[Fixes #27632][Infrastructure] Added dotnet-format pre commit hook to…

… run dotnet-format on changed files

* Added pre-commit hook to format changed source files.
* Added code to build script to check dotnet-format tool installation.
* Configure default git hooks directory to .githooks to version and track hooks.

.githooks/pre-commit

@@ -0,0 +1,15 @@
+#!/bin/sh
+LC_ALL=C
+
+# Select files to format
+FILES=$(git show --name-only --pretty="")
+[ -z "$FILES" ] && exit 0
+
+# Format all selected files with dotnet-format
+echo "dotnet-format: Formatting changed source files.."
+echo "$FILES" | cat | xargs | sed -e 's/ /,/g' | xargs dotnet-format --folder . --include >/dev/null
+echo "dotnet-format: $(git diff --cached --numstat | wc -l) file(s) formatted."
+
+# Add files to staging
+echo "$FILES" | xargs git add
+exit 0

build.ps1

@@ -356,6 +356,24 @@ if (-not $foundJdk -and $RunBuild -and ($All -or $BuildJava) -and -not $NoBuildJ
     Write-Error "Could not find the JDK. Either run $PSScriptRoot\eng\scripts\InstallJdk.ps1 to install for this repo, or install the JDK globally on your machine (see $PSScriptRoot\docs\BuildFromSource.md for details)."
 }
 
+# Check dotnet-format is installed or not
+$dotnetFormat = Get-Command dotnet-format -ErrorAction Ignore -CommandType Application
+
+if($dotnetFormat)
+{
+    Write-Host -f Magenta "dotnet format tool is already installed."
+}
+else 
+{
+    Write-Host -f Magenta "Installing dotnet-format tool.."
+    & dotnet tool install -g dotnet-format
+}
+
+# We need to change default git hooks directory as .git folder is not tracked. And by default hooks are stored in .git/hooks folder.
+# So we are setting git hooks default directory to .githooks, so that we can track and version the git hooks.
+& git config core.hooksPath .githooks
+
+
 # Initialize global variables need to be set before the import of Arcade is imported
 $restore = $RunRestore