "/" in
+            if is_empty_theory sub_theory then add_theory fname
           with Invalid_argument _ -> ())
       (Http_getter_storage.ls uri_prefix);
+    (try
+      if contains_object (dumb_ls cic_uri_prefix)
+        && exists (strip_trailing_slash uri_prefix ^ theory_suffix)
+      then
+        add_theory "index.theory";
+    with Unresolvable_URI _ -> ());
     !items
   end else
     raise (Invalid_URI uri_prefix)
 
+and is_empty_theory uri_prefix =
+  prerr_endline ("is_empty_theory " ^ uri_prefix);
+  not (contains_object (dumb_ls uri_prefix))
+
   (* handle simple regular expressions of the form "...(..|..|..)..." on cic
    * uris, not meant to be a real implementation of regexp. The only we use is
    * "(cic|theory):/..." *)
-- 
2.39.2