Refactor clang-tidy (#389)

* Make CI fail with readability-container-size-empty flag

* Make CI fail with cppcoreguidelines-owning-memory flag

* Add all google checks, exclude specific ones

* Apply clang-tidy fixes

* Make timer constructors explicit

* Add check for unscoped namespaces

* Replace unscoped namespace by using-declaration

* Replace unscoped namespace by using-declaration

.clang-tidy

@@ -1,8 +1,35 @@
-#Checks: '*,-clang-analyzer-alpha.*'
+# Checks that will be implemented in future PRs:
-#Checks: '-*,google-readability-casting,llvm-namespace-comment,performance-unnecessary-value-param,llvm-include-order,misc-throw-by-value-catch-by-reference,readability-container-size-empty,google-runtime-references,modernize*'
+# performance-unnecessary-value-param, hints to ~110 issues. Be careful with implementing the suggested changes of this one, as auto-fixes may break the code
-Checks: '-*,llvm-namespace-comment,readability-container-size-empty,misc-throw-by-value-catch-by-reference,modernize*,google-readability-casting'
+
-HeaderFilterRegex: '.*hpp'
+FormatStyle: file
-CheckOptions:
+
-- key:             readability-braces-around-statements.ShortStatementLines
+Checks: '
-  value:           '1'
+-*,
+google-*,
+-google-runtime-int,
+-google-runtime-references,
+llvm-include-order,
+llvm-namespace-comment,
+misc-throw-by-value-catch-by-reference,
+modernize*,
+readability-container-size-empty,
+'
+
+WarningsAsErrors: '
+-*,
+google-*,
+-google-runtime-int,
+-google-runtime-references,
+llvm-include-order,
+llvm-namespace-comment,
+misc-throw-by-value-catch-by-reference,
+modernize*,
+readability-container-size-empty,
+'
+
+HeaderFilterRegex: '.*hpp'
+
+CheckOptions:
+- key:             google-readability-braces-around-statements.ShortStatementLines
+  value:           '3'
 

examples/enum.cpp

@@ -18,7 +18,7 @@ int main(int argc, char **argv) {
     CLI11_PARSE(app, argc, argv);
 
     // CLI11's built in enum streaming can be used outside CLI11 like this:
-    using namespace CLI::enums;
+    using CLI::enums::operator<<;
     std::cout << "Enum received: " << level << std::endl;
 
     return 0;

examples/enum_ostream.cpp

@@ -34,7 +34,7 @@ int main(int argc, char **argv) {
     CLI11_PARSE(app, argc, argv);
 
     // CLI11's built in enum streaming can be used outside CLI11 like this:
-    using namespace CLI::enums;
+    using CLI::enums::operator<<;
     std::cout << "Enum received: " << level << std::endl;
 
     return 0;

include/CLI/App.hpp

@@ -2416,10 +2416,11 @@ class App {
 
     /// Count the required remaining positional arguments
     bool _has_remaining_positionals() const {
-        for(const Option_p &opt : options_)
+        for(const Option_p &opt : options_) {
             if(opt->get_positional() && ((static_cast<int>(opt->count()) < opt->get_items_expected_min()))) {
                 return true;
             }
+        }
 
         return false;
     }

include/CLI/Config.hpp

@@ -314,7 +314,7 @@ ConfigBase::to_config(const App *app, bool default_also, bool write_description,
         }
     }
 
-    for(const App *subcom : subcommands)
+    for(const App *subcom : subcommands) {
         if(!subcom->get_name().empty()) {
             if(subcom->get_configurable() && app->got_subcommand(subcom)) {
                 if(!prefix.empty() || app->get_parent() == nullptr) {
@@ -333,6 +333,7 @@ ConfigBase::to_config(const App *app, bool default_also, bool write_description,
                 out << to_config(subcom, default_also, write_description, prefix + subcom->get_name() + ".");
             }
         }
+    }
 
     return out.str();
 }

include/CLI/Error.hpp

@@ -216,16 +216,18 @@ class RequiredError : public ParseError {
     Option(std::size_t min_option, std::size_t max_option, std::size_t used, const std::string &option_list) {
         if((min_option == 1) && (max_option == 1) && (used == 0))
             return RequiredError("Exactly 1 option from [" + option_list + "]");
-        if((min_option == 1) && (max_option == 1) && (used > 1))
+        if((min_option == 1) && (max_option == 1) && (used > 1)) {
             return RequiredError("Exactly 1 option from [" + option_list + "] is required and " + std::to_string(used) +
                                      " were given",
                                  ExitCodes::RequiredError);
+        }
         if((min_option == 1) && (used == 0))
             return RequiredError("At least 1 option from [" + option_list + "]");
-        if(used < min_option)
+        if(used < min_option) {
             return RequiredError("Requires at least " + std::to_string(min_option) + " options used and only " +
                                      std::to_string(used) + "were given from [" + option_list + "]",
                                  ExitCodes::RequiredError);
+        }
         if(max_option == 1)
             return RequiredError("Requires at most 1 options be given from [" + option_list + "]",
                                  ExitCodes::RequiredError);

include/CLI/StringTools.hpp

@@ -28,7 +28,7 @@ std::ostream &operator<<(std::ostream &in, const T &item) {
 } // namespace enums
 
 /// Export to CLI namespace
-using namespace enums;
+using enums::operator<<;
 
 namespace detail {
 /// a constant defining an expected max vector size defined to be a big number that could be multiplied by 4 and not

include/CLI/Timer.hpp

@@ -54,7 +54,7 @@ class Timer {
 
   public:
     /// Standard constructor, can set title and print function
-    Timer(std::string title = "Timer", time_print_t time_print = Simple)
+    explicit Timer(std::string title = "Timer", time_print_t time_print = Simple)
         : title_(std::move(title)), time_print_(std::move(time_print)), start_(clock::now()) {}
 
     /// Time a function by running it multiple times. Target time is the len to target.
@@ -117,7 +117,7 @@ class Timer {
 class AutoTimer : public Timer {
   public:
     /// Reimplementing the constructor is required in GCC 4.7
-    AutoTimer(std::string title = "Timer", time_print_t time_print = Simple) : Timer(title, time_print) {}
+    explicit AutoTimer(std::string title = "Timer", time_print_t time_print = Simple) : Timer(title, time_print) {}
     // GCC 4.7 does not support using inheriting constructors.
 
     /// This destructor prints the string