clang-format commit hook failed when using <filename>.h

[mlouielu]

Root cause:

Using temp file will mess up clang-format IncludeCategories rules for .h

Description:

In clang-format, IncludeCategories will automatically set the filename.h to the highest priority, which mean it will put it at the first of the include block:

The main header for a source file automatically gets category 0. so that it is generally kept at the beginning of the #includes link

But, our hook using the temp file to compare with the source file, causing this rule not work, hence given a no-fix loop for this situation:

Report by the clang-format

$ clang-format this_is_the_actual_filename.c
#ifdef FOOBAR
#include "this_is_the_actual_filename.h"
#include "xxx.h"
#include "xxx.h"
#include "xxx.h"

 #include <xxx.h>
 #include <xxx.h>

Report by the hook

--- .merge_file_Zzz17X	2019-09-26 21:39:09.606926346 +0800
+++ /tmp/.merge_file_Zzz17X.I2ISWZ	2019-09-26 21:39:09.650259682 +0800
@@ -1,8 +1,8 @@
 #ifdef FOOBAR
-#include "this_is_the_actual_filename.h"
 #include "xxx.h"
 #include "xxx.h"
 #include "xxx.h"
+#include "this_is_the_actual_filename.h"
 
 #include <xxx.h>
 #include <xxx.h>