clang-format add {} around statement after if() while() for()

Question

I'd like to know if clang-format could be setup to reduce non-compound_statement into { non-compound_statement; } in iteration_statement.

statement
: labeled_statement
| compound_statement
| expression_statement
| selection_statement
| iteration_statement
| jump_statement
;
iteration_statement
: WHILE '(' expression ')' statement
| DO statement WHILE '(' expression ')' ';'
| FOR '(' expression_statement expression_statement ')' statement
| FOR '(' expression_statement expression_statement expression ')' statement
;

Example

Input:

if (exp) foo = 1;

Output:

if (exp) { foo = 1; }

Then the beautifier would indent as needed.

Answer 1

What you want to do is outside of the scope of what clang-format tries to achieve:

• The only lexical elements clang-format should touch are: whitespaces, string-literals and comments. Any other changes ranging from ordering includes to removing superfluous paranthesis are not in the scope of this tool.

Source: http://clang-developers.42468.n3.nabble.com/Design-clang-format-td3980439.html

However clang tidy can, the feature flag is called readability-braces-around-statements.

Source: http://clang.llvm.org/extra/clang-tidy/checks/readability-braces-around-statements.html