Fossil

static void fileedit_ajax_error(int httpCode, const char * zFmt, ...){
  Blob msg = empty_blob;
  Blob content = empty_blob;
  va_list vargs;
  va_start(vargs,zFmt);
  blob_vappendf(&msg, zFmt, vargs);
  va_end(vargs);
  blob_appendf(&content,"{\"error\":\"%j\"}", blob_str(&msg));
  blob_reset(&msg);
  cgi_set_content(&content);
  cgi_set_status(httpCode, "Error");
  cgi_set_content_type("application/json");
}

/*

  if(zCi!=0){
    char * zCiFull = 0;
    int vid = 0;
    if(0==fileedit_ajax_setup_filerev(zCi, &zCiFull, &vid, 0, 0)){
      /* Error already reported */
      return;
    }
    CX("{\"checkin\":\"%j\","
       "\"editableFiles\":[", zCiFull);
    blob_append_sql(&sql, "SELECT filename FROM files_of_checkin(%Q) "
                    "ORDER BY filename %s",
                    zCiFull, filename_collation());
    db_prepare_blob(&q, &sql);
    while( SQLITE_ROW==db_step(&q) ){
      const char * zFilename = db_column_text(&q, 0);
      if(fileedit_is_editable(zFilename)){
        if(i++){
          CX(",");
        }
        CX("\"%j\"", zFilename);
      }
    }
    db_finalize(&q);
    CX("]}");
  }else if(P("leaves")!=0){
    blob_append(&sql, timeline_query_for_tty(), -1);
    blob_append_sql(&sql, " AND blob.rid IN (SElECT rid FROM leaf "
                    "WHERE NOT EXISTS("
                    "SELECT 1 from tagxref WHERE tagid=%d AND "
                    "tagtype>0 AND rid=leaf.rid"
                    ")) "
                    "ORDER BY mtime DESC", TAG_CLOSED);
    db_prepare_blob(&q, &sql);
    CX("[");
    while( SQLITE_ROW==db_step(&q) ){
      if(i++){
        CX(",");
      }
      CX("{");
      CX("\"checkin\":\"%j\",", db_column_text(&q, 1));
      CX("\"timestamp\":\"%j\",", db_column_text(&q, 2));
      CX("\"branch\":\"%j\"", db_column_text(&q, 7));
      CX("}");
    }
    CX("]");
    db_finalize(&q);
  }else{
    fileedit_ajax_error(500, "Unhandled URL argument.");
  }

    fileedit_ajax_error(500,"%b",&err);
    goto end_cleanup;
  }
  assert(newVid>0);
  zNewUuid = rid_to_uuid(newVid);
  cgi_set_content_type("application/json");
  CX("{");
  CX("\"uuid\":\"%j\",", zNewUuid);
  CX("\"dryRun\": %s,",
     (CIMINI_DRY_RUN & cimi.flags) ? "true" : "false");
  CX("\"manifest\": \"%j\"", blob_str(&manifest));
  CX("}");
  db_end_transaction(0/*noting that dry-run mode will have already
                      ** set this to rollback mode. */);
end_cleanup:
  fossil_free(zNewUuid);
  blob_reset(&err);
  blob_reset(&manifest);

    ** blob, and/or switch to tab #0, where the file selector
    ** lives... */
    blob_appendf(&endScript,
                 "window.addEventListener('load',");
    if(zRev && zFilename){
      assert(0==blob_size(&err));
      blob_appendf(&endScript,
                   "()=>fossil.page.loadFile(\"%j\",'%j')",
                   zFilename, cimi.zParentUuid);
    }else{
      blob_appendf(&endScript,"function(){");
      if(blob_size(&err)>0){
        blob_appendf(&endScript,
                     "fossil.error(\"%j\");\n",
                     blob_str(&err));
      }
      blob_appendf(&endScript,
                   "fossil.page.tabs.switchToTab(0);\n");
      blob_appendf(&endScript,"}");
    }
    blob_appendf(&endScript,", false);\n");

  static int once = 0;
  if(0==once++){
    /* Set up the generic/app-agnostic parts of window.fossil
    ** which require C-level state... */
    style_emit_script_tag(0,0);
    CX("(function(){\n"
       "if(!window.fossil) window.fossil={};\n"
       "window.fossil.version = \"%j\";\n"
    /* fossil.rootPath is the top-most CGI/server path,
    ** including a trailing slash. */
       "window.fossil.rootPath = \"%j\"+'/';\n",
       get_version(), g.zTop);
    /* fossil.config = {...various config-level options...} */
    CX("window.fossil.config = {"
       "hashDigits: %d, hashDigitsUrl: %d"
       "};\n", hash_digits(0), hash_digits(1));
    /*
    ** fossil.page holds info about the current page. This is also