CONTRIBUTING: Do not indent case labels nor blocks

Fixes: #188

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Norbert Pocs <npocs@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

.clang-format

@@ -1,3 +1,4 @@
+---
 # https://clang.llvm.org/docs/ClangFormatStyleOptions.html
 BasedOnStyle: LLVM
 IndentWidth: 4
@@ -13,6 +14,7 @@ BraceWrapping:
     BeforeElse: false
     BeforeWhile: false
 IndentCaseLabels: false
+IndentCaseBlocks: false
 ColumnLimit: 80
 AlignAfterOpenBracket: Align
 AllowAllParametersOfDeclarationOnNextLine: false

CONTRIBUTING.md

@@ -478,6 +478,45 @@ Macros like `STATUS_NOT_OK_RETURN` that change control flow (return/goto/etc)
 from within the macro are considered bad, because they look like function calls
 that never change control flow. Please do not introduce them.
 
+### Switch/case indentation
+
+The `case` should not be indented to avoid wasting too much horizontal space.
+When the case block contains local variables that need to be wrapped in braces,
+they should not be indented again either.
+
+Good example:
+
+    switch (x) {
+    case 0:
+        do_stuff();
+        break;
+    case 1: {
+        int y;
+        do_stuff();
+        break;
+    }
+    default:
+        do_other_stuff();
+        break;
+    }
+
+Bad example:
+
+    switch (x) {
+        case 0:
+            do_stuff();
+            break;
+        case 1:
+            {
+                int y;
+                do_stuff();
+                break;
+            }
+        default:
+            do_other_stuff();
+            break;
+    }
+
 
 Have fun and happy libssh hacking!