[vcpkg ci] upload diff from clang-format to artifacts (#15141)

* [vcpkg ci] upload diff from clang-format to artifacts

this allows people who do not have access to clang-format to format their code via diff

1 files changed, 20 insertions, 0 deletions

diff --git a/scripts/azure-pipelines/Create-FormatDiff.ps1 b/scripts/azure-pipelines/Create-FormatDiff.ps1
new file mode 100644
index 000000000..599118089
--- /dev/null
+++ b/scripts/azure-pipelines/Create-FormatDiff.ps1
@@ -0,0 +1,20 @@
+[CmdletBinding(PositionalBinding=$False)]
+Param(
+    [Parameter(Mandatory=$True)]
+    [String]$DiffFile
+)
+
+Start-Process -FilePath 'git' -ArgumentList 'diff' `
+    -NoNewWindow -Wait `
+    -RedirectStandardOutput $DiffFile
+if (0 -ne (Get-Item -LiteralPath $DiffFile).Length)
+{
+    $msg = @(
+        'The formatting of the files in the repo were not what we expected,',
+        'or the documentation was not regenerated.',
+        'Please access the diff from format.diff in the build artifacts,'
+        'and apply the patch with `git apply`'
+    )
+    Write-Error ($msg -join "`n")
+    throw
+}
\ No newline at end of file