scripts: Add Format-Build-Macro to format build!/generate! blocks

scripts/Format-Build-Macro.ps1

@@ -0,0 +1,24 @@
+<#
+  .SYNOPSIS
+  Autoformats `build!` macros across `build.rs` scripts,
+  and `generate!` in bindings' `main.rs`.
+#>
+
+function Format-Macro {
+  param (
+    $File,
+    $Pattern
+  )
+
+  $shim = 'use format_build_macro::{'
+
+  $fmtResult = ((Get-Content -Raw $File).replace($Pattern, $shim) | & rustfmt) -join "`n"
+  # Some build macros contain a single item, where curly braces are removed. Those
+  # cannot easily be formatted yet.
+  if ($fmtResult.Contains($shim)) {
+    $fmtResult.replace($shim, $Pattern) | Set-Content $File
+  }
+}
+
+gci -r -fi build.rs | % { Format-Macro $_ 'windows::build! {' }
+Format-Macro (gi './crates/bindings/src/main.rs') 'let tokens = windows_macros::generate! {'