[clang] [emacs][clang-format] Add elisp API for clang-format on git diffs (PR #112792)

[Campbell Barton via cfe-commits]

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@@ -205,14 +288,60 @@ uses the function `buffer-file-name'."
       (delete-file temp-file)
       (when (buffer-name temp-buffer) (kill-buffer temp-buffer)))))
 
+;;;###autoload
+(defun clang-format-git-diffs (&optional style assume-file-name)
+  "The same as 'clang-format-buffer' but only operates on the git
+diffs from HEAD in the buffer. If no STYLE is given uses
+`clang-format-style'. Use ASSUME-FILE-NAME to locate a style config
+file. If no ASSUME-FILE-NAME is given uses the function
+`buffer-file-name'."
+  (interactive)
+  (let ((tmpfile-git-head
+         (clang-format--git-diffs-get-git-head-file))
+        (tmpfile-curbuf (make-temp-file "clang-format-git-tmp")))
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ideasman42 wrote:

It looks like this temporary file isn't removed either.

https://github.com/llvm/llvm-project/pull/112792