progress/progress.cpp

#include <iostream>
#include <ctime>
#include <cstdlib>
#include <libscterm.hpp>

void show_rows_cols(const sc::term& t) {
    std::cout << t.rows() << " rows, " << t.cols() << " cols\n";
}

void show_progress(const sc::term& t) {
    struct timespec tm;
    tm.tv_nsec = 10000000;
    tm.tv_sec = 0;
    sc::cursor_hider ch {&std::cerr};
    for (int i = 0; i < 1000; ++i) {
        t.progress(12, "progress bar", i, 1000);
        nanosleep(&tm, nullptr);
    }
    std::cerr << sc::io::clear_line(t);
    std::cerr << "progress bar done.";
    std::cerr << std::endl;
}

void show_hue_bar(int top) {
    int r = top;
    int g = 0;
    int b = 0;
    // red -> yellow
    while (g <= top) {
        std::cerr << sc::io::rgbb(r, g++, b) << ' ';
    }
    g = top;
    // yellow -> green
    while (r >= 0) {
        std::cerr << sc::io::rgbb(r--, g, b) << ' ';
    }
    r = 0;
    // green -> cyan
    while (b < top) {
        std::cerr << sc::io::rgbb(r, g, b++) << ' ';
    }
    b = top;
    // cyan -> blue
    while (g >= 0) {
        std::cerr << sc::io::rgbb(r, g--, b) << ' ';
    }
    g = 0;
    // blue -> magenta
    while (r <= top) {
        std::cerr << sc::io::rgbb(r++, g, b) << ' ';
    }
    r = top;
    // magenta -> red
    while (b >= 0) {
        std::cerr << sc::io::rgbb(r, g, b--) << ' ';
    }
    std::cerr << sc::io::reset << std::endl;
}

void show_hue_bars() {
    for (int top = 1; top < 6; ++top) {
        show_hue_bar(top);
    }
}

void show_grayscale_bar() {
    for (int i = 0; i < 23; ++i) {
        std::cerr << sc::io::grayb(i) << ' ';
    }
    std::cerr << sc::io::reset << std::endl;
}

void show_words() {
    std::cout << sc::io::redf << " red ";
    std::cout << sc::io::greenf << " green ";
    std::cout << sc::io::bluef << " blue ";
    std::cout << sc::io::cyanf << " cyan ";
    std::cout << sc::io::magentaf << " magenta ";
    std::cout << sc::io::yellowf << " yellow ";
    std::cout << sc::io::rgbf(5, 2, 0) << " orange ";
    std::cout << sc::io::reset << std::endl;
    std::cout << sc::io::blackf;
    std::cout << sc::io::redb << " red ";
    std::cout << sc::io::greenb << " green ";
    std::cout << sc::io::blueb << " blue ";
    std::cout << sc::io::cyanb << " cyan ";
    std::cout << sc::io::magentab << " magenta ";
    std::cout << sc::io::yellowb << " yellow ";
    std::cout << sc::io::rgbb(5, 2, 0) << " orange ";
    std::cout << sc::io::reset << std::endl;
    std::cout << sc::io::bold;
    std::cout << sc::io::redf << " red ";
    std::cout << sc::io::greenf << " green ";
    std::cout << sc::io::bluef << " blue ";
    std::cout << sc::io::cyanf << " cyan ";
    std::cout << sc::io::magentaf << " magenta ";
    std::cout << sc::io::yellowf << " yellow ";
    std::cout << sc::io::rgbf(5, 2, 0) << " orange ";
    std::cout << sc::io::reset << std::endl;
    std::cout << sc::io::blackf << sc::io::bold;
    std::cout << sc::io::redb << " red ";
    std::cout << sc::io::greenb << " green ";
    std::cout << sc::io::blueb << " blue ";
    std::cout << sc::io::cyanb << " cyan ";
    std::cout << sc::io::magentab << " magenta ";
    std::cout << sc::io::yellowb << " yellow ";
    std::cout << sc::io::rgbb(5, 2, 0) << " orange ";
    std::cout << sc::io::reset << std::endl;
    std::cout << sc::io::bold << "bold " << sc::io::reset;
    std::cout << sc::io::italic << "italic " << sc::io::reset;
    std::cout << sc::io::underline << "underline" << sc::io::reset << ' ';
    std::cout << sc::io::strikethru << "strike thru" << sc::io::reset << ' ';
    std::cout << sc::io::overline << "overline" << sc::io::reset << ' ';
    std::cout << sc::io::reverse << "reverse" << sc::io::reset << ' ';
    std::cout << sc::io::blinkslow << "slow-blink" << sc::io::reset << ' ';
    std::cout << sc::io::blinkfast << "fast-blink" << sc::io::reset;
    std::cout << std::endl;
}

void show_truecolor(const sc::term& t) {
    // check for true color support
    char* support = getenv("COLORTERM");
    if (!support || support[0] == '\0') return;

    const char* lhb = u8"\u2584"; // lower half block
    int inc = 6.0 * t.cols() / 256.0;
    if (inc == 0) inc = 1;
    for (int s = 16; s < 224; s += 32) {
        int r = s;
        int g = 0;
        int b = 0;
        // red -> yellow
        while (g <= s) {
            std::cerr << sc::io::truecolorb(r, g, b) << sc::io::truecolorf(r, 16 + g, b) << lhb;
            g += inc;
        }
        g = s;
        // yellow -> green
        while (r >= 0) {
            std::cerr << sc::io::truecolorb(r, g, b) << sc::io::truecolorf(16 + r, g, b) << lhb;
            r -= inc;
        }
        r = 0;
        // green -> cyan
        while (b < s) {
            std::cerr << sc::io::truecolorb(r, g, b) << sc::io::truecolorf(r, g, 16 + b) << lhb;
            b += inc;
        }
        b = s;
        // cyan -> blue
        while (g >= 0) {
            std::cerr << sc::io::truecolorb(r, g, b) << sc::io::truecolorf(r, 16 + g, b) << lhb;
            g -= inc;
        }
        g = 0;
        // blue -> magenta
        while (r <= s) {
            std::cerr << sc::io::truecolorb(r, g, b) << sc::io::truecolorf(16 + r, g, b) << lhb;
            r += inc;
        }
        r = s;
        // magenta -> red
        while (b >= 0) {
            std::cerr << sc::io::truecolorb(r, g, b) << sc::io::truecolorf(r, g, 16 + b) << lhb;
            b -= inc;
        }
        std::cerr << sc::io::reset << std::endl;
    }
}

int main() {
    try {
        sc::term term {STDERR_FILENO};
        show_rows_cols(term);
        show_grayscale_bar();
        show_hue_bars();
        show_words();
        show_truecolor(term);
        show_progress(term);
    } catch (const std::exception& ex) {
        std::cerr << sc::io::reset << ex.what() << std::endl;
        return EXIT_FAILURE;
    }
    return EXIT_SUCCESS;
}