Fossil

** window.fossil if it's not already defined, and may set some
** properties on it.
*/
void style_emit_script_tag(int phase){
  static int once = 0;
  if(0==phase){
    CX("<script nonce='%s'>", style_nonce());
    if(0==once){
      once = 1;
      /* Set up the generic/app-agnostic parts of window.fossil */
      CX("(function(){\n");
      CX("\nif(!window.fossil) window.fossil={};\n");
      CX("window.fossil.version = '%j';\n", get_version());
      /* fossil.rootPath is the top-most CGI/server path,
         including a trailing slash. */
      CX("window.fossil.rootPath = '%j'+'/';\n", g.zTop);
      /*
      ** fossil.page holds info about the current page. This is
      ** also where the current page "should" store any of its
      ** own page-specific state.
      */
      CX("window.fossil.page = {"
         "page:'%T'"
         "};\n", g.zPath);
      CX("%s\n", builtin_text("fossil.bootstrap.js"));
      CX("})();\n");
    }
  }else{
    CX("</script>\n");
  }
}


/*
** The *FIRST* time this is called, it emits a JS script block,
** including tags, which defines window.fossil.fetch(), which works
** similarly (not identically) to the not-quite-ubiquitous global
** fetch(). It calls style_emit_script_tag(), which may inject
** other JS bootstrapping bits.
**
** JS usages:
**
** fossilFetch( URI, onLoadCallback );
**
** fossilFetch( URI, optionsObject );
**
** Noting that URI must be relative to the top of the repository and
** should not start with a slash (if it does, it is stripped). It gets
** the equivalent of "%R/" prepended to it.
**
** The optionsObject may be an onload callback or an object with any
** of these properties:
**
** - onload: callback(responseData) (default = output response to
**   the console).
**
** - onerror: callback(XHR onload event | exception)
**   (default = output event or exception to the console).
**
** - method: 'POST' | 'GET' (default = 'GET')
**
** - payload: anything acceptable by XHR2.send(ARG) (DOMString,
**   Document, FormData, Blob, File, ArrayBuffer), or a plain object
**   or array, either of which gets JSON.stringify()'d. If set then
**   the method is automatically set to 'POST'. If an object/array is
**   converted to JSON, the content-type is set to 'application/json'.
**   By default XHR2 will set the content type based on the payload
**   type.
**
** - contentType: Optional request content type when POSTing. Ignored
**   if the method is not 'POST'.
**
** - responseType: optional string. One of ("text", "arraybuffer",
**   "blob", or "document") (as specified by XHR2). Default = "text".
**   As an extension, it supports "json", which tells it that the
**   response is expected to be text and that it should be
**   JSON.parse()d before passing it on to the onload() callback. In
**   this case, if the payload property is an object/array.
**
** - urlParams: string|object. If a string, it is assumed to be a
**   URI-encoded list of params in the form "key1=val1&key2=val2...",
**   with NO leading '?'.  If it is an object, all of its properties
**   get converted to that form. Either way, the parameters get
**   appended to the URL.
**
** Returns this object, noting that the XHR request is still in
** transit (or has yet to be sent) when that happens.
*/
void style_emit_script_fetch(){
  static int once = 0;
  if(0==once){
    once = 1;
    style_emit_script_tag(0);
    CX("%s", builtin_text("fossil.fetch.js"));
    style_emit_script_tag(1);
  }
}