Move writeOutline() and writeProgram() out of KernelTarget.

pkg/front_end/lib/src/fasta/kernel/utils.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+import 'dart:async';
+import 'dart:io';
+
+import 'package:front_end/src/fasta/ticker.dart';
 import 'package:front_end/src/scanner/token.dart' show Token;
 import 'package:kernel/ast.dart';
+import 'package:kernel/binary/ast_to_binary.dart';
 import 'package:kernel/text/ast_to_text.dart';
 
 /// A null-aware alternative to `token.offset`.  If [token] is `null`, returns
 /// `TreeNode.noOffset`.
 int offsetForToken(Token token) =>
     token == null ? TreeNode.noOffset : token.offset;
 
 /// Print the given [program].  Do nothing if it is `null`.
 void printProgramText(Program program) {
   if (program == null) return;
   StringBuffer sb = new StringBuffer();
   for (Library library in program.libraries) {
     Printer printer = new Printer(sb);
     printer.writeLibraryFile(library);
   }
   print(sb);
 }
+
+Future<Program> writeProgramToFileUri(Ticker ticker, Uri uri, Program program,

[Siggi Cherem (dart-lang), 2017/05/17 22:01:35]

a couple minor suggestions: 
- rename to writeProgramToFile (no need to say to FileUri)
- reorder the args to match the order in which they are mentioned by the
function name, I think it will match users expectations more

    writeProgramToFile(program, uri, ...);


- no need to do with this CL, but it would be nice to make ticker optional as
well, even better not expect the ticker here but use the ticker only in the
context where this is called instead. In a related note I'd drop the
"isFullProgram" argument entirely as well, since it's only used for printing a
message

[scheglov, 2017/05/17 22:16:04]

Good suggestions.
Done.

+    {bool isFullProgram}) async {
+  File output = new File.fromUri(uri);
+  IOSink sink = output.openWrite();
+  try {
+    new BinaryPrinter(sink).writeProgramFile(program);
+    program.unbindCanonicalNames();
+  } finally {
+    await sink.close();
+  }
+  if (isFullProgram) {
+    ticker.logMs("Wrote program to ${uri.toFilePath()}");
+  } else {
+    ticker.logMs("Wrote outline to ${uri.toFilePath()}");
+  }
+  return null;
+}