Implement powershell script which enables devs to clang-format modified source files

format_sources.ps1

@@ -0,0 +1,50 @@
+param (
+  [switch]$all = $false
+)
+
+if(!(Get-Command "git" -ErrorAction SilentlyContinue)) {
+  throw "You need to have a git in path to be able to format only the dirty files!"
+}
+
+$clangFormat = "clang-format.exe"
+if(!(Get-Command $clangFormat -ErrorAction SilentlyContinue)) {
+    Write-Information "Can't find clang-format.exe in %PATH%, trying to use %VCINSTALLDIR%..."
+    $clangFormat="$env:VCINSTALLDIR\Tools\Llvm\bin\clang-format.exe"
+    if(!(Test-Path -Path $clangFormat -PathType leaf)) {
+      throw "Can't find clang-format.exe executable. Make sure you either have it in %PATH% or run this script from vcvars.bat!"
+    }
+}
+
+$sourceExtensions = New-Object System.Collections.Generic.HashSet[string]
+$sourceExtensions.Add(".cpp") | Out-Null
+$sourceExtensions.Add(".h")   | Out-Null
+
+function Get-Dirty-Files-From-Git() {
+  $staged    = & git diff --name-only --diff-filter=d --cached
+  $unstaged  = & git ls-files -m
+  $untracked = & git ls-files --others --exclude-standard
+  $result = New-Object System.Collections.Generic.List[string]
+  $staged, $unstaged, $untracked | % {
+    $_.Split(" ") | 
+      where {$sourceExtensions.Contains((Get-Item $_).Extension)} | 
+      foreach {$result.Add($_)}
+  } 
+  return $result
+}
+
+if($all) { 
+  $filesToFormat = 
+    Get-ChildItem -Recurse -File src | 
+    Resolve-Path -Relative |
+    where {$sourceExtensions.Contains((Get-Item $_).Extension)}
+}
+else {
+  $filesToFormat = Get-Dirty-Files-From-Git
+}
+
+$filesToFormat | % {
+  Write-Host "Formatting $_"
+  & $clangFormat -i -style=file -fallback-style=none $_ 2>&1
+}
+
+Write-Host "Done!"