Can clang format add braces to single line if statements etc

Question

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

eg

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

Comments

[Novice C]

Is it possible to run this without making a compilation database? Say I purely only wanted to run the readability check, without looking for compile errors. I ask because I want to edit individual files independent of the entire project. When I try to do this I get Error while trying to load a compilation database and Running without flags. Which I think is to say that it ignores the readability check, since it does not add the braces as I'd wished.

[Novice C]

To give a concrete example, say my file has #include "../header.h" but I am editing the file in a directory with no header.h in the parent directory. Is it possible to still use clang-tidy in this scenario?

[jbcoe]

I've updated my answer with extra info as it won't neatly fit in a comment.

[jbcoe]

I'm not sure I can think of compiler flags that would get your particular example, with a file referenced by a relative include, working.

[Droopycom]

clang-tidy is just really a front-end for the static analyzer. It really needs to be part of your build process.

[Tyler Shellberg]

@jbcoe Checking in, as of version clang-format 7.0, is it still impossible for it to add braces?

[dovedevic]

@TylerShellberg Have you found anything out about this?