examples.ml lol that was hard

boot_js.ml

@@ -118,5 +118,6 @@ let _ =
         images);
   buffered_loop (make_event Dom_html.Event.keydown) Dom_html.document
     (fun ev _ ->
+      Dom.preventDefault ev;
       Lwt.return
       @@ push_event (Some (`Keys [ Event_js.evt_of_jskey ev ])))

dune

@@ -1,20 +1,31 @@
 (env
  (dev (flags (:standard -warn-error -A))
-  (js_of_ocaml (flags --no-inline --pretty --source-map-inline --debug-info)
+  (js_of_ocaml (flags :standard)
-   (build_runtime_flags --no-inline --pretty --source-map-inline --debug-info)
+   (build_runtime_flags :standard --no-inline --debug-info)
-   (link_flags --source-map-inline))))
+   (compilation_mode whole_program)
+   (link_flags :standard))))
+
+(library
+ (name log_js)
+  (modes byte)
+ (preprocess (pps js_of_ocaml-ppx))
+ (flags (:standard -rectypes -linkall))
+ (modules log_js)
+ (libraries
+   logs))
 
 (executable
  (name boot_js)
  (modes byte js)
  (preprocess (pps js_of_ocaml-ppx)) 
-
+ (flags (:standard -rectypes -linkall))
  (modules boot_js human)
  (libraries
    fmt
-   logs
    graphv_webgl
    js_of_ocaml-lwt
+   js_of_ocaml-compiler
+   js_of_ocaml-toplevel
    digestif.ocaml
    checkseum.ocaml
    irmin.mem
@@ -23,8 +34,127 @@
    cohttp-lwt-jsoo
    mimic
    uri
-   zed
    gg
    lwd
-))
+   log_js))
 
+(rule
+ (targets test_dynlink.cmo test_dynlink.cmi)
+ (action
+  (run ocamlc -c %{dep:test_dynlink.ml})))
+
+(rule
+ (targets test_dynlink.js)
+ (action
+  (run %{bin:js_of_ocaml} --pretty --toplevel %{dep:test_dynlink.cmo})))
+
+(rule
+ (targets embedded_fs.js)
+ (action
+  (run %{bin:jsoo_fs} -I . -o %{targets} %{dep:examples.ml} %{dep:test_dynlink.js})))
+
+(rule
+ (targets export.txt)
+ (deps
+  (package js_of_ocaml-ppx)
+  (package js_of_ocaml)
+  (package js_of_ocaml-compiler)
+  (package js_of_ocaml-lwt)
+  (package js_of_ocaml-tyxml)
+  (package js_of_ocaml-toplevel))
+ (action
+  (run
+    jsoo_listunits
+    -o
+    %{targets}
+    stdlib
+    graphics
+    str
+    dynlink
+    js_of_ocaml-compiler.runtime
+    js_of_ocaml-lwt.graphics
+    js_of_ocaml-ppx.as-lib
+    js_of_ocaml.deriving
+    lwt
+    tyxml.functor
+    tyxml.functor:html_types.cmi
+    react
+    reactiveData
+    js_of_ocaml
+    js_of_ocaml-lwt
+    js_of_ocaml-tyxml
+    js_of_ocaml-toplevel
+    dynlink)))
+
+(executables
+ (names toplevel)
+ (modules toplevel ppx_graph)
+ (flags
+  (:standard -rectypes -linkall))
+ (modes js)
+ (js_of_ocaml
+  (flags
+   compile
+   --pretty
+   --Werror
+   --target-env
+   browser
+   --export
+   %{dep:export.txt}
+   --toplevel
+   --disable
+   shortvar
+   +toplevel.js
+   +dynlink.js
+   %{dep:embedded_fs.js}))
+ (preprocess
+  (pps js_of_ocaml-ppx))
+ (libraries
+  js_of_ocaml-compiler
+  js_of_ocaml-tyxml
+  js_of_ocaml-toplevel
+  lwt
+  js_of_ocaml-lwt
+  ;; not used directly
+  graphics
+  js_of_ocaml.deriving
+  js_of_ocaml-lwt.graphics
+  js_of_ocaml-ppx.as-lib
+  compiler-libs
+  compiler-libs.common
+  compiler-libs.bytecomp
+  js_of_ocaml-compiler.runtime
+  ocp-indent.lib
+  react
+  reactiveData
+  str
+  log_js)
+)
+
+; (rule
+;  (targets toplevel.js)
+;  (deps examples.ml)
+;  (action
+;   (run
+;    %{bin:js_of_ocaml}
+;    compile
+;    --pretty
+;    --Werror
+;    --target-env
+;    browser
+;    --extern-fs
+;    "--file=%{dep:examples.ml}"
+;    --export
+;    %{dep:export.txt}
+;    --toplevel
+;    --disable
+;    shortvar
+;    +toplevel.js
+;    +dynlink.js
+;    %{dep:toplevel.bc}
+;    -o
+;    %{targets})))
+
+(alias
+  (name default)
+  (deps toplevel.bc.js index.html toplevel.html))

human.ml

@@ -1,3 +1,40 @@
+(* ok it's monad time *)
+(*
+
+1. implement toplevel eval of git repo content
+1. eval `/init` on startup for now
+1. start looking under the hood of js_of_ocaml top level to see if
+   1. there are ways to display and allow easy manipulation of the values used when calling
+Irmin.S.Tree.fold on things.
+   1. Make sure js_of_ocaml toplevel and native top level of ocaml 5.0
+are reasonably compatible in this "under the hood" stuff
+   1. save all JSOOTOP input into a history file that gets committed for each command!!
+1. Build a text editor based on irmin-tree?
+   1. What you really want is a data structure that is easy for you to call commands on to manipulate the values of
+irmin stores
+   1. If you go by the default, a text file is split into a list of lines,
+which has a cursor which is an index into the list of lines, and an index into the specific line.
+   1. Various common cursor movement commands should be bound to the common keys
+   1. A display of the cursor data structure values
+1. these commands just mutate the cursor state, so the text editor is just the structure of the Lwd.vars which are Lwd.get'd and mapped against the Tree.watch ified stuff???
+ughhh
+
+1. but yea fold being
+
+
+1. fix fetching of `console/boot` so it doesn't crash and can deal!!!!
+    1. like just tell it to fetch teh latest commit or something
+
+
+
+
+
+
+
+
+
+*)
+
 (* why *)
 
 (*
@@ -3163,7 +3200,7 @@ module Widgets = struct
                                  else `Unhandled))
                      | [ (`Uchar u, [ `Ctrl ]) ] when eq_uc_c u 'k' ->
                          `Handled
-                     | [ (`Uchar u, [ `Ctrl ]) ] when eq_uc_c u 'x' ->
+                     | [ (`Uchar s, [ `Ctrl ]) ] when eq_uc_c s 's' ->
                          let b = Buffer.create 1024 in
                          Lwd_table.iter
                            (fun line ->
@@ -3268,47 +3305,6 @@ module Widgets = struct
                  | [ (`Backspace, []) ] -> `Unhandled
                  | _ -> `Unhandled)))
 
-  (* let cursorview =
-       Lwd.var @@ Lwd.pure @@ string "initializing..."
-     in
-     let cv, push_cv = Lwt_stream.create () in
-     let cvroot =
-       Lwd.observe ~on_invalidate:(fun _ ->
-           Log.info (fun m ->
-               m
-                 "tree_nav cursorviewroot on_invalidate push_cv \
-                  triggered??");
-           push_cv (Some ()))
-       @@ Lwd.map (Lwd.get cursor) ~f:(function
-            | Some cursor_row -> (
-                match Lwd_table.get cursor_row with
-                | Some (focus, step) -> (
-                    let path' = path @ [ step ] in
-                    Nav.S.kind store path' >>= function
-                    | Some `Node -> lwt_lwd_string "Sub-node??"
-                    | Some `Contents -> node_edit_area (store, path')
-                    | None ->
-                        lwt_lwd_string
-                          ("Nav.S.kind " ^ String.concat "/" path'
-                         ^ " -> None?"))
-                | None ->
-                    lwt_lwd_string "cursor table row doesn't exist")
-            | None -> lwt_lwd_string "cursor doesn't exist")
-     in
-     Lwt.async (fun () ->
-         Lwt_stream.iter_s
-           (fun _ ->
-             Lwd.quick_sample cvroot >>= fun cursorview'' ->
-             Log.info (fun m ->
-                 m "tree_nav Lwt.async (Lwd.set cursorview)");
-             Lwt.return (Lwd.set cursorview cursorview''))
-           cv);
-       push_cv (Some ()); *)
-  (*|> Lwd.map2
-       (Lwd.join @@ Lwd.get cursorview)
-       ~f:(fun cursorview' tree_view ->
-         Ui.join_x tree_view cursorview') *)
-
   open Lwt.Infix
 
   let rec node_ui ?(focus = Focus.make ()) store path

log_js.ml

@@ -0,0 +1,56 @@
+module Logs_reporter = struct
+  (* Console reporter *)
+
+  open Jsoo_runtime
+
+  let console : Logs.level -> string -> unit =
+   fun level s ->
+    let meth =
+      match level with
+      | Logs.Error -> "error"
+      | Logs.Warning -> "warn"
+      | Logs.Info -> "info"
+      | Logs.Debug -> "debug"
+      | Logs.App -> "log"
+    in
+    ignore
+      (Js.meth_call
+         (Js.pure_js_expr "console")
+         meth
+         [| Js.string s |])
+
+  let ppf, flush =
+    let b = Buffer.create 255 in
+    let flush () =
+      let s = Buffer.contents b in
+      Buffer.clear b;
+      s
+    in
+    (Format.formatter_of_buffer b, flush)
+
+  let hook =
+    ref (fun level s ->
+        ignore (Logs.level_to_string (Some level) ^ ": " ^ s))
+
+  let console_report _src level ~over k msgf =
+    let k _ =
+      let s = flush () in
+      console level s;
+      !hook level s;
+      over ();
+      k ()
+    in
+    msgf @@ fun ?header ?tags fmt ->
+    let _tags = tags in
+    match header with
+    | None -> Format.kfprintf k ppf ("@[" ^^ fmt ^^ "@]@.")
+    | Some h -> Format.kfprintf k ppf ("[%s] @[" ^^ fmt ^^ "@]@.") h
+
+  let console_reporter () = { Logs.report = console_report }
+end
+
+let _ =
+  Logs.set_reporter (Logs_reporter.console_reporter ());
+  Logs.set_level (Some Debug)
+
+module Log = Logs

ppx_graph.ml

@@ -0,0 +1,11 @@
+open Ppxlib
+open Log_js
+
+let log_info pp exp =
+  Log.info (fun m -> m "ppx_graph: %a" pp exp);
+  exp
+
+let init () =
+  Driver.register_transformation
+    ~impl:(log_info Ocaml_common.Pprintast.structure)
+    "ppx_graph"

toplevel.html

@@ -0,0 +1,230 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
+          "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+  <head>
+    <title>OCaml toplevel</title>
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+    <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" />
+    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" />
+    <style>
+
+      code, kbd, pre, samp {
+      font-family: Menlo,Monaco,Consolas,monospace;
+      }
+      body,html {
+      height: 100%;
+      background-color:#eee;
+      }
+
+      #toplevel-container {
+      width: 50%;
+      background-color: black;
+      color: #ccc;
+      overflow: auto;
+      overflow-x: hidden;
+      height: 100%;
+      float:left;
+      padding:10px;
+      padding-top: 20px;
+      }
+
+      #toplevel-container pre#output {
+      padding: 0px;
+      }
+
+      #toplevel-container #output {
+      background-color:transparent;
+      color: #ccc;
+      border: none;
+      line-height:18px;
+      font-size: 12px;
+      margin-bottom: 0px;
+      }
+
+      #toplevel-container textarea {
+      width:90%;
+      line-height:18px;
+      font-size: 12px;
+      background-color: transparent;
+      color: #fff;
+      border: 0;
+      resize: none;
+      outline: none;
+      font-family: Menlo,Monaco,Consolas,monospace;
+      font-weight: bold;
+      float:left;
+      margin: 0px;
+      padding:0px;
+      }
+      #toplevel-container #sharp {
+      float: left;
+      line-height:18px;
+      font-size: 12px;
+      font-family: Menlo,Monaco,Consolas,monospace;
+      white-space: pre;
+      }
+      .sharp:before{
+      content:"# ";
+      line-height:18px;
+      font-size: 12px;
+      font-family: Menlo,Monaco,Consolas,monospace;
+      }
+      .caml{
+      color:rgb(110, 110, 201);
+      }
+      #toplevel-side{
+      position:relative;
+      width:45%;
+      height: 100%;
+      overflow: auto;
+      text-align:justify;
+      float:left;
+      margin-left:30px;
+      }
+      #toplevel-side ul{
+      padding: 0px;
+      list-style-type: none;
+      }
+
+      .stderr {
+      color: #d9534f;
+      }
+      .stdout {
+
+      }
+      .errorloc{
+      border-bottom-width: 3px;
+      border-bottom-style: solid;
+      border-bottom-color: red;
+      }
+      canvas {
+      border: 1px dashed black;
+      float: left;
+      margin: 7px;
+      }
+      #output canvas {
+      background-color: #464646;
+      float: none;
+      display: block;
+      border: 1px dashed while;
+      margin: 7px;
+      }
+      #output img {
+      display:block;
+      }
+      #toplevel-examples {
+      width: 270px;
+      float: left;
+      }
+      #toplevel-examples .list-group-item{
+      padding: 5px 15px;
+      }
+      #btn-share {
+      float:right;
+      margin-top:-20px;
+      background-color:rgb(92, 129, 184);
+      border-color: rgb(70, 75, 128);
+      padding: 1px 5px;
+      display:none;
+      }
+      .clear { clear:both; }
+
+      .sharp .id { color: #59B65C ; font-style: italic }
+      .sharp .kw0 { color: rgb(64, 75, 190); font-weight: bold ;}
+      .sharp .kw1 { color: rgb(150, 0, 108); font-weight: bold ;}
+      .sharp .kw2 { color: rgb(23, 100, 42); font-weight: bold ;}
+      .sharp .kw3 { color: #59B65C; font-weight: bold ;}
+      .sharp .kw4 { color: #59B65C; font-weight: bold ;}
+      .sharp .comment { color: green ; font-style: italic ; }
+      .sharp .string { color: #6B6B6B; font-weight: bold ; }
+      .sharp .text { }
+      .sharp .numeric { color: #729AAF; }
+      .sharp .directive { font-style: italic ; color : #EB00FF; } ;
+      .sharp .escape { color: #409290 ; }
+      .sharp .symbol0 { color: orange ; font-weight: bold ; }
+      .sharp .symbol1 { color: #993300 ; font-weight: bold ; }
+      .sharp .constant { color: rgb(0, 152, 255); }
+    </style>
+    <script type="text/javascript">
+
+      window.onhashchange = function() { window.location.reload() }
+      var hash = window.location.hash.replace(/^#/,"");
+      var fields = hash.split(/&/);
+      var prefix = "";
+      var version = "";
+      for(var f in fields){
+        var data = fields[f].split(/=/);
+        if(data[0] == "version"){
+          version = data[1].replace(/%20|%2B/g,"+");
+          break;
+        }
+      }
+      function load_script(url){
+        var fileref=document.createElement('script');
+        fileref.setAttribute("type","text/javascript");
+        fileref.setAttribute("src", prefix+(version==""?"":(version+"/"))+url);
+        document.getElementsByTagName("head")[0].appendChild(fileref);
+      }
+      load_script("_build/default/exported-unit.cmis.js");
+      load_script("_build/default/toplevel.bc.js");
+
+    </script>
+  </head>
+  <body>
+    <div id="toplevel-container">
+      <pre id="output"></pre>
+      <div>
+        <div id="sharp" class="sharp"></div>
+        <textarea id="userinput">Loading ...</textarea>
+        <button type="button" class="btn btn-default"
+                id="btn-share">Share</button>
+      </div>
+    </div>
+    <div id="toplevel-side">
+      <h3>Js_of_ocaml</h3>
+      <h4>A compiler from OCaml bytecode to Javascript.</h4>
+      <p>It makes OCaml programs that run on Web browsers. It is
+        easy to install as it works with an existing installation of OCaml,
+        with no need to recompile any library. It comes with bindings for a
+        large part of the browser APIs.</p>
+      <p>This web-based OCaml toplevel is compiled using Js_of_ocaml.</p>
+      <h4>Command</h4>
+      <table class="table table-striped table-condensed">
+        <tbody class>
+          <tr>
+            <td>Enter/Return</td>
+            <td>Submit code</td>
+          </tr>
+          <tr>
+            <td>Ctrl + Enter</td>
+            <td>Newline</td>
+          </tr>
+          <tr>
+            <td>Up / Down</td>
+            <td>Browse history</td>
+          </tr>
+          <tr>
+            <td>Ctrl + l</td>
+            <td>Clear display</td>
+          </tr>
+          <tr>
+            <td>Ctrl + k</td>
+            <td>Reset toplevel</td>
+          </tr>
+          <tr>
+            <td>Tab</td>
+            <td>Indent code</td>
+          </tr>
+
+        </tbody>
+      </table>
+      <h4>Try to execute samples</h4>
+      <div id="toplevel-examples" class="list-group"></div>
+      <canvas width=200 height=200 id="test-canvas"></canvas>
+      <h4 class="clear">See the generated javascript code</h4>
+      <pre id="last-js">
+      </pre>
+    </div>
+  </body>
+</html>

toplevel.ml

@@ -0,0 +1,644 @@
+(* Js_of_ocaml toplevel
+ * http://www.ocsigen.org/js_of_ocaml/
+ * Copyright (C) 2011 Jérôme Vouillon
+ * Laboratoire PPS - CNRS Université Paris Diderot
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, with linking exception;
+ * either version 2.1 of the License, or (at your option) any later version.
+ *
+ * This program 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *)
+
+open Js_of_ocaml
+open Js_of_ocaml_lwt
+open Js_of_ocaml_tyxml
+open Js_of_ocaml_toplevel
+open Lwt
+
+module Graphics_support = struct
+  let init elt = Graphics_js.open_canvas elt
+end
+
+open Log_js
+
+module Ppx_support = struct
+  let init () =
+    Ppx_graph.init ();
+    Ast_mapper.register "js_of_ocaml" (fun _ -> Ppx_js.mapper);
+    Ast_mapper.register "ppxlib" (fun _ ->
+        Log.info (fun m -> m "Ppxlib.mapper");
+        {
+          Ast_mapper.default_mapper with
+          structure =
+            (fun _ ->
+              Log.info (fun m -> m "Ppxlib.Driver.map_structure");
+              Ppxlib.Driver.map_structure);
+          signature =
+            (fun _ ->
+              Log.info (fun m -> m "Ppxlib.Driver.map_signature");
+              Ppxlib.Driver.map_signature);
+        })
+end
+
+module Colorize = struct
+  open Js_of_ocaml
+  open Js_of_ocaml_tyxml
+
+  let text ~a_class:cl s =
+    Tyxml_js.Html.(span ~a:[ a_class [ cl ] ] [ txt s ])
+
+  let ocaml = text
+
+  let highlight from_ to_ e =
+    match Js.Opt.to_option e##.textContent with
+    | None -> assert false
+    | Some x ->
+        let x = Js.to_string x in
+        let (`Pos from_) = from_ in
+        let to_ =
+          match to_ with `Pos n -> n | `Last -> String.length x - 1
+        in
+        e##.innerHTML := Js.string "";
+        let span kind s =
+          if s <> "" then
+            let span =
+              Tyxml_js.Html.(span ~a:[ a_class [ kind ] ] [ txt s ])
+            in
+            Dom.appendChild e (Tyxml_js.To_dom.of_element span)
+        in
+        span "normal" (String.sub x 0 from_);
+        span "errorloc" (String.sub x from_ (to_ - from_));
+        span "normal" (String.sub x to_ (String.length x - to_))
+end
+
+module Indent : sig
+  val textarea : Dom_html.textAreaElement Js.t -> unit
+end = struct
+  let _ = Approx_lexer.enable_extension "lwt"
+
+  let indent s in_lines =
+    let output =
+      {
+        IndentPrinter.debug = false;
+        config = IndentConfig.default;
+        in_lines;
+        indent_empty = true;
+        adaptive = true;
+        kind = IndentPrinter.Print (fun s acc -> acc ^ s);
+      }
+    in
+    let stream = Nstream.of_string s in
+    IndentPrinter.proceed output stream IndentBlock.empty ""
+
+  let textarea (textbox : Dom_html.textAreaElement Js.t) : unit =
+    let rec loop s acc (i, pos') =
+      try
+        let pos = String.index_from s pos' '\n' in
+        loop s ((i, (pos', pos)) :: acc) (succ i, succ pos)
+      with _ -> List.rev ((i, (pos', String.length s)) :: acc)
+    in
+    let rec find (l : (int * (int * int)) list) c =
+      match l with
+      | [] -> assert false
+      | (i, (lo, up)) :: _ when up >= c -> (c, i, lo, up)
+      | (_, (_lo, _up)) :: rem -> find rem c
+    in
+    let v = textbox##.value in
+    let pos =
+      let c1 = textbox##.selectionStart
+      and c2 = textbox##.selectionEnd in
+      if
+        Js.Opt.test (Js.Opt.return c1)
+        && Js.Opt.test (Js.Opt.return c2)
+      then
+        let l = loop (Js.to_string v) [] (0, 0) in
+        Some (find l c1, find l c2)
+      else None
+    in
+    let f =
+      match pos with
+      | None -> fun _ -> true
+      | Some ((_c1, line1, _lo1, _up1), (_c2, line2, _lo2, _up2)) ->
+          fun l -> l >= line1 + 1 && l <= line2 + 1
+    in
+    let v = indent (Js.to_string v) f in
+    textbox##.value := Js.string v;
+    match pos with
+    | Some ((c1, line1, _lo1, up1), (c2, line2, _lo2, up2)) ->
+        let l = loop v [] (0, 0) in
+        let lo1'', up1'' = List.assoc line1 l in
+        let lo2'', up2'' = List.assoc line2 l in
+        let n1 = max (c1 + up1'' - up1) lo1'' in
+        let n2 = max (c2 + up2'' - up2) lo2'' in
+        let () = (Obj.magic textbox)##setSelectionRange n1 n2 in
+        textbox##focus;
+        ()
+    | None -> ()
+end
+
+let compiler_name = "OCaml"
+let by_id s = Dom_html.getElementById s
+
+let by_id_coerce s f =
+  Js.Opt.get
+    (f (Dom_html.getElementById s))
+    (fun () -> raise Not_found)
+
+let do_by_id s f =
+  try f (Dom_html.getElementById s) with Not_found -> ()
+
+(* load file using a synchronous XMLHttpRequest *)
+let load_resource_aux filename url =
+  Js_of_ocaml_lwt.XmlHttpRequest.perform_raw
+    ~response_type:XmlHttpRequest.ArrayBuffer url
+  >|= fun frame ->
+  if frame.Js_of_ocaml_lwt.XmlHttpRequest.code = 200 then
+    Js.Opt.case frame.Js_of_ocaml_lwt.XmlHttpRequest.content
+      (fun () -> Printf.eprintf "Could not load %s\n" filename)
+      (fun b ->
+        Sys_js.update_file ~name:filename
+          ~content:(Typed_array.String.of_arrayBuffer b))
+  else ()
+
+let load_resource scheme ~prefix ~path:suffix =
+  let url = scheme ^ suffix in
+  let filename = Filename.concat prefix suffix in
+  Lwt.async (fun () -> load_resource_aux filename url);
+  Some ""
+
+let setup_pseudo_fs () =
+  Sys_js.mount ~path:"/dev/" (fun ~prefix:_ ~path:_ -> None);
+  Sys_js.mount ~path:"/http/" (load_resource "http://");
+  Sys_js.mount ~path:"/https/" (load_resource "https://");
+  Sys_js.mount ~path:"/ftp/" (load_resource "ftp://");
+  Sys_js.mount ~path:"/home/" (load_resource "filesys/")
+
+let exec' s =
+  let res : bool = JsooTop.use Format.std_formatter s in
+  if not res then Format.eprintf "error while evaluating %s@." s
+
+module Version = struct
+  type t = int list
+
+  let split_char ~sep p =
+    let len = String.length p in
+    let rec split beg cur =
+      if cur >= len then
+        if cur - beg > 0 then [ String.sub p beg (cur - beg) ] else []
+      else if sep p.[cur] then
+        String.sub p beg (cur - beg) :: split (cur + 1) (cur + 1)
+      else split beg (cur + 1)
+    in
+    split 0 0
+
+  let split v =
+    match
+      split_char
+        ~sep:(function '+' | '-' | '~' -> true | _ -> false)
+        v
+    with
+    | [] -> assert false
+    | x :: _ ->
+        List.map int_of_string
+          (split_char ~sep:(function '.' -> true | _ -> false) x)
+
+  let current : t = split Sys.ocaml_version
+  let compint (a : int) b = compare a b
+
+  let rec compare v v' =
+    match (v, v') with
+    | [ x ], [ y ] -> compint x y
+    | [], [] -> 0
+    | [], y :: _ -> compint 0 y
+    | x :: _, [] -> compint x 0
+    | x :: xs, y :: ys -> (
+        match compint x y with 0 -> compare xs ys | n -> n)
+end
+
+let setup_toplevel () =
+  JsooTop.initialize ();
+  Sys.interactive := false;
+  if Version.compare Version.current [ 4; 07 ] >= 0 then
+    exec' "open Stdlib";
+  exec'
+    "module Lwt_main = struct\n\
+    \             let run t = match Lwt.state t with\n\
+    \               | Lwt.Return x -> x\n\
+    \               | Lwt.Fail e -> raise e\n\
+    \               | Lwt.Sleep -> failwith \"Lwt_main.run: thread \
+     didn't return\"\n\
+    \            end";
+  let header1 =
+    Printf.sprintf "        %s version %%s" compiler_name
+  in
+  let header2 =
+    Printf.sprintf "     Compiled with Js_of_ocaml version %s"
+      Sys_js.js_of_ocaml_version
+  in
+  exec'
+    (Printf.sprintf "Format.printf \"%s@.\" Sys.ocaml_version;;"
+       header1);
+  exec' (Printf.sprintf "Format.printf \"%s@.\";;" header2);
+  exec' "#enable \"pretty\";;";
+  exec' "#disable \"shortvar\";;";
+  Ppx_support.init ();
+  let[@alert "-deprecated"] new_directive n k =
+    Hashtbl.add Toploop.directive_table n k
+  in
+  new_directive "load_js"
+    (Toploop.Directive_string
+       (fun name -> Js.Unsafe.global##load_script_ name));
+  Sys.interactive := true;
+  ()
+
+let resize ~container ~textbox () =
+  Lwt.pause () >>= fun () ->
+  textbox##.style##.height := Js.string "auto";
+  textbox##.style##.height
+  := Js.string (Printf.sprintf "%dpx" (max 18 textbox##.scrollHeight));
+  container##.scrollTop := container##.scrollHeight;
+  Lwt.return ()
+
+let setup_printers () =
+  exec'
+    "let _print_error fmt e = Format.pp_print_string fmt \
+     (Js_of_ocaml.Js_error.to_string e)";
+  Topdirs.dir_install_printer Format.std_formatter
+    Longident.(Lident "_print_error");
+  exec'
+    "let _print_unit fmt (_ : 'a) : 'a = Format.pp_print_string fmt \
+     \"()\"";
+  Topdirs.dir_install_printer Format.std_formatter
+    Longident.(Lident "_print_unit")
+
+let setup_examples ~container ~textbox =
+  let r = Regexp.regexp "^\\(\\*+(.*)\\*+\\)$" in
+  let all = ref [] in
+  (try
+     let ic = open_in "/static/examples.ml" in
+     while true do
+       let line = input_line ic in
+       match Regexp.string_match r line 0 with
+       | Some res ->
+           let name =
+             match Regexp.matched_group res 1 with
+             | Some s -> s
+             | None -> assert false
+           in
+           all := `Title name :: !all
+       | None -> all := `Content line :: !all
+     done;
+     assert false
+   with _ -> ());
+  let example_container = by_id "toplevel-examples" in
+  let _ =
+    List.fold_left
+      (fun acc tok ->
+        match tok with
+        | `Content line -> line ^ "\n" ^ acc
+        | `Title name ->
+            let a =
+              Tyxml_js.Html.(
+                a
+                  ~a:
+                    [
+                      a_class [ "list-group-item" ];
+                      a_onclick (fun _ ->
+                          textbox##.value := (Js.string acc)##trim;
+                          Lwt.async (fun () ->
+                              resize ~container ~textbox ()
+                              >>= fun () ->
+                              textbox##focus;
+                              Lwt.return_unit);
+                          true);
+                    ]
+                  [ txt name ])
+            in
+            Dom.appendChild example_container (Tyxml_js.To_dom.of_a a);
+            "")
+      "" !all
+  in
+  ()
+
+(* we need to compute the hash form href to avoid different encoding behavior
+     across browser. see Url.get_fragment *)
+let parse_hash () =
+  let frag = Url.Current.get_fragment () in
+  Url.decode_arguments frag
+
+let rec iter_on_sharp ~f x =
+  Js.Opt.iter (Dom_html.CoerceTo.element x) (fun e ->
+      if Js.to_bool (e##.classList##contains (Js.string "sharp")) then
+        f e);
+  match Js.Opt.to_option x##.nextSibling with
+  | None -> ()
+  | Some n -> iter_on_sharp ~f n
+
+let setup_share_button ~output =
+  do_by_id "btn-share" (fun e ->
+      e##.style##.display := Js.string "block";
+      e##.onclick :=
+        Dom_html.handler (fun _ ->
+            (* get all ocaml code *)
+            let code = ref [] in
+            Js.Opt.iter output##.firstChild
+              (iter_on_sharp ~f:(fun e ->
+                   code :=
+                     Js.Opt.case e##.textContent
+                       (fun () -> "")
+                       Js.to_string
+                     :: !code));
+            let code_encoded = String.concat "" (List.rev !code) in
+            let url, is_file =
+              match Url.Current.get () with
+              | Some (Url.Http url) ->
+                  (Url.Http { url with Url.hu_fragment = "" }, false)
+              | Some (Url.Https url) ->
+                  (Url.Https { url with Url.hu_fragment = "" }, false)
+              | Some (Url.File url) ->
+                  (Url.File { url with Url.fu_fragment = "" }, true)
+              | _ -> assert false
+            in
+            let frag =
+              let frags = parse_hash () in
+              let frags =
+                List.remove_assoc "code" frags
+                @ [ ("code", code_encoded) ]
+              in
+              Url.encode_arguments frags
+            in
+            let uri = Url.string_of_url url ^ "#" ^ frag in
+            let append_url str =
+              let dom =
+                Tyxml_js.Html.(
+                  p
+                    [
+                      txt "Share this url : ";
+                      a ~a:[ a_href str ] [ txt str ];
+                    ])
+              in
+              Dom.appendChild output (Tyxml_js.To_dom.of_element dom)
+            in
+            Lwt.async (fun () ->
+                Lwt.catch
+                  (fun () ->
+                    if is_file then
+                      failwith "Cannot shorten url with file scheme"
+                    else
+                      let uri =
+                        Printf.sprintf
+                          "http://is.gd/create.php?format=json&url=%s"
+                          (Url.urlencode uri)
+                      in
+                      Lwt.bind (Js_of_ocaml_lwt.Jsonp.call uri)
+                        (fun o ->
+                          let str = Js.to_string o##.shorturl in
+                          append_url str;
+                          Lwt.return_unit))
+                  (fun exn ->
+                    Format.eprintf
+                      "Could not generate short url. reason: %s@."
+                      (Printexc.to_string exn);
+                    append_url uri;
+                    Lwt.return_unit));
+            Js._false))
+
+let setup_js_preview () =
+  let ph = by_id "last-js" in
+  let runcode : string -> 'a = Js.Unsafe.global##.toplevelEval in
+  Js.Unsafe.global##.toplevelEval := fun bc ->
+  ph##.innerHTML := Js.string bc;
+  runcode bc
+
+let current_position = ref 0
+
+let highlight_location loc =
+  let x = ref 0 in
+  let output = by_id "output" in
+  let first =
+    Js.Opt.get
+      (output##.childNodes##item !current_position)
+      (fun _ -> assert false)
+  in
+  iter_on_sharp first ~f:(fun e ->
+      incr x;
+      let _file1, line1, col1 =
+        Location.get_pos_info loc.Location.loc_start
+      in
+      let _file2, line2, col2 =
+        Location.get_pos_info loc.Location.loc_end
+      in
+      if !x >= line1 && !x <= line2 then
+        let from_ = if !x = line1 then `Pos col1 else `Pos 0 in
+        let to_ = if !x = line2 then `Pos col2 else `Last in
+        Colorize.highlight from_ to_ e)
+
+let append colorize output cl s =
+  Dom.appendChild output
+    (Tyxml_js.To_dom.of_element (colorize ~a_class:cl s))
+
+module History = struct
+  let data = ref [| "" |]
+  let idx = ref 0
+
+  let get_storage () =
+    match Js.Optdef.to_option Dom_html.window##.localStorage with
+    | exception _ -> raise Not_found
+    | None -> raise Not_found
+    | Some t -> t
+
+  let setup () =
+    try
+      let s = get_storage () in
+      match Js.Opt.to_option (s##getItem (Js.string "history")) with
+      | None -> raise Not_found
+      | Some s ->
+          let a = Json.unsafe_input s in
+          data := a;
+          idx := Array.length a - 1
+    with _ -> ()
+
+  let push text =
+    let l = Array.length !data in
+    let n = Array.make (l + 1) "" in
+    !data.(l - 1) <- text;
+    Array.blit !data 0 n 0 l;
+    data := n;
+    idx := l;
+    try
+      let s = get_storage () in
+      let str = Json.output !data in
+      s##setItem (Js.string "history") str
+    with Not_found -> ()
+
+  let current text = !data.(!idx) <- text
+
+  let previous textbox =
+    if !idx > 0 then (
+      decr idx;
+      textbox##.value := Js.string !data.(!idx))
+
+  let next textbox =
+    if !idx < Array.length !data - 1 then (
+      incr idx;
+      textbox##.value := Js.string !data.(!idx))
+end
+
+let run _ =
+  let container = by_id "toplevel-container" in
+  let output = by_id "output" in
+  let textbox : 'a Js.t =
+    by_id_coerce "userinput" Dom_html.CoerceTo.textarea
+  in
+  let sharp_chan = open_out "/dev/null0" in
+  let sharp_ppf = Format.formatter_of_out_channel sharp_chan in
+  let caml_chan = open_out "/dev/null1" in
+  let caml_ppf = Format.formatter_of_out_channel caml_chan in
+  let execute () =
+    let content = Js.to_string textbox##.value##trim in
+    let content' =
+      let len = String.length content in
+      if
+        try
+          content <> ""
+          && content.[len - 1] <> ';'
+          && content.[len - 2] <> ';'
+        with _ -> true
+      then content ^ ";;"
+      else content
+    in
+    current_position := output##.childNodes##.length;
+    textbox##.value := Js.string "";
+    History.push content;
+    JsooTop.execute true ~pp_code:sharp_ppf ~highlight_location
+      caml_ppf content';
+    resize ~container ~textbox () >>= fun () ->
+    container##.scrollTop := container##.scrollHeight;
+    textbox##focus;
+    Lwt.return_unit
+  in
+  let history_down _e =
+    let txt = Js.to_string textbox##.value in
+    let pos = textbox##.selectionStart in
+    try
+      if String.length txt = pos then raise Not_found;
+      let _ = String.index_from txt pos '\n' in
+      Js._true
+    with Not_found ->
+      History.current txt;
+      History.next textbox;
+      Js._false
+  in
+  let history_up _e =
+    let txt = Js.to_string textbox##.value in
+    let pos = textbox##.selectionStart - 1 in
+    try
+      if pos < 0 then raise Not_found;
+      let _ = String.rindex_from txt pos '\n' in
+      Js._true
+    with Not_found ->
+      History.current txt;
+      History.previous textbox;
+      Js._false
+  in
+  let meta e =
+    let b = Js.to_bool in
+    b e##.ctrlKey || b e##.altKey || b e##.metaKey
+  in
+  let shift e = Js.to_bool e##.shiftKey in
+  (* setup handlers *)
+  textbox##.onkeyup :=
+    Dom_html.handler (fun _ ->
+        Lwt.async (resize ~container ~textbox);
+        Js._true);
+  textbox##.onchange :=
+    Dom_html.handler (fun _ ->
+        Lwt.async (resize ~container ~textbox);
+        Js._true);
+  textbox##.onkeydown :=
+    Dom_html.handler (fun e ->
+        match e##.keyCode with
+        | 13 when not (meta e || shift e) ->
+            Lwt.async execute;
+            Js._false
+        | 13 ->
+            Lwt.async (resize ~container ~textbox);
+            Js._true
+        | 09 ->
+            Indent.textarea textbox;
+            Js._false
+        | 76 when meta e ->
+            output##.innerHTML := Js.string "";
+            Js._true
+        | 75 when meta e ->
+            setup_toplevel ();
+            Js._false
+        | 38 -> history_up e
+        | 40 -> history_down e
+        | _ -> Js._true);
+  (Lwt.async_exception_hook :=
+     fun exc ->
+       Format.eprintf "exc during Lwt.async: %s@."
+         (Printexc.to_string exc);
+       match exc with
+       | Js_error.Exn e ->
+           let e = Js_error.to_error e in
+           Firebug.console##log e##.stack
+       | _ -> ());
+  Lwt.async (fun () ->
+      resize ~container ~textbox () >>= fun () ->
+      textbox##focus;
+      Lwt.return_unit);
+  Graphics_support.init
+    (by_id_coerce "test-canvas" Dom_html.CoerceTo.canvas);
+  Sys_js.set_channel_flusher caml_chan
+    (append Colorize.ocaml output "caml");
+  Sys_js.set_channel_flusher sharp_chan
+    (append Colorize.ocaml output "sharp");
+  Sys_js.set_channel_flusher stdout
+    (append Colorize.text output "stdout");
+  Sys_js.set_channel_flusher stderr
+    (append Colorize.text output "stderr");
+  let readline () =
+    Js.Opt.case
+      (Dom_html.window##prompt
+         (Js.string "The toplevel expects inputs:")
+         (Js.string ""))
+      (fun () -> "")
+      (fun s -> Js.to_string s ^ "\n")
+  in
+  Sys_js.set_channel_filler stdin readline;
+  setup_share_button ~output;
+  setup_examples ~container ~textbox;
+  setup_pseudo_fs ();
+  setup_toplevel ();
+  setup_js_preview ();
+  setup_printers ();
+  History.setup ();
+  textbox##.value := Js.string "";
+  (* Run initial code if any *)
+  try
+    let code = List.assoc "code" (parse_hash ()) in
+    textbox##.value := Js.string code;
+    Lwt.async execute
+  with
+  | Not_found -> ()
+  | exc ->
+      Firebug.console##log_3 (Js.string "exception")
+        (Js.string (Printexc.to_string exc))
+        exc
+
+let _ =
+  Dom_html.window##.onload
+  := Dom_html.handler (fun _ ->
+         run ();
+         Js._false)