c++clangclang-format

Can clang-format add braces to single-line if statements, etc?

Is there an option for clang-format to add braces to all if/do/while statements, etc?

e.g.,

if( i == 42 )
   std::cout << "You found the meaning of life\n";
else
   std::cout << "Wrong!\n";

to

if( i == 42 )
{
   std::cout << "You found the meaning of life\n";
}
else
{
   std::cout << "Wrong!\n";
}

Using

$ clang-format --version
clang-format version 3.6.0
Solution

  • clang-tidy can make syntactic changes to your code using FIXITS

    clang-tidy YOUR_FILE.cpp -fix -checks="readability-braces-around-statements" -- COMPILE_OPTIONS

    Updated:

    clang-tidy is a bit of a heavyweight tool for this as it needs compile options to parse the file, sadly clang-format (as of v3.9) won't add braces.

    COMPILE_OPTIONS would be the include paths etc that you use to compile the file with, ie -std=c++14 -stdlib=libc++ -O2 -I.

    If you have a compile_options.json file from CMake then you can pass the path of the directory it is contained in to clang-tidy and it will look up the appropriate compile options for the file:

    clang-tidy YOUR_FILE.cpp -fix -checks="readability-braces-around-statements" -p COMPILE_OPTIONS_DIR