feat(export): update html render

tests/html.rs

@@ -1,17 +1,17 @@
 extern crate orgize;
 
-use orgize::export::HtmlRender;
-use std::io::Cursor;
+use orgize::Org;
 
 macro_rules! html_test {
     ($name:ident, $content:expr, $expected:expr) => {
         #[test]
         fn $name() {
-            let mut cursor = Cursor::new(Vec::new());
-            let mut render = HtmlRender::default(&mut cursor, $content);
-            render.render().expect("render error");
-            let s = String::from_utf8(cursor.into_inner()).expect("invalid utf-8");
-            assert_eq!(s, $expected);
+            let mut writer = Vec::new();
+            let mut org = Org::new($content);
+            org.parse();
+            org.html_default(&mut writer).unwrap();
+            let string = String::from_utf8(writer).unwrap();
+            assert_eq!(string, $expected);
         }
     };
 }
@@ -19,7 +19,7 @@ macro_rules! html_test {
 html_test!(
     emphasis,
     "*bold*, /italic/,_underlined_, =verbatim= and ~code~",
-    "<section><p><b>bold</b>, <i>italic</i>,<u>underlined</u>, <code>verbatim</code> and <code>code</code></p></section>"
+    "<main><section><p><b>bold</b>, <i>italic</i>,<u>underlined</u>, <code>verbatim</code> and <code>code</code></p></section></main>"
 );
 
 html_test!(
@@ -32,14 +32,14 @@ _Section 2_
 /Section 3/
 * Title 4
 =Section 4="#,
-    "<h1>Title 1</h1>\
+    "<main><h1>Title 1</h1>\
      <section><p><b>Section 1</b></p></section>\
      <h2>Title 2</h2>\
      <section><p><u>Section 2</u></p></section>\
      <h1>Title 3</h1>\
      <section><p><i>Section 3</i></p></section>\
      <h1>Title 4</h1>\
-     <section><p><code>Section 4</code></p></section>"
+     <section><p><code>Section 4</code></p></section></main>"
 );
 
 html_test!(
@@ -53,15 +53,15 @@ html_test!(
   - 4
 
 + 5"#,
-    "<section><ul>\
+    "<main><section><ul>\
      <li><p>1</p></li>\
      <li><p>2</p><ul><li><p>3</p></li><li><p>4</p></li></ul></li>\
      <li><p>5</p></li>\
-     </ul></section>"
+     </ul></section></main>"
 );
 
 html_test!(
     snippet,
     "@@html:<del>@@delete this@@html:</del>@@",
-    "<section><p><del>delete this</del></p></section>"
+    "<main><section><p><del>delete this</del></p></section></main>"
 );