clang-format: Normalize headers presentation

By using clang-format directives 'IncludeBlocks' and 'IncludeCategories'
headers are regrouped by categories:
1. "cmConfigure.h" which must be first
2. header matching current implementation file
3. standard language headers
4. CMake replacement ones
5. external  headers (i.e. #include directive with '<' and '>')
6. Qt headers
7. cmsys/* headers
8. cm_* headers
9. CMake headers (i.e. starting with 'cm[A-Z]')
10. all other headers

Fixes: #19674

1 files changed, 24 insertions, 0 deletions

diff --git a/.clang-format b/.clang-format
index 162c56d..0c7d6b0 100644
--- a/.clang-format
+++ b/.clang-format
@@ -18,4 +18,28 @@ ColumnLimit: 79
 IndentPPDirectives: AfterHash
 SortUsingDeclarations: false
 SpaceAfterTemplateKeyword: true
+IncludeBlocks: Regroup
+IncludeCategories:
+  - Regex:           '^[<"]cmConfigure\.h'
+    Priority:        -1
+  - Regex:           '^(<|")cm/'
+    Priority:        2
+  - Regex:           '^(<|")windows\.h'
+    Priority:        3
+  - Regex:           '^<sys/'
+    Priority:        5
+  - Regex:           '^(<|")Qt?[A-Z]'
+    Priority:        6
+  - Regex:           '^(<|")cmsys/'
+    Priority:        7
+  - Regex:           '^(<|")cm_'
+    Priority:        8
+  - Regex:           '^(<|")cm[A-Z][^.]+\.h'
+    Priority:        9
+  - Regex:           '^<[^.]+\.h'
+    Priority:        4
+  - Regex:           '^<'
+    Priority:        1
+  - Regex:           '.*'
+    Priority:        10
 ...