From d747da7b7a32c08eb948f22ac505003a7adce2c4 Mon Sep 17 00:00:00 2001
From: Claudio Sacerdoti Coen <claudio.sacerdoticoen@unibo.it>
Date: Thu, 26 May 2005 16:04:05 +0000
Subject: [PATCH] Now the links to 7 pages at a time are shown. Cool.

---
 .../searchEngine/html/moogle_trailer.html.src |  2 +-
 helm/searchEngine/searchEngine.ml             | 34 +++++++++++++++++--
 2 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/helm/searchEngine/html/moogle_trailer.html.src b/helm/searchEngine/html/moogle_trailer.html.src
index 5f067c78a..be349ba52 100644
--- a/helm/searchEngine/html/moogle_trailer.html.src
+++ b/helm/searchEngine/html/moogle_trailer.html.src
@@ -4,6 +4,6 @@
   xmlns="http://www.w3.org/1999/xhtml"
 >
   <div class='bottombar'>
-    Page: @PREV_LINK@ <b>@PAGE@/@PAGES@</b> @NEXT_LINK@
+    @PAGES@: @PREV_LINK@ <b>@PAGELIST@</b> @NEXT_LINK@
   </div>
 </helm:content>
diff --git a/helm/searchEngine/searchEngine.ml b/helm/searchEngine/searchEngine.ml
index b7a699c2c..afb274f46 100644
--- a/helm/searchEngine/searchEngine.ml
+++ b/helm/searchEngine/searchEngine.ml
@@ -43,7 +43,7 @@ let placeholders = [
   "ACTION"; "ADVANCED"; "ADVANCED_CHECKED"; "CHOICES"; "CURRENT_CHOICES";
   "EXPRESSION"; "ID"; "IDEN"; "ID_TO_URIS"; "INTERPRETATIONS";
   "INTERPRETATIONS_LABELS"; "MSG"; "NEW_ALIASES"; "NEXT_LINK"; "NO_CHOICES";
-  "PAGE"; "PAGES"; "PREV_LINK"; "QUERY_KIND"; "QUERY_SUMMARY"; "RESULTS";
+  "PAGE"; "PAGES"; "PAGELIST"; "PREV_LINK"; "QUERY_KIND"; "QUERY_SUMMARY"; "RESULTS";
   "SEARCH_ENGINE_URL"; "SIMPLE_CHECKED"; "TITLE";
 ]
 
@@ -145,6 +145,14 @@ let patch_param param_name param_value url =
   (** HTML encoding, e.g.: "<" -> "&lt;" *)
 let html_encode = Netencoding.Html.encode_from_latin1
 
+let fold_n_to_m f n m acc =
+ let rec aux acc =
+  function
+     i when i <= m -> aux (f i acc) (i + 1)
+   | _ -> acc
+ in
+  aux acc n
+
 let send_results results
   ?(id_to_uris = CicTextualParser2.EnvironmentP3.of_string "") 
    (req: Http_types.request) outchan
@@ -181,9 +189,28 @@ let send_results results
             results_no / results_per_page + 1
         in
         let pages = if pages = 0 then 1 else pages in
+        let additional_pages = 3 in
         let (summary, results) = MooglePp.theory_of_result page results in
         [ tag "PAGE", string_of_int page;
-          tag "PAGES", string_of_int pages;
+          tag "PAGES", string_of_int pages ^ " Pages";
+          tag "PAGELIST",
+          (let inf = page - additional_pages in
+           let sup = page + additional_pages in
+           let superinf = inf - (sup - pages) in
+           let supersup = sup + (1 - inf) in
+           let n,m =
+            if inf >= 1 && sup <= pages then
+             inf,sup
+            else if inf < 1 then
+             1, (if supersup <= pages then supersup else pages)
+            else (* sup > pages *)
+             (if superinf >= 1 then superinf else 1),pages
+           in
+            fold_n_to_m
+             (fun n acc -> acc ^ " " ^
+                          (if n = page then string_of_int n
+                           else page_link (string_of_int n) n))
+             n m "");
           tag "PREV_LINK", (if page > 1 then page_link "Prev" (page-1) else "");
           tag "NEXT_LINK",
             (if page < pages then page_link "Next" (page+1) else "");
@@ -192,7 +219,8 @@ let send_results results
           tag "RESULTS", results ]
     | `Error msg ->
         [ tag "PAGE", "1";
-          tag "PAGES", "1";
+          tag "PAGES", "1 Page";
+          tag "PAGELIST", "";
           tag "PREV_LINK", "";
           tag "NEXT_LINK", "";
           tag "QUERY_KIND", query_kind;
-- 
2.39.2