cpp-pager/discord repl/main.cpp

#include <algorithm>
#include <fstream>
#include <iostream>
#include <sstream>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <term.h>
#include <termios.h>
#include <unistd.h>
#include <vector>
#include "timercpp.h"

using namespace std;

void beforeExit();
void beforeExit(int i);
void setCursor(int XPos, int YPos);
void getCursor(int* x, int* y);
void hideCursor();
void showCursor();
void clearScreen();
void clearScreen(short width, short height);
void writeAt(int x, int y, char ch);
void printFrame(vector<vector<char>> screen, short width, short height);
void screen_type(vector<vector<char>> &screen, string str, int x, int y, bool vertical);
void eachFrame(vector<vector<char>> &screen, short width, short height);

Timer t = Timer();

int main(int argc, char **argv)
{

    //^C
    signal(SIGINT, beforeExit);
    //abort()
    signal(SIGABRT, beforeExit);
    //sent by "kill" command
    signal(SIGTERM, beforeExit);
    //^Z
    signal(SIGTSTP, beforeExit);
    atexit(beforeExit);

    float framerate = 10.0;
    float frameduration = 1000.0/framerate;

    vector<vector<char>> screen; // WILL ALWAYS BE AT LEAST 1x1

    struct winsize w;
    ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
    // width: w.ws_col
    // height: w.ws_row

    for (int i = 0; i < w.ws_row-1; i++)
        cout << endl;

    hideCursor();

    t.setInterval([&]() {
        ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
        
        if (w.ws_row > 0 && w.ws_col > 0) {

            //fill vector
            screen.resize(w.ws_col);
            for (auto& col : screen)
                col.resize(w.ws_row);

            eachFrame(screen, w.ws_col, w.ws_row);

            printFrame(screen, w.ws_col, w.ws_row);
        }
    }, (int) frameduration);

    while (true);

    return 0;
}

void beforeExit()
{
    //clearScreen();
    setCursor(0,0);
    showCursor();
    t.stop();
    cout << "goodbye" << endl;
    exit(0);
}

void beforeExit(int i)
{
    beforeExit();
}

void setCursor(int XPos, int YPos) {
    printf("\033[%d;%dH",YPos+1,XPos+1);
}
void getCursor(int* x, int* y) {
   printf("\033[6n");
   scanf("\033[%d;%dR", x, y);
}

void hideCursor()
{
    cout << "\e[?25l" << flush;
}

void showCursor()
{
    cout << "\e[?25h" << flush;
}

void writeAt(int x, int y, char ch)
{
    if (ch == 0)
        ch == ' ';
    setCursor(x, y);
    //printf("%s", ch);
    cout << ch << flush;
    fflush(stdout);
}

void clearScreen() {
    struct winsize w;
    ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
    clearScreen(w.ws_col, w.ws_row);
}

void clearScreen(short width, short height)
{
    setCursor(0, 0);
    for (int i = 0; i < height; i++)
        for (int j = 0; j < width; j++)
            writeAt(j, i, ' ');
    setCursor(0, 0);

}

void printFrame(vector<vector<char>> screen, short width, short height)
{
    //print frame
    for (int y = 0; y < height; y++)
    {
        for (int x = 0; x < width; x++)
            //cout << screen.at(x).at(y);
            writeAt(x, y, screen.at(x).at(y));
        //cout << endl;
    }
    setCursor(0,0);
    /*for (auto& col : screen) {
        for (auto& ch : col)
            cout << ch;
        cout << endl;
    }*/
    //cout << endl;
}

void screen_type(vector<vector<char>> &screen, string str, int x, int y, bool vertical)
{

    int width = 0,
        height = 0;

    if (str.length()) {

        //str.append("\033[0m");

        width = 1;
        height = 1;

        if (vertical)
            height = str.length();
        else
            width = str.length();

        width = min(width, (int) screen.size() - x);
        height = min(height, (int) screen.at(0).size() - y);

    }

    for (int i = x, ii = 0, d = 0; ii < width; i++, ii++)
        for (int j = y, jj = 0; jj < height; j++, jj++, d++) {
            //cout << str.at(d) << " " << i << "," << j << endl;
            screen.at(i).at(j) = str.at(d);
        }
}

void eachFrame(vector<vector<char>> &screen, short width, short height)
{
    
    stringstream ss;

    ss << width << "x" << height;
    //ss << "Hello World.";

    screen_type(screen, ss.str(), 10, 10, false);

}