njlr

counting from 1 to 10: i=1 [#_________]
counting from 1 to 10: i=2 [##________]
counting from 1 to 10: i=3 [###_______]
counting from 1 to 10: i=4 [####______]
counting from 1 to 10: i=5 [#####_____]

njlr

unsigned const terminalWidth = 80;

int main() {
  VirtualTerminal vt;

  auto const fancyCounter = [](auto start, auto end, auto i) -> FlowLayout<> {
    return {
      Text("counting from "), Text({ Font::Bold }, start), 
      Text(" to "), Text({ Font::Bold }, end),
      Text(": i="), Text({ FgColor::Red, Font::Underline }, i) 

njlr

#include <iostream>

int main() {
  std::cout << "\e[31m" << "Hello" << "\e[0m" << World" << std::endl;
  return 0;
}

njlr

enum class Color { /* ... */ };
enum class Font { /* ... */ };

struct Style {
  Color bg;
  Color fg;
  Font font;
};

struct Pixel {

njlr

struct Renderable {
  virtual Image render(unsigned const width) const = 0;
  virtual ~Renderable() {}
};

template<class T>
struct Model : Renderable {
  
  T data;
  

njlr

struct Text {
  Style style; 
  std::string text;
  
  Image render() const {
    std::vector<Pixel> pixels(text.size(), Pixel{ style });
    for (int i = 0; i < text.size(); ++i) {
      pixels[i].c = text[i]; 
    }
    return Image{ width, height, pixels };

njlr

running task: download
progress(50%): [xxxxxx ]
Tasks Done: 1/5: [x ]

njlr

running task: download
progress(75%): [xxxxxxxxx ]
Tasks Done: 1/5: [x ]

njlr

// Pseudo-code
struct VirtualTerminal {
  string buffer; // Currently visible output
 
  string computeTransition(string const& prev, string const& next) {
    const string deleteLine = "\e[2K\r\e[1A";
    return repeat(count("\n", prev), deleteLine()) + next;
  }
 
  VirtualTerminal flip(std::string const& str) const {

njlr

int f() {
  Foo foo = new Foo();
  return foo.bar();
}