Deprecate IO operations

Author: scottt2

lib/src/inspector.dart

@@ -1,3 +1,4 @@
+import 'package:traindown/src/formatter.dart';
 import 'package:traindown/src/metadata.dart';
 import 'package:traindown/src/movement.dart';
 import 'package:traindown/src/performance.dart';
@@ -28,6 +29,22 @@ class Inspector {
     TraindownScope.performance: 2
   };
 
+  /// Export all Sessions as a single Traindown string. Good for dumping
+  /// and sharing.
+  ///
+  /// For details on the optional parameters, see Formatter.
+  String export(
+      {String indenter = '  ',
+      String linebreaker = '\r\n',
+      String spacer = ' '}) {
+    Formatter formatter =
+        Formatter(indenter: indenter, linebreaker: linebreaker, spacer: spacer);
+    StringBuffer buffer = StringBuffer();
+    sessions.forEach((s) => buffer
+        .write('${formatter.format(s.tokens)}${formatter.linebreaker * 2}'));
+    return buffer.toString().trim();
+  }
+
   /// Map keyed by string that contains all seen values of the given key.
   Map<String, Set<String>> metadataByKey(
       [TraindownScope scope = TraindownScope.session]) {

lib/src/session_io.dart

@@ -10,6 +10,3 @@ export "src/presenters/html_presenter.dart";
 export "src/presenters/json_presenter.dart";
 export "src/session.dart";
 export "src/token.dart";
-
-/// To enable a JS target, we conditionally add the IO bits here.
-export "" if (dart.library.io) "src/session_io.dart";

lib/traindown.dart

@@ -3,8 +3,8 @@ import 'dart:io';
 import 'package:test/test.dart';
 
 import 'package:traindown/src/inspector.dart';
+import 'package:traindown/src/parser.dart';
 import 'package:traindown/src/session.dart';
-import 'package:traindown/src/session_io.dart';
 import 'package:traindown/src/token.dart';
 
 void main() {
@@ -23,8 +23,12 @@ void main() {
   });
 
   group('metadataByKey', () {
-    List<File> files = [File('./example/example.traindown')];
-    Inspector subject = SessionIO.inspectorFromFiles(files);
+    File file = File("./example/example.traindown");
+    String src = file.readAsStringSync();
+    Parser parser = Parser(src);
+    Session session = Session(parser.tokens());
+
+    Inspector subject = Inspector([session]);
 
     Map<String, Set<String>> expected = {
       "bw": {"230"},
@@ -62,8 +66,13 @@ void main() {
 
   group('movementNames', () {
     test('Basic use', () {
-      List<File> files = [File('./example/example.traindown')];
-      Inspector subject = SessionIO.inspectorFromFiles(files);
+      File file = File("./example/example.traindown");
+      String src = file.readAsStringSync();
+      Parser parser = Parser(src);
+      Session session = Session(parser.tokens());
+
+      Inspector subject = Inspector([session]);
+
       List<String> movementNames = subject.movementNames;
       expect(movementNames.length, 5);
       expect(movementNames[0], equals('movement 1'));