inline args_t load_compilation_database(std::string const &file, fs::path filename)
{
static const std::string source_extensions[] {".c", ".cpp", ".cc"};
static const std::string header_extensions[] {".h", ".hpp", ".hh"};
std::string error;
#if LLVM_VERSION_MAJOR >= 4
auto const database_ptr
(
::clang::tooling::JSONCompilationDatabase::loadFromFile
(
file,
error,
::clang::tooling::JSONCommandLineSyntax::Gnu
)
);
#else
auto const database_ptr
(
::clang::tooling::JSONCompilationDatabase::loadFromFile
(
file,
error
)
);
#endif
if(!database_ptr)
{
core::last_error(error);
return {};
}
std::vector<fs::path> files{filename};
auto const ext(filename.extension());
if(std::find(begin(header_extensions), end(header_extensions), ext) != end(header_extensions))
{
auto path = filename.string();
auto const include_it = path.rfind("include");
if(include_it != std::string::npos)
{
filename = path.replace(include_it, 7, "src");
}
for(auto const &extension : source_extensions)
{
files.emplace_back(filename.replace_extension(extension));
}
}
std::vector<::clang::tooling::CompileCommand> compile_commands;
for(auto const &file : files)
{
compile_commands = database_ptr->getCompileCommands(file.string());
if(!compile_commands.empty())
{
filename = file;
break;
}
}
if(compile_commands.empty())
{ return {}; }
// Skip argv[0] which is the name of the clang executable.
args_t commands((compile_commands[0].CommandLine.begin() + 1), compile_commands[0].CommandLine.end());
// Get rid of the source filename itself.
// NOTE: '-o <output>' and '-c' will be automatically ignored by libclang.
commands.erase(std::remove(commands.begin(), commands.end(), filename), commands.end());
commands.erase(std::remove(commands.begin(), commands.end(), compile_commands[0].Filename), commands.end());
return commands;
}
