clang-format: formalize some of the spacing rules

There are some spacing rules that we follow in the project and it makes
sense to formalize them:
* Ensure there is no space inserted after the logical not '!' operator.
* Ensure there is no space before the case statement's colon.
* Ensure there is no space before the first bracket '[' of an array.
* Ensure there is no space in empty blocks.

Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

.clang-format

@@ -118,11 +118,18 @@ PointerAlignment: Right
 # x = (int32)y;    not    x = (int32) y;
 SpaceAfterCStyleCast: false
 
+# No space is inserted after the logical not operator
+SpaceAfterLogicalNot: false
+
 # Insert spaces before and after assignment operators
 # int a = 5;    not    int a=5;
 # a += 42;             a+=42;
 SpaceBeforeAssignmentOperators: true
 
+# Spaces will be removed before case colon.
+# case 1: break;    not     case 1 : break;
+SpaceBeforeCaseColon: false
+
 # Put a space before opening parentheses only after control statement keywords.
 # void f() {
 #   if (true) {
@@ -134,6 +141,14 @@ SpaceBeforeParens: ControlStatements
 # Don't insert spaces inside empty '()'
 SpaceInEmptyParentheses: false
 
+# No space before first '[' in arrays
+# int a[5][5];     not      int a [5][5];
+SpaceBeforeSquareBrackets: false
+
+# No space will be inserted into {}
+# while (true) {}    not    while (true) { }
+SpaceInEmptyBlock: false
+
 # The number of spaces before trailing line comments (// - comments).
 # This does not affect trailing block comments (/* - comments).
 SpacesBeforeTrailingComments: 1