Add a script and target to run dartfix

Change-Id: I68df635359b898ef4b6054292f6523d81f46448a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/121149
Reviewed-by: Paul Berry <paulberry@google.com>
Reviewed-by: Alexander Thomas <athom@google.com>
Commit-Queue: Keerti Parthasarathy <keertip@google.com>

BUILD.gn

@@ -116,6 +116,12 @@ group("dartfmt") {
   ]
 }
 
+group("dartfix") {
+  deps = [
+    "utils/dartfix",
+  ]
+}
+
 group("analysis_server") {
   deps = [
     "utils/analysis_server",

sdk/bin/dartfix

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+# Copyright (c) 2013, 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.
+
+# Run dartfix.dart on the Dart VM. This script assumes the Dart SDK's
+# directory structure.
+
+function follow_links() {
+  file="$1"
+  while [ -h "$file" ]; do
+    # On Mac OS, readlink -f doesn't work.
+    file="$(readlink "$file")"
+  done
+  echo "$file"
+}
+
+# Unlike $0, $BASH_SOURCE points to the absolute path of this file.
+PROG_NAME="$(follow_links "$BASH_SOURCE")"
+
+# Handle the case where dart-sdk/bin has been symlinked to.
+BIN_DIR="$(cd "${PROG_NAME%/*}" ; pwd -P)"
+
+SNAPSHOT="$BIN_DIR/snapshots/dartfix.dart.snapshot"
+
+# We are running the snapshot in the built SDK.
+DART="$BIN_DIR/dart"
+exec "$DART" "$SNAPSHOT" "$@"

sdk/bin/dartfix.bat

@@ -0,0 +1,44 @@
+@echo off
+REM Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+REM for details. All rights reserved. Use of this source code is governed by a
+REM BSD-style license that can be found in the LICENSE file.
+
+setlocal
+rem Handle the case where dart-sdk/bin has been symlinked to.
+set DIR_NAME_WITH_SLASH=%~dp0
+set DIR_NAME=%DIR_NAME_WITH_SLASH:~0,-1%%
+call :follow_links "%DIR_NAME%", RETURNED_BIN_DIR
+rem Get rid of surrounding quotes.
+for %%i in ("%RETURNED_BIN_DIR%") do set BIN_DIR=%%~fi
+
+set DART=%BIN_DIR%\dart
+set SNAPSHOT=%BIN_DIR%\snapshots\dartfix.dart.snapshot
+
+"%DART%" "%SNAPSHOT%" %*
+
+endlocal
+
+exit /b %errorlevel%
+
+rem Follow the symbolic links (junctions points) using `dir to determine the
+rem canonical path. Output with a link looks something like this
+rem
+rem 01/03/2013  10:11 PM    <JUNCTION>     abc def
+rem [c:\dart_bleeding\dart-repo.9\dart\out\ReleaseIA32\dart-sdk]
+rem
+rem So in the output of 'dir /a:l "targetdir"' we are looking for a filename
+rem surrounded by right angle bracket and left square bracket. Once we get
+rem the filename, which is name of the link, we recursively follow that.
+:follow_links
+setlocal
+for %%i in (%1) do set result=%%~fi
+set current=
+for /f "usebackq tokens=2 delims=[]" %%i in (`dir /a:l "%~dp1" 2^>nul ^
+                                             ^| find ">     %~n1 [" 2^>nul`) do (
+  set current=%%i
+)
+if not "%current%"=="" call :follow_links "%current%", result
+endlocal & set %~2=%result%
+goto :eof
+
+:end

sdk_nnbd/bin/dartfix

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+# Copyright (c) 2013, 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.
+
+# Run dartfix.dart on the Dart VM. This script assumes the Dart SDK's
+# directory structure.
+
+function follow_links() {
+  file="$1"
+  while [ -h "$file" ]; do
+    # On Mac OS, readlink -f doesn't work.
+    file="$(readlink "$file")"
+  done
+  echo "$file"
+}
+
+# Unlike $0, $BASH_SOURCE points to the absolute path of this file.
+PROG_NAME="$(follow_links "$BASH_SOURCE")"
+
+# Handle the case where dart-sdk/bin has been symlinked to.
+BIN_DIR="$(cd "${PROG_NAME%/*}" ; pwd -P)"
+
+SNAPSHOT="$BIN_DIR/snapshots/dartfix.dart.snapshot"
+
+# We are running the snapshot in the built SDK.
+DART="$BIN_DIR/dart"
+exec "$DART" "$SNAPSHOT" "$@"

sdk_nnbd/bin/dartfix.bat

@@ -0,0 +1,44 @@
+@echo off
+REM Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+REM for details. All rights reserved. Use of this source code is governed by a
+REM BSD-style license that can be found in the LICENSE file.
+
+setlocal
+rem Handle the case where dart-sdk/bin has been symlinked to.
+set DIR_NAME_WITH_SLASH=%~dp0
+set DIR_NAME=%DIR_NAME_WITH_SLASH:~0,-1%%
+call :follow_links "%DIR_NAME%", RETURNED_BIN_DIR
+rem Get rid of surrounding quotes.
+for %%i in ("%RETURNED_BIN_DIR%") do set BIN_DIR=%%~fi
+
+set DART=%BIN_DIR%\dart
+set SNAPSHOT=%BIN_DIR%\snapshots\dartfix.dart.snapshot
+
+"%DART%" "%SNAPSHOT%" %*
+
+endlocal
+
+exit /b %errorlevel%
+
+rem Follow the symbolic links (junctions points) using `dir to determine the
+rem canonical path. Output with a link looks something like this
+rem
+rem 01/03/2013  10:11 PM    <JUNCTION>     abc def
+rem [c:\dart_bleeding\dart-repo.9\dart\out\ReleaseIA32\dart-sdk]
+rem
+rem So in the output of 'dir /a:l "targetdir"' we are looking for a filename
+rem surrounded by right angle bracket and left square bracket. Once we get
+rem the filename, which is name of the link, we recursively follow that.
+:follow_links
+setlocal
+for %%i in (%1) do set result=%%~fi
+set current=
+for /f "usebackq tokens=2 delims=[]" %%i in (`dir /a:l "%~dp1" 2^>nul ^
+                                             ^| find ">     %~n1 [" 2^>nul`) do (
+  set current=%%i
+)
+if not "%current%"=="" call :follow_links "%current%", result
+endlocal & set %~2=%result%
+goto :eof
+
+:end

utils/dartfix/BUILD.gn

@@ -0,0 +1,10 @@
+# Copyright (c) 2019, 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("../application_snapshot.gni")
+
+application_snapshot("dartfix") {
+  main_dart = "../../pkg/dartfix/bin/dartfix.dart"
+  training_args = [ "--help" ]
+}