Restore dotnet-format local tool and add helper scripts

Format.cmd

@@ -0,0 +1,2 @@
+@echo off
+powershell -ExecutionPolicy ByPass -NoProfile -command "& """%~dp0eng\format.ps1""" %*"

dotnet-tools.json

@@ -1,6 +1,12 @@
 {
   "isRoot": true,
   "tools": {
+    "dotnet-format": {
+      "version": "6.0.240501",
+      "commands": [
+        "dotnet-format"
+      ]
+    },
     "powershell": {
       "version": "7.0.0",
       "commands": [

eng/format.ps1

@@ -0,0 +1,4 @@
+# Copyright (c) .NET Foundation and contributors. All rights reserved.
+# Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+dotnet tool run dotnet-format $Args

eng/format.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+# Copyright (c) .NET Foundation and contributors. All rights reserved.
+# Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+dotnet tool run dotnet-format $@

eng/test-build-correctness.ps1

@@ -65,7 +65,7 @@ try {
   # Verify the state of our generated syntax files
   Write-Host "Checking generated compiler files"
   Exec-Block { & (Join-Path $PSScriptRoot "generate-compiler-code.ps1") -test -configuration:$configuration }
-  Exec-Console dotnet "format whitespace Compilers.sln --include-generated --include src/Compilers/CSharp/Portable/Generated/ --include src/Compilers/VisualBasic/Portable/Generated/ --include src/ExpressionEvaluator/VisualBasic/Source/ResultProvider/Generated/ --verify-no-changes"
+  Exec-Console dotnet "tool run dotnet-format . --include-generated --include src/Compilers/CSharp/Portable/Generated/ src/Compilers/VisualBasic/Portable/Generated/ src/ExpressionEvaluator/VisualBasic/Source/ResultProvider/Generated/ --check -f"
   Write-Host ""
 
   exit 0

format.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+source="${BASH_SOURCE[0]}"
+
+# resolve $SOURCE until the file is no longer a symlink
+while [[ -h $source ]]; do
+  scriptroot="$( cd -P "$( dirname "$source" )" && pwd )"
+  source="$(readlink "$source")"
+
+  # if $source was a relative symlink, we need to resolve it relative to the path where the
+  # symlink file was located
+  [[ $source != /* ]] && source="$scriptroot/$source"
+done
+
+scriptroot="$( cd -P "$( dirname "$source" )" && pwd )"
+"$scriptroot/eng/format.sh" $@