Temporarily rename swift-format to swift-syntax-format

This is colliding with an implicit frontend action. Temporarily
rename this while we reconcile what to call this.

tools/swift-syntax-format/swift-syntax-format.cpp

@@ -0,0 +1,93 @@
+//===--- swift-syntax-test.cpp - Reflection Syntax testing application ----===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+//
+// This is a host-side tool to format Swift code.
+//
+//===----------------------------------------------------------------------===//
+
+
+#include "swift/Basic/LangOptions.h"
+#include "swift/Basic/SourceManager.h"
+#include "swift/AST/DiagnosticEngine.h"
+#include "swift/AST/DiagnosticsFrontend.h"
+#include "swift/Frontend/Frontend.h"
+#include "swift/Frontend/PrintingDiagnosticConsumer.h"
+#include "swift/Syntax/Format.h"
+#include "swift/Syntax/LegacyASTTransformer.h"
+#include "swift/Subsystems.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/CommandLine.h"
+
+using namespace swift;
+using namespace swift::syntax;
+using llvm::ArrayRef;
+using llvm::StringRef;
+
+int doFormat(ArrayRef<StringRef> InputFiles) {
+
+  for (auto InputFilename : InputFiles) {
+    CompilerInvocation Invocation;
+    Invocation.addInputFilename(InputFilename);
+    Invocation.setModuleName("Format");
+    CompilerInstance Instance;
+
+    auto &SourceMgr = Instance.getSourceMgr();
+    auto &Diags = Instance.getDiags();
+
+    PrintingDiagnosticConsumer DiagPrinter;
+    Instance.addDiagnosticConsumer(&DiagPrinter);
+    if (Instance.setup(Invocation)) {
+      return EXIT_FAILURE;
+    }
+
+    // First, parse the file normally and get the regular old AST.
+    Instance.performParseOnly();
+
+    auto BufferID = Instance.getInputBufferIDs().back();
+    auto &SF = Instance.getMainModule()
+      ->getMainSourceFile(SourceFileKind::Main);
+
+    auto Buffer = llvm::MemoryBuffer::getFile(InputFilename);
+    if (!Buffer) {
+      Diags.diagnose(SourceLoc(), diag::cannot_open_file,
+                     InputFilename, Buffer.getError().message());
+      return EXIT_FAILURE;
+    }
+
+    auto Tokens = tokenizeWithTrivia(Invocation.getLangOptions(),
+                                     SourceMgr, BufferID);
+
+    SmallVector<Decl *, 256> FileDecls;
+    SF.getTopLevelDecls(FileDecls);
+    sema::Semantics Sema;
+    for (auto *Decl : FileDecls) {
+      if (Decl->escapedFromIfConfig()) {
+        continue;
+      }
+      auto NewNode = transformAST(ASTNode(Decl), Sema, SourceMgr,
+                                  BufferID, Tokens);
+      if (NewNode.hasValue()) {
+        auto Reformatted = format(NewNode.getValue());
+        Reformatted.print(llvm::outs());
+      }
+    }
+  }
+  return EXIT_SUCCESS;
+}
+
+int main(int argc, char *argv[]) {
+  llvm::cl::ParseCommandLineOptions(argc, argv,
+                                    "A tool to format Swift code\n");
+
+  return doFormat({"/Users/david/test.swift"});
+}