Coverage decorator (#384)

Add code coverage for colors and decorators.

src/ftxui/screen/color.cpp

@@ -53,12 +53,12 @@ std::string Color::Print(bool is_background_color) const {
       return (is_background_color ? "48;5;"s : "38;5;"s) + std::to_string(red_);
 
     case ColorType::TrueColor:
+    default:
       return (is_background_color ? "48;2;"s : "38;2;"s)  //
              + std::to_string(red_) + ";"                 //
              + std::to_string(green_) + ";"               //
              + std::to_string(blue_);                     //
   }
-  return "";
 }
 
 /// @brief Build a transparent color.
@@ -96,7 +96,7 @@ Color::Color(uint8_t red, uint8_t green, uint8_t blue)
     return;
   }
 
-  // Find the closest coor from the database:
+  // Find the closest Color from the database:
   const int max_distance = 256 * 256 * 3;
   int closest = max_distance;
   int best = 0;

src/ftxui/screen/color_test.cpp

@@ -0,0 +1,47 @@
+#include "ftxui/screen/color.hpp"
+#include <gtest/gtest-message.h>  // for Message
+#include <gtest/gtest-test-part.h>  // for TestPartResult, SuiteApiResolver, TestFactoryImpl
+#include "ftxui/screen/terminal.hpp"
+#include "gtest/gtest_pred_impl.h"  // for EXPECT_EQ, Test, TEST
+
+namespace ftxui {
+
+TEST(ColorTest, PrintTransparent) {
+  Terminal::SetColorSupport(Terminal::Color::TrueColor);
+  EXPECT_EQ(Color().Print(false), "39");
+  EXPECT_EQ(Color().Print(true), "49");
+}
+
+TEST(ColorTest, PrintColor16) {
+  Terminal::SetColorSupport(Terminal::Color::TrueColor);
+  EXPECT_EQ(Color(Color::Red).Print(false), "31");
+  EXPECT_EQ(Color(Color::Red).Print(true), "41");
+}
+
+TEST(ColorTest, PrintColor256) {
+  Terminal::SetColorSupport(Terminal::Color::TrueColor);
+  EXPECT_EQ(Color(Color::DarkRed).Print(false), "38;5;52");
+  EXPECT_EQ(Color(Color::DarkRed).Print(true), "48;5;52");
+}
+
+TEST(ColorTest, PrintTrueCOlor) {
+  Terminal::SetColorSupport(Terminal::Color::TrueColor);
+  EXPECT_EQ(Color::RGB(1,2,3).Print(false), "38;2;1;2;3");
+  EXPECT_EQ(Color::RGB(1,2,3).Print(true), "48;2;1;2;3");
+}
+
+TEST(ColorTest, FallbackTo256) {
+  Terminal::SetColorSupport(Terminal::Color::Palette256);
+  EXPECT_EQ(Color::RGB(1,2,3).Print(false), "38;5;16");
+}
+
+TEST(ColorTest, FallbackTo16) {
+  Terminal::SetColorSupport(Terminal::Color::Palette16);
+  EXPECT_EQ(Color::RGB(1,2,3).Print(false), "30");
+}
+
+}  // namespace ftxui
+
+// Copyright 2022 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.

src/ftxui/screen/terminal.cpp

@@ -19,6 +19,10 @@
 namespace ftxui {
 
 namespace {
+
+bool g_cached = false;
+Terminal::Color g_cached_supported_color;
+
 Dimensions& FallbackSize() {
 #if defined(__EMSCRIPTEN__)
   // This dimension was chosen arbitrarily to be able to display:
@@ -76,7 +80,8 @@ Terminal::Color ComputeColorSupport() {
 
 }  // namespace
 
-Dimensions Terminal::Size() {
+namespace Terminal {
+Dimensions Size() {
 #if defined(__EMSCRIPTEN__)
   // This dimension was chosen arbitrarily to be able to display:
   // https://arthursonzogni.com/FTXUI/examples
@@ -106,20 +111,24 @@ Dimensions Terminal::Size() {
 
 /// @brief Override terminal size in case auto-detection fails
 /// @param fallbackSize Terminal dimensions to fallback to
-void Terminal::SetFallbackSize(const Dimensions& fallbackSize) {
+void SetFallbackSize(const Dimensions& fallbackSize) {
   FallbackSize() = fallbackSize;
 }
 
-Terminal::Color Terminal::ColorSupport() {
-  static bool cached = false;
-  static Terminal::Color cached_supported_color;
-  if (!cached) {
-    cached = true;
-    cached_supported_color = ComputeColorSupport();
+Color ColorSupport() {
+  if (!g_cached) {
+    g_cached = true;
+    g_cached_supported_color = ComputeColorSupport();
   }
-  return cached_supported_color;
+  return g_cached_supported_color;
 }
 
+void SetColorSupport(Color color) {
+  g_cached = true;
+  g_cached_supported_color = color;
+}
+
+}  // namespace Terminal
 }  // namespace ftxui
 
 // Copyright 2020 Arthur Sonzogni. All rights reserved.