pre-commit/ClangFormat: enable formatting of supported files (#2787)

* .clang-format: add settings for JavaScript (.js), JSON (.json) and Objective-C (.m) files
* enable pre-commit to run all .clang-format supported files

.clang-format

@@ -1,12 +1,15 @@
 ---
-Language:        Cpp
-BasedOnStyle:  LLVM
+BasedOnStyle: LLVM
+IndentWidth: 4
+
+---
+Language: Cpp
 AccessModifierOffset: -4
 AlignConsecutiveMacros:
-  Enabled:         true
+  Enabled: true
   AcrossEmptyLines: true
-  AcrossComments:  true
-  PadOperators:    true
+  AcrossComments: true
+  PadOperators: true
 AlignEscapedNewlines: Left
 AllowShortFunctionsOnASingleLine: InlineOnly
 AlwaysBreakTemplateDeclarations: Yes
@@ -17,9 +20,16 @@ ForEachMacros:
   - BOOST_FOREACH
 IfMacros:
   - SORT_DEBUG
-IndentWidth:     4
 MacroBlockBegin: GNO_BEGIN
-MacroBlockEnd:   GNO_END
-SortIncludes:    Never
-...
+MacroBlockEnd: GNO_END
+SortIncludes: Never
+
+---
+Language: ObjC
 
+---
+Language: JavaScript
+
+---
+Language: Json
+...

.pre-commit-config.yaml

@@ -29,3 +29,8 @@ repos:
     rev: v15.0.6
     hooks:
       - id: clang-format
+        types_or: [c, c++, javascript, json, objective-c]
+        exclude: |
+          (?x)^(
+                man/jquery.fixedheadertable.min.js
+          )