Add objc clang format (#7677)

Co-authored-by: Nicolas Hug <contact@nicolas-hug.com>
Co-authored-by: Philip Meier <github.pmeier@posteo.de>

.clang-format

@@ -60,9 +60,6 @@ MacroBlockBegin: ''
 MacroBlockEnd:   ''
 MaxEmptyLinesToKeep: 1
 NamespaceIndentation: None
-ObjCBlockIndentWidth: 2
-ObjCSpaceAfterProperty: false
-ObjCSpaceBeforeProtocolList: false
 PenaltyBreakBeforeFirstCallParameter: 1
 PenaltyBreakComment: 300
 PenaltyBreakFirstLessLess: 120
@@ -85,4 +82,11 @@ SpacesInSquareBrackets: false
 Standard:        Cpp11
 TabWidth:        8
 UseTab:          Never
+---
+Language: ObjC
+ColumnLimit: 120
+AlignAfterOpenBracket: Align
+ObjCBlockIndentWidth: 2
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: false
 ...

.pre-commit-config.yaml

@@ -6,6 +6,8 @@ repos:
       - id: check-toml
       - id: check-yaml
         exclude: packaging/.*
+        args:
+          - --allow-multiple-documents
       - id: mixed-line-ending
         args: [--fix=lf]
       - id: end-of-file-fixer