(* Copyright (C) 2004-2011, HELM Team.
 * 
 * This file is part of HELM, an Hypertextual, Electronic
 * Library of Mathematics, developed at the Computer Science
 * Department, University of Bologna, Italy.
 * 
 * HELM is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * HELM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HELM; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA  02111-1307, USA.
 * 
 * For details, see the HELM World-Wide-Web page,
 * http://helm.cs.unibo.it/
 *)

exception SvnError of string;;

let exec_process cmd =
  let (stdout, stdin, stderr) as chs = Unix.open_process_full cmd [||] in
  let outlines = ref [] in
  let errlines = ref [] in
  (try
     while true do
       outlines := input_line stdout :: !outlines;
     done;
     assert false
   with End_of_file -> 
   (try
     while true do
       errlines := input_line stderr :: !errlines;
     done;
     assert false
    with End_of_file -> 
     match (Unix.close_process_full chs) with
     | Unix.WEXITED errno -> 
        let output = "std out =\n" ^ String.concat "\n" (List.rev !outlines) in
        let errors = "std err =\n" ^ String.concat "\n" (List.rev !errlines) in
        errno, output ^ "\n\n" ^ errors
     | _ -> assert false))

let checkout user =
  let rt_dir = Helm_registry.get "matita.rt_base_dir" in
  let repo = Helm_registry.get "matita.weblib" in

  let errno, outstr = exec_process 
    ("svn co " ^ repo ^ " " ^ rt_dir ^ "/users/" ^ user ^ "/")
  in
  if errno = 0 then ()
  else raise (SvnError outstr)

let html_of_library uid =
  let i = ref 0 in
  let newid () = incr i; ("node" ^ string_of_int !i) in

  let branch text acc =
    let id = newid () in
    "<span class=\"trigger\" onClick=\"showBranch(" ^ id ^ ")\">\n" ^
    "<img src=\"treeview/closed.gif\" id=\"I" ^ id ^ "\"/>\n" ^
    text ^ "<br/></span>\n" ^
    "<span class=\"branch\" id=\"" ^ id ^ "\">\n" ^
    acc ^ "\n</span>"
  in
  let leaf text link =
    "<img src=\"treeview/doc.gif\"/>\n" ^
    "<a href=\"" ^ link ^ "\">" ^ text ^ "</a><br/>"
  in

  let rec aux path =
    let dirlist = Array.to_list (Sys.readdir path) in
    let subdirs = List.filter (fun x -> Sys.is_directory (path ^ "/" ^ x)) dirlist in
    let scripts = 
      List.filter (fun x -> 
        try
          let i = String.rindex x '.' in
          not (Sys.is_directory (path ^ "/" ^ x)) && (String.sub x i 3 = ".ma")
        with Not_found | Invalid_argument _ -> false) dirlist in
    let subdirtags = 
      String.concat "\n" (List.map (fun x -> aux (path ^ "/" ^ x)) subdirs) in
    let scripttags =
      String.concat "\n" 
       (List.map (fun x -> leaf x (path ^ "/" ^ x)) scripts)
    in
    branch (Filename.basename path) (subdirtags ^ "\n" ^ scripttags)
  in

  let basedir = (Helm_registry.get "matita.rt_base_dir") ^ "/users/" ^ uid ^ "/" in
  let res = aux basedir in
  prerr_endline "BEGIN TREE";prerr_endline res;prerr_endline "END TREE";
  res
;;