Cleanup. (IWYU, clang-tidy, etc...)

include/ftxui/util/ref.hpp

@@ -88,8 +88,6 @@ class ConstStringRef : public ConstRef<std::string> {
   ConstStringRef(const wchar_t* ref)
       : ConstStringRef(to_string(std::wstring(ref))) {}
   ConstStringRef(const char* ref) : ConstStringRef(std::string(ref)) {}
-
-  ConstStringRef& operator=(const ConstStringRef&) = default;
 };
 
 /// @brief An adapter. Reference a list of strings.
@@ -98,6 +96,8 @@ class ConstStringListRef {
   ConstStringListRef() = default;
   ConstStringListRef(const std::vector<std::string>* ref) : ref_(ref) {}
   ConstStringListRef(const std::vector<std::wstring>* ref) : ref_wide_(ref) {}
+  ConstStringListRef(const ConstStringListRef& other) = default;
+  ConstStringListRef& operator=(const ConstStringListRef& other) = default;
 
   size_t size() const {
     if (ref_) {

src/ftxui/component/component_fuzzer.cpp

@@ -95,7 +95,7 @@ MenuEntryOption GeneratorMenuEntryOption(const char* data, size_t size) {
 MenuOption GeneratorMenuOption(const char* data, size_t size) {
   MenuOption option;
   option.underline = GeneratorUnderlineOption(data, size);
-  option.entries = GeneratorMenuEntryOption(data, size);
+  option.entries_option = GeneratorMenuEntryOption(data, size);
   option.direction = static_cast<Direction>(GeneratorInt(data, size) % 4);
   return option;
 }

src/ftxui/component/slider.cpp

@@ -205,7 +205,8 @@ class SliderBase : public ComponentBase {
 
 class SliderWithLabel : public ComponentBase {
  public:
-  SliderWithLabel(ConstStringRef label, Component inner) : label_(label) {
+  SliderWithLabel(ConstStringRef label, Component inner)
+      : label_(std::move(label)) {
     Add(std::move(inner));
     SetActiveChild(ChildAt(0));
   }

src/ftxui/dom/linear_gradient.cpp

@@ -17,7 +17,7 @@ namespace ftxui {
 namespace {
 
 struct LinearGradientNormalized {
-  float angle = 0.f;
+  float angle = 0.F;
   std::vector<Color> colors;
   std::vector<float> positions;  // Sorted.
 };
@@ -27,15 +27,18 @@ LinearGradientNormalized Normalize(LinearGradient gradient) {
   // Handle gradient of size 0.
   if (gradient.stops.empty()) {
     return LinearGradientNormalized{
-        0.f, {Color::Default, Color::Default}, {0.f, 1.f}};
+        0.F,
+        {Color::Default, Color::Default},
+        {0.F, 1.F},
+    };
   }
 
   // Fill in the two extent, if not provided.
   if (!gradient.stops.front().position) {
-    gradient.stops.front().position = 0.f;
+    gradient.stops.front().position = 0.F;
   }
   if (!gradient.stops.back().position) {
-    gradient.stops.back().position = 1.f;
+    gradient.stops.back().position = 1.F;
   }
 
   // Fill in the blank, by interpolating positions.
@@ -67,20 +70,22 @@ LinearGradientNormalized Normalize(LinearGradient gradient) {
   // If we don't being with zero, add a stop at zero.
   if (gradient.stops.front().position != 0) {
     gradient.stops.insert(gradient.stops.begin(),
-                          {gradient.stops.front().color, 0.f});
+                          {gradient.stops.front().color, 0.F});
   }
   // If we don't end with one, add a stop at one.
   if (gradient.stops.back().position != 1) {
-    gradient.stops.push_back({gradient.stops.back().color, 1.f});
+    gradient.stops.push_back({gradient.stops.back().color, 1.F});
   }
 
   // Normalize the angle.
   LinearGradientNormalized normalized;
-  // NOLINTNEXTLINE
+  const float modulo = 360.F;
-  normalized.angle = std::fmod(std::fmod(gradient.angle, 360.f) + 360.f, 360.f);
+  normalized.angle =
-  for (const auto& stop : gradient.stops) {
+      std::fmod(std::fmod(gradient.angle, modulo) + modulo, modulo);
+  for (auto& stop : gradient.stops) {
     normalized.colors.push_back(stop.color);
-    normalized.positions.push_back(stop.position.value());  // NOLINT
+    // NOLINTNEXTLINE
+    normalized.positions.push_back(stop.position.value());
   }
   return normalized;
 }
@@ -90,8 +95,8 @@ Color Interpolate(const LinearGradientNormalized& gradient, float t) {
   size_t i = 1;
   while (true) {
     if (i > gradient.positions.size()) {
-      // NOLINTNEXTLINE
+      const float half = 0.5F;
-      return Color::Interpolate(0.5f, gradient.colors.back(),
+      return Color::Interpolate(half, gradient.colors.back(),
                                 gradient.colors.back());
     }
     if (t <= gradient.positions[i]) {
@@ -122,7 +127,7 @@ class LinearGradientColor : public NodeDecorator {
 
  private:
   void Render(Screen& screen) override {
-    const float degtorad = 0.01745329251f;
+    const float degtorad = 0.01745329251F;
     const float dx = std::cos(gradient_.angle * degtorad);
     const float dy = std::sin(gradient_.angle * degtorad);
 

src/ftxui/screen/color.cpp

@@ -224,11 +224,17 @@ Color Color::Interpolate(float t, const Color& a, const Color& b) {
 
   // Gamma correction:
   // https://en.wikipedia.org/wiki/Gamma_correction
-  constexpr float gamma = 2.2f;
+  auto interp = [](uint8_t a, uint8_t b, float t) {
-  return Color::RGB(
+    constexpr float gamma = 2.2F;
-      uint8_t(pow(pow(a_r, gamma) * (1 - t) + pow(b_r, gamma) * t, 1 / gamma)),
+    const float a_f = powf(a, gamma);
-      uint8_t(pow(pow(a_g, gamma) * (1 - t) + pow(b_g, gamma) * t, 1 / gamma)),
+    const float b_f = powf(b, gamma);
-      uint8_t(pow(pow(a_b, gamma) * (1 - t) + pow(b_b, gamma) * t, 1 / gamma)));
+    const float c_f = a_f * (1.0F - t) +  //
+                      b_f * t;
+    return static_cast<uint8_t>(powf(c_f, 1.F / gamma));
+  };
+  return Color::RGB(interp(a_r, b_r, t),   //
+                    interp(a_g, b_g, t),   //
+                    interp(a_b, b_b, t));  //
 }
 
 inline namespace literals {